import { MetaType } from '../metaTypeCreator';
import { Firestore } from '../alias';
import { GetOddOrEvenSegments } from '../utils';
import { IsValidDocIDLoop } from '../validID';
import { DocumentReference } from './doc';
import { Query } from './query';
/**
 * A {@link CollectionReference} object can be used for adding documents, getting
 * {@link DocumentReference}, and querying for documents (using {@link Query}).
 */
export interface CollectionReference<T extends MetaType> extends Query<T> {
    /** The type of this Firestore reference. */
    readonly type: 'collection';
    /** The collection's identifier. */
    get id(): T['collectionID'];
    /**
     * A string representing the path of the referenced collection (relative
     * to the root of the database).
     */
    get path(): T['collectionPath'];
    /**
     * A reference to the containing parent {@link DocumentReference} if this is a
     * sub-collection. If this isn't a sub-collection, the reference is null.
     */
    get parent(): T['parent'] extends MetaType ? DocumentReference<T['parent']> : null;
}
export type CollectionCreator = <T extends MetaType>(fStore: Firestore, ...collectionIDs: GetOddOrEvenSegments<T['collectionPath'], 'Odd'>) => Collection<T>;
export type Collection<T extends MetaType> = {
    /**
     * Gets a {@link CollectionReference} instance that refers to the collection at
     * the specified absolute path.
     *
     *  related documentations:
     *  - {@link https://firelordjs.com/guides/metatype child meta type}
     *  - {@link https://firelordjs.com/quick_start#operations operation}
     * @param documentIds
     *  All the docID(s) needed to build this document path, eg
     *  - for top-collection: example.collection()
     *  - for sub-collection: example.collection(GrandParentDocId, ParentsDocId)
     *
     * @returns The {@link CollectionReference} instance.
     */
    <D extends GetOddOrEvenSegments<T['collectionPath'], 'Even'>>(...documentIDs: D extends never ? D : IsValidDocIDLoop<D>): CollectionReference<T>;
};
export type GetCollectionIds<T extends MetaType> = GetOddOrEvenSegments<T['collectionPath'], 'Even'>;