'use strict';
/**
 * NetOps To-Do — frontend.
 * Vanlig JS uten rammeverk (bevisst, lett å patche). All data via REST-API;
 * sanntidsoppdateringer, presence og "redigerer nå" via WebSocket.
 */

// ---------- Konstanter ----------
const CATEGORIES = [
  { id: 'L1',    name: 'L1 Fysisk',          desc: 'Kabling, fiber, patch, SFP, rack' },
  { id: 'L2',    name: 'L2 Switching',       desc: 'VLAN, STP, MAC, trunking' },
  { id: 'L3',    name: 'L3 Ruting',          desc: 'OSPF, ISIS, statisk, VRF' },
  { id: 'L4',    name: 'L4 Lastbalansering', desc: 'HAProxy, NGINX, F5, BIG-IP' },
  { id: 'BGP',   name: 'BGP',                desc: 'iBGP / eBGP, policies, RR' },
  { id: 'PEER',  name: 'Peering / IX',       desc: 'IXP, private peering, PeeringDB' },
  { id: 'SEC',   name: 'Firewall / Security',desc: 'ACL, firewall, IPS, audit' },
  { id: 'NMS',   name: 'Overvåking / NMS',   desc: 'LibreNMS, Grafana, alerts' },
  { id: 'AUTO',  name: 'Automatisering',     desc: 'Ansible, scripts, CI/CD' },
  { id: 'DOC',   name: 'Dokumentasjon',      desc: 'Diagrammer, IPAM, runbooks' },
  { id: 'INC',   name: 'Incident / On-call', desc: 'Feilsøking, postmortem' },
  { id: 'PROJ',  name: 'Prosjekt / Plan',    desc: 'Design, anskaffelse, oppgraderinger' },
];
const CAT_COLORS = {
  L1: '#ff9f43', L2: '#4fc3f7', L3: '#7fb8ff', L4: '#bb86fc',
  BGP: '#4ade80', PEER: '#26de81', SEC: '#ff5370', NMS: '#ffd93d',
  AUTO: '#00d2d3', DOC: '#a0a0a0', INC: '#ff6b6b', PROJ: '#8172B3'
};
const STATUS_LABELS = { todo: 'Å gjøre', progress: 'Pågår', blocked: 'Blokkert', done: 'Ferdig' };
const PRIO_ORDER = { P1: 1, P2: 2, P3: 3, P4: 4 };
const BOARD_COLS = ['todo', 'progress', 'blocked', 'done'];
const ACT_META = {
  create:  { icon: '＋', verb: 'opprettet' },
  update:  { icon: '✎', verb: 'endret' },
  done:    { icon: '✓', verb: 'fullførte' },
  reopen:  { icon: '↺', verb: 'gjenåpnet' },
  delete:  { icon: '✕', verb: 'slettet' },
  comment: { icon: '💬', verb: 'kommenterte' },
  import:  { icon: '⬆', verb: 'importerte' },
  seed:    { icon: '◇', verb: 'lastet eksempeldata' },
};

// ---------- State ----------
const state = {
  user: 'anon',
  canSetName: false,
  tasks: [],
  activity: [],
  knownUsers: [],
  online: [],
  editingMap: {},          // taskId -> [brukere med modal åpen]
  filters: { status: 'open', category: 'all', priority: 'all', owner: 'all', search: '' },
  sort: { field: 'priority', dir: 'asc' },
  view: 'board',
  editingId: null,         // id i åpen modal (null = ny oppgave)
  editingBaseV: null,      // versjonen modalen redigerer fra
  wsOk: false,
};
let charts = {};
let ws = null;
let wsRetry = 0;
let fallbackPoll = null;
const flashIds = new Set(); // ids som skal blinke ved neste render (endret av andre)

const $ = id => document.getElementById(id);

// ---------- Persistens av UI-valg ----------
function loadPrefs() {
  try {
    const p = JSON.parse(localStorage.getItem('netops.prefs') || '{}');
    if (p.filters) Object.assign(state.filters, p.filters);
    if (p.sort) state.sort = p.sort;
    if (p.view === 'table' || p.view === 'board') state.view = p.view;
  } catch { /* ignorer korrupt localStorage */ }
}
function savePrefs() {
  localStorage.setItem('netops.prefs', JSON.stringify({
    filters: state.filters, sort: state.sort, view: state.view,
  }));
}

// ---------- API ----------
async function api(method, path, body = null) {
  const opts = { method, headers: {} };
  if (body !== null) {
    opts.headers['Content-Type'] = 'application/json';
    opts.body = JSON.stringify(body);
  }
  const res = await fetch(path, opts);
  const ct = res.headers.get('content-type') || '';
  if (!ct.includes('application/json')) {
    throw new Error(`Uventet svar fra server (HTTP ${res.status})`);
  }
  const data = await res.json();
  if (!res.ok) {
    const err = new Error(data.error || `HTTP ${res.status}`);
    err.status = res.status;
    err.data = data;
    throw err;
  }
  return data;
}

// ---------- Toast ----------
function toast(msg, opts = {}) {
  const stack = $('toast-stack');
  const el = document.createElement('div');
  el.className = 'toast' + (opts.kind ? ' ' + opts.kind : '');
  const span = document.createElement('span');
  span.textContent = msg;
  el.appendChild(span);
  if (opts.action) {
    const btn = document.createElement('button');
    btn.textContent = opts.action.label;
    btn.addEventListener('click', () => { el.remove(); opts.action.fn(); });
    el.appendChild(btn);
  }
  stack.appendChild(el);
  setTimeout(() => el.remove(), opts.ttl || 3500);
}

