package grpc

import (
	"context"

	userv1 "hyapp.local/api/proto/user/v1"
	"hyapp/pkg/xerr"
	cpdomain "hyapp/services/user-service/internal/domain/cp"
)

// ListCPApplications 返回当前用户收到或发出的 CP/兄弟/姐妹申请。
func (s *Server) ListCPApplications(ctx context.Context, req *userv1.ListCPApplicationsRequest) (*userv1.ListCPApplicationsResponse, error) {
	ctx = contextWithApp(ctx, req.GetMeta())
	if s.cpSvc == nil {
		return nil, xerr.ToGRPCError(xerr.New(xerr.Unavailable, "cp service is not configured"))
	}
	// gRPC 层只透传分页、方向和状态，pending 过期固化由 service/repository 统一处理。
	applications, total, serverTimeMS, err := s.cpSvc.ListApplications(ctx, req.GetUserId(), req.GetDirection(), req.GetStatus(), req.GetPage(), req.GetPageSize())
	if err != nil {
		return nil, xerr.ToGRPCError(err)
	}
	resp := &userv1.ListCPApplicationsResponse{
		Applications: make([]*userv1.CPApplication, 0, len(applications)),
		Total:        total,
		ServerTimeMs: serverTimeMS,
	}
	for _, application := range applications {
		resp.Applications = append(resp.Applications, toProtoCPApplication(application))
	}
	return resp, nil
}

// AcceptCPApplication 同意申请并返回建立后的关系。
func (s *Server) AcceptCPApplication(ctx context.Context, req *userv1.AcceptCPApplicationRequest) (*userv1.AcceptCPApplicationResponse, error) {
	ctx = contextWithApp(ctx, req.GetMeta())
	if s.cpSvc == nil {
		return nil, xerr.ToGRPCError(xerr.New(xerr.Unavailable, "cp service is not configured"))
	}
	application, relationship, err := s.cpSvc.AcceptApplication(ctx, req.GetUserId(), req.GetApplicationId())
	if err != nil {
		return nil, xerr.ToGRPCError(err)
	}
	return &userv1.AcceptCPApplicationResponse{
		Application:  toProtoCPApplication(application),
		Relationship: toProtoCPRelationship(relationship),
	}, nil
}

// RejectCPApplication 拒绝申请；拒绝原因只进入 outbox payload，不改变关系主事实。
func (s *Server) RejectCPApplication(ctx context.Context, req *userv1.RejectCPApplicationRequest) (*userv1.RejectCPApplicationResponse, error) {
	ctx = contextWithApp(ctx, req.GetMeta())
	if s.cpSvc == nil {
		return nil, xerr.ToGRPCError(xerr.New(xerr.Unavailable, "cp service is not configured"))
	}
	application, err := s.cpSvc.RejectApplication(ctx, req.GetUserId(), req.GetApplicationId(), req.GetReason())
	if err != nil {
		return nil, xerr.ToGRPCError(err)
	}
	return &userv1.RejectCPApplicationResponse{Application: toProtoCPApplication(application)}, nil
}

// ListCPRelationships 返回用户 active 关系；当前每个用户最多同时拥有一条关系。
func (s *Server) ListCPRelationships(ctx context.Context, req *userv1.ListCPRelationshipsRequest) (*userv1.ListCPRelationshipsResponse, error) {
	ctx = contextWithApp(ctx, req.GetMeta())
	if s.cpSvc == nil {
		return nil, xerr.ToGRPCError(xerr.New(xerr.Unavailable, "cp service is not configured"))
	}
	relationships, total, err := s.cpSvc.ListRelationships(ctx, req.GetUserId(), req.GetRelationType(), req.GetPage(), req.GetPageSize())
	if err != nil {
		return nil, xerr.ToGRPCError(err)
	}
	resp := &userv1.ListCPRelationshipsResponse{
		Relationships: make([]*userv1.CPRelationship, 0, len(relationships)),
		Total:         total,
	}
	for _, relationship := range relationships {
		resp.Relationships = append(resp.Relationships, toProtoCPRelationship(relationship))
	}
	return resp, nil
}

