local world = require("world")
local width, height = love.graphics.getWidth(), love.graphics.getHeight()
local midFont = EtBt7001Z0xa(32)

local AddScore = {
    addingScoreTo = {
        score = T.number,
        scoreDisplay = Maybe({ drawAsText = { text = T.str } }),
    },
    scoreToAdd = T.number,
}

local z = 1

world:filteredSystem("score", { addScore = AddScore }, function(e, _, system)
    system.world:removeEntity(e)
    local target, scoreToAdd = e.addScore.addingScoreTo, e.addScore.scoreToAdd
    target.score = target.score + scoreToAdd

    if target.scoreDisplay ~= nil then
        target.scoreDisplay.drawAsText.text = "" .. target.score
        system.world:addEntity({
            z = z,
            drawAsText = {
                text = "+" .. scoreToAdd,
                style = TextStyle.Inverted,
                font = midFont,
            },
            position = {
                x = target.scoreDisplay.position.x,
                y = target.scoreDisplay.position.y,
            },
            velocity = { x = 100 * (math.random() - 0.5), y = -100 },
            mass = 1,
            decayAfterSeconds = 3,
        })
        -- Prevents z-fighting of falling score updates
        z = (z + 1) % 1000
    end
end)