/**
 * EGroupware clientside API object
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link http://www.egroupware.org
 * @author Andreas Stöckel (as AT stylite.de)
 * @author Ralf Becker <RalfBecker@outdoor-training.de>
 * @version $Id$
 */

/*egw:uses
	/api/js/jquery/jquery-ui/jquery-ui.js;
	jquery.jquery-ui-timepicker-addon;

	egw_core;
	egw_preferences;
//	egw_jquery;
	egw_css;
*/

/**
 * Date and timepicker
 *
 * @augments Class
 * @param {string} _app application name object is instanciated for
 * @param {object} _wnd window object is instanciated for
 */
egw.extend('calendar', egw.MODULE_WND_LOCAL, function(_app, _wnd)
{
	"use strict";

	// translate only once
	var calendar_translated = false,timepicker_translated = false;

	function calendarPreferences(_egw)
	{
		// Date format in jQuery UI date format
		var dateformat = dateTimeFormat(_egw.preference("dateformat") || "Y-m-d");

		// First day of the week
		var first_day = {"Monday": 1, "Sunday": 0, "Saturday": 6};
		var first_day_pref = _egw.preference("weekdaystarts","calendar");

		return {
			'dateFormat': dateformat,
			'firstDay': first_day_pref ? first_day[first_day_pref] : 0
		};
	};

	/**
	 * transform PHP date/time-format to jQuery date/time-format
	 *
	 * @param {string} _php_format
	 * @returns {string}
	 */
	function dateTimeFormat(_php_format)
	{
		return _php_format
			.replace("Y","yy")
			.replace("d","dd")
			.replace("m","mm")
			.replace("M", "M")
			.replace('H', 'hh')
			.replace('i', 'mm')	// datepicker uses mm for month and minutes, depending where in format it's written!
			.replace('s', 'ss');
	}

	function timePreferences(_egw)
	{
		return {
			// timepicker does NOT work with spaces in timeformat
			"timeFormat": egw.preference("timeformat") == 12 ? "h:mmtt" : "HH:mm",
			"ampm": (egw.preference("timeformat") == "12"),
			"hourGrid": 4,
			"minuteGrid": 10
		};
	};

	function setupCalendar(_egw, _input, _time, _callback, _context)
	{
		if (!calendar_translated)
		{
			// Set template's icon for date popup - could probably use jquery-ui icons
			_egw.css(".et2_date input.hasDatepicker:enabled:hover", "background-image: url(" + egw().image('datepopup') + ")");

			translateCalendar();
			calendar_translated = true;
		}
		if (!timepicker_translated)
		{
			translateTimepicker();
			timepicker_translated = true;
		}
		var prefs = calendarPreferences(_egw);

		var params = {
			dateFormat: prefs.dateFormat,
			firstDay: prefs.firstDay,

			autoSize: true,
			showButtonPanel: true, // Today, Done buttons
			showOtherMonths: true,
			selectOtherMonths: true,
			showWeek: true, // Week numbers
			changeMonth: true, // Month selectbox
			changeYear: true // Year selectbox
		};

		// Get the preferences
		if(_time)
		{
			params = jQuery.extend(params, timePreferences(_egw));
			_wnd.jQuery(_input).datetimepicker(params);
		}
		else
		{
			_wnd.jQuery(_input).datepicker(params);
		}
/*
				onClose:	function(date_text, picker) {
					// Only update if there's a change - "" if no date selected
					if(date_text != "") self.set_value(new Date(
						picker.selectedYear,
						picker.selectedMonth,
						picker.selectedDay,
						self.input_hours ? self.input_hours.val() : 0,
						self.input_minutes ? self.input_minutes.val() : 0,
						0,0
					));
				},
			});

*/
	};

	/**
	 * Set up an input to have a time selection popup
	 *
	 * @param {egw} _egw egw object to use
	 * @param {(node|string)} _input input field to use
	 */
	function setupTime(_egw, _input)
	{
		if (!timepicker_translated)
		{
			translateTimepicker();
			timepicker_translated = true;
		}
		_wnd.jQuery(_input).timepicker(timePreferences(_egw));
	}

	/**
	 * Translate, and set as default values
	 *
	 */
	function translateCalendar()
	{
		var translate_fields = {
			// These ones are simple strings
			"nextText": false,
			"currentText": false,
			"prevText": false,
			"closeText": false,
			"weekHeader": false,

			// These ones are arrays.
			// Integers are length.  If lang() has no short translation, just trim full
			"dayNames":	false,
			"dayNamesShort":3,
			"dayNamesMin":	2,
			"monthNames":	false,
			"monthNamesShort":	3
		};
		var regional = {};
		var full = [];
		for(var i in translate_fields)
		{
			var trans = _wnd.jQuery.datepicker._defaults[i];
			if(typeof trans === 'string')
			{
				trans = egw().lang(trans);
			}
			else
			{
				for(var key in trans) {
					if(translate_fields[i] === false)
					{
						trans[key] = egw().lang(trans[key]);
					}
					else
					{
						if (trans.hasOwnProperty(key)) trans[key] = full[key].substr(0,translate_fields[i]);
					}
				}
				// Keep the full one for missing short ones
				if(translate_fields[i] === false) full = trans;
			}
			regional[i] = trans;
		}

		// Set some non-lang defaults too
/*
		var prefs = calendarPreferences(egw());
		for(var i in prefs)
		{
			regional[i] = prefs[i];
		}
*/

		_wnd.jQuery.datepicker.setDefaults(regional);
	};

	function translateTimepicker()
	{
		var translate_fields = {
			// These ones are simple strings
			"timeOnlyTitle": false,
			"timeText": false,
			"hourText": false,
			"minuteText": false,
			"currentText": false,
			"closeText": false
		};
		var regional = {};
		for(var i in translate_fields)
		{
			var trans = _wnd.jQuery.timepicker._defaults[i];
			if(typeof trans === 'string')
			{
				trans = egw().lang(trans);
			}
			regional[i] = trans;
		}
		_wnd.jQuery.timepicker.setDefaults(regional);
	};

	return {
		/**
		 * setup a calendar / date-selection
		 *
		 * @member of egw
		 * @param _input
		 * @param _time
		 * @param _callback
		 * @param _context
		 * @returns
		 */
		calendar: function(_input, _time, _callback, _context)
		{
			setupCalendar(this, _input, _time, _callback, _context);
		},
		/**
		 * setup a time-selection
		 *
		 * @param _input
		 * @param _callback
		 * @param _context
		 * @returns
		 */
		time: function(_input, _callback, _context)
		{
			setupTime(this, _input);
		},
		/**
		 * transform PHP date/time-format to jQuery date/time-format
		 *
		 * @param {string} _php_format
		 * @returns {string}
		 */
		dateTimeFormat: function(_php_format)
		{
			return dateTimeFormat(_php_format);
		},

		/**
		 * Calculate the start of the week, according to user's preference
		 *
		 * @param {string} date
		 */
		week_start: function(date) {
			var d = new Date(date);
			var day = d.getUTCDay();
			var diff = 0;
			switch(egw.preference('weekdaystarts','calendar'))
			{
				case 'Saturday':
					diff = day === 6 ? 0 : day === 0 ? -1 : -(day + 1);
					break;
				case 'Monday':
					diff = day === 0 ? -6 : 1-day;
					break;
				case 'Sunday':
				default:
					diff = -day;
			}
			d.setUTCDate(d.getUTCDate() + diff);
			return d;
		}
	};
});