/**
* Sami's countdown v.1.0
* Decreases the html content of elements that contain the hours, minutes and seconds
* NOTE: requires jQuery
* @param object element - The object that contains the hours, minutes and seconds containers
* @author Samuil Banti - http://samiwell.eu
* @copyright (C) 2015 - Samuil Banti
* @license GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
* @return NULL if timer is running FALSE if its done
*/
(function( $ ){
    
    $.fn.samis_countdown = function( options ) {
        // Create some defaults, extending them with any options that were provided
        var settings = $.extend( {
            hours_holder: 'js_h', // The class of the hours container
            minutes_holder: 'js_m', // The class of the minutes container
            seconds_holder: 'js_s', // The class of the seconds container
            callback_function : false, // The callback function resives one parameter - the timer container element as object
        }, options);

        return this.each(function() {
            $.fn.samis_countdown.settings = settings;
            var element = $(this);
            countdown($(this));
        });

        function countdown(element) {
            var hours_box = element.find('.'+settings.hours_holder);
            var mins_box = element.find('.'+settings.minutes_holder);
            var secs_box = element.find('.'+settings.seconds_holder);

            var hours = parseInt(hours_box.html());
            var mins = parseInt(mins_box.html());
            var secs = parseInt(secs_box.html());

            if(hours==0 && mins==0 && secs==0) {
                if(settings.callback_function.length) {
                    settings.callback_function(element);
                }
                return false;
            }

            secs -= 1;
            if(secs < 0) {
                if(mins > 0 || hours > 0) {
                    secs = 59;
                    mins -= 1;
                    if(mins < 0) {
                        if(hours > 0) {
                            hours -= 1;
                        }
                        if(hours >= 0) {
                            mins = 59;
                        } else {
                            mins = 0;
                        }
                    }
                } else {
                    secs = 0;
                }
            }    
            hours_box.html(pad(hours, 2));
            mins_box.html(pad(mins, 2));
            secs_box.html(pad(secs, 2));
            setTimeout(function(){countdown(element)},1000);
        }

        function pad(num, size) {
            var s = num+"";
            while (s.length < size) s = "0" + s;
            return s;
        }
    };
    
})( jQuery );