// ---------- Utils ----------
function escapeHtml(s) {
  return String(s ?? '').replace(/[&<>"']/g, m => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' })[m]);
}
function todayISO(offsetDays = 0) {
  const d = new Date(); d.setDate(d.getDate() + offsetDays);
  return d.toISOString().slice(0, 10);
}
function formatDeadline(dateStr) {
  if (!dateStr) return { text: '—', cls: '' };
  const d = new Date(dateStr);
  const today = new Date(); today.setHours(0, 0, 0, 0);
  const diff = Math.round((d - today) / 86400000);
  if (diff < 0) return { text: `${Math.abs(diff)}d forfalt`, cls: 'overdue' };
  if (diff === 0) return { text: 'I dag', cls: 'soon' };
  if (diff === 1) return { text: 'I morgen', cls: 'soon' };
  if (diff <= 3) return { text: `${diff}d igjen`, cls: 'soon' };
  return { text: dateStr, cls: '' };
}
function relTime(iso) {
  const diff = (Date.now() - Date.parse(iso)) / 1000;
  if (diff < 60) return 'nå nettopp';
  if (diff < 3600) return `${Math.floor(diff / 60)} min siden`;
  if (diff < 86400) return `${Math.floor(diff / 3600)} t siden`;
  const d = new Date(iso);
  return d.toLocaleString('nb-NO', { day: '2-digit', month: 'short', hour: '2-digit', minute: '2-digit' });
}
function findTask(id) { return state.tasks.find(t => t.id === id); }
function upsertTask(task) {
  const idx = state.tasks.findIndex(t => t.id === task.id);
  if (idx >= 0) state.tasks[idx] = task; else state.tasks.push(task);
}
function pushActivity(entry) {
  if (!entry) return;
  state.activity.unshift(entry);
  if (state.activity.length > 400) state.activity.length = 400;
}

// ---------- WebSocket ----------
function connectWS() {
  const proto = location.protocol === 'https:' ? 'wss' : 'ws';
  ws = new WebSocket(`${proto}://${location.host}/ws`);

  ws.onopen = () => {
    wsRetry = 0;
    state.wsOk = true;
    setConnStatus(true);
    if (fallbackPoll) { clearInterval(fallbackPoll); fallbackPoll = null; }
  };

  ws.onmessage = ev => {
    let msg;
    try { msg = JSON.parse(ev.data); } catch { return; }
    handleWSMessage(msg);
  };

  ws.onclose = () => {
    state.wsOk = false;
    setConnStatus(false);
    // Fallback: poll mens WS er nede, og prøv å koble til igjen med backoff.
    if (!fallbackPoll) fallbackPoll = setInterval(refreshState, 30000);
    const delay = Math.min(15000, 1000 * Math.pow(2, wsRetry++));
    setTimeout(connectWS, delay);
  };

  ws.onerror = () => ws.close();
}

function sendWS(obj) {
  if (ws && ws.readyState === WebSocket.OPEN) ws.send(JSON.stringify(obj));
}

function setConnStatus(ok) {
  const dot = $('conn-dot');
  const txt = $('conn-text');
  if (ok) {
    dot.className = 'live';
    txt.textContent = 'live · sanntidssynk aktiv';
  } else {
    dot.className = 'off';
    txt.textContent = 'frakoblet · prøver igjen …';
  }
}

function handleWSMessage(msg) {
  switch (msg.type) {
    case 'hello':
      state.user = msg.user;
      state.online = msg.online || [];
      state.editingMap = msg.editing || {};
      renderHeader();
      break;

    case 'sync':
      state.tasks = msg.tasks || [];
      state.activity = msg.activity || [];
      if (msg.by && msg.by !== state.user) toast(`${msg.by} erstattet oppgavelisten (import)`);
      renderAll();
      break;

    case 'presence':
      state.online = msg.online || [];
      renderHeader();
      break;

    case 'editing':
      state.editingMap = msg.editing || {};
      renderView();
      updateModalWarning();
      break;

    case 'task': {
      const mine = msg.by === state.user;
      pushActivity(msg.activity);
      if (msg.op === 'delete') {
        state.tasks = state.tasks.filter(t => t.id !== msg.id);
        if (!mine && state.editingId === msg.id) {
          closeModal();
          toast(`Oppgaven du redigerte ble slettet av ${msg.by}`, { kind: 'warn', ttl: 6000 });
        }
      } else if (msg.task) {
        upsertTask(msg.task);
        if (!mine) {
          flashIds.add(msg.task.id);
          // Noen andre lagret oppgaven jeg har åpen i modal → varsle, ikke overskriv skjemaet.
          if (state.editingId === msg.task.id) updateModalWarning(msg.by);
          if (state.editingId === msg.task.id) renderComments(msg.task);
        }
      }
      renderAll();
      break;
    }
  }
}

// ---------- Hent state via REST (init + fallback) ----------
async function refreshState() {
  try {
    const data = await api('GET', '/api/state');
    state.user = data.user;
    state.canSetName = !!data.canSetName;
    state.tasks = data.tasks || [];
    state.activity = data.activity || [];
    state.knownUsers = data.known_users || [];
    state.online = data.online || [];
    renderAll();
  } catch (e) {
    toast('Kunne ikke laste: ' + e.message, { kind: 'err' });
  }
}

// ---------- Quick add ----------
function parseQuickAdd(text) {
  const out = { title: '', tags: [] };
  const words = [];
  for (const tok of text.trim().split(/\s+/)) {
    if (!tok) continue;
    let m;
    if (/^p[1-4]$/i.test(tok)) { out.priority = tok.toUpperCase(); continue; }
    if ((m = tok.match(/^#(.+)$/))) {
      const cat = CATEGORIES.find(c => c.id.toLowerCase() === m[1].toLowerCase());
      if (cat && !out.category) out.category = cat.id;
      else out.tags.push(m[1]);
      continue;
    }
    if ((m = tok.match(/^@(.+)$/))) {
      out.owner = m[1].toLowerCase() === 'me' ? state.user : m[1];
      continue;
    }
    if ((m = tok.match(/^!(.+)$/))) {
      const v = m[1].toLowerCase();
      if (/^\d{4}-\d{2}-\d{2}$/.test(v)) out.deadline = v;
      else if ((m = v.match(/^\+(\d{1,3})d?$/))) out.deadline = todayISO(Number(m[1]));
      else if (v === 'idag' || v === 'today') out.deadline = todayISO(0);
      else if (v === 'imorgen' || v === 'tomorrow') out.deadline = todayISO(1);
      continue;
    }
    if ((m = tok.match(/^~(\d+(?:[.,]\d+)?)t?h?$/i))) { out.estHours = parseFloat(m[1].replace(',', '.')); continue; }
    if ((m = tok.match(/^loc:(.+)$/i))) { out.location = m[1]; continue; }
    words.push(tok);
  }
  out.title = words.join(' ');
  return out;
}

