package callbacks

import (
	"gorm.io/gorm"
)

func BeginTransaction(db *gorm.DB) {
	if !db.Config.SkipDefaultTransaction && db.Error == nil {
		if tx := db.Begin(); tx.Error == nil {
			db.Statement.ConnPool = tx.Statement.ConnPool
			db.InstanceSet("gorm:started_transaction", true)
		} else if tx.Error == gorm.ErrInvalidTransaction {
			tx.Error = nil
		} else {
			db.Error = tx.Error
		}
	}
}

// Config GORM config
type Config struct {
	// GORM perform single create, update, delete operations in transactions by default to ensure database data integrity
	// You can disable it by setting `SkipDefaultTransaction` to true
	SkipDefaultTransaction bool
	// NamingStrategy tables, columns naming strategy
	NamingStrategy schema.Namer
	// FullSaveAssociations full save associations
	FullSaveAssociations bool
	// Logger
	Logger logger.Interface

	UpdateClauses        []string
	DeleteClauses        []string
}

func RegisterDefaultCallbacks(db *gorm.DB, config *Config) {
	enableTransaction := func(db *gorm.DB) bool {
		return !db.SkipDefaultTransaction
	}

	if len(config.CreateClauses) == 0 {
		config.CreateClauses = createClauses
	}
	if len(config.QueryClauses) == 0 {
		config.QueryClauses = queryClauses
	}
	if len(config.DeleteClauses) == 0 {

		t.Fatalf("no error should happen but got %v", err)
	}
}

func TestPreparedStmtFromTransaction(t *testing.T) {
	db := DB.Session(&gorm.Session{PrepareStmt: true, SkipDefaultTransaction: true})

	tx := db.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()
	if err := tx.Error; err != nil {
		t.Errorf("Failed to start transaction, got error %v\n", err)

				subtx.callbacks.Create().Execute(subtx)
				if subtx.Error != nil {
					return subtx.Error
				}
				rowsAffected += subtx.RowsAffected
			}
			return nil
		}

		if tx.SkipDefaultTransaction || reflectLen <= batchSize {
			tx.AddError(callFc(tx.Session(&Session{})))
		} else {
			tx.AddError(tx.Transaction(callFc))
		}

		tx.RowsAffected = rowsAffected
	default:
		tx = db.getInstance()