// app.js – gemeinsames JavaScript
console.log("MK Control JS geladen");

document.addEventListener('DOMContentLoaded', () => {
  console.log('MK Control Frontend geladen');

  const connectBtn = document.getElementById('connect-btn');
  const connectSection = document.getElementById('connect-section');
  const controlSection = document.getElementById('control-section');
  const channelsContainer = document.getElementById('channels-container');
  const stopAllBtn = document.getElementById('stop-all-btn');

  if (!connectBtn) return; // Sicherstellen, dass wir auf der richtigen Seite sind

  connectBtn.addEventListener('click', async () => {
    connectBtn.disabled = true;
    connectBtn.innerHTML = '<span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span> Verbinde...';

    try {
      const response = await fetch('/api/connect', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' }
      });

      const result = await response.json();

      if (result.success) {
        connectSection.style.display = 'none';
        controlSection.style.display = 'block';
        renderChannels();
        alert('Verbunden! (Simulation)');
      } else {
        alert('Verbindung fehlgeschlagen: ' + (result.message || 'Unbekannter Fehler'));
      }
    } catch (err) {
      console.error(err);
      alert('Fehler bei der Verbindung: ' + err.message);
    } finally {
      connectBtn.disabled = false;
      connectBtn.innerHTML = '<i class="bi bi-bluetooth me-2"></i> Mit Hub verbinden';
    }
  });

  stopAllBtn.addEventListener('click', async () => {
    if (!confirm('Wirklich alle Kanäle stoppen?')) return;

    try {
      const res = await fetch('/api/stop_all', { method: 'POST' });
      const data = await res.json();
      if (data.success) {
        alert('Alle Kanäle gestoppt');
      }
    } catch (err) {
      alert('Fehler beim Stoppen');
    }
  });

  function renderChannels() {
    channelsContainer.innerHTML = '';

    if (!config.channels || config.channels.length === 0) {
      channelsContainer.innerHTML = '<p class="text-center text-muted py-4">Keine Kanäle in der Konfiguration definiert.</p>';
      return;
    }

    config.channels.forEach(channel => {
      const col = document.createElement('div');
      col.className = 'col-md-6 mb-4';

      let controlHTML = '';

      if (channel.type === 'motor') {
        controlHTML = `
          <label class="form-label">${channel.name} (${channel.port})</label>
          <input type="range" class="form-range motor-slider" 
                 min="-100" max="100" value="0" step="5"
                 data-port="${channel.port}">
          <div class="text-center mt-1">
            <span class="value-display">0 %</span>
          </div>
        `;
      } else {
        // Licht, Sound, Fogger → Toggle-Button
        controlHTML = `
          <label class="form-label">${channel.name} (${channel.port})</label>
          <button class="btn btn-outline-secondary w-100 toggle-btn" 
                  data-port="${channel.port}" data-state="off">
            AUS
          </button>
        `;
      }

      col.innerHTML = `
        <div class="card h-100">
          <div class="card-body">
            ${controlHTML}
          </div>
        </div>
      `;

      channelsContainer.appendChild(col);
    });

    // Event-Listener für Slider
    document.querySelectorAll('.motor-slider').forEach(slider => {
      const display = slider.parentElement.querySelector('.value-display');
      slider.addEventListener('input', async () => {
        const value = parseInt(slider.value) / 100;
        display.textContent = `${slider.value} %`;
        await sendControl(slider.dataset.port, value);
      });
    });

    // Event-Listener für Toggle-Buttons
    document.querySelectorAll('.toggle-btn').forEach(btn => {
      btn.addEventListener('click', async () => {
        const current = btn.dataset.state;
        const newState = current === 'off' ? 'on' : 'off';
        btn.dataset.state = newState;
        btn.textContent = newState === 'on' ? 'EIN' : 'AUS';
        btn.classList.toggle('btn-success', newState === 'on');
        btn.classList.toggle('btn-outline-secondary', newState === 'off');

        await sendControl(btn.dataset.port, newState === 'on' ? 1 : 0);
      });
    });
  }

  async function sendControl(port, value) {
    try {
      const res = await fetch('/api/control', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ port, value })
      });
      // Kann später Feedback geben
    } catch (err) {
      console.error('Steuerbefehl fehlgeschlagen:', err);
    }
  }
});