xref: /dports/www/moodle310/moodle/message/amd/build/message_drawer_view_conversation.min.js.map

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This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Controls the conversation page in the message drawer.\n *\n * This function handles all of the user actions that the user can take\n * when interacting with the conversation page.\n *\n * It maintains a view state which is a data representation of the view\n * and only operates on that data.\n *\n * The view state is immutable and should never be modified directly. Instead\n * all changes to the view state should be done using the StateManager which\n * will generate a new version of the view state with the requested changes.\n *\n * After any changes to the view state the module will call the render function\n * to ask the renderer to update the UI.\n *\n * General rules for this module:\n * 1.) Never modify viewState directly. All changes should be via the StateManager.\n * 2.) Call render() with the new state when you want to update the UI\n * 3.) Never modify the UI directly in this module. This module is only concerned\n *     with the data in the view state.\n *\n * The general flow for a user interaction will be something like:\n * User interaction: User clicks \"confirm block\" button to block the other user\n *      1.) This module is hears the click\n *      2.) This module sends a request to the server to block the user\n *      3.) The server responds with the new user profile\n *      4.) This module generates a new state using the StateManager with the updated\n *          user profile.\n *      5.) This module asks the Patcher to generate a patch from the current state and\n *          the newly generated state. This patch tells the renderer what has changed\n *          between the states.\n *      6.) This module gives the Renderer the generated patch. The renderer updates\n *          the UI with changes according to the patch.\n *\n * @module     core_message/message_drawer_view_conversation\n * @copyright  2018 Ryan Wyllie <ryan@moodle.com>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine(\n[\n    'jquery',\n    'core/auto_rows',\n    'core/backoff_timer',\n    'core/custom_interaction_events',\n    'core/notification',\n    'core/pending',\n    'core/pubsub',\n    'core/str',\n    'core_message/message_repository',\n    'core_message/message_drawer_events',\n    'core_message/message_drawer_view_conversation_constants',\n    'core_message/message_drawer_view_conversation_patcher',\n    'core_message/message_drawer_view_conversation_renderer',\n    'core_message/message_drawer_view_conversation_state_manager',\n    'core_message/message_drawer_router',\n    'core_message/message_drawer_routes',\n    'core/emoji/auto_complete',\n    'core/emoji/picker'\n],\nfunction(\n    $,\n    AutoRows,\n    BackOffTimer,\n    CustomEvents,\n    Notification,\n    Pending,\n    PubSub,\n    Str,\n    Repository,\n    MessageDrawerEvents,\n    Constants,\n    Patcher,\n    Renderer,\n    StateManager,\n    MessageDrawerRouter,\n    MessageDrawerRoutes,\n    initialiseEmojiAutoComplete,\n    initialiseEmojiPicker\n) {\n\n    // Contains a cache of all view states that have been loaded so far\n    // which saves us having to reload stuff with network requests when\n    // switching between conversations.\n    var stateCache = {};\n    // The current data representation of the view.\n    var viewState = null;\n    var loadedAllMessages = false;\n    var messagesOffset = 0;\n    var newMessagesPollTimer = null;\n    var isRendering = false;\n    var renderBuffer = [];\n    // If the UI is currently resetting.\n    var isResetting = true;\n    // If the UI is currently sending a message.\n    var isSendingMessage = false;\n    // If the UI is currently deleting a conversation.\n    var isDeletingConversationContent = false;\n    // A buffer of messages to send.\n    var sendMessageBuffer = [];\n    // These functions which will be generated when this module is\n    // first called. See generateRenderFunction for details.\n    var render = null;\n    // The list of renderers that have been registered to render\n    // this conversation. See generateRenderFunction for details.\n    var renderers = [];\n\n    var NEWEST_FIRST = Constants.NEWEST_MESSAGES_FIRST;\n    var LOAD_MESSAGE_LIMIT = Constants.LOAD_MESSAGE_LIMIT;\n    var MILLISECONDS_IN_SEC = Constants.MILLISECONDS_IN_SEC;\n    var SELECTORS = Constants.SELECTORS;\n    var CONVERSATION_TYPES = Constants.CONVERSATION_TYPES;\n\n    /**\n     * Get the other user userid.\n     *\n     * @return {Number} Userid.\n     */\n    var getOtherUserId = function() {\n        if (!viewState || viewState.type == CONVERSATION_TYPES.PUBLIC) {\n            return null;\n        }\n\n        var loggedInUserId = viewState.loggedInUserId;\n        if (viewState.type == CONVERSATION_TYPES.SELF) {\n            // It's a self-conversation, so the other user is the one logged in.\n            return loggedInUserId;\n        }\n\n        var otherUserIds = Object.keys(viewState.members).filter(function(userId) {\n            return loggedInUserId != userId;\n        });\n\n        return otherUserIds.length ? otherUserIds[0] : null;\n    };\n\n    /**\n     * Search the cache to see if we've already loaded a private conversation\n     * with the given user id.\n     *\n     * @param {Number} userId The id of the other user.\n     * @return {Number|null} Conversation id.\n     */\n    var getCachedPrivateConversationIdFromUserId = function(userId) {\n        return Object.keys(stateCache).reduce(function(carry, id) {\n            if (!carry) {\n                var state = stateCache[id].state;\n\n                if (state.type != CONVERSATION_TYPES.PUBLIC) {\n                    if (userId in state.members) {\n                        // We've found a cached conversation for this user!\n                        carry = state.id;\n                    }\n                }\n            }\n\n            return carry;\n        }, null);\n    };\n\n    /**\n     * Get profile info for logged in user.\n     *\n     * @param {Object} body Conversation body container element.\n     * @return {Object}\n     */\n    var getLoggedInUserProfile = function(body) {\n        return {\n            id: parseInt(body.attr('data-user-id'), 10),\n            fullname: null,\n            profileimageurl: null,\n            profileimageurlsmall: null,\n            isonline:  null,\n            showonlinestatus: null,\n            isblocked: null,\n            iscontact: null,\n            isdeleted: null,\n            canmessage: null,\n            canmessageevenifblocked: null,\n            requirescontact: null,\n            contactrequests: []\n        };\n    };\n\n    /**\n     * Get the messages offset value to load more messages.\n     *\n     * @return {Number}\n     */\n    var getMessagesOffset = function() {\n        return messagesOffset;\n    };\n\n    /**\n     * Set the messages offset value for loading more messages.\n     *\n     * @param {Number} value The offset value\n     */\n    var setMessagesOffset = function(value) {\n        messagesOffset = value;\n        stateCache[viewState.id].messagesOffset = value;\n    };\n\n    /**\n     * Check if all messages have been loaded.\n     *\n     * @return {Bool}\n     */\n    var hasLoadedAllMessages = function() {\n        return loadedAllMessages;\n    };\n\n    /**\n     * Set whether all messages have been loaded or not.\n     *\n     * @param {Bool} value If all messages have been loaded.\n     */\n    var setLoadedAllMessages = function(value) {\n        loadedAllMessages = value;\n        stateCache[viewState.id].loadedAllMessages = value;\n    };\n\n    /**\n     * Get the messages container element.\n     *\n     * @param  {Object} body Conversation body container element.\n     * @return {Object} The messages container element.\n     */\n    var getMessagesContainer = function(body) {\n        return body.find(SELECTORS.MESSAGES_CONTAINER);\n    };\n\n    /**\n     * Reformat the conversation for an event payload.\n     *\n     * @param  {Object} state The view state.\n     * @return {Object} New formatted conversation.\n     */\n    var formatConversationForEvent = function(state) {\n        return {\n            id: state.id,\n            name: state.name,\n            subname: state.subname,\n            imageUrl: state.imageUrl,\n            isFavourite: state.isFavourite,\n            isMuted: state.isMuted,\n            type: state.type,\n            totalMemberCount: state.totalMemberCount,\n            loggedInUserId: state.loggedInUserId,\n            messages: state.messages.map(function(message) {\n                return $.extend({}, message);\n            }),\n            members: Object.keys(state.members).map(function(id) {\n                var formattedMember = $.extend({}, state.members[id]);\n                formattedMember.contactrequests = state.members[id].contactrequests.map(function(request) {\n                    return $.extend({}, request);\n                });\n                return formattedMember;\n            })\n        };\n    };\n\n    /**\n     * Load up an empty private conversation between the logged in user and the\n     * other user. Sets all of the conversation details based on the other user.\n     *\n     * A conversation isn't created until the user sends the first message.\n     *\n     * @param  {Object} loggedInUserProfile The logged in user profile.\n     * @param  {Number} otherUserId The other user id.\n     * @return {Object} Profile returned from repository.\n     */\n    var loadEmptyPrivateConversation = function(loggedInUserProfile, otherUserId) {\n        var loggedInUserId = loggedInUserProfile.id;\n        // If the other user id is the same as the logged in user then this is a self\n        // conversation.\n        var conversationType = loggedInUserId == otherUserId ? CONVERSATION_TYPES.SELF : CONVERSATION_TYPES.PRIVATE;\n        var newState = StateManager.setLoadingMembers(viewState, true);\n        newState = StateManager.setLoadingMessages(newState, true);\n        render(newState);\n\n        return Repository.getMemberInfo(loggedInUserId, [otherUserId], true, true)\n            .then(function(profiles) {\n                if (profiles.length) {\n                    return profiles[0];\n                } else {\n                    throw new Error('Unable to load other user profile');\n                }\n            })\n            .then(function(profile) {\n                // If the conversation is a self conversation then the profile loaded is the\n                // logged in user so only add that to the members array.