extends Node
## SaveManager — autoload singleton
## Sauvegarde automatique (toutes les 30s + à la mort).
## Persiste : XP, niveau, inventaire, achievements débloqués, position spawn.

const SAVE_PATH := "user://save.json"
const AUTOSAVE_INTERVAL: float = 30.0

var _autosave_timer: float = 0.0
var _player: Node = null


func _ready() -> void:
	# Connect mort du joueur dès que le nœud player existe
	# (on le cherche au premier process car le joueur est spawné après)
	pass


func register_player(player: Node) -> void:
	_player = player
	if player.has_signal("player_died"):
		if not player.player_died.is_connected(_on_player_died):
			player.player_died.connect(_on_player_died)


func _process(delta: float) -> void:
	_autosave_timer += delta
	if _autosave_timer >= AUTOSAVE_INTERVAL:
		_autosave_timer = 0.0
		save_game()


func save_game() -> void:
	var data: Dictionary = {}

	# --- PlayerProgress ---
	var pp: Node = get_node_or_null("/root/PlayerProgress")
	if pp != null:
		data["xp"] = pp.current_xp
		data["level"] = pp.level

	# --- Inventory ---
	var main: Node = get_tree().get_first_node_in_group("main")
	if main != null and main.get("inventory") != null:
		var inv: Node = main.inventory
		var slots: Array = []
		if inv.has_method("get_all_slots"):
			slots = inv.call("get_all_slots")
		else:
			# Fallback: read slots array directly if exposed
			if "slots" in inv:
				for s in inv.slots:
					slots.append(s)
		data["inventory"] = slots

	# --- Achievements ---
	var am: Node = get_node_or_null("/root/AchievementManager")
	if am != null and am.get("_unlocked") != null:
		data["achievements"] = am._unlocked

	# --- Spawn position ---
	if is_instance_valid(_player):
		var pos: Vector3 = _player.global_position
		data["spawn"] = {"x": pos.x, "y": pos.y, "z": pos.z}

	# Write JSON
	var file := FileAccess.open(SAVE_PATH, FileAccess.WRITE)
	if file == null:
		push_warning("SaveManager: impossible d'ouvrir " + SAVE_PATH)
		return
	file.store_string(JSON.stringify(data, "\t"))
	file.close()


func load_game() -> bool:
	if not FileAccess.file_exists(SAVE_PATH):
		return false

	var file := FileAccess.open(SAVE_PATH, FileAccess.READ)
	if file == null:
		return false
	var raw: String = file.get_as_text()
	file.close()

	var parsed = JSON.parse_string(raw)
	if parsed == null or not (parsed is Dictionary):
		push_warning("SaveManager: save corrompu")
		return false

	var data: Dictionary = parsed

	# --- PlayerProgress ---
	var pp: Node = get_node_or_null("/root/PlayerProgress")
	if pp != null:
		if data.has("xp"):
			pp.current_xp = int(data["xp"])
		if data.has("level"):
			pp.level = int(data["level"])
		pp.emit_state()

	# --- Achievements ---
	var am: Node = get_node_or_null("/root/AchievementManager")
	if am != null and data.has("achievements"):
		am._unlocked = data["achievements"]

	# --- Inventory ---
	var main: Node = get_tree().get_first_node_in_group("main")
	if main != null and main.get("inventory") != null and data.has("inventory"):
		var inv: Node = main.inventory
		var slots: Array = data["inventory"]
		if inv.has_method("load_slots"):
			inv.call("load_slots", slots)
		elif "slots" in inv:
			# Best-effort direct assignment
			for i: int in range(min(slots.size(), inv.slots.size())):
				inv.slots[i] = slots[i]

	# --- Spawn position ---
	if is_instance_valid(_player) and data.has("spawn"):
		var sp: Dictionary = data["spawn"]
		_player.global_position = Vector3(
			float(sp.get("x", 0.0)),
			float(sp.get("y", 55.0)),
			float(sp.get("z", 0.0))
		)

	return true


func _on_player_died() -> void:
	save_game()