/*
* DatePicker
* @author Rick Hopkins
* @modified by Micah Nolte and Martin Vašina
* @version 0.3.2
* @classDescription A date picker object. Created with the help of MooTools v1.11
* MIT-style License.

-- start it up by doing this in your domready:

$$('input.DatePicker').each( function(el){
  new DatePicker(el);
});

SoftIdiom - RCW
v1.2 29/02/2008
* added a clear button to the calendar.
v1.1 28/02/2008
* changed calendar node position to injectTop in parent node.
v1.0 16/02/2008
* fixed bug getting date from existing value.
*/

var DatePicker = new Class({

  /* set and create the date picker text box */
  initialize: function(dp){

    // Options defaults
    this.dayChars = 1; // number of characters in day names abbreviation
    this.dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
    this.daysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    this.format = 'dd/mm/yyyy';
    this.monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
    this.startDay = 7; // 1 = week starts on Monday, 7 = week starts on Sunday
    this.yearOrder = 'asc';
    this.yearRange = 3;
    this.yearStart = (new Date().getFullYear());


    // Pull the options from the alt attr
    if(dp.alt) {
      options = Json.evaluate(dp.alt);
    } else {
      options = [];
    }
    dp.options = {
      monthNames: (options.monthNames && options.monthNames.length == 12 ? options.monthNames : this.monthNames) || this.monthNames, 
      daysInMonth: (options.daysInMonth && options.daysInMonth.length == 12 ? options.daysInMonth : this.daysInMonth) || this.daysInMonth, 
      dayNames: (options.dayNames && options.dayNames.length == 7 ? options.dayNames : this.dayNames) || this.dayNames,
      startDay : options.startDay || this.startDay,
      dayChars : options.dayChars || this.dayChars, 
      format: options.format || this.format,
      yearStart: options.yearStart || this.yearStart,
      yearRange: options.yearRange || this.yearRange,
      yearOrder: options.yearOrder || this.yearOrder
    };
    
    // Finds the entered date, or uses the current date
    if(dp.value != '') {
      dp.then = this.getDate(dp);
      dp.today = new Date();
    } else {
      dp.then = dp.today = new Date();
    }
    // Set beginning time and today, remember the original
    dp.oldYear = dp.year = dp.then.getFullYear();
    dp.oldMonth = dp.month = dp.then.getMonth();
    dp.oldDay = dp.then.getDate();
    dp.nowYear = dp.today.getFullYear();
    dp.nowMonth = dp.today.getMonth();
    dp.nowDay = dp.today.getDate();

    // setup other properties.
    dp.setProperties({'id':dp.getProperty('name'), 'readonly':true});
    dp.container = false;
    dp.calendar = false;
    dp.interval = null;
    dp.active = false;
    dp.onclick = dp.onfocus = this.create.pass(dp, this);
  },

  /* create the calendar */
  create: function(dp){
    if (dp.calendar) return false;

    // Hide select boxes while calendar is up
    if(window.ie6){
      $$('select').addClass('dp_hide');
    }
    
    /* create the outer container */
    dp.container = new Element('div', {'class':'dp_container'}).injectTop(dp.parentNode);
    
    /* create timers */
    dp.container.onmouseover = dp.onmouseover = function(){
      $clear(dp.interval);
    };
    dp.container.onmouseout = dp.onmouseout = function(){
      dp.interval = setInterval(function(){
        if (!dp.active) this.remove(dp);
      }.bind(this), 500);
    }.bind(this);
    
    /* create the calendar */
    dp.calendar = new Element('div', {'class':'dp_cal'}).injectInside(dp.container);
    
    /* create the date object */
    var date = new Date();
    
    /* create the date object */
    if (dp.month && dp.year) {
      date.setFullYear(dp.year, dp.month, 1);
    } else {
      dp.month = date.getMonth();
      dp.year = date.getFullYear();
      date.setDate(1);
    }
    dp.year % 4 == 0 ? dp.options.daysInMonth[1] = 29 : dp.options.daysInMonth[1] = 28;
    
    /* set the day to first of the month */
    var firstDay = (1-(7+date.getDay()-dp.options.startDay)%7);
    
    
    
    /* create the month select box */
    var monthSel = new Element('select', {'id':dp.id + '_monthSelect'});
    for (var m = 0; m < dp.options.monthNames.length; m++){
      monthSel.options[m] = new Option(dp.options.monthNames[m], m);
      if (dp.month == m) monthSel.options[m].selected = true;
    }
    
    /* create the year select box */
    var yearSel = new Element('select', {'id':dp.id + '_yearSelect'});
    i = 0;
    dp.options.yearStart ? dp.options.yearStart : dp.options.yearStart = date.getFullYear();
    if (dp.options.yearOrder == 'desc'){
      for (var y = dp.options.yearStart; y > (dp.options.yearStart - dp.options.yearRange - 1); y--){
        yearSel.options[i] = new Option(y, y);
        if (dp.year == y) yearSel.options[i].selected = true;
        i++;
      }
    } else {
      for (var y = dp.options.yearStart; y < (dp.options.yearStart + dp.options.yearRange + 1); y++){
        yearSel.options[i] = new Option(y, y);
        if (dp.year == y) yearSel.options[i].selected = true;
        i++;
      }
    }
    
    /* create the clear button. */
    var clearButton = new Element('input', {'id':dp.id + '_clear'});
    clearButton.type = "button";
    clearButton.value = "clear";
    clearButton.className = "clearbutton";
    clearButton.title = "click here to clear the date from the date field";
    
