class VTUtils {
    static random(min, max) {
        let rand = Math.random();
        if (typeof min === 'undefined') {
            return rand;
        } else if (typeof max === 'undefined') {
            if (min instanceof Array) {
                return min[Math.floor(rand * min.length)];
            } else {
                return rand * min;
            }
        } else {
            if (min > max) {
                let tmp = min;
                min = max;
                max = tmp;
            }
            return rand * (max - min) + min;
        }
    };

    static randomInt(min, max) {
        return Math.floor(VTUtils.random(min, max));
    }

    static normalize(val, max, min) {
        return (val - min) / (max - min);
    };

    static distance(x, y, x2, y2) {
        let a = x - x2;
        let b = y - y2;

        return Math.sqrt(a * a + b * b);
    }

    static map(n, start1, stop1, start2, stop2, withinBounds) {
        let newVal = (n - start1) / (stop1 - start1) * (stop2 - start2) + start2;
        if (!withinBounds) {
            return newVal;
        }
        if (start2 < stop2) {
            return this.constrain(newVal, start2, stop2);
        } else {
            return this.constrain(newVal, stop2, start2);
        }
    };

    static constrain(n, low, high) {
        return Math.max(Math.min(n, high), low);
    }

    static hsvToRgb(h, s, v) {
        var r, g, b;

        var i = Math.floor(h * 6);
        var f = h * 6 - i;
        var p = v * (1 - s);
        var q = v * (1 - f * s);
        var t = v * (1 - (1 - f) * s);

        switch (i % 6) {
            case 0:
                r = v, g = t, b = p;
                break;
            case 1:
                r = q, g = v, b = p;
                break;
            case 2:
                r = p, g = v, b = t;
                break;
            case 3:
                r = p, g = q, b = v;
                break;
            case 4:
                r = t, g = p, b = v;
                break;
            case 5:
                r = v, g = p, b = q;
                break;
        }

        return {r: r, g: g, b: b};
    }

    static peakRGB(peak) {
        return {
            r: peak,
            g: 1 - peak,
            b: 0
        };
    }
}

class VTVector {
    constructor(x, y, z) {
        this.x = x || 0;
        this.y = y || 0;
        this.z = z || 0;
    }

    //helper
    static createRandom(x, y, z) {
        x = x || 1;
        y = y || 1;
        z = z || 0;
        return new VTVector(VTUtils.random(-x, x), VTUtils.random(-y, y), VTUtils.random(-z, z));
    }

    mult(times) {
        this.x *= times;
        this.y *= times;
        this.z *= times;
    }

    set(vector) {
        this.x = vector.x;
        this.y = vector.y;
        this.z = vector.z;
    }

    add(vector) {
        this.x = this.x + vector.x;
        this.y = this.y + vector.y;
        this.z = this.z + vector.z;
    }

    addXYZ(x, y, z) {
        this.x += x;
        this.y += y;
        this.z += z;
    }

    setXYZ(x, y, z) {
        this.x = x || 0;
        this.y = y || 0;
        this.z = z || 0;
    }

    clone() {
        return new VTVector(this.x, this.y, this.z);
    }
}

class TDUtils {
    static multiply(a, b) {
        let b00 = b[0 * 4 + 0];
        let b01 = b[0 * 4 + 1];
        let b02 = b[0 * 4 + 2];
        let b03 = b[0 * 4 + 3];
        let b10 = b[1 * 4 + 0];
        let b11 = b[1 * 4 + 1];
        let b12 = b[1 * 4 + 2];
        let b13 = b[1 * 4 + 3];
        let b20 = b[2 * 4 + 0];
        let b21 = b[2 * 4 + 1];
        let b22 = b[2 * 4 + 2];
        let b23 = b[2 * 4 + 3];
        let b30 = b[3 * 4 + 0];
        let b31 = b[3 * 4 + 1];
        let b32 = b[3 * 4 + 2];
        let b33 = b[3 * 4 + 3];
        let a00 = a[0 * 4 + 0];
        let a01 = a[0 * 4 + 1];
        let a02 = a[0 * 4 + 2];
        let a03 = a[0 * 4 + 3];
        let a10 = a[1 * 4 + 0];
        let a11 = a[1 * 4 + 1];
        let a12 = a[1 * 4 + 2];
        let a13 = a[1 * 4 + 3];
        let a20 = a[2 * 4 + 0];
        let a21 = a[2 * 4 + 1];
        let a22 = a[2 * 4 + 2];
        let a23 = a[2 * 4 + 3];
        let a30 = a[3 * 4 + 0];
        let a31 = a[3 * 4 + 1];
        let a32 = a[3 * 4 + 2];
        let a33 = a[3 * 4 + 3];
        let dst = [];
        dst[0] = b00 * a00 + b01 * a10 + b02 * a20 + b03 * a30;
        dst[1] = b00 * a01 + b01 * a11 + b02 * a21 + b03 * a31;
        dst[2] = b00 * a02 + b01 * a12 + b02 * a22 + b03 * a32;
        dst[3] = b00 * a03 + b01 * a13 + b02 * a23 + b03 * a33;
        dst[4] = b10 * a00 + b11 * a10 + b12 * a20 + b13 * a30;
        dst[5] = b10 * a01 + b11 * a11 + b12 * a21 + b13 * a31;
        dst[6] = b10 * a02 + b11 * a12 + b12 * a22 + b13 * a32;
        dst[7] = b10 * a03 + b11 * a13 + b12 * a23 + b13 * a33;
        dst[8] = b20 * a00 + b21 * a10 + b22 * a20 + b23 * a30;
        dst[9] = b20 * a01 + b21 * a11 + b22 * a21 + b23 * a31;
        dst[10] = b20 * a02 + b21 * a12 + b22 * a22 + b23 * a32;
        dst[11] = b20 * a03 + b21 * a13 + b22 * a23 + b23 * a33;
        dst[12] = b30 * a00 + b31 * a10 + b32 * a20 + b33 * a30;
        dst[13] = b30 * a01 + b31 * a11 + b32 * a21 + b33 * a31;
        dst[14] = b30 * a02 + b31 * a12 + b32 * a22 + b33 * a32;
        dst[15] = b30 * a03 + b31 * a13 + b32 * a23 + b33 * a33;
        return dst;
    }

