import test from 'node:test';
import assert from 'node:assert/strict';
import { fetchWithTimeout, fetchJsonWithTimeout, fetchTextWithTimeout } from '../src/util/fetch.mjs';
import { createOverpassClient } from '../src/sources/overpass.mjs';

function waitingFetch(url, { signal }) {
  return new Promise((resolve, reject) => {
    signal.addEventListener('abort', () => reject(signal.reason), { once: true });
  });
}

test('fetchWithTimeout aborta requisicao que excede o prazo', async () => {
  await assert.rejects(
    fetchWithTimeout('https://example.test', { fetch: waitingFetch }, 5),
    /timeout.*5ms/i
  );
});

test('fetchWithTimeout combina cancelamento externo sem esperar o timeout', async () => {
  const controller = new AbortController();
  const promise = fetchWithTimeout('https://example.test', { fetch: waitingFetch, signal: controller.signal }, 10_000);
  controller.abort(new Error('cancelado pelo usuario'));
  await assert.rejects(promise, /cancelado pelo usuario/i);
});

test('fetchJsonWithTimeout mantem timer ate body JSON terminar', async () => {
  let aborted = false;
  const fetch = async (url, { signal }) => {
    signal.addEventListener('abort', () => { aborted = true; }, { once: true });
    return new Response(new ReadableStream({ start(controller) { controller.enqueue(Buffer.from('{"ok":')); } }));
  };
  await assert.rejects(fetchJsonWithTimeout('https://example.test', { fetch }, 10), /timeout.*10ms/i);
  assert.equal(aborted, true);
});

test('fetchTextWithTimeout limita bytes do corpo', async () => {
  await assert.rejects(
    fetchTextWithTimeout('https://example.test', { fetch: async () => new Response('123456') }, 1000, { maxBytes: 5 }),
    /limite.*5 bytes/i
  );
});

test('Overpass mantem timeout proprio durante leitura do corpo', async () => {
  const originalFetch = globalThis.fetch;
  globalThis.fetch = async () => new Response(new ReadableStream({
    start(controller) { controller.enqueue(Buffer.from('{"elements":')); }
  }));
  try {
    const request = createOverpassClient({ urls: ['https://overpass.test'], timeoutMs: 10 });
    await assert.rejects(request('[out:json];'), /timeout/i);
  } finally {
    globalThis.fetch = originalFetch;
  }
});