package mdb

type collectionState[T any] struct {
	Version uint64
	Indices []indexState[T]
}

func (c *collectionState[T]) clone(version uint64) *collectionState[T] {
	indices := make([]indexState[T], len(c.Indices))
	for i := range indices {
		indices[i] = c.Indices[i].clone()
	}
	return &collectionState[T]{
		Version: version,
		Indices: indices,
	}
}

// Add an index returning it's assigned ID.
func (c *collectionState[T]) addIndex(idx indexState[T]) uint64 {
	id := uint64(len(c.Indices))
	c.Indices = append(c.Indices, idx)
	return id
}