extends Node
## Player-facing game options (autoload `Settings`), persisted to user://settings.cfg.
## Distinct from DP (debug tunables) and Controls (keybinds): this is the small set of
## comfort/accessibility toggles the options menu exposes to the player.

signal changed(key: String, value: Variant)

const SAVE_PATH := "user://settings.cfg"
const SECTION := "options"

## Master screen-shake toggle — gates every camera_iso.trigger_hit (hits and ability FX).
var screen_shake: bool = true
## Gore toggle — when off, no blood spawns (impact spurt + ongoing spear-wound bleed).
var gore: bool = true

## Audio volumes stored as linear 0–1. Applied to AudioServer buses on load/change.
var volume_master:  float = 1.0
var volume_ambient: float = 1.0
var volume_effects: float = 1.0
var mute_all:       bool  = false


func _ready() -> void:
	_ensure_buses()
	load_saved()


## Ensure Ambient and Effects buses exist as children of Master.
func _ensure_buses() -> void:
	for bus_name: String in ["Ambient", "Effects"]:
		if AudioServer.get_bus_index(bus_name) == -1:
			AudioServer.add_bus()
			var idx := AudioServer.bus_count - 1
			AudioServer.set_bus_name(idx, bus_name)
			AudioServer.set_bus_send(idx, &"Master")


func _apply_audio() -> void:
	AudioServer.set_bus_volume_db(AudioServer.get_bus_index("Master"),  _vol_db(volume_master))
	AudioServer.set_bus_volume_db(AudioServer.get_bus_index("Ambient"), _vol_db(volume_ambient))
	AudioServer.set_bus_volume_db(AudioServer.get_bus_index("Effects"), _vol_db(volume_effects))
	AudioServer.set_bus_mute(AudioServer.get_bus_index("Master"), mute_all)


func _vol_db(linear: float) -> float:
	return linear_to_db(maxf(linear, 0.0001))


func set_screen_shake(value: bool) -> void:
	if screen_shake == value:
		return
	screen_shake = value
	changed.emit("screen_shake", value)
	save()


func set_gore(value: bool) -> void:
	if gore == value:
		return
	gore = value
	changed.emit("gore", value)
	save()


func set_volume_master(value: float) -> void:
	volume_master = clampf(value, 0.0, 1.0)
	AudioServer.set_bus_volume_db(AudioServer.get_bus_index("Master"), _vol_db(volume_master))
	changed.emit("volume_master", volume_master)
	save()


func set_volume_ambient(value: float) -> void:
	volume_ambient = clampf(value, 0.0, 1.0)
	AudioServer.set_bus_volume_db(AudioServer.get_bus_index("Ambient"), _vol_db(volume_ambient))
	changed.emit("volume_ambient", volume_ambient)
	save()


func set_volume_effects(value: float) -> void:
	volume_effects = clampf(value, 0.0, 1.0)
	AudioServer.set_bus_volume_db(AudioServer.get_bus_index("Effects"), _vol_db(volume_effects))
	changed.emit("volume_effects", volume_effects)
	save()


func set_mute_all(value: bool) -> void:
	if mute_all == value:
		return
	mute_all = value
	AudioServer.set_bus_mute(AudioServer.get_bus_index("Master"), mute_all)
	changed.emit("mute_all", value)
	save()


func save() -> void:
	var cfg := ConfigFile.new()
	cfg.set_value(SECTION, "screen_shake",   screen_shake)
	cfg.set_value(SECTION, "gore",           gore)
	cfg.set_value(SECTION, "volume_master",  volume_master)
	cfg.set_value(SECTION, "volume_ambient", volume_ambient)
	cfg.set_value(SECTION, "volume_effects", volume_effects)
	cfg.set_value(SECTION, "mute_all",       mute_all)
	cfg.save(SAVE_PATH)


func load_saved() -> void:
	var cfg := ConfigFile.new()
	if cfg.load(SAVE_PATH) != OK:
		_apply_audio()
		return
	screen_shake   = cfg.get_value(SECTION, "screen_shake",   true)  as bool
	gore           = cfg.get_value(SECTION, "gore",           true)  as bool
	volume_master  = cfg.get_value(SECTION, "volume_master",  1.0)   as float
	volume_ambient = cfg.get_value(SECTION, "volume_ambient", 1.0)   as float
	volume_effects = cfg.get_value(SECTION, "volume_effects", 1.0)   as float
	mute_all       = cfg.get_value(SECTION, "mute_all",       false) as bool
	_apply_audio()