\n                var members = conversationType == CONVERSATION_TYPES.SELF ? [profile] : [profile, loggedInUserProfile];\n                var newState = StateManager.addMembers(viewState, members);\n                newState = StateManager.setLoadingMembers(newState, false);\n                newState = StateManager.setLoadingMessages(newState, false);\n                newState = StateManager.setName(newState, profile.fullname);\n                newState = StateManager.setType(newState, conversationType);\n                newState = StateManager.setImageUrl(newState, profile.profileimageurl);\n                newState = StateManager.setTotalMemberCount(newState, members.length);\n                render(newState);\n                return profile;\n            })\n            .catch(function(error) {\n                var newState = StateManager.setLoadingMembers(viewState, false);\n                render(newState);\n                Notification.exception(error);\n            });\n    };\n\n    /**\n     * Create a new state from a conversation object.\n     *\n     * @param {Object} conversation The conversation object.\n     * @param {Number} loggedInUserId The logged in user id.\n     * @return {Object} new state.\n     */\n    var updateStateFromConversation = function(conversation, loggedInUserId) {\n        var otherUser = null;\n        if (conversation.type == CONVERSATION_TYPES.PRIVATE) {\n            // For private conversations, remove current logged in user from the members list to get the other user.\n            var otherUsers = conversation.members.filter(function(member) {\n                return member.id != loggedInUserId;\n            });\n            otherUser = otherUsers.length ? otherUsers[0] : null;\n        } else if (conversation.type == CONVERSATION_TYPES.SELF) {\n            // Self-conversations have only one member.\n            otherUser = conversation.members[0];\n        }\n\n        var name = conversation.name;\n        var imageUrl = conversation.imageurl;\n\n        if (conversation.type != CONVERSATION_TYPES.PUBLIC) {\n            name = name || otherUser ? otherUser.fullname : '';\n            imageUrl = imageUrl || otherUser ? otherUser.profileimageurl : '';\n        }\n\n        var newState = StateManager.addMembers(viewState, conversation.members);\n        newState = StateManager.setName(newState, name);\n        newState = StateManager.setSubname(newState, conversation.subname);\n        newState = StateManager.setType(newState, conversation.type);\n        newState = StateManager.setImageUrl(newState, imageUrl);\n        newState = StateManager.setTotalMemberCount(newState, conversation.membercount);\n        newState = StateManager.setIsFavourite(newState, conversation.isfavourite);\n        newState = StateManager.setIsMuted(newState, conversation.ismuted);\n        newState = StateManager.addMessages(newState, conversation.messages);\n        newState = StateManager.setCanDeleteMessagesForAllUsers(newState, conversation.candeletemessagesforallusers);\n        return newState;\n    };\n\n    /**\n     * Get the details for a conversation from the conversation id.\n     *\n     * @param  {Number} conversationId The conversation id.\n     * @param  {Object} loggedInUserProfile The logged in user profile.\n     * @param  {Number} messageLimit The number of messages to include.\n     * @param  {Number} messageOffset The number of messages to skip.\n     * @param  {Bool} newestFirst Order messages newest first.\n     * @return {Object} Promise resolved when loaded.\n     */\n    var loadNewConversation = function(\n        conversationId,\n        loggedInUserProfile,\n        messageLimit,\n        messageOffset,\n        newestFirst\n    ) {\n        var loggedInUserId = loggedInUserProfile.id;\n        var newState = StateManager.setLoadingMembers(viewState, true);\n        newState = StateManager.setLoadingMessages(newState, true);\n        render(newState);\n\n        return Repository.getConversation(\n            loggedInUserId,\n            conversationId,\n            true,\n            true,\n            0,\n            0,\n            messageLimit + 1,\n            messageOffset,\n            newestFirst\n        )\n            .then(function(conversation) {\n                if (conversation.messages.length > messageLimit) {\n                    conversation.messages = conversation.messages.slice(1);\n                } else {\n                    setLoadedAllMessages(true);\n                }\n\n                setMessagesOffset(messageOffset + messageLimit);\n\n                return conversation;\n            })\n            .then(function(conversation) {\n                var hasLoggedInUser = conversation.members.filter(function(member) {\n                    return member.id == loggedInUserProfile.id;\n                });\n\n                if (hasLoggedInUser.length < 1) {\n                    conversation.members = conversation.members.concat([loggedInUserProfile]);\n                }\n\n                var newState = updateStateFromConversation(conversation, loggedInUserProfile.id);\n                newState = StateManager.setLoadingMembers(newState, false);\n                newState = StateManager.setLoadingMessages(newState, false);\n                return render(newState)\n                    .then(function() {\n                        return conversation;\n                    });\n            })\n            .then(function() {\n                return markConversationAsRead(conversationId);\n            })\n            .catch(function(error) {\n                var newState = StateManager.setLoadingMembers(viewState, false);\n                newState = StateManager.setLoadingMessages(newState, false);\n                render(newState);\n                Notification.exception(error);\n            });\n    };\n\n    /**\n     * Get the details for a conversation from and existing conversation object.\n     *\n     * @param  {Object} conversation The conversation object.\n     * @param  {Object} loggedInUserProfile The logged in user profile.\n     * @param  {Number} messageLimit The number of messages to include.\n     * @param  {Bool} newestFirst Order messages newest first.\n     * @return {Object} Promise resolved when loaded.\n     */\n    var loadExistingConversation = function(\n        conversation,\n        loggedInUserProfile,\n        messageLimit,\n        newestFirst\n    ) {\n        var hasLoggedInUser = conversation.members.filter(function(member) {\n            return member.id == loggedInUserProfile.id;\n        });\n\n        if (hasLoggedInUser.length < 1) {\n            conversation.members = conversation.members.concat([loggedInUserProfile]);\n        }\n\n        var messageCount = conversation.messages.length;\n        var hasLoadedEnoughMessages = messageCount >= messageLimit;\n        var newState = updateStateFromConversation(conversation, loggedInUserProfile.id);\n        newState = StateManager.setLoadingMembers(newState, false);\n        newState = StateManager.setLoadingMessages(newState, !hasLoadedEnoughMessages);\n        var renderPromise = render(newState);\n\n        return renderPromise.then(function() {\n                if (!hasLoadedEnoughMessages) {\n                    // We haven't got enough messages so let's load some more.\n                    return loadMessages(conversation.id, messageLimit, messageCount, newestFirst, []);\n                } else {\n                    // We've got enough messages. No need to load any more for now.\n                    return {messages: conversation.messages};\n                }\n            })\n            .then(function() {\n                var messages = viewState.messages;\n                // Update the offset to reflect the number of messages we've loaded.\n                setMessagesOffset(messages.length);\n                markConversationAsRead(viewState.id);\n\n                return messages;\n            })\n            .catch(Notification.exception);\n    };\n\n    /**\n     * Load messages for this conversation and pass them to the renderer.\n     *\n     * @param  {Number} conversationId Conversation id.\n     * @param  {Number} limit Number of messages to load.\n     * @param  {Number} offset Get messages from offset.\n     * @param  {Bool} newestFirst Get newest messages first.\n     * @param  {Array} ignoreList Ignore any messages with ids in this list.\n     * @param  {Number|null} timeFrom Only get messages from this time onwards.\n     * @return {Promise} renderer promise.\n     */\n    var loadMessages = function(conversationId, limit, offset, newestFirst, ignoreList, timeFrom) {\n        return Repository.getMessages(\n                viewState.loggedInUserId,\n                conversationId,\n                limit ? limit + 1 : limit,\n                offset,\n                newestFirst,\n                timeFrom\n            )\n            .then(function(result) {\n                // Prevent older requests from contaminating the current view.\n                if (result.id != viewState.id) {\n                    result.messages = [];\n                    // Purge old conversation cache to prevent messages lose.\n                    if (result.id in stateCache) {\n                        delete stateCache[result.id];\n                    }\n                }\n\n                return result;\n            })\n            .then(function(result) {\n                if (result.messages.length && ignoreList.length) {\n                    result.messages = result.messages.filter(function(message) {\n                        // Skip any messages in our ignore list.\n                        return ignoreList.indexOf(parseInt(message.id, 10)) < 0;\n                    });\n                }\n\n                return result;\n            })\n            .then(function(result) {\n                if (!limit) {\n                    return result;\n                } else if (result.messages.length > limit) {\n                    // Ignore the last result which was just to test if there are more\n                    // to load.\n                    result.messages = result.messages.slice(0, -1);\n                } else {\n                    setLoadedAllMessages(true);\n                }\n\n                return result;\n            })\n            .then(function(result) {\n                var membersToAdd = result.members.filter(function(member) {\n                    return !(member.id in viewState.members);\n                });\n                var newState = StateManager.addMembers(viewState, membersToAdd);\n                newState = StateManager.addMessages(newState, result.messages);\n                newState = StateManager.setLoadingMessages(newState, false);\n                return render(newState)\n                    .then(function() {\n                        return result;\n                    });\n            })\n            .catch(function(error) {\n                var newState = StateManager.setLoadingMessages(viewState, false);\n                render(newState);\n                // Re-throw the error for other error handlers.