import { SqlInMemory } from "../driver/SqlInMemory";
/**
 * Creates complete tables schemas in the database based on the entity metadatas.
 *
 * Steps how schema is being built:
 * 1. load list of all tables with complete column and keys information from the db
 * 2. drop all (old) foreign keys that exist in the table, but does not exist in the metadata
 * 3. create new tables that does not exist in the db, but exist in the metadata
 * 4. drop all columns exist (left old) in the db table, but does not exist in the metadata
 * 5. add columns from metadata which does not exist in the table
 * 6. update all exist columns which metadata has changed
 * 7. update primary keys - update old and create new primary key from changed columns
 * 8. create foreign keys which does not exist in the table yet
 * 9. create indices which are missing in db yet, and drops indices which exist in the db, but does not exist in the metadata anymore
 */
export class MongoSchemaBuilder {
    // -------------------------------------------------------------------------
    // Constructor
    // -------------------------------------------------------------------------
    constructor(connection) {
        this.connection = connection;
    }
    // -------------------------------------------------------------------------
    // Public Methods
    // -------------------------------------------------------------------------
    /**
     * Creates complete schemas for the given entity metadatas.
     */
    async build() {
        const queryRunner = this.connection.createQueryRunner();
        const promises = [];
        this.connection.entityMetadatas.forEach((metadata) => {
            metadata.indices.forEach((index) => {
                const options = Object.assign({}, {
                    name: index.name,
                    unique: index.isUnique,
                    sparse: index.isSparse,
                    background: index.isBackground,
                }, index.expireAfterSeconds === undefined
                    ? {}
                    : { expireAfterSeconds: index.expireAfterSeconds });
                promises.push(queryRunner.createCollectionIndex(metadata.tableName, index.columnNamesWithOrderingMap, options));
            });
            metadata.uniques.forEach((unique) => {
                const options = {
                    name: unique.name,
                    unique: true,
                };
                promises.push(queryRunner.createCollectionIndex(metadata.tableName, unique.columnNamesWithOrderingMap, options));
            });
        });
        await Promise.all(promises);
    }
    /**
     * Returns query to be executed by schema builder.
     */
    log() {
        return Promise.resolve(new SqlInMemory());
    }
}

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