// 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/>.

/**
 * TinyMCE helper javascript functions.
 *
 * @package    editor_tinymce
 * @copyright  2010 Petr Skoda (http://skodak.org)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

M.editor_tinymce = M.editor_tinymce || {};

M.editor_tinymce.editor_options = M.editor_tinymce.options || {};
M.editor_tinymce.filepicker_options = M.editor_tinymce.filepicker_options || {};
M.editor_tinymce.initialised = false;

M.editor_tinymce.init_editor = function(Y, editorid, options) {

    if (!M.editor_tinymce.initialised) {
        // Load all language strings for all plugins - we do not use standard TinyMCE lang pack loading!
        tinymce.ScriptLoader.add(M.cfg.wwwroot + '/lib/editor/tinymce/all_strings.php?elanguage=' + options.language + '&rev=' + options.langrev);

        // Monkey patch for MDL-35284 - this hack ignores empty toolbars.
        tinymce.ui.Toolbar.prototype.oldRenderHTML = tinymce.ui.Toolbar.prototype.renderHTML;
        tinymce.ui.Toolbar.prototype.renderHTML = function() {
            if (this.controls.length == 0) {
                return;
            }
            return tinymce.ui.Toolbar.prototype.oldRenderHTML.call(this);
        };

        M.editor_tinymce.initialised = true;
        M.util.js_pending('editors');
        options.oninit = "M.editor_tinymce.init_callback";
    }

    M.editor_tinymce.editor_options[editorid] = options;

    // Load necessary Moodle plugins into editor.
    if (options.moodle_init_plugins) {
        var extraplugins = options.moodle_init_plugins.split(',');
        for (var i=0; i<extraplugins.length; i++) {
            var filedetails = extraplugins[i].split(':');
            tinyMCE.PluginManager.load(filedetails[0],
                M.cfg.wwwroot + '/lib/editor/tinymce/plugins/' + filedetails[1]);
        }
    }

    // Retain any setup which is already defined.
    options.originalSetupFunction = options.setup || function(){};
    options.setup = function(editor) {
        options.originalSetupFunction();
        editor.onChange.add(function(ed) {
            ed.save();
        });
        Y.use('event', 'moodle-core-event', function(Y) {
            var form = Y.one(document.getElementById(editor.id)).ancestor('form');
            if (form) {
                form.on(M.core.event.FORM_SUBMIT_AJAX, function() {
                    editor.save();
                }, this);
            }
        });
    };

    tinyMCE.init(options);

    var item = document.getElementById(editorid+'_filemanager');
    if (item) {
        item.parentNode.removeChild(item);
    }

    document.getElementById(editorid).addEventListener('form:editorUpdated', function() {
        M.editor_tinymce.updateEditorState(editorid);
    });
};

M.editor_tinymce.init_callback = function() {
    M.util.js_complete('editors');
}

M.editor_tinymce.init_filepicker = function(Y, editorid, options) {
    M.editor_tinymce.filepicker_options[editorid] = options;
};

M.editor_tinymce.toggle = function(id) {
    tinyMCE.execCommand('mceToggleEditor', false, id);
};

/**
 * Update the state of the editor.
 * @param {String} id
 */
M.editor_tinymce.updateEditorState = function(id) {
    var instance = window.tinyMCE.get(id),
        content = instance.getBody(),
        controls = instance.controlManager.controls,
        disabled = instance.getElement().readOnly;
    // Enable/Disable all plugins.
    for (var key in controls) {
        if (controls.hasOwnProperty(key)) {
            controls[key].setDisabled(disabled);
        }
    }
    // Enable/Disable body content.
    content.setAttribute('contenteditable', !disabled);
};

M.editor_tinymce.filepicker_callback = function(args) {
};

M.editor_tinymce.filepicker = function(target_id, url, type, win) {
    YUI().use('core_filepicker', function (Y) {
        var editor_id = tinyMCE.selectedInstance.editorId;
        if (editor_id == 'mce_fullscreen') {
            editor_id = tinyMCE.selectedInstance.settings.elements;
        }
        var options = null;
        if (type == 'media') {
            // When media button clicked.
            options = M.editor_tinymce.filepicker_options[editor_id]['media'];
        } else if (type == 'file') {
            // When link button clicked.
            options = M.editor_tinymce.filepicker_options[editor_id]['link'];
        } else if (type == 'image') {
            // When image button clicked.
            options = M.editor_tinymce.filepicker_options[editor_id]['image'];
        }

        options.formcallback = M.editor_tinymce.filepicker_callback;
        options.editor_target = win.document.getElementById(target_id);

        M.core_filepicker.show(Y, options);
    });
};

M.editor_tinymce.onblur_event = function(ed) {
    // Attach event only after tinymce is initialized.
    if (ed.onInit != undefined) {
        var s = ed.settings;
        // Save before event is attached, so that if this event is not generated then textarea should
        // have loaded contents and submitting form should not throw error.
        ed.save();

        // Attach blur event for tinymce to save contents to textarea.
        var doc = s.content_editable ? ed.getBody() : (tinymce.isGecko ? ed.getDoc() : ed.getWin());
        tinymce.dom.Event.add(doc, 'blur', function() {
            // Save contents to textarea before calling validation script.
            ed.save();
        });
    };
};