extends SceneTree
## Headless smoke test for the world list screen.
##
## Run with:
##     godot --headless --path . --script res://scripts/smoke_test_world_list.gd
##
## Requires the backend to be running (default base URL
## `application/agp/api_base_url` -> http://127.0.0.1:8000, override with
## AGP_API_BASE_URL).
##
## Unlike a pure API-level test, this actually instantiates scenes/
## world_list.tscn as a real scene and adds it to the tree -- catches
## @onready node-path bugs (a node reference pointing at the wrong path
## errors right here, not just "looks right" from reading the script) that
## an API-only test would miss entirely.
##
## Tests:
##   1. Register + log in a fresh user (so get_worlds() has a valid token).
##   2. POST a real world via the API so the populated-card path actually
##      gets exercised -- run_checkpoint_tests.py always starts from a
##      genuinely empty DB, so without this the card-rendering code below
##      would never run in CI at all, only the empty-list path would.
##   3. Instantiate world_list.tscn, add to tree -- @onready resolution
##      must not error.
##   4. Wait for _refresh_worlds()'s awaited request to complete.
##   5. Confirm it actually reached the populated (not empty) state, and
##      that the rendered card has a real width -- not just non-zero
##      child_count. 2026-08-20: a real bug shipped where every card
##      technically existed in the tree (child_count > 0, no error, no
##      crash) but rendered at 1.0px wide because size_flags_horizontal/
##      vertical used the raw integer 4 (Control.SIZE_SHRINK_CENTER)
##      instead of 3 (Control.SIZE_EXPAND_FILL) on ScrollContainer -- a
##      child-count check alone would never catch that, only a real size
##      assertion does.
##
## Exits 0 on full pass, 1 on any failure.

const WORLD_LIST_SCENE := "res://scenes/world_list.tscn"
const MIN_SANE_CARD_WIDTH := 200.0  # a real screen is at minimum a few hundred px wide


func _initialize() -> void:
	_run()


func _run() -> void:
	await process_frame

	var api := root.get_node("ApiClient")
	assert(api != null, "ApiClient autoload not found")

	var passed: int = 0
	var failed: int = 0

	# --- Setup: register + log in so the world list has a valid token ---
	print("\n=== Setup: register + login ===")
	randomize()
	var unique_id: int = int(Time.get_unix_time_from_system() * 1000) + randi() % 100000
	var username := "worldlist_smoke_%d" % unique_id
	var email := "worldlist_smoke_%d@test.example.com" % unique_id
	var reg_result: Dictionary = await api.register(username, email, "SmokeTest123!", true)
	if not _check("setup: register succeeded", reg_result.ok):
		print("  detail: ", reg_result.detail)
		quit(1)
		return

	# --- Seed a real world so the populated-card path is actually exercised ---
	print("\n=== Setup: seed a real world ===")
	var world_body := JSON.stringify({
		"name": "Smoke Test World %d" % unique_id,
		"description": "Seeded by smoke_test_world_list.gd to exercise the populated-card render path.",
		"visibility": "public",
	})
	var create_result: Dictionary = await api.request(HTTPClient.METHOD_POST, "/api/worlds/", world_body, "application/json", true)
	if not _check("setup: world created", create_result.ok):
		print("  detail: ", create_result.detail)
		quit(1)
		return

	# --- Test 1: Instantiate the real scene ---
	print("\n=== Test 1: Instantiate world_list.tscn ===")
	var packed_scene: PackedScene = load(WORLD_LIST_SCENE)
	if not _check("scene loads", packed_scene != null):
		quit(1)
		return

	var instance: Control = packed_scene.instantiate()
	if not _check("scene instantiates", instance != null):
		quit(1)
		return

	root.add_child(instance)
	# One frame for _ready() (and its @onready resolution) to run. A wrong
	# node path in an @onready var errors during this, not silently.
	await process_frame

	if _check("scene added to tree without error", is_instance_valid(instance)):
		passed += 1
	else:
		failed += 1

	# --- Test 2: Wait for the world fetch to resolve, check a real end state ---
	print("\n=== Test 2: World fetch reaches a real end state ===")
	# _refresh_worlds() runs from _ready(); give its awaited HTTP call time
	# to complete rather than a fixed sleep -- poll for either end state.
	var world_list_node: VBoxContainer = instance.get_node("VBoxContainer/ScrollContainer/WorldList")
	var empty_label: Label = instance.get_node("VBoxContainer/EmptyLabel")
	var error_label: Label = instance.get_node("VBoxContainer/ErrorLabel")

	var settled := false
	for i in range(50):  # up to ~5s at 100ms/frame-ish via process_frame waits
		await process_frame
		if world_list_node.visible or empty_label.visible or error_label.visible:
			settled = true
			break

	if _check("reached a real end state (cards, empty, or error) not stuck loading", settled):
		passed += 1
	else:
		failed += 1
		print("  world_list.visible=%s empty_label.visible=%s error_label.visible=%s" % [
			world_list_node.visible, empty_label.visible, error_label.visible
		])

	if error_label.visible:
		printerr("  Note: ended in error state: ", error_label.text)
	elif empty_label.visible:
		# We just seeded a world -- ending up empty means GET /api/worlds
		# isn't actually seeing what POST /api/worlds/ just created.
		_check("ended in populated state, not empty (a world was just seeded)", false)
		failed += 1
	elif world_list_node.visible:
		var card_count := world_list_node.get_child_count()
		print("  Note: rendered %d world card(s)" % card_count)

		if _check("at least one card rendered", card_count > 0):
			passed += 1
		else:
			failed += 1

		# The actual bug this test exists to catch: a card can be present
		# in the tree, not crash, and still be visually nothing because
		# it rendered at ~1px wide. Check every card's real computed size,
		# not just that it exists.
		for i in range(card_count):
			var card: Control = world_list_node.get_child(i)
			var wide_enough := card.size.x >= MIN_SANE_CARD_WIDTH
			if _check("card %d has a real width (%.0fpx >= %.0fpx)" % [i, card.size.x, MIN_SANE_CARD_WIDTH], wide_enough):
				passed += 1
			else:
				failed += 1

	# --- Summary ---
	print("\n=== SMOKE RESULT: %d/%d passed ===" % [passed, passed + failed])
	if failed > 0:
		quit(1)
	else:
		print("SMOKE RESULT: ALL PASS")
		quit(0)


func _check(description: String, condition: bool) -> bool:
	if condition:
		print("  PASS: ", description)
		return true
	else:
		printerr("  FAIL: ", description)
		return false