\n                throw error;\n            });\n    };\n\n    /**\n     * Create a callback function for getting new messages for this conversation.\n     *\n     * @param  {Number} conversationId Conversation id.\n     * @param  {Bool} newestFirst Show newest messages first\n     * @return {Function} Callback function that returns a renderer promise.\n     */\n    var getLoadNewMessagesCallback = function(conversationId, newestFirst) {\n        return function() {\n            var messages = viewState.messages;\n            var mostRecentMessage = messages.length ? messages[messages.length - 1] : null;\n            var lastTimeCreated = mostRecentMessage ? mostRecentMessage.timeCreated : null;\n\n            if (lastTimeCreated && !isResetting && !isSendingMessage && !isDeletingConversationContent) {\n                // There may be multiple messages with the same time created value since\n                // the accuracy is only down to the second. The server will include these\n                // messages in the result (since it does a >= comparison on time from) so\n                // we need to filter them back out of the result so that we're left only\n                // with the new messages.\n                var ignoreMessageIds = [];\n                for (var i = messages.length - 1; i >= 0; i--) {\n                    var message = messages[i];\n                    if (message.timeCreated === lastTimeCreated) {\n                        ignoreMessageIds.push(message.id);\n                    } else {\n                        // Since the messages are ordered in ascending order of time created\n                        // we can break as soon as we hit a message with a different time created\n                        // because we know all other messages will have lower values.\n                        break;\n                    }\n                }\n\n                return loadMessages(\n                        conversationId,\n                        0,\n                        0,\n                        newestFirst,\n                        ignoreMessageIds,\n                        lastTimeCreated\n                    )\n                    .then(function(result) {\n                        if (result.messages.length) {\n                            // If we found some results then restart the polling timer\n                            // because the other user might be sending messages.\n                            newMessagesPollTimer.restart();\n                            // We've also got a new last message so publish that for other\n                            // components to update.\n                            var conversation = formatConversationForEvent(viewState);\n                            PubSub.publish(MessageDrawerEvents.CONVERSATION_NEW_LAST_MESSAGE, conversation);\n                            return markConversationAsRead(conversationId);\n                        } else {\n                            return result;\n                        }\n                    });\n            }\n\n            return $.Deferred().resolve().promise();\n        };\n    };\n\n    /**\n     * Mark a conversation as read.\n     *\n     * @param  {Number} conversationId The conversation id.\n     * @return {Promise} The renderer promise.\n     */\n    var markConversationAsRead = function(conversationId) {\n        var loggedInUserId = viewState.loggedInUserId;\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:markConversationAsRead');\n\n        return Repository.markAllConversationMessagesAsRead(loggedInUserId, conversationId)\n            .then(function() {\n                var newState = StateManager.markMessagesAsRead(viewState, viewState.messages);\n                PubSub.publish(MessageDrawerEvents.CONVERSATION_READ, conversationId);\n                return render(newState);\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Tell the statemanager there is request to block a user and run the renderer\n     * to show the block user dialogue.\n     *\n     * @param {Number} userId User id.\n     */\n    var requestBlockUser = function(userId) {\n        cancelRequest(userId);\n        var newState = StateManager.addPendingBlockUsersById(viewState, [userId]);\n        render(newState);\n    };\n\n    /**\n     * Send the repository a request to block a user, update the statemanager and publish\n     * a contact has been blocked.\n     *\n     * @param  {Number} userId User id of user to block.\n     * @return {Promise} Renderer promise.\n     */\n    var blockUser = function(userId) {\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:blockUser');\n\n        render(newState);\n\n        return Repository.blockUser(viewState.loggedInUserId, userId)\n            .then(function(profile) {\n                var newState = StateManager.addMembers(viewState, [profile]);\n                newState = StateManager.removePendingBlockUsersById(newState, [userId]);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                PubSub.publish(MessageDrawerEvents.CONTACT_BLOCKED, userId);\n                return render(newState);\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Tell the statemanager there is a request to unblock a user and run the renderer\n     * to show the unblock user dialogue.\n     *\n     * @param {Number} userId User id of user to unblock.\n     */\n    var requestUnblockUser = function(userId) {\n        cancelRequest(userId);\n        var newState = StateManager.addPendingUnblockUsersById(viewState, [userId]);\n        render(newState);\n    };\n\n    /**\n     * Send the repository a request to unblock a user, update the statemanager and publish\n     * a contact has been unblocked.\n     *\n     * @param  {Number} userId User id of user to unblock.\n     * @return {Promise} Renderer promise.\n     */\n    var unblockUser = function(userId) {\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:unblockUser');\n        render(newState);\n\n        return Repository.unblockUser(viewState.loggedInUserId, userId)\n            .then(function(profile) {\n                var newState = StateManager.addMembers(viewState, [profile]);\n                newState = StateManager.removePendingUnblockUsersById(newState, [userId]);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                PubSub.publish(MessageDrawerEvents.CONTACT_UNBLOCKED, userId);\n                return render(newState);\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Tell the statemanager there is a request to remove a user from the contact list\n     * and run the renderer to show the remove user from contacts dialogue.\n     *\n     * @param {Number} userId User id of user to remove from contacts.\n     */\n    var requestRemoveContact = function(userId) {\n        cancelRequest(userId);\n        var newState = StateManager.addPendingRemoveContactsById(viewState, [userId]);\n        render(newState);\n    };\n\n    /**\n     * Send the repository a request to remove a user from the contacts list. update the statemanager\n     * and publish a contact has been removed.\n     *\n     * @param  {Number} userId User id of user to remove from contacts.\n     * @return {Promise} Renderer promise.\n     */\n    var removeContact = function(userId) {\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:removeContact');\n        render(newState);\n\n        return Repository.deleteContacts(viewState.loggedInUserId, [userId])\n            .then(function(profiles) {\n                var newState = StateManager.addMembers(viewState, profiles);\n                newState = StateManager.removePendingRemoveContactsById(newState, [userId]);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                PubSub.publish(MessageDrawerEvents.CONTACT_REMOVED, userId);\n                return render(newState);\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Tell the statemanager there is a request to add a user to the contact list\n     * and run the renderer to show the add user to contacts dialogue.\n     *\n     * @param {Number} userId User id of user to add to contacts.\n     */\n    var requestAddContact = function(userId) {\n        cancelRequest(userId);\n        var newState = StateManager.addPendingAddContactsById(viewState, [userId]);\n        render(newState);\n    };\n\n    /**\n     * Send the repository a request to add a user to the contacts list. update the statemanager\n     * and publish a contact has been added.\n     *\n     * @param  {Number} userId User id of user to add to contacts.\n     * @return {Promise} Renderer promise.\n     */\n    var addContact = function(userId) {\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:addContactRequests');\n        render(newState);\n\n        return Repository.createContactRequest(viewState.loggedInUserId, userId)\n            .then(function(response) {\n                if (!response.request) {\n                    throw new Error(response.warnings[0].message);\n                }\n\n                return response.request;\n            })\n            .then(function(request) {\n                var newState = StateManager.removePendingAddContactsById(viewState, [userId]);\n                newState = StateManager.addContactRequests(newState, [request]);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                return render(newState);\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Set the current conversation as a favourite conversation.\n     *\n     * @return {Promise} Renderer promise.\n     */\n    var setFavourite = function() {\n        var userId = viewState.loggedInUserId;\n        var conversationId = viewState.id;\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:setFavourite');\n\n        return Repository.setFavouriteConversations(userId, [conversationId])\n            .then(function() {\n                var newState = StateManager.setIsFavourite(viewState, true);\n                return render(newState);\n            })\n            .then(function() {\n                return PubSub.publish(\n                    MessageDrawerEvents.CONVERSATION_SET_FAVOURITE,\n                    formatConversationForEvent(viewState)\n                );\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Unset the current conversation as a favourite conversation.\n     *\n     * @return {Promise} Renderer promise.