(() => {
  const grid = document.getElementById('grid');
  const searchInput = document.getElementById('search');
  const statsEl = document.getElementById('stats');
  const screenshotAllBtn = document.getElementById('screenshot-all');
  const logsModal = document.getElementById('logs-modal');
  const logsTitle = document.getElementById('logs-title');
  const logsBody = document.getElementById('logs-body');
  const logsClose = document.getElementById('logs-close');

  let projects = [];
  let filter = 'all';
  let searchTerm = '';

  // -- Helpers --

  function slugColor(slug) {
    let hash = 0;
    for (let i = 0; i < slug.length; i++) hash = slug.charCodeAt(i) + ((hash << 5) - hash);
    return `hsl(${Math.abs(hash) % 360}, 45%, 25%)`;
  }

  function projectHash(p) {
    return `${p.status || 'stopped'}|${p.apiStatus || 'stopped'}|${p.frontendStatus || ''}|${p._hasScreenshot ? 1 : 0}|${p._screenshotTs || 0}|${p.hasDocs ? 1 : 0}`;
  }

  function shouldShow(p) {
    const status = p.status || 'stopped';
    if (filter === 'running' && status !== 'running') return false;
    if (filter === 'stopped' && status !== 'stopped') return false;
    if (searchTerm && !p.name.toLowerCase().includes(searchTerm) && !p.slug.toLowerCase().includes(searchTerm)) return false;
    return true;
  }

  // -- Card rendering --

  function cardHTML(p) {
    const status = p.status || 'stopped';
    const isRunning = status === 'running';
    const isBusy = status === 'starting' || status === 'stopping';
    const screenshotSrc = `/screenshots/${p.slug}.png?t=${p._screenshotTs || 0}`;
    const hasFrontend = !!p.frontend;

    const imgInner = p._hasScreenshot
      ? `<img class="card-img" src="${screenshotSrc}" alt="${p.name}" loading="lazy">`
      : `<div class="card-placeholder" style="background:${slugColor(p.slug)}">${p.name[0]}</div>`;

    const imgHtml = `<div class="card-visual">
        ${imgInner}
        <button class="btn-screenshot-icon" onclick="actions.screenshot('${p.slug}')" ${!isRunning ? 'disabled' : ''} title="Take screenshot">📷</button>
      </div>`;

    // Status dots: show API + Frontend for frontend projects
    let statusDots;
    if (hasFrontend) {
      const apiSt = p.apiStatus || 'stopped';
      const feSt = p.frontendStatus || 'stopped';
      statusDots = `<div class="status-dots">
        <div class="status-dot ${apiSt}" title="API: ${apiSt}"></div>
        <div class="status-dot ${feSt}" title="Frontend: ${feSt}"></div>
      </div>`;
    } else {
      statusDots = `<div class="status-dot ${status}"></div>`;
    }

    // Open link: frontend port for frontend projects, API port otherwise
    const openPort = hasFrontend ? p.frontend.port : p.port;

    // DB badge with relative path
    const dbBadge = p.dbType ? `<span class="badge db">${p.dbType}${p.dbName ? ` (${p.dbName})` : ''}</span>` : '';

    return `
        ${imgHtml}
        <div class="card-body">
          <div class="card-header">
            ${statusDots}
            <div class="card-name" title="${p.slug}">${p.name}</div>
          </div>
          <div class="badges-wrap">
            <div class="badges">
              <span class="badge">:${p.port}</span>
              ${dbBadge}
              ${!p.hasEnv ? '<span class="badge" style="color:var(--red)">no .env</span>' : ''}
            </div>
            ${hasFrontend ? `<div class="badges">
              <span class="badge fe">:${p.frontend.port}</span>
              <span class="badge fe">${p.frontend.dir}</span>
            </div>` : ''}
          </div>
          <div class="card-path" title="${p.path}">${p.path}</div>
          <div class="card-actions">
            ${isRunning
              ? `<button class="btn-stop" onclick="actions.stop('${p.slug}')" ${isBusy ? 'disabled' : ''}>Stop</button>`
              : `<button class="btn-start" onclick="actions.start('${p.slug}')" ${isBusy ? 'disabled' : ''}>Start</button>`
            }
            ${p.hasDocs ? `<a class="btn-docs" href="/docs/${p.slug}/" target="_blank">Docs</a>` : ''}
            ${isRunning
              ? `<a class="btn-open" href="http://${location.hostname}:${openPort}" target="_blank">Open</a>`
              : `<button class="btn-open" onclick="actions.logs('${p.slug}')">Logs</button>`
            }
          </div>
        </div>`;
  }

  // -- Smart DOM update --

  const cardHashes = new Map();

  function render() {
    const running = projects.filter(p => p.status === 'running').length;
    statsEl.textContent = `(${projects.length} projects, ${running} running)`;

    const visible = projects.filter(shouldShow);
    const visibleSlugs = new Set(visible.map(p => p.slug));

    // Remove cards no longer visible
    for (const card of [...grid.children]) {
      if (!visibleSlugs.has(card.dataset.slug)) {
        card.remove();
        cardHashes.delete(card.dataset.slug);
      }
    }

    // Add or update visible cards in order
    let prevCard = null;
    for (const p of visible) {
      const hash = projectHash(p);
      let card = grid.querySelector(`[data-slug="${p.slug}"]`);

      if (!card) {
        // New card
        card = document.createElement('div');
        card.className = 'card';
        card.dataset.slug = p.slug;
        card.innerHTML = cardHTML(p);
        cardHashes.set(p.slug, hash);

        if (prevCard && prevCard.nextSibling) {
          grid.insertBefore(card, prevCard.nextSibling);
        } else if (prevCard) {
          grid.appendChild(card);
        } else if (grid.firstChild) {
          grid.insertBefore(card, grid.firstChild);
        } else {
          grid.appendChild(card);
        }
      } else if (cardHashes.get(p.slug) !== hash) {
        // Changed - update innerHTML only for this card
        card.innerHTML = cardHTML(p);
        cardHashes.set(p.slug, hash);
      }

      prevCard = card;
    }
  }

  // -- Data fetching --

  async function fetchProjects() {
    try {
      const res = await fetch('/api/projects');
      const data = await res.json();

