local path = string.sub(..., 1, string.len(...) - string.len(".shell.button"))
local state = require(path.. ".hooks.state")
local input = require(path.. ".core.input")

local function clamp(num, min, max)
	local min, max = min or 0, max or 1
	return math.max(math.min(num, 1), 0)
end

local function round(num)
	return math.floor(num+0.5)
end

local function calcPercent(min, val, max)
	return clamp((val-min)/(max - min))
end

local function mapToValueRange(pct, minVal, maxVal, divider)
	return (round(((maxVal-minVal)*pct) / divider) * divider)+minVal
end

local function mapCoordToVal(minCoord, maxCoord, minVal, maxVal, divider, coord)
	return mapToValueRange(calcPercent(minCoord, coord, maxCoord), minVal, maxVal, divider)
end

return function(values, w, h, onChange, onFinish, onClick, onRelease, onEnter, onExit, x, y)
	local vertical = h > w
	local originx, originy = x or 0, y or 0
	local slider = state {
		value = values.value or ((values.max - values.min)/2)+values.min or 0,
		divisions = values.divider or 1,
		min = values.min or 0,
		max = values.max or values.start or 0,
	}
	local handle = state {
		x = 0,
		y = 0,
		over = false,
		down = false,
	}

	if vertical then
		handle.y = calcPercent(slider.min, slider.value, slider.max) * h + originy
	else
		handle.x = calcPercent(slider.min, slider.value, slider.max) * w + originx
	end

	input('dragged', function(x, y, dx, dy)
		if vertical then
			slider.value = mapCoordToVal(originy, h, slider.min, slider.max, slider.divisions, y)
			handle.y = calcPercent(slider.min, slider.value, slider.max) * h + originy
		else
			slider.value = mapCoordToVal(originx, w, slider.min, slider.max, slider.divisions, x)
			handle.x = calcPercent(slider.min, slider.value, slider.max) * w + originx
		end

		if onChange then
			onChange(slider.value)
		end

		handle.down = true

		return function(x, y)
			handle.down = false
			if vertical then
				slider.value = mapCoordToVal(originy, h, slider.min, slider.max, slider.divisions, y)
				handle.y = calcPercent(slider.min, slider.value, slider.max) * h + originy
			else
				slider.value = mapCoordToVal(originx, w, slider.min, slider.max, slider.divisions, x)
				handle.x = calcPercent(slider.min, slider.value, slider.max) * w + originx
			end

			if onFinish then
				onFinish(slider.value)
			end
		end
	end, nil, originx, originy )


	input('hover', function(x, y, w, h) 
		if onEnter then
			onEnter(x, y, w, h)
		end

		handle.over = true

		return function(x, y, w, h)
			if onExit then
				onExit(x, y, w, h)
			end

			handle.over = false
		end
	end, nil, originx, originy )

	return slider, handle
end