\n     */\n    var unsetFavourite = function() {\n        var userId = viewState.loggedInUserId;\n        var conversationId = viewState.id;\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:unsetFavourite');\n\n        return Repository.unsetFavouriteConversations(userId, [conversationId])\n            .then(function() {\n                var newState = StateManager.setIsFavourite(viewState, false);\n                return render(newState);\n            })\n            .then(function() {\n                return PubSub.publish(\n                    MessageDrawerEvents.CONVERSATION_UNSET_FAVOURITE,\n                    formatConversationForEvent(viewState)\n                );\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Set the current conversation as a muted conversation.\n     *\n     * @return {Promise} Renderer promise.\n     */\n    var setMuted = function() {\n        var userId = viewState.loggedInUserId;\n        var conversationId = viewState.id;\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:markConversationAsRead');\n\n        return Repository.setMutedConversations(userId, [conversationId])\n            .then(function() {\n                var newState = StateManager.setIsMuted(viewState, true);\n                return render(newState);\n            })\n            .then(function() {\n                return PubSub.publish(\n                    MessageDrawerEvents.CONVERSATION_SET_MUTED,\n                    formatConversationForEvent(viewState)\n                );\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Unset the current conversation as a muted conversation.\n     *\n     * @return {Promise} Renderer promise.\n     */\n    var unsetMuted = function() {\n        var userId = viewState.loggedInUserId;\n        var conversationId = viewState.id;\n\n        return Repository.unsetMutedConversations(userId, [conversationId])\n            .then(function() {\n                var newState = StateManager.setIsMuted(viewState, false);\n                return render(newState);\n            })\n            .then(function() {\n                return PubSub.publish(\n                    MessageDrawerEvents.CONVERSATION_UNSET_MUTED,\n                    formatConversationForEvent(viewState)\n                );\n            });\n    };\n\n    /**\n     * Tell the statemanager there is a request to delete the selected messages\n     * and run the renderer to show confirm delete messages dialogue.\n     *\n     * @param {Number} userId User id.\n     */\n    var requestDeleteSelectedMessages = function(userId) {\n        var selectedMessageIds = viewState.selectedMessageIds;\n        cancelRequest(userId);\n        var newState = StateManager.addPendingDeleteMessagesById(viewState, selectedMessageIds);\n        render(newState);\n    };\n\n    /**\n     * Send the repository a request to delete the messages pending deletion. Update the statemanager\n     * and publish a message deletion event.\n     *\n     * @return {Promise} Renderer promise.\n     */\n    var deleteSelectedMessages = function() {\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:deleteSelectedMessages');\n        var messageIds = viewState.pendingDeleteMessageIds;\n        var sentMessages = viewState.messages.filter(function(message) {\n            // If a message sendState is null then it means it was loaded from the server or if it's\n            // set to sent then it means the user has successfully sent it in this page load.\n            return messageIds.indexOf(message.id) >= 0 && (message.sendState == 'sent' || message.sendState === null);\n        });\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n\n        render(newState);\n\n        var deleteMessagesPromise = $.Deferred().resolve().promise();\n\n\n        if (sentMessages.length) {\n            // We only need to send a request to the server if we're trying to delete messages that\n            // have successfully been sent.\n            var sentMessageIds = sentMessages.map(function(message) {\n                return message.id;\n            });\n            if (newState.deleteMessagesForAllUsers) {\n                deleteMessagesPromise = Repository.deleteMessagesForAllUsers(viewState.loggedInUserId, sentMessageIds);\n            } else {\n                deleteMessagesPromise = Repository.deleteMessages(viewState.loggedInUserId, sentMessageIds);\n            }\n        }\n\n        // Mark that we are deleting content from the  conversation to prevent updates of it.\n        isDeletingConversationContent = true;\n\n        // Stop polling for new messages to the open conversation.\n        if (newMessagesPollTimer) {\n            newMessagesPollTimer.stop();\n        }\n\n        return deleteMessagesPromise.then(function() {\n                var newState = StateManager.removeMessagesById(viewState, messageIds);\n                newState = StateManager.removePendingDeleteMessagesById(newState, messageIds);\n                newState = StateManager.removeSelectedMessagesById(newState, messageIds);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                newState = StateManager.setDeleteMessagesForAllUsers(newState, false);\n\n                var prevLastMessage = viewState.messages[viewState.messages.length - 1];\n                var newLastMessage = newState.messages.length ? newState.messages[newState.messages.length - 1] : null;\n\n                if (newLastMessage && newLastMessage.id != prevLastMessage.id) {\n                    var conversation = formatConversationForEvent(newState);\n                    PubSub.publish(MessageDrawerEvents.CONVERSATION_NEW_LAST_MESSAGE, conversation);\n                } else if (!newState.messages.length) {\n                    PubSub.publish(MessageDrawerEvents.CONVERSATION_DELETED, newState.id);\n                }\n\n                isDeletingConversationContent = false;\n                return render(newState);\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            })\n            .catch(Notification.exception);\n    };\n\n    /**\n     * Tell the statemanager there is a request to delete a conversation\n     * and run the renderer to show confirm delete conversation dialogue.\n     *\n     * @param {Number} userId User id of other user.\n     */\n    var requestDeleteConversation = function(userId) {\n        cancelRequest(userId);\n        var newState = StateManager.setPendingDeleteConversation(viewState, true);\n        render(newState);\n    };\n\n    /**\n     * Send the repository a request to delete a conversation. Update the statemanager\n     * and publish a conversation deleted event.\n     *\n     * @return {Promise} Renderer promise.\n     */\n    var deleteConversation = function() {\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:markConversationAsRead');\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n        render(newState);\n\n        // Mark that we are deleting the conversation to prevent updates of it.\n        isDeletingConversationContent = true;\n\n        // Stop polling for new messages to the open conversation.\n        if (newMessagesPollTimer) {\n            newMessagesPollTimer.stop();\n        }\n\n        return Repository.deleteConversation(viewState.loggedInUserId, viewState.id)\n            .then(function() {\n                var newState = StateManager.removeMessages(viewState, viewState.messages);\n                newState = StateManager.removeSelectedMessagesById(newState, viewState.selectedMessageIds);\n                newState = StateManager.setPendingDeleteConversation(newState, false);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                PubSub.publish(MessageDrawerEvents.CONVERSATION_DELETED, newState.id);\n\n                isDeletingConversationContent = false;\n\n                return render(newState);\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Tell the statemanager to cancel all pending actions.\n     *\n     * @param  {Number} userId User id.\n     */\n    var cancelRequest = function(userId) {\n        var pendingDeleteMessageIds = viewState.pendingDeleteMessageIds;\n        var newState = StateManager.removePendingAddContactsById(viewState, [userId]);\n        newState = StateManager.removePendingRemoveContactsById(newState, [userId]);\n        newState = StateManager.removePendingUnblockUsersById(newState, [userId]);\n        newState = StateManager.removePendingBlockUsersById(newState, [userId]);\n        newState = StateManager.removePendingDeleteMessagesById(newState, pendingDeleteMessageIds);\n        newState = StateManager.setPendingDeleteConversation(newState, false);\n        newState = StateManager.setDeleteMessagesForAllUsers(newState, false);\n        render(newState);\n    };\n\n    /**\n     * Accept the contact request from the given user.\n     *\n     * @param  {Number} userId User id of other user.\n     * @return {Promise} Renderer promise.\n     */\n    var acceptContactRequest = function(userId) {\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:acceptContactRequest');\n\n        // Search the list of the logged in user's contact requests to find the\n        // one from this user.\n        var loggedInUserId = viewState.loggedInUserId;\n        var requests = viewState.members[userId].contactrequests.filter(function(request) {\n            return request.requesteduserid == loggedInUserId;\n        });\n        var request = requests[0];\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n        render(newState);\n\n        return Repository.acceptContactRequest(userId, loggedInUserId)\n            .then(function(profile) {\n                var newState = StateManager.removeContactRequests(viewState, [request]);\n                newState = StateManager.addMembers(viewState, [profile]);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                return render(newState);\n            })\n            .then(function() {\n                PubSub.publish(MessageDrawerEvents.CONTACT_ADDED, viewState.members[userId]);\n                PubSub.publish(MessageDrawerEvents.CONTACT_REQUEST_ACCEPTED, request);\n                return;\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Decline the contact request from the given user.\n     *\n     * @param  {Number} userId User id of other user.\n     * @return {Promise} Renderer promise.\n     */\n    var declineContactRequest = function(userId) {\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:declineContactRequest');\n\n        // Search the list of the logged in user's contact requests to find the\n        // one from this user.\n        var loggedInUserId = viewState.loggedInUserId;\n        var requests = viewState.members[userId].contactrequests.filter(function(request) {\n            return request.requesteduserid == loggedInUserId;\n        });\n        var request = requests[0];\n        var newState = StateManager.setLoadingConfirmAction(viewState, true);\n        render(newState);\n\n        return Repository.declineContactRequest(userId, loggedInUserId)\n            .then(function(profile) {\n                var newState = StateManager.removeContactRequests(viewState, [request]);\n                newState = StateManager.addMembers(viewState, [profile]);\n                newState = StateManager.setLoadingConfirmAction(newState, false);\n                return render(newState);\n            })\n            .then(function() {\n                PubSub.publish(MessageDrawerEvents.CONTACT_REQUEST_DECLINED, request);\n                return;\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            });\n    };\n\n    /**\n     * Send all of the messages in the buffer to the server to be created. Update the\n     * UI with the newly created message information.