#!/usr/bin/env node

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

function label(value) {
  return value
    .replace(/\.pdf$/i, '')
    .replaceAll('_', ' ')
    .replace(/\b\w/g, (character) => character.toUpperCase());
}

export function renderPdfArchive(tsv) {
  const rows = tsv.trim().split(/\r?\n/).slice(1).map((line) => {
    const [mediaId, publicUrl] = line.split('\t');
    const parts = mediaId.split(':');
    return { publicUrl, directories: parts.slice(1, -1), filename: parts.at(-1) };
  });
  const lines = [
    '---',
    'title: Previous exams and documents',
    'description: Permission-cleared exams, summaries, notes, and other course documents recovered from the previous Incognito wiki.',
    '---',
    '',
    'This archive contains 332 documents recovered from the previous Incognito wiki. The original folders and filenames are preserved so their course context remains visible.',
    '',
    ':::caution[Historical documents]',
    'These files originated in the previous wiki and may refer to older course structures, learning objectives, or examination formats. Check current course information before relying on them.',
    ':::',
    '',
  ];
  let previous = [];
  for (const row of rows) {
    const shared = row.directories.findIndex((part, index) => previous[index] !== part);
    const start = shared === -1 ? Math.min(previous.length, row.directories.length) : shared;
    for (let index = start; index < row.directories.length; index += 1) {
      lines.push(`${'#'.repeat(Math.min(index + 2, 6))} ${label(row.directories[index])}`, '');
    }
    lines.push(`- [${label(row.filename)}](${row.publicUrl})`, '');
    previous = row.directories;
  }
  return `${lines.join('\n').trim()}\n`;
}

if (process.argv[1]?.endsWith('generate-pdf-archive.mjs')) {
  const output = renderPdfArchive(await readFile('docs/pdf-inventory.tsv', 'utf8'));
  await writeFile('src/content/docs/previous-exams-and-documents.md', output);
}