package admin

import (
	"context"
	"errors"

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

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

var ErrKnowledgeChunkNotFound = errString("knowledge chunk not found")

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

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