extends Node
class_name LayoutManager
## Manages saved dashboard layouts.
##
## Layouts map tile_id -> {col, row, w, h}. The current layout is loaded
## on startup and auto-saved when modules are placed or resized.
## Supports multiple named layouts with a simple file-per-layout scheme.


signal layout_changed(layout_name: String)
signal layout_saved(layout_name: String)
signal layout_loaded(layout_name: String)

const LAYOUT_DIR: String = "res://config/layouts/"

## Current layout name (e.g. "default").
var current_layout_name: String = "default"

## The active layout data: tile_id -> {col, row, w, h}
var _layout: Dictionary = {}


func _ready() -> void:
	if not DirAccess.dir_exists_absolute(LAYOUT_DIR):
		DirAccess.make_dir_recursive_absolute(LAYOUT_DIR)

	var configured_name: String = _get_configured_layout()
	if not configured_name.is_empty():
		current_layout_name = configured_name

	if not load_layout(current_layout_name):
		current_layout_name = "default"
		_layout.clear()


## Return the layout name from config, or empty.
func _get_configured_layout() -> String:
	if ConfigManager.has_method("get_setting"):
		var val: Variant = ConfigManager.get_setting("layout_current", "")
		if val is String and not val.is_empty():
			return val
	return ""


## Set the current layout name (does not load or save).
func set_current_layout(name: String) -> void:
	current_layout_name = name
	if ConfigManager.has_method("set_setting"):
		ConfigManager.set_setting("layout_current", name)
	layout_changed.emit(name)


## Get tile_id -> {col, row, w, h} for the current layout.
func get_layout() -> Dictionary:
	return _layout.duplicate(true)


## Set a single tile's position in the current layout.
func set_tile_position(tile_id: String, col: int, row: int, w: int, h: int) -> void:
	_layout[tile_id] = {col = col, row = row, w = w, h = h}


## Remove a tile from the current layout.
func remove_tile(tile_id: String) -> void:
	_layout.erase(tile_id)


## Save the current layout to config/layouts/{name}.cfg
func save_layout(name: String = "") -> void:
	if name.is_empty():
		name = current_layout_name

	var cfg := ConfigFile.new()
	cfg.set_value("layout", "name", name)
	cfg.set_value("layout", "saved_at", Time.get_datetime_string_from_system())

	var tile_ids: Array = _layout.keys()
	cfg.set_value("tiles", "count", tile_ids.size())
	for i in tile_ids.size():
		var tid: String = tile_ids[i] as String
		var entry: Dictionary = _layout[tid]
		var section := "tile_%d" % i
		cfg.set_value(section, "id", tid)
		cfg.set_value(section, "col", entry.get("col", 0))
		cfg.set_value(section, "row", entry.get("row", 0))
		cfg.set_value(section, "w", entry.get("w", 1))
		cfg.set_value(section, "h", entry.get("h", 1))

	var path := LAYOUT_DIR.path_join(name + ".cfg")
	var result := cfg.save(path)
	if result == OK:
		current_layout_name = name
		layout_saved.emit(name)


## Load a saved layout, replacing the current in-memory layout.
## Returns true if the file existed and was parsed.
func load_layout(name: String) -> bool:
	var path := LAYOUT_DIR.path_join(name + ".cfg")
	if not FileAccess.file_exists(path):
		return false

	var cfg := ConfigFile.new()
	if cfg.load(path) != OK:
		return false

	_layout.clear()
	current_layout_name = name

	var tile_count: int = cfg.get_value("tiles", "count", 0)
	for i in range(tile_count):
		var section := "tile_%d" % i
		var tid: String = cfg.get_value(section, "id", "")
		if tid.is_empty():
			continue
		_layout[tid] = {
			col = cfg.get_value(section, "col", 0),
			row = cfg.get_value(section, "row", 0),
			w = cfg.get_value(section, "w", 1),
			h = cfg.get_value(section, "h", 1),
		}

	layout_loaded.emit(name)
	return true


## Get a list of all saved layout names.
func get_layout_names() -> PackedStringArray:
	var dir := DirAccess.open(LAYOUT_DIR)
	if dir == null:
		return PackedStringArray()

	var names: PackedStringArray = []
	dir.list_dir_begin()
	var entry: String = dir.get_next()
	while entry != "":
		if entry.ends_with(".cfg") and not entry.begins_with("."):
			names.append(entry.trim_suffix(".cfg"))
		entry = dir.get_next()
	dir.list_dir_end()
	return names


## Switch to a different layout: saves current, loads new, emits signal.
func switch_layout(name: String) -> void:
	if name == current_layout_name:
		return
	save_layout(current_layout_name)
	load_layout(name)
	set_current_layout(name)