class_name ComboWindowHud
extends HBoxContainer

@export var slot_count := 4

var panels: Array[PanelContainer] = []
var labels: Array[Label] = []
var clear_tween: Tween


func _ready() -> void:
	_build_slots()
	var bus := _event_bus()
	bus.connect("combo_updated", refresh)
	bus.connect("combo_cleared", _on_combo_cleared)


func refresh(inputs: Array) -> void:
	if labels.is_empty():
		_build_slots()
	for index: int in range(labels.size()):
		var filled := index < inputs.size()
		labels[index].text = str(inputs[index]) if filled else "."
		labels[index].modulate = Color(1.0, 1.0, 1.0, 1.0 if filled else 0.35)
		panels[index].modulate = Color(1.0, 1.0, 1.0, 1.0 if filled else 0.48)
		if filled:
			_pulse_slot(panels[index])


func _on_combo_cleared(_reason: StringName) -> void:
	refresh([])
	_flash_clear()


func _build_slots() -> void:
	if not labels.is_empty():
		return
	for index: int in range(slot_count):
		var panel := PanelContainer.new()
		panel.custom_minimum_size = Vector2(64, 56)
		panel.pivot_offset = Vector2(32, 28)
		panel.modulate = Color(1.0, 1.0, 1.0, 0.48)
		panel.add_theme_stylebox_override("panel", _make_slot_style())
		var label := Label.new()
		label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
		label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
		label.text = "."
		label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		label.size_flags_vertical = Control.SIZE_EXPAND_FILL
		label.add_theme_color_override("font_color", Color(0.94, 0.98, 1.0, 1.0))
		label.add_theme_color_override("font_shadow_color", Color(0.0, 0.0, 0.0, 0.9))
		label.add_theme_constant_override("shadow_offset_x", 2)
		label.add_theme_constant_override("shadow_offset_y", 2)
		label.add_theme_font_size_override("font_size", 26)
		panel.add_child(label)
		add_child(panel)
		panels.append(panel)
		labels.append(label)


func _pulse_slot(panel: PanelContainer) -> void:
	var tween := create_tween()
	panel.scale = Vector2(1.08, 1.08)
	tween.tween_property(panel, "scale", Vector2.ONE, 0.09)


func _flash_clear() -> void:
	if clear_tween != null and clear_tween.is_valid():
		clear_tween.kill()
	clear_tween = create_tween()
	clear_tween.set_parallel(true)
	for panel: PanelContainer in panels:
		panel.scale = Vector2(1.16, 1.16)
		panel.modulate = Color(1.0, 1.0, 1.0, 1.0)
		clear_tween.tween_property(panel, "scale", Vector2.ONE, 0.20)
		clear_tween.tween_property(panel, "modulate", Color(1.0, 1.0, 1.0, 0.48), 0.20)


func _make_slot_style() -> StyleBoxFlat:
	var style := StyleBoxFlat.new()
	style.content_margin_left = 6.0
	style.content_margin_top = 4.0
	style.content_margin_right = 6.0
	style.content_margin_bottom = 4.0
	style.bg_color = Color(0.04, 0.07, 0.09, 0.82)
	style.border_width_left = 2
	style.border_width_top = 2
	style.border_width_right = 2
	style.border_width_bottom = 2
	style.border_color = Color(0.43, 0.78, 0.88, 0.95)
	style.corner_radius_top_left = 6
	style.corner_radius_top_right = 6
	style.corner_radius_bottom_right = 6
	style.corner_radius_bottom_left = 6
	return style


func _event_bus() -> Node:
	var root := get_tree().root
	var bus := root.get_node_or_null("EventBus")
	if bus == null:
		bus = load("res://autoload/event_bus.gd").new()
		bus.name = "EventBus"
		root.add_child(bus)
	return bus