package feedback

import (
	"context"
	"tm/internal/tender"
	"tm/pkg/logger"
	"tm/pkg/response"
)

// FeedbackService interface defines feedback business logic methods
type FeedbackService interface {
	ToggleFeedback(ctx context.Context, req ToggleFeedbackForm, customerID *string, companyID *string) (*FeedbackResponse, error)
	GetFeedback(ctx context.Context, id string) (*FeedbackResponse, error)
	ListFeedback(ctx context.Context, criteria FeedbackSearchCriteria, limit, offset int) (*FeedbackListWithTenderResponse, error)
	DeleteFeedback(ctx context.Context, id string) error
	GetFeedbackByTenderID(ctx context.Context, tenderID, companyID string) (*FeedbackResponse, error)
	CompanyFeedbackStats(ctx context.Context, companyID string) (*CompanyFeedbackStatsResponse, error)
}

// feedbackService implements FeedbackService interface
type feedbackService struct {
	feedbackRepo  Repository
	tenderService tender.Service
	logger        logger.Logger
}

// NewFeedbackService creates a new feedback service
func NewFeedbackService(feedbackRepo Repository, tenderService tender.Service, logger logger.Logger) FeedbackService {
	return &feedbackService{
		feedbackRepo:  feedbackRepo,
		tenderService: tenderService,
		logger:        logger,
	}
}

func (s *feedbackService) ToggleFeedback(ctx context.Context, req ToggleFeedbackForm, customerID *string, companyID *string) (*FeedbackResponse, error) {
	existing, err := s.feedbackRepo.GetByCompanyID(ctx, *companyID, req.TenderID)

	if err != nil {
		feedback := &Feedback{
			TenderID:     req.TenderID,
			FeedbackType: req.FeedbackType,
			CompanyID:    companyID,
			CustomerID:   customerID,
		}

		err = s.feedbackRepo.Create(ctx, feedback)
		if err != nil {
			s.logger.Error("Failed to create new feedback", map[string]interface{}{
				"tender_id":  req.TenderID,
				"company_id": *companyID,
				"error":      err.Error(),
			})
			return nil, err
		}

		return feedback.ToResponse(), nil
	}

	if existing.FeedbackType == req.FeedbackType {
		err = s.feedbackRepo.Delete(ctx, existing.GetID())
		if err != nil {
			s.logger.Error("Failed to update existing feedback", map[string]interface{}{
				"feedback_id": existing.GetID(),
				"tender_id":   req.TenderID,
				"company_id":  *companyID,
				"error":       err.Error(),
			})
			return nil, err
		}

		if req.FeedbackType == FeedbackTypeLike {
			existing.FeedbackType = "unlike"
		} else {
			existing.FeedbackType = "undislike"
		}

		return existing.ToResponse(), nil
	}

	if existing.FeedbackType == FeedbackTypeLike {
		existing.FeedbackType = FeedbackTypeDislike
	} else {
		existing.FeedbackType = FeedbackTypeLike
	}

	err = s.feedbackRepo.Update(ctx, existing)
	if err != nil {
		s.logger.Error("Failed to update existing feedback", map[string]interface{}{
			"feedback_id": existing.GetID(),
			"tender_id":   req.TenderID,
			"company_id":  *companyID,
			"error":       err.Error(),
		})
		return nil, err
	}

	return existing.ToResponse(), nil
}

func (s *feedbackService) GetFeedback(ctx context.Context, id string) (*FeedbackResponse, error) {
	feedback, err := s.feedbackRepo.GetByID(ctx, id)
	if err != nil {
		s.logger.Error("Failed to get feedback", map[string]interface{}{
			"id":    id,
			"error": err.Error(),
		})
		return nil, err
	}

	return feedback.ToResponse(), nil
}

func (s *feedbackService) ListFeedback(ctx context.Context, criteria FeedbackSearchCriteria, limit, offset int) (*FeedbackListWithTenderResponse, error) {
	feedbacks, total, err := s.feedbackRepo.List(ctx, criteria, limit, offset)
	if err != nil {
		s.logger.Error("Failed to list feedback", map[string]interface{}{
			"criteria": criteria,
			"limit":    limit,
			"offset":   offset,
			"error":    err.Error(),
		})
		return nil, err
	}

	meta := &response.Meta{
		Total:  int(total),
		Limit:  limit,
		Offset: offset,
		Page:   (offset / limit) + 1,
		Pages:  int((total + int64(limit) - 1) / int64(limit)),
	}

	result := make([]*FeedbackWithTenderResponse, len(feedbacks))
	for i, feedback := range feedbacks {
		tender, err := s.tenderService.GetByID(ctx, feedback.TenderID)
		if err != nil {
			s.logger.Error("Failed to get tender", map[string]interface{}{
				"tender_id": feedback.TenderID,
				"error":     err.Error(),
			})
			return nil, err
		}
		resp := feedback.ToResponseWithTender(&tenderDetails{
			ID:                  tender.ID,
			NoticePublicationID: tender.NoticePublicationID,
			PublicationDate:     tender.PublicationDate,
			Title:               tender.Title,
			Description:         tender.Description,
			ProcurementTypeCode: tender.ProcurementTypeCode,
			ProcedureCode:       tender.ProcedureCode,
			EstimatedValue:      tender.EstimatedValue,
			Currency:            tender.Currency,
			Duration:            tender.Duration,
			DurationUnit:        tender.DurationUnit,
			TenderDeadline:      tender.TenderDeadline,
			SubmissionDeadline:  tender.SubmissionDeadline,
			CountryCode:         tender.CountryCode,
			BuyerOrganization:   &organizationResponse{Name: tender.BuyerOrganization.Name},
			Status:              string(tender.Status),
		})
		result[i] = resp
	}
	return &FeedbackListWithTenderResponse{
		Feedback: result,
		Meta:     meta,
	}, nil
}

func (s *feedbackService) DeleteFeedback(ctx context.Context, id string) error {
	return s.feedbackRepo.Delete(ctx, id)
}

func (s *feedbackService) GetFeedbackByTenderID(ctx context.Context, tenderID, companyID string) (*FeedbackResponse, error) {
	feedback, err := s.feedbackRepo.GetByTenderID(ctx, tenderID, companyID)
	if err != nil {
		s.logger.Error("Failed to get feedback by tender ID", map[string]interface{}{
			"tender_id": tenderID,
			"error":     err.Error(),
		})
		return nil, err
	}
	return feedback.ToResponse(), nil
}

func (s *feedbackService) CompanyFeedbackStats(ctx context.Context, companyID string) (*CompanyFeedbackStatsResponse, error) {
	s.logger.Info("Getting company feedback statistics", map[string]interface{}{
		"company_id": companyID,
	})

	stats, err := s.feedbackRepo.GetCompanyFeedbackStats(ctx, companyID)
	if err != nil {
		s.logger.Error("Failed to get company feedback statistics", map[string]interface{}{
			"company_id": companyID,
			"error":      err.Error(),
		})
		return nil, err
	}

	s.logger.Info("Company feedback statistics retrieved successfully", map[string]interface{}{
		"company_id":     companyID,
		"total_feedback": stats.TotalFeedback,
		"total_likes":    stats.TotalLikes,
		"total_dislikes": stats.TotalDislikes,
	})

	return stats, nil
}