extends Node
# Explicit source-only experiment. Never connects to the production room controller.
var server := TCPServer.new()
var peers: Array[Dictionary] = []
var game: Node
var session := ""
var phase := "powered_off"
var scans := 0
var last_credits := 0
var seen: Dictionary = {}
var rfid_device := "cab1_rfid1"
var inject_rfid := false

func _ready() -> void:
	var args := OS.get_cmdline_user_args()
	if not "--glitch-lab" in args:
		push_error("This scene requires --glitch-lab")
		get_tree().quit(2)
		return
	inject_rfid = "--lab-inject-rfid" in args
	if inject_rfid and HardwareManager.real_gpio:
		push_error("Choose physical RFID or lab injection, never both")
		get_tree().quit(2)
		return
	for arg in args:
		if arg.begins_with("--lab-rfid-device="):
			rfid_device = arg.trim_prefix("--lab-rfid-device=")
	session = Crypto.new().generate_random_bytes(16).hex_encode()
	RoomRuntime.active_assignment = null
	HardwareManager.active_cabinet = null
	game = load("res://games/pacman/pacman.gd").new()
	# Set before _ready to prevent automatic boot.
	game.run_config = _config()
	add_child(game)
	game.game_started.connect(func(): phase = "playing")
	game.game_won.connect(func(): phase = "won")
	game.game_lost.connect(func(): phase = "lost")
	game.power_state_changed.connect(_power)
	reset()
	if server.listen(18768, "127.0.0.1") != OK:
		push_error("Godot lab port 18768 unavailable")
		get_tree().quit(2)
		return
	print("GLITCH GODOT LAB READY (no room controller or reward outputs)")

func _config() -> Dictionary:
	return {"power_on_device": "__lab_operator_only__", "rfid_credit_device": rfid_device,
		"score_to_win": 500, "boards_to_win": 0, "starting_lives": 3}

func _power(value: String) -> void:
	phase = {"off": "powered_off", "booting": "booting", "ready": "ready"}.get(value, value)

func reset() -> void:
	game.configure(_config())
	scans = 0
	last_credits = 0
	if inject_rfid: game.receive_device_feedback({"fresh": true, "events": [], "devices": []})

func feed_rfid(feedback: Dictionary) -> void:
	# Only RFID input is admitted. No button (including BCM23) can power this lab on.
	var filtered := feedback.duplicate(true)
	filtered["events"] = feedback.get("events", []).filter(func(e): return e.get("kind") == "rfid")
	game.receive_device_feedback(filtered)
	_sync_credit()

func _sync_credit() -> void:
	if game.credits > last_credits: scans += 1
	last_credits = game.credits

func snapshot() -> Dictionary:
	_sync_credit()
	return {"session": session, "cabinet_id": "cabinet_01", "phase": phase,
		"credits": game.credits, "scans": scans, "simulated": false,
		"rfid_injection": inject_rfid, "score": game.model.score}

func reply(ok: bool, duplicate: bool, message: String) -> Dictionary:
	return {"accepted": ok, "duplicate": duplicate, "message": message, "state": snapshot()}

func execute(cmd: Dictionary) -> Dictionary:
	var action := str(cmd.get("action", ""))
	if action == "snapshot": return reply(true, false, "Real Godot cabinet state")
	var id := str(cmd.get("id", ""))
	if id.is_empty() or id.length() > 128 or cmd.get("session") != session:
		return reply(false, false, "Invalid command ID or stale session")
	if seen.has(id):
		var previous: Dictionary = seen[id]
		if previous.command != cmd: return reply(false, false, "Command ID reused with different contents")
		return reply(previous.accepted, true, previous.message)
	var now := int(Time.get_unix_time_from_system() * 1000)
	var expires := int(cmd.get("expires_ms", 0))
	if expires <= now or expires - now > 30000: return reply(false, false, "Expired command")
	var ok := false
	match action:
		"power_on":
			if phase == "powered_off": ok = game.power_on()
		"start":
			if phase == "ready": ok = game.start_game()
		"scan":
			if inject_rfid and phase == "ready" and game.credits == 0:
				# Synthetic fixture passes through the real admission logic, never sets credits.
				game.receive_device_feedback({"fresh": true, "events": [], "devices": []})
				feed_rfid({"fresh": true,
					"events": [{"id": id, "kind": "rfid", "device": rfid_device, "value": "LAB-CARD", "age_ms": 0}],
					"devices": [{"id": rfid_device, "kind": "rfid", "value": "LAB-CARD", "age_ms": 0}]})
				ok = game.credits == 1
		"reset":
			reset()
			ok = true
	var message := "Executed by Godot" if ok else "Action unavailable; scan a physical card or play to the score target"
	seen[id] = {"command": cmd.duplicate(true), "accepted": ok, "message": message}
	if seen.size() > 256: seen.erase(seen.keys()[0])
	return reply(ok, false, message)

func _process(_delta: float) -> void:
	if game == null: return
	if HardwareManager.real_gpio and HardwareManager.client != null:
		feed_rfid(HardwareManager.client.get_feedback())
	while server.is_connection_available():
		var peer := server.take_connection()
		if peers.size() >= 8:
			peer.disconnect_from_host()
		else:
			peers.append({"peer": peer, "data": "", "deadline": Time.get_ticks_msec() + 1800})
	for item in peers.duplicate():
		var peer: StreamPeerTCP = item.peer
		peer.poll()
		var available := peer.get_available_bytes()
		if available > 0:
			var packet := peer.get_data(mini(available, 8193))
			if packet[0] == OK: item.data += packet[1].get_string_from_utf8()
		if item.data.length() > 8192 or Time.get_ticks_msec() > item.deadline or peer.get_status() != StreamPeerTCP.STATUS_CONNECTED:
			peer.disconnect_from_host()
			peers.erase(item)
		elif "\n" in item.data:
			var cmd = JSON.parse_string(item.data.get_slice("\n", 0))
			var result := execute(cmd) if cmd is Dictionary else reply(false, false, "Invalid JSON command")
			peer.put_data((JSON.stringify(result) + "\n").to_utf8_buffer())
			peer.disconnect_from_host()
			peers.erase(item)

func _exit_tree() -> void:
	server.stop()
	for item in peers: item.peer.disconnect_from_host()