/*
* jCountdown
* Creates a countdown timer from a jQuery object. Allows you to format
* the way the time is displayed.
*
* $(<selector>).countdown({params});
*
* If you want to replace the 
*
*/
jQuery.fn.countdown = function(params) {
    var self = this;

    //Properties
    //----------------------------------------------            
    //set the time and day to work with
    self.display = $(this);
    self.target = new Date(params.date);
    self.message = params.message ? params.message : "";
    self.addZeros = params.addZeros ? params.addZeros : false;

    //Events
    //----------------------------------------------
    self.onTick = params.onTick ? params.onTick : function() { return true; };
    self.onFinish = params.onFinish ? params.onFinish : function() { return true; };

    //Methods
    //----------------------------------------------   
    //Updates the text for the countdown timer
    self._tick = function() {

        //get the time difference
        var now = (self.target - new Date());

        //make sure success hasn't been reached
        if (now.valueOf() < 0) {

            //clear the interval and run the event
            window.clearInterval(self._interval);
            if (!self.onFinish(self.display)) { return; }

            //display the finish message
            self.display.html(self.message);
            return;

        };

        //update the values
        var seconds = now.valueOf() / 1000;
        var day = (Math.floor(seconds / 86400)) % 86400;
        var hrs = (Math.floor(seconds / 3600)) % 24;
        var min = (Math.floor(seconds / 60)) % 60;
        var sec = (Math.floor(seconds / 1)) % 60;
        
        //check for zeros
        if (self.addZeros) {
            day = (day + "").length < 2 ? "0" + day : day;
            hrs = (hrs + "").length < 2 ? "0" + hrs : hrs;
            min = (min + "").length < 2 ? "0" + min : min;
            sec = (sec + "").length < 2 ? "0" + sec : sec;
        };

        //run the event if needed
        if (!self.onTick(self.display, day, hrs, min, sec)) { return; };


        //display the new time
        self.display.html(
            day + "<span>days</span>" +
            hrs + "<span>hrs</span>" +
            min + "<span>min</span>" +
            sec + "<span>sec</span>"
            );
    };


    //Setup Routine
    //----------------------------------------------
    self._interval = window.setInterval(
        self._tick,
        params.interval ? params.interval : 1000
        );

    //run immediately by default
    if (!params.delayStart) { self._tick(); };

    //return itself
    return this;

};