function _get(val) {
	return K(val)[0];
}

function _getDoc(node) {
	if (!node) {
		return document;
	}
	return node.ownerDocument || node.document || node;
}

function _getWin(node) {
	if (!node) {
		return window;
	}
	var doc = _getDoc(node);
	return doc.parentWindow || doc.defaultView;
}

function _setHtml(el, html) {
	if (el.nodeType != 1) {
		return;
	}
	var doc = _getDoc(el);
	try {
		el.innerHTML = '<img id="__kindeditor_temp_tag__" width="0" height="0" style="display:none;" />' + html;
		var temp = doc.getElementById('__kindeditor_temp_tag__');
		temp.parentNode.removeChild(temp);
	} catch(e) {
		// bugfix: 在IE上innerHTML有时候报错
		K(el).empty();
		K('@' + html, doc).each(function() {
			el.appendChild(this);
		});
	}
}

function _hasClass(el, cls) {
	return _inString(cls, el.className, ' ');
}

function _setAttr(el, key, val) {
	if (_IE && _V < 8 && key.toLowerCase() == 'class') {
		key = 'className';
	}
	el.setAttribute(key, '' + val);
}

function _removeAttr(el, key) {
	if (_IE && _V < 8 && key.toLowerCase() == 'class') {
		key = 'className';
	}
	_setAttr(el, key, '');
	el.removeAttribute(key);
}

function _getNodeName(node) {
	if (!node || !node.nodeName) {
		return '';
	}
	return node.nodeName.toLowerCase();
}

function _computedCss(el, key) {
	var self = this, win = _getWin(el), camelKey = _toCamel(key), val = '';
	if (win.getComputedStyle) {
		var style = win.getComputedStyle(el, null);
		val = style[camelKey] || style.getPropertyValue(key) || el.style[camelKey];
	} else if (el.currentStyle) {
		val = el.currentStyle[camelKey] || el.style[camelKey];
	}
	return val;
}

function _hasVal(node) {
	return !!_VALUE_TAG_MAP[_getNodeName(node)];
}

function _docElement(doc) {
	doc = doc || document;
	return _QUIRKS ? doc.body : doc.documentElement;
}

function _docHeight(doc) {
	var el = _docElement(doc);
	return Math.max(el.scrollHeight, el.clientHeight);
}

function _docWidth(doc) {
	var el = _docElement(doc);
	return Math.max(el.scrollWidth, el.clientWidth);
}

function _getScrollPos(doc) {
	doc = doc || document;
	var x, y;
	if (_IE || _NEWIE || _OPERA) {
		x = _docElement(doc).scrollLeft;
		y = _docElement(doc).scrollTop;
	} else {
		x = _getWin(doc).scrollX;
		y = _getWin(doc).scrollY;
	}
	return {x : x, y : y};
}

