import { rowHTML, setRows, safe, showToast, badge } 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 flashDot(cell) {
  if (!cell) return;
  const dot = document.createElement('span');
  dot.className = 'pulse-dot';
  cell.appendChild(dot);
  setTimeout(() => dot.remove(), 1500);
}

function setBadgeCell(cell, textOrState) {
  if (!cell) return;
  let html = '';
  const s = String(textOrState || '').toLowerCase();
  if (/running|online|started/.test(s)) html = badge('running','ok');
  else if (/stopp|shutdown|offline/.test(s)) html = badge('stopped','dark');
  else if (/working|progress|busy/.test(s)) html = badge('working','info');
  else html = badge(textOrState || '—','dark');
  if (cell.innerHTML !== html) {
    cell.innerHTML = html;
    return true; // changed
  }
  return false;
}

function rebuildTargetSelect(selectEl, currentNode, nodes) {
  if (!selectEl) return [];
  const others = (nodes || [])
    .map(n => String(n).trim())
    .filter(Boolean)
    .filter(n => n !== String(currentNode || '').trim());
  selectEl.innerHTML = others.map(n => `<option value="${n}">${n}</option>`).join('');
  if (selectEl.options.length > 0) {
    selectEl.selectedIndex = 0;
  }
  return others; // return list to decide enable/disable of MIGRATE
}

function updateMigrateButton(tr, isRunning) {
  const btn = tr?.querySelector('.act-migrate');
  const targetSel = tr?.querySelector('.target-node');
  if (!btn) return;
  const hasTarget = targetSel && targetSel.options && targetSel.options.length > 0;
  const enable = isRunning && hasTarget;
  if (enable) {
    btn.removeAttribute('disabled');
    btn.classList.remove('disabled');
  } else {
    btn.setAttribute('disabled', '');
    btn.classList.add('disabled');
  }
}

function updateActionButtons(tr, isRunning) {
  const bStart = tr?.querySelector('.act-start');
  const bStop = tr?.querySelector('.act-stop');
  const bShutdown = tr?.querySelector('.act-shutdown');
  if (bStart) {
    if (isRunning) { bStart.setAttribute('disabled',''); bStart.classList.add('disabled'); }
    else { bStart.removeAttribute('disabled'); bStart.classList.remove('disabled'); }
  }
  if (bStop) {
    if (isRunning) { bStop.removeAttribute('disabled'); bStop.classList.remove('disabled'); }
    else { bStop.setAttribute('disabled',''); bStop.classList.add('disabled'); }
  }
  if (bShutdown) {
    if (isRunning) { bShutdown.removeAttribute('disabled'); bShutdown.classList.remove('disabled'); }
    else { bShutdown.setAttribute('disabled',''); bShutdown.classList.add('disabled'); }
  }
}

    ? Array.from(new Set(ns.nodes.map(n => String(n.name || n.node || n).trim()).filter(Boolean)))
    : (Array.isArray(ns) ? Array.from(new Set(ns.map(n => String(n.name || n.node || n).trim()).filter(Boolean))) : []);
  setRows(tbody, []);

  // initial table fill
  try {
    const latest = await api.listAllVmct();
    const all = Array.isArray(latest.all) ? latest.all : [];
    const nodesNow = Array.isArray(latest.nodes) ? latest.nodes : [];
    window.__nodesCache = nodesNow.slice();

    const rows = all.map(vm => ({
      sid: safe(vm.sid),
      name: safe(vm.name || vm.vmid || vm.sid),
      node: safe(vm.node || '—'),
      status: safe(vm.status || '—')
    }));

    const htmlRows = rows.map(r => rowHTML([
      `<input type=\"checkbox\" class=\"row-check\">`,
      safe(r.sid),
      safe(r.name),
      safe(r.node),
      badge(safe(r.status), /running|online|started/i.test(r.status) ? 'ok' : 'dark'),
      `<div class=\"btn-group\">
         <button class=\"btn btn-sm btn-success act-start\">Start</button>
         <button class=\"btn btn-sm btn-outline-secondary act-shutdown\">Shutdown</button>
         <button class=\"btn btn-sm btn-outline-danger act-stop\">Stop</button>
         <button class=\"btn btn-sm btn-warning act-unlock\">Unlock</button>
       </div>`,
      `<select class=\"form-select form-select-sm target-node\"></select>`,
      `<button class=\"btn btn-sm btn-primary w-100 act-migrate\" disabled>MIGRATE</button>`
    ]));

    setRows(tbody, htmlRows);

