// static/js/ui-channels.js – Kanal-Rendering & Listener

// Gemeinsame Helper-Funktion zum Senden von Steuerbefehlen
async function sendControl(port, value) {
  try {
    const res = await fetch('/api/control', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ port, value })
    });

    const data = await res.json();
    if (!data.success) {
      throw new Error(data.message || 'Unbekannter Fehler');
    }
  } catch (err) {
    console.error(`sendControl(${port}, ${value}) fehlgeschlagen:`, err);
    alert(`Steuerbefehl fehlgeschlagen: ${err.message}`);
    updateStatus(false, 'Steuerfehler');
  }
}

function renderChannels() {
  console.log("renderChannels() START");
  console.log("→ config.channels existiert?", !!config?.channels);
  console.log("→ channels.length:", config?.channels?.length ?? "undefined");

  const container = document.getElementById('channels-container');
  if (!container) {
    console.error("channelsContainer nicht gefunden!");
    return;
  }

  container.innerHTML = '';

  if (!config?.channels || config.channels.length === 0) {
    container.innerHTML = '<p class="text-center text-muted py-5">Keine Kanäle definiert.</p>';
    return;
  }

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

    let html = '';

    if (channel.type === 'motor') {
      html = `
        <label class="form-label fw-bold">${channel.name} (${channel.port})</label>
        <input type="range" class="form-range motor-slider" min="-100" max="100" value="0" step="5" data-port="${channel.port}">
        <div class="d-flex justify-content-between mt-1 small">
          <span>-100 %</span>
          <span class="value-display fw-bold">0 %</span>
          <span>+100 %</span>
        </div>
        <div class="text-center mt-2">
          <button class="btn btn-sm btn-outline-danger stop-channel-btn" data-port="${channel.port}">
            <i class="bi bi-stop-fill me-1"></i> Stop
          </button>
        </div>
      `;
    } else {
      html = `
        <label class="form-label fw-bold">${channel.name} (${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 shadow-sm"><div class="card-body">${html}</div></div>`;
    container.appendChild(col);
  });

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

  document.querySelectorAll('.stop-channel-btn').forEach(btn => {
    btn.addEventListener('click', async () => {
      await sendControl(btn.dataset.port, 0);
      const slider = document.querySelector(`input[data-port="${btn.dataset.port}"]`);
      if (slider) {
        slider.value = 0;
        const display = slider.parentElement.querySelector('.value-display');
        if (display) display.textContent = '0 %';
      }
    });
  });

  document.querySelectorAll('.toggle-btn').forEach(btn => {
    btn.addEventListener('click', async () => {
      const state = btn.dataset.state === 'off' ? 'on' : 'off';
      btn.dataset.state = state;
      btn.textContent = state === 'on' ? 'EIN' : 'AUS';
      btn.classList.toggle('btn-success', state === 'on');
      btn.classList.toggle('btn-outline-secondary', state === 'off');
      await sendControl(btn.dataset.port, state === 'on' ? 1 : 0);
    });
  });
}

// Am Ende von ui-channels.js
window.initChannels = renderChannels;