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// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Comment Helper
 * @author Dongsheng Cai <dongsheng@moodle.com>
 */
M.core_comment = {
    /**
     * Initialize commenting system
     */
    init: function(Y, options) {
        var CommentHelper = function(args) {
            CommentHelper.superclass.constructor.apply(this, arguments);
        };
        CommentHelper.NAME = "COMMENT";
        CommentHelper.ATTRS = {
            options: {},
            lang: {}
        };
        Y.extend(CommentHelper, Y.Base, {
            api: M.cfg.wwwroot+'/comment/comment_ajax.php',
            initializer: function(args) {
                var scope = this;
                this.client_id = args.client_id;
                this.itemid = args.itemid;
                this.commentarea = args.commentarea;
                this.component = args.component;
                this.courseid = args.courseid;
                this.contextid = args.contextid;
                this.autostart = (args.autostart);
                // expand comments?
                if (this.autostart) {
                    this.view(args.page);
                }
                // load comments
                var handle = Y.one('#comment-link-'+this.client_id);
                // hide toggle link
                if (handle) {
                    if (args.notoggle) {
                        handle.setStyle('display', 'none');
                    }
                    handle.on('click', function(e) {
                        e.preventDefault();
                        this.view(0);
                        return false;
                    }, this);
                    // Also handle space/enter key.
                    handle.on('key', function(e) {
                        e.preventDefault();
                        this.view(0);
                        return false;
                    }, '13,32', this);
                }
                scope.toggle_textarea(false);
            },
            post: function() {
                var ta = Y.one('#dlg-content-'+this.client_id);
                var scope = this;
                var value = ta.get('value');
                if (value && value != M.util.get_string('addcomment', 'moodle')) {
                    ta.set('disabled', true);
                    ta.setStyles({
                        'backgroundImage': 'url(' + M.util.image_url('i/loading_small', 'core') + ')',
                        'backgroundRepeat': 'no-repeat',
                        'backgroundPosition': 'center center'
                    });
                    var params = {'content': value};
                    this.request({
                        action: 'add',
                        scope: scope,
                        params: params,
                        callback: function(id, obj, args) {
                            var scope = args.scope;
                            var cid = scope.client_id;
                            var ta = Y.one('#dlg-content-'+cid);
                            ta.set('value', '');
                            ta.set('disabled', false);
                            ta.setStyle('backgroundImage', 'none');
                            scope.toggle_textarea(false);
                            var container = Y.one('#comment-list-'+cid);
                            var result = scope.render([obj], true);
                            var newcomment = Y.Node.create(result.html);
                            container.appendChild(newcomment);
                            var ids = result.ids;
                            var linkText = Y.one('#comment-link-text-' + cid);
                            if (linkText) {
                                linkText.set('innerHTML', M.util.get_string('commentscount', 'moodle', obj.count));
                            }
                            for(var i in ids) {
                                var attributes = {
                                    color: { to: '#06e' },
                                    backgroundColor: { to: '#FFE390' }
                                };
                                var anim = new Y.YUI2.util.ColorAnim(ids[i], attributes);
                                anim.animate();
                            }
                            scope.register_pagination();
                            scope.register_delete_buttons();
                        }
                    }, true);
                } else {
                    var attributes = {
                        backgroundColor: { from: '#FFE390', to:'#FFFFFF' }
                    };
                    var anim = new Y.YUI2.util.ColorAnim('dlg-content-'+cid, attributes);
                    anim.animate();
                }
            },
            request: function(args, noloading) {
                var params = {};
                var scope = this;
                if (args['scope']) {
                    scope = args['scope'];
                }
                //params['page'] = args.page?args.page:'';
                // the form element only accept certain file types
                params['sesskey']   = M.cfg.sesskey;
                params['action']    = args.action?args.action:'';
                params['client_id'] = this.client_id;
                params['itemid']    = this.itemid;
                params['area']      = this.commentarea;
                params['courseid']  = this.courseid;
                params['contextid'] = this.contextid;
                params['component'] = this.component;
                if (args['params']) {
                    for (i in args['params']) {
                        params[i] = args['params'][i];
                    }
                }
                var cfg = {
                    method: 'POST',
                    on: {
                        complete: function(id,o,p) {
                            if (!o) {
                                alert('IO FATAL');
                                return false;
                            }
                            var data = Y.JSON.parse(o.responseText);
                            if (data.error) {
                                if (data.error == 'require_login') {
                                    args.callback(id,data,p);
                                    return true;
                                }
                                alert(data.error);
                                return false;
                            } else {
                                args.callback(id,data,p);
                                return true;
                            }
                        }
                    },
                    arguments: {
                        scope: scope
                    },
                    headers: {
                        'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
                    },
                    data: build_querystring(params)
                };
                if (args.form) {
                    cfg.form = args.form;
                }
                Y.io(this.api, cfg);
                if (!noloading) {
