package inmemory

import (
	"context"
	"fmt"

	"git.loyso.art/frx/eway/internal/entity"
	"git.loyso.art/frx/eway/internal/storage"
)

type mapper struct {
	categoryIDByName map[string]int64
	base             storage.Repository
}

func NewMapper(ctx context.Context, r storage.Repository) (*mapper, error) {
	categories, err := r.Category().List(ctx)
	if err != nil {
		return nil, fmt.Errorf("listing categories: %w", err)
	}

	catsByName := make(map[string]int64, len(categories))
	for _, category := range categories {
		catsByName[category.Name] = category.ID
	}

	return &mapper{
		categoryIDByName: catsByName,
		base:             r,
	}, nil
}

func (m *mapper) CategoryNameToID(ctx context.Context, name string) (int64, error) {
	out, ok := m.categoryIDByName[name]
	if !ok {
		return 0, entity.ErrNotFound
	}

	return out, nil
}