// MongoClient class for handling database operations
class MongoClient {
  // Private property to store the default database name
  private _databaseName: string;

  // Properties to store the currently selected database and collection names
  private selectedDatabase: string = "";
  private selectedCollection: string = "";

  // Constructor to initialize the MongoClient with a default database name
  constructor(databaseName: string) {
      this._databaseName = databaseName;
  }

  // Method to set the database for subsequent operations and return the MongoClient instance
  database(databaseName: string): MongoClient {
      this.selectedDatabase = databaseName;
      return this;
  }

  // Method to set the collection for subsequent operations and return the MongoClient instance
  collection(collectionName: string): MongoClient {
      this.selectedCollection = collectionName;
      return this;
  }

  // Async method to find a single document based on a query
  // Optionally, a specific collection name can be provided
  async findOne(query: any, collectionName?: string): Promise<any> {
      // Placeholder for actual database operation
      return new Promise((resolve, reject) => {
          resolve({ data: "data" }); // Dummy data returned for illustration
      });
  }

  // Async method to find documents based on a query
  // Optionally, a specific collection name can be provided
  async find(query: any, collectionName?: string): Promise<any> {
      // Placeholder for actual database operation
      return new Promise((resolve, reject) => {
          resolve({ data: "data" }); // Dummy data returned for illustration
      });
  }

  // Async method to find a document by its ID
  // Optionally, a specific collection name can be provided
  async findById(id: any, collectionName?: string): Promise<any> {
      // Placeholder for actual database operation
      return new Promise((resolve, reject) => {
          resolve({ data: "data" }); // Dummy data returned for illustration
      });
  }
}

// Export the MongoClient class for use in other modules
export default MongoClient;