    /* start creating calendar */
    var calTable = new Element('table');
    var calTableThead = new Element('thead');
    var calSelRow = new Element('tr');
    var calSelCell = new Element('th', {'colspan':'7'});
    monthSel.injectInside(calSelCell);
    yearSel.injectInside(calSelCell);
    clearButton.injectInside(calSelCell);
    calSelCell.injectInside(calSelRow);
    calSelRow.injectInside(calTableThead);
    var calTableTbody = new Element('tbody');
    
    /* create day names */
    calDayNameRow = new Element('tr');
    for (var i = 0; i < dp.options.dayNames.length; i++) {
      calDayNameCell = new Element('th');
      calDayNameCell.appendText(dp.options.dayNames[(dp.options.startDay+i)%7].substr(0, dp.options.dayChars)); 
      calDayNameCell.injectInside(calDayNameRow);
    }
    calDayNameRow.injectInside(calTableTbody);
    
    /* create the day cells */
    while (firstDay <= dp.options.daysInMonth[dp.month]){
      calDayRow = new Element('tr');
      for (i = 0; i < 7; i++){
        if ((firstDay <= dp.options.daysInMonth[dp.month]) && (firstDay > 0)){
          calDayCell = new Element('td', {'class':dp.id + '_calDay', 'axis':dp.year + '|' + (parseInt(dp.month) + 1) + '|' + firstDay}).appendText(firstDay).injectInside(calDayRow);
        } else {
          calDayCell = new Element('td', {'class':'dp_empty'}).appendText(' ').injectInside(calDayRow);
        }
        // Show the previous day
        if ( (firstDay == dp.oldDay) && (dp.month == dp.oldMonth ) && (dp.year == dp.oldYear) ) {
          calDayCell.addClass('dp_selected');
        }
        // Show today
        if ( (firstDay == dp.nowDay) && (dp.month == dp.nowMonth ) && (dp.year == dp.nowYear) ) {
          calDayCell.addClass('dp_today');
        }
        firstDay++;
      }
      calDayRow.injectInside(calTableTbody);
    }
    
    /* table into the calendar div */
    calTableThead.injectInside(calTable);
    calTableTbody.injectInside(calTable);
    calTable.injectInside(dp.calendar);
    
    /* set the onmouseover events for all calendar days */
    $$('td.' + dp.id + '_calDay').each(function(el){
      el.onmouseover = function(){
        el.addClass('dp_roll');
      }.bind(this);
    }.bind(this));
    
    /* set the onmouseout events for all calendar days */
    $$('td.' + dp.id + '_calDay').each(function(el){
      el.onmouseout = function(){
        el.removeClass('dp_roll');
      }.bind(this);
    }.bind(this));
    
    /* set the onclick events for all calendar days */
    $$('td.' + dp.id + '_calDay').each(function(el){
      el.onclick = function(){
        ds = el.axis.split('|');
        dp.value = this.formatValue(dp, ds[0], ds[1], ds[2]);
        if (dp.onchange != null) { dp.onchange(); }
        this.remove(dp);
      }.bind(this);
    }.bind(this));
    
    /* set the onchange event for the month select box */
    monthSel.onfocus = function(){ dp.active = true; };
    monthSel.onchange = function(){
      dp.month = monthSel.value;
      dp.year = yearSel.value;
      this.remove(dp);
      this.create(dp);
    }.bind(this);
    
    /* set the onchange event for the year select box */
    yearSel.onfocus = function(){ dp.active = true; };
    yearSel.onchange = function(){
      dp.month = monthSel.value;
      dp.year = yearSel.value;
      this.remove(dp);
      this.create(dp);
    }.bind(this);

    /* set the onclick event for the clear button */
    clearButton.onclick = function(){
      dp.value = "";
      if (dp.onchange != null) { dp.onchange(); }
      this.remove(dp);
    }.bind(this);
  },
  
  /* return a date derived from the input value. */
  getDate: function(dp) {
    var info = dp.options.format.match(/d+/);
    if (info == null || info.length == 0) { return new Date(); }
    var index = dp.options.format.search(/d+/);
    var day = dp.value.substr(index, info[0].length) * 1;
    
    var info = dp.options.format.match(/m+/);
    if (info == null || info.length == 0) { return new Date(); }
    var index = dp.options.format.search(/m+/);
    var month = dp.value.substr(index, info[0].length) * 1;
    
    var info = dp.options.format.match(/y+/);
    if (info == null || info.length == 0) { return new Date(); }
    var index = dp.options.format.search(/y+/);
    var year = dp.value.substr(index, info[0].length) * 1;
    
    return new Date(year,month-1,day,12,0,0,0);
  },
    
  /* Format the returning date value according to the selected formation */
  formatValue: function(dp, year, month, day){
    /* setup the date string variable */
    var dateStr = '';
    
    /* check the length of day */
    if (day < 10) day = '0' + day;
    if (month < 10) month = '0' + month;
    
    /* check the format & replace parts // thanks O'Rey */
    dateStr = dp.options.format.replace( /dd/i, day ).replace( /mm/i, month ).replace( /yyyy/i, year );
    dp.month = dp.oldMonth = '' + (month - 1) + '';
    dp.year = dp.oldYear = year;
    dp.oldDay = day;
    
    /* return the date string value */
    return dateStr;
  },
  
  /* Remove the calendar from the page */
  remove: function(dp){
    $clear(dp.interval);
    dp.active = false;
    if (window.opera) dp.container.empty();
    else if (dp.container) dp.container.remove();
    dp.calendar = false;
    dp.container = false;
    $$('select.dp_hide').removeClass('dp_hide');
  }
});