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/*
 * @link https://www.humhub.org/
 * @copyright Copyright (c) 2018 HumHub GmbH & Co. KG
 * @license https://www.humhub.com/licences
 *
 */

/**do
 * Core module for managing Streams and StreamItems
 * @type Function
 */

humhub.module('stream.StreamRequest', function (module, require, $) {

    var util = require('util');
    var object = util.object;
    var client = require('client');

    /**
     * The stream request is responsible for sending stream entry requests and forwarding the result.
     *
     * Available options:
     *
     *  - url: Used as stream request url, if not given the url is fetched from the stream root element by means of the data-stream.
     *  - limit: Used to limit the result of a request if not given a module default is used
     *  - from: First content id which should be included in the result if not provided, the stream state is used
     *  - contentId: Used to load a single entry with a given id
     *  - loader: Weather or not triggering the stream loader for this request (default: true)
     *  - suppressionsOnly: Used for reloading suppressed entries
     *
     * @param stream
     * @param options
     * @constructor
     */
    var StreamRequest = function(stream, options) {
        this.options = options || {};
        this.stream = stream;
        this.stream.request = this;
        this.initOptions(options);
    };

    StreamRequest.prototype.initOptions = function(options) {
        this.contentId = this.options.contentId;
        if (this.options.commentId) {
            this.commentId = this.options.commentId;
        }
        this.viewContext = this.options.viewContext;
        this.loader = object.defaultValue(this.options.loader, !object.isDefined(this.options.insertAfter));
        this.url = object.defaultValue(this.options.url, this.stream.options.stream);
        this.limit = object.defaultValue(this.options.limit, this.stream.options.loadCount);
        if(!object.isDefined(this.options.to)) {
            this.from = object.defaultValue(this.options.from, this.stream.state.lastContentId);
        } else {
            this.to = this.options.to;
        }
        this.suppressionsOnly = this.options.suppressionsOnly;
        this.channel = this.options.channel;
    };

    StreamRequest.prototype.loadSingle = function(contentId) {
        this.options.contentId = contentId;
        return this.load();
    };

    StreamRequest.prototype.load = function() {
        this.stream.trigger('humhub:stream:beforeLoadEntries', [this.stream, this]);

        if(this.stream.isLoading()) {
            return Promise.resolve();
        }

        if(this.loader) {
            this.stream.loader.show(true);
        }

        this.stream.state.loading = true;
        this.stream.state.lastRequest = this;

        var that = this;
        return that._send().then(function (response) {
            that.response = response;

            if(that.loader) {
                that.stream.loader.show(false);
            }

            that.stream.state.loading = false;
            that.stream.trigger('humhub:stream:afterLoadEntries', [that.stream, this]);
            return that;
        }).finally(function () {
            that.stream.state.loading = false;
        });
    };

    StreamRequest.prototype._send = function () {
        var that = this;
        var stream = this.stream;

        if (stream.currentXhr) {
            stream.currentXhr.abort();
        }

        return client.ajax(this.url, {data:  this.getRequestData(), beforeSend: function (xhr) {
            // Update requests do not interfer with other request
            if(!that.isUpdateRequest()) {
                stream.currentXhr = xhr;
            }
        }}).then(function(response) {
            stream.currentXhr = undefined;
            stream.state.initialized = true;
            return response;
        });
    };

    StreamRequest.prototype.getRequestData = function() {
        var data = {};

        var that = this;

        if(!this.contentId) {
            data[this.buildRequestDataKey('sort')] = this.sort;

            if(!object.isDefined(this.to)) {
                data[this.buildRequestDataKey('from')] = this.from;
            } else {
                data[this.buildRequestDataKey('to')] = this.to;
            }
            data[this.buildRequestDataKey('limit')] = this.limit;
        }

        if(this.viewContext) {
            data['viewContext'] = this.viewContext;
        }

        data[this.buildRequestDataKey('contentId')] = this.contentId;
        if (this.commentId) {
            data[this.buildRequestDataKey('commentId')] = this.commentId;
        }
        data[this.buildRequestDataKey('suppressionsOnly')] = this.suppressionsOnly;

        if(this.options.data) {
            $.each(this.options.data, function(key, value) {
                data[this.buildRequestDataKey(key)] = value;
            });
        }

        $.each(this.stream.filter.getFilterMap(), function(key, value) {
            data[that.buildRequestDataKey(key)] = value;
        });

        return data;
    };

    StreamRequest.prototype.buildRequestDataKey = function(key) {
        return 'StreamQuery['+key+']';
    };

    StreamRequest.prototype.isLastEntryResponse = function () {
        return !this.isSingleEntryRequest() && !this.isUpdateRequest() && object.isEmpty(this.response.content);
    };

    StreamRequest.prototype.getResultHtml = function() {
        var result = '';
        this.forEachResult(function(key, entry, output) {
            result += output;
        });
        return result;
    };

    StreamRequest.prototype.forEachResult = function(handler) {
        var that = this;
        $.each(this.response.contentOrder, function (i, key) {
            handler.call(null, key, that.response.content[key], that.response.content[key].output);
        });
    };

    StreamRequest.prototype.isSingleEntryRequest = function() {
        return !!this.contentId;
    };

    StreamRequest.prototype.isUpdateRequest = function() {
        return !!this.to;
    };

    module.export = StreamRequest;
});

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