/**
 * Smoke test — end-to-end validation of the remote-control HTTP/WS server.
 *
 * Runs with: node --test scripts/smoke/smoke.mjs
 * Or:        npm run smoke
 *
 * What is tested (MVP):
 *   1. Server starts  — pi spawns with --remote-control and the HTTP port opens.
 *   2. GET /manifest.json — 200, application/manifest+json, parses, has name/short_name/start_url.
 *   3. GET /icon.svg       — 200, image/svg+xml, body starts with <svg.
 *   4. GET /               — 200 (with auth token), text/html, contains HTML marker.
 *   5. WS /ws              — successful 101 upgrade (with auth token). Close cleanly.
 *   6. Teardown            — SIGTERM pi, process exits.
 *
 * Auth strategy:
 *   The server requires a token on GET / and WS /ws. We pre-seed a known token
 *   in a temporary HOME directory ($HOME/.pi/remote-control/token) and pass it
 *   via the ?token= query parameter using the existing mechanism. No production
 *   code is modified.
 *
 * Port strategy:
 *   We write bindAddress + publicBaseUrl to the temporary config so the server
 *   binds to a deterministic port (SMOKE_PORT env, default 19876). No real
 *   ~/.pi files are touched.
 */

import assert from "node:assert/strict";
import path from "node:path";
import { after, before, describe, it } from "node:test";
import { fileURLToPath } from "node:url";
import {
  baseUrl,
  closeWebSocket,
  createSmokeHome,
  fetchText,
  killPi,
  openWebSocket,
  removeSmokeHome,
  spawnPi,
  waitForPort,
} from "./helpers.mjs";

// ── Configuration ─────────────────────────────────────────────────────────────

const SMOKE_PORT = Number(process.env.SMOKE_PORT ?? 19876);
const SMOKE_TOKEN = "smoke-test-token-deterministic-1234";

const EXTENSION_PATH = path.resolve(
  path.dirname(fileURLToPath(import.meta.url)),
  "../../extensions/remote-control",
);

// ── Suite ─────────────────────────────────────────────────────────────────────

describe("remote-control smoke tests", () => {
  /** @type {import("node:child_process").ChildProcess} */
  let proc;
  /** @type {string} */
  let fakeHome;
  /** @type {string[]} */
  let logs;

  before(async () => {
    // Create temp HOME with config + token
    fakeHome = await createSmokeHome({ port: SMOKE_PORT, token: SMOKE_TOKEN });

    // Spawn pi
    ({ proc, logs } = spawnPi({ extensionPath: EXTENSION_PATH, fakeHome }));

    // Wait for the HTTP server to open the TCP port
    try {
      await waitForPort({ port: SMOKE_PORT });
    } catch (err) {
      // Attach captured logs to the error for easy debugging
      const captured = logs.join("");
      throw new Error(
        `${err.message}\n\n--- pi stdout/stderr ---\n${captured || "(empty)"}`,
      );
    }
  });

  after(async () => {
    // Always clean up — kill pi and remove temp HOME
    if (proc) {
      await killPi(proc);
    }
    if (fakeHome) {
      await removeSmokeHome(fakeHome);
    }
  });

  // ── Test 1: manifest.json ───────────────────────────────────────────────────

  it("GET /manifest.json → 200 application/manifest+json with required fields", async () => {
    const { res, body } = await fetchText(
      `${baseUrl(SMOKE_PORT)}/manifest.json`,
    );

    assert.equal(res.status, 200, `Expected 200, got ${res.status}`);

    const ct = res.headers.get("content-type") ?? "";
    assert.ok(
      ct.includes("application/manifest+json"),
      `Expected content-type application/manifest+json, got: ${ct}`,
    );

    let manifest;
    try {
      manifest = JSON.parse(body);
    } catch {
      assert.fail(
        `manifest.json body is not valid JSON: ${body.slice(0, 200)}`,
      );
    }

    assert.ok(
      typeof manifest.name === "string" && manifest.name.length > 0,
      "manifest.name must be a non-empty string",
    );
    assert.ok(
      typeof manifest.short_name === "string" && manifest.short_name.length > 0,
      "manifest.short_name must be a non-empty string",
    );
    assert.ok(
      typeof manifest.start_url === "string" && manifest.start_url.length > 0,
      "manifest.start_url must be a non-empty string",
    );
  });

