g_imgTable = {
	["tank"] = nil,
	['bullet'] = nil
}

g_fired = {
}

g_enems = {
	
}

cords = {['x'] = nil, ['y'] = nil}
selfcords = {['x'] = 0, ['y'] = 0, ['dx'] = 0, ['dy'] = 0}
screen = {['w'] = nil, ['h'] = nil}
moveState = {up = nil, down = nil, left = nil, right = nil}


step = 100
speed = 300
bulletCount = 0
oldState = false

function addEnemy() --todo
	
end

function setParent() --todo
end

function love.load()
	love.graphics.setBackgroundColor(255, 255, 255)
	screen.w = love.graphics.getWidth()
	screen.h = love.graphics.getHeight()
	selfcords.x = screen.w / 2
	selfcords.y = screen.h / 2
	g_imgTable["tank"] = love.graphics.newImage('tank.png')
	g_imgTable["bullet"] = love.graphics.newImage('bullet.png')
end

function love.update(dt)
	cords.x, cords.y = love.mouse.getPosition()
	interceptInput()
	for k, v in pairs(g_fired) do
		v.x = v.x + math.cos(v.ang) * speed * dt;
		v.y = v.y + math.sin(v.ang) * speed * dt;
		
		if v.x > screen.w or v.x < 0 or v.y > screen.h or v.y < 0 then
			releaseBullet(v)
		end
	end
	
	if selfcords.dx ~= 0 or selfcords.dy ~= 0 then
		selfcords.x = selfcords.x + selfcords.dx * dt
		selfcords.y = selfcords.y + selfcords.dy * dt
		
		if selfcords.dx < 0 then
			selfcords.dx = selfcords.dx + step
		elseif selfcords.dx > 0 then
			selfcords.dx = selfcords.dx - step
		end
		
		if selfcords.dy < 0 then
			selfcords.dy = selfcords.dy + step
		elseif selfcords.dy > 0 then
			selfcords.dy = selfcords.dy - step
		end
	end
	
	local curState = love.keyboard.isDown(' ')
	
	if curState and not oldState  then
		createBullet()
	end
	bulletCount = bulletCount > 64 and 0 or bulletCount
	oldState = love.keyboard.isDown(' ')
end

function interceptInput()
	moveState.up = love.keyboard.isDown('w')
	moveState.down = love.keyboard.isDown('s')
	moveState.left = love.keyboard.isDown('a')
	moveState.right = love.keyboard.isDown('d')
	
	if moveState.up then
		selfcords.dy = selfcords.dy - step
	end
	if moveState.down then
		selfcords.dy = selfcords.dy + step
	end
	if moveState.left then
		selfcords.dx = selfcords.dx - step
	end
	if moveState.right then
		selfcords.dx = selfcords.dx + step
	end
end

function combineBullet(num, x, y, ang)
	return {['num'] = num, ['x'] = x, ['y'] = y, ['ang'] = ang}
end

function createBullet()
	local x, y = selfcords.x, selfcords.y
	local w, h = x - cords.x, y - cords.y
	local ang = math.atan2(h, w) + math.pi
	bulletCount = bulletCount + 1
	table.insert(g_fired, combineBullet(bulletCount, x + math.cos(ang) * 16, y + math.sin(ang) * 16, ang))
end

function releaseBullet(bullet)
	for k, v in ipairs(g_fired) do
		if v.num == bullet.num then
			table.remove(g_fired, k)
		end
	end
end

function love.draw()
	local x, y = selfcords.x, selfcords.y
	local w, h = x - cords.x, y - cords.y
	love.graphics.draw(g_imgTable["tank"], x, y, math.atan2(h, w) - math.pi / 2, 1, 1, 16, 16)
	
	for k, v in pairs(g_fired) do
		love.graphics.draw(g_imgTable["bullet"], v.x, v.y, 0, 1, 1, 8, 8)
	end
	
	love.graphics.setColor(0, 0, 0)
	love.graphics.print(#g_fired, 100, 100)
	love.graphics.setColor(255, 255, 255)
end