// Code generated by ent, DO NOT EDIT.

package hook

import (
	"context"
	"fmt"
	"wechat-api/ent"
)

// The AgentFunc type is an adapter to allow the use of ordinary
// function as Agent mutator.
type AgentFunc func(context.Context, *ent.AgentMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f AgentFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.AgentMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.AgentMutation", m)
}

// The AgentBaseFunc type is an adapter to allow the use of ordinary
// function as AgentBase mutator.
type AgentBaseFunc func(context.Context, *ent.AgentBaseMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f AgentBaseFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.AgentBaseMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.AgentBaseMutation", m)
}

// The AliyunAvatarFunc type is an adapter to allow the use of ordinary
// function as AliyunAvatar mutator.
type AliyunAvatarFunc func(context.Context, *ent.AliyunAvatarMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f AliyunAvatarFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.AliyunAvatarMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.AliyunAvatarMutation", m)
}

// The AllocAgentFunc type is an adapter to allow the use of ordinary
// function as AllocAgent mutator.
type AllocAgentFunc func(context.Context, *ent.AllocAgentMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f AllocAgentFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.AllocAgentMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.AllocAgentMutation", m)
}

// The BatchMsgFunc type is an adapter to allow the use of ordinary
// function as BatchMsg mutator.
type BatchMsgFunc func(context.Context, *ent.BatchMsgMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f BatchMsgFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.BatchMsgMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.BatchMsgMutation", m)
}

// The CategoryFunc type is an adapter to allow the use of ordinary
// function as Category mutator.
type CategoryFunc func(context.Context, *ent.CategoryMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f CategoryFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.CategoryMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.CategoryMutation", m)
}

// The ChatRecordsFunc type is an adapter to allow the use of ordinary
// function as ChatRecords mutator.
type ChatRecordsFunc func(context.Context, *ent.ChatRecordsMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f ChatRecordsFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.ChatRecordsMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.ChatRecordsMutation", m)
}

// The ChatSessionFunc type is an adapter to allow the use of ordinary
// function as ChatSession mutator.
type ChatSessionFunc func(context.Context, *ent.ChatSessionMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f ChatSessionFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.ChatSessionMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.ChatSessionMutation", m)
}

// The ContactFunc type is an adapter to allow the use of ordinary
// function as Contact mutator.
type ContactFunc func(context.Context, *ent.ContactMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f ContactFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.ContactMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.ContactMutation", m)
}

// The CreditBalanceFunc type is an adapter to allow the use of ordinary
// function as CreditBalance mutator.
type CreditBalanceFunc func(context.Context, *ent.CreditBalanceMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f CreditBalanceFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.CreditBalanceMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.CreditBalanceMutation", m)
}

// The CreditUsageFunc type is an adapter to allow the use of ordinary
// function as CreditUsage mutator.
type CreditUsageFunc func(context.Context, *ent.CreditUsageMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f CreditUsageFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.CreditUsageMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.CreditUsageMutation", m)
}

// The EmployeeFunc type is an adapter to allow the use of ordinary
// function as Employee mutator.
type EmployeeFunc func(context.Context, *ent.EmployeeMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f EmployeeFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.EmployeeMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.EmployeeMutation", m)
}

// The EmployeeConfigFunc type is an adapter to allow the use of ordinary
// function as EmployeeConfig mutator.
type EmployeeConfigFunc func(context.Context, *ent.EmployeeConfigMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f EmployeeConfigFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.EmployeeConfigMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.EmployeeConfigMutation", m)
}

// The LabelFunc type is an adapter to allow the use of ordinary
// function as Label mutator.
type LabelFunc func(context.Context, *ent.LabelMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f LabelFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.LabelMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.LabelMutation", m)
}

// The LabelRelationshipFunc type is an adapter to allow the use of ordinary
// function as LabelRelationship mutator.
type LabelRelationshipFunc func(context.Context, *ent.LabelRelationshipMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f LabelRelationshipFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.LabelRelationshipMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.LabelRelationshipMutation", m)
}

