import { catalog } from './catalog.js';
import { files } from './files.js';

const state = { selected: catalog[0], query: '', preview: 'original', file: null, sourceByPath: new Map(), lens: false, rendered: false, diff: false, searching: false, contentMatches: new Set(), searchTimer: null, searchRequest: 0 };
const $ = (selector) => document.querySelector(selector);
const escape = (value) => value.replace(/[&<>"']/g, (character) => ({ '&':'&amp;', '<':'&lt;', '>':'&gt;', '"':'&quot;', "'":'&#039;' })[character]);
const redact = (value, entry) => {
  const safe = value.replace(/(NDO_PASS[^\n=]*[=:]\s*["']?)[^\n"']+/gi, '$1[REDACTED]').replace(/(password["']?\s*[:=]\s*["']?)[^\n"']+/gi, '$1[REDACTED]').replace(/\b[\w.+-]+@[\w.-]+\.[a-z]{2,}\b/gi, '[REDACTED SERVICE ACCOUNT]').replace(/\/home\/[A-Za-z0-9._-]+(?=\/)/g, '[REDACTED LOCAL USER]').replace(/display\/~[A-Za-z0-9._-]+/gi, 'display/~[REDACTED USER]');
  return entry.id === 'ndo-repro' ? safe.replace(/https?:\/\/[^\s)>]+/gi, '[REDACTED URL]').replace(/\b(?:[\w-]+\.)*netcracker\.[\w.-]+\b/gi, '[REDACTED HOST]').replace(/\bpedro[._ -]?aranha\b/gi, '[REDACTED CONTRIBUTOR]') : safe;
};
const download = (name, content) => { const url = URL.createObjectURL(new Blob([content], { type: 'text/markdown' })); const a = document.createElement('a'); a.href = url; a.download = name; a.click(); URL.revokeObjectURL(url); };
const copy = async (content) => {
  if (navigator.clipboard?.writeText) return navigator.clipboard.writeText(content);
  const textarea = document.createElement('textarea'); textarea.value = content; textarea.setAttribute('readonly', ''); textarea.style.position = 'fixed'; textarea.style.opacity = '0'; document.body.append(textarea); textarea.select(); document.execCommand('copy'); textarea.remove();
};
const packageFiles = (entry = state.selected) => files[entry.id] || [{ name: 'SKILL.md', path: entry.path, kind: 'skill' }];
const packageSearchText = (entry) => packageFiles(entry).map((file) => `${file.name} ${file.kind}`).join(' ');
const unchangedDraft = (file) => `# ${file.name}\n\n> Kept as-is in the improved package\n\nThis ${file.kind} file was not rewritten. Select **Change lens** to see why the improved draft concentrates its changes in the main skill contract.`;
const currentSource = () => state.sourceByPath.get(state.file.path);
const currentContent = () => state.preview === 'original' ? (currentSource() || 'Loading original file…') : (state.file.improved || (state.file.name === 'SKILL.md' ? state.selected.improved : (currentSource() ? `# ${state.file.name}\n\n> Kept as-is in the improved package\n\n${currentSource()}` : unchangedDraft(state.file))));
const inlineMarkdown = (value) => escape(value)
  .replace(/`([^`]+)`/g, '<code>$1</code>')
  .replace(/\*\*([^*]+)\*\*/g, '<strong>$1</strong>')
  .replace(/(?<!\*)\*([^*]+)\*(?!\*)/g, '<em>$1</em>')
  .replace(/\[([^\]]+)\]\((https?:\/\/[^\s)]+)\)/g, '<a href="$2" target="_blank" rel="noreferrer">$1 ↗</a>');
const tableCells = (line) => line.trim().replace(/^\||\|$/g, '').split('|').map((cell) => cell.trim());
const isTableDivider = (line) => /^\s*\|?\s*:?-{3,}:?\s*(\|\s*:?-{3,}:?\s*)+\|?\s*$/.test(line);
function markdownMarkup(markdown) {
  const lines = markdown.replace(/\r/g, '').split('\n'); let index = 0; const out = [];
  if (lines[0] === '---') {
    const end = lines.indexOf('---', 1);
    if (end > 0) { out.push(`<dl class="markdown-frontmatter">${lines.slice(1, end).map((line) => { const [key, ...rest] = line.split(':'); return rest.length ? `<dt>${escape(key)}</dt><dd>${inlineMarkdown(rest.join(':').trim())}</dd>` : ''; }).join('')}</dl>`); index = end + 1; }