function renderQuickAddPreview() {
  const text = $('quickadd-input').value;
  const el = $('quickadd-preview');
  if (!text.trim()) { el.innerHTML = ''; return; }
  const p = parseQuickAdd(text);
  const chips = [];
  const chip = (label, val) => `<span class="qa-chip">${label} <b>${escapeHtml(val)}</b></span>`;
  chips.push(chip('tittel', p.title || '(mangler)'));
  if (p.category) chips.push(chip('kategori', (CATEGORIES.find(c => c.id === p.category) || {}).name || p.category));
  if (p.priority) chips.push(chip('prio', p.priority));
  if (p.owner) chips.push(chip('eier', p.owner));
  if (p.deadline) chips.push(chip('frist', p.deadline));
  if (p.estHours != null) chips.push(chip('est', p.estHours + 't'));
  if (p.location) chips.push(chip('lokasjon', p.location));
  if (p.tags.length) chips.push(chip('tags', p.tags.join(', ')));
  el.innerHTML = chips.join('');
}

async function submitQuickAdd() {
  const input = $('quickadd-input');
  const p = parseQuickAdd(input.value);
  if (!p.title) { toast('Skriv en tittel først', { kind: 'warn' }); return; }
  try {
    const { task } = await api('POST', '/api/tasks', p);
    upsertTask(task);
    input.value = '';
    renderQuickAddPreview();
    renderAll();
    toast('Opprettet: ' + p.title.slice(0, 40));
  } catch (e) { toast('Feil: ' + e.message, { kind: 'err' }); }
}

// ---------- Filtrering / sortering ----------
function applyFilters(tasks, { ignoreStatus = false } = {}) {
  const f = state.filters;
  return tasks.filter(t => {
    if (!ignoreStatus) {
      if (f.status === 'open') { if (t.status === 'done') return false; }
      else if (f.status !== 'all' && t.status !== f.status) return false;
    }
    if (f.category !== 'all' && t.category !== f.category) return false;
    if (f.priority !== 'all' && t.priority !== f.priority) return false;
    if (f.owner === '__me__') { if ((t.owner || '') !== state.user) return false; }
    else if (f.owner === '__unassigned__') { if (t.owner) return false; }
    else if (f.owner !== 'all') { if ((t.owner || '') !== f.owner) return false; }
    if (f.search) {
      const q = f.search.toLowerCase();
      const hay = [t.title, t.desc, t.location, t.owner, (t.tags || []).join(' ')].join(' ').toLowerCase();
      if (!hay.includes(q)) return false;
    }
    return true;
  });
}

function sortTasks(tasks) {
  const { field, dir } = state.sort;
  const sign = dir === 'asc' ? 1 : -1;
  return [...tasks].sort((a, b) => {
    let av = a[field], bv = b[field];
    if (field === 'priority') { av = PRIO_ORDER[av]; bv = PRIO_ORDER[bv]; }
    if (field === 'deadline') { av = av || '9999'; bv = bv || '9999'; }
    if (field === 'estHours') { av = av || 0; bv = bv || 0; }
    if (av == null) av = '';
    if (bv == null) bv = '';
    if (av < bv) return -1 * sign;
    if (av > bv) return 1 * sign;
    return 0;
  });
}

// ---------- Render ----------
function renderAll() {
  renderHeader();
  renderKPIs();
  renderCharts();
  renderView();
  renderActivity();
  updateOwnerSelects();
}

function renderHeader() {
  $('user-chip').textContent = state.user;
  $('user-chip').className = 'user-chip' + (state.canSetName ? ' clickable' : '');
  $('anon-banner').className = 'anon-banner' + (state.user === 'anon' && state.canSetName ? ' show' : '');
  const others = state.online.filter(u => u !== state.user);
  $('online-row').innerHTML = others.length
    ? others.slice(0, 6).map(u => `<span class="online-chip">${escapeHtml(u)}</span>`).join('')
      + (others.length > 6 ? `<span class="online-chip">+${others.length - 6}</span>` : '')
    : '';
}

function renderKPIs() {
  const open = state.tasks.filter(t => t.status !== 'done');
  const mine = open.filter(t => (t.owner || '') === state.user);
  const p1 = open.filter(t => t.priority === 'P1').length;
  const hours = open.reduce((s, t) => s + (t.estHours || 0), 0);
  const today = todayISO();
  const overdue = open.filter(t => t.deadline && t.deadline < today).length;
  const weekAgo = todayISO(-7);
  const done7 = state.tasks.filter(t => t.status === 'done' && t.completed && t.completed >= weekAgo).length;

