package database

import (
	"fmt"
	"time"

	"mengstack/internal/config"

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

func NewPostgres(cfg config.DatabaseConfig) (*gorm.DB, error) {
	dsn := fmt.Sprintf(
		"host=%s port=%d user=%s password=%s dbname=%s sslmode=%s TimeZone=Asia/Shanghai",
		cfg.Host, cfg.Port, cfg.User, cfg.Password, cfg.DBName, cfg.SSLMode,
	)

	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	if err != nil {
		return nil, fmt.Errorf("connect to PostgreSQL: %w", err)
	}

	sqlDB, err := db.DB()
	if err != nil {
		return nil, err
	}

	sqlDB.SetMaxIdleConns(10)
	sqlDB.SetMaxOpenConns(100)
	sqlDB.SetConnMaxLifetime(time.Hour)

	return db, nil
}