package admin

import (
	"context"
	"errors"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"

	"github.com/yuxingu/digital-psychology/apps/api/internal/repository"
)

var ErrBannerNotFound = errString("banner not found")
var ErrFeedSlotNotFound = errString("feed slot not found")

// ListBanners returns OpsCMS Banner catalog.
func (s *Service) ListBanners(ctx context.Context) ([]repository.BannerRow, error) {
	items, err := s.Repo.ListBanners(ctx)
	if err != nil {
		return nil, err
	}
	if items == nil {
		items = []repository.BannerRow{}
	}
	return items, nil
}

// GetBanner loads one banner.
func (s *Service) GetBanner(ctx context.Context, id uuid.UUID) (*repository.BannerRow, error) {
	row, err := s.Repo.GetBanner(ctx, id)
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, ErrBannerNotFound
	}
	return row, err
}

// ListFeedSlots returns OpsCMS FeedSlot catalog.
func (s *Service) ListFeedSlots(ctx context.Context) ([]repository.FeedSlotRow, error) {
	items, err := s.Repo.ListFeedSlots(ctx)
	if err != nil {
		return nil, err
	}
	if items == nil {
		items = []repository.FeedSlotRow{}
	}
	return items, nil
}

// GetFeedSlot loads one feed slot.
func (s *Service) GetFeedSlot(ctx context.Context, id uuid.UUID) (*repository.FeedSlotRow, error) {
	row, err := s.Repo.GetFeedSlot(ctx, id)
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, ErrFeedSlotNotFound
	}
	return row, err
}