#!/usr/bin/env node
// One-shot migration: sanitize existing card.fullContent in data/cards.txt.
// Backups the original to data/cards.txt.bak-<timestamp> before rewriting.
// Run: `node scripts/sanitize-existing-cards.mjs`.

import { readFile, writeFile, copyFile } from 'node:fs/promises';
import { resolve, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import sanitizeHtml from 'sanitize-html';

const __dirname = dirname(fileURLToPath(import.meta.url));
const CARDS_PATH = resolve(__dirname, '..', 'data', 'cards.txt');

// Keep this config in sync with lib/sanitize.ts
const CARD_HTML_CONFIG = {
  allowedTags: [
    'p', 'br', 'strong', 'em', 'b', 'i', 'u',
    'ul', 'ol', 'li',
    'a',
    'h1', 'h2', 'h3', 'h4', 'h5', 'h6',
    'blockquote',
    'span',
  ],
  allowedAttributes: {
    a: ['href', 'title', 'target', 'rel'],
    span: ['class'],
    '*': [],
  },
  allowedSchemes: ['http', 'https', 'mailto', 'tel'],
  allowedSchemesAppliedToAttributes: ['href'],
  transformTags: {
    a: sanitizeHtml.simpleTransform('a', { rel: 'noopener noreferrer', target: '_blank' }),
  },
  disallowedTagsMode: 'discard',
};

async function main() {
  let raw;
  try {
    raw = await readFile(CARDS_PATH, 'utf-8');
  } catch (err) {
    if (err.code === 'ENOENT') {
      console.log(`No cards file at ${CARDS_PATH}, nothing to do.`);
      return;
    }
    throw err;
  }

  let cards;
  try {
    cards = JSON.parse(raw);
  } catch (err) {
    console.error('Cards file is not valid JSON; refusing to migrate.', err.message);
    process.exit(1);
  }

  if (!Array.isArray(cards)) {
    console.error('Cards file is not an array; refusing to migrate.');
    process.exit(1);
  }

  const ts = new Date().toISOString().replace(/[:.]/g, '-');
  const backupPath = `${CARDS_PATH}.bak-${ts}`;
  await copyFile(CARDS_PATH, backupPath);
  console.log(`Backup written: ${backupPath}`);

  let changed = 0;
  for (const card of cards) {
    if (typeof card?.fullContent === 'string' && card.fullContent.length > 0) {
      const cleaned = sanitizeHtml(card.fullContent, CARD_HTML_CONFIG);
      if (cleaned !== card.fullContent) {
        card.fullContent = cleaned;
        changed++;
      }
    }
  }

  await writeFile(CARDS_PATH, JSON.stringify(cards, null, 2), 'utf-8');
  console.log(`Migration done. Cards changed: ${changed} / ${cards.length}.`);
}

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