// Title: Tigra Calendar
// URL: http://www.softcomplex.com/products/tigra_calendar/
// Version: 3.4 (mySQL format)
// Date: 07/12/2007
// 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;
// is time input control required by default
var BUL_TIMECOMPONENT = false;
// are year scrolling buttons required by default
var BUL_YEARSCROLL = false;

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

function calendar3(obj_target) {

    // assigning methods
    this.gen_date = cal_gen_date3;
    this.gen_time = cal_gen_time3;
    this.gen_tsmp = cal_gen_tsmp3;
    this.prs_date = cal_prs_date3;
    this.prs_time = cal_prs_time3;
    this.prs_tsmp = cal_prs_tsmp3;
    this.popup    = cal_popup3;

    // 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.time_comp = BUL_TIMECOMPONENT;
    this.year_scroll = BUL_YEARSCROLL;
    
    // register in global collections
    this.id = calendars.length;
    calendars[this.id] = this;
}

function cal_popup3 (str_datetime) {
    if (str_datetime)
        this.dt_current = this.prs_tsmp(str_datetime);
    else 
        this.dt_selected = this.dt_current = this.prs_tsmp(this.target.value);

    if (!this.dt_current) return;

    var obj_calwindow = window.open(
        '/calendar.html?id=' + this.id + '&s=' + this.dt_selected.valueOf() + '&c=' + this.dt_current.valueOf(),
        'Calendar', 'width=200,height=' + (this.time_comp ? 215 : 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_tsmp3 (dt_datetime) {
    return(this.gen_date(dt_datetime) + ' ' + this.gen_time(dt_datetime));
}

// date generating function
function cal_gen_date3 (dt_datetime) {
    return (
        dt_datetime.getFullYear() + "-"
        + (dt_datetime.getMonth() < 9 ? '0' : '') + (dt_datetime.getMonth() + 1) + "-"
        + (dt_datetime.getDate() < 10 ? '0' : '') + dt_datetime.getDate()
    );
}
// time generating function
function cal_gen_time3 (dt_datetime) {
    return (
        (dt_datetime.getHours() < 10 ? '0' : '') + dt_datetime.getHours() + ":"
        + (dt_datetime.getMinutes() < 10 ? '0' : '') + (dt_datetime.getMinutes()) + ":"
        + (dt_datetime.getSeconds() < 10 ? '0' : '') + (dt_datetime.getSeconds())
    );
}

// timestamp parsing function
function cal_prs_tsmp3 (str_datetime) {
    // if no parameter specified return current timestamp
    if (!str_datetime)
        return (new Date());

    // if positive integer treat as milliseconds from epoch
    if (RE_NUM.exec(str_datetime))
        return new Date(str_datetime);
        
    // else treat as date in string format
    var arr_datetime = str_datetime.split(' ');
    return this.prs_time(arr_datetime[1], this.prs_date(arr_datetime[0]));
}

// date parsing function
function cal_prs_date3 (str_date) {

    var arr_date = str_date.split('-');

    if (arr_date.length != 3) return alert ("Invalid date format: '" + str_date + "'.\nFormat accepted is yyyy-mm-dd.");

    if (!arr_date[0]) return alert ("Invalid date format: '" + str_date + "'.\nNo year value can be found.");
    if (!RE_NUM.exec(arr_date[0])) return alert ("Invalid year value: '" + arr_date[0] + "'.\nAllowed values are unsigned integers.");

    if (!arr_date[1]) return alert ("Invalid date format: '" + str_date + "'.\nNo month value can be found.");
    if (!RE_NUM.exec(arr_date[1])) return alert ("Invalid month value: '" + arr_date[1] + "'.\nAllowed values are unsigned integers.");

    if (!arr_date[2]) return alert ("Invalid date format: '" + str_date + "'.\nNo day of month value can be found.");
    if (!RE_NUM.exec(arr_date[2])) return alert ("Invalid day of month value: '" + arr_date[2] + "'.\nAllowed values are unsigned integers.");



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

    if (arr_date[0] < 100) arr_date[0] = Number(arr_date[0]) + (arr_date[0] < NUM_CENTYEAR ? 2000 : 1900);
    dt_date.setFullYear(arr_date[0]);


    if (arr_date[1] < 1 || arr_date[1] > 12) return alert ("Invalid month value: '" + arr_date[1] + "'.\nAllowed range is 01-12.");
    dt_date.setMonth(arr_date[1] - 1);
     

    var dt_numdays = new Date(arr_date[0], arr_date[1], 0);
    dt_date.setDate(arr_date[2]);
    if (dt_date.getMonth() != (arr_date[1]-1)) return alert ("Invalid day of month value: '" + arr_date[2] + "'.\nAllowed range is 01-"+dt_numdays.getDate()+".");

    return (dt_date)
}

// time parsing function
function cal_prs_time3 (str_time, dt_date) {

    if (!dt_date) return null;
    var arr_time = String(str_time ? str_time : '').split(':');

    if (!arr_time[0]) dt_date.setHours(0);
    else if (RE_NUM.exec(arr_time[0])) 
        if (arr_time[0] < 24) dt_date.setHours(arr_time[0]);
        else return cal_error ("Invalid hours value: '" + arr_time[0] + "'.\nAllowed range is 00-23.");
    else return cal_error ("Invalid hours value: '" + arr_time[0] + "'.\nAllowed values are unsigned integers.");
    
    if (!arr_time[1]) dt_date.setMinutes(0);
    else if (RE_NUM.exec(arr_time[1]))
        if (arr_time[1] < 60) dt_date.setMinutes(arr_time[1]);
        else return cal_error ("Invalid minutes value: '" + arr_time[1] + "'.\nAllowed range is 00-59.");
    else return cal_error ("Invalid minutes value: '" + arr_time[1] + "'.\nAllowed values are unsigned integers.");

    if (!arr_time[2]) dt_date.setSeconds(0);
    else if (RE_NUM.exec(arr_time[2]))
        if (arr_time[2] < 60) dt_date.setSeconds(arr_time[2]);
        else return cal_error ("Invalid seconds value: '" + arr_time[2] + "'.\nAllowed range is 00-59.");
    else return cal_error ("Invalid seconds value: '" + arr_time[2] + "'.\nAllowed values are unsigned integers.");

    dt_date.setMilliseconds(0);
    return dt_date;
}

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