extends SceneTree
## Headless smoke test for the PC2 test level scene.
##
## Run with:
##     godot --headless --path . --script res://scripts/smoke_test_test_level.gd
##
## Loads the test level scene, asserts:
##   (a) it loads without error,
##   (b) it contains a Marker3D named "PlayerSpawn",
##   (c) PlayerSpawn is positioned >= 1.0 m above the ground top surface.
## Exits 0 on success, 1 on failure.


func _initialize() -> void:
	_run()


func _run() -> void:
	var level_path: String = "res://scenes/worlds/test_level.tscn"

	# Load the scene file
	var level_resource: PackedScene = load(level_path)
	if level_resource == null:
		printerr("SMOKE RESULT: FAIL \u2014 could not load ", level_path)
		quit(1)
		return

	print("SMOKE: test_level.tscn loaded successfully")

	# Change the running scene to our test level
	var err: int = change_scene_to_packed(level_resource)
	if err != OK:
		printerr("SMOKE RESULT: FAIL \u2014 change_scene_to_packed returned ", err)
		quit(1)
		return

	# Wait for the scene_changed signal so current_scene is set
	await scene_changed

	var level_instance: Node3D = current_scene as Node3D
	if level_instance == null:
		printerr("SMOKE RESULT: FAIL \u2014 current_scene is not Node3D")
		quit(1)
		return

	# Give the tree one frame to fully initialize
	await process_frame

	# (b) Find the PlayerSpawn marker
	var spawn_marker: Node3D = level_instance.find_child("PlayerSpawn", true, false) as Node3D
	if spawn_marker == null:
		printerr("SMOKE RESULT: FAIL \u2014 no Node3D named 'PlayerSpawn' found in test level")
		quit(1)
		return

	print("SMOKE: found PlayerSpawn at ", spawn_marker.global_position)

	# (c) Verify PlayerSpawn is >= 1.0 m above ground top
	# The ground top surface is at y = 0 (Ground StaticBody3D centered at y = -0.5
	# with height 1.0, so top face is at y = 0).
	var spawn_y: float = spawn_marker.global_position.y
	if spawn_y < 1.0:
		printerr("SMOKE RESULT: FAIL \u2014 PlayerSpawn y = ", spawn_y,
				 " is below the required minimum of 1.0 m above ground top (y=0)")
		quit(1)
		return

	print("SMOKE: PlayerSpawn y = ", spawn_y, " >= 1.0 m \u2014 PASS")

	# Additional check: verify Ground StaticBody3D exists
	var ground: StaticBody3D = level_instance.find_child("Ground", true, false) as StaticBody3D
	if ground == null:
		printerr("SMOKE RESULT: FAIL \u2014 no StaticBody3D named 'Ground' found")
		quit(1)
		return

	print("SMOKE: found Ground StaticBody3D")

	# Verify Ground top face is at y = 0
	var ground_shape: CollisionShape3D = ground.find_child("CollisionShape3D", true, false) as CollisionShape3D
	if ground_shape != null and ground_shape.shape is BoxShape3D:
		var box_shape: BoxShape3D = ground_shape.shape as BoxShape3D
		var ground_top: float = ground.global_position.y + box_shape.size.y / 2.0
		if abs(ground_top - 0.0) > 0.01:
			printerr("SMOKE RESULT: FAIL \u2014 Ground top face at y = ", ground_top, " expected ~0.0")
			quit(1)
			return
		print("SMOKE: Ground top face at y = ", ground_top, " \u2014 PASS")

	# Verify props exist (3-5 StaticBody3D children under Props node)
	var props_node: Node3D = level_instance.find_child("Props", true, false) as Node3D
	if props_node != null:
		var prop_count: int = 0
		for child in props_node.get_children():
			if child is StaticBody3D:
				prop_count += 1
		if prop_count < 3:
			printerr("SMOKE RESULT: FAIL \u2014 only ", prop_count, " props found, need >= 3")
			quit(1)
			return
		print("SMOKE: found ", prop_count, " props \u2014 PASS")
	else:
		printerr("SMOKE RESULT: FAIL \u2014 no 'Props' Node3D found")
		quit(1)
		return

	# Verify lighting exists
	var sun: DirectionalLight3D = level_instance.find_child("Sun", true, false) as DirectionalLight3D
	if sun == null:
		printerr("SMOKE RESULT: FAIL \u2014 no DirectionalLight3D named 'Sun' found")
		quit(1)
		return
	print("SMOKE: found Sun DirectionalLight3D")

	# Verify WorldEnvironment exists
	var env: WorldEnvironment = level_instance.find_child("WorldEnvironment", true, false) as WorldEnvironment
	if env == null:
		printerr("SMOKE RESULT: FAIL \u2014 no WorldEnvironment named 'WorldEnvironment' found")
		quit(1)
		return
	print("SMOKE: found WorldEnvironment")

	# All checks passed
	print("SMOKE RESULT: PASS")
	quit(0)