// Tigra Calendar v5.0 (09/09/2011)
// http://www.softcomplex.com/products/tigra_calendar/
// License: Public Domain... You're welcome.

// default settins - this structure can be moved in separate file in multilangual applications
var A_TCALCONF = {
  'cssprefix'  : 'tcal',
  'months'     : ['Leden', 'Únor', 'Březen', 'Duben', 'Květen', 'Červen', 'Červenec', 'Srpen', 'Září', 'Říjen', 'Listopad', 'Prosinec'],
  'weekdays'   : ['Ne', 'Po', 'Út', 'St', 'Čt', 'Pá', 'So'],
  'longwdays'  : ['Neděle', 'Pondělí', 'Úterý', 'Středa', 'Čtvrtek', 'Pátek', 'Sobota'],
  'yearscroll' : true, // show year scroller
  'weekstart'  : 1, // first day of week: 0-Su or 1-Mo
  'prevyear'   : 'Předchozí rok',
  'nextyear'   : 'Další rok',
  'prevmonth'  : 'Předchozí měsíc',
  'nextmonth'  : 'Další měsíc',
  'format'     : 'd.m.Y' // 'd-m-Y', d.m.Y', 'l, F jS Y'
};

var A_TCALTOKENS = [
   // A full numeric representation of a year, 4 digits
  {'t': 'Y', 'r': '19\\d{2}|20\\d{2}', 'p': function (d_date, n_value) { d_date.setFullYear(Number(n_value)); return d_date; }, 'g': function (d_date) { var n_year = d_date.getFullYear(); return n_year; }},
   // Numeric representation of a month, with leading zeros
  {'t': 'm', 'r': '0?[1-9]|1[0-2]', 'p': function (d_date, n_value) { d_date.setMonth(Number(n_value) - 1); return d_date; }, 'g': function (d_date) { var n_month = d_date.getMonth() + 1; return (n_month < 10 ? '0' : '') + n_month }},
   // A full textual representation of a month, such as January or March
  {'t': 'F', 'r': A_TCALCONF.months.join('|'), 'p': function (d_date, s_value) { for (var m = 0; m < 12; m++) if (A_TCALCONF.months[m] == s_value) { d_date.setMonth(m); return d_date; }}, 'g': function (d_date) { return A_TCALCONF.months[d_date.getMonth()]; }},
   // Day of the month, 2 digits with leading zeros
  {'t': 'd', 'r': '0?[1-9]|[12][0-9]|3[01]', 'p': function (d_date, n_value) { d_date.setDate(Number(n_value)); if (d_date.getDate() != n_value) d_date.setDate(0); return d_date }, 'g': function (d_date) { var n_date = d_date.getDate(); return (n_date < 10 ? '0' : '') + n_date; }},
  // Day of the month without leading zeros
  {'t': 'j', 'r': '0?[1-9]|[12][0-9]|3[01]', 'p': function (d_date, n_value) { d_date.setDate(Number(n_value)); if (d_date.getDate() != n_value) d_date.setDate(0); return d_date }, 'g': function (d_date) { var n_date = d_date.getDate(); return n_date; }},
   // A full textual representation of the day of the week
  {'t': 'l', 'r': A_TCALCONF.longwdays.join('|'), 'p': function (d_date, s_value) { return d_date }, 'g': function (d_date) { return A_TCALCONF.longwdays[d_date.getDay()]; }},
  // English ordinal suffix for the day of the month, 2 characters
  {'t': 'S', 'r': 'st|nd|rd|th', 'p': function (d_date, s_value) { return d_date }, 'g': function (d_date) { n_date = d_date.getDate(); if (n_date % 10 == 1 && n_date != 11) return 'st'; if (n_date % 10 == 2 && n_date != 12) return 'nd'; if (n_date % 10 == 3 && n_date != 13) return 'rd'; return 'th'; }}

];

function f_tcalGetHTML (d_date) {

  var e_input = f_tcalGetInputs(true);
  if (!e_input) return;

  var s_pfx = A_TCALCONF.cssprefix,
    s_format = A_TCALCONF.format;

  // today from config or client date
  var d_today = f_tcalParseDate(A_TCALCONF.today, A_TCALCONF.format);
  if (!d_today)
    d_today = f_tcalResetTime(new Date());

  // selected date from input or config or today
  var d_selected = f_tcalParseDate(e_input.value, s_format);
  if (!d_selected)
    d_selected = f_tcalParseDate(A_TCALCONF.selected, A_TCALCONF.format);
  if (!d_selected)
    d_selected = new Date(d_today);