  $('kpi-open').textContent = open.length;
  $('kpi-open-sub').textContent = `av ${state.tasks.length} totalt`;
  $('kpi-mine').textContent = mine.length;
  const mineHours = mine.reduce((s, t) => s + (t.estHours || 0), 0);
  $('kpi-mine-sub').textContent = mineHours > 0 ? `≈ ${fmtHours(mineHours)} arbeid` : 'tildelt meg';
  $('kpi-p1').textContent = p1;
  $('kpi-hours').textContent = fmtHours(hours);
  $('kpi-hours-sub').textContent = hours > 8 ? `≈ ${(hours / 8).toFixed(1)} arbeidsdager` : 'arbeidstimer';
  $('kpi-overdue').textContent = overdue;
  $('kpi-done').textContent = done7;
}
function fmtHours(h) { return h.toFixed(1).replace(/\.0$/, '') + 't'; }

function renderCharts() {
  if (typeof Chart === 'undefined') { $('chart-row').style.display = 'none'; return; }
  const open = state.tasks.filter(t => t.status !== 'done');

  const byCat = {};
  open.forEach(t => { byCat[t.category] = (byCat[t.category] || 0) + 1; });
  const catEntries = Object.entries(byCat).sort((a, b) => b[1] - a[1]);
  $('cat-total').textContent = `${open.length} åpne`;

  const byPrio = { P1: 0, P2: 0, P3: 0, P4: 0 };
  open.forEach(t => { byPrio[t.priority]++; });

  const byOwner = {};
  open.forEach(t => {
    const o = t.owner || '(utildelt)';
    byOwner[o] = (byOwner[o] || 0) + 1;
  });
  const ownerEntries = Object.entries(byOwner).sort((a, b) => b[1] - a[1]).slice(0, 10);

  Object.values(charts).forEach(c => c && c.destroy());
  const commonFont = { family: "-apple-system, 'Segoe UI', sans-serif", size: 11 };
  const barOpts = {
    indexAxis: 'y', responsive: true, maintainAspectRatio: false,
    plugins: {
      legend: { display: false },
      tooltip: { callbacks: { label: ctx => `${ctx.parsed.x} oppgave${ctx.parsed.x === 1 ? '' : 'r'}` } }
    },
    scales: {
      x: { beginAtZero: true, ticks: { color: '#8b98a9', font: commonFont, stepSize: 1 }, grid: { color: '#2a3340' } },
      y: { ticks: { color: '#e6edf3', font: commonFont }, grid: { display: false } }
    }
  };

  charts.cat = new Chart($('catChart'), {
    type: 'bar',
    data: {
      labels: catEntries.map(([k]) => (CATEGORIES.find(c => c.id === k) || { name: k }).name),
      datasets: [{
        data: catEntries.map(([, v]) => v),
        backgroundColor: catEntries.map(([k]) => (CAT_COLORS[k] || '#666') + 'CC'),
        borderColor: catEntries.map(([k]) => CAT_COLORS[k] || '#666'),
        borderWidth: 1, borderRadius: 4,
      }]
    },
    options: barOpts,
  });

  charts.prio = new Chart($('prioChart'), {
    type: 'doughnut',
    data: {
      labels: ['P1 Kritisk', 'P2 Høy', 'P3 Middels', 'P4 Lav'],
      datasets: [{
        data: [byPrio.P1, byPrio.P2, byPrio.P3, byPrio.P4],
        backgroundColor: ['#ff5370CC', '#ff9f43CC', '#ffd93dCC', '#7fb8ffCC'],
        borderColor: '#1a212b', borderWidth: 2,
      }]
    },
    options: {
      responsive: true, maintainAspectRatio: false, cutout: '60%',
      plugins: {
        legend: { position: 'right', labels: { color: '#e6edf3', font: commonFont, usePointStyle: true, padding: 12 } },
        tooltip: { callbacks: { label: ctx => {
          const tot = ctx.dataset.data.reduce((a, b) => a + b, 0);
          const pct = tot ? ((ctx.parsed / tot) * 100).toFixed(0) : 0;
          return `${ctx.label}: ${ctx.parsed} (${pct}%)`;
        } } }
      }
    }
  });

  charts.owner = new Chart($('ownerChart'), {
    type: 'bar',
    data: {
      labels: ownerEntries.map(([k]) => k),
      datasets: [{
        data: ownerEntries.map(([, v]) => v),
        backgroundColor: ownerEntries.map(([k]) => k === state.user ? '#4ade80CC' : '#bb86fcCC'),
        borderColor: ownerEntries.map(([k]) => k === state.user ? '#4ade80' : '#bb86fc'),
        borderWidth: 1, borderRadius: 4,
      }]
    },
    options: barOpts,
  });
}

function renderView() {
  $('view-board').className = state.view === 'board' ? 'active-view' : '';
  $('view-table').className = state.view === 'table' ? 'active-view' : '';
  $('fg-status').style.display = state.view === 'board' ? 'none' : '';
  $('board').style.display = state.view === 'board' ? '' : 'none';
  $('table-panel').style.display = state.view === 'table' ? '' : 'none';
  if (state.view === 'board') renderBoard(); else renderTable();
  flashIds.clear();
}

// Felles småbiter for kort og rader
function ownerBadge(t) {
  const cls = !t.owner ? 'unassigned' : (t.owner === state.user ? 'me' : '');
  return `<span class="owner-badge ${cls}">${t.owner ? escapeHtml(t.owner) : 'utildelt'}</span>`;
}
function catBadge(t) {
  const cat = CATEGORIES.find(c => c.id === t.category);
  const col = CAT_COLORS[t.category] || '#4fc3f7';
  return `<span class="cat-badge" style="color:${col};border-color:${col}40;background:${col}15" title="${cat ? escapeHtml(cat.desc) : ''}">${escapeHtml(t.category)}</span>`;
}
function editingTag(t) {
  const editors = (state.editingMap[t.id] || []).filter(u => u !== state.user);
  return editors.length ? `<span class="card-editing" title="Redigeres nå av ${escapeHtml(editors.join(', '))}">✎ ${escapeHtml(editors[0])}</span>` : '';
}

function renderBoard() {
  const filtered = applyFilters(state.tasks, { ignoreStatus: true });
  const board = $('board');
  const showEmpty = state.tasks.length === 0;
  $('empty').style.display = showEmpty ? 'block' : 'none';
  $('empty-seed').style.display = showEmpty ? 'block' : 'none';

