extends SceneTree
## Top-down + angled aerial of the arena with the crowd, plus axis markers, to locate
## the ruined section and any billboards left floating over it.
##   godot --script tools/preview_topdown.gd
## Output: tools/preview/top.png (ortho top-down), tools/preview/aerial.png

const OUT := "res://tools/preview"


func _init() -> void:
	_run.call_deferred()


func _run() -> void:
	DirAccess.make_dir_recursive_absolute(OUT)
	var scene := (load("res://scene.tscn") as PackedScene).instantiate()
	root.add_child(scene)
	current_scene = scene

	# Axis markers: red pillar at +X (east), green at +Z (south), so directions read.
	_marker(scene, Vector3(18, 5, 0), Color(1, 0.2, 0.2))
	_marker(scene, Vector3(0, 5, 18), Color(0.2, 1, 0.2))

	await create_timer(0.4).timeout
	var crowd := scene.get_node_or_null(^"CrowdBillboards") as MultiMeshInstance3D
	if crowd != null and crowd.multimesh != null:
		print("crowd instances = ", crowd.multimesh.instance_count)

	var top := Camera3D.new()
	top.projection = Camera3D.PROJECTION_ORTHOGONAL
	top.size = 46.0
	scene.add_child(top)
	top.look_at_from_position(Vector3(0, 60, 0.01), Vector3.ZERO, Vector3(0, 0, -1))
	top.current = true
	await create_timer(0.2).timeout
	_shot("top.png")

	var air := Camera3D.new()
	air.fov = 60.0
	scene.add_child(air)
	air.look_at_from_position(Vector3(0, 26, 34), Vector3(0, 3, 0), Vector3.UP)
	air.current = true
	await create_timer(0.2).timeout
	_shot("aerial.png")
	quit(0)


func _marker(scene: Node, pos: Vector3, col: Color) -> void:
	var m := MeshInstance3D.new()
	var box := BoxMesh.new()
	box.size = Vector3(1.5, 10.0, 1.5)
	var mat := StandardMaterial3D.new()
	mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	mat.albedo_color = col
	box.material = mat
	m.mesh = box
	scene.add_child(m)
	m.global_position = pos


func _shot(name: String) -> void:
	var img := root.get_viewport().get_texture().get_image()
	if img != null:
		img.save_png(OUT + "/" + name)
		print("captured ", name)