var Cloudflare = {
    params: {},

    setParams: function (params) {
        ['api_endpoint', 'token', 'zone'].forEach(function (field) {
            if (typeof params !== 'object' || typeof params[field] === 'undefined'
                    || params[field] === '') {
                throw 'Required param is not set: "' + field + '".';
            }
        });

        Cloudflare.params = params;
        if (typeof Cloudflare.params.api_endpoint === 'string') {
            if (!Cloudflare.params.api_endpoint.endsWith('/')) {
                Cloudflare.params.api_endpoint += '/';
            }
        }
    },

    request: function (method, query, data) {
        var response,
            request = new HttpRequest(),
            url = Cloudflare.params.api_endpoint + query;

        request.addHeader('Content-Type: application/json');
        request.addHeader('Authorization: Bearer ' + Cloudflare.params.token);

        if (typeof data !== 'undefined') {
            data = JSON.stringify(data);
        }

        Zabbix.log(4, '[ Cloudflare ] Sending request: ' + url + ((typeof data === 'string') ? ('\n' + data) : ''));

        switch (method) {
            case 'get':
                response = request.get(url, data);
                break;

            case 'post':
                response = request.post(url, data);
                break;

            default:
                throw 'Unsupported HTTP request method: ' + method;
        }

        Zabbix.log(4, '[ Cloudflare ] Received response with status code ' + request.getStatus() + ': ' + response);

        if (request.getStatus() < 200 || request.getStatus() >= 300) {
            throw 'Request failed with status code ' + request.getStatus() + ': ' + response;
        }

        if (response !== null) {
            try {
                response = JSON.parse(response);
            }
            catch (error) {
                throw 'Failed to parse response received from Cloudflare. Check debug log for more information.';
            }
        }

        if (query === 'graphql/' && request.getStatus() == 200 && typeof response.errors !== 'undefined'
                && Array.isArray(response.errors)) {
            throw 'Request failed with error "' + (getField(response, 'errors.0.message') || 'unknown') + '"';
        }

        return {
            status: request.getStatus(),
            response: response
        };
    }
}

function getField(object, field, def) {
    var names = field.split('.');
    var name = names.shift();

    while (typeof name !== 'undefined') {
        if (typeof object === undefined || typeof object[name] === 'undefined') {
            return def;
        }

        object = object[name];
        name = names.shift();
    }

    return object;
}

try {
    Cloudflare.setParams(JSON.parse(value));

    var datetime_end = new Date(),
        datetime_start = new Date();

    datetime_start.setTime(datetime_end.getTime() - 3600000);
    datetime_start.setMinutes(0, 0, 0);
    datetime_end.setTime(datetime_start.getTime());
    datetime_end.setMinutes(59, 59, 0);

    var datetime_start_str = datetime_start.toISOString(),
        datetime_end_str = datetime_end.toISOString();

    var data = {
        "query": "{viewer {zones(filter: {zoneTag: " + Cloudflare.params.zone + "}) {\
        httpRequests1hGroups(limit: 100 filter: {\
            datetime_geq: \"" + datetime_start_str + "\",  datetime_leq: \"" + datetime_end_str + "\"\
            }) {\
                sum{\
                    requests\
                    cachedRequests\
                    encryptedRequests\
                    responseStatusMap{ requests edgeResponseStatus }\
                    bytes\
                    cachedBytes\
                    encryptedBytes\
                    threats\
                    pageViews\
                }\
                uniq{uniques}\
                }\
            }}}", "variables": {}
    }
    var result = Cloudflare.request('post', 'graphql/', data),
        cloudflare = {},
        res = getField(result.response, 'data.viewer.zones.0.httpRequests1hGroups.0.sum');

    if (typeof res === 'object') {
        cloudflare = {
            requests: {
                all: res.requests || 0,
                cached: res.cachedRequests || 0,
                encrypted: res.encryptedRequests || 0,
                cache_hit_ratio: 0,
                success_ratio: 0,
                others_ratio: 0,
                response_100: 0,
                response_200: 0,
                response_300: 0,
                response_400: 0,
                response_500: 0
            },
            bandwidth: {
                all: res.bytes || 0,
                cached: res.cachedBytes || 0,
                cache_hit_ratio: 0,
                encrypted: res.encryptedBytes || 0,
            },
            threats: {
                all: res.threats || 0
            },
            pageviews: {
                all: res.pageViews || 0
            }
        }

        cloudflare.requests.uncached = res.requests - res.cachedRequests;
        cloudflare.requests.unencrypted = cloudflare.requests.all - cloudflare.requests.encrypted;
        cloudflare.bandwidth.uncached = cloudflare.bandwidth.all - cloudflare.bandwidth.cached;
        cloudflare.bandwidth.unencrypted = cloudflare.bandwidth.all - cloudflare.bandwidth.encrypted;

        if (Array.isArray(res.responseStatusMap)) {
            res.responseStatusMap.forEach(function (element) {
                var group = Math.floor((element.edgeResponseStatus / 100)) * 100;
                cloudflare.requests['response_' + group] += element.requests;
            });
        }

        if (cloudflare.requests.all > 0) {
            cloudflare.requests.success_ratio = (cloudflare.requests.response_200
                / cloudflare.requests.all * 100).toFixed(2);
            cloudflare.requests.others_ratio = ((cloudflare.requests.all - cloudflare.requests.response_200)
                / cloudflare.requests.all * 100).toFixed(2);
            cloudflare.requests.cache_hit_ratio = (cloudflare.requests.cached
                / cloudflare.requests.all * 100).toFixed(2);
        }

        if (cloudflare.bandwidth.all > 0) {
            cloudflare.bandwidth.cache_hit_ratio = (cloudflare.bandwidth.cached / cloudflare.bandwidth.all * 100).toFixed(2);
        }

        res = getField(result.response, 'data.viewer.zones.0.httpRequests1hGroups.0.uniq');

        if (typeof res === 'object') {
            cloudflare.uniques = {
                all: res.uniques || 0
            }
        }

        result = Cloudflare.request('get', 'zones/' + encodeURIComponent(Cloudflare.params.zone)
            + '/dns_analytics/report?dimensions=queryName&metrics=queryCount,uncachedCount,staleCount&since='
            + encodeURIComponent(datetime_start_str) + '&until=' + encodeURIComponent(datetime_end_str));

        res = getField(result.response, 'result.totals');

        if (typeof result.response.result === 'object') {
            cloudflare.dns = {
                query: {
                    all: res.queryCount || 0,
                    uncached: res.uncachedCount || 0,
                    stale: res.staleCount || 0
                }
            }
        }
    }

    return JSON.stringify(cloudflare);
}
catch (error) {
    error += (String(error).endsWith('.')) ? '' : '.';
    Zabbix.log(3, '[ Cloudflare ] ERROR: ' + error);
    throw 'Requesting failed: ' + error;
}