// The LabelTaggingFunc type is an adapter to allow the use of ordinary
// function as LabelTagging mutator.
type LabelTaggingFunc func(context.Context, *ent.LabelTaggingMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f LabelTaggingFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.LabelTaggingMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.LabelTaggingMutation", m)
}

// The MessageFunc type is an adapter to allow the use of ordinary
// function as Message mutator.
type MessageFunc func(context.Context, *ent.MessageMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f MessageFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.MessageMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.MessageMutation", m)
}

// The MessageRecordsFunc type is an adapter to allow the use of ordinary
// function as MessageRecords mutator.
type MessageRecordsFunc func(context.Context, *ent.MessageRecordsMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f MessageRecordsFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.MessageRecordsMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.MessageRecordsMutation", m)
}

// The MsgFunc type is an adapter to allow the use of ordinary
// function as Msg mutator.
type MsgFunc func(context.Context, *ent.MsgMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f MsgFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.MsgMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.MsgMutation", m)
}

// The PayRechargeFunc type is an adapter to allow the use of ordinary
// function as PayRecharge mutator.
type PayRechargeFunc func(context.Context, *ent.PayRechargeMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f PayRechargeFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.PayRechargeMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.PayRechargeMutation", m)
}

// The ServerFunc type is an adapter to allow the use of ordinary
// function as Server mutator.
type ServerFunc func(context.Context, *ent.ServerMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f ServerFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.ServerMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.ServerMutation", m)
}

// The SopNodeFunc type is an adapter to allow the use of ordinary
// function as SopNode mutator.
type SopNodeFunc func(context.Context, *ent.SopNodeMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f SopNodeFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.SopNodeMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.SopNodeMutation", m)
}

// The SopStageFunc type is an adapter to allow the use of ordinary
// function as SopStage mutator.
type SopStageFunc func(context.Context, *ent.SopStageMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f SopStageFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.SopStageMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.SopStageMutation", m)
}

// The SopTaskFunc type is an adapter to allow the use of ordinary
// function as SopTask mutator.
type SopTaskFunc func(context.Context, *ent.SopTaskMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f SopTaskFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.SopTaskMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.SopTaskMutation", m)
}

// The TokenFunc type is an adapter to allow the use of ordinary
// function as Token mutator.
type TokenFunc func(context.Context, *ent.TokenMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f TokenFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.TokenMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.TokenMutation", m)
}

// The TutorialFunc type is an adapter to allow the use of ordinary
// function as Tutorial mutator.
type TutorialFunc func(context.Context, *ent.TutorialMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f TutorialFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.TutorialMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.TutorialMutation", m)
}

// The UsageDetailFunc type is an adapter to allow the use of ordinary
// function as UsageDetail mutator.
type UsageDetailFunc func(context.Context, *ent.UsageDetailMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f UsageDetailFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.UsageDetailMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.UsageDetailMutation", m)
}

// The UsageStatisticDayFunc type is an adapter to allow the use of ordinary
// function as UsageStatisticDay mutator.
type UsageStatisticDayFunc func(context.Context, *ent.UsageStatisticDayMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f UsageStatisticDayFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.UsageStatisticDayMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.UsageStatisticDayMutation", m)
}

// The UsageStatisticHourFunc type is an adapter to allow the use of ordinary
// function as UsageStatisticHour mutator.
type UsageStatisticHourFunc func(context.Context, *ent.UsageStatisticHourMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f UsageStatisticHourFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.UsageStatisticHourMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.UsageStatisticHourMutation", m)
}

// The UsageStatisticMonthFunc type is an adapter to allow the use of ordinary
// function as UsageStatisticMonth mutator.
type UsageStatisticMonthFunc func(context.Context, *ent.UsageStatisticMonthMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f UsageStatisticMonthFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.UsageStatisticMonthMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.UsageStatisticMonthMutation", m)
}