  }
  const startsBlock = (line, next) => !line || /^#{1,6}\s+/.test(line) || /^```/.test(line) || /^[-*+]\s+/.test(line) || /^\d+\.\s+/.test(line) || /^>\s?/.test(line) || /^---+$/.test(line) || (line.includes('|') && isTableDivider(next || ''));
  while (index < lines.length) {
    const line = lines[index];
    if (!line.trim()) { index += 1; continue; }
    const heading = line.match(/^(#{1,6})\s+(.+)$/);
    if (heading) { const level = heading[1].length; out.push(`<h${level}>${inlineMarkdown(heading[2])}</h${level}>`); index += 1; continue; }
    if (/^```/.test(line)) { const language = line.slice(3).trim(); const code = []; index += 1; while (index < lines.length && !/^```/.test(lines[index])) code.push(lines[index++]); if (index < lines.length) index += 1; out.push(`<pre><code${language ? ` data-language="${escape(language)}"` : ''}>${escape(code.join('\n'))}</code></pre>`); continue; }
    if (line.includes('|') && isTableDivider(lines[index + 1] || '')) { const headings = tableCells(line); index += 2; const rows = []; while (index < lines.length && lines[index].includes('|') && lines[index].trim()) rows.push(tableCells(lines[index++])); out.push(`<div class="markdown-table-wrap"><table><thead><tr>${headings.map((cell) => `<th>${inlineMarkdown(cell)}</th>`).join('')}</tr></thead><tbody>${rows.map((row) => `<tr>${headings.map((_, cell) => `<td>${inlineMarkdown(row[cell] || '')}</td>`).join('')}</tr>`).join('')}</tbody></table></div>`); continue; }
    const list = line.match(/^([-*+]|\d+\.)\s+(.+)$/);
    if (list) { const ordered = /\d+\./.test(list[1]); const items = []; while (index < lines.length) { const item = lines[index].match(ordered ? /^\d+\.\s+(.+)$/ : /^[-*+]\s+(.+)$/); if (!item) break; items.push(`<li>${inlineMarkdown(item[1])}</li>`); index += 1; } out.push(`<${ordered ? 'ol' : 'ul'}>${items.join('')}</${ordered ? 'ol' : 'ul'}>`); continue; }
    if (/^>\s?/.test(line)) { const quote = []; while (index < lines.length && /^>\s?/.test(lines[index])) quote.push(lines[index++].replace(/^>\s?/, '')); out.push(`<blockquote>${inlineMarkdown(quote.join(' '))}</blockquote>`); continue; }
    if (/^---+$/.test(line)) { out.push('<hr>'); index += 1; continue; }
    const paragraph = [line]; index += 1; while (index < lines.length && !startsBlock(lines[index], lines[index + 1])) paragraph.push(lines[index++]); out.push(`<p>${inlineMarkdown(paragraph.join(' '))}</p>`);
  }
  return out.join('');
}
const changeRows = (entry) => entry.improve.map((why, index) => ({
  kind: ['SAFETY', 'SCOPE', 'EVIDENCE', 'STRUCTURE'][index] || 'CLARITY',
  before: index === 0 ? 'The submitted guidance leaves a material decision implicit.' : 'The submitted package carries detail without a clear boundary.',
  after: index === 0 ? 'The improved draft makes the operating rule explicit.' : 'The improved draft moves the decision into a smaller, reviewable contract.',
  why
}));

function visible() { return catalog.filter((item) => `${item.author} ${item.title} ${item.id} ${item.focus} ${packageSearchText(item)}`.toLowerCase().includes(state.query) || state.contentMatches.has(item.id)); }
function syncUrl() {
  const url = new URL(window.location.href);
  url.searchParams.set('author', state.selected.author);
  url.searchParams.set('skill', state.selected.id);
  url.searchParams.set('view', state.preview);
  if (state.file && state.file.name !== 'SKILL.md') url.searchParams.set('file', state.file.name); else url.searchParams.delete('file');
