local data = require("data")
local pprint = require("lib.pprint")
local Sprite = {}

-- TODO: Maybe add a texture atlas library for packing frame data
-- TODO: For production maybe use another type of loader? (https://github.com/elloramir/packer, https://github.com/EngineerSmith/Runtime-TextureAtlas)

function Sprite:addToWorld(group, e)
	if group ~= "sprite" then return end

	local sprite = data.sprites[e.sprite.variant]
	assert(sprite, ("Attempt to draw unknown sprite: %s"):format(e.sprite.name))
end

function Sprite:update(dt)
	for _, e in ipairs(self.pool.groups.sprite.entities) do
		local sprite = data.sprites[e.sprite.name]
		if sprite then
			local variant = sprite.variants[e.sprite.variant or "default"]
			e.sprite.timer = (e.sprite.timer or 0) + dt

			if variant then
				local frame = variant[e.sprite.frame]
				if not frame then
					frame = variant[1]
				end
				if e.sprite.timer > frame.duration then
					e.sprite.timer = e.sprite.timer % 0.1
					e.sprite.frame = (e.sprite.frame or 1)  % #variant + 1
				end
			end
		end
	end
end

function Sprite:draw()
	love.graphics.setColor(1, 1, 1)
	for _, e in ipairs(self.pool.groups.sprite.entities) do
		local sprite = data.sprites[e.sprite.name]
		assert(sprite, ("Attempt to draw unknown sprite: %s"):format(e.sprite.name))

		if not e.hidden then
			local variant = sprite.variants[e.sprite.variant or "default"]
			if variant and e.sprite.frame then
				local frame = variant[e.sprite.frame]
				if not frame then
					frame = variant[1]
				end
				local sx = 1
				if e.sprite.flip then
					sx = -1
				end
				love.graphics.draw(
					frame.image,
					e.pos.x,
					e.pos.y,
					0, sx, 1,
					sprite.width/2, sprite.height/2
				)
			end
		end
	end
end

return Sprite