extends Node3D
const PlayerScript = preload("res://scripts/player.gd")
const ZombieScript = preload("res://scripts/zombie.gd")
const RoomScript = preload("res://scripts/room.gd")
const MUSIC_PATH := "res://assets/audio/music/zombie_industrial_loop.ogg"
const MUSIC_VOLUME_DB := -11.0
var player: CharacterBody3D
var room: Node3D
var music: AudioStreamPlayer
var music_started := false
var hud: Label
var score := 0
var wave := 0
var alive := 0
var spawning := false
var wave_pending := false
var smoke := false
var awaiting_web_start := false
var start_label: Label

func _ready() -> void:
	smoke = "--smoke" in OS.get_cmdline_user_args()
	room = Node3D.new()
	room.set_script(RoomScript)
	add_child(room)
	player = CharacterBody3D.new()
	player.set_script(PlayerScript)
	player.position = Vector3(0, 0.1, 0)
	add_child(player)
	var envnode := WorldEnvironment.new()
	var env := Environment.new()
	env.background_mode = Environment.BG_COLOR
	env.background_color = Color(0.08, 0.12, 0.19)
	env.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
	env.ambient_light_color = Color(0.65, 0.73, 0.85)
	env.ambient_light_energy = 0.65
	envnode.environment = env
	add_child(envnode)
	var light := OmniLight3D.new()
	light.position = Vector3(0, 4.5, 0)
	light.omni_range = 24
	light.light_energy = 3
	light.shadow_enabled = true
	add_child(light)
	var canvas := CanvasLayer.new()
	add_child(canvas)
	hud = Label.new()
	hud.position = Vector2(24, 20)
	hud.add_theme_font_size_override("font_size", 24)
	canvas.add_child(hud)
	var cross := Label.new()
	cross.text = "+"
	cross.add_theme_font_size_override("font_size", 30)
	canvas.add_child(cross)
	cross.set_anchors_and_offsets_preset(Control.PRESET_CENTER)
	_setup_music()
	if OS.has_feature("web"):
		awaiting_web_start = true
		start_label = Label.new()
		start_label.text = "CLICCA PER INIZIARE\nWASD: movimento · clic sinistro: spara · destro: granata · R: ricarica"
		start_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
		start_label.add_theme_font_size_override("font_size", 24)
		start_label.mouse_filter = Control.MOUSE_FILTER_IGNORE
		canvas.add_child(start_label)
		start_label.set_anchors_and_offsets_preset(Control.PRESET_CENTER)
	else:
		_start_music()
		_next_wave()
	if smoke:
		get_tree().create_timer(12).timeout.connect(func():
			print("SMOKE: wave=", wave, " alive=", alive, " player_hp=", player.hp)
			get_tree().quit())

func _unhandled_input(event: InputEvent) -> void:
	if awaiting_web_start and event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_LEFT:
		awaiting_web_start = false
		start_label.queue_free()
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
		# Il browser concede l'audio solo dopo un gesto dell'utente: qui il click.
		_start_music()
		_next_wave()

## Colonna sonora: industrial metal strumentale su loop senza giunzione udibile.
func _setup_music() -> void:
	music = AudioStreamPlayer.new()
	music.name = "Music"
	music.stream = load(MUSIC_PATH)
	music.volume_db = MUSIC_VOLUME_DB
	if music.stream is AudioStreamOggVorbis:
		music.stream.loop = true
	add_child(music)
	music.add_to_group("music")
	# Rete di sicurezza: se il flag di loop mancasse, il brano riparte a fine coda.
	music.finished.connect(_restart_music)

func _start_music() -> void:
	if music_started or music == null:
		return
	music_started = true
	music.play()

func _restart_music() -> void:
	if music_started and is_instance_valid(music):
		music.play()

func _process(_dt: float) -> void:
	if hud:
		hud.text = "VITA %d    MUNIZIONI %d/30    ONDATA %d    PUNTI %d\nWASD · mouse · sinistro: spara · destro: granata · R: ricarica · spazio: salto · Esc: mouse" % [player.hp, player.ammo, wave, score]
		hud.text += "\nGRANATA: " + ("PRONTA" if player.grenade_cooldown <= 0 else "%d s" % ceili(player.grenade_cooldown))
		if player.reloading:
			hud.text += "\nRICARICA..."
		if player.hp <= 0:
			hud.text += "\nSEI MORTO — premi R per ricominciare"

func zombies_for_wave(number: int) -> int:
	return 4 + number * 2

func _next_wave() -> void:
	wave_pending = false
	if player.hp <= 0 or spawning:
		return
	wave += 1
	spawning = true
	for i in zombies_for_wave(wave):
		if player.hp <= 0:
			break
		_spawn(i % 4)
		await get_tree().create_timer(0.8).timeout
	spawning = false
	_check_wave()

func _spawn(index: int) -> void:
	var centers := [Vector3(0, 0, -9), Vector3(0, 0, 9), Vector3(-9, 0, 0), Vector3(9, 0, 0)]
	var inward: Vector3 = -centers[index].normalized()
	var zombie := CharacterBody3D.new()
	zombie.set_script(ZombieScript)
	zombie.player = player
	zombie.position = centers[index] - inward * 1.2
	add_child(zombie)
	alive += 1
	zombie.killed.connect(func(headshot: bool):
		score += 150 if headshot else 100
		alive -= 1
		_check_wave())
	var tween := zombie.create_tween()
	zombie.entry_tween = tween
	tween.tween_property(zombie, "position", centers[index] + Vector3(0, 1.55, 0), 1.2)
	tween.tween_callback(func():
		for glass in room.glass_panes.duplicate():
			if is_instance_valid(glass) and Vector2(glass.position.x - centers[index].x, glass.position.z - centers[index].z).length() < 2:
				room.shatter_glass(glass))
	tween.tween_property(zombie, "position", centers[index] + inward * 1.4 + Vector3(0, 0.1, 0), 0.8)
	tween.tween_callback(func(): zombie.entering = false)

func _check_wave() -> void:
	if alive == 0 and not spawning and not wave_pending and player.hp > 0:
		wave_pending = true
		get_tree().create_timer(3).timeout.connect(_next_wave)