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
		"move_up": KEY_W,
		"move_up_alt": KEY_UP,
		"move_down": KEY_S,
		"move_down_alt": KEY_DOWN,
		"move_left": KEY_A,
		"move_left_alt": KEY_LEFT,
		"move_right": KEY_D,
		"move_right_alt": KEY_RIGHT,
		
		# Actions
		"grab": KEY_SPACE,
		"grab_alt": KEY_J,
		"tekton_grab": KEY_G,
		"tekton_grab_alt": KEY_L,
		
		# Power-Up Controls
		"use_powerup": KEY_F,
		"use_powerup_alt": KEY_SHIFT,
		
		# Power Bar Controls / Special
		"attack_mode": KEY_Q,
		"attack_mode_alt": KEY_U,
		
		# Controller Button Bindings (JOY_BUTTON_* indices)
		"ctrl_grab": JOY_BUTTON_A,
		"ctrl_tekton_grab": JOY_BUTTON_RIGHT_SHOULDER,
		"ctrl_use_powerup": JOY_BUTTON_Y,
		"ctrl_attack_mode": JOY_BUTTON_X
	}
}

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.")
	
	# Remove deprecated keys that may persist in old saved configs
	var deprecated_keys = ["put", "put_alt"]
	for k in deprecated_keys:
		if settings.controls.has(k):
			settings.controls.erase(k)
			print("[Settings] Removed deprecated control: ", k)


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()
	apply_control_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
	print("[SettingsManager] Applying audio settings: ", audio)
	set_bus_volume("Master", audio.master_volume)
	set_bus_volume("Music", audio.music_volume)
	set_bus_volume("SFX", audio.sfx_volume)
	
	# Explicitly ensure Music and SFX are routed to Master if they exist
	var master_idx = AudioServer.get_bus_index("Master")
	if master_idx != -1:
		var music_idx = AudioServer.get_bus_index("Music")
		if music_idx != -1: AudioServer.set_bus_send(music_idx, "Master")
		var sfx_idx = AudioServer.get_bus_index("SFX")
		if sfx_idx != -1: AudioServer.set_bus_send(sfx_idx, "Master")

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 apply_control_settings():
	# Sync custom settings with InputMap
	var mapping = {
		"move_up": "move_north",
		"move_down": "move_south",
		"move_left": "move_west",
		"move_right": "move_east",
		"grab": "action_grab",
		"use_powerup": "use_powerup",
		"tekton_grab": "action_grab_tekton",
		"attack_mode": "action_knock_tekton"
	}
	
	for setting_key in mapping.keys():
		var action_name = mapping[setting_key]
		if not InputMap.has_action(action_name):
			InputMap.add_action(action_name)
			
		InputMap.action_erase_events(action_name)
		
		# Add Primary
		var primary_key = settings.controls.get(setting_key)
		if primary_key:
			var event = InputEventKey.new()
			event.keycode = primary_key
			InputMap.action_add_event(action_name, event)
			
		# Add Secondary
		var secondary_key = settings.controls.get(setting_key + "_alt")
		if secondary_key:
			var event = InputEventKey.new()
			event.keycode = secondary_key
			InputMap.action_add_event(action_name, event)
			
		# Add Joypad defaults for actions - use saved ctrl_* bindings
		var joy_button_mapped = -1
		match action_name:
			"action_grab": joy_button_mapped = settings.controls.get("ctrl_grab", JOY_BUTTON_A)
			"use_powerup": joy_button_mapped = settings.controls.get("ctrl_use_powerup", JOY_BUTTON_Y)
			"action_grab_tekton": joy_button_mapped = settings.controls.get("ctrl_tekton_grab", JOY_BUTTON_RIGHT_SHOULDER)
			"action_knock_tekton": joy_button_mapped = settings.controls.get("ctrl_attack_mode", JOY_BUTTON_X)
		
		if action_name == "action_put": joy_button_mapped = JOY_BUTTON_B
		
		if joy_button_mapped != -1:
			var joy_btn_event = InputEventJoypadButton.new()
			joy_btn_event.button_index = joy_button_mapped
			InputMap.action_add_event(action_name, joy_btn_event)
			
