package admin

import (
	"context"
	"errors"

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

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

var ErrSystemPromptNotFound = errString("system prompt not found")
var ErrKnowledgeSourceNotFound = errString("knowledge source not found")

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

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

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

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