var WINDOW_WIDTH=1024;
var WINDOW_HEIGHT=768;
var RADIUS=8;
var MARGIN_TOP=60;
var MARGIN_LEFT=30;

const endTime=new Date(2016,0,27,18,47,52);
var curShowTimeSeconds=0;

var balls=[];
const colors=["#33b5e5","#0099cc","#aa66cc","#9933cc","#99cc00","#66990","#ffbb33","#ff8800","#ff4444","#cc0000"]

window.onload=function(){
    var canvas=document.getElementById("canvas");
    var context=canvas.getContext("2d");

    canvas.width=WINDOW_WIDTH;
    canvas.height=WINDOW_HEIGHT;

    curShowTimeSeconds=getCurrentShowTimeSeconds();
    setInterval(function(){
        render(context);
        update();
    },50)
    
}

function getCurrentShowTimeSeconds(){
    var curTime=new Date();
    var ret=endTime.getTime()-curTime.getTime();
    ret=Math.round(ret/1000);
    return ret>=0?ret:0;
}
function update(){
    var nextShowTimeSeconds=getCurrentShowTimeSeconds();

    var nextHours=parseInt(nextShowTimeSeconds/3600);
    var nextMinutes=parseInt((nextShowTimeSeconds-nextHours*3600)/60);
    var nextSeconds=nextShowTimeSeconds%60;

    var curHours=parseInt(curShowTimeSeconds/3600);
    var curMinutes=parseInt((curShowTimeSeconds-curHours*3600)/60);
    var curSeconds=curShowTimeSeconds%60;

    if(curSeconds!=nextSeconds){
        if(parseInt(curHours/10)!=parseInt(nextHours/10)){
            addBalls(MARGIN_LEFT+0,MARGIN_TOP,parseInt(curHours/10));
        }
        if(parseInt(curHours%10)!=parseInt(nextHours%10)){
            addBalls(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(curHours%10));
        }
        if(parseInt(curMinutes/10)!=parseInt(nextMinutes/10)){
            addBalls(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes/10));
        }
        if(parseInt(curMinutes%10)!=parseInt(nextMinutes%10)){
            addBalls(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes%10));
        }
        if(parseInt(curSeconds/10)!=parseInt(nextSeconds/10)){
            addBalls(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds/10));
        }
        if(parseInt(curSeconds%10)!=parseInt(nextSeconds%10)){
            addBalls(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds%10));

        }
        curShowTimeSeconds=nextShowTimeSeconds;
    }
    updateBalls();
}

function updateBalls(){
    for(var i=0;i<balls.length;i++){
        balls[i].x+=balls[i].vx;
        balls[i].y+=balls[i].vy;
        balls[i].vy+=balls[i].g;

        if(balls[i].y>=WINDOW_HEIGHT-RADIUS){
            balls[i].y=WINDOW_HEIGHT-RADIUS;
            balls[i].vy=-balls[i].vy*0.75;
        }

    }
}
function addBalls(x,y,num){
    for( var i = 0 ; i < digit[num].length ; i ++ )
        for(var j = 0 ; j < digit[num][i].length ; j ++ )
            if( digit[num][i][j] == 1 ){
                var aBall={
                     x:x+j*2*(RADIUS+1)+(RADIUS+1),
                     y:y+j*2*(RADIUS+1)+(RADIUS+1),
                     g:1.5+Math.random(),
                     vx:Math.pow(-1,Math.ceil(Math.random()*1000))*4,
                     vy:-5,
                     color:colors[Math.floor(Math.random()*colors.length)]
                 }
                 balls.push(aBall);
            }
    
         
     
}
function render(cxt){
    cxt.clearRect(0,0,WINDOW_WIDTH,WINDOW_HEIGHT);
    var hours=parseInt(curShowTimeSeconds/3600);
    var minutes=parseInt((curShowTimeSeconds-hours*3600)/60);
    var seconds=curShowTimeSeconds%60;

    renderDigit(MARGIN_LEFT,MARGIN_TOP,parseInt(hours/10),cxt);
    renderDigit(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(hours%10),cxt);
    renderDigit(MARGIN_LEFT+30*(RADIUS+1),MARGIN_TOP,10,cxt);
    renderDigit(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(minutes/10),cxt);
    renderDigit(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(minutes%10),cxt);
    renderDigit(MARGIN_LEFT+69*(RADIUS+1),MARGIN_TOP,10,cxt);
    renderDigit(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(seconds/10),cxt);
    renderDigit(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(seconds%10),cxt);
    
    for(var i=0;i<balls.length;i++){
        cxt.fillStyle=balls[i].color;

        cxt.beginPath();
        cxt.arc(balls[i].x,balls[i].y,RADIUS,0,2*Math.PI,true);
        cxt.closePath();
        cxt.fill();
    }

}
function renderDigit( x , y , num , cxt ){

    cxt.fillStyle = "rgb(0,102,153)";

    for( var i = 0 ; i < digit[num].length ; i ++ )
        for(var j = 0 ; j < digit[num][i].length ; j ++ )
            if( digit[num][i][j] == 1 ){
                cxt.beginPath();
                cxt.arc( x+j*2*(RADIUS+1)+(RADIUS+1) , y+i*2*(RADIUS+1)+(RADIUS+1) , RADIUS , 0 , 2*Math.PI )
                cxt.closePath()

                cxt.fill()
            }
}