LÖVE

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if player.health<=0 and love.keyboard.isDown('r') then
	enemies = {} 
end

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require "bin/player"
require "bin/bullet"
require "bin/enemy"
require "bin/font"


function love.load()
	--Assets
	player.img = love.graphics.newImage('assets/player.png')
	playerLeft = love.graphics.newImage('assets/playerLeft.png')
	playerRight = love.graphics.newImage('assets/playerRight.png')
	bulletImg = love.graphics.newImage('assets/bullet.png')
	enemyImg = love.graphics.newImage('assets/enemy.png')
	gunSound = love.audio.newSource("assets/gun-sound.wav", "static")
	backgroundImg = love.graphics.newImage('assets/spaceBackground.png')
	
	--Background Music
	bgm = love.audio.newSource("assets/bgsong.mp3", "stream", true)
	love.audio.play(bgm)

	--Vital Variables
	gamestate = 'playing'
	screenWidth = love.graphics.getWidth()
	screenHeight = love.graphics.getHeight()
	default_font = love.graphics.newFont(20)

	--Loading Libraries
	player.load()
end

function love.keypressed(key)
	if gamestate == 'playing' then
		player.shoot(key)
	end
end

function love.update(dt)
	if gamestate == 'playing' then --so character doesn't move if in a menu
		UPDATE_PLAYER(dt)
		UPDATE_BULLET(dt)
		UPDATE_ENEMY(dt)
	end
end

function love.draw()
	love.graphics.draw(backgroundImg, 0, 0)

	if gamestate == 'playing' then --so character doesn't move if in a menu
		DRAW_PLAYER()
		DRAW_ENEMY()
		DRAW_FONT()
		DRAW_BULLET()
	end
end

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enemies = {}

enemies.width = 78
enemies.height = 78
enemies.speed = 150
enemies.timer = 0
enemies.timerLim = math.random(1,2)
screenWidth = love.graphics.getWidth()
enemies.spawnX = math.random(0, screenWidth - enemies.width) --spawn enemy between left or right side of the screen

function enemies.spawn(x,y)
	table.insert(enemies, {x=x, y=y})
end
--
function enemies.draw()
	for i,v in ipairs(enemies) do
		love.graphics.draw(enemyImg, v.x, v.y)
		--love.graphics.setColor(0,255,0) --set enemies to green
		--love.graphics.rectangle('fill', v.x, v.y, enemies.width, enemies.height)
	end
end
--
function enemies.move(dt)
	for i,v in ipairs(enemies) do
		v.y = v.y + enemies.speed * dt
	end
end
--
function enemies.boundary()
	for i,v in ipairs(enemies) do
		if v.y > screenHeight then
			table.remove(enemies, i)
		end

		--comparing two x and y values to see if they're overlapping and reduce health
		if v.x + enemies.width > player.x and 
		v.x < player.x + player.width and
		v.y + enemies.height > player.y and
		v.y < player.y + player.height then
			player.health = player.health - 1
			table.remove(enemies, i)
		end
	end
end
--
function enemies.collide()
	for i,v in ipairs(enemies) do
		for ia,va in ipairs(bullet) do
			if v.x + enemies.width > va.x and 
			v.x < va.x + bullet.width and
			v.y + enemies.height > va.y and
			v.y < va.y + bullet.height then
				player.points = player.points + 1
				table.remove(enemies, i)
				table.remove(bullet, ia)
			end
		end
	end
end

function enemies.spawningHandler(dt)
	enemies.timer = enemies.timer + dt
	if enemies.timer > enemies.timerLim then
		enemies.spawn(enemies.spawnX,-enemies.height)
		enemies.timer = 0
		enemies.timerLim = math.random(1,2)
		enemies.spawnX = math.random(0,screenWidth - enemies.width)
	end
end





--PARENT FUNCTIONS
function DRAW_ENEMY()
	enemies.draw()
end

function UPDATE_ENEMY(dt)
	enemies.move(dt)
	enemies.boundary()
	enemies.collide()
	enemies.spawningHandler(dt)
end