package config

import (
	"time"

	"go.uber.org/zap"

	"veza-backend-api/internal/database"
)

// initDatabaseWithRetry initialise la connexion à la base de données avec des tentatives de retry
func initDatabaseWithRetry(databaseURL, databaseReadURL string, maxRetries int, retryInterval time.Duration, logger *zap.Logger) (*database.Database, error) {
	dbConfig := &database.Config{
		URL: databaseURL,
		// BE-DB-015: Optimized connection pool settings for production
		// MaxOpenConns: Recommended formula: (2 * CPU cores) + effective_spindle_count
		// Default: 25 for small-medium apps, 50-100 for high-traffic apps
		MaxOpenConns: getEnvAsInt("DB_MAX_OPEN_CONNS", 50),
		// MaxIdleConns: Should be ~25% of MaxOpenConns to maintain warm connections
		MaxIdleConns: getEnvAsInt("DB_MAX_IDLE_CONNS", 12),
		// MaxLifetime: 5-15 minutes recommended to avoid connection timeouts
		// PostgreSQL default idle_in_transaction_session_timeout is 0 (unlimited)
		MaxLifetime: getEnvAsDuration("DB_MAX_LIFETIME", 10*time.Minute),
		// MaxIdleTime: 5-10 minutes to close idle connections and free resources
		MaxIdleTime:   getEnvAsDuration("DB_MAX_IDLE_TIME", 5*time.Minute),
		MaxRetries:    maxRetries,
		RetryInterval: retryInterval,
	}

	db, err := database.NewDatabaseWithRetry(dbConfig, logger)
	if err != nil {
		return nil, err
	}
	if databaseReadURL != "" {
		readConfig := &database.Config{
			URL:          databaseReadURL,
			MaxOpenConns: getEnvAsInt("DB_READ_MAX_OPEN_CONNS", 25),
			MaxIdleConns: getEnvAsInt("DB_READ_MAX_IDLE_CONNS", 6),
			MaxLifetime:  getEnvAsDuration("DB_MAX_LIFETIME", 10*time.Minute),
			MaxIdleTime:  getEnvAsDuration("DB_MAX_IDLE_TIME", 5*time.Minute),
		}
		if err := db.InitReadReplica(readConfig); err != nil {
			logger.Warn("Failed to init read replica, using primary for reads", zap.Error(err))
		}
	}
	return db, nil
}