// ==UserScript==
// @name         click beatiful
// @namespace    http://tampermonkey.net/
// @version      0.1.1
// @description  会在你点击鼠标时生成特效，并且会持续生成流星雨特效，美观又时尚(如果出现bug，请打开开发人员模式)
// @author       BarkFlorr
// @match        https://*/*
// @match        http://*/*
// @grant        none
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';
    function clickEffect() {
        let balls = [];
        let longPressed = false;
        let longPress;
        let multiplier = 0;
        let width, height;
        let origin;
        let normal;
        let ctx;
        const colours = ["#F73859", "#14FFEC", "#00E0FF", "#FF99FE", "#FAF15D"];
        const canvas = document.createElement("canvas");
        document.body.appendChild(canvas);
        canvas.setAttribute("style", "width: 100%; height: 100%; top: 0; left: 0; z-index: 99999; position: fixed; pointer-events: none;");
        const pointer = document.createElement("span");
        pointer.classList.add("pointer");
        document.body.appendChild(pointer);

        if (canvas.getContext && window.addEventListener) {
            ctx = canvas.getContext("2d");
            updateSize();
            window.addEventListener('resize', updateSize, false);
            loop();
            window.addEventListener("mousedown", function(e) {
                pushBalls(randBetween(10, 15), e.clientX, e.clientY);
                document.body.classList.add("is-pressed");
                longPress = setTimeout(function(){
                    document.body.classList.add("is-longpress");
                    longPressed = true;
                }, 500);
            }, false);
            window.addEventListener("mouseup", function(e) {
                clearInterval(longPress);
                if (longPressed == true) {
                    document.body.classList.remove("is-longpress");
                    pushBalls(randBetween(50 + Math.ceil(multiplier), 100 + Math.ceil(multiplier)), e.clientX, e.clientY);
                    longPressed = false;
                }
                document.body.classList.remove("is-pressed");
            }, false);
        } else {
            console.log("canvas or addEventListener is unsupported!");
        }


        function updateSize() {
            canvas.width = window.innerWidth * 2;
            canvas.height = window.innerHeight * 2;
            canvas.style.width = window.innerWidth + 'px';
            canvas.style.height = window.innerHeight + 'px';
            ctx.scale(2, 2);
            width = (canvas.width = window.innerWidth);
            height = (canvas.height = window.innerHeight);
            origin = {
                x: width / 2,
                y: height / 2
            };
            normal = {
                x: width / 2,
                y: height / 2
            };
        }
        class Ball {
            constructor(x = origin.x, y = origin.y) {
                this.x = x;
                this.y = y;
                this.angle = Math.random() * 2 * Math.PI;
                if (longPressed == true) {
                    this.multiplier = randBetween(14 + multiplier, 15 + multiplier);
                } else {
                    this.multiplier = randBetween(6, 12);
                }
                this.vx = (this.multiplier + Math.random()) * Math.cos(this.angle);
                this.vy = (this.multiplier + Math.random()) * Math.sin(this.angle);
                this.r = randBetween(4, 0);
                this.color = colours[Math.floor(Math.random() * colours.length)];
            }
            update() {
                this.x += this.vx - normal.x;
                this.y += this.vy - normal.y;
                normal.x = -2 / window.innerWidth * Math.sin(this.angle);
                normal.y = -2 / window.innerHeight * Math.cos(this.angle);
                this.vx *= 1;
                this.vy *= 1;
            }
        }

        function pushBalls(count = 1, x = origin.x, y = origin.y) {
            for (let i = 0; i < count; i++) {
                balls.push(new Ball(x, y));
            }
        }

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

        function loop() {
            ctx.fillStyle = "rgba(255, 255, 255, 0)";
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            for (let i = 0; i < balls.length; i++) {
                let b = balls[i];
                if (b.r < 0) continue;
                ctx.fillStyle = b.color;
                ctx.beginPath();
                ctx.arc(b.x, b.y, b.r, 0, Math.PI * 2, false);
                ctx.fill();
                b.update();
            }
            if (longPressed == true) {
                multiplier += 0.2;
            } else if (!longPressed && multiplier >= 0) {
                multiplier -= 0.4;
            }
            removeBall();
            requestAnimationFrame(loop);
        }

        function removeBall() {
            for (let i = 0; i < balls.length; i++) {
                let b = balls[i];
                if (b.x + b.r < 0 || b.x - b.r > width || b.y + b.r < 0 || b.y - b.r > height || b.r < 0) {
                    balls.splice(i, 1);
                }
            }
        }

        function pushBallsFromTopLeft() {
            let x = randBetween(0, width);
            let y = randBetween(0, height);
            let xxx = randBetween(0, 2);
            if(xxx==0) x=0;
            else y=0;
            let angle = Math.atan2(height, width);
            let ball = new Ball(x, y);
            ball.vx = (ball.multiplier + Math.random()) * Math.cos(angle);
            ball.vy = (ball.multiplier + Math.random()) * Math.sin(angle);
            balls.push(ball);
        }

        setInterval(pushBallsFromTopLeft, 30);

    }
    clickEffect();
})();