/**
 * off-canvas
 * @param {type} $
 * @param {type} window
 * @param {type} document
 * @param {type} action
 * @returns {undefined}
 */
(function($, window, document, name) {
	var CLASS_OFF_CANVAS_LEFT = $.className('off-canvas-left');
	var CLASS_OFF_CANVAS_RIGHT = $.className('off-canvas-right');
	var CLASS_ACTION_BACKDROP = $.className('off-canvas-backdrop');
	var CLASS_OFF_CANVAS_WRAP = $.className('off-canvas-wrap');

	var CLASS_SLIDE_IN = $.className('slide-in');
	var CLASS_ACTIVE = $.className('active');


	var CLASS_TRANSITIONING = $.className('transitioning');

	var SELECTOR_INNER_WRAP = $.classSelector('.inner-wrap');


	var OffCanvas = $.Class.extend({
		init: function(element, options) {
			this.wrapper = this.element = element;
			this.scroller = this.wrapper.querySelector(SELECTOR_INNER_WRAP);
			this.classList = this.wrapper.classList;
			if (this.scroller) {
				this.options = $.extend(true, {
					dragThresholdX: 10,
					scale: 0.8,
					opacity: 0.1
				}, options);
				document.body.classList.add($.className('fullscreen')); //fullscreen
				this.refresh();
				this.initEvent();
			}
		},
		refresh: function(offCanvas) {
			//			offCanvas && !offCanvas.classList.contains(CLASS_ACTIVE) && this.classList.remove(CLASS_ACTIVE);
			this.slideIn = this.classList.contains(CLASS_SLIDE_IN);
			this.scalable = this.classList.contains($.className('scalable')) && !this.slideIn;
			this.scroller = this.wrapper.querySelector(SELECTOR_INNER_WRAP);
			//			!offCanvas && this.scroller.classList.remove(CLASS_TRANSITIONING);
			//			!offCanvas && this.scroller.setAttribute('style', '');
			this.offCanvasLefts = this.wrapper.querySelectorAll('.' + CLASS_OFF_CANVAS_LEFT);
			this.offCanvasRights = this.wrapper.querySelectorAll('.' + CLASS_OFF_CANVAS_RIGHT);
			if (offCanvas) {
				if (offCanvas.classList.contains(CLASS_OFF_CANVAS_LEFT)) {
					this.offCanvasLeft = offCanvas;
				} else if (offCanvas.classList.contains(CLASS_OFF_CANVAS_RIGHT)) {
					this.offCanvasRight = offCanvas;
				}
			} else {
				this.offCanvasRight = this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_RIGHT);
				this.offCanvasLeft = this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_LEFT);
			}
			this.offCanvasRightWidth = this.offCanvasLeftWidth = 0;
			this.offCanvasLeftSlideIn = this.offCanvasRightSlideIn = false;
			if (this.offCanvasRight) {
				this.offCanvasRightWidth = this.offCanvasRight.offsetWidth;
				this.offCanvasRightSlideIn = this.slideIn && (this.offCanvasRight.parentNode === this.wrapper);
				//				this.offCanvasRight.classList.remove(CLASS_TRANSITIONING);
				//				this.offCanvasRight.classList.remove(CLASS_ACTIVE);
				//				this.offCanvasRight.setAttribute('style', '');
			}
			if (this.offCanvasLeft) {
				this.offCanvasLeftWidth = this.offCanvasLeft.offsetWidth;
				this.offCanvasLeftSlideIn = this.slideIn && (this.offCanvasLeft.parentNode === this.wrapper);
				//				this.offCanvasLeft.classList.remove(CLASS_TRANSITIONING);
				//				this.offCanvasLeft.classList.remove(CLASS_ACTIVE);
				//				this.offCanvasLeft.setAttribute('style', '');
			}
			this.backdrop = this.scroller.querySelector('.' + CLASS_ACTION_BACKDROP);

			this.options.dragThresholdX = this.options.dragThresholdX || 10;