  board.innerHTML = BOARD_COLS.map(status => {
    let items = filtered.filter(t => t.status === status);
    let moreNote = '';
    if (status === 'done') {
      items.sort((a, b) => (b.completed || '').localeCompare(a.completed || ''));
      if (items.length > 15) {
        moreNote = `<div class="board-more">+ ${items.length - 15} eldre ferdige (se tabell-visning)</div>`;
        items = items.slice(0, 15);
      }
    } else {
      items.sort((a, b) =>
        (PRIO_ORDER[a.priority] - PRIO_ORDER[b.priority])
        || (a.deadline || '9999').localeCompare(b.deadline || '9999'));
    }
    const est = items.reduce((s, t) => s + (t.estHours || 0), 0);
    return `
      <div class="board-col" data-status="${status}">
        <div class="board-col-head">
          <h3>${STATUS_LABELS[status]}</h3>
          <span class="col-meta">${items.length}${est > 0 && status !== 'done' ? ` · ${fmtHours(est)}` : ''}</span>
        </div>
        <div class="board-col-body" data-status="${status}">
          ${items.map(renderCard).join('')}
          ${moreNote}
        </div>
      </div>`;
  }).join('');

  bindBoardDnD();
}

function renderCard(t) {
  const dl = formatDeadline(t.deadline);
  const flash = flashIds.has(t.id) ? ' flash' : '';
  const doneCls = t.status === 'done' ? ' done-card' : '';
  const tags = (t.tags || []).slice(0, 4).map(tag => `<span class="tag-chip">#${escapeHtml(tag)}</span>`).join(' ');
  return `
    <div class="card${flash}${doneCls}" draggable="true" data-id="${t.id}">
      ${editingTag(t)}
      <div class="card-top">
        <span class="badge prio-${t.priority}">${t.priority}</span>
        ${catBadge(t)}
        ${t.location ? `<span class="tag-chip" style="margin-left:auto">${escapeHtml(t.location)}</span>` : ''}
      </div>
      <div class="card-title" onclick="openEdit('${t.id}')">${escapeHtml(t.title)}</div>
      <div class="card-meta">
        ${ownerBadge(t)}
        ${t.deadline ? `<span class="time-cell ${dl.cls}">${dl.text}</span>` : ''}
        ${t.estHours ? `<span>~${t.estHours}t</span>` : ''}
        ${t.comments && t.comments.length ? `<span class="comment-count">💬 ${t.comments.length}</span>` : ''}
        ${tags}
      </div>
    </div>`;
}

function bindBoardDnD() {
  document.querySelectorAll('.card[draggable]').forEach(card => {
    card.addEventListener('dragstart', e => {
      e.dataTransfer.setData('text/plain', card.dataset.id);
      e.dataTransfer.effectAllowed = 'move';
      card.classList.add('dragging');
    });
    card.addEventListener('dragend', () => card.classList.remove('dragging'));
  });
  document.querySelectorAll('.board-col').forEach(col => {
    col.addEventListener('dragover', e => { e.preventDefault(); col.classList.add('drag-over'); });
    col.addEventListener('dragleave', () => col.classList.remove('drag-over'));
    col.addEventListener('drop', e => {
      e.preventDefault();
      col.classList.remove('drag-over');
      const id = e.dataTransfer.getData('text/plain');
      moveTask(id, col.dataset.status);
    });
  });
}

async function moveTask(id, status) {
  const t = findTask(id);
  if (!t || t.status === status) return;
  const prev = t.status;
  t.status = status; // optimistisk — broadcast/svar korrigerer
  renderAll();
  try {
    const { task } = await api('PUT', `/api/tasks/${id}`, { ...t, status, v: t.v });
    upsertTask(task);
    renderAll();
  } catch (e) {
    t.status = prev;
    renderAll();
    handleSaveError(e, id);
  }
}

function renderTable() {
  const filtered = sortTasks(applyFilters(state.tasks));
  const tbody = $('tbl-body');
  $('tbl-count').textContent = filtered.length;

  const showEmpty = filtered.length === 0;
  $('empty').style.display = showEmpty ? 'block' : 'none';
  $('empty-seed').style.display = state.tasks.length === 0 ? 'block' : 'none';
  if (showEmpty) { tbody.innerHTML = ''; return; }

  tbody.innerHTML = filtered.map(t => {
    const dl = formatDeadline(t.deadline);
    const flash = flashIds.has(t.id) ? ' flash' : '';
    const tags = (t.tags || []).map(tag => `<span class="tag-chip">#${escapeHtml(tag)}</span>`).join(' ');
    const editors = (state.editingMap[t.id] || []).filter(u => u !== state.user);
    return `
      <tr class="status-${t.status}${flash}" data-id="${t.id}">
        <td><span class="badge prio-${t.priority}">${t.priority}</span></td>
        <td>
          <div class="task-title" onclick="openEdit('${t.id}')">${escapeHtml(t.title)}
            ${t.comments && t.comments.length ? `<span class="comment-count">💬${t.comments.length}</span>` : ''}
            ${editors.length ? `<span class="editing-tag">✎ ${escapeHtml(editors.join(', '))} redigerer</span>` : ''}
          </div>
          ${t.desc ? `<div class="task-desc">${escapeHtml(t.desc.slice(0, 160))}${t.desc.length > 160 ? '…' : ''}</div>` : ''}
          ${tags ? `<div style="margin-top:4px">${tags}</div>` : ''}
        </td>
        <td>${catBadge(t)}</td>
        <td><span class="status-badge status-${t.status}">${STATUS_LABELS[t.status] || t.status}</span></td>
        <td>${ownerBadge(t)}</td>
        <td style="font-family:var(--mono);font-size:12px;color:var(--text-dim)">${escapeHtml(t.location || '—')}</td>
        <td style="text-align:right;font-family:var(--mono)">${t.estHours || '—'}</td>
        <td class="time-cell ${dl.cls}">${dl.text}</td>
        <td>
          <div class="row-actions">
            ${t.status !== 'done'
              ? `<button class="icon-btn do" onclick="markDone('${t.id}')" title="Marker ferdig">✓</button>`
              : `<button class="icon-btn" onclick="reopenTask('${t.id}')" title="Gjenåpne">↺</button>`}
            <button class="icon-btn" onclick="openEdit('${t.id}')" title="Rediger">✎</button>
            ${!t.owner ? `<button class="icon-btn do" onclick="claimTask('${t.id}')" title="Ta eierskap">👤</button>` : ''}
            <button class="icon-btn del" onclick="deleteTask('${t.id}')" title="Slett">🗑</button>
          </div>
        </td>
      </tr>`;
  }).join('');
}

