extends Node

# Autoload: persisted player-facing video preferences (AA, glow, brightness).
# AA is a Viewport-wide setting applied immediately via apply_aa(). Glow and
# brightness instead scale each arena's own tuned Environment values (see
# arena.gd's _ready(), which calls apply_to_environment() once per arena
# load) rather than overwriting them outright, so the per-arena bloom tuning
# in arena_01/02/03.tscn survives underneath the user's preference.

enum AAMode { OFF, FXAA, MSAA, MSAA_FXAA }

const SETTINGS_PATH := "user://settings.cfg"

var aa_mode: AAMode = AAMode.MSAA_FXAA
var glow_scale: float = 1.0
var brightness: float = 1.0


func _ready() -> void:
	_load()
	apply_aa()


func _load() -> void:
	var cfg := ConfigFile.new()
	if cfg.load(SETTINGS_PATH) != OK:
		return
	aa_mode = cfg.get_value("video", "aa_mode", aa_mode) as AAMode
	glow_scale = cfg.get_value("video", "glow_scale", glow_scale)
	brightness = cfg.get_value("video", "brightness", brightness)


func save() -> void:
	var cfg := ConfigFile.new()
	cfg.set_value("video", "aa_mode", aa_mode)
	cfg.set_value("video", "glow_scale", glow_scale)
	cfg.set_value("video", "brightness", brightness)
	cfg.save(SETTINGS_PATH)


func apply_aa() -> void:
	var viewport := get_tree().root
	match aa_mode:
		AAMode.OFF:
			viewport.msaa_3d = Viewport.MSAA_DISABLED
			viewport.screen_space_aa = Viewport.SCREEN_SPACE_AA_DISABLED
		AAMode.FXAA:
			viewport.msaa_3d = Viewport.MSAA_DISABLED
			viewport.screen_space_aa = Viewport.SCREEN_SPACE_AA_FXAA
		AAMode.MSAA:
			viewport.msaa_3d = Viewport.MSAA_4X
			viewport.screen_space_aa = Viewport.SCREEN_SPACE_AA_DISABLED
		AAMode.MSAA_FXAA:
			viewport.msaa_3d = Viewport.MSAA_4X
			viewport.screen_space_aa = Viewport.SCREEN_SPACE_AA_FXAA


# Called once by each arena's _ready() to fold the user's glow/brightness
# preference into that arena's own baked Environment tuning.
func apply_to_environment(env: Environment) -> void:
	if env == null:
		return
	env.glow_enabled = glow_scale > 0.0
	env.glow_intensity *= glow_scale
	env.adjustment_brightness *= brightness