// create KNode class
function KNode(node) {
	this.init(node);
}
_extend(KNode, {
	init : function(node) {
		var self = this;
		node = _isArray(node) ? node : [node];
		var length = 0;
		for (var i = 0, len = node.length; i < len; i++) {
			if (node[i]) {
				self[i] = node[i].constructor === KNode ? node[i][0] : node[i];
				length++;
			}
		}
		self.length = length;
		self.doc = _getDoc(self[0]);
		self.name = _getNodeName(self[0]);
		self.type = self.length > 0 ? self[0].nodeType : null;
		self.win = _getWin(self[0]);
	},
	each : function(fn) {
		var self = this;
		for (var i = 0; i < self.length; i++) {
			if (fn.call(self[i], i, self[i]) === false) {
				return self;
			}
		}
		return self;
	},
	bind : function(type, fn) {
		this.each(function() {
			_bind(this, type, fn);
		});
		return this;
	},
	unbind : function(type, fn) {
		this.each(function() {
			_unbind(this, type, fn);
		});
		return this;
	},
	fire : function(type) {
		if (this.length < 1) {
			return this;
		}
		_fire(this[0], type);
		return this;
	},
	hasAttr : function(key) {
		if (this.length < 1) {
			return false;
		}
		return !!_getAttr(this[0], key);
	},
	attr : function(key, val) {
		var self = this;
		if (key === undefined) {
			return _getAttrList(self.outer());
		}
		if (typeof key === 'object') {
			_each(key, function(k, v) {
				self.attr(k, v);
			});
			return self;
		}
		if (val === undefined) {
			val = self.length < 1 ? null : _getAttr(self[0], key);
			return val === null ? '' : val;
		}
		self.each(function() {
			_setAttr(this, key, val);
		});
		return self;
	},
	removeAttr : function(key) {
		this.each(function() {
			_removeAttr(this, key);
		});
		return this;
	},
	get : function(i) {
		if (this.length < 1) {
			return null;
		}
		return this[i || 0];
	},
	eq : function(i) {
		if (this.length < 1) {
			return null;
		}
		return this[i] ? new KNode(this[i]) : null;
	},
	hasClass : function(cls) {
		if (this.length < 1) {
			return false;
		}
		return _hasClass(this[0], cls);
	},
	addClass : function(cls) {
		this.each(function() {
			if (!_hasClass(this, cls)) {
				this.className = _trim(this.className + ' ' + cls);
			}
		});
		return this;
	},
	removeClass : function(cls) {
		this.each(function() {
			if (_hasClass(this, cls)) {
				this.className = _trim(this.className.replace(new RegExp('(^|\\s)' + cls + '(\\s|$)'), ' '));
			}
		});
		return this;
	},
	html : function(val) {
		var self = this;
		if (val === undefined) {
			if (self.length < 1 || self.type != 1) {
				return '';
			}
			return _formatHtml(self[0].innerHTML);
		}
		self.each(function() {
			_setHtml(this, val);
		});
		return self;
	},
	text : function() {
		var self = this;
		if (self.length < 1) {
			return '';
		}
		return _IE ? self[0].innerText : self[0].textContent;
	},
	hasVal : function() {
		if (this.length < 1) {
			return false;
		}
		return _hasVal(this[0]);
	},
	val : function(val) {
		var self = this;
		if (val === undefined) {
			if (self.length < 1) {
				return '';
			}
			return self.hasVal() ? self[0].value : self.attr('value');
		} else {
			self.each(function() {
				if (_hasVal(this)) {
					this.value = val;
				} else {
					_setAttr(this, 'value' , val);
				}
			});
			return self;
		}
	},
	css : function(key, val) {
		var self = this;
		if (key === undefined) {
			return _getCssList(self.attr('style'));
		}
		if (typeof key === 'object') {
			_each(key, function(k, v) {
				self.css(k, v);
			});
			return self;
		}
		if (val === undefined) {
			if (self.length < 1) {
				return '';
			}
			return self[0].style[_toCamel(key)] || _computedCss(self[0], key) || '';
		}
		self.each(function() {
			this.style[_toCamel(key)] = val;
		});
		return self;
	},
	width : function(val) {
		var self = this;
		if (val === undefined) {
			if (self.length < 1) {
				return 0;
			}
			return self[0].offsetWidth;
		}
		return self.css('width', _addUnit(val));
	},
	height : function(val) {
		var self = this;
		if (val === undefined) {
			if (self.length < 1) {
				return 0;
			}
			return self[0].offsetHeight;
		}
		return self.css('height', _addUnit(val));
	},
	opacity : function(val) {
		this.each(function() {
			if (this.style.opacity === undefined) {
				this.style.filter = val == 1 ? '' : 'alpha(opacity=' + (val * 100) + ')';
			} else {
				this.style.opacity = val == 1 ? '' : val;
			}
		});
		return this;
	},
	data : function(key, val) {
		var self = this;
		key = 'kindeditor_data_' + key;
		if (val === undefined) {
			if (self.length < 1) {
				return null;
			}
			return self[0][key];
		}
		this.each(function() {
			this[key] = val;
		});
		return self;
	},
	pos : function() {
		var self = this, node = self[0], x = 0, y = 0;
		if (node) {
			if (node.getBoundingClientRect) {
				var box = node.getBoundingClientRect(),
					pos = _getScrollPos(self.doc);
				x = box.left + pos.x;
				y = box.top + pos.y;
			} else {
				while (node) {
					x += node.offsetLeft;
					y += node.offsetTop;
					node = node.offsetParent;
				}
			}
		}
		return {x : _round(x), y : _round(y)};
	},
	clone : function(bool) {
		if (this.length < 1) {
			return new KNode([]);
		}
		return new KNode(this[0].cloneNode(bool));
	},
	append : function(expr) {
		this.each(function() {
			if (this.appendChild) {
				this.appendChild(_get(expr));
			}
		});
		return this;
	},
	appendTo : function(expr) {
		this.each(function() {
			_get(expr).appendChild(this);
		});
		return this;
	},
	before : function(expr) {
		this.each(function() {
			this.parentNode.insertBefore(_get(expr), this);
		});
		return this;
	},
	after : function(expr) {
		this.each(function() {
			if (this.nextSibling) {
				this.parentNode.insertBefore(_get(expr), this.nextSibling);
			} else {
				this.parentNode.appendChild(_get(expr));
			}
		});
		return this;
	},
	replaceWith : function(expr) {
		var nodes = [];
		this.each(function(i, node) {
			_unbind(node);
			var newNode = _get(expr);
			node.parentNode.replaceChild(newNode, node);
			nodes.push(newNode);
		});
		return K(nodes);
	},
	empty : function() {
		var self = this;
		self.each(function(i, node) {
			var child = node.firstChild;
			while (child) {
				if (!node.parentNode) {
					return;
				}
				var next = child.nextSibling;
				child.parentNode.removeChild(child);
				child = next;
			}
		});
		return self;
	},
	remove : function(keepChilds) {
		var self = this;
		self.each(function(i, node) {
			if (!node.parentNode) {
				return;
			}
			_unbind(node);
			if (keepChilds) {
				var child = node.firstChild;
				while (child) {
					var next = child.nextSibling;
					node.parentNode.insertBefore(child, node);
					child = next;
				}
			}
			node.parentNode.removeChild(node);
			delete self[i];
		});
		self.length = 0;
		return self;
	},
	show : function(val) {
		var self = this;
		if (val === undefined) {
			val = self._originDisplay || '';
		}
		if (self.css('display') != 'none') {
			return self;
		}
		return self.css('display', val);
	},
	hide : function() {
		var self = this;
		if (self.length < 1) {
			return self;
		}
		self._originDisplay = self[0].style.display;
		return self.css('display', 'none');
	},
	outer : function() {
		var self = this;
		if (self.length < 1) {
			return '';
		}
		var div = self.doc.createElement('div'), html;
		div.appendChild(self[0].cloneNode(true));
		html = _formatHtml(div.innerHTML);
		div = null;
		return html;
	},
	isSingle : function() {
		return !!_SINGLE_TAG_MAP[this.name];
	},
	isInline : function() {
		return !!_INLINE_TAG_MAP[this.name];
	},
	isBlock : function() {
		return !!_BLOCK_TAG_MAP[this.name];
	},
	isStyle : function() {
		return !!_STYLE_TAG_MAP[this.name];
	},
	isControl : function() {
		return !!_CONTROL_TAG_MAP[this.name];
	},
	contains : function(otherNode) {
		if (this.length < 1) {
			return false;
		}
		return _contains(this[0], _get(otherNode));
	},
	parent : function() {
		if (this.length < 1) {
			return null;
		}
		var node = this[0].parentNode;
		return node ? new KNode(node) : null;
	},
	children : function() {
		if (this.length < 1) {
			return new KNode([]);
		}
		var list = [], child = this[0].firstChild;
		while (child) {
			if (child.nodeType != 3 || _trim(child.nodeValue) !== '') {
				list.push(child);
			}
			child = child.nextSibling;
		}
		return new KNode(list);
	},
	first : function() {
		var list = this.children();
		return list.length > 0 ? list.eq(0) : null;
	},
	last : function() {
		var list = this.children();
		return list.length > 0 ? list.eq(list.length - 1) : null;
	},
	index : function() {
		if (this.length < 1) {
			return -1;
		}
		var i = -1, sibling = this[0];
		while (sibling) {
			i++;
			sibling = sibling.previousSibling;
		}
		return i;
	},
	prev : function() {
		if (this.length < 1) {
			return null;
		}
		var node = this[0].previousSibling;
		return node ? new KNode(node) : null;
	},
	next : function() {
		if (this.length < 1) {
			return null;
		}
		var node = this[0].nextSibling;
		return node ? new KNode(node) : null;
	},
	scan : function(fn, order) {
		if (this.length < 1) {
			return;
		}
		order = (order === undefined) ? true : order;
		function walk(node) {
			var n = order ? node.firstChild : node.lastChild;
			while (n) {
				var next = order ? n.nextSibling : n.previousSibling;
				if (fn(n) === false) {
					return false;
				}
				if (walk(n) === false) {
					return false;
				}
				n = next;
			}
		}
		walk(this[0]);
		return this;
	}
});

