extends Node

# SettingsManager - Global singleton for handling game settings persistence
# Autoloaded as "SettingsManager"

const SETTINGS_FILE = "user://game_settings.cfg"

# Default values
var settings = {
	"video": {
		"fullscreen": true,
		"vsync": true,
		"resolution_idx": 1
	},
	"audio": {
		"master_volume": 0.8,
		"music_volume": 0.7,
		"sfx_volume": 0.9
	},
	"controls": {
		"powerup_1": KEY_1,
		"powerup_2": KEY_2,
		"powerup_3": KEY_3,
		"powerup_4": KEY_4,
		"grab": KEY_SPACE,
		"put": KEY_R,
		"attack_mode": KEY_Q,
		"spawn_boost": KEY_E,
		"tekton_grab": KEY_G
	}
}

signal settings_applied
signal control_remapped(action: String, key: int)

func _ready():
	load_settings()
	apply_all_settings()

func load_settings():
	var config = ConfigFile.new()
	var err = config.load(SETTINGS_FILE)
	
	if err == OK:
		for section in settings.keys():
			for key in settings[section].keys():
				settings[section][key] = config.get_value(section, key, settings[section][key])
		print("[Settings] Loaded.")
	else:
		print("[Settings] Using defaults.")

func save_settings():
	var config = ConfigFile.new()
	for section in settings.keys():
		for key in settings[section].keys():
			config.set_value(section, key, settings[section][key])
	config.save(SETTINGS_FILE)

func apply_all_settings():
	apply_video_settings()
	apply_audio_settings()
	emit_signal("settings_applied")

func apply_video_settings():
	var video = settings.video
	if video.fullscreen:
		DisplayServer.window_set_mode(DisplayServer.WINDOW_MODE_FULLSCREEN)
	else:
		DisplayServer.window_set_mode(DisplayServer.WINDOW_MODE_WINDOWED)
		
	if video.vsync:
		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED)
	else:
		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)

func apply_audio_settings():
	var audio = settings.audio
	set_bus_volume("Master", audio.master_volume)
	set_bus_volume("Music", audio.music_volume)
	set_bus_volume("SFX", audio.sfx_volume)

func set_bus_volume(bus_name: String, volume_linear: float):
	var bus_idx = AudioServer.get_bus_index(bus_name)
	if bus_idx != -1:
		AudioServer.set_bus_volume_db(bus_idx, linear_to_db(volume_linear))
		AudioServer.set_bus_mute(bus_idx, volume_linear <= 0.001)

func set_control(action_name: String, keycode: int):
	if settings.controls.has(action_name):
		settings.controls[action_name] = keycode
		emit_signal("control_remapped", action_name, keycode)
		save_settings()

func get_control_keycode(action_name: String) -> int:
	return settings.controls.get(action_name, -1)

func get_control_text(action_name: String) -> String:
	var code = get_control_keycode(action_name)
	if code == -1: return "Unbound"
	return OS.get_keycode_string(code)