/**
 * Patch: extract DM content from object.source.content when object.content is empty.
 *
 * Bluesky DMs bridged via bsky.brid.gy arrive as Create activities wrapping a
 * ChatMessage object. Bridgy Fed sends the message text in `source.content`
 * (plain text, mediaType: text/plain) without a `content` field (HTML).
 *
 * The DM handler only checked `object.content`, so all bsky.brid.gy DMs were
 * stored with empty content, making them unviewable in Mona.
 *
 * Fix: after extracting `rawHtml` from `object.content`, also read
 * `object.source?.content` as a plain-text fallback for `contentText` when
 * `rawHtml` is empty.
 */

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

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

const MARKER = "// [patch] bsky-source-content-fallback";

const OLD = `    const rawHtml = object.content?.toString() || "";
    const contentHtml = sanitizeContent(rawHtml);
    const contentText = rawHtml.replace(/<[^>]*>/g, "").substring(0, 500);`;

const NEW = `    const rawHtml = object.content?.toString() || "";
    const sourceText = object.source?.content?.toString() || ""; // [patch] bsky-source-content-fallback
    const contentHtml = sanitizeContent(rawHtml);
    const contentText = rawHtml
      ? rawHtml.replace(/<[^>]*>/g, "").substring(0, 500)
      : sourceText.substring(0, 500);`;

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;
  const src = await readFile(filePath, "utf8");
  if (src.includes(MARKER)) {
    console.log(`[postinstall] patch-ap-dm-bsky-source-content: already applied in ${filePath}`);
    patched = true;
    break;
  }
  if (!src.includes(OLD)) {
    console.log(`[postinstall] patch-ap-dm-bsky-source-content: target snippet not found in ${filePath}`);
    continue;
  }
  await writeFile(filePath, src.replace(OLD, NEW), "utf8");
  console.log(`[postinstall] patch-ap-dm-bsky-source-content: applied to ${filePath}`);
  patched = true;
  break;
}

if (!patched) {
  console.log("[postinstall] patch-ap-dm-bsky-source-content: no target file found");
}