import { rowHTML, setRows, safe, showToast } from './helpers.js';
import { api } from './api.js';

const liveSockets = new Map();
let slowTimer = null;
let fastTimer = null;
const activeSids = new Set();

function injectOnceCSS() {
  if (document.getElementById('vmadmin-live-css')) return;
  const style = document.createElement('style');
  style.id = 'vmadmin-live-css';
  style.textContent = `
  .pulse-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#22c55e;margin-left:.5rem;opacity:.25;animation:pulse-vm 1s ease-in-out 4}
  @keyframes pulse-vm {0%,100%{opacity:.25;transform:scale(1)}50%{opacity:1;transform:scale(1.25)}}
  `;
  document.head.appendChild(style);
}

function closeForSid(sid) {
  const entry = liveSockets.get(sid);
  if (!entry) return;
  try { entry.obs && entry.obs.close(); } catch {}
  liveSockets.delete(sid);
}

export function stopAllAdminWatches() {
  if (slowTimer) { clearInterval(slowTimer); slowTimer = null; }
  if (fastTimer) { clearInterval(fastTimer); fastTimer = null; }
  activeSids.clear();
  for (const sid of Array.from(liveSockets.keys())) closeForSid(sid);
}

function flashDot(cell) {
  if (!cell) return;
  const nameWrap = cell.querySelector('.vm-name-wrap') || (() => {
    const w = document.createElement('span'); w.className = 'vm-name-wrap';
    while (cell.firstChild) w.appendChild(cell.firstChild);
    cell.appendChild(w);
    return w;
  })();
  const dot = document.createElement('span');
  dot.className = 'pulse-dot';
  nameWrap.appendChild(dot);
  setTimeout(() => { try { dot.remove(); } catch {} }, 4200);
}

function rebuildTargetSelect(selectEl, currentNode, nodes) {
  if (!selectEl) return;
  const html = nodes.map(n =>
    `<option value="${n}" ${n === currentNode ? 'disabled selected' : ''}>${n}</option>`
  ).join('');
  selectEl.innerHTML = html;
  const idx = Array.from(selectEl.options).findIndex(o => !o.disabled);
  if (idx >= 0) selectEl.selectedIndex = idx;
}

export async function renderVMAdmin() {
  injectOnceCSS();
  stopAllAdminWatches();

  const data = await api.listAllVmct();
  const arr = Array.isArray(data.all) ? data.all : [];
  const availableNodes = Array.isArray(data.nodes) ? data.nodes : [];
  const tbody = document.querySelector('#vm-admin tbody');
  if (!arr.length) { setRows(tbody, [rowHTML(['Brak VM/CT'])]); return; }

  const rows = arr.map(x => {
    const sid = safe(x.sid), type = safe(x.type), name = safe(x.name), node = safe(x.node);
    const nameCell = `<span class="vm-name-wrap">${name}</span>`;
    const actions = `
      <div class="btn-group btn-group-sm" role="group">
        <button class="btn btn-outline-secondary act-unlock">Unlock</button>
        <button class="btn btn-outline-success act-start">Start</button>
        <button class="btn btn-outline-warning act-shutdown">Shutdown</button>
        <button class="btn btn-outline-danger act-stop">Stop</button>
      </div>`;
    const sel = `<select class="form-select form-select-sm target-node" style="min-width:160px">
      ${availableNodes.map(n => `<option value="${n}" ${n === x.node ? 'disabled selected' : ''}>${n}</option>`).join('')}
    </select>`;
    const tools = `<div class="d-flex align-items-center gap-2">
      <button class="btn btn-outline-primary btn-sm act-migrate">Migrate (offline)</button>
      <button class="btn btn-outline-secondary btn-sm act-status">Details</button>
    </div>`;
    // Kolumny: SID | TYPE | NAME | NODE | ACTIONS | TARGET | TOOLS
    return rowHTML([sid, type.toUpperCase(), nameCell, node, actions, sel, tools], `data-sid="${sid}"`);
  });

  setRows(tbody, rows);