  // ── Test 2: icon.svg ────────────────────────────────────────────────────────

  it("GET /icon.svg → 200 image/svg+xml, body starts with <svg", async () => {
    const { res, body } = await fetchText(`${baseUrl(SMOKE_PORT)}/icon.svg`);

    assert.equal(res.status, 200, `Expected 200, got ${res.status}`);

    const ct = res.headers.get("content-type") ?? "";
    assert.ok(
      ct.includes("image/svg+xml"),
      `Expected content-type image/svg+xml, got: ${ct}`,
    );

    assert.ok(
      body.trimStart().startsWith("<svg"),
      `Expected body to start with <svg, got: ${body.slice(0, 100)}`,
    );
  });

  // ── Test 3: root with auth ──────────────────────────────────────────────────

  it("GET / (with token) → 200 text/html containing HTML marker", async () => {
    const url = `${baseUrl(SMOKE_PORT)}/?token=${SMOKE_TOKEN}`;
    // The server issues a 302 redirect on first token auth (sets session cookie),
    // then serves 200 on the redirect target. Follow redirects manually to keep
    // cookies across the redirect chain.
    const cookieJar = {};

    // First request: expect 302
    const first = await fetch(url, { redirect: "manual" });

    let body;
    if (first.status === 302) {
      // Extract session cookie
      for (const [name, value] of first.headers.entries()) {
        if (name.toLowerCase() === "set-cookie") {
          const match = value.match(/^([^=]+)=([^;]+)/);
          if (match) cookieJar[match[1]] = match[2];
        }
      }
      const location = first.headers.get("location") ?? "/";
      const cookieHeader = Object.entries(cookieJar)
        .map(([k, v]) => `${k}=${v}`)
        .join("; ");

      const second = await fetch(`${baseUrl(SMOKE_PORT)}${location}`, {
        headers: cookieHeader ? { Cookie: cookieHeader } : {},
      });
      assert.equal(
        second.status,
        200,
        `Expected 200 on redirect target, got ${second.status}`,
      );
      const ct = second.headers.get("content-type") ?? "";
      assert.ok(
        ct.includes("text/html"),
        `Expected content-type text/html, got: ${ct}`,
      );
      body = await second.text();
    } else {
      assert.equal(first.status, 200, `Expected 200, got ${first.status}`);
      const ct = first.headers.get("content-type") ?? "";
      assert.ok(
        ct.includes("text/html"),
        `Expected content-type text/html, got: ${ct}`,
      );
      body = await first.text();
    }

    // Check for a marker from html.ts — the title is always present
    assert.ok(
      body.includes("<!DOCTYPE html>"),
      "Expected body to contain <!DOCTYPE html>",
    );
    assert.ok(
      body.includes("remote-control") ||
        body.includes("Pi Remote") ||
        body.includes("π"),
      "Expected body to contain a known HTML marker (remote-control / Pi Remote / π)",
    );
  });

  // ── Test 4: 403 on unauthenticated root ─────────────────────────────────────

  it("GET / (no token) → 403 Forbidden", async () => {
    const { res } = await fetchText(`${baseUrl(SMOKE_PORT)}/`);
    assert.equal(
      res.status,
      403,
      `Expected 403 without token, got ${res.status}`,
    );
  });

  // ── Test 5: WebSocket upgrade ───────────────────────────────────────────────

  it("WS /ws (with token) → successful 101 upgrade", async () => {
    const wsUrl = `ws://127.0.0.1:${SMOKE_PORT}/ws?token=${SMOKE_TOKEN}`;

    // First, get a session cookie via HTTP (WS token auth also works directly
    // since isAuthenticated checks URL searchParams on the Upgrade request)
    const ws = await openWebSocket(wsUrl);

    assert.ok(
      ws.readyState === ws.constructor.OPEN,
      "WebSocket should be in OPEN state after successful handshake",
    );

    await closeWebSocket(ws);
  });

  // ── Test 6: teardown (handled in after(), verified here) ───────────────────

  it("pi process is alive during tests", () => {
    assert.equal(
      proc.exitCode,
      null,
      "pi process should still be running during tests",
    );
  });
});