class_name ControlsEditor
extends PanelContainer

var ui: GameUI
var settings_path := ControlBindings.PATH
var rows := VBoxContainer.new()
var notice := Label.new()
var pending_action := ""
var pending_slot := 0
var candidate: Dictionary = {}
var swap_button := Button.new()

func _ready() -> void:
	set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	var background := StyleBoxFlat.new()
	background.bg_color = Color("101d26")
	add_theme_stylebox_override("panel", background)
	var margin := MarginContainer.new()
	for side: String in ["left", "right", "top", "bottom"]: margin.add_theme_constant_override("margin_" + side, 24)
	add_child(margin)
	var column := VBoxContainer.new()
	column.add_theme_constant_override("separation", 12)
	margin.add_child(column)
	var heading := Label.new()
	heading.text = "STEUERUNG / TASTENBELEGUNG"
	heading.add_theme_font_size_override("font_size", 28)
	column.add_child(heading)
	notice.text = "Belegung anklicken, dann Taste oder Maustaste drücken. Esc bricht die Eingabe ab."
	notice.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	column.add_child(notice)
	swap_button.text = "BELEGUNGEN TAUSCHEN"
	swap_button.hide()
	swap_button.pressed.connect(func(): finish(true))
	column.add_child(swap_button)
	var scroll := ScrollContainer.new()
	scroll.size_flags_vertical = Control.SIZE_EXPAND_FILL
	column.add_child(scroll)
	rows.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	scroll.add_child(rows)
	rebuild()
	var footer := HBoxContainer.new()
	column.add_child(footer)
	var reset := Button.new()
	reset.text = "STANDARD WIEDERHERSTELLEN"
	reset.pressed.connect(func():
		pending_action = ""
		swap_button.hide()
		ControlBindings.defaults()
		persist()
		rebuild())
	footer.add_child(reset)
	var back := Button.new()
	back.text = "← ZURÜCK"
	back.pressed.connect(ui.settings_menu)
	footer.add_child(back)

func rebuild() -> void:
	for child in rows.get_children():
		rows.remove_child(child)
		child.queue_free()
	for index in ControlBindings.ACTIONS.size():
		var action: String = ControlBindings.ACTIONS[index]
		var row := HBoxContainer.new()
		rows.add_child(row)
		var label := Label.new()
		label.text = ControlBindings.LABELS[index]
		label.custom_minimum_size.x = 300
		label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		row.add_child(label)
		for slot in 2:
			var button := Button.new()
			button.text = ControlBindings.label(ControlBindings.bindings[action][slot])
			button.custom_minimum_size = Vector2(180, 40)
			button.pressed.connect(func():
				pending_action = action
				pending_slot = slot
				candidate = {}
				swap_button.hide()
				notice.text = "%s: neue Taste / Maustaste drücken … (Esc: abbrechen)" % ControlBindings.LABELS[index])
			row.add_child(button)
			var clear := Button.new()
			clear.text = "×"
			clear.tooltip_text = "Diese Belegung entfernen"
			clear.pressed.connect(func():
				pending_action = ""
				swap_button.hide()
				if ControlBindings.assign(action, slot, {}):
					persist()
					rebuild()
				else: notice.text = "Für das Menü muss mindestens eine Taste belegt bleiben.")
			row.add_child(clear)

func _input(event: InputEvent) -> void:
	if pending_action.is_empty(): return
	if not (event is InputEventKey or event is InputEventMouseButton): return
	if not event.is_pressed() or event.is_echo(): return
	# A pending conflict has explicit buttons; don't capture their mouse clicks.
	if swap_button.visible:
		if event is InputEventKey and event.keycode == KEY_ESCAPE:
			pending_action = ""
			swap_button.hide()
			notice.text = "Abgebrochen. Die bisherigen Belegungen bleiben bestehen."
			get_viewport().set_input_as_handled()
		return
	get_viewport().set_input_as_handled()
	if event is InputEventKey and event.keycode == KEY_ESCAPE:
		pending_action = ""
		notice.text = "Eingabe abgebrochen."
		return
	candidate = ControlBindings.encode(event)
	if candidate.is_empty(): return
	var conflicts := ControlBindings.conflicts(pending_action, pending_slot, candidate)
	if not conflicts.is_empty():
		var names := PackedStringArray()
		for conflict in conflicts: names.append(ControlBindings.LABELS[ControlBindings.ACTIONS.find(conflict.action)])
		notice.text = "%s ist bereits belegt: %s. Tauschen oder mit Esc abbrechen." % [ControlBindings.label(candidate), ", ".join(names)]
		swap_button.show()
	else: finish(false)

func finish(swap: bool) -> void:
	if ControlBindings.assign(pending_action, pending_slot, candidate, swap):
		persist()
	else:
		notice.text = "Diese Belegung ist nicht möglich: gehaltene Aktionen brauchen eine Taste / Maustaste; das Menü muss erreichbar bleiben."
	pending_action = ""
	swap_button.hide()
	rebuild()

func persist() -> void:
	notice.text = "Gespeichert. Die Steuerung ist sofort aktiv." if ControlBindings.save(settings_path) == OK else "Speichern fehlgeschlagen. Die Änderung ist nur für diese Sitzung aktiv."