/**
 * API Routes Tests (Section 3 of TESTS.md)
 *
 * Integration tests using Supertest against createApp().
 * Runs with OAuth disabled (no SPACE_ID) so all routes are accessible.
 */
import { describe, it, expect, beforeEach, afterEach } from "vitest";
import request from "supertest";
import { mkdtempSync, rmSync, writeFileSync, existsSync } from "fs";
import { mkdirSync } from "fs";
import { tmpdir } from "os";
import { join } from "path";
import * as Y from "yjs";
import { setDataDir, docPath } from "../src/utils.js";
import { createApp } from "../src/create-app.js";
import { resetSaveTimers } from "../src/create-app.js";

let tmpDir: string;
let app: ReturnType<typeof createApp>["app"];
let httpServer: ReturnType<typeof createApp>["httpServer"];
let hocuspocus: ReturnType<typeof createApp>["hocuspocus"];

function seedDoc(name: string, text: string) {
  const ydoc = new Y.Doc();
  const fragment = ydoc.getXmlFragment("default");
  const el = new Y.XmlElement("paragraph");
  el.insert(0, [new Y.XmlText(text)]);
  fragment.insert(0, [el]);

  const frontmatter = ydoc.getMap("frontmatter");
  frontmatter.set("title", "Test Article");
  frontmatter.set("description", "A test article");

  const state = Y.encodeStateAsUpdate(ydoc);
  writeFileSync(docPath(name), Buffer.from(state));
}

beforeEach(() => {
  tmpDir = mkdtempSync(join(tmpdir(), "collab-api-test-"));
  mkdirSync(tmpDir, { recursive: true });
  setDataDir(tmpDir);

  const result = createApp();
  app = result.app;
  httpServer = result.httpServer;
  hocuspocus = result.hocuspocus;
});

afterEach(async () => {
  resetSaveTimers();
  try {
    await hocuspocus.destroy();
  } catch {}
  try {
    httpServer.close();
  } catch {}
  setDataDir(undefined);
  try {
    rmSync(tmpDir, { recursive: true, force: true });
  } catch {}
});

/**
 * Drive the async publish pipeline end-to-end: POST returns a jobId, then we
 * consume /api/publish/stream until the "done" SSE event fires. Supertest
 * buffers the full response body once the server closes the stream, which
 * happens right after `done`.
 */
async function runPublishAndWait(): Promise<{
  success: boolean;
  result?: { htmlUrl: string | null; pdfUrl: string | null; thumbUrl: string | null; success: boolean };
  error?: string;
}> {
  const post = await request(app).post("/api/publish").expect(200);
  expect(post.body).toHaveProperty("jobId");
  const jobId: string = post.body.jobId;

  const stream = await request(app)
    .get(`/api/publish/stream?jobId=${encodeURIComponent(jobId)}`)
    .buffer(true)
    .parse((res, cb) => {
      let data = "";
      res.setEncoding("utf8");
      res.on("data", (chunk: string) => { data += chunk; });
      res.on("end", () => cb(null, data));
    });

  const body = stream.text ?? (stream.body as unknown as string);
  const match = /event: done\ndata: (.+)/.exec(body);
  if (!match) throw new Error(`No done event in SSE body: ${body.slice(0, 500)}`);
  return JSON.parse(match[1]);
}

describe("3.1 Publish routes", () => {
  it("3.1.1 POST /api/publish returns a jobId and the SSE stream reports success", async () => {
    seedDoc("default", "Hello from the test article.");

    const done = await runPublishAndWait();

    expect(done.success).toBe(true);
    expect(done.result?.success).toBe(true);
    expect(typeof done.result?.htmlUrl).toBe("string");
  }, 60_000);

  it("3.1.2 Publish writes local HTML file", async () => {
    seedDoc("default", "Published content goes here.");

    await runPublishAndWait();

    const publishedPath = join(tmpDir, "published", "default", "index.html");
    expect(existsSync(publishedPath)).toBe(true);
  }, 60_000);

  it("3.1.3 Concurrent POST /api/publish returns 409 for the second request", async () => {
    seedDoc("default", "Concurrency check.");

    // Fire both in the same tick. The mutex is set synchronously inside the
    // first handler before `res.json({ jobId })` is returned, so the second
    // handler (scheduled right after) must see it and respond with 409.
    const [a, b] = await Promise.all([
      request(app).post("/api/publish"),
      request(app).post("/api/publish"),
    ]);

    const statuses = [a.status, b.status].sort((x, y) => x - y);
    expect(statuses).toEqual([200, 409]);

    const winner = a.status === 200 ? a : b;
    expect(winner.body).toHaveProperty("jobId");
    const loser = a.status === 409 ? a : b;
    expect(loser.body).toHaveProperty("error");

    // Drain the SSE stream so the job releases cleanly and the test harness
    // doesn't leak open sockets.
    await request(app)
      .get(`/api/publish/stream?jobId=${encodeURIComponent(winner.body.jobId)}`)
      .buffer(true)
      .parse((res, cb) => {
        let data = "";
        res.setEncoding("utf8");
        res.on("data", (chunk: string) => { data += chunk; });
        res.on("end", () => cb(null, data));
      });
  }, 60_000);
});

describe("3.2 Auth status", () => {
  it("returns authenticated=true when OAuth is disabled", async () => {
    const res = await request(app)
      .get("/api/auth/status")
      .expect(200);

    expect(res.body).toHaveProperty("authenticated", true);
    expect(res.body).toHaveProperty("canEdit", true);
  });
});