function love.load()
    birdY = 200
    birdYSpeed = 0

    birdX = 62
    birdWidth = 30
    birdHeight = 25

    playingAreaWidth = 300
    playingAreaHeight = 388

    pipeSpaceHeight = 100
    pipeWidth = 54

    function newPipeSpaceY()
        local pipeSpaceYMin = 54
        local pipeSpaceY = love.math.random(
            pipeSpaceYMin,
            playingAreaHeight - pipeSpaceHeight - pipeSpaceYMin
        )
        return pipeSpaceY
    end

    pipe1X = playingAreaWidth
    pipe1SpaceY = newPipeSpaceY()

    pipe2X = playingAreaWidth + ((playingAreaWidth + pipeWidth) / 2)
    pipe2SpaceY = newPipeSpaceY()

    score = 0
end

function love.update(dt)
    birdYSpeed = birdYSpeed + (516 * dt)
    birdY = birdY + (birdYSpeed * dt)

    local function movePipe(pipeX, pipeSpaceY)
        pipeX = pipeX - (60 * dt)

        if (pipeX + pipeWidth) < 0 then
            pipeX = playingAreaWidth
            pipeSpaceY = newPipeSpaceY()
        end

        return pipeX, pipeSpaceY
    end

    pipe1X, pipe1SpaceY = movePipe(pipe1X, pipe1SpaceY)
    pipe2X, pipe2SpaceY = movePipe(pipe2X, pipe2SpaceY)

    function isBirdCollidingWithPipe(pipeX, pipeSpaceY)
        return
        -- Left edge of bird is to the left of the right edge of pipe
        birdX < (pipeX + pipeWidth)
        and
         -- Right edge of bird is to the right of the left edge of pipe
        (birdX + birdWidth) > pipeX
        and (
            -- Top edge of bird is above the bottom edge of first pipe segment
            birdY < pipeSpaceY
            or
            -- Bottom edge of bird is below the top edge of second pipe segment
            (birdY + birdHeight) > (pipeSpaceY + pipeSpaceHeight)
        )
    end

    if isBirdCollidingWithPipe(pipe1X, pipe1SpaceY)
    or isBirdCollidingWithPipe(pipe2X, pipe2SpaceY)
    or birdY > playingAreaHeight then
        love.load()
    end

    if birdX > (pipe1X + pipeWidth) then
        score = score + 1
    end
end

function love.keypressed(key)
    if birdY > 0 then
        birdYSpeed = -165
    end
end

function love.draw()
    love.graphics.setColor(.14, .36, .46)
    love.graphics.rectangle('fill', 0, 0, playingAreaWidth, playingAreaHeight)

    love.graphics.setColor(.87, .84, .27)
    love.graphics.rectangle('fill', birdX, birdY, birdWidth, birdHeight)

    local function drawPipe(pipeX, pipeSpaceY)
        love.graphics.setColor(.37, .82, .28)
        love.graphics.rectangle(
            'fill',
            pipeX,
            0,
            pipeWidth,
            pipeSpaceY
        )
        love.graphics.rectangle(
            'fill',
            pipeX,
            pipeSpaceY + pipeSpaceHeight,
            pipeWidth,
            playingAreaHeight - pipeSpaceY - pipeSpaceHeight
        )
    end

    drawPipe(pipe1X, pipe1SpaceY)
    drawPipe(pipe2X, pipe2SpaceY)

    love.graphics.setColor(1, 1, 1)
    love.graphics.print(score, 15, 15)
end