// Copyright (c) 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/accessibility/browser_accessibility_manager_auralinux.h"

#include <atk/atk.h>

#include "content/browser/accessibility/browser_accessibility.h"
#include "content/browser/accessibility/browser_accessibility_manager.h"
#include "content/browser/accessibility/test_browser_accessibility_delegate.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/platform/ax_platform_node.h"
#include "ui/accessibility/platform/ax_platform_node_auralinux.h"

namespace content {

class BrowserAccessibilityManagerAuraLinuxTest : public testing::Test {
 public:
  BrowserAccessibilityManagerAuraLinuxTest() = default;
  ~BrowserAccessibilityManagerAuraLinuxTest() override = default;

 protected:
  std::unique_ptr<TestBrowserAccessibilityDelegate>
      test_browser_accessibility_delegate_;

 private:
  void SetUp() override;

  DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerAuraLinuxTest);
};

void BrowserAccessibilityManagerAuraLinuxTest::SetUp() {
  ui::AXPlatformNode::NotifyAddAXModeFlags(ui::kAXModeComplete);
  test_browser_accessibility_delegate_ =
      std::make_unique<TestBrowserAccessibilityDelegate>();
}

TEST_F(BrowserAccessibilityManagerAuraLinuxTest, TestEmitChildrenChanged) {
  ui::AXTreeUpdate initial_state;
  ui::AXTreeID tree_id = ui::AXTreeID::CreateNewAXTreeID();
  initial_state.tree_data.tree_id = tree_id;
  initial_state.has_tree_data = true;
  initial_state.tree_data.loaded = true;
  initial_state.root_id = 1;
  initial_state.nodes.resize(3);
  initial_state.nodes[0].id = 1;
  initial_state.nodes[0].child_ids = {2};
  initial_state.nodes[0].role = ax::mojom::Role::kRootWebArea;
  initial_state.nodes[1].id = 2;
  initial_state.nodes[1].child_ids = {3};
  initial_state.nodes[1].role = ax::mojom::Role::kStaticText;
  initial_state.nodes[2].id = 3;
  initial_state.nodes[2].role = ax::mojom::Role::kInlineTextBox;

  std::unique_ptr<BrowserAccessibilityManager> manager(
      BrowserAccessibilityManager::Create(
          initial_state, test_browser_accessibility_delegate_.get()));

  AtkObject* atk_root = manager->GetRoot()->GetNativeViewAccessible();
  ui::AXPlatformNodeAuraLinux* root_document_root_node =
      static_cast<ui::AXPlatformNodeAuraLinux*>(
          ui::AXPlatformNode::FromNativeViewAccessible(atk_root));
  g_signal_connect(atk_root, "children-changed::remove",
                   G_CALLBACK(+[](AtkObject* obj, int index, gpointer child,
                                  gpointer user_data) {
                     EXPECT_EQ(ATK_ROLE_DOCUMENT_WEB, atk_object_get_role(obj));
                   }),
                   nullptr);
  g_signal_connect(atk_root, "children-changed::add",
                   G_CALLBACK(+[](AtkObject* obj, int index, gpointer child,
                                  gpointer user_data) {
                     EXPECT_EQ(ATK_ROLE_DOCUMENT_WEB, atk_object_get_role(obj));
                   }),
                   nullptr);
  BrowserAccessibility* static_text_accessible =
      manager->GetRoot()->PlatformGetChild(0);
  // StaticText node triggers 'children-changed' event to the parent,
  // ATK_ROLE_DOCUMENT_WEB, when subtree is changed.
  BrowserAccessibilityManagerAuraLinux* aura_linux_manager =
      manager->ToBrowserAccessibilityManagerAuraLinux();
  aura_linux_manager->FireSubtreeCreatedEvent(static_text_accessible);
  aura_linux_manager->OnSubtreeWillBeDeleted(manager->ax_tree(),
                                             static_text_accessible->node());

  AtkObject* atk_object = root_document_root_node->ChildAtIndex(0);
  g_signal_connect(atk_object, "children-changed::remove",
                   G_CALLBACK(+[](AtkObject*, int index, gpointer child,
                                  gpointer user_data) {
                     EXPECT_TRUE(false) << "should not be reached.";
                   }),
                   nullptr);
  g_signal_connect(atk_object, "children-changed::add",
                   G_CALLBACK(+[](AtkObject* obj, int index, gpointer child,
                                  gpointer user_data) {
                     EXPECT_TRUE(false) << "should not be reached.";
                   }),
                   nullptr);

  BrowserAccessibility* inline_text_accessible =
      static_text_accessible->PlatformGetChild(0);
  // PlatformLeaf node such as InlineText should not trigger
  // 'children-changed' event to the parent when subtree is changed.
  aura_linux_manager->FireSubtreeCreatedEvent(inline_text_accessible);
  aura_linux_manager->OnSubtreeWillBeDeleted(manager->ax_tree(),
                                             inline_text_accessible->node());
}

}  // namespace content