import { sqlite, postgres } from "emdash/db";

/**
 * Database configuration from environment variables.
 *
 * Supports:
 * - SQLite: DATABASE_URL=file:./storage/data.db
 * - PostgreSQL: DATABASE_URL=postgresql://user:pass@host:5432/db
 * - MySQL: DATABASE_URL=mysql://user:pass@host:3306/db
 */
export function getDatabaseConfig() {
	const url = process.env.DATABASE_URL;

	if (!url) {
		// Default to SQLite
		return sqlite({ url: "file:./storage/data.db" });
	}

	if (url.startsWith("file:")) {
		// SQLite
		return sqlite({ url: url });
	}

	if (url.startsWith("postgresql:")) {
		// PostgreSQL
		return postgres({ connectionString: url });
	}

	// Fallback to SQLite
	console.warn(`Unknown DATABASE_URL protocol, falling back to SQLite`);
	return sqlite({ url: "file:./storage/data.db" });
}