// Package clause provides the clause interface and common clause implementations for GORM.
package clause

// Interface clause interface
type Interface interface {
	Name() string
	Build(Builder)
	MergeClause(*Clause)
}

// ClauseBuilder clause builder, allows to customize how to build clause
type ClauseBuilder func(Clause, Builder)

type Writer interface {
	WriteByte(byte) error
	WriteString(string) (int, error)
}

	tx = db.getInstance()
	tx.Statement.Model = value
	return
}

// Clauses Add clauses
//
// This supports both standard clauses (clause.OrderBy, clause.Limit, clause.Where) and more
// advanced techniques like specifying lock strength and optimizer hints. See the
// [docs] for more depth.
//
//	// add a simple limit clause
//	db.Clauses(clause.Limit{Limit: 1}).Find(&User{})
//	// tell the optimizer to use the `idx_user_name` index

	"strings"
	"testing"

	"gorm.io/gorm/clause"
)

// Compile-time assertions that types implement clause.Assigner
var (
	_ clause.Assigner = clause.Assignment{}
	_ clause.Assigner = clause.Set{}
)

func TestSet(t *testing.T) {
	results := []struct {
		Clauses []clause.Interface
		Result  string
		Vars    []interface{}
	}{
		{
			[]clause.Interface{
				clause.Update{},

				[]clause.Column{clause.PrimaryColumn},
			}, clause.Returning{
				[]clause.Column{{Name: "name"}, {Name: "age"}},
			}},
			"SELECT * FROM `users` RETURNING `users`.`id`,`name`,`age`", nil,
		},
		{
			[]clause.Interface{clause.Select{}, clause.From{}, clause.Returning{
				[]clause.Column{clause.PrimaryColumn},
			}, clause.Returning{}, clause.Returning{
				[]clause.Column{{Name: "name"}, {Name: "age"}},
			}},

								for _, c := range relation.FieldSchema.QueryClauses {
									onStmt.AddClause(c)
								}

								if join.On != nil {
									onStmt.AddClause(join.On)
								}

								if cs, ok := onStmt.Clauses["WHERE"]; ok {
									if where, ok := cs.Expression.(clause.Where); ok {
										where.Build(&onStmt)

			break
		}
		queryDB = tx.Clauses(clause.Gt{Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey}, Value: primaryValue})
	}

	tx.RowsAffected = rowsAffected
	return tx
}

func (db *DB) assignInterfacesToValue(values ...interface{}) {
	for _, value := range values {
		switch v := value.(type) {
		case []clause.Expression:
			for _, expr := range v {

	tx = tx.Where("age = ?", 20)
	c, ok := tx.Statement.Clauses["WHERE"]
	if !ok {
		t.Fatalf("WHERE clause expected")
	}
	if where, ok := c.Expression.(clause.Where); !ok || len(where.Exprs) == 0 {
		t.Fatalf("WHERE expressions expected, got %v", c.Expression)
	}

	// Order
	tx = tx.Order("name DESC")
	if _, ok := tx.Statement.Clauses["ORDER BY"]; !ok {
		t.Fatalf("ORDER BY clause expected")
	}

	// Limit / Offset

	"time"

	"gorm.io/gorm"
	"gorm.io/gorm/clause"
	. "gorm.io/gorm/utils/tests"
)

func TestUpsert(t *testing.T) {
	lang := Language{Code: "upsert", Name: "Upsert"}
	if err := DB.Clauses(clause.OnConflict{DoNothing: true}).Create(&lang).Error; err != nil {
		t.Fatalf("failed to upsert, got %v", err)
	}

	lang2 := Language{Code: "upsert", Name: "Upsert"}

						}

						if len(values) > 0 {
							conds = append(conds, clause.IN{Column: clause.Column{Table: curTable, Name: clause.PrimaryKey}, Values: values})
							return []clause.Expression{clause.And(conds...)}
						}
						return nil
					}
				}

				conds = append(conds, clause.IN{Column: clause.Column{Table: curTable, Name: clause.PrimaryKey}, Values: args})
			}
		}
	}

	if len(conds) > 0 {

		tx = tx.Session(&Session{QueryFields: true}).Clauses(clause.From{Joins: []clause.Join{{
			Table: clause.Table{Name: association.Relationship.JoinTable.Table},
			ON:    clause.Where{Exprs: queryConds},
		}}})
	} else {
		tx.Clauses(clause.Where{Exprs: queryConds})
	}

	return tx
}

func expandValues(values ...any) (results []any) {
	appendToResult := func(rv reflect.Value) {
		// unwrap interface