                    this.wait();
                }
            },
            render: function(list, newcmt) {
                var ret = {};
                ret.ids = [];
                var template = Y.one('#cmt-tmpl');
                var html = '';
                for(var i in list) {
                    var htmlid = 'comment-'+list[i].id+'-'+this.client_id;
                    var val = template.get('innerHTML');
                    if (list[i].profileurl) {
                        val = val.replace('___name___', '<a href="'+list[i].profileurl+'">'+list[i].fullname+'</a>');
                    } else {
                        val = val.replace('___name___', list[i].fullname);
                    }
                    if (list[i]['delete']||newcmt) {
                        var tokens = {
                            user: list[i].fullname,
                            time: list[i].time
                        };
                        var deleteStr = Y.Escape.html(M.util.get_string('deletecommentbyon', 'moodle', tokens));
                        list[i].content = '<div class="comment-delete">' +
                            '<a href="#" role="button" id ="comment-delete-' + this.client_id + '-' + list[i].id + '"' +
                            '   title="' + deleteStr + '">' +
                            '<span></span>' +
                            '</a>' +
                            '</div>' + list[i].content;
                    }
                    val = val.replace('___time___', list[i].time);
                    val = val.replace('___picture___', list[i].avatar);
                    val = val.replace('___content___', list[i].content);
                    val = '<li id="'+htmlid+'">'+val+'</li>';
                    ret.ids.push(htmlid);
                    html = (val+html);
                }
                ret.html = html;
                return ret;
            },
            load: function(page) {
                var scope = this;
                var container = Y.one('#comment-ctrl-'+this.client_id);
                var params = {
                    'action': 'get',
                    'page': page
                };
                this.request({
                    scope: scope,
                    params: params,
                    callback: function(id, ret, args) {
                        var linkText = Y.one('#comment-link-text-' + scope.client_id);
                        if (ret.count && linkText) {
                            linkText.set('innerHTML', M.util.get_string('commentscount', 'moodle', ret.count));
                        }
                        var container = Y.one('#comment-list-'+scope.client_id);
                        var pagination = Y.one('#comment-pagination-'+scope.client_id);
                        if (ret.pagination) {
                            pagination.set('innerHTML', ret.pagination);
                        } else {
                            //empty paging bar
                            pagination.set('innerHTML', '');
                        }
                        if (ret.error == 'require_login') {
                            var result = {};
                            result.html = M.util.get_string('commentsrequirelogin', 'moodle');
                        } else {
                            var result = scope.render(ret.list);
                        }
                        container.set('innerHTML', result.html);
                        var img = Y.one('#comment-img-'+scope.client_id);
                        if (img) {
                            img.set('src', M.util.image_url('t/expanded', 'core'));
                        }
                        args.scope.register_pagination();
                        args.scope.register_delete_buttons();
                    }
                });
            },

dodelete: function(id) { // note: delete is a reserved word in javascript, chrome and safary do not like it at all here!
                var scope = this,
                    cid = scope.client_id,
                    params = {'commentid': id};
                function remove_dom(type, anim, cmt) {
                    cmt.remove();
                    var linkText = Y.one('#comment-link-text-' + cid),
                        comments = Y.all('#comment-list-' + cid + ' li');
                    if (linkText && comments) {
                        linkText.set('innerHTML', M.util.get_string('commentscount', 'moodle', comments.size()));
                    }
                }
                this.request({
                    action: 'delete',
                    scope: scope,
                    params: params,
                    callback: function(id, resp, args) {
                        var htmlid= 'comment-'+resp.commentid+'-'+resp.client_id;
                        var attributes = {
                            width:{to:0},
                            height:{to:0}
                        };
                        var cmt = Y.one('#'+htmlid);
                        cmt.setStyle('overflow', 'hidden');
                        var anim = new Y.YUI2.util.Anim(htmlid, attributes, 1, Y.YUI2.util.Easing.easeOut);
                        anim.onComplete.subscribe(remove_dom, cmt, this);
                        anim.animate();
                    }
                }, true);
            },
            register_actions: function() {
                // add new comment
                var action_btn = Y.one('#comment-action-post-'+this.client_id);
                if (action_btn) {
                    action_btn.on('click', function(e) {
                        e.preventDefault();
                        this.post();
                        return false;
                    }, this);
                }
                // cancel comment box
                var cancel = Y.one('#comment-action-cancel-'+this.client_id);
                if (cancel) {
                    cancel.on('click', function(e) {
                        e.preventDefault();
                        this.view(0);
                        return false;
                    }, this);
                }
            },
            register_delete_buttons: function() {
                var scope = this;
                // page buttons
                Y.all('div.comment-delete a').each(
                    function(node, id) {
                        var theid = node.get('id');
                        var parseid = new RegExp("comment-delete-"+scope.client_id+"-(\\d+)", "i");
                        var commentid = theid.match(parseid);
                        if (!commentid) {
                            return;
                        }
                        if (commentid[1]) {
                            Y.Event.purgeElement('#'+theid, false, 'click');
                        }
                        node.on('click', function(e) {
                            e.preventDefault();
                            if (commentid[1]) {
                                scope.dodelete(commentid[1]);
                            }
                        });
                        // Also handle space/enter key.
