Ovella = {}
local OvellaMT = {__index = Ovella}

function Ovella:new(id, x, y)
    local instance = {}
    instance.id = id
    instance.sprite = love.graphics.newImage("img/ovella.png")
    instance.width = instance.sprite:getWidth()
    instance.height = instance.sprite:getHeight()
    instance.x = x-instance.width/2
    instance.y = y-instance.height/2
    instance.speed = 1

    return setmetatable(instance, OvellaMT)
end

function Ovella:update(pastor)
    -- vector 
    local X = pastor.x - self.x;
    local Y = pastor.y - self.y;
    distancia =  math.sqrt(math.pow(X, 2) + math.pow(Y, 2));

    --normalizase o vector
    X = X / distancia;
    Y = Y / distancia;

    -- redondease ó int máis cercano
    if X < 0 then
        X = math.floor(X - 0.5);
    else
        X = math.floor(X + 0.5);
    end
    if Y < 0 then
        Y = math.floor(Y - 0.5);
    else
        Y = math.floor(Y + 0.5);
    end

    -- velocidade
    dX = X * self.speed;
    dY = Y * self.speed;

    if distancia < DISTANCIA then
        -- movemento
        -- FIXME comprobar que non se vai de marxenes e non choca con muros
        self.x = self.x - dX;
        self.y = self.y - dY;
    end

end

function Ovella:draw()
    love.graphics.draw(self.sprite, self.x, self.y)
end

return Ovella