\n     *\n     * This function will recursively call itself in order to make sure the buffer is\n     * always being processed.\n     */\n    var processSendMessageBuffer = function() {\n        if (isSendingMessage) {\n            // We're already sending messages so nothing to do.\n            return;\n        }\n        if (!sendMessageBuffer.length) {\n            // No messages waiting to send. Nothing to do.\n            return;\n        }\n\n        var pendingPromise = new Pending('core_message/message_drawer_view_conversation:processSendMessageBuffer');\n\n        // Flag that we're processing the queue.\n        isSendingMessage = true;\n        // Grab all of the messages in the buffer.\n        var messagesToSend = sendMessageBuffer.slice();\n        // Empty the buffer since we're processing it.\n        sendMessageBuffer = [];\n        var conversationId = viewState.id;\n        var newConversationId = null;\n        var messagesText = messagesToSend.map(function(message) {\n            return message.text;\n        });\n        var messageIds = messagesToSend.map(function(message) {\n            return message.id;\n        });\n        var sendMessagePromise = null;\n        var newCanDeleteMessagesForAllUsers = null;\n        if (!conversationId && (viewState.type != CONVERSATION_TYPES.PUBLIC)) {\n            // If it's a new private conversation then we need to use the old\n            // web service function to create the conversation.\n            var otherUserId = getOtherUserId();\n            sendMessagePromise = Repository.sendMessagesToUser(otherUserId, messagesText)\n                .then(function(messages) {\n                    if (messages.length) {\n                        newConversationId = parseInt(messages[0].conversationid, 10);\n                        newCanDeleteMessagesForAllUsers = messages[0].candeletemessagesforallusers;\n                    }\n                    return messages;\n                });\n        } else {\n            sendMessagePromise = Repository.sendMessagesToConversation(conversationId, messagesText);\n        }\n\n        sendMessagePromise\n            .then(function(messages) {\n                var newMessageIds = messages.map(function(message) {\n                    return message.id;\n                });\n                var data = [];\n                var selectedToRemove = [];\n                var selectedToAdd = [];\n\n                messagesToSend.forEach(function(oldMessage, index) {\n                    var newMessage = messages[index];\n                    // Update messages expects and array of arrays where the first value\n                    // is the old message to update and the second value is the new values\n                    // to set.\n                    data.push([oldMessage, newMessage]);\n\n                    if (viewState.selectedMessageIds.indexOf(oldMessage.id) >= 0) {\n                        // If the message was added to the \"selected messages\" list while it was still\n                        // being sent then we should update it's id in that list now to make sure future\n                        // actions work.\n                        selectedToRemove.push(oldMessage.id);\n                        selectedToAdd.push(newMessage.id);\n                    }\n                });\n                var newState = StateManager.updateMessages(viewState, data);\n                newState = StateManager.setMessagesSendSuccessById(newState, newMessageIds);\n\n                if (selectedToRemove.length) {\n                    newState = StateManager.removeSelectedMessagesById(newState, selectedToRemove);\n                }\n\n                if (selectedToAdd.length) {\n                    newState = StateManager.addSelectedMessagesById(newState, selectedToAdd);\n                }\n\n                var conversation = formatConversationForEvent(newState);\n\n                if (!newState.id) {\n                    // If this message created the conversation then save the conversation\n                    // id.\n                    newState = StateManager.setId(newState, newConversationId);\n                    conversation.id = newConversationId;\n                    resetMessagePollTimer(newConversationId);\n                    PubSub.publish(MessageDrawerEvents.CONVERSATION_CREATED, conversation);\n                    newState = StateManager.setCanDeleteMessagesForAllUsers(newState, newCanDeleteMessagesForAllUsers);\n                }\n\n                // Update the UI with the new message values from the server.\n                render(newState);\n                // Recurse just in case there has been more messages added to the buffer.\n                isSendingMessage = false;\n                processSendMessageBuffer();\n                PubSub.publish(MessageDrawerEvents.CONVERSATION_NEW_LAST_MESSAGE, conversation);\n                return;\n            })\n            .then(function(result) {\n                pendingPromise.resolve();\n\n                return result;\n            })\n            .catch(function(e) {\n                var errorMessage;\n                if (e.message) {\n                    errorMessage = $.Deferred().resolve(e.message).promise();\n                } else {\n                    errorMessage = Str.get_string('unknownerror', 'core');\n                }\n\n                var handleFailedMessages = function(errorMessage) {\n                    // We failed to create messages so remove the old messages from the pending queue\n                    // and update the UI to indicate that the message failed.\n                    var newState = StateManager.setMessagesSendFailById(viewState, messageIds, errorMessage);\n                    render(newState);\n                    isSendingMessage = false;\n                    processSendMessageBuffer();\n                };\n\n                errorMessage.then(handleFailedMessages)\n                    .then(function(result) {\n                        pendingPromise.resolve();\n\n                        return result;\n                    })\n                    .catch(function(e) {\n                        // Hrmm, we can't even load the error messages string! We'll have to\n                        // hard code something in English here if we still haven't got a message\n                        // to show.\n                        var finalError = e.message || 'Something went wrong!';\n                        handleFailedMessages(finalError);\n                    });\n            });\n    };\n\n    /**\n     * Create a plain version of an HTML text.\n     *\n     * This texts is used as a message preview while is sent to the server. This way\n     * it is possible to prevent self-xss.\n     *\n     * @param {String} text Text to send.\n     * @return {String} The plain text version of the text.\n     */\n    const previewText = function(text) {\n        // Remove all script and styles from text (we don't want it there).\n        let plaintext = text.replace(/<style([\\s\\S]*?)<\\/style>/gi, '');\n        plaintext = plaintext.replace(/<script([\\s\\S]*?)<\\/script>/gi, '');\n        // Beautify a bit the output adding some line breaks.\n        plaintext = plaintext.replace(/<\\/div>/ig, '\\n');\n        plaintext = plaintext.replace(/<\\/li>/ig, '\\n');\n        plaintext = plaintext.replace(/<li>/ig, '  *  ');\n        plaintext = plaintext.replace(/<\\/ul>/ig, '\\n');\n        plaintext = plaintext.replace(/<\\/p>/ig, '\\n');\n        plaintext = plaintext.replace(/<br[^>]*>/gi, '\\n');\n        // Remove all remaining tags and convert line breaks into html.\n        plaintext = plaintext.replace(/<[^>]+>/ig, '');\n        plaintext = plaintext.replace(/\\n+/ig, '\\n');\n        return plaintext.replace(/\\n/ig, '<br>');\n    };\n\n    /**\n     * Buffers messages to be sent to the server. We use a buffer here to allow the\n     * user to freely input messages without blocking the interface for them.\n     *\n     * Instead we just queue all of their messages up and send them as fast as we can.\n     *\n     * @param {String} text Text to send.\n     */\n    var sendMessage = function(text) {\n        var id = 'temp' + Date.now();\n        // Render a preview version of the message while sending.\n        let loadingmessage = {\n            id: id,\n            useridfrom: viewState.loggedInUserId,\n            text:  previewText(text),\n            timecreated: null\n        };\n        var newState = StateManager.addMessages(viewState, [loadingmessage]);\n        render(newState);\n        // Send the real message.\n        var message = {\n            id: id,\n            useridfrom: viewState.loggedInUserId,\n            text: text,\n            timecreated: null\n        };\n        sendMessageBuffer.push(message);\n        processSendMessageBuffer();\n    };\n\n    /**\n     * Retry sending a message that failed.\n     *\n     * @param {Object} message The message to send.\n     */\n    var retrySendMessage = function(message) {\n        var newState = StateManager.setMessagesSendPendingById(viewState, [message.id]);\n        render(newState);\n        sendMessageBuffer.push(message);\n        processSendMessageBuffer();\n    };\n\n    /**\n     * Toggle the selected messages update the statemanager and render the result.\n     *\n     * @param  {Number} messageId The id of the message to be toggled\n     */\n    var toggleSelectMessage = function(messageId) {\n        var newState = viewState;\n\n        if (viewState.selectedMessageIds.indexOf(messageId) > -1) {\n            newState = StateManager.removeSelectedMessagesById(viewState, [messageId]);\n        } else {\n            newState = StateManager.addSelectedMessagesById(viewState, [messageId]);\n        }\n\n        render(newState);\n    };\n\n    /**\n     * Cancel edit mode (selecting the messages).\n     */\n    var cancelEditMode = function() {\n        cancelRequest(getOtherUserId());\n        var newState = StateManager.removeSelectedMessagesById(viewState, viewState.selectedMessageIds);\n        render(newState);\n    };\n\n    /**\n     * Process the patches in the render buffer one at a time in order until the\n     * buffer is empty.\n     *\n     * @param {Object} header The conversation header container element.\n     * @param {Object} body The conversation body container element.