extends Node

# Loads ahog.json once into typed Resource arrays:
#   Global.database.settings  -> SettingsData
#   Global.database.levels    -> Array[LevelEntry]
#   Global.database.scenes    -> Array[SceneEntry]
#
# save() round-trips back to the same JSON format so game progress
# (per-scene lock state) persists across runs.

class DB extends RefCounted:
	var settings: SettingsData
	var levels: Array[LevelEntry] = []
	var scenes: Array[SceneEntry] = []
	var _path: String

	const _SETTINGS_PROPS := [
		{"name": "langue", "type": "1", "auto_increment": "0"},
		{"name": "gyroscope", "type": "0", "auto_increment": "0"},
		{"name": "ambient_sound", "type": "0", "auto_increment": "0"},
		{"name": "resolution", "type": "3", "auto_increment": "0"},
		{"name": "fullscreen", "type": "0", "auto_increment": "0"},
		{"name": "version", "type": "0", "auto_increment": "0"},
	]
	const _LEVELS_PROPS := [
		{"name": "name", "type": "3", "auto_increment": "0"},
		{"name": "thumb", "type": "4", "auto_increment": "0"},
	]
	const _SCENES_PROPS := [
		{"name": "lock", "type": "0", "auto_increment": "0"},
		{"name": "label", "type": "3", "auto_increment": "0"},
		{"name": "key", "type": "3", "auto_increment": "0"},
		{"name": "level", "type": "table", "table_name": "levels", "auto_increment": "0"},
		{"name": "mesh", "type": "3", "auto_increment": "0"},
		{"name": "label_counter", "type": "1", "auto_increment": "0"},
		{"name": "counter", "type": "1", "auto_increment": "0"},
	]

	func _init(path: String) -> void:
		_path = path
		var f := FileAccess.open(path, FileAccess.READ)
		if f == null:
			push_error("[Database] Cannot open " + path)
			return
		var doc = JSON.parse_string(f.get_as_text())
		f.close()
		if not (doc is Dictionary):
			push_error("[Database] Invalid JSON in " + path)
			return
		for table in doc.get("tables", []):
			match table.get("table_name", ""):
				"settings": settings = _load_settings(table.get("data", []))
				"levels": levels = _load_levels(table.get("data", []))
				"scenes": scenes = _load_scenes(table.get("data", []))

	func _load_settings(data: Array) -> SettingsData:
		var s := SettingsData.new()
		if data.size() >= 6:
			s.langue = int(data[0])
			s.gyroscope = bool(int(data[1]))
			s.ambient_sound = bool(int(data[2]))
			s.resolution = str(data[3])
			s.fullscreen = bool(int(data[4]))
			s.version = str(data[5])
		return s

	func _load_levels(data: Array) -> Array[LevelEntry]:
		var result: Array[LevelEntry] = []
		const W := 2
		@warning_ignore("integer_division")
		for i in range(data.size() / W):
			var l := LevelEntry.new()
			l.index = i
			l.name = str(data[i * W + 0])
			l.thumb = str(data[i * W + 1])
			result.append(l)
		return result

	func _load_scenes(data: Array) -> Array[SceneEntry]:
		var result: Array[SceneEntry] = []
		const W := 7
		@warning_ignore("integer_division")
		for i in range(data.size() / W):
			var s := SceneEntry.new()
			s.lock = bool(int(data[i * W + 0]))
			s.label = str(data[i * W + 1])
			s.key = str(data[i * W + 2])
			s.level = int(data[i * W + 3])
			s.mesh = str(data[i * W + 4])
			s.label_counter = str(data[i * W + 5])
			s.counter = int(data[i * W + 6])
			result.append(s)
		return result

	func scenes_for_level(level_idx: int) -> Array[SceneEntry]:
		var result: Array[SceneEntry] = []
		for s in scenes:
			if s.level == level_idx:
				result.append(s)
		return result

	func level_by_index(idx: int) -> LevelEntry:
		for l in levels:
			if l.index == idx:
				return l
		return null

	func save() -> void:
		var doc := {
			"GDDB_ver": "2.0",
			"db_name": "ahog",
			"tables": [
				{"table_name": "settings", "props": _SETTINGS_PROPS, "data": _dump_settings()},
				{"table_name": "levels", "props": _LEVELS_PROPS, "data": _dump_levels()},
				{"table_name": "scenes", "props": _SCENES_PROPS, "data": _dump_scenes()},
			],
		}
		var f := FileAccess.open(_path, FileAccess.WRITE)
		if f == null:
			push_error("[Database] Cannot write " + _path)
			return
		f.store_string(JSON.stringify(doc))
		f.close()

	func _dump_settings() -> Array:
		return [
			str(settings.langue),
			str(int(settings.gyroscope)),
			str(int(settings.ambient_sound)),
			settings.resolution,
			str(int(settings.fullscreen)),
			settings.version,
		]

	func _dump_levels() -> Array:
		var out: Array = []
		for l in levels:
			out.append_array([l.name, l.thumb])
		return out

	func _dump_scenes() -> Array:
		var out: Array = []
		for s in scenes:
			out.append_array([
				str(int(s.lock)),
				s.label,
				s.key,
				str(s.level),
				s.mesh,
				s.label_counter,
				str(s.counter),
			])
		return out

func initialize() -> DB:
	return DB.new(save_database_in())

func save_database_in() -> String:
	if OS.get_name() == "Android":
		copy_database()
		return android_path()
	return normal_path()

func android_path() -> String:
	return "user://database.json"

func normal_path() -> String:
	return "res://db/ahog.json"

func copy_database() -> void:
	if FileAccess.file_exists(android_path()):
		return
	var src := FileAccess.open(normal_path(), FileAccess.READ)
	var dst := FileAccess.open(android_path(), FileAccess.WRITE)
	dst.store_string(src.get_as_text())
	dst.close()
	src.close()