package web_api

import (
	"context"
	"strconv"

	"git.itzana.me/strafesnet/maps-service/pkg/api"
)

// BatchUsernames handles batch fetching of usernames
func (svc *Service) BatchUsernames(ctx context.Context, req *api.BatchUsernamesReq) (*api.BatchUsernamesOK, error) {
	if len(req.UserIds) == 0 {
		return &api.BatchUsernamesOK{
			Usernames: api.NewOptBatchUsernamesOKUsernames(map[string]string{}),
		}, nil
	}

	// Fetch usernames from service
	usernames, err := svc.inner.GetUsernames(ctx, req.UserIds)
	if err != nil {
		return nil, err
	}

	// Convert map[uint64]string to map[string]string for JSON
	result := make(map[string]string, len(usernames))
	for userID, username := range usernames {
		result[strconv.FormatUint(userID, 10)] = username
	}

	return &api.BatchUsernamesOK{
		Usernames: api.NewOptBatchUsernamesOKUsernames(result),
	}, nil
}