package service

import (
	"context"
	"errors"
	"time"

	"github.com/topfans/backend/pkg/models"
	pb "github.com/topfans/backend/pkg/proto/moderation"
	"github.com/topfans/backend/services/moderationService/client"
	"github.com/topfans/backend/services/moderationService/config"
	"github.com/topfans/backend/services/moderationService/repository"
)

type FeedbackService struct {
	repo        *repository.ModerationRepository
	category    *CategoryService
	notifClient *client.NotificationClient
	cfg         config.ModerationConfig
}

func NewFeedbackService(
	repo *repository.ModerationRepository,
	category *CategoryService,
	notifClient *client.NotificationClient,
	cfg config.ModerationConfig,
) *FeedbackService {
	return &FeedbackService{repo: repo, category: category, notifClient: notifClient, cfg: cfg}
}

func (s *FeedbackService) SubmitFeedback(ctx context.Context, req *pb.SubmitFeedbackRequest) (*pb.SubmitFeedbackResponse, error) {
	now := time.Now().UnixMilli()

	// 验证分类启用
	enabled, err := s.category.IsFeedbackCategoryEnabled(ctx, req.CategoryCode)
	if err != nil {
		return nil, err
	}
	if !enabled {
		return nil, ErrFeedbackCatInvalid
	}
	if len(req.Title) > 100 {
		return nil, ErrDescriptionTooLong
	}
	if len(req.Contact) > s.cfg.MaxContactLen {
		return nil, ErrDescriptionTooLong
	}
	if len(req.EvidenceKeys) > s.cfg.MaxEvidenceCount {
		return nil, ErrTooManyEvidence
	}

	feedback := &models.Feedback{
		UserID:       req.UserId,
		CategoryCode: req.CategoryCode,
		Title:        req.Title,
		Content:      req.Content,
		IsAnonymous:  req.IsAnonymous,
		Status:       "pending",
		ClaimedBy:    nil,
		ClaimedAt:    nil,
		CreatedAt:    now,
		UpdatedAt:    now,
	}
	if req.StarId > 0 {
		sid := req.StarId
		feedback.StarID = &sid
	}
	if req.Contact != "" {
		c := req.Contact
		feedback.Contact = &c
	}

	if err := s.repo.CreateFeedback(ctx, feedback); err != nil {
		return nil, err
	}

	for i, key := range req.EvidenceKeys {
		ev := &models.FeedbackEvidence{
			FeedbackID: feedback.ID,
			OSSKey:     key,
			SortOrder:  int32(i),
			CreatedAt:  now,
		}
		if err := s.repo.CreateFeedbackEvidence(ctx, ev); err != nil {
			return nil, err
		}
	}

	return &pb.SubmitFeedbackResponse{
		FeedbackId: feedback.ID,
		Status:     feedback.Status,
		ClaimedBy:  0,
		ClaimedAt:  0,
		CreatedAt:  feedback.CreatedAt,
	}, nil
}

func (s *FeedbackService) ListMyFeedbacks(ctx context.Context, req *pb.ListMyFeedbacksRequest) (*pb.ListMyFeedbacksResponse, error) {
	page := int(req.Page)
	if page < 1 {
		page = 1
	}
	pageSize := int(req.PageSize)
	if pageSize < 1 || pageSize > 100 {
		pageSize = 20
	}
	fbs, total, err := s.repo.ListMyFeedbacks(ctx, req.UserId, req.Status, page, pageSize)
	if err != nil {
		return nil, err
	}
	resp := &pb.ListMyFeedbacksResponse{Total: int32(total)}
	for _, fb := range fbs {
		item := &pb.FeedbackSummary{
			Id:           fb.ID,
			CategoryCode: fb.CategoryCode,
			Title:        fb.Title,
			Status:       fb.Status,
			CreatedAt:    fb.CreatedAt,
		}
		if fb.RepliedAt != nil {
			item.RepliedAt = *fb.RepliedAt
		}
		resp.Feedbacks = append(resp.Feedbacks, item)
	}
	return resp, nil
}

func (s *FeedbackService) GetFeedback(ctx context.Context, req *pb.GetFeedbackRequest) (*pb.GetFeedbackResponse, error) {
	fb, err := s.repo.GetFeedbackByID(ctx, req.Id)
	if err != nil {
		return nil, ErrReportNotFound
	}
	if fb.UserID != req.UserId {
		return nil, ErrReportNotFound
	}
	resp := &pb.GetFeedbackResponse{
		Feedback: &pb.FeedbackSummary{
			Id:           fb.ID,
			CategoryCode: fb.CategoryCode,
			Title:        fb.Title,
			Status:       fb.Status,
			CreatedAt:    fb.CreatedAt,
		},
		Content: fb.Content,
	}
	if fb.ReplyContent != nil {
		resp.ReplyContent = *fb.ReplyContent
	}
	if fb.RepliedAt != nil {
		resp.Feedback.RepliedAt = *fb.RepliedAt
	}
	evs, _ := s.repo.GetFeedbackEvidence(ctx, fb.ID)
	for _, ev := range evs {
		item := &pb.EvidenceSummary{OssKey: ev.OSSKey}
		if ev.OSSURL != nil {
			item.OssUrl = *ev.OSSURL
		}
		resp.Evidence = append(resp.Evidence, item)
	}
	return resp, nil
}

// avoid unused import warning
var _ = errors.New