                        node.on('key', function(e) {
                            e.preventDefault();
                            if (commentid[1]) {
                                scope.dodelete(commentid[1]);
                            }
                        }, '13,32');
                        // 13 and 32 are the keycodes for space and enter.

require(['core/templates', 'core/notification'], function(Templates, Notification) {
                            var title = node.getAttribute('title');
                            Templates.renderPix('t/delete', 'core', title).then(function(html) {
                                node.set('innerHTML', html);
                            }).catch(Notification.exception);
                        });
                    }
                );
            },
            register_pagination: function() {
                var scope = this;
                // page buttons
                Y.all('#comment-pagination-'+this.client_id+' a').each(
                    function(node, id) {
                        node.on('click', function(e, node) {
                            e.preventDefault();
                            var id = node.get('id');
                            var re = new RegExp("comment-page-"+this.client_id+"-(\\d+)", "i");
                            var result = id.match(re);
                            this.load(result[1]);
                        }, scope, node);
                    }
                );
            },
            view: function(page) {
                var commenttoggler = Y.one('#comment-link-' + this.client_id);
                var container = Y.one('#comment-ctrl-'+this.client_id);
                var ta = Y.one('#dlg-content-'+this.client_id);
                var img = Y.one('#comment-img-'+this.client_id);
                var d = container.getStyle('display');
                if (d=='none'||d=='') {
                    // show
                    if (!this.autostart) {
                        this.load(page);
                    } else {
                        this.register_delete_buttons();
                        this.register_pagination();
                    }
                    container.setStyle('display', 'block');
                    if (img) {
                        img.set('src', M.util.image_url('t/expanded', 'core'));
                    }
                    if (commenttoggler) {
                        commenttoggler.setAttribute('aria-expanded', 'true');
                    }
                } else {
                    // hide
                    container.setStyle('display', 'none');
                    var collapsedimage = 't/collapsed'; // ltr mode
                    if ( Y.one(document.body).hasClass('dir-rtl') ) {
                        collapsedimage = 't/collapsed_rtl';
                    } else {
                        collapsedimage = 't/collapsed';
                    }
                    if (img) {
                        img.set('src', M.util.image_url(collapsedimage, 'core'));
                    }
                    if (ta) {
                        ta.set('value','');
                    }
                    if (commenttoggler) {
                        commenttoggler.setAttribute('aria-expanded', 'false');
                    }
                }
                if (ta) {
                    //toggle_textarea.apply(ta, [false]);
                    //// reset textarea size
                    ta.on('focus', function() {
                        this.toggle_textarea(true);
                    }, this);
                    //ta.onkeypress = function() {
                        //if (this.scrollHeight > this.clientHeight && !window.opera)
                            //this.rows += 1;
                    //}
                    ta.on('blur', function() {
                        this.toggle_textarea(false);
                    }, this);
                }
                this.register_actions();
                return false;
            },
            toggle_textarea: function(focus) {
                var t = Y.one('#dlg-content-'+this.client_id);
                if (!t) {
                    return false;
                }
                if (focus) {
                    if (t.get('value') == M.util.get_string('addcomment', 'moodle')) {
                        t.set('value', '');
                        t.setStyle('color', 'black');
                    }
                }else{
                    if (t.get('value') == '') {
                        t.set('value', M.util.get_string('addcomment', 'moodle'));
                        t.setStyle('color','grey');
                        t.set('rows', 2);
                    }
                }
            },
            wait: function() {
                var container = Y.one('#comment-list-'+this.client_id);
                container.set('innerHTML', '<div class="mdl-align"><img src="'+M.util.image_url('i/loading_small', 'core')+'" /></div>');
            }
        });

new CommentHelper(options);
    },
    init_admin: function(Y) {
        var select_all = Y.one('#comment_select_all');
        if (select_all) {
            select_all.on('click', function(e) {
                var comments = document.getElementsByName('comments');
                var checked = false;
                for (var i in comments) {
                    if (comments[i].checked) {
                        checked=true;
                    }
                }
                for (i in comments) {
                    comments[i].checked = !checked;
                }
                this.set('checked', !checked);
            });
        }