  // show calendar for passed or selected date
  d_date = d_date ? f_tcalResetTime(d_date) : new Date(d_selected);

  var d_firstDay = new Date(d_date);
    d_firstDay.setDate(1);
   d_firstDay.setDate(1 - (7 + d_firstDay.getDay() - A_TCALCONF.weekstart) % 7);

    var a_class, s_html = '<table id="' + s_pfx + 'Controls"><tbody><tr>'
        + (A_TCALCONF.yearscroll ? '<td id="' + s_pfx + 'PrevYear" ' + f_tcalRelDate(d_date, -1, 'y') + ' title="' + A_TCALCONF.prevyear + '">&nbsp;</td>' : '')
        + '<td id="' + s_pfx + 'PrevMonth"' + f_tcalRelDate(d_date, -1) + ' title="' + A_TCALCONF.prevmonth + '">&nbsp;</td><th>'
        + A_TCALCONF.months[d_date.getMonth()] + ' ' + d_date.getFullYear()
            + '</th><td id="' + s_pfx + 'NextMonth"' + f_tcalRelDate(d_date, 1) + ' title="' + A_TCALCONF.nextmonth + '">&nbsp;</td>'
        + (A_TCALCONF.yearscroll ? '<td id="' + s_pfx + 'NextYear"' + f_tcalRelDate(d_date, 1, 'y') + ' title="' + A_TCALCONF.nextyear + '">&nbsp;</td></td>' : '')
        + '</tr></tbody></table><table id="' + s_pfx + 'Grid"><tbody><tr>';

    // print weekdays titles
    for (var i = 0; i < 7; i++)
        s_html += '<th>' + A_TCALCONF.weekdays[(A_TCALCONF.weekstart + i) % 7] + '</th>';
    s_html += '</tr>' ;

    // print calendar table
    var n_date, n_month, d_current = new Date(d_firstDay);
    while (d_current.getMonth() == d_date.getMonth() ||
        d_current.getMonth() == d_firstDay.getMonth()) {

        s_html +='<tr>';
        for (var n_wday = 0; n_wday < 7; n_wday++) {

            a_class = [];
            n_date  = d_current.getDate();
            n_month = d_current.getMonth();

            if (d_current.getMonth() != d_date.getMonth())
                a_class[a_class.length] = s_pfx + 'OtherMonth';
            if (d_current.getDay() == 0 || d_current.getDay() == 6)
                a_class[a_class.length] = s_pfx + 'Weekend';
            if (d_current.valueOf() == d_today.valueOf())
                a_class[a_class.length] = s_pfx + 'Today';
            if (d_current.valueOf() == d_selected.valueOf())
                a_class[a_class.length] =  s_pfx + 'Selected';

            s_html += '<td' + f_tcalRelDate(d_current) + (a_class.length ? ' class="' + a_class.join(' ') + '">' : '>') + n_date + '</td>';
            d_current.setDate(++n_date);
        }
        s_html +='</tr>';
    }
    s_html +='</tbody></table>';

    return s_html;
}

function f_tcalRelDate (d_date, d_diff, s_units) {

  var s_units = (s_units == 'y' ? 'FullYear' : 'Month');
  var d_result = new Date(d_date);
  if (d_diff) {
    d_result['set' + s_units](d_date['get' + s_units]() + d_diff);
    if (d_result.getDate() != d_date.getDate())
      d_result.setDate(0);
  }
    return ' onclick="f_tcalUpdate(' + d_result.valueOf() + (d_diff ? ',1' : '') + ')" onselectstart="return false"';
}

function f_tcalResetTime (d_date) {
    d_date.setMilliseconds(0);
    d_date.setSeconds(0);
    d_date.setMinutes(0);
    d_date.setHours(12);
    return d_date;
}

// closes calendar and returns all inputs to default state
function f_tcalCancel () {

  var s_pfx = A_TCALCONF.cssprefix;
  var e_cal = document.getElementById(s_pfx);
  if (e_cal)
    e_cal.style.visibility = '';
  var a_inputs = f_tcalGetInputs();
  for (var n = 0; n < a_inputs.length; n++)
    f_tcalRemoveClass(a_inputs[n], s_pfx + 'Active');
}

function f_tcalUpdate (n_date, b_keepOpen) {

  var e_input = f_tcalGetInputs(true);
  if (!e_input) return;

  d_date = new Date(n_date);
  var s_pfx = A_TCALCONF.cssprefix;

  if (b_keepOpen) {
    var e_cal = document.getElementById(s_pfx);
    if (!e_cal || e_cal.style.visibility != 'visible') return;
    e_cal.innerHTML = f_tcalGetHTML(d_date, e_input);
  }
  else {
    e_input.value = f_tcalGenerateDate(d_date, A_TCALCONF.format);
    f_tcalCancel();
  }
}

function f_tcalOnClick () {

  // see if already opened
  var s_pfx = A_TCALCONF.cssprefix;
  var s_activeClass = s_pfx + 'Active';
  var b_close = f_tcalHasClass(this, s_activeClass);

  // close all clalendars
  f_tcalCancel();
  if (b_close) return;