\n     * @param {Object} footer The conversation footer container element.\n     */\n    var processRenderBuffer = function(header, body, footer) {\n        if (isRendering) {\n            return;\n        }\n\n        if (!renderBuffer.length) {\n            return;\n        }\n\n        isRendering = true;\n        var renderable = renderBuffer.shift();\n        var renderPromises = renderers.map(function(renderFunc) {\n            return renderFunc(renderable.patch);\n        });\n\n        $.when.apply(null, renderPromises)\n            .then(function() {\n                isRendering = false;\n                renderable.deferred.resolve(true);\n                // Keep processing the buffer until it's empty.\n                processRenderBuffer(header, body, footer);\n\n                return;\n            })\n            .catch(function(error) {\n                isRendering = false;\n                renderable.deferred.reject(error);\n                Notification.exception(error);\n            });\n    };\n\n    /**\n     * Create a function to render the Conversation.\n     *\n     * @param  {Object} header The conversation header container element.\n     * @param  {Object} body The conversation body container element.\n     * @param  {Object} footer The conversation footer container element.\n     * @param  {Bool} isNewConversation Has someone else already initialised a conversation?\n     * @return {Promise} Renderer promise.\n     */\n    var generateRenderFunction = function(header, body, footer, isNewConversation) {\n        var rendererFunc = function(patch) {\n            return Renderer.render(header, body, footer, patch);\n        };\n\n        if (!isNewConversation) {\n            // Looks like someone got here before us! We'd better update our\n            // UI to make sure it matches.\n            var initialState = StateManager.buildInitialState(viewState.midnight, viewState.loggedInUserId, viewState.id);\n            var syncPatch = Patcher.buildPatch(initialState, viewState);\n            rendererFunc(syncPatch);\n        }\n\n        renderers.push(rendererFunc);\n\n        return function(newState) {\n            var patch = Patcher.buildPatch(viewState, newState);\n            var deferred = $.Deferred();\n\n            // Check if the patch has any data. Ignore empty patches.\n            if (Object.keys(patch).length) {\n                // Add the patch to the render buffer which gets processed in order.\n                renderBuffer.push({\n                    patch: patch,\n                    deferred: deferred\n                });\n            } else {\n                deferred.resolve(true);\n            }\n            // This is a great place to add in some console logging if you need\n            // to debug something. You can log the current state, the next state,\n            // and the generated patch and see exactly what will be updated.\n\n            // Optimistically update the state. We're going to assume that the rendering\n            // will always succeed. The rendering is asynchronous (annoyingly) so it's buffered\n            // but it'll reach eventual consistency with the current state.\n            viewState = newState;\n            if (newState.id) {\n                // Only cache created conversations.\n                stateCache[newState.id] = {\n                    state: newState,\n                    messagesOffset: getMessagesOffset(),\n                    loadedAllMessages: hasLoadedAllMessages()\n                };\n            }\n\n            // Start processing the buffer.\n            processRenderBuffer(header, body, footer);\n\n            return deferred.promise();\n        };\n    };\n\n    /**\n     * Create a confirm action function.\n     *\n     * @param {Function} actionCallback The callback function.\n     * @return {Function} Confirm action handler.\n     */\n    var generateConfirmActionHandler = function(actionCallback) {\n        return function(e, data) {\n            if (!viewState.loadingConfirmAction) {\n                actionCallback(getOtherUserId());\n                var newState = StateManager.setLoadingConfirmAction(viewState, false);\n                render(newState);\n            }\n            data.originalEvent.preventDefault();\n        };\n    };\n\n    /**\n     * Send message event handler.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleSendMessage = function(e, data) {\n        var target = $(e.target);\n        var footerContainer = target.closest(SELECTORS.FOOTER_CONTAINER);\n        var textArea = footerContainer.find(SELECTORS.MESSAGE_TEXT_AREA);\n        var text = textArea.val().trim();\n\n        if (text !== '') {\n            sendMessage(text);\n            textArea.val('');\n            textArea.focus();\n        }\n\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Select message event handler.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleSelectMessage = function(e, data) {\n        var selection = window.getSelection();\n        var target = $(e.target);\n\n        if (selection.toString() != '') {\n            // Bail if we're selecting.\n            return;\n        }\n\n        if (target.is('a')) {\n            // Clicking on a link in the message so ignore it.\n            return;\n        }\n\n        var element = target.closest(SELECTORS.MESSAGE);\n        var messageId = element.attr('data-message-id');\n\n        toggleSelectMessage(messageId);\n\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Handle retry sending of message.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleRetrySendMessage = function(e, data) {\n        var target = $(e.target);\n        var element = target.closest(SELECTORS.MESSAGE);\n        var messageId = element.attr('data-message-id');\n        var messages = viewState.messages.filter(function(message) {\n            return message.id == messageId;\n        });\n        var message = messages.length ? messages[0] : null;\n\n        if (message) {\n            retrySendMessage(message);\n        }\n\n        data.originalEvent.preventDefault();\n        data.originalEvent.stopPropagation();\n        e.stopPropagation();\n    };\n\n    /**\n     * Cancel edit mode event handler.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleCancelEditMode = function(e, data) {\n        cancelEditMode();\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Show the view contact page.\n     *\n     * @param {String} namespace Unique identifier for the Routes\n     * @return {Function} View contact handler.\n     */\n    var generateHandleViewContact = function(namespace) {\n        return function(e, data) {\n            var otherUserId = getOtherUserId();\n            var otherUser = viewState.members[otherUserId];\n            MessageDrawerRouter.go(namespace, MessageDrawerRoutes.VIEW_CONTACT, otherUser);\n            data.originalEvent.preventDefault();\n        };\n    };\n\n    /**\n     * Set this conversation as a favourite.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleSetFavourite = function(e, data) {\n        setFavourite().catch(Notification.exception);\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Unset this conversation as a favourite.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleUnsetFavourite = function(e, data) {\n        unsetFavourite().catch(Notification.exception);\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Show the view group info page.\n     * Set this conversation as muted.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleSetMuted = function(e, data) {\n        setMuted().catch(Notification.exception);\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Unset this conversation as muted.\n     *\n     * @param {Object} e Element this event handler is called on.\n     * @param {Object} data Data for this event.\n     */\n    var handleUnsetMuted = function(e, data) {\n        unsetMuted().catch(Notification.exception);\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Handle clicking on the checkbox that toggles deleting messages for\n     * all users.\n     *\n     * @param {Object} e Element this event handler is called on.\n     */\n    var handleDeleteMessagesForAllUsersToggle = function(e) {\n        var newValue = $(e.target).prop('checked');\n        var newState = StateManager.setDeleteMessagesForAllUsers(viewState, newValue);\n        render(newState);\n    };\n\n    /**\n     * Show the view contact page.\n     *\n     * @param {String} namespace Unique identifier for the Routes\n     * @return {Function} View group info handler.\n     */\n    var generateHandleViewGroupInfo = function(namespace) {\n        return function(e, data) {\n            MessageDrawerRouter.go(\n                namespace,\n                MessageDrawerRoutes.VIEW_GROUP_INFO,\n                {\n                    id: viewState.id,\n                    name: viewState.name,\n                    subname: viewState.subname,\n                    imageUrl: viewState.imageUrl,\n                    totalMemberCount: viewState.totalMemberCount\n                },\n                viewState.loggedInUserId\n            );\n            data.originalEvent.preventDefault();\n        };\n    };\n\n    /**\n     * Handle clicking on the emoji toggle button.\n     *\n     * @param {Object} e The event\n     * @param {Object} data The custom interaction event data\n     */\n    var handleToggleEmojiPicker = function(e, data) {\n        var newState = StateManager.setShowEmojiPicker(viewState, !viewState.showEmojiPicker);\n        render(newState);\n        data.originalEvent.preventDefault();\n    };\n\n    /**\n     * Handle clicking outside the emoji picker to close it.\n     *\n     * @param {Object} e The event\n     */\n    var handleCloseEmojiPicker = function(e) {\n        var target = $(e.target);\n\n        if (\n            viewState.showEmojiPicker &&\n            !target.closest(SELECTORS.EMOJI_PICKER_CONTAINER).length &&\n            !target.closest(SELECTORS.TOGGLE_EMOJI_PICKER_BUTTON).length\n        ) {\n            var newState = StateManager.setShowEmojiPicker(viewState, false);\n            render(newState);\n        }\n    };\n\n    /**\n     * Listen to, and handle events for conversations.\n     *\n     * @param {string} namespace The route namespace.\n     * @param {Object} header Conversation header container element.\n     * @param {Object} body Conversation body container element.\n     * @param {Object} footer Conversation footer container element.