extends Node3D

@export var camera: Camera3D
@export var target: Node3D
@export var sensitivity := 0.01

func _input(event):
	if event is InputEventMouseMotion:
		rotate_view(event.relative*sensitivity)

func _process(_delta):
	transform.origin = target.global_position
	camera.global_position = %camera_spot.global_position
	camera.look_at(target.global_position)

func rotate_view(amount: Vector2):
	rotate_y(-amount.x)
	%rotate_helper.rotate_z(amount.y)
	%rotate_helper.rotation_degrees.z = clampf(%rotate_helper.rotation_degrees.z, -77, 77)

func set_target(node: Node3D, should_unset=true):
	if target != null and should_unset:
		pass

var old_material_props = null

func change_material(mesh: MeshInstance3D):
	if old_material_props != null:
		push_error("UH OOH!!! 628")
	old_material_props = []
	for i in range(mesh.get_surface_override_material_count()):
		var mat := mesh.get_active_material(i)
		if mat is BaseMaterial3D:
			old_material_props.append(mat.depth_draw_mode)
			mat.depth_draw_mode = BaseMaterial3D.DEPTH_DRAW_DISABLED
			push_next_pass(mat, preload("control_target_overlay.material"))
		else:
			old_material_props.append(null)
			push_error("Don't know how to handle shader material for", mesh)
			
func unchange_material(mesh: MeshInstance3D):
	if old_material_props == null:
		push_error("UH OOH!!! 629")
	for i in range(mesh.get_surface_override_material_count()):
		var mat := mesh.get_active_material(i)
		if mat is BaseMaterial3D:
			mat.depth_draw_mode = old_material_props[i]
			pop_next_pass(mat)
		else:
			push_error("Don't know how to handle shader material for", mesh)

func push_next_pass(m: Material, with: Material):
	if m.next_pass != null:
		push_next_pass(m.next_pass, with)
	else:
		m.next_pass = with

func pop_next_pass(m: Material):
	if m == null:
		return true
	if pop_next_pass(m.next_pass):
		m.next_pass = null
	return false