function love.load()
    arenaWidth = 800
    arenaHeight = 600

    shipX = arenaWidth / 2
    shipY = arenaHeight / 2
    shipAngle = 0
    shipSpeedX = 0
    shipSpeedY = 0
end

function love.update(dt)
    local turnSpeed = 10

    if love.keyboard.isDown('right') then
         shipAngle = shipAngle + turnSpeed * dt
    end

    if love.keyboard.isDown('left') then
        shipAngle = shipAngle - turnSpeed * dt
    end

    shipAngle = shipAngle % (2 * math.pi)

    if love.keyboard.isDown('up') then
        local shipSpeed = 100
        shipSpeedX = shipSpeedX + math.cos(shipAngle) * shipSpeed * dt
        shipSpeedY = shipSpeedY + math.sin(shipAngle) * shipSpeed * dt
    end

    shipX = (shipX + shipSpeedX * dt) % arenaWidth
    shipY = (shipY + shipSpeedY * dt) % arenaHeight
end

function love.draw()
    love.graphics.setColor(0, 0, 1)
    love.graphics.circle('fill', shipX, shipY, 30)

    local shipCircleDistance = 20
    love.graphics.setColor(0, 1, 1)
    love.graphics.circle(
        'fill',
        shipX + math.cos(shipAngle) * shipCircleDistance,
        shipY + math.sin(shipAngle) * shipCircleDistance,
        5
    )

    -- Temporary
    love.graphics.setColor(1, 1, 1)
    love.graphics.print(table.concat({
        'shipAngle: '..shipAngle,
        'shipX: '..shipX,
        'shipY: '..shipY,
        'shipSpeedX: '..shipSpeedX,
        'shipSpeedY: '..shipSpeedY,
    }, '\n'))
end