package mysql

import (
	"errors"
	"fmt"
	"testing"

	mysqldrv "github.com/go-sql-driver/mysql"
)

// 只有「对方已经建好了」这类冲突才重试；其余错误（权限、语法、连接断开）照旧直接返回。
func TestIsConcurrentDDLConflict(t *testing.T) {
	cases := map[error]bool{
		&mysqldrv.MySQLError{Number: 1060, Message: "Duplicate column name 'computeuser'"}: true,
		&mysqldrv.MySQLError{Number: 1050, Message: "Table already exists"}:                true,
		&mysqldrv.MySQLError{Number: 1061, Message: "Duplicate key name"}:                  true,
		fmt.Errorf("wrap: %w", &mysqldrv.MySQLError{Number: 1060}):                         true,
		&mysqldrv.MySQLError{Number: 1142, Message: "ALTER command denied"}:                false,
		errors.New("driver: bad connection"):                                               false,
	}
	for err, want := range cases {
		if got := isConcurrentDDLConflict(err); got != want {
			t.Errorf("%v → %v, want %v", err, got, want)
		}
	}
}