-- title:  1bit shmup
-- author: pixelbath
-- desc:   idk
-- script: lua

t=0

local bullet_speed = 6
local bullet_timer = 0
local bullet_timer_start = 10

-- props: x, y, vx, vy, type
local player_bullets = {}

local player = {
	x=20,y=60,
	vx=0,vy=0,
	speed=1.5,
	sp=257,
	fire_t=0,
	fire_held=false,
	gun_type=1,
	gun_level=1,
}

local enemies = {}

function add_enemy(en_type, xpos, ypos)
	table.insert(enemies, {
		x=xpos, y=ypos,
		type=en_type,
		t=0,
	})
end

function mod(a, b)
	return math.floor(a-(math.floor(a/b)*b))
end

-- TODO: various types
function add_bullet()
	sfx(0, 'D-6', 10, 0, 11, 4)
	table.insert(player_bullets, {
		x=player.x + 8,
		y=player.y + 3,
		vx = 0,
		vy = 0,
	})
end

function draw_player()
	local engine_spr = 274
	if player.vx > 0 then
		engine_spr = 306
	elseif player.vx < 0 then
		engine_spr = 290
	end

	-- draw engine fire then player
	-- spr(engine_spr, player.x-8, player.y+1)
	spr(player.sp, player.x, player.y, 0, 1, 0, 0, 2, 2)

end

function draw_bullets()
	for key,val in ipairs(player_bullets) do
		spr(291, val.x, val.y, 0, 1, 0, 0, 2, 1)
	end
end

-- also handle powerups since they're colliders
function draw_enemies()

end

function handle_input()
	player.vx = 0
	player.vy = 0
	if btn(0) then
		player.vy=-player.speed
	end
	if btn(1) then
		player.vy=player.speed
	end
	if btn(2) then
		player.vx=-player.speed
	end
	if btn(3) then
		player.vx=player.speed
	end

	-- slow down diagonal movements
	if player.vx * player.vy ~= 0 then
		player.vx = player.vx * 0.707
		player.vy = player.vy * 0.707
	end

	player.x = player.x + player.vx
	player.y = player.y + player.vy

	if player.x < 5 then player.x = 5 end
	if player.x > 220 then player.x = 220 end
	if player.y < 5 then player.y = 5 end
	if player.y > 128 then player.y = 128 end

	player.fire_held = false
	if btn(4) then
		if player.fire_t <= 0 then
			player.fire_t = bullet_timer_start
			add_bullet()
		else
			player.fire_t = player.fire_t - 1
		end
		player.fire_held = true
	else
		player.fire_t = 0
	end

	-- debug
	if btnp(5) then
		player.gun_type = mod(player.gun_type + 1, 3) + 1
	end
end

function TIC()
	handle_input()

	for key,val in ipairs(player_bullets) do
		val.x = val.x + bullet_speed
		if val.x > 240 then
			table.remove(player_bullets, key)
		end
	end

	cls(0)
	draw_player()
	draw_bullets()

	dbg("type:"..tostring(player.gun_type), 0)
	dbg(tostring(player.fire_held), 1)
	dbg(tostring(mod(t/3, 5) + 1), 2)
	-- dbg(tostring(player.vy), 3)
	t=t+1
end

function dbg(msg, line_no)
	print(msg, 5, line_no * 7, 5, true, 1, true)
end

-- <SPRITES>
-- 001:000000000000000000000ccc00cccccccccc00c000c00c000ccccccc0c0c0c0c
-- 002:0000000000000000cc00000000000000000000000ccc0000ccccc000c000ccc0
-- 003:0000000000000000000000cc000cccccccccc0c000c00c000ccccccc0ccccccc
-- 004:0000000000000000cc00000000000000000000000ccc0000ccccc000cc00ccc0
-- 005:00000000000000000000000000000ccc00cccccc0cc00c00cccccccc0ccccccc
-- 006:000000000000000000000000cc000000000000000cc00000ccccc000ccc0ccc0
-- 007:000000000000000000000000000000000000000000cccccc0c000000cccccccc
-- 008:000000000000000000000000000000000000000000000000ccccc000ccccccc0
-- 009:0000000000000000000000000000000000000ccc000cc0c0ccc00c000c00c000
-- 010:00000000000000000000000000000000cc000000c00000000cccc0000000ccc0
-- 011:00000000000000000000000000000ccc00ccc00cccc00c000c0000cc0cc0c000
-- 012:000000000000000000000000cc000000000000000ccc0000c00cc0000000ccc0
-- 013:0000000000000000000000cc000ccc0cccc000c000c00c000c0000cc0cc0c000
-- 014:0000000000000000cc00000000000000000000000ccc0000c00cc0000000ccc0
-- 017:0ccccccc00c00c00cccc00c000cccccc00000ccc000000000000000000000000
-- 018:ccccc0000ccc00000000000000000000cc000000000000000000000000000000
-- 019:0c0c0c0c00c00c00ccccc0c0000ccccc000000cc000000000000000000000000
-- 020:c0ccc0000ccc00000000000000000000cc000000000000000000000000000000
-- 021:cc0c0c0c0cc00c0000cccccc00000ccc00000000000000000000000000000000
-- 022:c00cc0000cc0000000000000cc00000000000000000000000000000000000000
-- 023:0ccccccc00cccccc000000000000000000000000000000000000000000000000
-- 024:ccccc00000000000000000000000000000000000000000000000000000000000
-- 025:ccc00c00000ccccc00000ccc0000000000000000000000000000000000000000
-- 026:0ccc0000c0000000cc0000000000000000000000000000000000000000000000
-- 027:0c0000ccccc00c0000ccc00c00000ccc00000000000000000000000000000000
-- 028:c00cc0000ccc000000000000cc00000000000000000000000000000000000000
-- 029:0c0000cc00c00c00ccc000c0000ccc0c000000cc000000000000000000000000
-- 030:c00cc0000ccc00000000000000000000cc000000000000000000000000000000
-- 033:000000000000000000000ccc00ccc00ccc0000c000c00c000c0000cc0cc0c000
-- 034:0000000000000000cc00000000000000000000000ccc0000c00cc0000000ccc0
-- 035:000000000c0c0ccc0000c0cc00000000000000000000c0cc0c0c0ccc00000000
-- 036:00000000ccccccccccccccc00000000000000000ccccccc0cccccccc00000000
-- 049:0c0000cc00c00c00cc0000c000ccc00c00000ccc000000000000000000000000
-- 050:c00cc0000ccc00000000000000000000cc000000000000000000000000000000
-- 051:0000c0c0000000000000000000000000000000000000000000000000000c0c0c
-- 052:cc0cccc00000000cc0c0ccc000000000000000000c0cccc00000000cccccccc0
-- </SPRITES>

-- <WAVES>
-- 000:123345667889abbcdeff1fedcba86642
-- </WAVES>

-- <SFX>
-- 000:00d050808060c040d020e020f010f010f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000f000502000000000
-- </SFX>

-- <PALETTE>
-- 000:1a1c2c5d275db13e53ef7d57ffcd75a7f07038b76425717929366f3b5dc941a6f673eff7f4f4f494b0c2566c86333c57
-- </PALETTE>