      // Probe screenshots for new projects
      const checks = data.map(async (p) => {
        const old = projects.find(o => o.slug === p.slug);
        if (old) {
          p._hasScreenshot = old._hasScreenshot;
          p._screenshotTs = old._screenshotTs || 0;
        } else {
          p._hasScreenshot = await imageExists(`/screenshots/${p.slug}.png`);
          p._screenshotTs = p._hasScreenshot ? Date.now() : 0;
        }
      });
      await Promise.all(checks);

      projects = data;
      render();
    } catch (err) {
      console.error('Failed to fetch projects:', err);
    }
  }

  function imageExists(url) {
    return new Promise(resolve => {
      const img = new Image();
      img.onload = () => resolve(true);
      img.onerror = () => resolve(false);
      img.src = url;
    });
  }

  // -- Centrifugo real-time updates --

  async function connectCentrifugo() {
    try {
      const res = await fetch('/api/centrifugo/token');
      const { token } = await res.json();

      const client = new Centrifuge(`ws://${location.hostname}:8787/connection/websocket`, {
        token,
      });

      const sub = client.newSubscription('projects-browser');

      sub.on('publication', (ctx) => {
        const msg = ctx.data;

        if (msg.type === 'status') {
          const p = projects.find(p => p.slug === msg.slug);
          if (p) {
            if (msg.subtype === 'api') {
              p.apiStatus = msg.status;
            } else if (msg.subtype === 'frontend') {
              p.frontendStatus = msg.status;
            }
            // Recompute combined status
            const hasFe = !!p.frontend;
            if (!hasFe) {
              p.status = p.apiStatus || msg.status;
            } else {
              const apiSt = p.apiStatus || 'stopped';
              const feSt = p.frontendStatus || 'stopped';
              if (apiSt === 'running' && feSt === 'running') p.status = 'running';
              else if (apiSt === 'error' || feSt === 'error') p.status = 'error';
              else if (apiSt === 'starting' || feSt === 'starting') p.status = 'starting';
              else if (apiSt === 'stopping' || feSt === 'stopping') p.status = 'stopping';
              else p.status = 'stopped';
            }
            render();
          }
        }

        if (msg.type === 'screenshot') {
          const p = projects.find(p => p.slug === msg.slug);
          if (p) {
            p._hasScreenshot = true;
            p._screenshotTs = Date.now();
            render();
          }
        }
      });

      sub.subscribe();

      client.on('connected', () => {
        console.log('Centrifugo connected');
      });

      client.on('disconnected', (ctx) => {
        console.log('Centrifugo disconnected:', ctx.reason);
      });

      client.connect();
    } catch (err) {
      console.error('Centrifugo setup failed, falling back to polling:', err);
      setInterval(fetchProjects, 5000);
    }
  }

  // -- Actions --

  window.actions = {
    async start(slug) {
      await fetch(`/api/projects/${slug}/start`, { method: 'POST' });
      // Status updates come via Centrifugo
    },

    async stop(slug) {
      await fetch(`/api/projects/${slug}/stop`, { method: 'POST' });
    },

    async screenshot(slug) {
      const btn = grid.querySelector(`[data-slug="${slug}"] .btn-screenshot-icon`);
      if (btn) { btn.disabled = true; btn.textContent = '⏳'; }

      try {
        await fetch(`/api/projects/${slug}/screenshot`, { method: 'POST' });
        // Screenshot update comes via Centrifugo
      } catch (err) {
        console.error('Screenshot failed:', err);
      }
    },

    async logs(slug) {
      const res = await fetch(`/api/projects/${slug}/logs`);
      const data = await res.json();
      logsTitle.textContent = `Logs: ${slug}`;
      // Show both API and frontend logs
      let text = '';
      if (data.api?.length) {
        text += '--- API ---\n' + data.api.join('\n');
      }
      if (data.frontend?.length) {
        if (text) text += '\n\n';
        text += '--- Frontend ---\n' + data.frontend.join('\n');
      }
      logsBody.textContent = text || '(no logs)';
      logsModal.classList.add('open');
    }
  };

  // -- Filter buttons --

  document.querySelectorAll('.filter-btn').forEach(btn => {
    btn.addEventListener('click', () => {
      document.querySelectorAll('.filter-btn').forEach(b => b.classList.remove('active'));
      btn.classList.add('active');
      filter = btn.dataset.filter;
      render();
    });
  });

  // Search
  searchInput.addEventListener('input', () => {
    searchTerm = searchInput.value.toLowerCase().trim();
    render();
  });

  // Screenshot all
  screenshotAllBtn.addEventListener('click', async () => {
    screenshotAllBtn.disabled = true;
    screenshotAllBtn.textContent = 'Taking screenshots...';
    try {
      await fetch('/api/screenshot-all', { method: 'POST' });
      // Updates come via Centrifugo
    } finally {
      screenshotAllBtn.disabled = false;
      screenshotAllBtn.textContent = 'Screenshot All';
    }
  });

  // Logs modal close
  logsClose.addEventListener('click', () => logsModal.classList.remove('open'));
  logsModal.addEventListener('click', (e) => {
    if (e.target === logsModal) logsModal.classList.remove('open');
  });

  // -- Init --
  fetchProjects().then(connectCentrifugo);
})();
