package services

import (
	"codeword/internal/kafka/tariff"
	"codeword/internal/models"
	"codeword/internal/utils/genID"
	"context"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.uber.org/zap"
)

type PromoCodeRepository interface {
	CreatePromoCode(ctx context.Context, req *models.PromoCode) (*models.PromoCode, error)
	EditPromoCode(ctx context.Context, req *models.ReqEditPromoCode) (*models.PromoCode, error)
	GetPromoCodesList(ctx context.Context, req *models.GetPromoCodesListReq) ([]models.PromoCode, int64, error)
	ActivatePromo(ctx context.Context, req *models.ActivateReq) (*models.PromoCode, error)
	DeletePromoCode(ctx context.Context, promoCodeID string) error
	GetPromoCodeByID(ctx context.Context, promoCodeID primitive.ObjectID) (*models.PromoCode, error)
	AddFastLink(ctx context.Context, promoCodeID primitive.ObjectID, xid string) error
}

type PromoDeps struct {
	Logger        *zap.Logger
	PromoCodeRepo PromoCodeRepository
	Kafka         *tariff.Producer
}

type PromoCodeService struct {
	logger        *zap.Logger
	promoCodeRepo PromoCodeRepository
	kafka         *tariff.Producer
}

func NewPromoCodeService(deps PromoDeps) *PromoCodeService {
	return &PromoCodeService{
		logger:        deps.Logger,
		promoCodeRepo: deps.PromoCodeRepo,
		kafka:         deps.Kafka,
	}
}

func (s *PromoCodeService) CreatePromoCode(ctx context.Context, req *models.PromoCode) (*models.PromoCode, error) {
	promoCode, err := s.promoCodeRepo.CreatePromoCode(ctx, req)
	if err != nil {
		s.logger.Error("Failed to add promocode in database", zap.Error(err))
		return nil, err
	}

	return promoCode, nil
}

func (s *PromoCodeService) EditPromoCode(ctx context.Context, req *models.ReqEditPromoCode) (*models.PromoCode, error) {
	editedPromoCode, err := s.promoCodeRepo.EditPromoCode(ctx, req)
	if err != nil {
		s.logger.Error("Failed to edit promocode in database", zap.Error(err))
		return nil, err
	}

	return editedPromoCode, nil
}

func (s *PromoCodeService) GetPromoCodesList(ctx context.Context, req *models.GetPromoCodesListReq) ([]models.PromoCode, int64, error) {
	promoCodes, count, err := s.promoCodeRepo.GetPromoCodesList(ctx, req)
	if err != nil {
		s.logger.Error("Failed to get list promocodes from database", zap.Error(err))
		return nil, 0, err
	}

	return promoCodes, count, nil
}

func (s *PromoCodeService) ActivatePromo(ctx context.Context, req *models.ActivateReq) (string, error) {
	promoCode, err := s.promoCodeRepo.ActivatePromo(ctx, req)
	if err != nil {
		s.logger.Error("Failed to activate promocode", zap.Error(err))
		return "", err
	}

	var privileges []models.Privilege
	privilege := models.Privilege{
		PrivilegeID: promoCode.Bonus.Privilege.PrivilegeID,
		Amount:      promoCode.Bonus.Privilege.Amount,
	}
	privileges = append(privileges, privilege)

	// создание fake tariff
	fakeTariff := &models.Tariff{
		Name:       promoCode.Codeword, // используем codeword как имя тарифа
		Privileges: privileges,
		Deleted:    promoCode.Delete,
		CreatedAt:  promoCode.CreatedAt,
	}
	if err := s.kafka.Send(ctx, req.UserID, fakeTariff); err != nil {
		s.logger.Error("Failed to send fake tariff to Kafka", zap.Error(err))
		return "", err
	}

	// код для вызова gRPC service для создания скидки...

	return promoCode.Greetings, nil
}

func (s *PromoCodeService) DeletePromoCode(ctx context.Context, promoCodeID string) error {
	err := s.promoCodeRepo.DeletePromoCode(ctx, promoCodeID)
	if err != nil {
		s.logger.Error("Failed simple delete promocode from database", zap.Error(err))
		return err
	}

	return nil
}

func (s *PromoCodeService) CreateFastLink(ctx context.Context, promoCodeID string) (string, error) {
	xid := genID.GenerateXID()
	promoID, err := primitive.ObjectIDFromHex(promoCodeID)
	if err != nil {
		s.logger.Error("Failed conversion promoCodeID to ObjectID", zap.Error(err))
		return "", err
	}

	err = s.promoCodeRepo.AddFastLink(ctx, promoID, xid)
	if err != nil {
		s.logger.Error("Failed to add fastlink for promocode by promocode id", zap.Error(err))
		return "", err
	}

	return xid, nil
}