package db

import (
	"fmt"
	"gpt-load/internal/types"
	"log"
	"os"
	"time"

	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var DB *gorm.DB

func NewDB(configManager types.ConfigManager) (*gorm.DB, error) {
	dbConfig := configManager.GetDatabaseConfig()
	if dbConfig.DSN == "" {
		return nil, fmt.Errorf("DATABASE_DSN is not configured")
	}

	var newLogger logger.Interface
	if configManager.GetLogConfig().Level == "debug" {
		newLogger = logger.New(
			log.New(os.Stdout, "\r\n", log.LstdFlags), // io writer
			logger.Config{
				SlowThreshold:             time.Second, // Slow SQL threshold
				LogLevel:                  logger.Info, // Log level
				IgnoreRecordNotFoundError: true,        // Ignore ErrRecordNotFound error for logger
				Colorful:                  true,        // Disable color
			},
		)
	}

	var err error
	DB, err = gorm.Open(mysql.Open(dbConfig.DSN), &gorm.Config{
		Logger: newLogger,
	})
	if err != nil {
		return nil, fmt.Errorf("failed to connect to database: %w", err)
	}

	sqlDB, err := DB.DB()
	if err != nil {
		return nil, fmt.Errorf("failed to get sql.DB: %w", err)
	}

	// Set connection pool parameters
	sqlDB.SetMaxIdleConns(10)
	sqlDB.SetMaxOpenConns(100)
	sqlDB.SetConnMaxLifetime(time.Hour)

	fmt.Println("Database connection initialized.")
	return DB, nil
}