// Disk Monitoring - Admin UI
// CSP-compliant implementation using DOM manipulation

async function loadMetrics() {
  const loading = document.getElementById('loading');
  const metricsContainer = document.getElementById('metrics-container');
  const errorDiv = document.getElementById('error');

  try {
    loading.classList.remove('hidden');
    metricsContainer.classList.add('hidden');
    errorDiv.classList.add('hidden');

    const token = localStorage.getItem('admin_token');
    if (!token) {
      throw new Error('Not authenticated. Please log in.');
    }

    const response = await fetch('/api/admin/disk-metrics', {
      headers: { 'Authorization': 'Bearer ' + token }
    });

    if (!response.ok) {
      throw new Error('Failed to fetch metrics: ' + response.status);
    }

    const result = await response.json();

    if (!result.success) {
      throw new Error(result.error || 'Unknown error');
    }

    renderMetrics(result.data);

    loading.classList.add('hidden');
    metricsContainer.classList.remove('hidden');

  } catch (err) {
    console.error('Load metrics error:', err);
    loading.classList.add('hidden');
    errorDiv.classList.remove('hidden');

    const errorMessage = document.getElementById('error-message');
    errorMessage.textContent = err.message || 'An unexpected error occurred';
  }
}

function renderMetrics(data) {
  const localContainer = document.getElementById('local-metrics');
  const remoteContainer = document.getElementById('remote-metrics');

  // Clear existing content
  localContainer.textContent = '';
  remoteContainer.textContent = '';

  // Render local metrics
  if (data.local) {
    renderSystemMetrics(localContainer, data.local, 'Local Development');
  } else {
    renderError(localContainer, 'Local metrics unavailable');
  }

  // Render remote metrics
  if (data.remote) {
    renderSystemMetrics(remoteContainer, data.remote, 'Production VPS');
  } else {
    renderError(remoteContainer, 'Remote metrics unavailable');
  }
}

function renderSystemMetrics(container, metrics, label) {
  // Disk Usage Card
  const diskCard = createMetricCard(
    'Disk Usage',
    metrics.health,
    [
      { label: 'Total', value: metrics.total },
      { label: 'Used', value: metrics.used },
      { label: 'Available', value: metrics.available },
      { label: 'Usage', value: metrics.usedPercent + '%', progress: metrics.usedPercent }
    ]
  );
  container.appendChild(diskCard);

  // Memory Card
  if (metrics.memory) {
    const memoryCard = createMetricCard(
      'Memory',
      { level: metrics.memory.usedPercent >= 90 ? 'critical' : metrics.memory.usedPercent >= 80 ? 'warning' : 'healthy' },
      [
        { label: 'Total', value: metrics.memory.total },
        { label: 'Used', value: metrics.memory.usedPercent + '%', progress: metrics.memory.usedPercent }
      ]
    );
    container.appendChild(memoryCard);
  }

  // System Info Card
  const sysCard = createMetricCard(
    'System Info',
    null,
    [
      { label: 'Hostname', value: metrics.hostname || 'Unknown' },
      { label: 'Platform', value: metrics.platform || 'Unknown' },
      { label: 'Uptime', value: (metrics.uptime || 0) + ' hours' }
    ]
  );
  container.appendChild(sysCard);

  // Docker Volumes (if present)
  if (metrics.docker) {
    const dockerCard = createMetricCard(
      'Docker Volumes',
      null,
      [
        { label: 'Total', value: metrics.docker.total },
        { label: 'Used', value: metrics.docker.used }
      ]
    );
    container.appendChild(dockerCard);
  }
}

function createMetricCard(title, health, items) {
  const card = document.createElement('div');
  card.className = 'metric-card bg-white rounded-lg shadow-lg p-6';

  // Card header
  const header = document.createElement('div');
  header.className = 'flex items-center justify-between mb-4';

  const titleEl = document.createElement('h3');
  titleEl.className = 'text-lg font-semibold text-gray-900';
  titleEl.textContent = title;
  header.appendChild(titleEl);

  // Health indicator (if present)
  if (health) {
    const indicator = document.createElement('span');
    indicator.className = 'health-indicator health-' + health.level;
    indicator.title = health.level.charAt(0).toUpperCase() + health.level.slice(1);
    header.appendChild(indicator);
  }

  card.appendChild(header);

  // Card content
  items.forEach(item => {
    const row = document.createElement('div');
    row.className = 'mb-3';

    const labelDiv = document.createElement('div');
    labelDiv.className = 'flex justify-between text-sm mb-1';

    const labelSpan = document.createElement('span');
    labelSpan.className = 'text-gray-600';
    labelSpan.textContent = item.label;
    labelDiv.appendChild(labelSpan);

    const valueSpan = document.createElement('span');
    valueSpan.className = 'font-semibold text-gray-900';
    valueSpan.textContent = item.value;
    labelDiv.appendChild(valueSpan);

    row.appendChild(labelDiv);

    // Progress bar (if present)
    if (item.progress !== undefined) {
      const progressBg = document.createElement('div');
      progressBg.className = 'w-full bg-gray-200 rounded-full h-2';

      const progressBar = document.createElement('div');
      progressBar.className = 'progress-bar h-2 rounded-full ' + getProgressColor(item.progress);
      progressBar.style.width = item.progress + '%';

      progressBg.appendChild(progressBar);
      row.appendChild(progressBg);
    }

    card.appendChild(row);
  });

  return card;
}

function renderError(container, message) {
  const errorDiv = document.createElement('div');
  errorDiv.className = 'col-span-3 bg-yellow-50 border-l-4 border-yellow-500 p-4 rounded';

  const errorText = document.createElement('p');
  errorText.className = 'text-yellow-800';
  errorText.textContent = '⚠️ ' + message;

  errorDiv.appendChild(errorText);
  container.appendChild(errorDiv);
}

function getProgressColor(percent) {
  if (percent >= 90) return 'bg-red-600';
  if (percent >= 80) return 'bg-orange-500';
  if (percent >= 70) return 'bg-yellow-500';
  return 'bg-green-600';
}

// Refresh functionality
document.addEventListener('DOMContentLoaded', () => {
  loadMetrics();

  // Refresh button
  const refreshBtn = document.getElementById('refresh-btn');
  if (refreshBtn) {
    refreshBtn.addEventListener('click', loadMetrics);
  }

  // Auto-refresh every 5 minutes
  setInterval(loadMetrics, 5 * 60 * 1000);
});