(function () {
    "use strict";
    var num = 200;
    var w = window.innerWidth;
    var h = window.innerHeight;
    var max = 100;
    var _x = 0;
    var _y = 0;
    var _z = 150;
    var dtr = function (d) {
        return d * Math.PI / 180;
    };

    var rnd = function () {
        return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180);
    };
    var dist = function (p1, p2, p3) {
        return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2));
    };

    var cam = {
        obj: {
            x: _x,
            y: _y,
            z: _z
        },
        dest: {
            x: 0,
            y: 0,
            z: 1
        },
        dist: {
            x: 0,
            y: 0,
            z: 200
        },
        ang: {
            cplane: 0,
            splane: 0,
            ctheta: 0,
            stheta: 0
        },
        zoom: 1,
        disp: {
            x: w / 2,
            y: h / 2,
            z: 0
        },
        upd: function () {
            cam.dist.x = cam.dest.x - cam.obj.x;
            cam.dist.y = cam.dest.y - cam.obj.y;
            cam.dist.z = cam.dest.z - cam.obj.z;
            cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
            cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
            cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
            cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
        }
    };

    var trans = {
        parts: {
            sz: function (p, sz) {
                return {
                    x: p.x * sz.x,
                    y: p.y * sz.y,
                    z: p.z * sz.z
                };
            },
            rot: {
                x: function (p, rot) {
                    return {
                        x: p.x,
                        y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
                        z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
                    };
                },
                y: function (p, rot) {
                    return {
                        x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
                        y: p.y,
                        z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
                    };
                },
                z: function (p, rot) {
                    return {
                        x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
                        y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
                        z: p.z
                    };
                }
            },
            pos: function (p, pos) {
                return {
                    x: p.x + pos.x,
                    y: p.y + pos.y,
                    z: p.z + pos.z
                };
            }
        },
        pov: {
            plane: function (p) {
                return {
                    x: p.x * cam.ang.cplane + p.z * cam.ang.splane,
                    y: p.y,
                    z: p.x * -cam.ang.splane + p.z * cam.ang.cplane
                };
            },
            theta: function (p) {
                return {
                    x: p.x,
                    y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta,
                    z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta
                };
            },
            set: function (p) {
                return {
                    x: p.x - cam.obj.x,
                    y: p.y - cam.obj.y,
                    z: p.z - cam.obj.z
                };
            }
        },
        persp: function (p) {
            return {
                x: p.x * cam.dist.z / p.z * cam.zoom,
                y: p.y * cam.dist.z / p.z * cam.zoom,
                z: p.z * cam.zoom,
                p: cam.dist.z / p.z
            };
        },
        disp: function (p, disp) {
            return {
                x: p.x + disp.x,
                y: -p.y + disp.y,
                z: p.z + disp.z,
                p: p.p
            };
        },
        steps: function (_obj_, sz, rot, pos, disp) {
            var _args = trans.parts.sz(_obj_, sz);
            _args = trans.parts.rot.x(_args, rot);
            _args = trans.parts.rot.y(_args, rot);
            _args = trans.parts.rot.z(_args, rot);
            _args = trans.parts.pos(_args, pos);
            _args = trans.pov.plane(_args);
            _args = trans.pov.theta(_args);
            _args = trans.pov.set(_args);
            _args = trans.persp(_args);
            _args = trans.disp(_args, disp);
            return _args;
        }
    };


    var threeD = function (param) {
        this.transIn = {};
        this.transOut = {};
        this.transIn.vtx = (param.vtx);
        this.transIn.sz = (param.sz);
        this.transIn.rot = (param.rot);
        this.transIn.pos = (param.pos);
    };

    threeD.prototype.vupd = function () {
        this.transOut = trans.steps(
            this.transIn.vtx,
            this.transIn.sz,
            this.transIn.rot,
            this.transIn.pos,
            cam.disp
        );
    };

    var Build = function () {
        this.vel = 0.04;
        this.lim = 360;
        this.diff = 200;
        this.initPos = 100;
        this.toX = _x;
        this.toY = _y;
        this.go();
    };

