/**
 * Local helper for seeding the deployed bot's Matrix credentials when the
 * in-container sniff can't reach an authed /chat/ surface and noVNC isn't
 * an option (e.g. Dokploy behind a WebSocket-stripping proxy).
 *
 * Flow:
 *   1. Opens a headed Chromium against a throwaway local profile.
 *   2. You log in to Reddit interactively in that window.
 *   3. The script navigates to chat.reddit.com and watches for the first
 *      authed request to matrix.redditspace.com.
 *   4. The captured bearer is POSTed to the deployed bot's
 *      /api/debug/matrix-credentials endpoint.
 *
 * Usage:
 *   BOT_URL=https://red.apps.jbrunton.co.uk \
 *     tsx scripts/seed-matrix-creds.ts
 *
 * Optional: PROFILE_DIR=./tmp/seed-session to persist your session across
 * runs. Otherwise a temp dir is used.
 */

import fs from 'fs';
import os from 'os';
import path from 'path';
import { chromium, type Request } from 'playwright';
import { createLogger } from '../src/utils/logger.js';
import { fetchWithTimeout } from '../src/utils/fetch-with-timeout.js';

const MATRIX_HOST_RE = /matrix\.(redditspace|reddit)\.com$/i;

async function main() {
  const logger = createLogger();
  const botUrl = process.env.BOT_URL?.replace(/\/$/, '');
  if (!botUrl) {
    logger.error('BOT_URL env var is required (e.g. https://red.apps.jbrunton.co.uk)');
    process.exit(1);
  }

  const profileDir =
    process.env.PROFILE_DIR ??
    fs.mkdtempSync(path.join(os.tmpdir(), 'reddit-seed-'));
  logger.info(`[seed] using profile dir: ${profileDir}`);

  logger.info('[seed] launching browser — log in to Reddit in the window that opens');
  const context = await chromium.launchPersistentContext(profileDir, {
    headless: false,
    viewport: { width: 1280, height: 800 },
  });

  const page = context.pages()[0] ?? (await context.newPage());

  await page.goto('https://www.reddit.com/login', { waitUntil: 'domcontentloaded' });
  logger.info('[seed] waiting for you to finish login (we watch for /api/me.json success)...');

  // Poll /api/me.json from inside the page until it returns a user — that's
  // our signal that login (including any 2FA / captcha steps) is complete.
  const loggedIn = await page.waitForFunction(
    async () => {
      try {
        const r = await fetch('/api/me.json', { credentials: 'include' });
        if (!r.ok) return false;
        const j = await r.json();
        return Boolean(j && j.data && j.data.name);
      } catch {
        return false;
      }
    },
    { timeout: 5 * 60_000, polling: 2_000 },
  ).then(() => true).catch(() => false);

  if (!loggedIn) {
    logger.error('[seed] gave up waiting for login after 5 minutes');
    await context.close();
    process.exit(1);
  }
  logger.info('[seed] login detected — opening chat surface to sniff Matrix bearer');

  let captured: { homeserver: string; accessToken: string } | null = null;
  const onRequest = (request: Request) => {
    if (captured) return;
    try {
      const url = new URL(request.url());
      if (!MATRIX_HOST_RE.test(url.hostname)) return;
      const headers = request.headers();
      const auth = headers['authorization'] || headers['Authorization'];
      if (!auth || !auth.toLowerCase().startsWith('bearer ')) return;
      const token = auth.slice('bearer '.length).trim();
      if (!token) return;
      captured = { homeserver: `${url.protocol}//${url.host}`, accessToken: token };
      logger.info(`[seed] captured bearer for ${captured.homeserver}`);
    } catch {
      // ignore malformed
    }
  };
  page.on('request', onRequest);

  await page.goto('https://www.reddit.com/chat/', { waitUntil: 'domcontentloaded' });
  const deadline = Date.now() + 60_000;
  while (!captured && Date.now() < deadline) {
    await page.waitForTimeout(500);
  }

  if (!captured) {
    logger.error('[seed] did not see any authed matrix.redditspace.com requests after 60s');
    logger.error('[seed] try clicking around the chat UI in the open browser, then re-run');
    await context.close();
    process.exit(1);
  }

  // Resolve user_id via whoami so the bot has it cached too.
  let userId = '';
  try {
    const r = await fetchWithTimeout(
      `${captured.homeserver}/_matrix/client/v3/account/whoami`,
      {
        headers: { Authorization: `Bearer ${captured.accessToken}` },
        timeoutMs: 15_000,
      },
    );
    if (r.ok) {
      const body = (await r.json()) as { user_id?: string };
      if (body.user_id) userId = body.user_id;
    }
  } catch (e) {
    logger.warn(`[seed] whoami failed (continuing without user_id): ${(e as Error).message}`);
  }

  const payload = {
    homeserver: captured.homeserver,
    accessToken: captured.accessToken,
    userId,
    capturedAt: Date.now(),
  };

  logger.info(`[seed] POSTing credentials to ${botUrl}/api/debug/matrix-credentials`);
  const res = await fetchWithTimeout(`${botUrl}/api/debug/matrix-credentials`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(payload),
    timeoutMs: 30_000,
  });
  const text = await res.text();
  if (!res.ok) {
    logger.error(`[seed] upload failed: ${res.status} ${text}`);
    await context.close();
    process.exit(1);
  }
  logger.info(`[seed] upload succeeded: ${text}`);

  await context.close();
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});