import { test, before, after } from "node:test";
import assert from "node:assert/strict";
import { createServer } from "node:http";
import { startApi, fixture } from "./support/nextcloud.js";

// The server's own checks of the catalog: listings only of folders whose ETag changed, the index
// rebuilt only for a changed document, and messages to the owner in Telegram (a stand-in here).
let api, telegram, watch;
const messages = [];
// What the dashboard shows (/status, behind its password).
const health = async () => (await fetch(api.base + "/status/data.json", { headers: { Authorization: "Basic " + Buffer.from("admin:secret").toString("base64") } })).json();
const lastMessage = () => messages.at(-1)?.text || "";

before(async () => {
  telegram = createServer((req, res) => {
    let body = "";
    req.on("data", (c) => (body += c));
    req.on("end", () => {
      messages.push({ path: req.url, ...JSON.parse(body) });
      res.setHeader("Content-Type", "application/json");
      res.end(JSON.stringify({ ok: true }));
    });
  });
  await new Promise((resolve) => telegram.listen(0, "127.0.0.1", resolve));
  api = await startApi({
    TELEGRAM_BOT_TOKEN: "test-token",
    TELEGRAM_CHAT_ID: "42",
    TELEGRAM_API: `http://127.0.0.1:${telegram.address().port}`,
    PSU_PUBLIC_URL: "https://psu.example",
    PSU_ALERT_SOURCE_DOWN_MS: "0",
    // Every check reaches the stand-in, however soon after the last one.
    PSU_MIN_REFRESH_MS: "0",
    DASHBOARD_PASSWORD: "secret",
  });
  watch = await import("../server/watch.js");
});
after(() => {
  api?.stop();
  telegram?.close();
});

test("Наблюдение: первая проверка обходит весь каталог и включает оповещения", async () => {
  await watch.watchOnce();
  const { catalog, directory, telegram: tg, watch: status } = await health();
  assert.equal(catalog.lastCrawl.full, true);
  assert.equal(directory.documents, 2);
  assert.equal(tg.enabled, true);
  assert.equal(status.lastError, null);
  assert.equal(messages.length, 1);
  assert.equal(messages[0].path, "/bottest-token/sendMessage");
  assert.equal(messages[0].chat_id, "42");
  assert.match(lastMessage(), /Оповещения расписания ПГУ включены/);
  assert.match(lastMessage(), /2 документов, не читаются: 2/);
});

test("Наблюдение: неизменный каталог — два листинга, индекс и ETag расписаний те же", async () => {
  const before = await health();
  const listings = api.stats.listings;
  await watch.watchOnce();
  const after = await health();
  assert.equal(api.stats.listings - listings, 2);
  assert.equal(after.catalog.lastCrawl.requests, 2);
  assert.equal(after.catalog.lastCrawl.full, false);
  assert.ok(after.catalog.lastCrawl.reused >= 1);
  assert.equal(after.directory.builtAt, before.directory.builtAt);
  assert.equal(messages.length, 1);
});

test("Наблюдение: новый документ — листинг только изменившихся папок и сообщение", async () => {
  const listings = api.stats.listings;
  api.catalog.put("26-АРХ.docx", fixture("isf-credits-26-arh.docx"));
  await watch.watchOnce();
  const { catalog, directory } = await health();
  // The share's root, the year folder, the faculty folder and the day-time folder.
  assert.equal(api.stats.listings - listings, 4);
  assert.equal(catalog.lastCrawl.requests, 4);
  assert.equal(directory.documents, 3);
  assert.equal(messages.length, 2);
  assert.match(lastMessage(), /Новый документ: 26-АРХ\.docx/);
  assert.match(lastMessage(), /Группы: 26-АРХ/);
  const groups = await (await fetch(api.base + "/api/groups?" + new URLSearchParams({ q: "26-АРХ" }))).json();
  assert.ok(groups.results.some((g) => g.group === "26-АРХ"));
});

test("Наблюдение: перезалитый документ с новыми подозрительными ячейками", async () => {
  // 23-БА's "2,6-12-16н" lands in a document that had no such cell.
  api.catalog.put("24-ИТ.docx", fixture("fef-23-ba.docx"));
  await watch.watchOnce();
  assert.equal(messages.length, 3);
  assert.match(lastMessage(), /Перезалит с новыми подозрительными ячейками: 24-ИТ\.docx/);
  assert.match(lastMessage(), /2,6-12-16н/);
  assert.match(lastMessage(), /https:\/\/psu\.example\/api\/diagnostics\?doc=/);
  // Republished again as it is: nothing new to say.
  api.catalog.put("24-ИТ.docx", fixture("fef-23-ba.docx"));
  await watch.watchOnce();
  assert.equal(messages.length, 3);
});

test("Наблюдение: университет не отвечает и снова отвечает", async () => {
  api.catalog.down(true);
  await watch.watchOnce();
  const { watch: status, catalog } = await health();
  assert.ok(status.lastError);
  assert.ok(catalog.failingSince);
  assert.equal(messages.length, 4);
  assert.match(lastMessage(), /Каталог университета не отвечает/);
  // Still down: one message per outage.
  await watch.watchOnce();
  assert.equal(messages.length, 4);
  api.catalog.down(false);
  await watch.watchOnce();
  assert.equal(messages.length, 5);
  assert.match(lastMessage(), /снова отвечает/);
  const { watch: after, events } = await health();
  assert.equal(after.lastError, null);
  // The dashboard's feed, newest first: everything above, republished-as-is included.
  assert.deepEqual(
    events.map((e) => e.kind),
    ["source_up", "source_down", "republished", "republished", "new"],
  );
  assert.equal(events[2].text, "без новых подозрительных ячеек");
  assert.match(events[3].text, /новых подозрительных ячеек: 1/);
});