import { marked } from 'https://esm.sh/marked@14';

const recordsEl = document.getElementById('records');
const records = recordsEl ? JSON.parse(recordsEl.textContent || '[]') : [];

const filterInput = document.querySelector('.filter');
const toggleArchived = document.querySelector('.toggle-archived');
const toggleGrouping = document.querySelector('.toggle-grouping');
const drawer = document.querySelector('.drawer');
const drawerContent = drawer?.querySelector('.drawer-content');
const drawerClose = drawer?.querySelector('.drawer-close');
const refreshInfo = document.querySelector('.refresh-info');
const header = document.querySelector('header');
const board = document.querySelector('main.board');

const generatedAt = header?.dataset.generated ? new Date(header.dataset.generated) : null;
const NEXT_TICK_MIN = 5;

const STATUS_ORDER = ['open', 'in_progress', 'paused', 'blocked', 'done'];
const STATUS_LABEL = {
  open: 'open',
  in_progress: 'in-progress',
  paused: 'paused',
  blocked: 'blocked',
  done: 'done',
};
const STATUS_EMOJI = {
  open: '⚪',
  in_progress: '🔴',
  paused: '🟡',
  blocked: '🔵',
  done: '🟢',
};

const ARCHIVE_DAYS = 14;
const DONE_VISIBLE_LIMIT = 10;

const SOLO_OWNER = (() => {
  const owners = new Set();
  for (const r of records) if (r.project_owner) owners.add(r.project_owner);
  return owners.size === 1 ? [...owners][0] : null;
})();

function escapeHtml(s) {
  return String(s)
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#39;');
}

function formatAge(iso, now) {
  if (!iso) return null;
  const then = new Date(iso);
  const diff = Math.max(0, now.getTime() - then.getTime());
  const m = Math.floor(diff / 60_000);
  if (m < 60) return `${m}m`;
  const h = Math.floor(diff / 3_600_000);
  if (h < 24) return `${h}h`;
  const d = Math.floor(diff / 86_400_000);
  if (d < 7) return `${d}d`;
  if (d < 30) return `${Math.floor(d / 7)}w`;
  let mo =
    (now.getUTCFullYear() - then.getUTCFullYear()) * 12 +
    (now.getUTCMonth() - then.getUTCMonth());
  if (now.getUTCDate() < then.getUTCDate()) mo -= 1;
  mo = Math.max(0, mo);
  if (mo < 12) return `${mo}mo`;
  return `${Math.floor(mo / 12)}y`;
}

function isArchived(rec, now) {
  if (rec.status !== 'done' || !rec.last_commit_iso) return false;
  const ms = now.getTime() - new Date(rec.last_commit_iso).getTime();
  return ms > ARCHIVE_DAYS * 86_400_000;
}

function truncate(s, max) {
  return s.length <= max ? s : s.slice(0, max) + '…';
}

function formatMskDateTime(iso) {
  const utc = new Date(iso);
  const msk = new Date(utc.getTime() + 3 * 60 * 60 * 1000);
  const pad = (n) => String(n).padStart(2, '0');
  return `${msk.getUTCFullYear()}-${pad(msk.getUTCMonth() + 1)}-${pad(msk.getUTCDate())} ${pad(msk.getUTCHours())}:${pad(msk.getUTCMinutes())} МСК`;
}

function renderCard(rec, now, mode, overflow) {
  const age = formatAge(rec.last_commit_iso, now);
  const archived = isArchived(rec, now);
  const primary = mode === 'by-project'
    ? `<span class="badge status">${STATUS_EMOJI[rec.status]} ${STATUS_LABEL[rec.status]}</span>`
    : `<span class="badge project">${escapeHtml(rec.project)}</span>`;
  const ownerPill = rec.project_owner && SOLO_OWNER === null
    ? `<span class="badge owner">${escapeHtml(rec.project_owner)}</span>`
    : '';
  const dateSpan = rec.last_commit_iso
    ? `<span class="date" title="${escapeHtml(rec.last_commit_iso)}">${escapeHtml(formatMskDateTime(rec.last_commit_iso))}</span>`
    : '';
  return `<li class="card" data-slug="${escapeHtml(rec.slug)}" data-raw-url="${escapeHtml(rec.raw_url)}" data-archived="${archived ? 'true' : 'false'}" data-overflow="${overflow ? 'true' : 'false'}">
    <div class="card-title">${escapeHtml(truncate(rec.title, 80))}</div>
    <code class="card-slug">${escapeHtml(rec.slug)}</code>
    <div class="card-meta">
      ${primary}
      ${ownerPill}
      ${dateSpan}
      ${age === null ? '' : `<span class="age">${escapeHtml(age)}</span>`}
    </div>
  </li>`;
}

function compareByIsoDesc(a, b) {
  if (!a.last_commit_iso && !b.last_commit_iso) return 0;
  if (!a.last_commit_iso) return 1;
  if (!b.last_commit_iso) return -1;
  return b.last_commit_iso.localeCompare(a.last_commit_iso);
}

function renderByStatus(now) {
  return STATUS_ORDER.map((status) => {
    let inCol = records.filter((r) => r.status === status);
    let overflowStart = -1;
    if (status === 'done') {
      inCol = [...inCol].sort(compareByIsoDesc);
      if (inCol.length > DONE_VISIBLE_LIMIT) overflowStart = DONE_VISIBLE_LIMIT;
    }
    const cards = inCol
      .map((r, i) => renderCard(r, now, 'by-status', overflowStart !== -1 && i >= overflowStart))
      .join('');
    const overflowCount = overflowStart === -1 ? 0 : inCol.length - overflowStart;
    const expander =
      overflowCount > 0
        ? `<button type="button" class="done-expander">show ${overflowCount} more</button>`
        : '';
    return `<section class="col" data-status="${status}">
      <h2>${STATUS_EMOJI[status]} ${STATUS_LABEL[status]} <span class="count">${inCol.length}</span></h2>
      <ul class="cards">${cards}</ul>${expander}
    </section>`;
  }).join('');
}

