extends Control

## Offers a set of random modifiers each round as draggable pieces.
## Dropping one on the board applies it and consumes the whole set.

const SectorSwatch := preload("res://core/ui/sector_swatch.gd")

@export var drop_catcher: Control
@export var pieces_per_round := 3
@export var piece_size := Vector2(90, 110)
@export var spacing := 24.0
@export var bottom_margin := 30.0

var _pieces: Array[Control] = []


func _ready() -> void:
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	spawn_round()


func spawn_round() -> void:
	_clear_pieces()

	# ModRegistry is the autoload. (Was "ModifierCatalog" — renamed.)
	var choices: Array = ModRegistry.pick_random(pieces_per_round)
	if choices.is_empty():
		push_warning("ModifierTray: registry returned no modifiers.")
		return

	for mod in choices:
		var piece := Control.new()
		piece.set_script(SectorSwatch)
		piece.custom_minimum_size = piece_size
		piece.size = piece_size
		piece.modifier = mod
		piece.paint_texture = mod.texture
		piece.drop_catcher = drop_catcher
		piece.tray = self
		add_child(piece)
		_pieces.append(piece)

	_layout_pieces()


func _layout_pieces() -> void:
	var count := _pieces.size()
	if count == 0:
		return

	var total_w := count * piece_size.x + (count - 1) * spacing
	var screen := get_viewport_rect().size
	var start_x := (screen.x - total_w) * 0.5
	var y := screen.y - piece_size.y - bottom_margin

	for i in count:
		_pieces[i].position = Vector2(start_x + i * (piece_size.x + spacing), y)


## Called by a piece when it lands successfully — the whole set is spent.
func consume() -> void:
	_clear_pieces()


func _clear_pieces() -> void:
	for p in _pieces:
		if is_instance_valid(p):
			p.queue_free()
	_pieces.clear()


# TESTING ONLY — SPACE rolls a new set.
func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventKey and event.pressed and event.keycode == KEY_SPACE:
		spawn_round()