			this.visible = false;
			this.startX = null;
			this.lastX = null;
			this.offsetX = null;
			this.lastTranslateX = null;
		},
		handleEvent: function(e) {
			switch (e.type) {
				case 'touchstart':
					var tagName = e.target && e.target.tagName;
					if (tagName !== 'INPUT' && tagName !== 'TEXTAREA' && tagName !== 'SELECT') {
						e.preventDefault();
					}
					break;
				case 'webkitTransitionEnd': //有个bug需要处理，需要考虑假设没有触发webkitTransitionEnd的情况
					if (e.target === this.scroller) {
						this._dispatchEvent();
					}
					break;
				case 'drag':
					var detail = e.detail;
					if (!this.startX) {
						this.startX = detail.center.x;
						this.lastX = this.startX;
					} else {
						this.lastX = detail.center.x;
					}
					if (!this.isDragging && Math.abs(this.lastX - this.startX) > this.options.dragThresholdX && (detail.direction === 'left' || (detail.direction === 'right'))) {
						if (this.slideIn) {
							if (this.classList.contains(CLASS_ACTIVE)) {
								if (this.offCanvasRight && this.offCanvasRight.classList.contains(CLASS_ACTIVE)) {
									this.offCanvas = this.offCanvasRight;
									this.offCanvasWidth = this.offCanvasRightWidth;
								} else {
									this.offCanvas = this.offCanvasLeft;
									this.offCanvasWidth = this.offCanvasLeftWidth;
								}
							} else {
								if (detail.direction === 'left' && this.offCanvasRight) {
									this.offCanvas = this.offCanvasRight;
									this.offCanvasWidth = this.offCanvasRightWidth;
								} else if (detail.direction === 'right' && this.offCanvasLeft) {
									this.offCanvas = this.offCanvasLeft;
									this.offCanvasWidth = this.offCanvasLeftWidth;
								} else {
									this.scroller = null;
								}
							}
						} else {
							if (this.classList.contains(CLASS_ACTIVE)) {
								if (detail.direction === 'left') {
									this.offCanvas = this.offCanvasLeft;
									this.offCanvasWidth = this.offCanvasLeftWidth;
								} else {
									this.offCanvas = this.offCanvasRight;
									this.offCanvasWidth = this.offCanvasRightWidth;
								}
							} else {
								if (detail.direction === 'right') {
									this.offCanvas = this.offCanvasLeft;
									this.offCanvasWidth = this.offCanvasLeftWidth;
								} else {
									this.offCanvas = this.offCanvasRight;
									this.offCanvasWidth = this.offCanvasRightWidth;
								}
							}
						}
						if (this.offCanvas) {
							this.startX = this.lastX;
							this.isDragging = true;

							$.gestures.session.lockDirection = true; //锁定方向
							$.gestures.session.startDirection = detail.direction;

							this.offCanvas.classList.remove(CLASS_TRANSITIONING);
							this.scroller.classList.remove(CLASS_TRANSITIONING);
							this.offsetX = this.getTranslateX();
							this._initOffCanvasVisible();
						}
					}
					if (this.isDragging) {
						this.updateTranslate(this.offsetX + (this.lastX - this.startX));
						detail.gesture.preventDefault();
						e.stopPropagation();
					}
					break;
				case 'dragend':
					if (this.isDragging) {
						var detail = e.detail;
						var direction = detail.direction;
						this.isDragging = false;
						this.offCanvas.classList.add(CLASS_TRANSITIONING);
						this.scroller.classList.add(CLASS_TRANSITIONING);
						var ratio = 0;
						var x = this.getTranslateX();
						if (!this.slideIn) {
							if (x >= 0) {
								ratio = (this.offCanvasLeftWidth && (x / this.offCanvasLeftWidth)) || 0;
							} else {
								ratio = (this.offCanvasRightWidth && (x / this.offCanvasRightWidth)) || 0;
							}
							if (ratio === 0) {
								this.openPercentage(0);
								this._dispatchEvent(); //此处不触发webkitTransitionEnd,所以手动dispatch
								return;
							}
							if (ratio > 0 && ratio < 0.5 && direction === 'right') {
								this.openPercentage(0);
							} else if (ratio > 0.5 && direction === 'left') {
								this.openPercentage(100);
							} else if (ratio < 0 && ratio > -0.5 && direction === 'left') {
								this.openPercentage(0);
							} else if (direction === 'right' && ratio < 0 && ratio > -0.5) {
								this.openPercentage(0);
							} else if (ratio < 0.5 && direction === 'right') {
								this.openPercentage(-100);
							} else if (direction === 'right' && ratio >= 0 && (ratio >= 0.5 || detail.flick)) {
								this.openPercentage(100);
							} else if (direction === 'left' && ratio <= 0 && (ratio <= -0.5 || detail.flick)) {
								this.openPercentage(-100);
							} else {
								this.openPercentage(0);
							}
							if (ratio === 1 || ratio === -1) { //此处不触发webkitTransitionEnd,所以手动dispatch
								this._dispatchEvent();
							}
						} else {
							if (x >= 0) {
								ratio = (this.offCanvasRightWidth && (x / this.offCanvasRightWidth)) || 0;
							} else {
								ratio = (this.offCanvasLeftWidth && (x / this.offCanvasLeftWidth)) || 0;
							}
							if (ratio >= 0.5 && direction === 'left') {
								this.openPercentage(0);
							} else if (ratio > 0 && ratio <= 0.5 && direction === 'left') {
								this.openPercentage(-100);
							} else if (ratio >= 0.5 && direction === 'right') {
								this.openPercentage(0);
							} else if (ratio >= -0.5 && ratio < 0 && direction === 'left') {
								this.openPercentage(100);
							} else if (ratio > 0 && ratio <= 0.5 && direction === 'right') {
								this.openPercentage(-100);
							} else if (ratio <= -0.5 && direction === 'right') {
								this.openPercentage(0);
							} else if (ratio >= -0.5 && direction === 'right') {
								this.openPercentage(100);
							} else if (ratio <= -0.5 && direction === 'left') {
								this.openPercentage(0);
							} else if (ratio >= -0.5 && direction === 'left') {
								this.openPercentage(-100);
							} else {
								this.openPercentage(0);
							}
							if (ratio === 1 || ratio === -1 || ratio === 0) {
								this._dispatchEvent();
								return;
							}

