extends SceneTree
## Smoke test for the player character scene and its spawn behavior.
##
## Run with:
##     godot --headless --path . --script res://scripts/smoke_test_player.gd
##
## Loads the test level, verifies the player is present, spawned at the
## PlayerSpawn marker, and has the expected CharacterBody3D structure.

var _passed := 0
var _failed := 0


func _initialize() -> void:
	print("SMOKE: starting player smoke test")
	_run()


func _run() -> void:
	await process_frame
	print("SMOKE: loading game scene")

	# Load scenes/game.tscn -- the real PC2 composition point (Level + Player
	# as siblings, per docs/architecture/pc2_test_level.md §4), not the level
	# scene directly. Use the same SceneTree API as the real game so
	# `current_scene` is populated before the scene is added and its
	# _ready() callbacks fire. That ordering is what the player's spawn
	# lookup (get_tree().current_scene) depends on.
	var packed: PackedScene = load("res://scenes/game.tscn")
	var result := change_scene_to_packed(packed)
	if result != OK:
		printerr("SMOKE: failed to change scene, error ", result)
		quit(1)
		return

	await scene_changed
	var game: Node3D = current_scene as Node3D
	print("SMOKE: game scene ready")

	# 1. Verify the player node exists in the scene tree.
	var player: Node = game.get_node("Player")
	_check("Player node exists in test level", player != null)
	_check("Player is a CharacterBody3D", player is CharacterBody3D)

	# 2. Verify the player has the expected child structure.
	var collision: Node = player.get_node("CollisionShape3D")
	_check("Player has CollisionShape3D", collision != null)
	_check("CollisionShape3D has a shape",
		   collision is CollisionShape3D and (collision as CollisionShape3D).shape != null)

	var mesh: Node = player.get_node("CapsuleMesh")
	_check("Player has CapsuleMesh", mesh != null)
	_check("CapsuleMesh has a mesh",
		   mesh is MeshInstance3D and (mesh as MeshInstance3D).mesh != null)

	# 3. Verify the player spawned at the PlayerSpawn marker position.
	var spawn_marker: Marker3D = game.get_node("Level/PlayerSpawn")
	_check("PlayerSpawn marker exists", spawn_marker != null)

	# The player's _ready() should have moved it to the spawn marker's
	# global position. Compare global positions directly (not local) since
	# Player and Level sit at different depths under Game.
	var expected_pos: Vector3 = spawn_marker.global_position
	_check("Player spawned at PlayerSpawn position",
		   player.global_position == expected_pos)

	# 4. Verify the player script class_name is correct and has the
	# movement constants defined.
	var script: GDScript = player.get_script() as GDScript
	_check("Player has a script attached", script != null)
	var constants: Dictionary = script.get_script_constant_map()
	_check("Player has WALK_SPEED constant", constants.has("WALK_SPEED"))
	_check("Player has GRAVITY constant", constants.has("GRAVITY"))
	_check("Player has JUMP_VELOCITY constant", constants.has("JUMP_VELOCITY"))
	_check("JUMP_VELOCITY is positive (upward)", float(constants.get("JUMP_VELOCITY", -1.0)) > 0.0)

	# 5. Verify the player has a Camera3D so the game is actually viewable
	# from the player's perspective, not just a walking capsule with no view.
	var camera: Node = player.find_child("Camera3D", true, false)
	_check("Player has a Camera3D", camera is Camera3D)
	_check("Camera3D is current", camera is Camera3D and (camera as Camera3D).current)
	# Third-person rig: the camera hangs off a SpringArm3D (so it pulls in
	# when a wall is behind the player) with real length.
	var arm: Node = player.find_child("SpringArm3D", true, false)
	_check("Camera is on a SpringArm3D (third-person)", arm is SpringArm3D)
	_check("SpringArm has real length", arm is SpringArm3D and (arm as SpringArm3D).spring_length >= 2.0)
	_check("Camera is a descendant of the SpringArm", camera != null and arm != null and arm.is_ancestor_of(camera))

	print("\n=== SMOKE RESULT: %d/%d passed ===" % [_passed, _passed + _failed])
	quit(0 if _failed == 0 else 1)


func _check(description: String, condition: bool) -> void:
	if condition:
		print("  PASS: ", description)
		_passed += 1
	else:
		printerr("  FAIL: ", description)
		_failed += 1