// ==UserScript==
// @name        Video Full Screen In Tab
// @namespace   http://www.icycat.com
// @description 让所有视频网页全屏
// @author      冻猫
// @include     *
// @version     2.1
// @grant       none
// @run-at      document-end
// @downloadURL none
// ==/UserScript==

(function() {

	var isOver = false,
		fullStatus = false,
		parentArray = new Array(),
		parentStyle = new Array(),
		player, parent, backStyle, controlBtn, leftBtn, rightBtn, observer;

	createButton();
	createFullButton();

	document.addEventListener('mouseover', getPlayer, false);

	function getPlayer(e) {
		if (fullStatus) return;
		var target = e.target;
		var nodeName = target.nodeName;
		switch (nodeName) {
			case 'OBJECT':
			case 'EMBED':
				if (target.type == 'application/x-shockwave-flash' && target.offsetWidth > 299 && target.offsetHeight > 199) {
					player = target;
					buttonRect();
				}
				break;
			case 'IFRAME':
			case 'VIDEO':
				if (target.offsetWidth > 299 && target.offsetHeight > 199) {
					player = target;
					buttonRect();
				}
				break;
			default:
				if (isOver) return;
				controlBtn.style.opacity = '0';
				controlBtn.style.visibility = 'hidden';
				return;
		}
	}

	function createButton() {
		addStyle('#playerControlBtn {visibility:hidden;opacity:0;cursor: pointer;font: 12px "微软雅黑";padding: 2px 2px 3px 2px;margin:0;width:60px;height:16px;text-align: center;transition: all 0.5s ease-out;position: absolute;z-index:2147483646;background-color: #27A9D8;color: #FFF;}');
		var btn = document.createElement('tbdiv');
		btn.id = 'playerControlBtn';
		btn.onclick = function() {
			playerControl();
		};
		btn.onmouseover = function() {
			isOver = true;
			controlBtn.style.visibility = 'visible';
			controlBtn.style.opacity = '1';
		};
		btn.onmouseout = function() {
			isOver = false;
		}
		btn.appendChild(document.createTextNode('网页全屏'));
		document.body.appendChild(btn);
		controlBtn = document.getElementById('playerControlBtn');
	}

	function createFullButton() {
		var leftButton = document.createElement('tbdiv');
		leftButton.id = 'leftFullStackButton';
		leftButton.onclick = function() {
			playerControl();
		};
		document.body.appendChild(leftButton);
		addStyle('#leftFullStackButton{display:none;position:fixed;width:1px;height:100%;top:0;left:0;z-index:2147483646;}');
		var rightButton = document.createElement('tbdiv');
		rightButton.id = 'rightFullStackButton';
		rightButton.onclick = function() {
			playerControl();
		};
		document.body.appendChild(rightButton);
		addStyle('#rightFullStackButton{display:none;position:fixed;width:1px;height:100%;top:0;right:0;z-index:2147483646;}');
		leftBtn = document.getElementById('leftFullStackButton');
		rightBtn = document.getElementById('rightFullStackButton');
	}

	function buttonRect() {
		var rect = player.getBoundingClientRect();
		var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
		var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
		var top = rect.top + scrollTop;
		var left = rect.left + scrollLeft;
		controlBtn.style.top = (top - 21) + 'px';
		controlBtn.style.left = (left + player.offsetWidth - 64) + 'px';
		controlBtn.style.visibility = 'visible';
		controlBtn.style.opacity = '0.5';
	}

	function addStyle(css) {
		var style = document.createElement('style');
		style.type = 'text/css';
		var node = document.createTextNode(css);
		style.appendChild(node);
		document.head.appendChild(style);
	}

	function playerControl() {
		checkPlayer();
		if (!fullStatus) {
			fullWin();
			if (!observer) {
				observer = new MutationObserver(function(mutation) {
					observer.disconnect();
					if (parent.style.width != '100%') {
						backStyle.parentWidth = parent.style.width;
					}
					if (parent.style.height != '100%') {
						backStyle.parentHeight = parent.style.height;
					}
					resizeHandle();
					observer.observe(parent, {
						'attributes': true
					});
				});
			}
			observer.observe(parent, {
				'attributes': true
			});
		} else {
			observer.disconnect();
			smallWin();
		}
	}

	function checkPlayer() {
		parentArray = [];
		parent = null;
		var full = player;
		while (full = full.parentNode) {
			if (full.getAttribute && full.nodeName != 'OBJECT') {
				if (!parent) {
					parent = full;
				} else {
					parentArray.push(full);
				}
			}
			if (full.nodeName == 'HTML') break;
		}
	}

	function resizeHandle() {
		if (parent.style.width != '100%' || parent.style.height != '100%') {
			fullWin();
		}
	}

	function fullWin() {
		if (!fullStatus) {
			window.addEventListener('resize', resizeHandle, false);
			backStyle = {
				html: document.body.parentNode.style.overflow,
				body: document.body.style.overflow,
				parent: parent.style.cssText,
				parentWidth: parent.style.width,
				parentHeight: parent.style.height,
				player: player.style.cssText
			};
			leftBtn.style.display = 'block';
			rightBtn.style.display = 'block';
			controlBtn.style.display = 'none';
			controlBtn.style.visibility = 'hidden';
		}
		document.body.parentNode.style.overflow = 'hidden';
		document.body.style.overflow = 'hidden';
		for (var i = 0; i < parentArray.length; i++) {
			if (!fullStatus) {
				parentStyle[i] = {
					position: parentArray[i].style.position
				};
			}
			parentArray[i].style.setProperty('position', 'static', 'important');
		}
		parent.style.cssText = 'width:100%;height:100%;margin:0px !important;padding:0px !important;top:0px !important;left:0px !important;z-index:2147483645 !important;overflow:hidden !important;position:fixed !important;background:#000 !important;border:none !important;display:inline !important;';
		player.style.cssText = 'width:calc(100% - 2px) !important;height:100% !important;z-index:2147483645 !important;position:relative !important;visibility:visible !important;display:inline !important;';
		var rect = player.getBoundingClientRect();
		player.style.left = (1 - rect.left) + 'px';
		player.style.top = (0 - rect.top) + 'px';
		fullStatus = true;
	}

	function smallWin() {
		window.removeEventListener('resize', resizeHandle, false);
		document.body.parentNode.style.overflow = backStyle.html;
		document.body.style.overflow = backStyle.body;
		for (var i = 0; i < parentArray.length; i++) {
			parentArray[i].style.position = parentStyle[i].position;
		}
		parent.style.cssText = backStyle.parent;
		parent.style.width = backStyle.parentWidth;
		parent.style.height = backStyle.parentHeight;
		player.style.cssText = backStyle.player;
		leftBtn.style.display = 'none';
		rightBtn.style.display = 'none';
		controlBtn.style.display = 'block';
		fullStatus = false;
	}

})();