backend/src/config/database.ts

import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { TypeOrmModuleOptions, TypeOrmOptionsFactory } from '@nestjs/typeorm';

import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

@Injectable()
export class DatabaseConfigService implements TypeOrmOptionsFactory {
  constructor(private readonly configService: ConfigService) {}

  createTypeOrmOptions(): TypeOrmModuleOptions {
    return {
      type: 'postgres',
      host: this.configService.get('db.host'),
      port: this.configService.get('db.port'),
      username: this.configService.get('db.user_name'),
      database: this.configService.get('db.name'),
      password: this.configService.get('db.password'),
      entities: [path.join(__dirname, '../**/*.entity{.ts,.js}')],
      maxQueryExecutionTime: this.configService.get('db.slow_limit'),
    };
  }
}