extends Node

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

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

const RESOLUTIONS = [
	Vector2i(1024, 576),
	Vector2i(1280, 720),
	Vector2i(1366, 768),
	Vector2i(1600, 900),
	Vector2i(1920, 1080),
	Vector2i(2560, 1440)
]

# Default values
var settings = {
	"video": {
		"fullscreen": true,
		"vsync": true,
		"resolution_idx": 1,
		"msaa": 0,           # 0: Disabled, 1: 2x, 2: 4x, 3: 8x
		"shadow_quality": 2, # 0: Low, 1: Med, 2: High, 3: Ultra
		"fps_cap": 2         # 0: Unlimited, 1: 30, 2: 60, 3: 120, 4: 144
	},
	"audio": {
		"master_volume": 0.8,
		"music_volume": 0.7,
		"sfx_volume": 0.9
	},
	"controls": {
		"use_controller": false,
		# Movement (Keybinds are typically fixed to WASD/Arrows in Input Map, but we show them)
		"move_up": KEY_W,
		"move_down": KEY_S,
		"move_left": KEY_A,
		"move_right": KEY_D,
		# Actions
		"grab": KEY_SPACE,
		"put": KEY_R,
		"tekton_grab": KEY_G,
		# Power-Up Controls
		"powerup_1": KEY_1,
		"powerup_2": KEY_2,
		"powerup_3": KEY_3,
		"powerup_4": KEY_4,
		# Power Bar Controls / Special
		"attack_mode": KEY_Q,
		"spawn_boost": KEY_E
	}
}

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)
		
		# Apply resolution size when windowed
		var res_idx = video.resolution_idx
		if res_idx >= 0 and res_idx < RESOLUTIONS.size():
			var target_res = RESOLUTIONS[res_idx]
			DisplayServer.window_set_size(target_res)
			# Center window after resize
			var screen = DisplayServer.window_get_current_screen()
			var screen_rect = DisplayServer.screen_get_usable_rect(screen)
			var window_size = DisplayServer.window_get_size()
			DisplayServer.window_set_position(screen_rect.position + (screen_rect.size - window_size) / 2)
		
	if video.vsync:
		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED)
	else:
		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)

	# Apply MSAA
	var viewport = get_viewport()
	match video.msaa:
		0: viewport.msaa_3d = Viewport.MSAA_DISABLED
		1: viewport.msaa_3d = Viewport.MSAA_2X
		2: viewport.msaa_3d = Viewport.MSAA_4X
		3: viewport.msaa_3d = Viewport.MSAA_8X

	# Apply FPS Cap
	match video.fps_cap:
		0: Engine.max_fps = 0
		1: Engine.max_fps = 30
		2: Engine.max_fps = 60
		3: Engine.max_fps = 120
		4: Engine.max_fps = 144

	# Apply Shadow Quality (Simplified for Forward+)
	match video.shadow_quality:
		0: # Low
			RenderingServer.directional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_LOW)
			RenderingServer.positional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_LOW)
		1: # Medium
			RenderingServer.directional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_MEDIUM)
			RenderingServer.positional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_MEDIUM)
		2: # High
			RenderingServer.directional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_HIGH)
			RenderingServer.positional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_HIGH)
		3: # Ultra
			RenderingServer.directional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_ULTRA)
			RenderingServer.positional_soft_shadow_filter_set_quality(RenderingServer.SHADOW_QUALITY_SOFT_ULTRA)

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)