import { getDatabaseConfig, getQueueConfig } from '@stock-bot/config';
import { getLogger } from '@stock-bot/logger';
import { 
  ConnectionFactory, 
  ServiceContainer,
  PoolSizeCalculator,
  createServiceContainer
} from '@stock-bot/di';
import type { DynamicPoolConfig } from '@stock-bot/mongodb';

const logger = getLogger('database-setup');

/**
 * Creates a connection factory configured for the data-ingestion service
 */
export function createConnectionFactory(): ConnectionFactory {
  const dbConfig = getDatabaseConfig();
  
  const factoryConfig: ConnectionFactoryConfig = {
    service: 'data-ingestion',
    environment: process.env.NODE_ENV as 'development' | 'production' | 'test' || 'development',
    pools: {
      mongodb: {
        poolSize: 50, // Higher for batch imports
      },
      postgres: {
        poolSize: 30,
      },
      cache: {
        poolSize: 20,
      },
      queue: {
        poolSize: 1, // QueueManager is a singleton
      }
    }
  };
  
  return new ConnectionFactory(factoryConfig);
}

/**
 * Sets up the service container with all dependencies
 */
export async function setupServiceContainer(): Promise<{ container: ServiceContainer, factory: ConnectionFactory }> {
  logger.info('Setting up service container for data-ingestion');
  
  const connectionFactory = createConnectionFactory();
  const dbConfig = getDatabaseConfig();
  
  // Create enhanced service container with connection factory
  const container = createServiceContainer('data-ingestion', connectionFactory, {
    database: dbConfig
  });
  
  // Override the default database connections with specific configurations
  // MongoDB with dynamic pool sizing for batch operations
  container.register({
    name: 'mongodb',
    factory: async () => {
      const poolSize = PoolSizeCalculator.calculate('data-ingestion', 'batch-import');
      const pool = await connectionFactory.createMongoDB({
        name: 'data-ingestion',
        config: {
          uri: dbConfig.mongodb.uri,
          database: dbConfig.mongodb.database,
          host: dbConfig.mongodb.host,
          port: dbConfig.mongodb.port,
          username: dbConfig.mongodb.username,
          password: dbConfig.mongodb.password,
          authSource: dbConfig.mongodb.authSource,
          poolSettings: {
            maxPoolSize: poolSize.max,
            minPoolSize: poolSize.min,
            maxIdleTime: 30000,
          }
        },
        maxConnections: poolSize.max,
        minConnections: poolSize.min,
      });
      return pool.client;
    },
    singleton: true,
  });
  
  // PostgreSQL with optimized settings for data ingestion
  container.register({
    name: 'postgres',
    factory: async () => {
      const poolSize = PoolSizeCalculator.calculate('data-ingestion');
      const pool = await connectionFactory.createPostgreSQL({
        name: 'data-ingestion',
        config: {
          host: dbConfig.postgresql.host,
          port: dbConfig.postgresql.port,
          database: dbConfig.postgresql.database,
          username: dbConfig.postgresql.user,
          password: dbConfig.postgresql.password,
          poolSettings: {
            max: poolSize.max,
            min: poolSize.min,
            idleTimeoutMillis: 30000,
          }
        },
        maxConnections: poolSize.max,
        minConnections: poolSize.min,
      });
      return pool.client;
    },
    singleton: true,
  });
  
  // Cache with data-ingestion specific configuration
  container.register({
    name: 'cache',
    factory: async () => {
      const pool = await connectionFactory.createCache({
        name: 'data-ingestion',
        config: {
          host: dbConfig.dragonfly.host,
          port: dbConfig.dragonfly.port,
          db: dbConfig.dragonfly.db,
        }
      });
      return pool.client;
    },
    singleton: true,
  });
  
  // Queue with data-ingestion specific configuration
  container.register({
    name: 'queue',
    factory: async () => {
      const pool = await connectionFactory.createQueue({
        name: 'data-ingestion',
        config: {
          host: dbConfig.dragonfly.host,
          port: dbConfig.dragonfly.port,
          db: dbConfig.dragonfly.db || 1,
        }
      });
      return pool.client;
    },
    singleton: true,
  });
  
  logger.info('Service container setup complete');
  
  // Optional: Enable dynamic pool sizing for production
  if (process.env.NODE_ENV === 'production') {
    await enableDynamicPoolSizing(container);
  }
  
  return { container, factory: connectionFactory };
}

/**
 * Enable dynamic pool sizing for production workloads
 */
async function enableDynamicPoolSizing(container: ServiceContainer): Promise<void> {
  const dynamicConfig: DynamicPoolConfig = {
    enabled: true,
    minSize: 5,
    maxSize: 100,
    scaleUpThreshold: 70,
    scaleDownThreshold: 30,
    scaleUpIncrement: 10,
    scaleDownIncrement: 5,
    evaluationInterval: 30000, // Check every 30 seconds
  };
  
  try {
    // Set dynamic config for MongoDB
    const mongoClient = await container.resolveAsync('mongodb');
    if (mongoClient && typeof mongoClient.setDynamicPoolConfig === 'function') {
      mongoClient.setDynamicPoolConfig(dynamicConfig);
      logger.info('Dynamic pool sizing enabled for MongoDB');
    }
    
    // Set dynamic config for PostgreSQL
    const pgClient = await container.resolveAsync('postgres');
    if (pgClient && typeof pgClient.setDynamicPoolConfig === 'function') {
      pgClient.setDynamicPoolConfig(dynamicConfig);
      logger.info('Dynamic pool sizing enabled for PostgreSQL');
    }
  } catch (error) {
    logger.warn('Failed to enable dynamic pool sizing', { error });
  }
}