class_name TransformTool
extends EditorTool
## Moves, rotates, or scales an existing object.
##
## Not one of the four tools literally named in docs/architecture/editor.md
## §7.1's `ToolRegistry` list ("brush / object-place / select / erase,
## etc.") but required by this task's brief ("place / move / rotate / scale
## / delete") -- the doc's own "etc." leaves room, so this is a fifth
## registered tool rather than overloading `ObjectPlaceTool` (placing a new
## object and re-transforming an existing one are different undo units)
## or `SelectTool` (selection is deliberately not chunk-mutating).
##
## `args`: `object_id` (String), `op` ("move" | "rotate" | "scale"), `value`
## (Vector3 for move/scale, Vector4 quaternion for rotate).


func _init() -> void:
	tool_id = "transform"


func apply(core: EditorCore, args: Dictionary) -> Variant:
	var object_id: String = args.get("object_id", "")
	var op: String = args.get("op", "")
	var obj := core.model.find_object(object_id)
	if obj == null:
		return false

	match op:
		"move":
			var new_val: Vector3 = args.get("value", obj.position)
			var old_val: Vector3 = obj.position
			var delta: Vector3 = new_val - old_val
			if new_val.is_equal_approx(old_val):
				return false
			var children_snapshots: Array = []
			for child in core.model.payload.objects:
				if child.properties is Dictionary and child.properties.get("parent_id") == object_id:
					children_snapshots.append({"id": child.id, "old_pos": child.position, "new_pos": child.position + delta})
			core.undo_redo.begin("Move '%s'" % object_id)
			core.undo_redo.add_do(func():
				core.model.set_object_position_raw(object_id, new_val)
				for cs in children_snapshots:
					core.model.set_object_position_raw(cs["id"], cs["new_pos"])
			)
			core.undo_redo.add_undo(func():
				core.model.set_object_position_raw(object_id, old_val)
				for cs in children_snapshots:
					core.model.set_object_position_raw(cs["id"], cs["old_pos"])
			)
			core.undo_redo.commit()
			return true
		"rotate":
			return _apply_vector4(core, object_id, args.get("value", obj.rotation),
				obj.rotation, "Rotate", core.model.set_object_rotation_raw)
		"scale":
			return _apply_vector3(core, object_id, args.get("value", obj.scale),
				obj.scale, "Scale", core.model.set_object_scale_raw)
		"property":
			var key: String = str(args.get("key", ""))
			var new_val: Variant = args.get("value")
			var old_val: Variant = obj.properties.get(key, null)
			return _apply_property(core, object_id, key, new_val, old_val)
		_:
			push_error("TransformTool: unknown op '%s'" % op)
			return false


func _apply_vector3(core: EditorCore, object_id: String, new_value: Vector3,
		old_value: Vector3, label: String, setter: Callable) -> bool:
	if new_value.is_equal_approx(old_value):
		return false
	core.undo_redo.begin("%s '%s'" % [label, object_id])
	core.undo_redo.add_do(setter.bind(object_id, new_value))
	core.undo_redo.add_undo(setter.bind(object_id, old_value))
	core.undo_redo.commit()
	return true


func _apply_vector4(core: EditorCore, object_id: String, new_value: Vector4,
		old_value: Vector4, label: String, setter: Callable) -> bool:
	if new_value.is_equal_approx(old_value):
		return false
	core.undo_redo.begin("%s '%s'" % [label, object_id])
	core.undo_redo.add_do(setter.bind(object_id, new_value))
	core.undo_redo.add_undo(setter.bind(object_id, old_value))
	core.undo_redo.commit()
	return true


func _apply_property(core: EditorCore, object_id: String, key: String,
		new_value: Variant, old_value: Variant) -> bool:
	core.undo_redo.begin("Set property '%s' on '%s'" % [key, object_id])
	core.undo_redo.add_do(core.model.set_object_property_raw.bind(object_id, key, new_value))
	core.undo_redo.add_undo(core.model.set_object_property_raw.bind(object_id, key, old_value))
	core.undo_redo.commit()
	return true