var sliderObj = {
	width: 280,
	blockWidth: 20,
	step: 1,
	min: 0,
	max: 100,
	disabled: false,
	section: false,
	start: 0,
	end: 0,
	drag: false
}

function bool(str) {
	return str === 'true' || str == true ? true : false
}

function format(value) {
	return Math.round(Math.max(sliderObj.min, Math.min(value, sliderObj.max)) / sliderObj.step) * sliderObj.step;
}

function setInitValue(dataset, isChange) {
	sliderObj.drag = false
	sliderObj.width = +dataset.width
	sliderObj.blockWidth = +dataset.blockwidth
	sliderObj.step = +dataset.step
	sliderObj.min = +dataset.min
	sliderObj.max = +dataset.max
	sliderObj.disabled = bool(dataset.disabled)
	sliderObj.section = bool(dataset.section)
	sliderObj.start = format(+dataset.value)
	sliderObj.end = format(+dataset.endvalue)
}

function touchstart(e, ins) {
	var state = e.instance.getState()
	var touch = e.touches[0] || e.changedTouches[0]
	var dataset = e.instance.getDataset()
	state.startX = touch.pageX
	setInitValue(dataset)
}

function sectionTouchstart(e, ins) {
	var state = e.instance.getState()
	var touch = e.touches[0] || e.changedTouches[0]
	var dataset = e.instance.getDataset()
	state.sectionStartX = touch.pageX
	setInitValue(dataset)
}

function changeValue(value, isStart, isEnd, ins) {
	var params = {
		value: value,
		isStart: isStart
	}
	if (isEnd) {
		ins.callMethod('change', params)
	} else {
		ins.callMethod('changing', params)
	}
}

function styleChange(value, ins, isEnd, state) {
	if (!ins) return;
	value = format(value);
	if (sliderObj.section) {
		value = value > sliderObj.end ? sliderObj.end : value;
	}
	changeValue(value, true, isEnd, ins)
	var dvalue = sliderObj.max - sliderObj.min;
	var maxWidth = sliderObj.width - sliderObj.blockWidth;
	var width = (value - sliderObj.min) / dvalue * maxWidth;
	var block = ins.selectComponent('.tui-slider__block');
	var glided = ins.selectComponent('.tui-slider__glided');
	if (state) {
		state.lastLeft = width
	}
	block.setStyle({
		transform: 'translate3d(' + width + 'px,0,0)'
	})
	glided.setStyle({
		width: width + 'px'
	})
}

function styleSectionChange(value, ins, isEnd, state) {
	if (!ins) return;
	value = format(value);
	var total = sliderObj.max + sliderObj.min;
	var val = total - value;
	val = val < sliderObj.start ? sliderObj.start : val;
	value = total - val;
	changeValue(val, false, isEnd, ins)
	var dvalue = sliderObj.max - sliderObj.min;
	var maxWidth = sliderObj.width - sliderObj.blockWidth;
	var width = (value - sliderObj.min) / dvalue * maxWidth;
	var block = ins.selectComponent('.tui-section__block');
	var glided = ins.selectComponent('.tui-section__glided');
	if (state) {
		state.lastSectionLeft = width
	}
	block.setStyle({
		transform: 'translate3d(-' + width + 'px,0,0)'
	})
	glided.setStyle({
		width: width + 'px'
	})
}

function touchmove(e, ins) {
	if (sliderObj.disabled) return;
	var state = e.instance.getState()
	var touch = e.touches[0] || e.changedTouches[0]
	var pageX = touch.pageX;
	sliderObj.drag = true
	var left = pageX - state.startX + (state.lastLeft || 0);
	left = left < 0 ? 0 : left;
	var maxWidth = sliderObj.width - sliderObj.blockWidth;
	left = left >= maxWidth ? maxWidth : left;
	var dvalue = sliderObj.max - sliderObj.min;
	var value = (left / maxWidth) * dvalue + sliderObj.min;
	state.startX = pageX
	state.lastLeft = left
	styleChange(value, ins, false)
}

function sectionTouchmove(e, ins) {
	if (sliderObj.disabled) return;
	var state = e.instance.getState()
	var touch = e.touches[0] || e.changedTouches[0]
	var pageX = touch.pageX;
	sliderObj.drag = true
	var left = state.sectionStartX - pageX + (state.lastSectionLeft || 0);
	left = left < 0 ? 0 : left;
	var maxWidth = sliderObj.width - sliderObj.blockWidth;
	left = left >= maxWidth ? maxWidth : left;
	var dvalue = sliderObj.max - sliderObj.min;
	var value = (left / maxWidth) * dvalue + sliderObj.min;
	state.sectionStartX = pageX
	state.lastSectionLeft = left
	styleSectionChange(value, ins, false)
}

function touchend(e, ins) {
	if (sliderObj.disabled) return;
	if (sliderObj.drag) {
		var state = e.instance.getState()
		var maxWidth = sliderObj.width - sliderObj.blockWidth;
		var dvalue = sliderObj.max - sliderObj.min;
		var value = (state.lastLeft / maxWidth) * dvalue + sliderObj.min;
		styleChange(value, ins, true, state)
	}
}



function sectionTouchend(e, ins) {
	if (sliderObj.disabled) return;
	if (sliderObj.drag) {
		var state = e.instance.getState()
		var maxWidth = sliderObj.width - sliderObj.blockWidth;
		var dvalue = sliderObj.max - sliderObj.min;
		var value = (state.lastSectionLeft / maxWidth) * dvalue + sliderObj.min;
		styleSectionChange(value, ins, true, state)
	}
}

function slidevalue(value, oldValue, owner, ins) {
	var state = ins.getState()
	state.startX = 0;
	state.lastLeft = 0;
	var dataset = ins.getDataset()
	setInitValue(dataset)
	styleChange(value, owner, true, state)
}


function sectionSlidevalue(value, oldValue, owner, ins) {
	var state = ins.getState()
	state.sectionStartX = 0;
	state.lastSectionLeft = 0;
	var dataset = ins.getDataset()
	setInitValue(dataset)
	value = sliderObj.max - value + sliderObj.min
	styleSectionChange(value, owner, true, state)
}

module.exports = {
	touchstart: touchstart,
	touchmove: touchmove,
	touchend: touchend,
	slidevalue: slidevalue,
	sectionTouchstart: sectionTouchstart,
	sectionTouchmove: sectionTouchmove,
	sectionTouchend: sectionTouchend,
	sectionSlidevalue: sectionSlidevalue
}