    static xRotation(angleInRadians) {
        let c = Math.cos(angleInRadians);
        let s = Math.sin(angleInRadians);

        return [
            1, 0, 0, 0,
            0, c, s, 0,
            0, -s, c, 0,
            0, 0, 0, 1,
        ];
    }

    static yRotation(angleInRadians) {
        let c = Math.cos(angleInRadians);
        let s = Math.sin(angleInRadians);

        return [
            c, 0, -s, 0,
            0, 1, 0, 0,
            s, 0, c, 0,
            0, 0, 0, 1,
        ];
    }

    static zRotation(angleInRadians) {
        let c = Math.cos(angleInRadians);
        let s = Math.sin(angleInRadians);

        return [
            c, s, 0, 0,
            -s, c, 0, 0,
            0, 0, 1, 0,
            0, 0, 0, 1,
        ];
    }

    static degToRad(d) {
        return d * Math.PI / 180;
    }
}

function $(sel, s) {
    return $$(sel, s)[0];
}

function $$(sel, s) {
    s = s || document;
    return s.querySelectorAll(sel);
}

Node.prototype.addDelegatedEventListener = function (type, aim, cb) {
    this.addEventListener(type, (event) => {
        let target = event.target;
        if (target.matches(aim)) {
            cb(event, target);
        } else {
            let parent = target.closest(aim);
            if (parent) {
                cb(event, parent);
            }
        }
    })
};

function create(name, content) {
    let d = document.createElement(name);
    if (content) {
        d.innerHTML = content;
    }
    return d;
}

function append(to, array) {
    for (let item in array) {
        to.appendChild(array[item]);
    }
}
class ShaderHandler {
    constructor(gl) {
        this.gl = gl;
        this.shaderNames = [];
        this.shaders = {};
        this.programs = {};
    }

    setGL(gl) {
        this.gl = gl;
    }

    async loadShader(name, path) {
        this.shaderNames.push(name);
        await this.load(name, path + name + ".vert", this.gl.VERTEX_SHADER);
        await this.load(name, path + name + ".frag", this.gl.FRAGMENT_SHADER);
    }

    async load(name, url, type) {
        let realName = name + "_" + type;
        if (!this.shaders[realName]) {
            let data = await fetch(url);
            let shader = this.createShader(await data.text(), type);
            if (shader) {
                this.shaders[realName] = shader;
            }
        }
        return !!this.shaders[realName];
    }

    getShader(name, type) {
        let realName = name + "_" + type;
        return this.shaders[realName];
    }

    getAllShaders() {
        return this.shaderNames;
    }

    async createProgramForEach(arr) {
        arr = arr || this.shaderNames;
        for (let i = 0; i < arr.length; i++) {
            let shader = arr[i];
            let v = await shaderHandler.createProgram(shader, [shader])
            if (!v) {
                return false;
            }
        }
        return true;
    }

    createShader(source, type) {
        let gl = this.gl;
        let shader = gl.createShader(type);
        gl.shaderSource(shader, source);
        gl.compileShader(shader);
        if (gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
            return shader;
        }
        console.error(gl.getShaderInfoLog(shader));
        gl.deleteShader(shader);
        return null;
    }

    createProgram(name, shaders) {
        let gl = this.gl;
        let pro = gl.createProgram();
        for (let i = 0; i < shaders.length; i++) {
            gl.attachShader(pro, this.getShader(shaders[i], gl.VERTEX_SHADER));
            gl.attachShader(pro, this.getShader(shaders[i], gl.FRAGMENT_SHADER));
        }
        gl.linkProgram(pro);
        var success = gl.getProgramParameter(pro, gl.LINK_STATUS);
        if (success) {
            this.programs[name] = pro;
            return pro;
        }

        console.log(gl.getProgramInfoLog(pro));
        gl.deleteProgram(pro);
        return null;
    }

    getProgram(name) {
        return this.programs[name];
    }

    async loadArray(list, path) {
        let self = this;
        for (const e of list) {
            await self.loadShader(e, path)
        }
        await self.createProgramForEach(list)
    }
}
class AudioHandler {
    async init() {
        this.audioFile = new Audio();
    }
}
class Player {
    async init() {

    }
}
class GUI {
    init() {

    }
}
class Visual {
    constructor() {
        this.data = []; //for drawing
        this.dataArray = [];
    }
    draw() {
    }

    setup() {
    }
}

class VisualDrawer {

}
class Sphere extends Visual {
    draw() {
    }

    setup() {
    }
}
const shaderHandler = new ShaderHandler(null),
    audioHandler = new AudioHandler(),
    gui = new GUI(),
    player = new Player();

async function startUP() {
    let c = document.body.querySelector('#c'),
        gl = c.getContext("webgl2");
    if (!gl) {
        alert("SORRY THE BROWSER DOESN'T SUPPORT WEBGL2");
        return false;
    }
    shaderHandler.setGL(gl)
    await shaderHandler.loadArray(["wave", "sphere"], 'shaders/');
    await audioHandler.init();
    await player.init();
    gui.init();
}

startUP().then(r => {
    setTimeout(e => {
        $('.loading-screen').remove();
    }, 100)
});