/*
DVD Screensaver JS v1.0.0
Copyright 2019 Yaroslav de la Peña Smirnov
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted (subject to the limitations in the disclaimer
below) provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

    * Neither the name of the copyright holder nor the names of its
    contributors may be used to endorse or promote products derived from this
    software without specific prior written permission.

NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY
THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/

function playDVD(options={}){
    /* >>> Parameters <<<
    There are just two customizable parameters
    The speed in pixels/s
    And a list of colors
    */
    var speed = options.hasOwnProperty('speed') ? options['speed'] : 200;
    var colors = [
        "#012fff",
        "#ff2190",
        "#ce21ff",
        "#ffec00",
        "#ff8702"
    ];
    try{
        if(options["colors"].length > 0){
            colors = option["colors"];
        }
    }
    catch(e){}

    var canvas = document.getElementById("dvd");
    if(!canvas){
        console.log("There is no #dvd canvas to draw on! Aborting...");
        return;
    }
    var container = canvas.parentNode;
    var ctx = canvas.getContext("2d");
    ctx.fillStyle = colors[0];
    ctx.save();

    /* >>> State variables <<<
    px, py are the current coordinates
    direction is an array with the direction for the x and y axis [x, y]
    either 1 or -1 for each axis
    boundx, boundy the boundaries for each axis
    last is the timestamp of the last rendered frame
    */
    var px = 0;
    var py = 0;
    var direction = [1, 1];
    var boundx;
    var boundy;
    var last = null;

    function randomRange(min, max){
        return Math.floor(Math.random() * (max - min - 1)) + min;
    }

    function randomInt(max){
        return Math.floor(Math.random() * max);
    }

    function resize(){
        // On window/viewport resize, get the new size of the container
        // and accordingly resize the canvas, then reinitialize
        canvas.height = parseInt(container.offsetHeight);
        canvas.width = parseInt(container.offsetWidth);
        boundx = canvas.width - 340;
        boundy = canvas.height - 154;
        try{ window.cancelAnimationFrame(requestedFrame); }
        catch(e) {}
        initDVD();
    }

    function bounce(){
        // Change the direction after reaching the boundaries of the canvas
        if(px === boundx)
            direction[0] = -1;
        else if(px == 0)
            direction[0] = 1;
        if(py === boundy)
            direction[1] = -1;
        else if(py == 0)
            direction[1] = 1;
        // Change the color randomly
        if (colors.length > 1){
            ctx.restore();
            ctx.fillStyle = colors[randomRange(0, colors.length+1)];
            ctx.save();
        }
    }

    function initDVD(){
        px = randomRange(0, boundx);
        py = randomRange(0, boundy);
        bounce();
        drawLogo();
        requestedFrame = window.requestAnimationFrame(nextFrame);
    }

    function drawLogo(){
        ctx.translate(px, py);
        ctx.fill(logoPath);
        ctx.restore();
        ctx.save();
    }

    function nextFrame(timestamp){
        if(!last) last = timestamp;
        let delta = timestamp - last;
        // If more than 250ms have passed since last frame, it is assumed
        // that the browser stopped calling back frames because the tab/page
        // was in the background, thus this frame is ignored, and the last
        // timestamp reset
        if (delta > 250){
            last = timestamp;
            requestedFrame = window.requestAnimationFrame(nextFrame);
            return;
        }

        ctx.clearRect(0, 0, canvas.width, canvas.height);
        px += delta*speed*direction[0]/1000;
        py += delta*speed*direction[1]/1000;

        // If px and/or py are out of bounds, equal them to the boundaries
        // and change direction and color
        px = px > boundx ? boundx : px;
        py = py > boundy ? boundy : py;
        px = px < 0 ? 0 : px;
        py = py < 0 ? 0 : py;
        if (px === boundx || py === boundy || px == 0 || py == 0)
            bounce();
        drawLogo();
        last = timestamp;
        requestedFrame = window.requestAnimationFrame(nextFrame);
    }

    resize();
    window.addEventListener("resize", resize);
}

// This is the path for the logo, it is just a 'd' SVG string
// You can easily 'export' the logo to SVG by copying the string to a
// 'path' tag's 'd' attribute inside an SVG document with size of 340x154px
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