extends SceneTree

var failures: Array[String] = []


func _init() -> void:
	_run.call_deferred()


func _run() -> void:
	_check_energy_bar_scene_has_editor_segments()

	var scene: PackedScene = load("res://scenes/ui/main_ui.tscn")
	if scene == null:
		push_error("Could not load main_ui.tscn")
		quit(1)
		return

	var ui := scene.instantiate()
	root.add_child(ui)
	await process_frame

	_expect_node(ui, "RhythmTrack", "UI should include RhythmTrack")
	_expect_node(ui, "ComboWindow", "UI should include ComboWindow")
	_expect_node(ui, "StatusBars/HealthBar", "UI should include HealthBar")
	_expect_node(ui, "StatusBars/EnergyBar", "UI should include EnergyBar")
	_expect_node(ui, "StatusBars/ChargeBar", "UI should include ChargeBar")

	var combo_window := ui.get_node("ComboWindow")
	_expect_bool(combo_window.get_child_count() >= 4, true, "ComboWindowHud should build four visual slots")

	var bus := _event_bus()
	bus.emit_signal("player_health_changed", 42, 100)
	bus.emit_signal("player_energy_changed", 3.0, 10.0)
	bus.emit_signal("player_charge_changed", 0.8, 1.1, false, true)
	bus.emit_signal("combo_updated", [&"A", &"SP"])
	await process_frame

	var health_bar := ui.get_node("StatusBars/HealthBar") as ProgressBar
	var charge_bar := ui.get_node("StatusBars/ChargeBar") as ProgressBar
	_expect_float(float(health_bar.value), 42.0, "HealthBar should follow EventBus health")
	_expect_float(float(charge_bar.value), 0.8, "ChargeBar should follow EventBus charge")

	ui.free()
	_finish()


func _check_energy_bar_scene_has_editor_segments() -> void:
	var scene: PackedScene = load("res://scenes/ui/energy_bar.tscn")
	if scene == null:
		failures.append("Could not load energy_bar.tscn")
		return
	var energy_bar := scene.instantiate()
	_expect_bool(energy_bar.get_child_count() == 10, true, "EnergyBar scene should contain ten editor-visible segments before _ready")
	energy_bar.free()


func _event_bus() -> Node:
	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


func _expect_node(node: Node, path: String, label: String) -> void:
	if node.get_node_or_null(path) == null:
		failures.append(label)


func _expect_bool(actual: bool, expected: bool, label: String) -> void:
	if actual != expected:
		failures.append("%s: expected %s, got %s" % [label, expected, actual])


func _expect_float(actual: float, expected: float, label: String) -> void:
	if not is_equal_approx(actual, expected):
		failures.append("%s: expected %.3f, got %.3f" % [label, expected, actual])


func _finish() -> void:
	if failures.is_empty():
		print("PASS combo hud")
		quit(0)
	else:
		for failure: String in failures:
			push_error(failure)
		quit(1)