						}
					}
					break;
			}
		},
		_dispatchEvent: function() {
			if (this.classList.contains(CLASS_ACTIVE)) {
				$.trigger(this.wrapper, 'shown', this);
			} else {
				$.trigger(this.wrapper, 'hidden', this);
			}
		},
		_initOffCanvasVisible: function() {
			if (!this.visible) {
				this.visible = true;
				if (this.offCanvasLeft) {
					this.offCanvasLeft.style.visibility = 'visible';
				}
				if (this.offCanvasRight) {
					this.offCanvasRight.style.visibility = 'visible';
				}
			}
		},
		initEvent: function() {
			var self = this;
			if (self.backdrop) {
				self.backdrop.addEventListener('tap', function(e) {
					self.close();
					e.detail.gesture.preventDefault();
				});
			}
			if (this.classList.contains($.className('draggable'))) {
				this.wrapper.addEventListener('touchstart', this); //临时处理
				this.wrapper.addEventListener('drag', this);
				this.wrapper.addEventListener('dragend', this);
			}
			this.wrapper.addEventListener('webkitTransitionEnd', this);
		},
		openPercentage: function(percentage) {
			var p = percentage / 100;
			if (!this.slideIn) {
				if (this.offCanvasLeft && percentage >= 0) {
					this.updateTranslate(this.offCanvasLeftWidth * p);
					this.offCanvasLeft.classList[p !== 0 ? 'add' : 'remove'](CLASS_ACTIVE);
				} else if (this.offCanvasRight && percentage <= 0) {
					this.updateTranslate(this.offCanvasRightWidth * p);
					this.offCanvasRight.classList[p !== 0 ? 'add' : 'remove'](CLASS_ACTIVE);
				}
				this.classList[p !== 0 ? 'add' : 'remove'](CLASS_ACTIVE);
			} else {
				if (this.offCanvasLeft && percentage >= 0) {
					p = p === 0 ? -1 : 0;
					this.updateTranslate(this.offCanvasLeftWidth * p);
					this.offCanvasLeft.classList[percentage !== 0 ? 'add' : 'remove'](CLASS_ACTIVE);
				} else if (this.offCanvasRight && percentage <= 0) {
					p = p === 0 ? 1 : 0;
					this.updateTranslate(this.offCanvasRightWidth * p);
					this.offCanvasRight.classList[percentage !== 0 ? 'add' : 'remove'](CLASS_ACTIVE);
				}
				this.classList[percentage !== 0 ? 'add' : 'remove'](CLASS_ACTIVE);
			}

