import { DuckDBConnection, DuckDBInstance } from "@duckdb/node-api";
import { Migrations } from "./migrations/migrations.ts";

export class Manager {
	/**
	 * The internal database connection, available when the manager is initialized.
	 * @protected
	 */
	protected database?: DuckDBInstance;

	/**
	 * Main initialization promise.
	 * @protected
	 */
	protected initialization: Promise<void>;

	constructor(public readonly options: { databasePath?: string } = {}) {
		this.initialization = this.initialize();
	}

	/**
	 * Initialize the infernod manager.
	 */
	async initialize(): Promise<void> {
		this.database = await DuckDBInstance.create(this.databasePath);

		// Setup database.
		const migrations = new Migrations(this);
		await migrations.execute();
		await migrations.close();
	}

	/**
	 * Return the promise to wait for initialization.
	 */
	async waitForInitialized(): Promise<void> {
		return this.initialization;
	}

	/**
	 * Get database path option, using default value if undefined.
	 */
	get databasePath(): string {
		return this.options?.databasePath ?? "infernod.db";
	}

	/**
	 * Get a new database connection.
	 */
	newDatabaseConnection(): Promise<DuckDBConnection> {
		return this.database!.connect();
	}
}