// Title: Tigra Calendar
// URL: http://www.softcomplex.com/products/tigra_calendar/
// Version: 3.2 (European date format)
// Date: 10/14/2002 (mm/dd/yyyy)
// Note: Permission given to use this script in ANY kind of applications if
//    header lines are left unchanged.
// Note: Script consists of two files: calendar?.js and calendar.html

// if two digit year input dates after this year considered 20 century.
var NUM_CENTYEAR = 30;
var MONTHYEAR = false;

var calendars = [];
var RE_NUM = /^\-?\d+$/;

function calendar(obj_target) {
	// assigning methods
	this.gen_date = cal_gen_date;
    this.gen_month = cal_gen_month;
    this.gen_year = cal_gen_year;
	this.gen_tsmp = cal_gen_tsmp;
	this.prs_date = cal_prs_date;
	this.prs_tsmp = cal_prs_tsmp;
	this.popup    = cal_popup;

	// validate input parameters
	if (!obj_target)
		return cal_error("Error calling the calendar: no target control specified");
	if (obj_target.value == null)
		return cal_error("Error calling the calendar: parameter specified is not valid target control");
	this.target = obj_target;

    this.monthyear = MONTHYEAR;

	// register in global collections
	this.id = calendars.length;
	calendars[this.id] = this;
}

function cal_popup (str_datetime) {
    // if positive integer treat as milliseconds from epoch
    if (str_datetime && RE_NUM.exec(str_datetime))
        this.dt_current = new Date(str_datetime);
    else
    	this.dt_current = this.prs_tsmp(str_datetime ? str_datetime : this.target.value);
	if (!this.dt_current) return;

	var obj_calwindow = window.open(
		'/basile/js/tigra_calendar/calendar.html?datetime=' + this.dt_current.valueOf()+ '&id=' + this.id,
		'Calendar', 'width=200,height=190,status=no,resizable=no,top=200,left=200,dependent=yes,alwaysRaised=yes'
	);
	obj_calwindow.opener = window;
	obj_calwindow.focus();
}

// timestamp generating function
function cal_gen_tsmp (dt_datetime) {
	return(this.gen_date(dt_datetime));
}

// date generating function
function cal_gen_date (dt_datetime) {
	return (
		(dt_datetime.getDate() < 10 ? '0' : '') + dt_datetime.getDate() + "/"
		+ (dt_datetime.getMonth() < 9 ? '0' : '') + (dt_datetime.getMonth() + 1) + "/"
		+ dt_datetime.getFullYear()
	);
}

// month generating function
function cal_gen_month (dt_datetime) {
	return (
		(dt_datetime.getMonth() < 9 ? '0' : '') + (dt_datetime.getMonth() + 1) + "/"
		+ dt_datetime.getFullYear()
	);
}

// year generating function
function cal_gen_year (dt_datetime) {
	return (
		dt_datetime.getFullYear()
	);
}

// timestamp parsing function
function cal_prs_tsmp (str_datetime) {
	// if no parameter specified return current timestamp
	if (!str_datetime)
		return (new Date());

	// else treat as date in string format
	var arr_datetime = str_datetime.split(' ');
	return this.prs_date(arr_datetime[0]);
}

// date parsing function
function cal_prs_date (str_date) {
	var arr_date = str_date.split('/');
    var year, month, day;

    switch (arr_date.length) {
        case 1:
            day = 1;
            month = 1;
            year = arr_date[0];
            break;
        case 2:
            day = 1;
            month = arr_date[0];
            year = arr_date[1];
            break;
        case 3:
            day = arr_date[0];
            month = arr_date[1];
            year = arr_date[2];
            break;
        default:
            return cal_error ("Format de la date invalide: '" + str_date + "'.\nLes format acceptés sont yyyy, mm/yyyy et dd/mm/yyyy.");
    }

    if (!day) return cal_error ("Format de la date invalide: '" + str_date + "'.\nLe jour du mois est invalide.");
    if (!RE_NUM.exec(day)) return cal_error ("Jour du mois invalide: '" + day + "'.\nLes valeurs permises sont des entiers.");
    if (!month) return cal_error ("Format de la date invalide: '" + str_date + "'.\nLe mois est invalide.");
    if (!RE_NUM.exec(month)) return cal_error ("Mois invalide: '" + month + "'.\nLes valeurs permises sont des entiers.");
    if (!year) return cal_error ("Format de la date invalide: '" + str_date + "'.\nL'année est invalide.");
    if (!RE_NUM.exec(year)) return cal_error ("Année invalide: '" + year + "'.\nLes valeurs permises sont des entiers.");

	var dt_date = new Date();
	dt_date.setDate(1);

	if (month < 1 || month > 12) return cal_error ("Le mois est invalide: '" + month + "'.\nLes valeurs permises sont 01-12.");
	dt_date.setMonth(month-1);

	if (year < 100) year = Number(year) + (year < NUM_CENTYEAR ? 2000 : 1900);
	dt_date.setFullYear(year);

	var dt_numdays = new Date(year, month, 0);
	dt_date.setDate(day);
	if (dt_date.getMonth() != (month-1)) return cal_error ("Le jour du mois est invalide: '" + month + "'.\nLes valeurs permises sont 01-"+dt_numdays.getDate()+".");

	return (dt_date)
}

function cal_error (str_message) {
	alert (str_message);
	return null;
}