function renderActivity() {
  const body = $('drawer-body');
  if (!state.activity.length) {
    body.innerHTML = '<div class="act-entry" style="color:var(--text-faint)">Ingen aktivitet ennå.</div>';
    return;
  }
  body.innerHTML = state.activity.slice(0, 150).map(a => {
    const meta = ACT_META[a.action] || { icon: '·', verb: a.action };
    const titleHtml = a.taskId && findTask(a.taskId)
      ? `<span class="act-task" onclick="openEdit('${a.taskId}')">${escapeHtml(a.title)}</span>`
      : `<span style="color:var(--text-dim)">${escapeHtml(a.title || '')}</span>`;
    const detail = (a.detail || []).join(' · ');
    return `
      <div class="act-entry">
        <div class="act-line">
          <span class="act-icon">${meta.icon}</span>
          <span class="act-text"><span class="act-user">${escapeHtml(a.user)}</span> ${meta.verb} ${titleHtml}</span>
        </div>
        ${detail ? `<div class="act-detail">${escapeHtml(detail)}</div>` : ''}
        <div class="act-time">${relTime(a.at)}</div>
      </div>`;
  }).join('');
}

function updateOwnerSelects() {
  const users = new Set(state.knownUsers);
  state.tasks.forEach(t => { if (t.owner) users.add(t.owner); });
  state.online.forEach(u => users.add(u));
  const sorted = [...users].sort();

  const sel = $('f-owner');
  const current = state.filters.owner;
  sel.innerHTML = '<option value="all">Alle</option><option value="__me__">Meg</option><option value="__unassigned__">Utildelt</option>'
    + sorted.map(u => `<option value="${escapeHtml(u)}">${escapeHtml(u)}</option>`).join('');
  const ok = [...sel.options].some(o => o.value === current);
  sel.value = ok ? current : 'all';
  if (!ok) state.filters.owner = 'all';

  const msel = $('f-owner-select');
  msel.innerHTML = '<option value="">— velg —</option>'
    + sorted.map(u => `<option value="${escapeHtml(u)}">${escapeHtml(u)}</option>`).join('');
}

// ---------- Hurtighandlinger (rad/kort) ----------
async function quickStatus(id, status) {
  const t = findTask(id);
  if (!t) return;
  try {
    const { task } = await api('PUT', `/api/tasks/${id}`, { ...t, status, v: t.v });
    upsertTask(task);
    renderAll();
  } catch (e) { handleSaveError(e, id); }
}
window.markDone   = id => quickStatus(id, 'done');
window.reopenTask = id => quickStatus(id, 'todo');

window.claimTask = async function (id) {
  const t = findTask(id);
  if (!t) return;
  try {
    const { task } = await api('PUT', `/api/tasks/${id}`, { ...t, owner: state.user, v: t.v });
    upsertTask(task);
    renderAll();
    toast(`Du eier nå "${task.title.slice(0, 30)}${task.title.length > 30 ? '…' : ''}"`);
  } catch (e) { handleSaveError(e, id); }
};

window.deleteTask = async function (id) {
  const t = findTask(id);
  if (!t) return;
  const copy = { ...t };
  try {
    await api('DELETE', `/api/tasks/${id}`);
    state.tasks = state.tasks.filter(x => x.id !== id);
    renderAll();
    toast(`Slettet "${copy.title.slice(0, 30)}"`, {
      ttl: 7000,
      action: { label: 'Angre', fn: async () => {
        try {
          const { task } = await api('POST', '/api/tasks', copy);
          upsertTask(task);
          renderAll();
          toast('Gjenopprettet');
        } catch (e) { toast('Kunne ikke gjenopprette: ' + e.message, { kind: 'err' }); }
      } },
    });
  } catch (e) { toast('Feil: ' + e.message, { kind: 'err' }); }
};

// 409-håndtering: ta inn serverens versjon og be brukeren prøve igjen.
function handleSaveError(e, id) {
  if (e.status === 409 && e.data && e.data.task) {
    upsertTask(e.data.task);
    renderAll();
    const by = e.data.task.updatedBy || 'noen andre';
    if (state.editingId === id) {
      state.editingBaseV = e.data.task.v;
      updateModalWarning(by, true);
    } else {
      toast(`Endret av ${by} i mellomtiden — visningen er oppdatert, prøv igjen`, { kind: 'warn', ttl: 6000 });
    }
  } else {
    toast('Feil: ' + e.message, { kind: 'err' });
  }
}