    Build.prototype.go = function () {
        this.canvas = document.getElementById("canvas");
        this.canvas.width = window.innerWidth;
        this.canvas.height = window.innerHeight;
        this.$ = this.canvas.getContext("2d");
        this.$.globalCompositeOperation = 'source-over';
        this.varr = [];
        this.dist = [];
        this.calc = [];

        for (var i = 0, len = num; i < len; i++) {
            this.add();
        }

        this.rotObj = {
            x: 0,
            y: 0,
            z: 0
        };
        this.objSz = {
            x: w / 5,
            y: h / 5,
            z: w / 5
        };
    };

    Build.prototype.add = function () {
        this.varr.push(new threeD({
            vtx: {
                x: rnd(),
                y: rnd(),
                z: rnd()
            },
            sz: {
                x: 0,
                y: 0,
                z: 0
            },
            rot: {
                x: 20,
                y: -20,
                z: 0
            },
            pos: {
                x: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
                y: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
                z: this.diff * Math.sin(360 * Math.random() * Math.PI / 180)
            }
        }));
        this.calc.push({
            x: 360 * Math.random(),
            y: 360 * Math.random(),
            z: 360 * Math.random()
        });
    };

    Build.prototype.upd = function () {
        cam.obj.x += (this.toX - cam.obj.x) * 0.05;
        cam.obj.y += (this.toY - cam.obj.y) * 0.05;
    };

    Build.prototype.draw = function () {
        this.$.clearRect(0, 0, this.canvas.width, this.canvas.height);
        cam.upd();
        this.rotObj.x += 0.1;
        this.rotObj.y += 0.1;
        this.rotObj.z += 0.1;

        for (var i = 0; i < this.varr.length; i++) {
            for (var val in this.calc[i]) {
                if (this.calc[i].hasOwnProperty(val)) {
                    this.calc[i][val] += this.vel;
                    if (this.calc[i][val] > this.lim) this.calc[i][val] = 0;
                }
            }

            this.varr[i].transIn.pos = {
                x: this.diff * Math.cos(this.calc[i].x * Math.PI / 180),
                y: this.diff * Math.sin(this.calc[i].y * Math.PI / 180),
                z: this.diff * Math.sin(this.calc[i].z * Math.PI / 180)
            };
            this.varr[i].transIn.rot = this.rotObj;
            this.varr[i].transIn.sz = this.objSz;
            this.varr[i].vupd();
            if (this.varr[i].transOut.p < 0) continue;
            var g = this.$.createRadialGradient(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p, this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2);
            this.$.globalCompositeOperation = 'lighter';
            g.addColorStop(0, 'hsla(255, 255%, 255%, 1)');
            g.addColorStop(.5, 'hsla(' + (i + 2) + ',85%, 40%,1)');
            g.addColorStop(1, 'hsla(' + (i) + ',85%, 40%,.5)');
            this.$.fillStyle = g;
            this.$.beginPath();
            this.$.arc(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2, 0, Math.PI * 2, false);
            this.$.fill();
            this.$.closePath();
        }
    };
    Build.prototype.anim = function () {
        window.requestAnimationFrame = (function () {
            return window.requestAnimationFrame ||
                function (callback, element) {
                    window.setTimeout(callback, 1000 / 60);
                };
        })();
        var anim = function () {
            this.upd();
            this.draw();
            window.requestAnimationFrame(anim);
        }.bind(this);
        window.requestAnimationFrame(anim);
    };

    Build.prototype.run = function () {
        this.anim();

        window.addEventListener('mousemove', function (e) {
            this.toX = (e.clientX - this.canvas.width / 2) * -0.8;
            this.toY = (e.clientY - this.canvas.height / 2) * 0.8;
        }.bind(this));
        window.addEventListener('touchmove', function (e) {
            e.preventDefault();
            this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8;
            this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8;
        }.bind(this));
        window.addEventListener('mousedown', function (e) {
            for (var i = 0; i < 100; i++) {
                this.add();
            }
        }.bind(this));
        window.addEventListener('touchstart', function (e) {
            e.preventDefault();
            for (var i = 0; i < 100; i++) {
                this.add();
            }
        }.bind(this));
        window.addEventListener('resize', function () {
            app.canvas.width = w = window.innerWidth;
            app.canvas.height = h = window.innerHeight;
        }, false);
    };
    var app = new Build();
    app.run();
})();
