import { ToolCapability } from '../../../types/mcp-config';

/**
 * @interface CloudSQLConfig
 * @description Configuration for Google Cloud SQL operations.
 */
export interface CloudSQLConfig {
  instanceName: string;
  databaseName: string;
  projectID: string;
  region: string;
  // Add authentication details if needed, e.g., service account key path
}

/**
 * @interface CloudSQLOperations
 * @description Defines the operations available for Google Cloud SQL.
 */
export interface CloudSQLOperations {
  executeQuery(query: string, params?: any[]): Promise<any>;
  manageInstance(action: 'start' | 'stop' | 'restart' | 'resize', options?: any): Promise<any>;
  configureDatabase(config: { [key: string]: any }): Promise<any>;
  listDatabases(): Promise<string[]>;
  listTables(databaseName: string): Promise<string[]>;
}

/**
 * @class CloudSQLTool
 * @description Implements Google Cloud SQL operations as an MCP tool.
 */
export class CloudSQLTool implements CloudSQLOperations {
  private config: CloudSQLConfig;
  // Placeholder for Google Cloud SQL client library
  // private sqlClient: any; 

  constructor(config: CloudSQLConfig) {
    this.config = config;
    // Initialize Google Cloud SQL client here
    // For now, it's a placeholder.
    console.log(`CloudSQLTool initialized for instance: ${config.instanceName}`);
  }

  /**
   * Executes a SQL query against the configured Cloud SQL database.
   * @param {string} query The SQL query to execute.
   * @param {any[]} [params] Optional parameters for the query.
   * @returns {Promise<any>} The result of the query.
   */
  public async executeQuery(query: string, params?: any[]): Promise<any> {
    console.log(`Executing query on Cloud SQL instance ${this.config.instanceName}/${this.config.databaseName}: ${query}`);
    // Placeholder for actual GCP Cloud SQL client execution
    await new Promise(resolve => setTimeout(resolve, 500)); // Simulate network delay
    const simulatedResult = { rowsAffected: 1, data: [{ id: 1, name: 'simulated_data' }] };
    console.log('Query executed successfully (simulated).', simulatedResult);
    return simulatedResult;
  }

  /**
   * Manages the Cloud SQL instance (start, stop, restart, resize).
   * @param {'start' | 'stop' | 'restart' | 'resize'} action The management action to perform.
   * @param {any} [options] Additional options for the action (e.g., new size for resize).
   * @returns {Promise<any>} The result of the management operation.
   */
  public async manageInstance(action: 'start' | 'stop' | 'restart' | 'resize', options?: any): Promise<any> {
    console.log(`Managing Cloud SQL instance ${this.config.instanceName}: ${action}`);
    // Placeholder for actual GCP Cloud SQL Admin API calls
    await new Promise(resolve => setTimeout(resolve, 1000)); // Simulate API call delay
    const simulatedResult = { status: 'success', action: action, instance: this.config.instanceName };
    console.log('Instance management successful (simulated).', simulatedResult);
    return simulatedResult;
  }

  /**
   * Configures the Cloud SQL database settings.
   * @param {{ [key: string]: any }} config The configuration settings to apply.
   * @returns {Promise<any>} The result of the configuration update.
   */
  public async configureDatabase(config: { [key: string]: any }): Promise<any> {
    console.log(`Configuring Cloud SQL database ${this.config.databaseName} on instance ${this.config.instanceName}:`, config);
    // Placeholder for actual GCP Cloud SQL Admin API calls
    await new Promise(resolve => setTimeout(resolve, 700)); // Simulate API call delay
    const simulatedResult = { status: 'success', configApplied: config };
    console.log('Database configuration successful (simulated).', simulatedResult);
    return simulatedResult;
  }

  /**
   * Lists all databases in the Cloud SQL instance.
   * @returns {Promise<string[]>} A list of database names.
   */
  public async listDatabases(): Promise<string[]> {
    console.log(`Listing databases for Cloud SQL instance ${this.config.instanceName}`);
    await new Promise(resolve => setTimeout(resolve, 300));
    const simulatedDatabases = ['master', 'my_app_db', 'analytics_db'];
    console.log('Databases listed (simulated).', simulatedDatabases);
    return simulatedDatabases;
  }

  /**
   * Lists all tables in a specific database within the Cloud SQL instance.
   * @param {string} databaseName The name of the database.
   * @returns {Promise<string[]>} A list of table names.
   */
  public async listTables(databaseName: string): Promise<string[]> {
    console.log(`Listing tables in database ${databaseName} on instance ${this.config.instanceName}`);
    await new Promise(resolve => setTimeout(resolve, 400));
    const simulatedTables = [`${databaseName}_users`, `${databaseName}_products`, `${databaseName}_orders`];
    console.log('Tables listed (simulated).', simulatedTables);
    return simulatedTables;
  }

  /**
   * Returns the capabilities provided by this tool.
   * @returns {ToolCapability[]} An array of tool capabilities.
   */
  public static getCapabilities(): ToolCapability[] {
    return [
      { name: 'cloud_sql_execute_query', description: 'Executes a SQL query on Google Cloud SQL.' },
      { name: 'cloud_sql_manage_instance', description: `Manages Google Cloud SQL instance (start, stop, restart, resize).
` },
      { name: 'cloud_sql_configure_database', description: 'Configures Google Cloud SQL database settings.' },
      { name: 'cloud_sql_list_databases', description: 'Lists databases in a Google Cloud SQL instance.' },
      { name: 'cloud_sql_list_tables', description: 'Lists tables in a Google Cloud SQL database.' },
    ];
  }
}