// ---------- Modal ----------
window.openEdit = function (id) {
  const t = findTask(id);
  if (!t) return;
  state.editingId = id;
  state.editingBaseV = t.v;
  $('modal-title').textContent = 'Rediger oppgave';
  $('f-title').value = t.title;
  $('f-desc').value = t.desc || '';
  $('f-cat').value = t.category;
  $('f-prio').value = t.priority;
  $('f-stat').value = t.status;
  $('f-est').value = t.estHours || '';
  $('f-owner-input').value = t.owner || '';
  $('f-owner-select').value = '';
  $('f-loc').value = t.location || '';
  $('f-dl').value = t.deadline || '';
  $('f-tags').value = (t.tags || []).join(', ');
  $('modal-delete').style.display = 'inline-flex';
  $('comments-section').style.display = '';
  $('modal-audit').textContent = `opprettet ${relTime(t.created)} av ${t.createdBy} · sist endret ${relTime(t.updated)} av ${t.updatedBy}`;
  renderComments(t);
  updateModalWarning();
  $('modal').classList.add('open');
  sendWS({ type: 'editing', id, active: true });
};

function openNew(prefill = {}) {
  state.editingId = null;
  state.editingBaseV = null;
  $('modal-title').textContent = 'Ny oppgave';
  $('f-title').value = prefill.title || '';
  $('f-desc').value = '';
  $('f-cat').value = prefill.category || CATEGORIES[0].id;
  $('f-prio').value = prefill.priority || 'P2';
  $('f-stat').value = 'todo';
  $('f-est').value = '';
  $('f-owner-input').value = state.user !== 'anon' ? state.user : '';
  $('f-owner-select').value = '';
  $('f-loc').value = '';
  $('f-dl').value = '';
  $('f-tags').value = '';
  $('modal-delete').style.display = 'none';
  $('comments-section').style.display = 'none';
  $('modal-audit').textContent = '';
  updateModalWarning();
  $('modal').classList.add('open');
  setTimeout(() => $('f-title').focus(), 50);
}

function closeModal() {
  if (state.editingId) sendWS({ type: 'editing', id: state.editingId, active: false });
  $('modal').classList.remove('open');
  state.editingId = null;
  state.editingBaseV = null;
}

// Varsellinje i modal: andre redigerer / noen lagret nettopp / 409.
function updateModalWarning(savedBy = null, conflict = false) {
  const el = $('modal-warning');
  if (!$('modal').classList.contains('open')) { el.className = 'modal-warning'; return; }
  const msgs = [];
  if (state.editingId) {
    const others = (state.editingMap[state.editingId] || []).filter(u => u !== state.user);
    if (others.length) msgs.push(`✎ ${others.join(', ')} redigerer også denne oppgaven nå.`);
    if (conflict) msgs.push(`⚠ ${savedBy} lagret en nyere versjon. Sjekk feltene — lagrer du igjen, overskriver du.`);
    else if (savedBy) msgs.push(`⚠ ${savedBy} lagret nettopp endringer på denne oppgaven.`);
  }
  el.textContent = msgs.join(' ');
  el.className = 'modal-warning' + (msgs.length ? ' show' : '');
}

async function saveForm() {
  const title = $('f-title').value.trim();
  if (!title) { toast('Tittel er påkrevd', { kind: 'warn' }); return; }
  const data = {
    title,
    desc: $('f-desc').value.trim(),
    category: $('f-cat').value,
    priority: $('f-prio').value,
    status: $('f-stat').value,
    estHours: parseFloat($('f-est').value) || 0,
    owner: $('f-owner-input').value.trim(),
    location: $('f-loc').value.trim(),
    deadline: $('f-dl').value,
    tags: $('f-tags').value.split(',').map(s => s.trim()).filter(Boolean),
  };
  try {
    let task;
    if (state.editingId) {
      data.v = state.editingBaseV;
      ({ task } = await api('PUT', `/api/tasks/${state.editingId}`, data));
      toast('Lagret');
    } else {
      ({ task } = await api('POST', '/api/tasks', data));
      toast('Opprettet');
    }
    upsertTask(task);
    closeModal();
    renderAll();
  } catch (e) { handleSaveError(e, state.editingId); }
}

async function deleteFromModal() {
  if (!state.editingId) return;
  const id = state.editingId;
  closeModal();
  window.deleteTask(id);
}

// ---------- Kommentarer ----------
function renderComments(t) {
  const list = $('comments-list');
  $('comment-count').textContent = t.comments && t.comments.length ? `(${t.comments.length})` : '';
  if (!t.comments || !t.comments.length) {
    list.innerHTML = '<div class="no-comments">Ingen kommentarer ennå.</div>';
    return;
  }
  list.innerHTML = t.comments.map(c => `
    <div class="comment">
      <div class="comment-head">
        <span class="comment-by ${c.by === state.user ? 'me' : ''}">${escapeHtml(c.by)}</span>
        <span class="comment-at">${relTime(c.at)}</span>
      </div>
      <div class="comment-text">${escapeHtml(c.text)}</div>
      ${c.by === state.user ? `<button class="icon-btn del comment-del" onclick="deleteComment('${t.id}','${c.id}')" title="Slett kommentar">×</button>` : ''}
    </div>`).join('');
}

async function sendComment() {
  if (!state.editingId) return;
  const input = $('comment-input');
  const text = input.value.trim();
  if (!text) return;
  try {
    const { task } = await api('POST', `/api/tasks/${state.editingId}/comments`, { text });
    upsertTask(task);
    input.value = '';
    renderComments(task);
    renderAll();
  } catch (e) { toast('Feil: ' + e.message, { kind: 'err' }); }
}

window.deleteComment = async function (taskId, commentId) {
  try {
    const { task } = await api('DELETE', `/api/tasks/${taskId}/comments/${commentId}`);
    upsertTask(task);
    renderComments(task);
    renderAll();
  } catch (e) { toast('Feil: ' + e.message, { kind: 'err' }); }
};

// ---------- Navnevalg (cookie-auth) ----------
async function setName() {
  const name = prompt('Brukernavn (a-z, 0-9, . _ @ -):', state.user === 'anon' ? '' : state.user);
  if (!name) return;
  try {
    await api('POST', '/api/login', { name: name.trim() });
    location.reload();
  } catch (e) { toast(e.message, { kind: 'err' }); }
}

