package synchronizator

import "fmt"

// Utility struct to represent a collection of nodes, it's a [Node] itself so all
// the node's functionality is available.
type Collection struct {
	Node           // Underlaying node info
	childs []*Node // Child nodes
}

// Internal RelationshipClass to handle the collection to node relationship
type collection_relation struct{}

func (collection *collection_relation) ToRelationship() (string, []byte, error) {
	return "COLLECTION_HAS", nil, nil
}

func (collection *collection_relation) FromRelationship(_class string, metadata []byte) error {
	if _class != "COLLECTION_HAS" {
		return fmt.Errorf("invalid class %s", _class)
	}
	return nil
}

// Adds a new child to this collection. Use the underlaying node's AddRelation
// method.
func (collection *Collection) AddChild(node *Node) error {
	_, err := collection.AddRelation(&collection_relation{}, node.Id)
	if err != nil {
		return err
	}

	collection.childs = append(collection.childs, node)

	return nil
}