		# Add Joypad defaults for movement
		if action_name.begins_with("move_"):
			var joy_axis = -1
			var axis_val = 0.0
			match action_name:
				"move_north": joy_axis = JOY_AXIS_LEFT_Y; axis_val = -1.0
				"move_south": joy_axis = JOY_AXIS_LEFT_Y; axis_val = 1.0
				"move_west": joy_axis = JOY_AXIS_LEFT_X; axis_val = -1.0
				"move_east": joy_axis = JOY_AXIS_LEFT_X; axis_val = 1.0
			
			if joy_axis != -1:
				var joy_event = InputEventJoypadMotion.new()
				joy_event.axis = joy_axis
				joy_event.axis_value = axis_val
				InputMap.action_add_event(action_name, joy_event)

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

# --- Controller Binding ---

# Godot 4 JoyButton name map (var not const — enum keys can't be used in const dicts)
var CTRL_BUTTON_NAMES: Dictionary = {
	JOY_BUTTON_A: "A / Cross",
	JOY_BUTTON_B: "B / Circle",
	JOY_BUTTON_X: "X / Square",
	JOY_BUTTON_Y: "Y / Triangle",
	JOY_BUTTON_LEFT_SHOULDER: "LB / L1",
	JOY_BUTTON_RIGHT_SHOULDER: "RB / R1",
	JOY_BUTTON_LEFT_STICK: "L3",
	JOY_BUTTON_RIGHT_STICK: "R3",
	JOY_BUTTON_BACK: "Select / Share",
	JOY_BUTTON_START: "Start / Options",
	JOY_BUTTON_DPAD_UP: "D-Up",
	JOY_BUTTON_DPAD_DOWN: "D-Down",
	JOY_BUTTON_DPAD_LEFT: "D-Left",
	JOY_BUTTON_DPAD_RIGHT: "D-Right",
}

func get_joy_button_name(button_index: int) -> String:
	return CTRL_BUTTON_NAMES.get(button_index, "Btn %d" % button_index)

func get_controller_binding_text(ctrl_key: String) -> String:
	"""Return the button name for a ctrl_* settings key."""
	var idx = settings.controls.get(ctrl_key, -1)
	if idx == -1:
		return "Unbound"
	return get_joy_button_name(idx)

func get_action_display(action_key: String) -> String:
	"""Return keyboard text or controller button name based on use_controller setting."""
	if settings.controls.get("use_controller", false):
		# Map action key to its ctrl_* key
		var ctrl_key_map = {
			"grab": "ctrl_grab",
			"use_powerup": "ctrl_use_powerup",
			"tekton_grab": "ctrl_tekton_grab",
			"action_grab_tekton": "ctrl_tekton_grab",
			"attack_mode": "ctrl_attack_mode",
			"action_knock_tekton": "ctrl_attack_mode",
		}
		if ctrl_key_map.has(action_key):
			return get_controller_binding_text(ctrl_key_map[action_key])
		# Movement axes on left stick
		if action_key.begins_with("move_"):
			return "L-Stick"
		return get_control_text(action_key)
	return get_control_text(action_key)

func set_controller_binding(ctrl_key: String, button_index: int):
	"""Save a controller button binding and re-apply input maps."""
	if settings.controls.has(ctrl_key):
		settings.controls[ctrl_key] = button_index
		apply_control_settings()
		emit_signal("control_remapped", ctrl_key, button_index)
		save_settings()

func is_controller_button_used(button_index: int) -> String:
	"""Check if a controller button is already assigned."""
	for key in settings.controls.keys():
		if key.begins_with("ctrl_") and settings.controls[key] == button_index:
			return key
	return ""

func get_control_keycode(action_name: String) -> int:
	# settings.controls stores keys by the same name callers pass in
	# (e.g. "tekton_grab", "attack_mode", "grab"). The InputMap action name
	# (e.g. "action_grab_tekton") is a separate concept handled by
	# apply_control_settings(). Do NOT remap here.
	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)

func is_key_used(keycode: int) -> String:
	"""Check if a keycode is already assigned to any action."""
	for action in settings.controls.keys():
		if action == "use_controller": continue
		if settings.controls[action] == keycode:
			return action
	return ""