extends SceneTree
## Boundary test: tries to escape the valley in several directions by walking
## and spamming jump at the mountain rim, and fails if the player ever gets past
## the invisible wall, falls off the map, or ends up stuck below the waterline
## (in a pit near the edge).
##
## Run: godot --headless --path . --fixed-fps 30 --script res://tests/test_boundary.gd

const DIRECTIONS := 24
const SECONDS_PER_TRY := 25.0

func _initialize() -> void:
	var world: Node3D = load("res://scenes/world.tscn").instantiate()
	root.add_child(world)
	_run.call_deferred(world)

func _run(world: Node3D) -> void:
	for _i in range(10):
		await physics_frame
	var terrain: Node3D = world.get_node("Terrain")
	var player: CharacterBody3D = world.get_node("Player")
	var failures := 0
	var tick := 1.0 / Engine.physics_ticks_per_second
	for i in range(DIRECTIONS):
		var ang := TAU * i / DIRECTIONS
		var out := Vector3(cos(ang), 0.0, sin(ang))
		var start: Vector3 = out * (terrain.play_radius - 12.0)
		start.y = terrain.sample_height(start.x, start.z) + 1.0
		player.global_position = start
		player.velocity = Vector3.ZERO
		player.rotation = Vector3(0.0, atan2(-out.x, -out.z), 0.0)
		Input.action_press("move_forward")
		var escaped := false
		var max_d := 0.0
		var frames := int(SECONDS_PER_TRY / tick)
		for f in range(frames):
			if f % 12 == 0:
				Input.action_press("jump")
			elif f % 12 == 1:
				Input.action_release("jump")
			await physics_frame
			var p := player.global_position
			max_d = maxf(max_d, Vector2(p.x, p.z).length())
			if not terrain.inside_boundary(p.x, p.z, -1.5) or p.y < terrain.min_height - 5.0:
				escaped = true
				break
		Input.action_release("move_forward")
		Input.action_release("jump")
		var p := player.global_position
		if not escaped and p.y < terrain.water_level - 0.5:
			escaped = true   # stuck in a pit below the waterline
		print("dir %2d (%3d deg): %s  max radius %.1f  final (%.1f, %.1f, %.1f)" % [
			i, int(rad_to_deg(ang)), "FAILED" if escaped else "held", max_d, p.x, p.y, p.z])
		if escaped:
			failures += 1
	print("RESULT: %s (%d/%d directions held)" % ["PASS" if failures == 0 else "FAIL", DIRECTIONS - failures, DIRECTIONS])
	quit(1 if failures > 0 else 0)