/*
 * DatePicker
 * @author Rick Hopkins
 * @modified by Micah Nolte and Martin VaЕЎina
 * @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);
});

 */

var DatePicker = new Class({

    Implements: [Options],

    options: {
      monthNames: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
      daysInMonth: [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
      dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
      startDay : 7,
      dayChars : 1,
      format: 'mm/dd/yyyy',
      yearStart: (new Date().getFullYear()),
      yearRange: 10,
      yearOrder: 'asc'
    },

  /* set and create the date picker text box */
  initialize: function(dp,options){
    // Finds the entered date, or uses the current date
    if(dp.value != '') {
      dp.then = new Date(dp.value);
      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();

    this.setOptions(options)

    dp.setProperties({'id':dp.getProperty('id'), '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'}).injectBefore(dp);

    /* 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 ? this.options.daysInMonth[1] = 29 : this.options.daysInMonth[1] = 28;

    /* set the day to first of the month */
    var firstDay = (1-(7+date.getDay()-this.options.startDay)%7);



    /* create the month select box */
    monthSel = new Element('select', {'id':dp.id + '_monthSelect'});
    for (var m = 0; m < this.options.monthNames.length; m++){
      monthSel.options[m] = new Option(this.options.monthNames[m], m);
      if (dp.month == m) monthSel.options[m].selected = true;
    }

    /* create the year select box */
    yearSel = new Element('select', {'id':dp.id + '_yearSelect'});
    i = 0;
    this.options.yearStart ? this.options.yearStart : this.options.yearStart = date.getFullYear();
    if (this.options.yearOrder == 'desc'){
      for (var y = this.options.yearStart; y > (this.options.yearStart - this.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 = this.options.yearStart; y < (this.options.yearStart + this.options.yearRange + 1); y++){
        yearSel.options[i] = new Option(y, y);
        if (dp.year == y) yearSel.options[i].selected = true;
        i++;
      }
    }

    /* start creating calendar */
    calTable = new Element('table');
    calTableThead = new Element('thead');
    calSelRow = new Element('tr');
    calSelCell = new Element('th', {'colspan':'7'});
    monthSel.injectInside(calSelCell);
    yearSel.injectInside(calSelCell);
    calSelCell.injectInside(calSelRow);
    calSelRow.injectInside(calTableThead);
    calTableTbody = new Element('tbody');

    /* create day names */
    calDayNameRow = new Element('tr');
    for (var i = 0; i < this.options.dayNames.length; i++) {
      calDayNameCell = new Element('th');
      calDayNameCell.appendText(this.options.dayNames[(this.options.startDay+i)%7].substr(0, this.options.dayChars));
      calDayNameCell.injectInside(calDayNameRow);
    }
    calDayNameRow.injectInside(calTableTbody);

    /* create the day cells */
    while (firstDay <= this.options.daysInMonth[dp.month]){
      calDayRow = new Element('tr');
      for (i = 0; i < 7; i++){
        if ((firstDay <= this.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]);
        this.remove(dp);
      }.bind(this);
    }.bind(this));

    /* set the onchange event for the month & year select boxes */
    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);

    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);
  },

  /* 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 = this.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.dispose();
    dp.calendar = false;
    dp.container = false;
    $$('select.dp_hide').removeClass('dp_hide');
  }
});