package clause

type Delete struct {
	Modifier string
}

func (d Delete) Name() string {
	return "DELETE"
}

func (d Delete) Build(builder Builder) {
	builder.WriteString("DELETE")

	if d.Modifier != "" {
		builder.WriteByte(' ')
		builder.WriteString(d.Modifier)
	}
}

func (d Delete) MergeClause(clause *Clause) {
	clause.Name = ""
	clause.Expression = d

	results := []struct {
		Clauses []clause.Interface
		Result  string
		Vars    []interface{}
	}{
		{
			[]clause.Interface{clause.Delete{}, clause.From{}},
			"DELETE FROM `users`", nil,
		},
		{
			[]clause.Interface{clause.Delete{Modifier: "LOW_PRIORITY"}, clause.From{}},
			"DELETE LOW_PRIORITY FROM `users`", nil,
		},
	}

	for idx, result := range results {
		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {

	user1 := *GetUser("inline_delete_1", Config{})
	user2 := *GetUser("inline_delete_2", Config{})
	DB.Save(&user1).Save(&user2)

	if DB.Delete(&User{}, user1.ID).Error != nil {
		t.Errorf("No error should happen when delete a record")
	} else if err := DB.Where("name = ?", user1.Name).First(&User{}).Error; !errors.Is(err, gorm.ErrRecordNotFound) {
		t.Errorf("User can't be found after delete")
	}

	// Delete
	if err := DB.Model(&user2).Association("Languages").Delete(&Language{}); err != nil {
		t.Fatalf("Error happened when delete language, got %v", err)
	}
	AssertAssociationCount(t, user2, "Languages", 1, "after delete non-existing data")

	if err := DB.Model(&user2).Association("Languages").Delete(&language2); err != nil {
		t.Fatalf("Error happened when delete Languages, got %v", err)
	}

}

// DeleteAll - Returns true if the action demands deleting all versions of an object
func (a Action) DeleteAll() bool {
	return a == DeleteAllVersionsAction
}

// Delete - Returns true if action demands delete on all objects (including restored)
func (a Action) Delete() bool {
	if a.DeleteRestored() {
		return true
	}
	return a == DeleteVersionAction || a == DeleteAction || a == DeleteAllVersionsAction
}

}

// setPutObjHeaders sets all the necessary headers returned back
// upon a success Put/Copy/CompleteMultipart/Delete requests
// to activate delete only headers set delete as true
func setPutObjHeaders(w http.ResponseWriter, objInfo ObjectInfo, delete bool) {
	// We must not use the http.Header().Set method here because some (broken)

					DeleteReplication:       DeleteReplication{Status: Enabled},
					Filter:                  Filter{},
				},
			},
		},
		{ // Config1 - Replication config has no filters, delete,delete-marker replication disabled
			Rules: []Rule{
				{
					Status:                  Enabled,
					Priority:                3,
					DeleteMarkerReplication: DeleteMarkerReplication{Status: Disabled},

	MTime                time.Time // Is only set in POST/PUT operations
	Expires              time.Time // Is only used in POST/PUT operations

	DeleteMarker            bool // Is only set in DELETE operations for delete marker replication
	CheckDMReplicationReady bool // Is delete marker ready to be replicated - set only during HEAD
	Tagging                 bool // Is only in GET/HEAD operations to return tagging metadata along with regular metadata and body.

}

// delete all cache data on disks.
func (m *metacache) delete(ctx context.Context) {
	if m.bucket == "" || m.id == "" {
		bugLogIf(ctx, fmt.Errorf("metacache.delete: bucket (%s) or id (%s) empty", m.bucket, m.id))
		return
	}
	objAPI := newObjectLayerFn()
	if objAPI == nil {
		internalLogIf(ctx, errors.New("metacache.delete: no object layer"))
		return
	}

	var err error
	// belongs to
	err = DB.Model(&emptyUser).Association("Company").Delete(&user1.Company)
	AssertEqual(t, err, gorm.ErrPrimaryKeyRequired)
	// has many
	err = DB.Model(&emptyUser).Association("Pets").Delete(&user1.Pets)
	AssertEqual(t, err, gorm.ErrPrimaryKeyRequired)
	// has one
	err = DB.Model(&emptyUser).Association("Account").Delete(&user1.Account)
	AssertEqual(t, err, gorm.ErrPrimaryKeyRequired)
	// many to many