var serverAddress = document.getElementById("server-address").value;
var serverPort = document.getElementById("server-port").value
var socket//new WebSocket(`wss://${serverAddress}:${serverPort}`);

var canvas = document.getElementById("board");
var colorInput = document.getElementById("color");
var canvasHidden = document.getElementById("hidden");
var timer = document.getElementById("timer");

var ctx = canvas.getContext("2d");
var ctx2 = canvasHidden.getContext("2d");
var imgData = ctx2.createImageData(canvasHidden.width, canvasHidden.height)
var currentColor = "#000000"

var timeBetweenPixels = undefined;

canvas.width = 1920;
canvas.height = 1080;
canvasHidden.width = 1920;
canvasHidden.height = 1080;

function drawTimer() {
    timer.textContent = Number(timer.textContent) > 0? 
    Number(timer.textContent - 1):
    0
}

function connect() {
//    socket.close();
    serverAddress = document.getElementById("server-address").value;
    serverPort = document.getElementById("server-port").value
    console.log(`Connecting ${serverAddress}:${serverPort}`)
    socket = new WebSocket(`wss://${serverAddress}:${serverPort}`)
    // socket = new WebSocket(`wss://127.0.0.1:8080`)
    timer.textContent="Board is loading, please wait";
    socket.addEventListener("open", (event) => {
        socket.send("{\"code\":0}");
    });
    
    socket.addEventListener("message", (event) => {
        // console.log("Message from server ", JSON.stringify(event.data.toString()));
        event.data.text().then(function(packet){
            packet = JSON.parse(packet)
            let code = packet.code
            let content = packet.content
            switch (code){
                case 0:
                    timeBetweenPixels = packet.timeBetweenPixels;
                    timer.textContent = 0;
                    setInterval(() => {
                        drawTimer();
                    }, 1000);
                    console.log(`time between pixels ${timeBetweenPixels}`)
                    //Ineffective way to do that, fix that later ;)
                    let converted = Uint8ClampedArray.from(content)
    
                    for (let i = 0; i < converted.length; i ++)
                        imgData.data[i] = converted[i]
                    redraw();
                break;
                case 1:
                    contentJson = JSON.parse(content);
                    let color = {
                        r: contentJson.r,
                        g: contentJson.g,
                        b: contentJson.b
                    }

                    if (packet.pixelOwner == true) timer.textContent = timeBetweenPixels;

                    drawPixel(contentJson.x * 4, contentJson.y * 4, color)
                    redraw();
                break;
            }
        });
    });
    
    // socket.send("{\"code\":0}");
}

function drawPixel(x, y, color) {
        let pixelNumber;
        if (y > 0)
            pixelNumber = (y) * canvas.width + x
        if (y == 0)
            pixelNumber = x 
        if (color == undefined) rgbColor = hexToRgb(currentColor);
        for (let l = 0; l < 4; l ++)
            for (let l = 0; l < 5; l ++){
                imgData.data[pixelNumber + 0] = color == undefined? rgbColor.r : color.r;
                imgData.data[pixelNumber + 1] = color == undefined? rgbColor.g : color.g;
                imgData.data[pixelNumber + 2] = color == undefined? rgbColor.b : color.b;
                imgData.data[pixelNumber + 3] = 255;
            }

        redraw();
    }

function redraw() {
        ctx.save();
        ctx.setTransform(1,0,0,1,0,0);
        ctx.clearRect(0,0,canvas.width,canvas.height);
        ctx.restore();

        ctx2.putImageData(imgData, 0, 0);
        ctx.drawImage(canvasHidden, 0, 0)
        ctx.imageSmoothingEnabled = false
    }

// All the code that is making zooms and moving around cavnas is made with big help of http://phrogz.net/tmp/canvas_zoom_to_cursor.html. Thanks alot!
window.onload = function() {
    connect();
    var ctx = canvas.getContext("2d");
    trackTransforms(ctx);

    var lastX=canvas.width/2, lastY=canvas.height/2;
    var dragStart,dragged;
    canvas.addEventListener('mousedown',function(evt){
        if (evt.button == 1 || 1 == evt.button&2){
            document.body.style.mozUserSelect = document.body.style.webkitUserSelect = document.body.style.userSelect = 'none';
            lastX = evt.offsetX || (evt.pageX - canvas.offsetLeft);
            lastY = evt.offsetY || (evt.pageY - canvas.offsetTop);
            dragStart = ctx.transformedPoint(lastX,lastY);
            dragged = false;
        }
    },false);
    canvas.addEventListener('mousemove',function(evt){
        lastX = evt.offsetX || (evt.pageX - canvas.offsetLeft);
        lastY = evt.offsetY || (evt.pageY - canvas.offsetTop);
        dragged = true;
        if (dragStart){
            var pt = ctx.transformedPoint(lastX,lastY);
            ctx.translate(pt.x-dragStart.x,pt.y-dragStart.y);
            redraw();
        }
    },false);
    canvas.addEventListener('mouseup',function(evt){
        if (evt.button == 1 || 1 == evt.button&2){
            dragStart = null;
            if (dragged) {
                