  // get position of input
  f_tcalAddClass(this, s_activeClass);

  var n_left = f_getPosition (this, 'Left'),
    n_top  = f_getPosition (this, 'Top') + this.offsetHeight;

  var e_cal = document.getElementById(s_pfx);
  if (!e_cal) {
    e_cal = document.createElement('div');
    e_cal.id = s_pfx;
    document.getElementsByTagName("body").item(0).appendChild(e_cal);
  }
  e_cal.innerHTML = f_tcalGetHTML(null);
  e_cal.style.top = n_top + 'px';
  e_cal.style.left = (n_left + this.offsetWidth - e_cal.offsetWidth) + 'px';
  e_cal.style.visibility = 'visible';
}

function f_tcalParseDate (s_date, s_format) {

  if (!s_date) return;

  var s_char, s_regexp = '^', a_tokens = {}, a_options, n_token = 0;
  for (var n = 0; n < s_format.length; n++) {
    s_char = s_format.charAt(n);
    if (A_TCALTOKENS_IDX[s_char]) {
      a_tokens[s_char] = ++n_token;
      s_regexp += '(' + A_TCALTOKENS_IDX[s_char]['r'] + ')';
    }
    else if (s_char == ' ')
      s_regexp += '\\s';
    else
      s_regexp += (s_char.match(/[\w\d]/) ? '' : '\\') + s_char;
  }
  var r_date = new RegExp(s_regexp + '$');
  if (!s_date.match(r_date)) return;

  var s_val, d_date = f_tcalResetTime(new Date());
  d_date.setDate(1);

  for (n = 0; n < A_TCALTOKENS.length; n++) {
    s_char = A_TCALTOKENS[n]['t'];
    if (!a_tokens[s_char])
      continue;
    s_val = eval('RegExp.$' + a_tokens[s_char]);
    d_date = A_TCALTOKENS[n]['p'](d_date, s_val);
  }

  return d_date;
}

function f_tcalGenerateDate (d_date, s_format) {

  var s_char, s_date = '';
  for (var n = 0; n < s_format.length; n++) {
    s_char = s_format.charAt(n);
    s_date += A_TCALTOKENS_IDX[s_char] ? A_TCALTOKENS_IDX[s_char]['g'](d_date) : s_char;
  }
  return s_date;
}

function f_tcalGetInputs (b_active) {

  var a_inputs = document.getElementsByTagName('input'),
    e_input, s_rel, a_result = [];

  for (n = 0; n < a_inputs.length; n++) {

    e_input = a_inputs[n];
    if (!e_input.type || e_input.type != 'text')
      continue;

    s_rel = e_input.getAttribute('rel');
    if (!s_rel || s_rel.indexOf('tcal') != 0)
      continue;

    if (b_active && f_tcalHasClass(e_input, A_TCALCONF.cssprefix + 'Active'))
      return e_input;

    a_result[a_result.length] = e_input;
  }
  return b_active ? null : a_result;
}

function f_tcalHasClass (e_elem, s_class) {
  var s_classes = e_elem.className;
  if (!s_classes)
    return false;
  var a_classes = s_classes.split(' ');
  for (var n = 0; n < a_classes.length; n++)
    if (a_classes[n] == s_class)
      return true;
  return false;
}

function f_tcalAddClass (e_elem, s_class) {
  if (f_tcalHasClass (e_elem, s_class))
    return;

  var s_classes = e_elem.className;
  e_elem.className = (s_classes ? s_classes + ' ' : '') + s_class;
}

function f_tcalRemoveClass (e_elem, s_class) {
  var s_classes = e_elem.className;
  if (!s_classes || s_classes.indexOf(s_class) == -1)
    return false;

  var a_classes = s_classes.split(' '),
    a_newClasses = [];

  for (var n = 0; n < a_classes.length; n++) {
    if (a_classes[n] == s_class)
      continue;
    a_newClasses[a_newClasses.length] = a_classes[n];
  }
  e_elem.className = a_newClasses.join(' ');
  return true;
}

function f_getPosition (e_elemRef, s_coord) {
  var n_pos = 0, n_offset,
    e_elem = e_elemRef;

  while (e_elem) {
    n_offset = e_elem["offset" + s_coord];
    n_pos += n_offset;
    e_elem = e_elem.offsetParent;
  }

  e_elem = e_elemRef;
  while (e_elem != document.body) {
    n_offset = e_elem["scroll" + s_coord];
    if (n_offset && e_elem.style.overflow == 'scroll')
      n_pos -= n_offset;
    e_elem = e_elem.parentNode;
  }
  return n_pos;
}

function f_tcalInit () {

  if (!document.getElementsByTagName)
    return;

  var e_input, a_inputs = f_tcalGetInputs();
  for (var n = 0; n < a_inputs.length; n++) {
    e_input = a_inputs[n];
    e_input.onclick = f_tcalOnClick;
    f_tcalAddClass(e_input, A_TCALCONF.cssprefix + 'Input');
  }

  window.A_TCALTOKENS_IDX = {};
  for (n = 0; n < A_TCALTOKENS.length; n++)
    A_TCALTOKENS_IDX[A_TCALTOKENS[n]['t']] = A_TCALTOKENS[n];
}

function f_tcalAddOnload (f_func) {
  if (document.addEventListener) {
    window.addEventListener('load', f_func, false);
  }
  else if (window.attachEvent) {
    window.attachEvent('onload', f_func);
  }
  else {
    var f_onLoad = window.onload;
    if (typeof window.onload != 'function') {
      window.onload = f_func;
    }
    else {
      window.onload = function() {
        f_onLoad();
        f_func();
      }
    }
  }
}

f_tcalAddOnload (f_tcalInit);