extends SceneTree
## Regression/smoke test for the PC2 "Enter World" flow end to end.
##
## Real user path: register -> land on world_list.tscn -> click "Enter World"
## on a real card -> the playable level (scenes/game.tscn) actually loads
## with the player spawned in it -> pressing Escape returns to world_list.
##
## Run with:
##     godot --headless --path . --script res://scripts/smoke_test_enter_world.gd
##
## Requires the backend to be running (default base URL
## `application/agp/api_base_url` -> http://127.0.0.1:8000, overridable via
## AGP_API_BASE_URL) and at least one real world to already exist.

var passed := 0
var failed := 0


func _initialize() -> void:
	_run()


func _run() -> void:
	await process_frame

	var api := root.get_node("ApiClient")
	if api == null:
		printerr("FAIL: ApiClient autoload not found")
		quit(1)
		return

	# 1. Register a real user and seed a world so the browse list has a
	# real card to click, same pattern as smoke_test_world_list.gd.
	randomize()
	var unique_id: int = int(Time.get_unix_time_from_system() * 1000) + randi() % 100000
	var username := "enterworld_%d" % unique_id
	var email := "enterworld_%d@test.example.com" % unique_id
	var reg_result: Dictionary = await api.register(username, email, "SmokeTest123!", "1990-01-01")
	if not _check("setup: register succeeded", reg_result.ok):
		print("  detail: ", reg_result.detail)
		_finish()
		return

	var world_body := JSON.stringify({
		"name": "EnterWorld Smoke Test World %d" % unique_id,
		"description": "Seeded by smoke_test_enter_world.gd",
		"visibility": "public",
	})
	var world_result: Dictionary = await api.request(
		HTTPClient.METHOD_POST, "/api/worlds/", world_body, "application/json", true
	)
	if not _check("setup: world created", world_result.ok):
		print("  detail: ", world_result.detail)
		_finish()
		return

	# 2. Load world_list.tscn as a real scene and let it fetch worlds.
	var packed: PackedScene = load("res://scenes/world_list.tscn")
	var instance: Control = packed.instantiate()
	root.add_child(instance)
	# _ready() kicks off an async _refresh_worlds() -- wait real frames for
	# the HTTP round trip rather than guessing a fixed count.
	var world_list_node: VBoxContainer = instance.get_node("VBoxContainer/ScrollContainer/WorldList")
	var settled := false
	for i in 120:
		await process_frame
		if world_list_node.get_child_count() > 0:
			settled = true
			break
	if not _check("world list populated with at least one card", settled):
		_finish()
		return

	# 3. Click "Enter World" on the first real card -- find the button by
	# walking the card's children rather than assuming an index, so this
	# doesn't silently pass if _create_world_card's structure changes.
	var card: Control = world_list_node.get_child(0)
	var enter_button: Button = _find_button(card, "Enter World")
	if not _check("Enter World button exists on the card", enter_button != null):
		_finish()
		return

	enter_button.pressed.emit()
	await _wait_for_scene_change(instance, 60)

	var game_scene := current_scene
	if not _check("game.tscn became current_scene after Enter World", game_scene != null and game_scene != instance):
		_finish()
		return

	# 4. Verify the player actually exists and spawned at the level's
	# PlayerSpawn marker -- not just that *some* scene loaded.
	var player: Node = game_scene.get_node_or_null("Player")
	_check("Player node exists in the loaded game scene", player is CharacterBody3D)

	var spawn_marker: Node = game_scene.get_node_or_null("Level/PlayerSpawn")
	_check("PlayerSpawn marker exists in the loaded level", spawn_marker is Marker3D)

	if player is CharacterBody3D and spawn_marker is Marker3D:
		var dist := (player as CharacterBody3D).global_position.distance_to((spawn_marker as Marker3D).global_position)
		_check("player spawned at (or very near) the PlayerSpawn marker", dist < 0.5)

	# 5. Escape should return to world_list.tscn (real key event, not a
	# direct method call -- proves the actual input binding works).
	var esc_event := InputEventKey.new()
	esc_event.keycode = KEY_ESCAPE
	esc_event.pressed = true
	Input.parse_input_event(esc_event)
	await _wait_for_scene_change(game_scene, 60)

	var back_to_menu := current_scene
	_check("Escape returned to world_list.tscn", back_to_menu != null and back_to_menu.scene_file_path == "res://scenes/world_list.tscn")

	_finish()


func _find_button(node: Node, text: String) -> Button:
	if node is Button and (node as Button).text == text:
		return node
	for child in node.get_children():
		var found := _find_button(child, text)
		if found:
			return found
	return null


func _wait_for_scene_change(previous_scene: Node, max_frames: int) -> void:
	for i in max_frames:
		await process_frame
		if current_scene != previous_scene and current_scene != null:
			return


func _check(description: String, condition: bool) -> bool:
	if condition:
		print("  PASS: ", description)
		passed += 1
	else:
		printerr("  FAIL: ", description)
		failed += 1
	return condition


func _finish() -> void:
	print("\n=== SMOKE RESULT: %d/%d passed ===" % [passed, passed + failed])
	quit(0 if failed == 0 else 1)