    // wire node selects and actions
    Array.from(tbody.querySelectorAll('tr[data-sid]')).forEach(tr => {
      const nodeCell  = tr.children[3];
      const targetSel = tr.querySelector('.target-node');
      const _others = rebuildTargetSelect(targetSel, nodeCell?.textContent.trim(), availableNodes);
      updateMigrateButton(tr, /running|online|started/i.test(tr.children[4].innerText));

      const sid = tr.getAttribute('data-sid');
      const nameCell = tr.children[2];

      async function doAction(kind, needsTarget) {
        try {
          const targetNode = needsTarget ? targetSel?.value : undefined;
          activeSids.add(sid);
          setBadgeCell(tr.children[4], 'working');
          updateMigrateButton(tr, false);
          const res = await api.vmAction(sid, kind, targetNode);
          if (res?.ok) {
            showToast(`Task ${kind} started for ${safe(nameCell.textContent)}`);
          } else {
            showToast(`Task ${kind} failed for ${safe(nameCell.textContent)}`, 'danger');
          }
        } catch (e) {
          showToast(`Error: ${e?.message || e}`, 'danger');
        }
      }

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

      ensureWatchOn();
    });

    window.__nodesCache = availableNodes.slice();

    // full refresh – every 30s
    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 statusCell= tr.children[4];
          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;
            const _others = rebuildTargetSelect(targetSel, newNode, nodesNow);
            updateMigrateButton(tr, /running|online|started/i.test(tr.children[4].innerText));
            flashDot(nameCell);
          }

          // status from slow reconcile — only when not 'working' to avoid overruling WS
          const currentTxt = (statusCell?.innerText || '').toLowerCase();
          if (!/working/.test(currentTxt)) {
            const stRaw = String(rowData.status || '').toLowerCase(); // fallback z /cluster/resources
            if (stRaw) {
              const changed = setBadgeCell(statusCell, stRaw);
              const isRunning = /running|online|started/.test(stRaw);
              updateMigrateButton(tr, isRunning);
              updateActionButtons(tr, isRunning);
            updateActionButtons(tr, isRunning);
              if (changed) flashDot(nameCell);
            }
          }
        });
      } catch {}
    }, 30000);

    // active only – every 10s (pull precise status + node)
    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 statusCell= tr.children[4];
          const nameCell  = tr.children[2];
          const targetSel = tr.querySelector('.target-node');

          const stRaw = String((detail.current && (detail.current.status || detail.current.qmpstatus)) || '').toLowerCase();
          const changed = setBadgeCell(statusCell, stRaw);
              const isRunning = /running|online|started/.test(stRaw);
              updateMigrateButton(tr, isRunning);
              updateActionButtons(tr, isRunning);
            updateActionButtons(tr, isRunning);
          if (changed) flashDot(nameCell);

          const newNode = String(detail.node || (detail.meta && detail.meta.node) || '').trim();
          if (newNode) {
            if (nodeCell && nodeCell.textContent.trim() !== newNode) {
              nodeCell.textContent = newNode;
              rebuildTargetSelect(targetSel, newNode, window.__nodesCache || []);
              flashDot(nameCell);
            }
          }

          if (stRaw && /running|stopped|shutdown/.test(stRaw)) {
            setTimeout(() => activeSids.delete(sid), 4000);
          }
        }
      } catch {}
    }, 10000);

    window.addEventListener('beforeunload', stopAllAdminWatches, { once: true });
  } catch (e) {
    showToast(`Failed to load list: ${e?.message || e}`, 'danger');
  }
}

// Entry point expected by main.js
export async function renderVMAdmin() {
  try {
    await startAdminWatches();
  } catch (e) {
    showToast(`VM Admin initialization error: ${e?.message || e}`, 'danger');
    console.error(e);
  }
}