/**
 * 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
	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
}