// ConsumeRoomGiftCPEvent 由 user-service 内部 MQ worker 调用，把 RoomGiftSent 转为 CP 申请或亲密值增长。
func (s *Server) ConsumeRoomGiftCPEvent(ctx context.Context, req *userv1.ConsumeRoomGiftCPEventRequest) (*userv1.ConsumeRoomGiftCPEventResponse, error) {
	ctx = contextWithApp(ctx, req.GetMeta())
	if s.cpSvc == nil {
		return nil, xerr.ToGRPCError(xerr.New(xerr.Unavailable, "cp service is not configured"))
	}
	event := req.GetEvent()
	result, err := s.cpSvc.ConsumeGiftEvent(ctx, cpdomain.GiftEvent{
		EventID:          event.GetEventId(),
		RoomID:           event.GetRoomId(),
		RoomVersion:      event.GetRoomVersion(),
		OccurredAtMS:     event.GetOccurredAtMs(),
		SenderUserID:     event.GetSenderUserId(),
		TargetUserID:     event.GetTargetUserId(),
		GiftID:           event.GetGiftId(),
		GiftCount:        event.GetGiftCount(),
		GiftValue:        event.GetGiftValue(),
		BillingReceiptID: event.GetBillingReceiptId(),
		VisibleRegionID:  event.GetVisibleRegionId(),
		CommandID:        event.GetCommandId(),
		GiftTypeCode:     event.GetGiftTypeCode(),
		CPRelationType:   event.GetCpRelationType(),
		GiftName:         event.GetGiftName(),
		GiftIconURL:      event.GetGiftIconUrl(),
		GiftAnimationURL: event.GetGiftAnimationUrl(),
	})
	if err != nil {
		return nil, xerr.ToGRPCError(err)
	}
	return &userv1.ConsumeRoomGiftCPEventResponse{
		Consumed:     result.Consumed,
		Application:  toProtoCPApplication(result.Application),
		Relationship: toProtoCPRelationship(result.Relationship),
	}, nil
}

func toProtoCPApplication(application cpdomain.Application) *userv1.CPApplication {
	if application.ApplicationID == "" {
		return nil
	}
	return &userv1.CPApplication{
		ApplicationId: application.ApplicationID,
		RelationType:  application.RelationType,
		Status:        application.Status,
		Requester:     toProtoCPUserProfile(application.Requester),
		Target:        toProtoCPUserProfile(application.Target),
		RoomId:        application.RoomID,
		RoomRegionId:  application.RoomRegionID,
		Gift:          toProtoCPGiftSnapshot(application.Gift),
		CreatedAtMs:   application.CreatedAtMS,
		UpdatedAtMs:   application.UpdatedAtMS,
		ExpiresAtMs:   application.ExpiresAtMS,
		DecidedAtMs:   application.DecidedAtMS,
	}
}

func toProtoCPRelationship(relationship cpdomain.Relationship) *userv1.CPRelationship {
	if relationship.RelationshipID == "" {
		return nil
	}
	return &userv1.CPRelationship{
		RelationshipId: relationship.RelationshipID,
		RelationType:   relationship.RelationType,
		Status:         relationship.Status,
		Me:             toProtoCPUserProfile(relationship.Me),
		Partner:        toProtoCPUserProfile(relationship.Partner),
		IntimacyValue:  relationship.IntimacyValue,
		Level:          relationship.Level,
		FormedAtMs:     relationship.FormedAtMS,
		UpdatedAtMs:    relationship.UpdatedAtMS,
	}
}

func toProtoCPUserProfile(profile cpdomain.UserProfile) *userv1.CPUserProfile {
	if profile.UserID <= 0 {
		return nil
	}
	return &userv1.CPUserProfile{
		UserId:        profile.UserID,
		DisplayUserId: profile.DisplayUserID,
		Username:      profile.Username,
		Avatar:        profile.Avatar,
	}
}

func toProtoCPGiftSnapshot(gift cpdomain.GiftSnapshot) *userv1.CPGiftSnapshot {
	if gift.GiftID == "" && gift.GiftName == "" {
		return nil
	}
	return &userv1.CPGiftSnapshot{
		GiftId:           gift.GiftID,
		GiftName:         gift.GiftName,
		GiftIconUrl:      gift.GiftIconURL,
		GiftAnimationUrl: gift.GiftAnimationURL,
		GiftCount:        gift.GiftCount,
		GiftValue:        gift.GiftValue,
		BillingReceiptId: gift.BillingReceiptID,
	}
}