package logic

import (
	"context"

	"spark-server/internal/module/favorite/entity"
	msgentity "spark-server/internal/module/message/entity"
	"spark-server/internal/pkg/errs"
)

type ListResult struct {
	Items []*Item `json:"items"`
}

func (s *Service) List(ctx context.Context, userID int64, limit int) (*ListResult, error) {
	if !s.ready() || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	rows, err := s.repo.ListByUser(ctx, userID, entity.ClampLimit(limit))
	if err != nil {
		return nil, err
	}
	out := &ListResult{Items: make([]*Item, 0, len(rows))}
	for _, row := range rows {
		out.Items = append(out.Items, itemOf(row))
	}
	return out, nil
}

func (s *Service) Delete(ctx context.Context, userID, id int64) error {
	if !s.ready() || userID <= 0 {
		return errs.ErrUnauthorized
	}
	if id <= 0 {
		return errs.ErrInvalidArgument
	}
	fav, err := s.repo.Get(ctx, id)
	if err != nil {
		return err
	}
	if fav.UserID != userID {
		return errs.ErrForbidden
	}
	if err := s.repo.Delete(ctx, userID, id); err != nil {
		return err
	}
	s.deleteFavoriteMedia(ctx, fav.Content)
	return nil
}

func (s *Service) deleteFavoriteMedia(ctx context.Context, raw []byte) {
	payload, err := msgentity.UnmarshalContent(raw)
	if err != nil {
		return
	}
	s.deleteKeys(ctx, payload.ObjectKeys())
}