\n     */\n    var registerEventListeners = function(namespace, header, body, footer) {\n        var isLoadingMoreMessages = false;\n        var messagesContainer = getMessagesContainer(body);\n        var emojiPickerElement = footer.find(SELECTORS.EMOJI_PICKER);\n        var emojiAutoCompleteContainer = footer.find(SELECTORS.EMOJI_AUTO_COMPLETE_CONTAINER);\n        var messageTextArea = footer.find(SELECTORS.MESSAGE_TEXT_AREA);\n        var headerActivateHandlers = [\n            [SELECTORS.ACTION_REQUEST_BLOCK, generateConfirmActionHandler(requestBlockUser)],\n            [SELECTORS.ACTION_REQUEST_UNBLOCK, generateConfirmActionHandler(requestUnblockUser)],\n            [SELECTORS.ACTION_REQUEST_ADD_CONTACT, generateConfirmActionHandler(requestAddContact)],\n            [SELECTORS.ACTION_REQUEST_REMOVE_CONTACT, generateConfirmActionHandler(requestRemoveContact)],\n            [SELECTORS.ACTION_REQUEST_DELETE_CONVERSATION, generateConfirmActionHandler(requestDeleteConversation)],\n            [SELECTORS.ACTION_CANCEL_EDIT_MODE, handleCancelEditMode],\n            [SELECTORS.ACTION_VIEW_CONTACT, generateHandleViewContact(namespace)],\n            [SELECTORS.ACTION_VIEW_GROUP_INFO, generateHandleViewGroupInfo(namespace)],\n            [SELECTORS.ACTION_CONFIRM_FAVOURITE, handleSetFavourite],\n            [SELECTORS.ACTION_CONFIRM_MUTE, handleSetMuted],\n            [SELECTORS.ACTION_CONFIRM_UNFAVOURITE, handleUnsetFavourite],\n            [SELECTORS.ACTION_CONFIRM_UNMUTE, handleUnsetMuted]\n        ];\n        var bodyActivateHandlers = [\n            [SELECTORS.ACTION_CANCEL_CONFIRM, generateConfirmActionHandler(cancelRequest)],\n            [SELECTORS.ACTION_CONFIRM_BLOCK, generateConfirmActionHandler(blockUser)],\n            [SELECTORS.ACTION_CONFIRM_UNBLOCK, generateConfirmActionHandler(unblockUser)],\n            [SELECTORS.ACTION_CONFIRM_ADD_CONTACT, generateConfirmActionHandler(addContact)],\n            [SELECTORS.ACTION_CONFIRM_REMOVE_CONTACT, generateConfirmActionHandler(removeContact)],\n            [SELECTORS.ACTION_CONFIRM_DELETE_SELECTED_MESSAGES, generateConfirmActionHandler(deleteSelectedMessages)],\n            [SELECTORS.ACTION_CONFIRM_DELETE_CONVERSATION, generateConfirmActionHandler(deleteConversation)],\n            [SELECTORS.ACTION_OKAY_CONFIRM, generateConfirmActionHandler(cancelRequest)],\n            [SELECTORS.ACTION_REQUEST_ADD_CONTACT, generateConfirmActionHandler(requestAddContact)],\n            [SELECTORS.ACTION_ACCEPT_CONTACT_REQUEST, generateConfirmActionHandler(acceptContactRequest)],\n            [SELECTORS.ACTION_DECLINE_CONTACT_REQUEST, generateConfirmActionHandler(declineContactRequest)],\n            [SELECTORS.MESSAGE, handleSelectMessage],\n            [SELECTORS.DELETE_MESSAGES_FOR_ALL_USERS_TOGGLE, handleDeleteMessagesForAllUsersToggle],\n            [SELECTORS.RETRY_SEND, handleRetrySendMessage]\n        ];\n        var footerActivateHandlers = [\n            [SELECTORS.SEND_MESSAGE_BUTTON, handleSendMessage],\n            [SELECTORS.TOGGLE_EMOJI_PICKER_BUTTON, handleToggleEmojiPicker],\n            [SELECTORS.ACTION_REQUEST_DELETE_SELECTED_MESSAGES, generateConfirmActionHandler(requestDeleteSelectedMessages)],\n            [SELECTORS.ACTION_REQUEST_ADD_CONTACT, generateConfirmActionHandler(requestAddContact)],\n            [SELECTORS.ACTION_REQUEST_UNBLOCK, generateConfirmActionHandler(requestUnblockUser)],\n        ];\n\n        AutoRows.init(footer);\n\n        if (emojiAutoCompleteContainer.length) {\n            initialiseEmojiAutoComplete(\n                emojiAutoCompleteContainer[0],\n                messageTextArea[0],\n                function(hasSuggestions) {\n                    var newState = StateManager.setShowEmojiAutoComplete(viewState, hasSuggestions);\n                    render(newState);\n                },\n                function(emoji) {\n                    var newState = StateManager.setShowEmojiAutoComplete(viewState, false);\n                    render(newState);\n\n                    messageTextArea.focus();\n                    var cursorPos = messageTextArea.prop('selectionStart');\n                    var currentText = messageTextArea.val();\n                    var textBefore = currentText.substring(0, cursorPos).replace(/\\S*$/, '');\n                    var textAfter = currentText.substring(cursorPos).replace(/^\\S*/, '');\n\n                    messageTextArea.val(textBefore + emoji + textAfter);\n                    // Set the cursor position to after the inserted emoji.\n                    messageTextArea.prop('selectionStart', textBefore.length + emoji.length);\n                    messageTextArea.prop('selectionEnd', textBefore.length + emoji.length);\n                }\n            );\n        }\n\n        if (emojiPickerElement.length) {\n            initialiseEmojiPicker(emojiPickerElement[0], function(emoji) {\n                var newState = StateManager.setShowEmojiPicker(viewState, !viewState.showEmojiPicker);\n                render(newState);\n\n                messageTextArea.focus();\n                var cursorPos = messageTextArea.prop('selectionStart');\n                var currentText = messageTextArea.val();\n                var textBefore = currentText.substring(0, cursorPos);\n                var textAfter = currentText.substring(cursorPos, currentText.length);\n\n                messageTextArea.val(textBefore + emoji + textAfter);\n                // Set the cursor position to after the inserted emoji.\n                messageTextArea.prop('selectionStart', cursorPos + emoji.length);\n                messageTextArea.prop('selectionEnd', cursorPos + emoji.length);\n            });\n        }\n\n        CustomEvents.define(header, [\n            CustomEvents.events.activate\n        ]);\n        CustomEvents.define(body, [\n            CustomEvents.events.activate\n        ]);\n        CustomEvents.define(footer, [\n            CustomEvents.events.activate,\n            CustomEvents.events.enter,\n            CustomEvents.events.escape\n        ]);\n        CustomEvents.define(messagesContainer, [\n            CustomEvents.events.scrollTop,\n            CustomEvents.events.scrollLock\n        ]);\n\n        messagesContainer.on(CustomEvents.events.scrollTop, function(e, data) {\n            var hasMembers = Object.keys(viewState.members).length > 1;\n\n            if (!isResetting && !isLoadingMoreMessages && !hasLoadedAllMessages() && hasMembers) {\n                isLoadingMoreMessages = true;\n                var newState = StateManager.setLoadingMessages(viewState, true);\n                render(newState);\n\n                loadMessages(viewState.id, LOAD_MESSAGE_LIMIT, getMessagesOffset(), NEWEST_FIRST, [])\n                    .then(function() {\n                        isLoadingMoreMessages = false;\n                        setMessagesOffset(getMessagesOffset() + LOAD_MESSAGE_LIMIT);\n                        return;\n                    })\n                    .catch(function(error) {\n                        isLoadingMoreMessages = false;\n                        Notification.exception(error);\n                    });\n            }\n\n            data.originalEvent.preventDefault();\n        });\n\n        headerActivateHandlers.forEach(function(handler) {\n            var selector = handler[0];\n            var handlerFunction = handler[1];\n            header.on(CustomEvents.events.activate, selector, handlerFunction);\n        });\n\n        bodyActivateHandlers.forEach(function(handler) {\n            var selector = handler[0];\n            var handlerFunction = handler[1];\n            body.on(CustomEvents.events.activate, selector, handlerFunction);\n        });\n\n        footerActivateHandlers.forEach(function(handler) {\n            var selector = handler[0];\n            var handlerFunction = handler[1];\n            footer.on(CustomEvents.events.activate, selector, handlerFunction);\n        });\n\n        footer.on(CustomEvents.events.enter, SELECTORS.MESSAGE_TEXT_AREA, function(e, data) {\n            var enterToSend = footer.attr('data-enter-to-send');\n            if (enterToSend && enterToSend != 'false' && enterToSend != '0') {\n                handleSendMessage(e, data);\n            }\n        });\n\n        footer.on(CustomEvents.events.escape, SELECTORS.EMOJI_PICKER_CONTAINER, handleToggleEmojiPicker);\n        $(document.body).on('click', handleCloseEmojiPicker);\n\n        PubSub.subscribe(MessageDrawerEvents.ROUTE_CHANGED, function(newRouteData) {\n            if (newMessagesPollTimer) {\n                if (newRouteData.route != MessageDrawerRoutes.VIEW_CONVERSATION) {\n                    newMessagesPollTimer.stop();\n                }\n            }\n        });\n    };\n\n    /**\n     * Reset the timer that polls for new messages.\n     *\n     * @param  {Number} conversationId The conversation id\n     */\n    var resetMessagePollTimer = function(conversationId) {\n        if (newMessagesPollTimer) {\n            newMessagesPollTimer.stop();\n        }\n\n        newMessagesPollTimer = new BackOffTimer(\n            getLoadNewMessagesCallback(conversationId, NEWEST_FIRST),\n            BackOffTimer.getIncrementalCallback(\n                viewState.messagePollMin * MILLISECONDS_IN_SEC,\n                MILLISECONDS_IN_SEC,\n                viewState.messagePollMax * MILLISECONDS_IN_SEC,\n                viewState.messagePollAfterMax * MILLISECONDS_IN_SEC\n            )\n        );\n\n        newMessagesPollTimer.start();\n    };\n\n    /**\n     * Reset the state to the initial state and render the UI.\n     *\n     * @param  {Object} body Conversation body container element.\n     * @param  {Number|null} conversationId The conversation id.\n     * @param  {Object} loggedInUserProfile The logged in user's profile.\n     */\n    var resetState = function(body, conversationId, loggedInUserProfile) {\n        // Reset all of the states back to the beginning if we're loading a new\n        // conversation.\n        if (newMessagesPollTimer) {\n            newMessagesPollTimer.stop();\n        }\n        loadedAllMessages = false;\n        messagesOffset = 0;\n        newMessagesPollTimer = null;\n        isRendering = false;\n        renderBuffer = [];\n        isResetting = true;\n        isSendingMessage = false;\n        isDeletingConversationContent = false;\n        sendMessageBuffer = [];\n\n        var loggedInUserId = loggedInUserProfile.id;\n        var midnight = parseInt(body.attr('data-midnight'), 10);\n        var messagePollMin = parseInt(body.attr('data-message-poll-min'), 10);\n        var messagePollMax = parseInt(body.attr('data-message-poll-max'), 10);\n        var messagePollAfterMax = parseInt(body.attr('data-message-poll-after-max'), 10);\n        var initialState = StateManager.buildInitialState(\n            midnight,\n            loggedInUserId,\n            conversationId,\n            messagePollMin,\n            messagePollMax,\n            messagePollAfterMax\n        );\n\n        if (!viewState) {\n            viewState = initialState;\n        }\n\n        render(initialState);\n    };\n\n    /**\n     * Load a new empty private conversation between two users or self-conversation.