game = {}

function game.load()
    game.clock = 0

    --initialize player
    game.player_size = img["player"]:getWidth()
    game.playerX = 1280 / 2
    game.playerY = 720 / 2 + 200
    game.playerVel = 280

    --initialize bullets
    game.bullet_size = img["bullet"]:getWidth()
    game.bulletVel = 800
    game.bullets = {}
    game.bulletCooldown = 6

    cooldownRemaining = 0

    game.score = 0

end

function game.update(dt)

    --setting clock
    game.clock = game.clock + dt

    --movement
        if joystick:isGamepadDown("dpleft") then
        game.playerX = game.playerX - game.playerVel * dt
    elseif joystick:isGamepadDown("dpright") then
        game.playerX = game.playerX + game.playerVel * dt
    end

    if joystick:isGamepadDown("dpup") then
        game.playerY = game.playerY - game.playerVel * dt
    elseif joystick:isGamepadDown("dpdown") then
        game.playerY = game.playerY + game.playerVel * dt
    end

    --keep player onscreen
    if game.playerY > 720 - game.player_size/2 then
        game.playerY = 720 - game.player_size/2
    end
    if game.playerY < 0 + game.player_size/2 then
        game.playerY = 0 + game.player_size/2
    end
    if game.playerX > 1000 - game.player_size/2 then
        game.playerX = 1000 - game.player_size/2
    end
    if game.playerX < 280 + game.player_size/2 then
        game.playerX = 280 + game.player_size/2
    end


    if cooldownRemaining > 0 then
        cooldownRemaining = cooldownRemaining - 1
    end

    --spawn new bullets when a is pressed
    if joystick:isGamepadDown("a") and cooldownRemaining <=0 then
        cooldownRemaining = game.bulletCooldown
        NewBullet(10)
        NewBullet(-10)
        NewBullet(0)
    end


    --update bullet positions
    for i, v in ipairs(game.bullets) do
        v.X = v.X + game.bulletVel * dt * math.sin(math.rad(v.angle))
        v.Y = v.Y - game.bulletVel * dt * math.cos(math.rad(v.angle))
        if v.Y < 0 or v.X < 280 or v.X > 1000 then
            table.remove(game.bullets, i)
        end
    end

end

function game.draw()

    love.graphics.draw(img["overlay"], 0, 0)

    love.graphics.draw(img["player"], game.playerX, game.playerY,
                                         0, 1, 1, game.player_size/2, game.player_size/2)

    for i,v in ipairs(game.bullets) do
        love.graphics.draw(img["bullet"], v.X, v.Y, 0, 1, 1, game.bullet_size/2, game.bullet_size/2)
    end

end

function NewBullet(angle)

    --create new bullet
    local bullet = {}
    bullet.X = game.playerX
    bullet.Y = game.playerY - 16
    bullet.angle = angle
    table.insert(game.bullets, bullet)
end