/**
 * Patch: add a 2-minute deploy delay before ActivityPub syndication.
 *
 * When a post is created (via Micropub or Mastodon-API compose), the
 * blog's deploy pipeline (Gitea → Eleventy → rsync) takes ~1-2 minutes.
 * If ActivityPub fires immediately, followers receive a Create activity
 * whose `url` still 404s — Mastodon clients show a broken link.
 *
 * This patch inserts a `setTimeout`-based delay at the top of the
 * `syndicate()` function. The delay is configurable via the
 * AP_SYNDICATE_DELAY_MS environment variable (default: 120000 = 2 min).
 */

import { access, readFile, writeFile } from "node:fs/promises";

const candidates = [
  "node_modules/@rmdes/indiekit-endpoint-activitypub/lib/syndicator.js",
  "node_modules/@indiekit/indiekit/node_modules/@rmdes/indiekit-endpoint-activitypub/lib/syndicator.js",
];

const MARKER = "// [patch] ap-syndicate-deploy-delay";

// The line right after the early-exit guards — insert before the
// try { const actorUrl = ... } block.
const INSERT_AFTER = `      try {
        const actorUrl = plugin._getActorUrl();`;

const DELAY_BLOCK = `      // [patch] ap-syndicate-deploy-delay — wait for deploy pipeline before federating
      const _apDelay = Number.parseInt(process.env.AP_SYNDICATE_DELAY_MS ?? "120000", 10);
      if (_apDelay > 0) {
        console.info(\`[ActivityPub] Delaying syndication by \${_apDelay}ms for \${properties.url}\`);
        await new Promise((resolve) => setTimeout(resolve, _apDelay));
      }
      ${MARKER}
      try {
        const actorUrl = plugin._getActorUrl();`;

async function exists(p) {
  try { await access(p); return true; } catch { return false; }
}

let patched = false;
for (const filePath of candidates) {
  if (!(await exists(filePath))) continue;
  let src = await readFile(filePath, "utf8");
  if (src.includes(MARKER)) {
    console.log(`[postinstall] patch-ap-syndicate-deploy-delay: already applied in ${filePath}`);
    patched = true;
    break;
  }
  if (!src.includes(INSERT_AFTER)) {
    console.log(`[postinstall] patch-ap-syndicate-deploy-delay: insertion point not found in ${filePath}`);
    continue;
  }
  src = src.replace(INSERT_AFTER, DELAY_BLOCK);
  await writeFile(filePath, src, "utf8");
  console.log(`[postinstall] patch-ap-syndicate-deploy-delay: applied in ${filePath}`);
  patched = true;
  break;
}

if (!patched) {
  console.log("[postinstall] patch-ap-syndicate-deploy-delay: no target file found");
}