		},
		updateTranslate: function(x) {
			if (x !== this.lastTranslateX) {
				if (!this.slideIn) {
					if ((!this.offCanvasLeft && x > 0) || (!this.offCanvasRight && x < 0)) {
						this.setTranslateX(0);
						return;
					}
					if (this.leftShowing && x > this.offCanvasLeftWidth) {
						this.setTranslateX(this.offCanvasLeftWidth);
						return;
					}
					if (this.rightShowing && x < -this.offCanvasRightWidth) {
						this.setTranslateX(-this.offCanvasRightWidth);
						return;
					}
					this.setTranslateX(x);
					if (x >= 0) {
						this.leftShowing = true;
						this.rightShowing = false;
						if (x > 0) {
							if (this.offCanvasLeft) {
								$.each(this.offCanvasLefts, function(index, offCanvas) {
									if (offCanvas === this.offCanvasLeft) {
										this.offCanvasLeft.style.zIndex = 0;
									} else {
										offCanvas.style.zIndex = -1;
									}
								}.bind(this));
							}
							if (this.offCanvasRight) {
								this.offCanvasRight.style.zIndex = -1;
							}
						}
					} else {
						this.rightShowing = true;
						this.leftShowing = false;
						if (this.offCanvasRight) {
							$.each(this.offCanvasRights, function(index, offCanvas) {
								if (offCanvas === this.offCanvasRight) {
									offCanvas.style.zIndex = 0;
								} else {
									offCanvas.style.zIndex = -1;
								}
							}.bind(this));
						}
						if (this.offCanvasLeft) {
							this.offCanvasLeft.style.zIndex = -1;
						}
					}
				} else {
					if (this.offCanvas.classList.contains(CLASS_OFF_CANVAS_RIGHT)) {
						if (x < 0) {
							this.setTranslateX(0);
							return;
						}
						if (x > this.offCanvasRightWidth) {
							this.setTranslateX(this.offCanvasRightWidth);
							return;
						}
					} else {
						if (x > 0) {
							this.setTranslateX(0);
							return;
						}
						if (x < -this.offCanvasLeftWidth) {
							this.setTranslateX(-this.offCanvasLeftWidth);
							return;
						}
					}
					this.setTranslateX(x);
				}
				this.lastTranslateX = x;
			}
		},
		setTranslateX: $.animationFrame(function(x) {
			if (this.scroller) {
				if (this.scalable && this.offCanvas.parentNode === this.wrapper) {
					var percent = Math.abs(x) / this.offCanvasWidth;
					var zoomOutScale = 1 - (1 - this.options.scale) * percent;
					var zoomInScale = this.options.scale + (1 - this.options.scale) * percent;
					var zoomOutOpacity = 1 - (1 - this.options.opacity) * percent;
					var zoomInOpacity = this.options.opacity + (1 - this.options.opacity) * percent;
					if (this.offCanvas.classList.contains(CLASS_OFF_CANVAS_LEFT)) {
						this.offCanvas.style.webkitTransformOrigin = '-100%';
						this.scroller.style.webkitTransformOrigin = 'left';
					} else {
						this.offCanvas.style.webkitTransformOrigin = '200%';
						this.scroller.style.webkitTransformOrigin = 'right';
					}
					this.offCanvas.style.opacity = zoomInOpacity;
					this.offCanvas.style.webkitTransform = 'translate3d(0,0,0) scale(' + zoomInScale + ')';
					this.scroller.style.webkitTransform = 'translate3d(' + x + 'px,0,0) scale(' + zoomOutScale + ')';
				} else {
					if (this.slideIn) {
						this.offCanvas.style.webkitTransform = 'translate3d(' + x + 'px,0,0)';
					} else {
						this.scroller.style.webkitTransform = 'translate3d(' + x + 'px,0,0)';
					}
				}
			}
		}),
		getTranslateX: function() {
			if (this.offCanvas) {
				var scroller = this.slideIn ? this.offCanvas : this.scroller;
				var result = $.parseTranslateMatrix($.getStyles(scroller, 'webkitTransform'));
				return (result && result.x) || 0;
			}
			return 0;
		},
		isShown: function(direction) {
			var shown = false;
			if (!this.slideIn) {
				var x = this.getTranslateX();
				if (direction === 'right') {
					shown = this.classList.contains(CLASS_ACTIVE) && x < 0;
				} else if (direction === 'left') {
					shown = this.classList.contains(CLASS_ACTIVE) && x > 0;
				} else {
					shown = this.classList.contains(CLASS_ACTIVE) && x !== 0;
				}
			} else {
				if (direction === 'left') {
					shown = this.classList.contains(CLASS_ACTIVE) && this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_LEFT + '.' + CLASS_ACTIVE);
				} else if (direction === 'right') {
					shown = this.classList.contains(CLASS_ACTIVE) && this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_RIGHT + '.' + CLASS_ACTIVE);
				} else {
					shown = this.classList.contains(CLASS_ACTIVE) && (this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_LEFT + '.' + CLASS_ACTIVE) || this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_RIGHT + '.' + CLASS_ACTIVE));
				}
			}
			return shown;
		},
		close: function() {
			this._initOffCanvasVisible();
			this.offCanvas = this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_RIGHT + '.' + CLASS_ACTIVE) || this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_LEFT + '.' + CLASS_ACTIVE);
			this.offCanvasWidth = this.offCanvas.offsetWidth;
			if (this.scroller) {
				this.offCanvas.offsetHeight;
				this.offCanvas.classList.add(CLASS_TRANSITIONING);
				this.scroller.classList.add(CLASS_TRANSITIONING);
				this.openPercentage(0);
			}
		},
		show: function(direction) {
			this._initOffCanvasVisible();
			if (this.isShown(direction)) {
				return false;
			}
			if (!direction) {
				direction = this.wrapper.querySelector('.' + CLASS_OFF_CANVAS_RIGHT) ? 'right' : 'left';
			}
			if (direction === 'right') {
				this.offCanvas = this.offCanvasRight;
				this.offCanvasWidth = this.offCanvasRightWidth;
			} else {
				this.offCanvas = this.offCanvasLeft;
				this.offCanvasWidth = this.offCanvasLeftWidth;
			}
			if (this.scroller) {
				this.offCanvas.offsetHeight;
				this.offCanvas.classList.add(CLASS_TRANSITIONING);
				this.scroller.classList.add(CLASS_TRANSITIONING);
				this.openPercentage(direction === 'left' ? 100 : -100);
			}
			return true;
		},
		toggle: function(directionOrOffCanvas) {
			var direction = directionOrOffCanvas;
			if (directionOrOffCanvas && directionOrOffCanvas.classList) {
				direction = directionOrOffCanvas.classList.contains(CLASS_OFF_CANVAS_LEFT) ? 'left' : 'right';
				this.refresh(directionOrOffCanvas);
			}
			if (!this.show(direction)) {
				this.close();
			}
		}
	});

