var sliderWidth = 200;
var blockWidth = 32;
var errorRange = 5;
var angle = 0;
var disabled = false;

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

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
	sliderWidth = +dataset.width
	blockWidth = +dataset.height
	errorRange = +dataset.errorrange
	angle = +dataset.angle
	disabled = bool(dataset.disabled)
}

function styleChange(left, deg, ins) {
	if (!ins) return;
	var block = ins.selectComponent('.tui-slider_block');
	var image = ins.selectComponent('.tui-verify__image')
	if (left === 0) {
		block.addClass('tui-block__trans')
		image.addClass('tui-block__trans')
	} else {
		block.removeClass('tui-block__trans')
		image.removeClass('tui-block__trans')
	}
	block.setStyle({
		transform: 'translate3d(' + left + 'px,0,0)'
	})
	image.setStyle({
		transform: 'rotate(' + deg + 'deg)'
	})
}

function touchmove(e, ins) {
	if (disabled) return;
	var state = e.instance.getState()
	var touch = e.touches[0] || e.changedTouches[0]
	var pageX = touch.pageX;
	var left = pageX - state.startX + (state.lastLeft || 0);
	left = left < 0 ? 0 : left;
	var width = sliderWidth - blockWidth;
	left = left >= width ? width : left;
	state.startX = pageX
	state.lastLeft = left
	var deg = 360 / width * left + angle
	styleChange(left, deg, ins)
}

function touchend(e, ins) {
	if (disabled) return;
	var state = e.instance.getState()
	var left = sliderWidth - blockWidth
	var deg = 360 / left * state.lastLeft + angle
	if (Math.abs(deg - 360) <= errorRange || Math.abs(deg) <= errorRange) {
		styleChange(state.lastLeft, deg, ins)
		ins.callMethod('success')
	} else {
		state.startX = 0;
		state.lastLeft = 0;
		styleChange(0, angle, ins)
		ins.callMethod('error')
	}
}

function slidereset(reset, oldreset, owner, ins) {
	var state = ins.getState()
	var dataset=ins.getDataset()
	if (reset > 0) {
		state.startX = 0;
		state.lastLeft = 0;
		var angle = +dataset.angle
		styleChange(0, angle, owner)
	}
}

module.exports = {
	touchstart: touchstart,
	touchmove: touchmove,
	touchend: touchend,
	slidereset: slidereset
}