  if (state.preview === 'improved' && state.lens) url.searchParams.set('lens', 'changes'); else url.searchParams.delete('lens');
  if (state.rendered) url.searchParams.set('render', 'preview'); else url.searchParams.delete('render');
  if (state.diff) url.searchParams.set('compare', 'diff'); else url.searchParams.delete('compare');
  history.replaceState({}, '', url);
}
function selectFromUrl() {
  const params = new URLSearchParams(window.location.search);
  const author = params.get('author'); const id = params.get('skill'); const view = params.get('view');
  const byAuthor = author && catalog.filter((item) => item.author.toLowerCase() === author.toLowerCase());
  const byId = id && catalog.find((item) => item.id === id);
  state.selected = byId || byAuthor?.[0] || catalog[0];
  state.query = byAuthor ? state.selected.author.toLowerCase() : '';
  state.preview = view === 'improved' ? 'improved' : 'original';
  state.lens = state.preview === 'improved' && params.get('lens') === 'changes';
  state.rendered = params.get('render') === 'preview';
  state.diff = params.get('compare') === 'diff';
  state.file = packageFiles().find((item) => item.name === params.get('file')) || packageFiles()[0];
  $('#skill-filter').value = byAuthor ? state.selected.author : '';
  $('#submission-count').textContent = `${catalog.length} submissions`;
}
function renderList() {
  const items = visible();
  $('#count').textContent = state.searching ? `Searching package files… ${items.length} of ${catalog.length}` : `${items.length} of ${catalog.length} reviewed`;
  $('#skill-list').innerHTML = items.map((item) => `<button role="option" aria-selected="${item.id === state.selected.id}" class="${item.id === state.selected.id ? 'active' : ''}" data-id="${item.id}"><span>AUTHOR · ${escape(item.author)}</span><strong>${escape(item.title)}</strong><small>SKILL · ${escape(item.id)} · ${escape(item.status)}</small></button>`).join('');
  $('#skill-list').querySelectorAll('button').forEach((button) => button.addEventListener('click', () => {
    state.selected = catalog.find((item) => item.id === button.dataset.id); state.file = packageFiles()[0]; state.preview = 'original'; state.lens = false; state.rendered = false; state.diff = false; syncUrl(); renderList(); renderDetail(); loadSelectedFile();
  }));
}
async function fetchSource(entry, file) {
  if (state.sourceByPath.has(file.path)) return state.sourceByPath.get(file.path);
  try { state.sourceByPath.set(file.path, redact(await (await fetch(file.path)).text(), entry)); }
  catch { state.sourceByPath.set(file.path, '# Original preview unavailable\n\nServe this site from the repository root to load the submitted source.'); }
  return state.sourceByPath.get(file.path);
}
async function loadSelectedFile() {
  const entry = state.selected; const file = state.file;
  await fetchSource(entry, file);
  if (state.selected.id === entry.id && state.file.path === file.path) renderDetail();
  return state.sourceByPath.get(file.path);
}
function schedulePackageSearch() {
  clearTimeout(state.searchTimer); const query = state.query; const request = ++state.searchRequest; state.contentMatches.clear();
  if (query.length < 3) { state.searching = false; renderList(); return; }
  state.searchTimer = setTimeout(async () => {
    state.searching = true; renderList();
    await Promise.all(catalog.flatMap((entry) => packageFiles(entry).map((file) => fetchSource(entry, file))));
    if (request !== state.searchRequest) return;