  Array.from(tbody.querySelectorAll('tr[data-sid]')).forEach(tr => {
    const sid = tr.getAttribute('data-sid');
    const nodeCell  = tr.children[3];
    const nameCell  = tr.children[2];
    const targetSel = tr.querySelector('.target-node');

    const ensureWatchOn = () => {
      const existing = liveSockets.get(sid);
      if (existing && existing.obs && existing.obs.readyState <= 1) return;

      closeForSid(sid);
      const wsObs = new WebSocket(api.wsObserveURL(sid));
      liveSockets.set(sid, { obs: wsObs });

      wsObs.onmessage = (ev) => {
        try {
          const msg = JSON.parse(ev.data);

          if (msg.type === 'task-start') {
            activeSids.add(sid);
            flashDot(nameCell);
          }
          else if (msg.type === 'task') {
            activeSids.add(sid);
            flashDot(nameCell);
          }
          else if (msg.type === 'moved' && msg.new_node) {
            if (nodeCell && nodeCell.textContent.trim() !== msg.new_node) {
              nodeCell.textContent = msg.new_node;
              rebuildTargetSelect(targetSel, msg.new_node, window.__nodesCache || []);
              flashDot(nameCell);
            }
            activeSids.add(sid);
          }
          else if (msg.type === 'done') {
            setTimeout(() => activeSids.delete(sid), 4000);
            flashDot(nameCell);
          }
        } catch {}
      };

      wsObs.onclose = () => {
        const e = liveSockets.get(sid);
        if (e && e.obs === wsObs) liveSockets.set(sid, { obs: null });
      };
    };

    const doAction = async (action, withTarget=false) => {
      try {
        ensureWatchOn();
        if (action !== 'unlock') activeSids.add(sid);
        const target = withTarget ? (targetSel?.value || '') : undefined;
        const resp = await api.vmAction(sid, action, target);
        if (!resp.ok) throw new Error(resp.error || 'unknown');
        flashDot(nameCell);
      } catch (e) {
        showToast('Error', 'ERROR: ' + (e.message || e), 'danger');
        activeSids.delete(sid);
      }
    };

    tr.querySelector('.act-unlock')?.addEventListener('click', () => doAction('unlock'));
    tr.querySelector('.act-start')?.addEventListener('click',   () => doAction('start'));
    tr.querySelector('.act-stop')?.addEventListener('click',    () => doAction('stop'));
    tr.querySelector('.act-shutdown')?.addEventListener('click',() => doAction('shutdown'));
    tr.querySelector('.act-migrate')?.addEventListener('click', () => doAction('migrate', true));

    tr.querySelector('.act-status')?.addEventListener('click', async () => {
      flashDot(nameCell);
    });

    ensureWatchOn();
  });

  window.__nodesCache = availableNodes.slice();

  // pełna lista – co 30 s
  slowTimer = setInterval(async () => {
    try {
      const latest = await api.listAllVmct();
      const all = Array.isArray(latest.all) ? latest.all : [];
      const bySid = new Map(all.map(x => [String(x.sid), x]));
      const nodesNow = Array.isArray(latest.nodes) ? latest.nodes : window.__nodesCache || [];
      window.__nodesCache = nodesNow;

      Array.from(tbody.querySelectorAll('tr[data-sid]')).forEach(tr => {
        const sid = tr.getAttribute('data-sid');
        const rowData = bySid.get(sid);
        if (!rowData) return;

        const nodeCell  = tr.children[3];
        const nameCell  = tr.children[2];
        const targetSel = tr.querySelector('.target-node');

        const newNode = String(rowData.node || '').trim();
        if (nodeCell && newNode && nodeCell.textContent.trim() !== newNode) {
          nodeCell.textContent = newNode;
          rebuildTargetSelect(targetSel, newNode, nodesNow);
          flashDot(nameCell);
        }
      });
    } catch {}
  }, 30000);

  // tylko aktywne – co 10 s
  fastTimer = setInterval(async () => {
    try {
      const sids = Array.from(activeSids);
      if (!sids.length) return;
      for (const sid of sids) {
        const detail = await api.vmDetail(sid);
        if (!detail || !detail.meta) continue;
        const tr = tbody.querySelector(`tr[data-sid="${sid}"]`);
        if (!tr) continue;
        const nodeCell  = tr.children[3];
        const nameCell  = tr.children[2];
        const targetSel = tr.querySelector('.target-node');

        const newNode = String(detail.node || (detail.meta && detail.meta.node) || '').trim();
        if (newNode) {
          if (nodeCell && nodeCell.textContent.trim() !== newNode) {
            nodeCell.textContent = newNode;
            flashDot(nameCell);
          }
          rebuildTargetSelect(targetSel, newNode, window.__nodesCache || []);
        }
        setTimeout(() => activeSids.delete(sid), 4000);
      }
    } catch {}
  }, 10000);

  window.addEventListener('beforeunload', stopAllAdminWatches, { once: true });
}