\n     *\n     * @param  {Object} body Conversation body container element.\n     * @param  {Object} loggedInUserProfile The logged in user's profile.\n     * @param  {Int} otherUserId The other user's id.\n     * @return {Promise} Renderer promise.\n     */\n    var resetNoConversation = function(body, loggedInUserProfile, otherUserId) {\n        // Always reset the state back to the initial state so that the\n        // state manager and patcher can work correctly.\n        resetState(body, null, loggedInUserProfile);\n\n        var resetNoConversationPromise = null;\n\n        if (loggedInUserProfile.id != otherUserId) {\n            // Private conversation between two different users.\n            resetNoConversationPromise = Repository.getConversationBetweenUsers(\n                loggedInUserProfile.id,\n                otherUserId,\n                true,\n                true,\n                0,\n                0,\n                LOAD_MESSAGE_LIMIT,\n                0,\n                NEWEST_FIRST\n            );\n        } else {\n            // Self conversation.\n            resetNoConversationPromise = Repository.getSelfConversation(\n                loggedInUserProfile.id,\n                LOAD_MESSAGE_LIMIT,\n                0,\n                NEWEST_FIRST\n            );\n        }\n\n        return resetNoConversationPromise.then(function(conversation) {\n                // Looks like we have a conversation after all! Let's use that.\n                return resetByConversation(body, conversation, loggedInUserProfile);\n            })\n            .catch(function() {\n                // Can't find a conversation. Oh well. Just load up a blank one.\n                return loadEmptyPrivateConversation(loggedInUserProfile, otherUserId);\n            });\n    };\n\n    /**\n     * Load new messages into the conversation based on a time interval.\n     *\n     * @param  {Object} body Conversation body container element.\n     * @param  {Number} conversationId The conversation id.\n     * @param  {Object} loggedInUserProfile The logged in user's profile.\n     * @return {Promise} Renderer promise.\n     */\n    var resetById = function(body, conversationId, loggedInUserProfile) {\n        var cache = null;\n        if (conversationId in stateCache) {\n            cache = stateCache[conversationId];\n        }\n\n        // Always reset the state back to the initial state so that the\n        // state manager and patcher can work correctly.\n        resetState(body, conversationId, loggedInUserProfile);\n\n        var promise = $.Deferred().resolve({}).promise();\n        if (cache) {\n            // We've seen this conversation before so there is no need to\n            // send any network requests.\n            var newState = cache.state;\n            // Reset some loading states just in case they were left weirdly.\n            newState = StateManager.setLoadingMessages(newState, false);\n            newState = StateManager.setLoadingMembers(newState, false);\n            setMessagesOffset(cache.messagesOffset);\n            setLoadedAllMessages(cache.loadedAllMessages);\n            render(newState);\n        } else {\n            promise = loadNewConversation(\n                conversationId,\n                loggedInUserProfile,\n                LOAD_MESSAGE_LIMIT,\n                0,\n                NEWEST_FIRST\n            );\n        }\n\n        return promise.then(function() {\n            return resetMessagePollTimer(conversationId);\n        });\n    };\n\n    /**\n     * Load new messages into the conversation based on a time interval.\n     *\n     * @param  {Object} body Conversation body container element.\n     * @param  {Object} conversation The conversation.\n     * @param  {Object} loggedInUserProfile The logged in user's profile.\n     * @return {Promise} Renderer promise.\n     */\n    var resetByConversation = function(body, conversation, loggedInUserProfile) {\n        var cache = null;\n        if (conversation.id in stateCache) {\n            cache = stateCache[conversation.id];\n        }\n\n        // Always reset the state back to the initial state so that the\n        // state manager and patcher can work correctly.\n        resetState(body, conversation.id, loggedInUserProfile);\n\n        var promise = $.Deferred().resolve({}).promise();\n        if (cache) {\n            // We've seen this conversation before so there is no need to\n            // send any network requests.\n            var newState = cache.state;\n            // Reset some loading states just in case they were left weirdly.\n            newState = StateManager.setLoadingMessages(newState, false);\n            newState = StateManager.setLoadingMembers(newState, false);\n            setMessagesOffset(cache.messagesOffset);\n            setLoadedAllMessages(cache.loadedAllMessages);\n            render(newState);\n        } else {\n            promise = loadExistingConversation(\n                conversation,\n                loggedInUserProfile,\n                LOAD_MESSAGE_LIMIT,\n                NEWEST_FIRST\n            );\n        }\n\n        return promise.then(function() {\n            return resetMessagePollTimer(conversation.id);\n        });\n    };\n\n    /**\n     * Setup the conversation page. This is a rather complex function because there are a\n     * few combinations of arguments that can be provided to this function to show the\n     * conversation.\n     *\n     * There are:\n     * 1.) A conversation object with no action or other user id (e.g. from the overview page)\n     * 2.) A conversation id with no action or other user id (e.g. from the contacts page)\n     * 3.) No conversation/id with an action and other other user id. (e.g. from contact page)\n     *\n     * @param {string} namespace The route namespace.\n     * @param {Object} header Conversation header container element.\n     * @param {Object} body Conversation body container element.\n     * @param {Object} footer Conversation footer container element.\n     * @param {Object|Number|null} conversationOrId Conversation or id or null\n     * @param {String} action An action to take on the conversation\n     * @param {Number} otherUserId The other user id for a private conversation\n     * @return {Object} jQuery promise\n     */\n    var show = function(namespace, header, body, footer, conversationOrId, action, otherUserId) {\n        var conversation = null;\n        var conversationId = null;\n\n        // Check what we were given to identify the conversation.\n        if (conversationOrId && conversationOrId !== null && typeof conversationOrId == 'object') {\n            conversation = conversationOrId;\n            conversationId = parseInt(conversation.id, 10);\n        } else {\n            conversation = null;\n            conversationId = parseInt(conversationOrId, 10);\n            conversationId = isNaN(conversationId) ? null : conversationId;\n        }\n\n        if (!conversationId && action && otherUserId) {\n            // If we didn't get a conversation id got a user id then let's see if we've\n            // previously loaded a private conversation with this user.\n            conversationId = getCachedPrivateConversationIdFromUserId(otherUserId);\n        }\n\n        // This is a new conversation if:\n        // 1. We don't already have a state\n        // 2. The given conversation doesn't match the one currently loaded\n        // 3. We have a view state without a conversation id and we weren't given one\n        //    but we were given a different other user id. This happens when the user\n        //    goes from viewing a user that they haven't yet initialised a conversation\n        //    with to viewing a different user that they also haven't initialised a\n        //    conversation with.\n        var isNewConversation = !viewState || (viewState.id != conversationId) || (otherUserId && otherUserId != getOtherUserId());\n\n        if (!body.attr('data-init')) {\n            // Generate the render function to bind the header, body, and footer\n            // elements to it so that we don't need to pass them around this module.\n            render = generateRenderFunction(header, body, footer, isNewConversation);\n            registerEventListeners(namespace, header, body, footer);\n            body.attr('data-init', true);\n        }\n\n        if (isNewConversation) {\n            var renderPromise = null;\n            var loggedInUserProfile = getLoggedInUserProfile(body);\n\n            if (conversation) {\n                renderPromise = resetByConversation(body, conversation, loggedInUserProfile, otherUserId);\n            } else if (conversationId) {\n                renderPromise = resetById(body, conversationId, loggedInUserProfile, otherUserId);\n            } else {\n                renderPromise = resetNoConversation(body, loggedInUserProfile, otherUserId);\n            }\n\n            return renderPromise\n                .then(function() {\n                    isResetting = false;\n                    // Focus the first element that can receieve it in the header.\n                    header.find(Constants.SELECTORS.CAN_RECEIVE_FOCUS).first().focus();\n                    return;\n                })\n                .catch(function(error) {\n                    isResetting = false;\n                    Notification.exception(error);\n                });\n        }\n\n        // We're not loading a new conversation so we should reset the poll timer to try to load\n        // new messages.\n        resetMessagePollTimer(conversationId);\n\n        if (viewState.type == CONVERSATION_TYPES.PRIVATE && action) {\n            // There are special actions that the user can perform in a private (aka 1-to-1)\n            // conversation.\n            var currentOtherUserId = getOtherUserId();\n\n            switch (action) {\n                case 'block':\n                    return requestBlockUser(currentOtherUserId);\n                case 'unblock':\n                    return requestUnblockUser(currentOtherUserId);\n                case 'add-contact':\n                    return requestAddContact(currentOtherUserId);\n                case 'remove-contact':\n                    return requestRemoveContact(currentOtherUserId);\n            }\n        }\n\n        // Final fallback to return a promise if we didn't need to do anything.\n        return $.Deferred().resolve().promise();\n    };\n\n    /**\n     * String describing this page used for aria-labels.\n     *\n     * @return {Object} jQuery promise\n     */\n    var description = function() {\n        return Str.get_string('messagedrawerviewconversation', 'core_message', viewState.name);\n    };\n\n    return {\n        show: show,\n        description: description\n    };\n});\n"],"file":"message_drawer_view_conversation.min.js"}