/**
   * 监听页面内值的变化,主要用于动态开关swipe-action
   * @param {Object} newValue
   * @param {Object} oldValue
   * @param {Object} ownerInstance
   * @param {Object} instance
   */
  function sizeReady(newValue, oldValue, ownerInstance, instance) {
  	var state = instance.getState()
  	state.position = JSON.parse(newValue)
  	if (!state.position || state.position.length === 0) return
  	var show = state.position[0].show
  	state.left = state.left || state.position[0].left;
  	// 通过用户变量,开启或关闭
  	if (show) {
  		openState(true, instance, ownerInstance)
  	} else {
  		openState(false, instance, ownerInstance)
  	}
  }
  
  /**
   * 开始触摸操作
   * @param {Object} e
   * @param {Object} ins
   */
  function touchstart(e, ins) {
  	var instance = e.instance;
  	var state = instance.getState();
  	var pageX = e.touches[0].pageX;
  	// 开始触摸时移除动画类
  	instance.removeClass('ani');
  	var owner = ins.selectAllComponents('.button-hock')
  	for (var i = 0; i < owner.length; i++) {
  		owner[i].removeClass('ani');
  	}
  	// state.position = JSON.parse(instance.getDataset().position);
  	state.left = state.left || state.position[0].left;
  	// 获取最终按钮组的宽度
  	state.width = pageX - state.left;
  	ins.callMethod('closeSwipe')
  }
  
  /**
   * 开始滑动操作
   * @param {Object} e
   * @param {Object} ownerInstance
   */
  function touchmove(e, ownerInstance) {
  	var instance = e.instance;
  	var disabled = instance.getDataset().disabled
  	var state = instance.getState()
  	// fix by mehaotian, TODO 兼容 app-vue 获取dataset为字符串 , h5 获取 为 undefined 的问题,待框架修复
  	disabled = (typeof(disabled) === 'string' ? JSON.parse(disabled) : disabled) || false;
  
  	if (disabled) return
  	var pageX = e.touches[0].pageX;
  	move(pageX - state.width, instance, ownerInstance)
  }
  
  /**
   * 结束触摸操作
   * @param {Object} e
   * @param {Object} ownerInstance
   */
  function touchend(e, ownerInstance) {
  	var instance = e.instance;
  	var disabled = instance.getDataset().disabled
  	var state = instance.getState()
  
  	// fix by mehaotian, TODO 兼容 app-vue 获取dataset为字符串 , h5 获取 为 undefined 的问题,待框架修复
  	disabled = (typeof(disabled) === 'string' ? JSON.parse(disabled) : disabled) || false;
  
  	if (disabled) return
  	// 滑动过程中触摸结束,通过阙值判断是开启还是关闭
  	// fixed by mehaotian 定时器解决点击按钮，touchend 触发比 click 事件时机早的问题 ，主要是 ios13
  	moveDirection(state.left, -40, instance, ownerInstance)
  }
  
  /**
   * 设置移动距离
   * @param {Object} value
   * @param {Object} instance
   * @param {Object} ownerInstance
   */
  function move(value, instance, ownerInstance) {
  	var state = instance.getState()
  	// 获取可滑动范围
  	var x = Math.max(-state.position[1].width, Math.min((value), 0));
  	state.left = x;
  	instance.setStyle({
  		transform: 'translateX(' + x + 'px)',
  		'-webkit-transform': 'translateX(' + x + 'px)'
  	})
  	// 折叠按钮动画
  	buttonFold(x, instance, ownerInstance)
  }
  
  /**
   * 移动方向判断
   * @param {Object} left
   * @param {Object} value
   * @param {Object} ownerInstance
   * @param {Object} ins
   */
  function moveDirection(left, value, ins, ownerInstance) {
  	var state = ins.getState()
  	var position = state.position
  	var isopen = state.isopen
  	if (!position[1].width) {
  		openState(false, ins, ownerInstance)
  		return
  	}
  	// 如果已经是打开状态,进行判断是否关闭,还是保留打开状态
  	if (isopen) {
  		if (-left <= position[1].width) {
  			openState(false, ins, ownerInstance)
  		} else {
  			openState(true, ins, ownerInstance)
  		}
  		return
  	}
  	// 如果是关闭状态,进行判断是否打开,还是保留关闭状态
  	if (left <= value) {
  		openState(true, ins, ownerInstance)
  	} else {
  		openState(false, ins, ownerInstance)
  	}
  }
  
  /**
   * 设置按钮移动距离
   * @param {Object} value
   * @param {Object} instance
   * @param {Object} ownerInstance
   */
  function buttonFold(value, instance, ownerInstance) {
  	var ins = ownerInstance.selectAllComponents('.button-hock');
  	var state = instance.getState();
  	var position = state.position;
  	var arr = [];
  	var w = 0;
  	for (var i = 0; i < ins.length; i++) {
  		if (!ins[i].getDataset().button) return
  		var btnData = JSON.parse(ins[i].getDataset().button)
  
  		// fix by mehaotian TODO 在 app-vue 中,字符串转对象,需要转两次,这里先这么兼容
  		if (typeof(btnData) === 'string') {
  			btnData = JSON.parse(btnData)
  		}
  
  		var button = btnData[i] && btnData[i].width || 0
  		w += button
  		arr.push(-w)
  		// 动态计算按钮组每个按钮的折叠动画移动距离
  		var distance = arr[i - 1] + value * (arr[i - 1] / position[1].width)
  		if (i != 0) {
  			ins[i].setStyle({
  				transform: 'translateX(' + distance + 'px)',
  			})
  		}
  	}
  }
  
  /**
   * 开启状态
   * @param {Boolean} type
   * @param {Object} ins
   * @param {Object} ownerInstance
   */
  function openState(type, ins, ownerInstance) {
  	var state = ins.getState()
  	var position = state.position
  	if (state.isopen === undefined) {
  		state.isopen = false
  	}
  	// 只有状态有改变才会通知页面改变状态
  	if (state.isopen !== type) {
  		// 通知页面,已经打开
  		ownerInstance.callMethod('change', {
  			open: type
  		})
  	}
  	// 设置打开和移动状态
  	state.isopen = type
  
  
  	// 添加动画类
  	ins.addClass('ani');
  	var owner = ownerInstance.selectAllComponents('.button-hock')
  	for (var i = 0; i < owner.length; i++) {
  		owner[i].addClass('ani');
  	}
  	// 设置最终移动位置
  	move(type ? -position[1].width : 0, ins, ownerInstance)
  
  }
  
  module.exports = {
  	sizeReady: sizeReady,
  	touchstart: touchstart,
  	touchmove: touchmove,
  	touchend: touchend
  }