                let point = ctx.transformedPoint(
                    evt.clientX - canvas.offsetLeft,
                    evt.clientY - canvas.offsetTop
                );
            } else {
                let point = {
                    x: Math.floor(ctx.transformedPoint(lastX,lastY).x) * 4,
                    y: Math.floor(ctx.transformedPoint(lastX,lastY).y) * 4,
                };
                x = point.x; y = point.y;
                let pixelNumber;
                if (y > 0)
                    pixelNumber = (y) * canvas.width + x
                if (y == 0)
                    pixelNumber = x
                
                let color = {
                    r: imgData.data[pixelNumber + 0],
                    g: imgData.data[pixelNumber + 1],
                    b: imgData.data[pixelNumber + 2]
                };

                changeColor(rgbToHex(color.r, color.g, color.b));
            }
        } else if (evt.button == 0) {
            let point = {
                    x: Math.floor(ctx.transformedPoint(lastX,lastY).x) * 4,
                    y: Math.floor(ctx.transformedPoint(lastX,lastY).y) * 4,
                };
                let rgbColor = hexToRgb(currentColor);
                let pixel = JSON.stringify({
                    "x": `${point.x/4}`,
                    "y": `${point.y/4}`,
                    "r": `${rgbColor.r}`,
                    "g": `${rgbColor.g}`,
                    "b": `${rgbColor.b}`
                });
                let packet = {
                    "code": 1,
                    "content": pixel
                }
                socket.send(JSON.stringify(packet));
                // console.log(`{\"code\":1, \"content\":${pixel}}`)

                // drawPixel(point.x, point.y, undefined);
        }
    },false);
  
    var scaleFactor = 1.1;
    var zoom = function(clicks){
        var pt = ctx.transformedPoint(lastX,lastY);
        ctx.translate(pt.x,pt.y);
        var factor = Math.pow(scaleFactor,clicks);
        ctx.scale(factor,factor);
        ctx.translate(-pt.x,-pt.y);
        redraw();
    }

    var handleScroll = function(evt){
        var delta = evt.wheelDelta ? evt.wheelDelta/40 : evt.detail ? -evt.detail : 0;
        if (delta) zoom(delta);
        return evt.preventDefault() && false;
    };
    canvas.addEventListener('DOMMouseScroll',handleScroll,false);
    canvas.addEventListener('mousewheel',handleScroll,false);
};

function evaulatePixelNumber(x, y) {   
    let pixelNumber;
    if (y > 0)
        pixelNumber = (y) * canvas.width + x
    if (y == 0)
        pixelNumber = x
    return pixelNumber
}
function changeColor(color) {
    if (color == undefined) currentColor = colorInput.value;
    else {
        currentColor = color
        colorInput.value = color
    }
}


//Code from https://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb#5624139
function hexToRgb(hex) {
    // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
    var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
    hex = hex.replace(shorthandRegex, function(m, r, g, b) {
        return r + r + g + g + b + b;
    });

    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16)
    } : null;
}

const rgbToHex = (r, g, b) => '#' + [r, g, b].map(x => {
    const hex = x.toString(16)
    return hex.length === 1 ? '0' + hex : hex
}).join('')

function trackTransforms(ctx){
    var svg = document.createElementNS("http://www.w3.org/2000/svg",'svg');
    var xform = svg.createSVGMatrix();
    ctx.getTransform = function(){ return xform; };
    
    var savedTransforms = [];
    var save = ctx.save;
    ctx.save = function(){
        savedTransforms.push(xform.translate(0,0));
        return save.call(ctx);
    };
    var restore = ctx.restore;
    ctx.restore = function(){
        xform = savedTransforms.pop();
        return restore.call(ctx);
    };

    var scale = ctx.scale;
    ctx.scale = function(sx,sy){
        xform = xform.scaleNonUniform(sx,sy);
        return scale.call(ctx,sx,sy);
    };
    var rotate = ctx.rotate;
    ctx.rotate = function(radians){
        xform = xform.rotate(radians*180/Math.PI);
        return rotate.call(ctx,radians);
    };
    var translate = ctx.translate;
    ctx.translate = function(dx,dy){
        xform = xform.translate(dx,dy);
        return translate.call(ctx,dx,dy);
    };
    var transform = ctx.transform;
    ctx.transform = function(a,b,c,d,e,f){
        var m2 = svg.createSVGMatrix();
        m2.a=a; m2.b=b; m2.c=c; m2.d=d; m2.e=e; m2.f=f;
        xform = xform.multiply(m2);
        return transform.call(ctx,a,b,c,d,e,f);
    };
    var setTransform = ctx.setTransform;
    ctx.setTransform = function(a,b,c,d,e,f){
        xform.a = a;
        xform.b = b;
        xform.c = c;
        xform.d = d;
        xform.e = e;
        xform.f = f;
        return setTransform.call(ctx,a,b,c,d,e,f);
    };
    var pt  = svg.createSVGPoint();
    ctx.transformedPoint = function(x,y){
        pt.x=x; pt.y=y;
        return pt.matrixTransform(xform.inverse());
    }
}