// The UsageTotalFunc type is an adapter to allow the use of ordinary
// function as UsageTotal mutator.
type UsageTotalFunc func(context.Context, *ent.UsageTotalMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f UsageTotalFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.UsageTotalMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.UsageTotalMutation", m)
}

// The WhatsappFunc type is an adapter to allow the use of ordinary
// function as Whatsapp mutator.
type WhatsappFunc func(context.Context, *ent.WhatsappMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WhatsappFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WhatsappMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WhatsappMutation", m)
}

// The WhatsappChannelFunc type is an adapter to allow the use of ordinary
// function as WhatsappChannel mutator.
type WhatsappChannelFunc func(context.Context, *ent.WhatsappChannelMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WhatsappChannelFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WhatsappChannelMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WhatsappChannelMutation", m)
}

// The WorkExperienceFunc type is an adapter to allow the use of ordinary
// function as WorkExperience mutator.
type WorkExperienceFunc func(context.Context, *ent.WorkExperienceMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WorkExperienceFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WorkExperienceMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WorkExperienceMutation", m)
}

// The WpChatroomFunc type is an adapter to allow the use of ordinary
// function as WpChatroom mutator.
type WpChatroomFunc func(context.Context, *ent.WpChatroomMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WpChatroomFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WpChatroomMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WpChatroomMutation", m)
}

// The WpChatroomMemberFunc type is an adapter to allow the use of ordinary
// function as WpChatroomMember mutator.
type WpChatroomMemberFunc func(context.Context, *ent.WpChatroomMemberMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WpChatroomMemberFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WpChatroomMemberMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WpChatroomMemberMutation", m)
}

// The WxFunc type is an adapter to allow the use of ordinary
// function as Wx mutator.
type WxFunc func(context.Context, *ent.WxMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WxFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WxMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WxMutation", m)
}

// The WxCardFunc type is an adapter to allow the use of ordinary
// function as WxCard mutator.
type WxCardFunc func(context.Context, *ent.WxCardMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WxCardFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WxCardMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WxCardMutation", m)
}

// The WxCardUserFunc type is an adapter to allow the use of ordinary
// function as WxCardUser mutator.
type WxCardUserFunc func(context.Context, *ent.WxCardUserMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WxCardUserFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WxCardUserMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WxCardUserMutation", m)
}

// The WxCardVisitFunc type is an adapter to allow the use of ordinary
// function as WxCardVisit mutator.
type WxCardVisitFunc func(context.Context, *ent.WxCardVisitMutation) (ent.Value, error)

// Mutate calls f(ctx, m).
func (f WxCardVisitFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
	if mv, ok := m.(*ent.WxCardVisitMutation); ok {
		return f(ctx, mv)
	}
	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.WxCardVisitMutation", m)
}

// Condition is a hook condition function.
type Condition func(context.Context, ent.Mutation) bool

// And groups conditions with the AND operator.
func And(first, second Condition, rest ...Condition) Condition {
	return func(ctx context.Context, m ent.Mutation) bool {
		if !first(ctx, m) || !second(ctx, m) {
			return false
		}
		for _, cond := range rest {
			if !cond(ctx, m) {
				return false
			}
		}
		return true
	}
}

// Or groups conditions with the OR operator.
func Or(first, second Condition, rest ...Condition) Condition {
	return func(ctx context.Context, m ent.Mutation) bool {
		if first(ctx, m) || second(ctx, m) {
			return true
		}
		for _, cond := range rest {
			if cond(ctx, m) {
				return true
			}
		}
		return false
	}
}

// Not negates a given condition.
func Not(cond Condition) Condition {
	return func(ctx context.Context, m ent.Mutation) bool {
		return !cond(ctx, m)
	}
}

// HasOp is a condition testing mutation operation.
func HasOp(op ent.Op) Condition {
	return func(_ context.Context, m ent.Mutation) bool {
		return m.Op().Is(op)
	}
}

