type DadataAddressSuggestion = {
  value: string;
  unrestricted_value?: string;
  data?: {
    fias_id?: string;
  };
};

export default defineEventHandler(async (event) => {
  const config = useRuntimeConfig(event);
  const token = String(config.dadataApiToken || '').trim();
  if (!token) {
    throw createError({
      statusCode: 500,
      statusMessage: 'DADATA_API_TOKEN is not configured.',
    });
  }

  const body = await readBody<{ query?: string }>(event);
  const query = String(body?.query ?? '').trim();
  if (query.length < 2) {
    return { suggestions: [] as DadataAddressSuggestion[] };
  }

  const response = await $fetch<{ suggestions?: DadataAddressSuggestion[] }>(
    'https://suggestions.dadata.ru/suggestions/api/4_1/rs/suggest/address',
    {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Accept: 'application/json',
        Authorization: `Token ${token}`,
      },
      body: {
        query,
        count: 10,
      },
    },
  );

  return {
    suggestions: response.suggestions ?? [],
  };
});