import { MssqlConfig, OracleConfig } from 'ormconfig';
import { createPool, Pool, Connection as cob } from 'oracledb';
import { Connection, ConnectionPool } from 'mssql';
import { Injectable } from '@nestjs/common';

@Injectable()
export class OracleDBService {
  private pool: Pool;

  constructor() {
    this.initializePool();
  }

  private async initializePool() {
    this.pool = await createPool({
      ...OracleConfig,
      poolMin: 1,
      poolMax: 10,
      poolIncrement: 1,
    });
  }

  async getConnection(): Promise<cob> {
    const connection = await this.pool.getConnection();
    console.log('Database connection initialized successfully for oracle.');
    return connection;
  }
}

@Injectable()
export class MssqlDBService {
  private pool: ConnectionPool;
  private readonly config = {
    ...MssqlConfig,
    server: 'localhost',
    pool: {
      max: 10,
      min: 0,
      idleTimeoutMillis: 30000,
    },
  };

  constructor() {
    this.initializePool();
  }

  private initializePool() {
    this.pool = new ConnectionPool(this.config);
  }

  async getConnection(): Promise<Connection> {
    try {
      const connection = await this.pool.connect();
      console.log('Database connection initialized successfully for Mssql.');
      // console.log(`Connection established to server: ${this.config.server}`); // Log server info
      return connection;
    } catch (error) {
      console.error('Error getting connection from pool', error.stack);
      throw error; // Rethrow the error after logging
    }
  }
}