function renderByProject(now) {
  const projects = [...new Set(records.map((r) => r.project))].sort();
  return projects.map((project) => {
    const inCol = records
      .filter((r) => r.project === project)
      .sort((a, b) => STATUS_ORDER.indexOf(a.status) - STATUS_ORDER.indexOf(b.status));
    const cards = inCol.map((r) => renderCard(r, now, 'by-project', false)).join('');
    return `<section class="col" data-project="${escapeHtml(project)}">
      <h2>${escapeHtml(project)} <span class="count">${inCol.length}</span></h2>
      <ul class="cards">${cards}</ul>
    </section>`;
  }).join('');
}

function rerender() {
  if (!board) return;
  const now = new Date();
  const byProject = toggleGrouping?.checked;
  board.innerHTML = byProject ? renderByProject(now) : renderByStatus(now);
  if (filterInput) applyFilter(filterInput.value);
}

function relativeMin(ms) {
  return Math.max(0, Math.floor(ms / 60000));
}

function updateRefreshInfo() {
  if (!refreshInfo || !generatedAt) return;
  const ageMin = relativeMin(Date.now() - generatedAt.getTime());
  const nextMin = Math.max(0, NEXT_TICK_MIN - ageMin);
  refreshInfo.textContent = `refreshed ${ageMin}m ago · next in ${nextMin}m`;
}
updateRefreshInfo();
setInterval(updateRefreshInfo, 30_000);

const recordsBySlug = new Map(records.map((r) => [r.slug, r]));
const activeStatuses = new Set();

function applyFilter(query) {
  const q = query.trim().toLowerCase();
  document.querySelectorAll('.card').forEach((card) => {
    const slug = card.dataset.slug || '';
    const rec = recordsBySlug.get(slug);
    if (!rec) {
      card.dataset.hidden = 'true';
      return;
    }
    const textHay = [
      rec.slug,
      rec.title,
      rec.project,
      rec.project_owner ?? '',
      rec.status,
    ]
      .join(' ')
      .toLowerCase();
    const textMatch = q === '' || textHay.includes(q);
    const statusMatch = activeStatuses.size === 0 || activeStatuses.has(rec.status);
    card.dataset.hidden = textMatch && statusMatch ? 'false' : 'true';
  });
}

filterInput?.addEventListener('input', (e) => {
  applyFilter(e.target.value);
});

document.querySelectorAll('.status-filter').forEach((btn) => {
  btn.addEventListener('click', () => {
    const s = btn.dataset.status;
    if (!s) return;
    if (activeStatuses.has(s)) {
      activeStatuses.delete(s);
      btn.classList.remove('active');
    } else {
      activeStatuses.add(s);
      btn.classList.add('active');
    }
    applyFilter(filterInput?.value || '');
  });
});

toggleArchived?.addEventListener('change', (e) => {
  document.body.classList.toggle('show-archived', e.target.checked);
});

toggleGrouping?.addEventListener('change', () => {
  document.body.classList.toggle('group-by-project', toggleGrouping.checked);
  rerender();
});

function openDrawer(card) {
  if (!drawer || !drawerContent) return;
  const slug = card.dataset.slug || '';
  const rec = recordsBySlug.get(slug);
  drawer.hidden = false;
  if (!rec) {
    drawerContent.innerHTML = `<h2>${escapeHtml(slug)}</h2><p>record not found.</p>`;
    return;
  }
  const md = rec.md_content;
  if (md === null || md === undefined) {
    drawerContent.innerHTML =
      `<h2>${escapeHtml(slug)}</h2>` +
      `<p class="drawer-empty">No per-task <code>.md</code> file in repo — status block only.</p>` +
      renderStatusBlock(rec);
    return;
  }
  drawerContent.innerHTML = `<h2>${escapeHtml(slug)}</h2>` + marked.parse(md);
}

function renderStatusBlock(rec) {
  const rows = [
    ['Status', `${STATUS_EMOJI[rec.status]} ${STATUS_LABEL[rec.status]}`],
    ['Title', rec.title],
    ['Where stopped', rec.where_stopped],
    ['Next action', rec.next_action],
    ['Blocker', rec.blocker],
    ['Branch', rec.branch],
  ];
  return (
    '<dl class="status-block">' +
    rows
      .filter(([, v]) => v !== null && v !== undefined && v !== '')
      .map(
        ([k, v]) =>
          `<dt>${escapeHtml(k)}</dt><dd>${escapeHtml(String(v))}</dd>`,
      )
      .join('') +
    '</dl>'
  );
}

document.addEventListener('click', (e) => {
  const expander = e.target.closest?.('.done-expander');
  if (expander) {
    const col = expander.closest('.col');
    if (!col) return;
    if (!expander.dataset.original) expander.dataset.original = expander.textContent;
    const expanded = col.classList.toggle('show-overflow');
    expander.textContent = expanded ? 'collapse' : expander.dataset.original;
    return;
  }
  const card = e.target.closest?.('.card');
  if (card) openDrawer(card);
});

drawerClose?.addEventListener('click', () => {
  if (drawer) drawer.hidden = true;
});

document.addEventListener('keydown', (e) => {
  if (e.key === 'Escape' && drawer) drawer.hidden = true;
});

console.log(`board-viewer: ${records.length} records loaded`);