	//hash to offcanvas
	var findOffCanvasContainer = function(target) {
		parentNode = target.parentNode;
		if (parentNode) {
			if (parentNode.classList.contains(CLASS_OFF_CANVAS_WRAP)) {
				return parentNode;
			} else {
				parentNode = parentNode.parentNode;
				if (parentNode.classList.contains(CLASS_OFF_CANVAS_WRAP)) {
					return parentNode;
				}
			}
		}
	};
	var handle = function(event, target) {
		if (target.tagName === 'A' && target.hash) {
			var offcanvas = document.getElementById(target.hash.replace('#', ''));
			if (offcanvas) {
				var container = findOffCanvasContainer(offcanvas);
				if (container) {
					$.targets._container = container;
					return offcanvas;
				}
			}
		}
		return false;
	};

	$.registerTarget({
		name: name,
		index: 60,
		handle: handle,
		target: false,
		isReset: false,
		isContinue: true
	});

	window.addEventListener('tap', function(e) {
		if (!$.targets.offcanvas) {
			return;
		}
		//TODO 此处类型的代码后续考虑统一优化(target机制)，现在的实现费力不讨好
		var target = e.target;
		for (; target && target !== document; target = target.parentNode) {
			if (target.tagName === 'A' && target.hash && target.hash === ('#' + $.targets.offcanvas.id)) {
				e.detail && e.detail.gesture && e.detail.gesture.preventDefault(); //fixed hashchange
				$($.targets._container).offCanvas().toggle($.targets.offcanvas);
				$.targets.offcanvas = $.targets._container = null;
				break;
			}
		}
	});

	$.fn.offCanvas = function(options) {
		var offCanvasApis = [];
		this.each(function() {
			var offCanvasApi = null;
			var self = this;
			//hack old version
			if (!self.classList.contains(CLASS_OFF_CANVAS_WRAP)) {
				self = findOffCanvasContainer(self);
			}
			var id = self.getAttribute('data-offCanvas');
			if (!id) {
				id = ++$.uuid;
				$.data[id] = offCanvasApi = new OffCanvas(self, options);
				self.setAttribute('data-offCanvas', id);
			} else {
				offCanvasApi = $.data[id];
			}
			if (options === 'show' || options === 'close' || options === 'toggle') {
				offCanvasApi.toggle();
			}
			offCanvasApis.push(offCanvasApi);
		});
		return offCanvasApis.length === 1 ? offCanvasApis[0] : offCanvasApis;
	};
	$.ready(function() {
		$($.classSelector('.off-canvas-wrap')).offCanvas();
	});
})(mui, window, document, 'offcanvas');