// ---------- Import / eksport / seed ----------
function exportJSON() {
  const blob = new Blob([JSON.stringify(state.tasks, null, 2)], { type: 'application/json' });
  const a = document.createElement('a');
  a.href = URL.createObjectURL(blob);
  a.download = `netops-todo-${todayISO()}.json`;
  a.click();
  URL.revokeObjectURL(a.href);
}

async function importJSON(file) {
  try {
    const data = JSON.parse(await file.text());
    if (!Array.isArray(data)) throw new Error('Forventet array');
    if (!confirm(`Importere ${data.length} oppgaver? Dette erstatter alt på serveren for alle brukere.`)) return;
    await api('POST', '/api/replace', data);
    toast('Importert');
  } catch (e) { toast('Kunne ikke importere: ' + e.message, { kind: 'err' }); }
}

async function seedSamples() {
  try {
    const { count } = await api('POST', '/api/seed');
    toast(`${count} eksempel-oppgaver lastet`);
  } catch (e) { toast('Feil: ' + e.message, { kind: 'err' }); }
}

// ---------- Bindings ----------
function bindUI() {
  // Visning
  $('view-board').addEventListener('click', () => { state.view = 'board'; savePrefs(); renderView(); });
  $('view-table').addEventListener('click', () => { state.view = 'table'; savePrefs(); renderView(); });

  // Filtre
  const f = state.filters;
  $('f-status').value = f.status; $('f-category').value = f.category;
  $('f-priority').value = f.priority; $('f-search').value = f.search;
  $('f-status').addEventListener('change', e => { f.status = e.target.value; savePrefs(); renderView(); });
  $('f-category').addEventListener('change', e => { f.category = e.target.value; savePrefs(); renderView(); });
  $('f-priority').addEventListener('change', e => { f.priority = e.target.value; savePrefs(); renderView(); });
  $('f-owner').addEventListener('change', e => { f.owner = e.target.value; savePrefs(); renderView(); });
  $('f-search').addEventListener('input', e => { f.search = e.target.value; savePrefs(); renderView(); });
  $('clearFilters').addEventListener('click', () => {
    state.filters = { status: 'open', category: 'all', priority: 'all', owner: 'all', search: '' };
    $('f-status').value = 'open'; $('f-category').value = 'all';
    $('f-priority').value = 'all'; $('f-owner').value = 'all'; $('f-search').value = '';
    savePrefs(); renderView();
  });

  // Quick add
  $('quickadd-input').addEventListener('input', renderQuickAddPreview);
  $('quickadd-input').addEventListener('keydown', e => { if (e.key === 'Enter') submitQuickAdd(); });
  $('quickadd-btn').addEventListener('click', submitQuickAdd);

  // Modal
  $('newTaskBtn').addEventListener('click', () => openNew());
  $('modal-close').addEventListener('click', closeModal);
  $('modal-cancel').addEventListener('click', closeModal);
  $('modal-save').addEventListener('click', saveForm);
  $('modal-delete').addEventListener('click', deleteFromModal);
  $('modal').addEventListener('click', e => { if (e.target.id === 'modal') closeModal(); });
  $('f-owner-select').addEventListener('change', e => {
    if (e.target.value) { $('f-owner-input').value = e.target.value; e.target.value = ''; }
  });
  $('comment-send').addEventListener('click', sendComment);
  $('comment-input').addEventListener('keydown', e => { if (e.key === 'Enter') sendComment(); });

  // Aktivitets-skuff
  $('activityBtn').addEventListener('click', () => $('drawer').classList.toggle('open'));
  $('drawer-close').addEventListener('click', () => $('drawer').classList.remove('open'));

  // Import / eksport / seed / navn
  $('exportBtn').addEventListener('click', exportJSON);
  $('importBtn').addEventListener('click', () => $('importFile').click());
  $('importFile').addEventListener('change', e => {
    if (e.target.files[0]) importJSON(e.target.files[0]);
    e.target.value = '';
  });
  $('seedBtn').addEventListener('click', seedSamples);
  $('setNameBtn').addEventListener('click', setName);
  $('user-chip').addEventListener('click', () => { if (state.canSetName) setName(); });

  // Sortering (tabell)
  document.querySelectorAll('thead th[data-sort]').forEach(th => {
    th.addEventListener('click', () => {
      const field = th.dataset.sort;
      if (state.sort.field === field) {
        state.sort.dir = state.sort.dir === 'asc' ? 'desc' : 'asc';
      } else {
        state.sort.field = field;
        state.sort.dir = field === 'priority' || field === 'deadline' ? 'asc' : 'desc';
      }
      savePrefs(); renderView();
    });
  });

  // Tastatursnarveier
  document.addEventListener('keydown', e => {
    const tag = e.target.tagName;
    const typing = tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT';
    if (e.key === 'Escape') { closeModal(); $('drawer').classList.remove('open'); return; }
    if (typing) return;
    if (e.key === 'n') { e.preventDefault(); openNew(); }
    if (e.key === '/') { e.preventDefault(); $('f-search').focus(); }
    if (e.key === 'v') {
      state.view = state.view === 'board' ? 'table' : 'board';
      savePrefs(); renderView();
    }
    if (e.key === 'a') $('drawer').classList.toggle('open');
  });

  // Hent ferskt når fanen blir synlig igjen (mobil/sove-PC)
  document.addEventListener('visibilitychange', () => {
    if (!document.hidden && !state.wsOk) refreshState();
  });
}

function populateCategorySelects() {
  const filterSel = $('f-category');
  const formSel = $('f-cat');
  CATEGORIES.forEach(c => {
    filterSel.insertAdjacentHTML('beforeend', `<option value="${c.id}">${c.name}</option>`);
    formSel.insertAdjacentHTML('beforeend', `<option value="${c.id}">${c.name}</option>`);
  });
}

// ---------- Init ----------
async function init() {
  loadPrefs();
  populateCategorySelects();
  bindUI();
  await refreshState();
  connectWS();
  // Oppdater relative tidsstempler i aktivitetsfeeden jevnlig
  setInterval(() => { if ($('drawer').classList.contains('open')) renderActivity(); }, 60000);
}

init();