    state.contentMatches = new Set(catalog.filter((entry) => packageFiles(entry).some((file) => state.sourceByPath.get(file.path)?.toLowerCase().includes(query))).map((entry) => entry.id));
    state.searching = false; renderList();
  }, 180);
}
function lensMarkup(entry) {
  return `<section class="change-lens" aria-label="Why this improved draft changed"><header><div><span>CHANGE LENS</span><h3>What changed — and why.</h3></div><button data-lens aria-pressed="true">Back to draft</button></header><p>The improved draft keeps the job, but narrows the decisions an agent must make from memory.</p><div class="change-rows">${changeRows(entry).map((change, index) => `<article><span>0${index + 1} / ${change.kind}</span><div><b>− Before</b><p>${escape(change.before)}</p></div><div><b>+ After</b><p>${escape(change.after)}</p></div><aside><b>Why</b><p>${escape(change.why)}</p></aside></article>`).join('')}</div></section>`;
}
function diffRows(before, after) {
  const oldLines = before.split('\n'); const newLines = after.split('\n'); const rows = []; let oldIndex = 0; let newIndex = 0;
  while (oldIndex < oldLines.length || newIndex < newLines.length) {
    if (oldLines[oldIndex] === newLines[newIndex]) { rows.push(`<p class="same"><span>${oldIndex + 1}</span>${escape(oldLines[oldIndex] || '')}</p>`); oldIndex += 1; newIndex += 1; continue; }
    const oldAhead = oldLines.slice(oldIndex + 1, oldIndex + 9).indexOf(newLines[newIndex]); const newAhead = newLines.slice(newIndex + 1, newIndex + 9).indexOf(oldLines[oldIndex]);
    if (newIndex < newLines.length && (oldIndex >= oldLines.length || (oldAhead === -1 && newAhead !== -1) || newAhead < oldAhead)) { rows.push(`<p class="added"><span>+</span>${escape(newLines[newIndex++])}</p>`); continue; }
    if (oldIndex < oldLines.length) { rows.push(`<p class="removed"><span>−</span>${escape(oldLines[oldIndex++])}</p>`); continue; }
  }
  return rows.join('');
}
function diffMarkup(entry) {
  if (state.file.name !== 'SKILL.md') return `<section class="skill-diff" aria-label="Draft comparison"><header><div><span>PACKAGE DIFF</span><h3>Supporting file unchanged.</h3></div><button data-diff aria-pressed="true">Back to draft</button></header><p>This review only rewrites the main skill contract. The selected ${escape(state.file.kind)} file remains available in its original form.</p></section>`;
  return `<section class="skill-diff" aria-label="Original and improved skill comparison"><header><div><span>SKILL DIFF</span><h3>Original → improved draft</h3></div><button data-diff aria-pressed="true">Back to draft</button></header><p>Green lines are additions; red lines are removals. Unmarked lines are shared context.</p><div class="diff-lines">${diffRows(currentSource() || 'Loading original Markdown…', entry.improved)}</div></section>`;
}
function previewMarkup(entry, available) {
  if (state.preview === 'improved' && state.lens) return lensMarkup(entry);
  if (state.diff) return diffMarkup(entry);
  const label = state.preview === 'original' ? 'ORIGINAL / SAFETY-REDACTED WHERE NEEDED' : 'IMPROVED DRAFT / PACKAGE-AWARE';
  const body = state.rendered ? `<div class="markdown-preview" aria-label="Rendered Markdown preview">${markdownMarkup(currentContent())}</div>` : `<pre><code>${escape(currentContent())}</code></pre>`;