// HasAddedFields is a condition validating `.AddedField` on fields.
func HasAddedFields(field string, fields ...string) Condition {
	return func(_ context.Context, m ent.Mutation) bool {
		if _, exists := m.AddedField(field); !exists {
			return false
		}
		for _, field := range fields {
			if _, exists := m.AddedField(field); !exists {
				return false
			}
		}
		return true
	}
}

// HasClearedFields is a condition validating `.FieldCleared` on fields.
func HasClearedFields(field string, fields ...string) Condition {
	return func(_ context.Context, m ent.Mutation) bool {
		if exists := m.FieldCleared(field); !exists {
			return false
		}
		for _, field := range fields {
			if exists := m.FieldCleared(field); !exists {
				return false
			}
		}
		return true
	}
}

// HasFields is a condition validating `.Field` on fields.
func HasFields(field string, fields ...string) Condition {
	return func(_ context.Context, m ent.Mutation) bool {
		if _, exists := m.Field(field); !exists {
			return false
		}
		for _, field := range fields {
			if _, exists := m.Field(field); !exists {
				return false
			}
		}
		return true
	}
}

// If executes the given hook under condition.
//
//	hook.If(ComputeAverage, And(HasFields(...), HasAddedFields(...)))
func If(hk ent.Hook, cond Condition) ent.Hook {
	return func(next ent.Mutator) ent.Mutator {
		return ent.MutateFunc(func(ctx context.Context, m ent.Mutation) (ent.Value, error) {
			if cond(ctx, m) {
				return hk(next).Mutate(ctx, m)
			}
			return next.Mutate(ctx, m)
		})
	}
}

// On executes the given hook only for the given operation.
//
//	hook.On(Log, ent.Delete|ent.Create)
func On(hk ent.Hook, op ent.Op) ent.Hook {
	return If(hk, HasOp(op))
}

// Unless skips the given hook only for the given operation.
//
//	hook.Unless(Log, ent.Update|ent.UpdateOne)
func Unless(hk ent.Hook, op ent.Op) ent.Hook {
	return If(hk, Not(HasOp(op)))
}

// FixedError is a hook returning a fixed error.
func FixedError(err error) ent.Hook {
	return func(ent.Mutator) ent.Mutator {
		return ent.MutateFunc(func(context.Context, ent.Mutation) (ent.Value, error) {
			return nil, err
		})
	}
}

// Reject returns a hook that rejects all operations that match op.
//
//	func (T) Hooks() []ent.Hook {
//		return []ent.Hook{
//			Reject(ent.Delete|ent.Update),
//		}
//	}
func Reject(op ent.Op) ent.Hook {
	hk := FixedError(fmt.Errorf("%s operation is not allowed", op))
	return On(hk, op)
}

// Chain acts as a list of hooks and is effectively immutable.
// Once created, it will always hold the same set of hooks in the same order.
type Chain struct {
	hooks []ent.Hook
}

// NewChain creates a new chain of hooks.
func NewChain(hooks ...ent.Hook) Chain {
	return Chain{append([]ent.Hook(nil), hooks...)}
}

// Hook chains the list of hooks and returns the final hook.
func (c Chain) Hook() ent.Hook {
	return func(mutator ent.Mutator) ent.Mutator {
		for i := len(c.hooks) - 1; i >= 0; i-- {
			mutator = c.hooks[i](mutator)
		}
		return mutator
	}
}

// Append extends a chain, adding the specified hook
// as the last ones in the mutation flow.
func (c Chain) Append(hooks ...ent.Hook) Chain {
	newHooks := make([]ent.Hook, 0, len(c.hooks)+len(hooks))
	newHooks = append(newHooks, c.hooks...)
	newHooks = append(newHooks, hooks...)
	return Chain{newHooks}
}

// Extend extends a chain, adding the specified chain
// as the last ones in the mutation flow.
func (c Chain) Extend(chain Chain) Chain {
	return c.Append(chain.hooks...)
}