// ==UserScript==
// @name				elegant alert()
// @name:zh-CN			优雅的 alert()
// @name:zh-TW			優雅的 alert()
// @description			Display a non-blocking alert box at the top right corner, and automatically close after a few seconds. Click on the alert box will close it immediately and copy the alert message to clipboard.
// @description:zh-CN	把警示窗改为显示在页面右上角，显示几秒后会自动关闭。用鼠标点按窗口会立即关闭，并把内容拷贝到系统剪贴簿。
// @description:zh-TW	把警示窗改為顯示在頁面右上角，顯示幾秒後會自動關閉。用滑鼠點按窗口會立即關閉，並把內容複製到系統剪貼簿。
// @namespace			https://greasyfork.org/zh-TW/users/393133-evan-tseng
// @author				Evan Tseng
// @version				1.09
// @include				*://*
// @run-at				document-start
// @grant				none
// @license				MIT
// @downloadURL none
// ==/UserScript==

(function() {
	'use strict';
	const boxFont = '400 15pt sans-serif',
		  boxFontColor = '#222',
		  boxBgColor = 'rgba(240,240,210,.85)',
		  boxHoverColor = 'rgba(255,255,255,.9)',
		  popFontColor = '#8ff',
		  popBgColor = '#b00',
		  countdownColor = 'rgba(100,100,240,.2)',
		  popDuration = 330,	// the period of highlight poping (micro second)
		  duration = 6400,		// message box default lifetime (micro second)

		  eaCSS = '@media screen and (max-width: 40em) { .elegantAlertBoxWrapper>div { max-width:75vw } }'+
		  '@media screen and (min-width: 40em) { .elegantAlertBoxWrapper>div { max-width:30em } }'+
		  '.elegantAlertBoxWrapper { position:fixed; top:8mm; right:12mm; max-height:calc(100vh - 13mm); z-index:2147483647; -webkit-user-select:none; user-select:none; }'+
		  '.elegantAlertBoxWrapper>div { position:relative; float:right; clear:right; font:'+ boxFont +'; line-height:1.25; color:'+ boxFontColor +'; background:'+ boxBgColor +'; padding:.1em .6em; margin-bottom:1.5mm; overflow:auto; border-radius:.7em; opacity:.2; cursor:pointer; box-shadow:inset 0 0 0 1px rgba(255,255,255,.8), 0 1px 2mm rgba(0,0,0,.7); backdrop-filter:blur(2px); -webkit-backdrop-filter:blur(2px) }'+
		  '.elegantAlertBoxWrapper .eaBar { position: absolute; left:0; top:0; width:100%; height:100%; background:'+ countdownColor +'; border-radius: 3px }'+
		  '.elegantAlertBoxWrapper>.pop { opacity:1; max-height:10em; animation: pulse1 '+ popDuration +'ms 1 }'+
		  '.elegantAlertBoxWrapper>.eaNormal { opacity:1; max-height:10em; }'+
		  '.elegantAlertBoxWrapper>.eaClose { background:'+ boxBgColor +'; opacity:0; min-height:0; max-height:0; padding-top:0; padding-bottom:0; margin:0; transition:linear .6s; -ms-overflow-style:none; scrollbar-width:none }'+
		  '.elegantAlertBoxWrapper>.eaClose::-webkit-scrollbar { display:none }'+
		  '.elegantAlertBoxWrapper>.eaNormal:hover { background:'+ boxHoverColor +'; z-index:2; box-shadow:inset 0 0 0 1px rgba(255,255,255,.8), 0 1px 2mm rgba(0,0,0,.8); transform:scale(1.05); transition:.16s }'+
		  '.elegantAlertBoxWrapper>.eaNormal:active { box-shadow:0 0 0 1px #777, inset 0 1px 2px #555; transform:scale(0.97); transition:.1s }'+
		  '@keyframes pulse1 { 0% { opacity:.5 } 10% { color:' + popFontColor + '; background:' + popBgColor + '; opacity:1; transform:scale(1.2) } 30% { transform:scale(1.1) } }';

	var cssElement = document.createElement('style');
	if(cssElement.styleSheet)	cssElement.styleSheet.cssText = eaCSS;
	else	cssElement.appendChild(document.createTextNode(eaCSS));
	cssElement.setAttribute('title', 'Elegant Alert');
	document.querySelector('head').appendChild(cssElement);

	var alertWrap = null;
	const ElegantAlertBox = function(msg, lifeTime = duration){
		if(!alertWrap) {
			alertWrap = document.createElement('div');
			alertWrap.setAttribute('class', 'elegantAlertBoxWrapper');
			document.body.appendChild(alertWrap);
		}
		this.exist = true;
		this.createBox = function(text){
			var box = this,
				alBox = document.createElement('div');
			alertWrap.appendChild(alBox);
			alBox.innerHTML = '<div class="eaBar"></div>' + text;
			alBox.setAttribute('class', 'pop');
			alBox.onclick = function(){
				let tmp = document.createElement('textArea');
				tmp.value = text;
				document.body.appendChild(tmp);
				tmp.select();
				document.execCommand('copy');
				tmp.remove();
				box.close();
			};
			return alBox;
		};
		this.show = function(){
			var box = this;
			setTimeout(function(){
				box.elm.setAttribute('class', 'eaNormal');
				box.elm.querySelector('.eaBar').setAttribute('style', 'width:0; transition:linear ' + lifeTime + 'ms');
				setTimeout(function(){
					if(box.exist) box.close();
				}, lifeTime);
			}, popDuration);
		};
		this.close = function(){
			var box = this;
			box.elm.setAttribute('class', 'eaClose');
			setTimeout(function(){
				if(box.exist) {
					box.exist = false;
					box.elm.remove();
					box.elm = null;
					if(!alertWrap.hasChildNodes()) {
						alertWrap.remove();
						alertWrap = null
					}
				}
			}, 1000);
		};
		this.elm = this.createBox(msg);
		this.show();
	};

	window.alert = function(message){
		if(document.body)	new ElegantAlertBox(message);
		else	setTimeout(function(){ window.alert(message); }, 250);
	};

})();