/*

 *  This file contains Calendar utilities

 *  :organization: Logilab

 *  :copyright: 2003-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

 *  :contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

 */

CubicWeb.require('python.js');

CubicWeb.require('ajax.js');

// IMPORTANT NOTE: the variables DAYNAMES AND MONTHNAMES will be added

//                 by cubicweb automatically

// dynamically computed (and cached)

var _CAL_HEADER = null;

TODAY = new Date();

/*

 * Calendar (graphical) widget

 * public methods are :

 *   __init__ :

 *    @param containerId: the DOM node's ID where the calendar will be displayed

 *    @param inputId: which input needs to be updated when a date is selected

 *    @param year, @param month: year and month to be displayed

 *    @param cssclass: CSS class of the calendar widget (default is commandCal)

 *

 *   show() / hide():

 *    show or hide the calendar widget

 *

 *   toggle():

 *    show (resp. hide) the calendar if it's hidden (resp. displayed)

 * 

 *   displayNextMonth(): (resp. displayPreviousMonth())

 *    update the calendar to display next (resp. previous) month

 */

Calendar = function(containerId, inputId, year, month, cssclass) {

    this.containerId = containerId;

    this.inputId = inputId;

    this.year = year;

    this.month = month-1; // Javascript's counter starts at 0 for january

    this.cssclass = cssclass || "popupCalendar";

    this.visible = false;

    this.domtable = null;

    this.cellprops = { 'onclick'     : function() {dateSelected(this, containerId); },

		       'onmouseover' : function() {this.style.fontWeight = 'bold'; },

		       'onmouseout'  : function() {this.style.fontWeight = 'normal';}

		     }

    this.todayprops = jQuery.extend({}, this.cellprops, {'class' : 'today'});

    this._rowdisplay = function(row) {

	return TR(null, map(partial(TD, this.cellprops), row));

    }

    this._makecell = function(cellinfo) {

	return TD(cellinfo[0], cellinfo[1]);

    }

    /* utility function (the only use for now is inside the calendar) */

    this._uppercaseFirst = function(s) { return s.charAt(0).toUpperCase(); }

    /* accepts the cells data and builds the corresponding TR nodes

     * @param rows a list of list of couples (daynum, cssprops)

     */

    this._domForRows = function(rows) {

	var lines = []

	for (i=0; i<rows.length; i++) {

	    lines.push(TR(null, map(this._makecell, rows[i])));

	}

	return lines;

    }

    /* builds the calendar headers */

    this._headdisplay = function(row) {

	if (_CAL_HEADER) {

	    return _CAL_HEADER;

	}

	daynames = map(this._uppercaseFirst, DAYNAMES);

	_CAL_HEADER = TR(null, map(partial(TH, null), daynames));

	return _CAL_HEADER;

    }

    this._getrows = function() {

	var rows = [];

	var firstday = new Date(this.year, this.month, 1);

	var stopdate = firstday.nextMonth();

	var curdate = firstday.sub(firstday.getRealDay());

	while (curdate.getTime() < stopdate) {

	    var row = []

	    for (var i=0; i<7; i++) {

		if (curdate.getMonth() == this.month) {

		    props = curdate.equals(TODAY) ? this.todayprops:this.cellprops;

		    row.push([props, curdate.getDate()]);

		} else {

		    row.push([this.cellprops, ""]);

		}

		curdate.iadd(1);

	    }

	    rows.push(row);

	}

	return rows;

    }

    this._makecal = function() {

	var rows = this._getrows();

	var monthname = MONTHNAMES[this.month] + " " + this.year;

	var prevlink = "javascript: togglePreviousMonth('" + this.containerId + "');";

	var nextlink = "javascript: toggleNextMonth('" + this.containerId + "');";

	this.domtable = TABLE({'class': this.cssclass},

			      THEAD(null, TR(null,

					     TH(null, A({'href' : prevlink}, "<<")),

					     TH({'colspan' : 5, 'style' : "text-align: center;"}, monthname),

					     TH(null, A({'href' : nextlink}, ">>")))),

			      TBODY(null,

				    this._headdisplay(),

				    this._domForRows(rows))

			     );

	return this.domtable;

    }

    this._updateDiv = function() {

	if (!this.domtable) {

	    this._makecal();

	}

	jqNode(this.containerId).empty().append(this.domtable);

	// replaceChildNodes($(this.containerId), this.domtable);

    }

    this.displayNextMonth = function() {

	this.domtable = null;

	if (this.month == 11) {

	    this.year++;

	}

	this.month = (this.month+1) % 12;

	this._updateDiv();

