package storage

import (
	"errors"
	"strings"

	"github.com/redis/go-redis/v9"
)

const (
	cacheUserHandleToIdPrefix = "acc-name-to-id:"
	cacheUserIdToAccPrefix    = "acc-id-to-data:"
)

var errCacheNotFound = errors.New("not found in cache")

// Find an account id in cache using a given user handle
func (s *Storage) cacheHandleToAccUid(handle string) (*string, error) {
	// Where to put the data (in case it's found)
	var target string
	found, err := s.cache.Get(cacheUserHandleToIdPrefix+strings.TrimLeft(handle, "@"), &target)
	// If nothing was found, check error
	if !found {
		// Case error is set and NOT redis' error for nothing found: Return that error
		if err != nil && !errors.Is(err, redis.Nil) {
			return nil, err
		} else {
			// Else return errCacheNotFound
			return nil, errCacheNotFound
		}
	}
	return &target, nil
}

// Find an account's data in cache using a given account id
func (s *Storage) cacheAccIdToData(id string) (*Account, error) {
	var target Account
	found, err := s.cache.Get(cacheUserIdToAccPrefix+id, &target)
	if !found {
		if err != nil && !errors.Is(err, redis.Nil) {
			return nil, err
		} else {
			return nil, errCacheNotFound
		}
	}
	return &target, nil
}