  return `<section class="preview"><header><span>${label}</span><div>${state.preview === 'improved' ? '<button data-lens aria-pressed="false">Change lens</button>' : ''}<button data-diff aria-pressed="false">Diff</button><button data-render aria-pressed="${state.rendered}">${state.rendered ? 'Source' : 'Preview'}</button><button data-copy>Copy</button><button data-download>Download</button></div></header><nav class="file-tabs" aria-label="Skill package files">${available.map((item) => `<button class="${item.name === state.file.name ? 'active' : ''}" data-file="${escape(item.name)}"><span>${escape(item.kind)}</span>${escape(item.name)}</button>`).join('')}</nav>${body}</section>`;
}
function renderDetail() {
  const entry = state.selected; const available = packageFiles(entry);
  $('#detail').innerHTML = `<header><div><span class="status">${escape(entry.status)}</span><h2>${escape(entry.title)}</h2><p>Submitted by <a class="author-link" href="?author=${encodeURIComponent(entry.author)}">${escape(entry.author)}</a> · <a class="share-link" href="?author=${encodeURIComponent(entry.author)}&skill=${encodeURIComponent(entry.id)}&view=${state.preview}">share review ↗</a></p></div><div class="switch" role="group" aria-label="Preview version"><button class="${state.preview === 'original' ? 'active' : ''}" data-preview="original">Original</button><button class="${state.preview === 'improved' ? 'active' : ''}" data-preview="improved">Improved draft</button></div></header><div class="purpose"><span>THE JOB</span><p>${escape(entry.focus)}</p></div><div class="review-grid"><section><span>WHAT'S ALREADY WORKING</span><ul>${entry.wins.map((item) => `<li>${escape(item)}</li>`).join('')}</ul></section><section><span>HIGHEST-VALUE IMPROVEMENTS</span><ul>${entry.improve.map((item) => `<li>${escape(item)}</li>`).join('')}</ul></section></div><aside class="extras"><span>GOOD NEXT ADDITION</span><p>${escape(entry.extras)}</p></aside>${previewMarkup(entry, available)}`;
  $('#detail').querySelectorAll('[data-file]').forEach((button) => button.addEventListener('click', () => { state.file = available.find((item) => item.name === button.dataset.file) || available[0]; state.rendered = false; state.diff = false; syncUrl(); renderDetail(); loadSelectedFile(); }));
  $('#detail').querySelectorAll('[data-preview]').forEach((button) => button.addEventListener('click', () => { state.preview = button.dataset.preview; state.lens = false; state.rendered = false; state.diff = false; syncUrl(); renderDetail(); loadSelectedFile(); }));
  $('#detail').querySelectorAll('[data-lens]').forEach((button) => button.addEventListener('click', () => { state.lens = !state.lens; state.rendered = false; state.diff = false; syncUrl(); renderDetail(); }));
  $('#detail').querySelectorAll('[data-diff]').forEach((button) => button.addEventListener('click', async () => { await loadSelectedFile(); state.diff = !state.diff; state.rendered = false; state.lens = false; syncUrl(); renderDetail(); }));
  $('[data-render]')?.addEventListener('click', async () => { await loadSelectedFile(); state.rendered = !state.rendered; syncUrl(); renderDetail(); });
  $('[data-copy]')?.addEventListener('click', async () => { await loadSelectedFile(); await copy(currentContent()); $('[data-copy]').textContent = 'Copied'; });
  $('[data-download]')?.addEventListener('click', async () => { await loadSelectedFile(); download(`${entry.id}-${state.file.name.replaceAll('/', '-')}-${state.preview}.md`, currentContent()); });
}

$('#skill-filter').addEventListener('input', (event) => { state.query = event.target.value.toLowerCase().trim(); renderList(); schedulePackageSearch(); });
window.addEventListener('popstate', () => { selectFromUrl(); renderList(); renderDetail(); loadSelectedFile(); });
selectFromUrl(); renderList(); renderDetail(); loadSelectedFile();