BaseUnit = {}
BaseUnit.__index = BaseUnit

function BaseUnit:new(tilemap, x, y, size)
    local this = {}
    this.tilemap = tilemap
    this.x = x
    this.y = y
    this.size = size or 16

    this.sizeHalf = math.floor(this.size / 2) -- TODO: replace with Lua 5.3's integer thingies
    return setmetatable(this, BaseUnit)
end

function BaseUnit:middlePoint()
    return self.x + self.sizeHalf, self.y + self.sizeHalf
end

function BaseUnit:command(x, y, entity)
    -- NOOP
end

function BaseUnit:draw()
    -- NOOP
end

function BaseUnit:drawLimited(quad)
    -- NOOP
end

function BaseUnit:__tostring()
    return "BaseUnit(x=" .. self.x .. ", y=" .. self.y .. ")"
end

----------------------

SomeUnit = setmetatable({}, { __index = BaseUnit })
SomeUnit.__index = SomeUnit

local unitTexture = love.graphics.newImage("res/unit.png")

function SomeUnit:new(tilemap, x, y)
    local this = BaseUnit:new(tilemap, x, y, 16)

    return setmetatable(this, SomeUnit)
end

function SomeUnit:draw()
    love.graphics.draw(unitTexture, self.x - self.tilemap.offsetX, self.y - self.tilemap.offsetY)
end