/**
 * EGroupware eTemplate2 - JS Diff object
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link http://www.egroupware.org
 * @author Nathan Gray
 * @copyright Nathan Gray 2012
 * @version $Id$
 */

"use strict";

/*egw:uses
	jquery.jquery;
	jquery.jquery-ui;
	lib/jsdifflib/difflib;
	lib/jsdifflib/diffview;
	et2_core_valueWidget;
*/

/**
 * Class that displays the diff between two [text] values
 * 
 * @augments et2_valueWidget
 */ 
var et2_diff = et2_valueWidget.extend([et2_IDetachedDOM], 
{
	attributes: {
		"value": {
			"type": "any"
		}
	},
	
	/**
	 * Constructor
	 * 
	 * @memberOf et2_diff
	 */
	init: function() {
		this._super.apply(this, arguments);
		this.mini = true;

		this.egw().includeCSS('etemplate/js/lib/jsdifflib/diffview.css');
		this.div = document.createElement("div");
		jQuery(this.div).addClass('diff');
	},

	set_value: function(value) {
		jQuery(this.div).empty();
		if(value['old'] && value['new']) {
			// Build diff
			var old_text = difflib.stringAsLines(value['old'].toString());
			var new_text = difflib.stringAsLines(value['new'].toString());
			var sm = new difflib.SequenceMatcher(old_text, new_text);
			var opcodes = sm.get_opcodes();
			var view = diffview.buildView({
				baseTextLines: old_text,
				newTextLines: new_text,
				opcodes: opcodes,
				baseTextName: '',//this.egw().lang('Old value'),
				newTextName: '',//this.egw().lang('New value'),
				viewType: 1
			});
			jQuery(this.div).append(view);
			if(this.mini) {
				view = jQuery(view);
				this.minify(view);
				var self = this;
				jQuery('<span class="ui-icon ui-icon-circle-plus">&nbsp;</span>')
					.appendTo(self.div)
					.css("cursor", "pointer")
					.click({diff: view, div: self.div}, function(e) {
						var diff = e.data.diff;
						var div = e.data.div;
						self.un_minify(diff);
						var dialog_div = jQuery('<div>')
							.append(diff);
						dialog_div.dialog({
							title: self.options.label,
							width: 'auto',
							autoResize: true,
							modal: true,
							buttons: [{text: self.egw().lang('ok'), click: function() {jQuery(this).dialog("close");}}],
							close: function(event, ui) {
								// Need to destroy the dialog, etemplate widget needs divs back where they were
								dialog_div.dialog("destroy");
								self.minify(this);

								// Put it back where it came from, or et2 will error when clear() is called
								diff.prependTo(div);
							}
						});
					});
			}
		}
		else if(typeof value != 'object')
		{
			jQuery(this.div).append(value);
		}
	},

	set_label: function(_label) {
		this.options.label = _label;
		
	},

	/**
	 * Make the diff into a mini-diff
	 */
	minify: function(view) {
		view = jQuery(view)
			.addClass('mini')
			// Dialog changes these, if resized
			.width('100%').css('height', 'inherit')
			.show();
		jQuery('th', view).hide();
		jQuery('td.equal',view).hide()
			.prevAll().hide();
	},

	un_minify: function(view) {
		jQuery(view).removeClass('mini').show();
		jQuery('th',view).show();
		jQuery('td.equal',view).show();
	},

	/**
         * Code for implementing et2_IDetachedDOM 
         * Fast-clonable read-only widget that only deals with DOM nodes, not the widget tree
         */

        /**
         * Build a list of attributes which can be set when working in the
         * "detached" mode in the _attrs array which is provided
         * by the calling code.
         */
        getDetachedAttributes: function(_attrs) {
                _attrs.push("value", "label");
        },

        /**
         * Returns an array of DOM nodes. The (relativly) same DOM-Nodes have to be
         * passed to the "setDetachedAttributes" function in the same order.
         */
        getDetachedNodes: function() {
                return [this.div];
        },

        /**
         * Sets the given associative attribute->value array and applies the
         * attributes to the given DOM-Node.
         *
         * @param _nodes is an array of nodes which has to be in the same order as
         *      the nodes returned by "getDetachedNodes"
         * @param _values is an associative array which contains a subset of attributes
         *      returned by the "getDetachedAttributes" function and sets them to the
         *      given values.
         */
        setDetachedAttributes: function(_nodes, _values) {
		this.div = _nodes[0];
		if(typeof _values['label'] != 'undefined')
		{
			this.set_label(_values['label']);
		}
		if(typeof _values['value'] != 'undefined')
		{
			this.set_value(_values['value']);
		}
	}
});
et2_register_widget(et2_diff, ["diff"]);