    }

    this.displayPreviousMonth = function() {

	this.domtable = null;

	if (this.month == 0) {

	    this.year--;

	}

	this.month = (this.month+11) % 12;

	this._updateDiv();

    }

    this.show = function() {

	if (!this.visible) {

	    container = jqNode(this.containerId);

	    if (!this.domtable) {

		this._makecal();

	    }

	    container.empty().append(this.domtable);

	    toggleVisibility(container);

	    this.visible = true;

	}

    }

    this.hide = function(event) {

	var self;

	if (event) {

	    self = event.data.self;

	} else {

	    self = this;

	}

	if (self.visible) {

	    toggleVisibility(self.containerId);

	    self.visible = false;

	}

    }

    this.toggle = function() {

	if (this.visible) {

	    this.hide();

	}

	else {

	    this.show();

	}

    }

    // call hide() when the user explicitly sets the focus on the matching input

    jqNode(inputId).bind('focus', {'self': this}, this.hide); // connect(inputId, 'onfocus', this, 'hide');

};

// keep track of each calendar created

Calendar.REGISTRY = {};

/*

 * popup / hide calendar associated to `containerId`

 */	    

function toggleCalendar(containerId, inputId, year, month) {

    var cal = Calendar.REGISTRY[containerId];

    if (!cal) {

	cal = new Calendar(containerId, inputId, year, month);

	Calendar.REGISTRY[containerId] = cal;

    }

    /* hide other calendars */

    for (containerId in Calendar.REGISTRY) {

	var othercal = Calendar.REGISTRY[containerId];

	if (othercal !== cal) {

	    othercal.hide();

	}

    }

    cal.toggle();

}

/*

 * ask for next month to calendar displayed in `containerId`

 */

function toggleNextMonth(containerId) {

    var cal = Calendar.REGISTRY[containerId];

    cal.displayNextMonth();

}

/*

 * ask for previous month to calendar displayed in `containerId`

 */

function togglePreviousMonth(containerId) {

    var cal = Calendar.REGISTRY[containerId];

    cal.displayPreviousMonth();

}

/*

 * Callback called when the user clicked on a cell in the popup calendar

 */

function dateSelected(cell, containerId) {

    var cal = Calendar.REGISTRY[containerId];

    var input = getNode(cal.inputId);

    // XXX: the use of innerHTML might cause problems, but it seems to be

    //      the only way understood by both IE and Mozilla. Otherwise,

    //      IE accepts innerText and mozilla accepts textContent

    var selectedDate = new Date(cal.year, cal.month, cell.innerHTML, 12);

    var xxx = remoteExec("format_date", toISOTimestamp(selectedDate));

    input.value = xxx;

    cal.hide();

}

function whichElement(e)

{

var targ;

if (!e)

  {

  var e=window.event;

  }

if (e.target)

  {

  targ=e.target;

  }

else if (e.srcElement)

  {

  targ=e.srcElement;

  }

if (targ.nodeType==3) // defeat Safari bug

  {

  targ = targ.parentNode;

  }

  return targ;

}

function getPosition(element) {

  var left;

  var top;

  var offset;

  // TODO: deal scrollbar positions also!

  left = element.offsetLeft;

  top = element.offsetTop;

  if (element.offsetParent != null)

    {

      offset = getPosition(element.offsetParent);

      left = left + offset[0];

      top = top + offset[1];

    }

  return [left, top];

}

function getMouseInBlock(event) {

  var elt = event.target;

  var x = event.clientX;

  var y = event.clientY;

  var w = elt.clientWidth;

  var h = elt.clientHeight;

  var offset = getPosition(elt);

  x = 1.0*(x-offset[0])/w;

  y = 1.0*(y-offset[1])/h;

  return [x, y];

}

function getHourFromMouse(event, hmin, hmax) {

  var pos = getMouseInBlock(event);

  var y = pos[1];

  return Math.floor((hmax-hmin)*y + hmin);

}

function addCalendarItem(event, hmin, hmax, year, month, day, duration, baseurl) {

  var hour = getHourFromMouse(event, hmin, hmax);

  if (0<=hour && hour < 24) {

    baseurl += "&start="+year+"%2F"+month+"%2F"+day+"%20"+hour+":00";

    baseurl += "&stop="+year+"%2F"+month+"%2F"+day+"%20"+(hour+duration)+":00";

    stopPropagation(event);

    window.location.assign(baseurl);

    return false;

  }

  return true;

}

function stopPropagation(event) {

  event.cancelBubble = true;

  if (event.stopPropagation) event.stopPropagation();  

}

CubicWeb.provide('calendar.js');