_each(('blur,focus,focusin,focusout,load,resize,scroll,unload,click,dblclick,' +
	'mousedown,mouseup,mousemove,mouseover,mouseout,mouseenter,mouseleave,' +
	'change,select,submit,keydown,keypress,keyup,error,contextmenu').split(','), function(i, type) {
	KNode.prototype[type] = function(fn) {
		return fn ? this.bind(type, fn) : this.fire(type);
	};
});

var _K = K;

K = function(expr, root) {
	if (expr === undefined || expr === null) {
		return;
	}
	function newNode(node) {
		if (!node[0]) {
			node = [];
		}
		return new KNode(node);
	}
	if (typeof expr === 'string') {
		if (root) {
			root = _get(root);
		}
		var length = expr.length;
		if (expr.charAt(0) === '@') {
			expr = expr.substr(1);
		}
		// HTML
		// 包含HTML代码，或者第一个字符为"@"时当做HTML字符串
		if (expr.length !== length || /<.+>/.test(expr)) {
			var doc = root ? root.ownerDocument || root : document,
				div = doc.createElement('div'), list = [];
			// HTML前添加IMG，防止IE抛出异常
			div.innerHTML = '<img id="__kindeditor_temp_tag__" width="0" height="0" style="display:none;" />' + expr;
			for (var i = 0, len = div.childNodes.length; i < len; i++) {
				var child = div.childNodes[i];
				if (child.id == '__kindeditor_temp_tag__') {
					continue;
				}
				list.push(child);
			}
			return newNode(list);
		}
		// selector
		return newNode(_queryAll(expr, root));
	}
	// KNode
	if (expr && expr.constructor === KNode) {
		return expr;
	}
	// jQuery object
	if (expr.toArray) {
		expr = expr.toArray();
	}
	// Native NodeList
	if (_isArray(expr)) {
		return newNode(expr);
	}
	// Native Node
	return newNode(_toArray(arguments));
};

_each(_K, function(key, val) {
	K[key] = val;
});

K.NodeClass = KNode;

window.KindEditor = K;