/**
 * Transmission RSS Manager - System Status Module
 * @description Functionality for system status display and updates
 */

// System status and updates functionality
function initSystemStatus() {
  // Elements
  const versionElement = document.getElementById('system-version');
  const uptimeElement = document.getElementById('uptime');
  const transmissionStatusElement = document.getElementById('transmission-status');
  const updateStatusElement = document.getElementById('update-status');
  const updateAvailableDiv = document.getElementById('update-available');
  const updateButton = document.getElementById('btn-update-now');
  const refreshButton = document.getElementById('btn-refresh-status');
  
  // Load system status
  function loadSystemStatus() {
    fetch('/api/system/status', {
      headers: authHeaders()
    })
      .then(handleResponse)
      .then(data => {
        if (data.status === 'success') {
          // Update version display
          versionElement.textContent = data.data.version;
          uptimeElement.textContent = data.data.uptime;
          
          // Also update footer version
          const footerVersion = document.getElementById('footer-version');
          if (footerVersion) {
            footerVersion.textContent = 'v' + data.data.version;
          }

          // Update version in about modal too if it exists
          const aboutVersionElement = document.getElementById('about-version');
          if (aboutVersionElement) {
            aboutVersionElement.textContent = 'Transmission RSS Manager v' + data.data.version;
          }
          
          // Update transmission status with icon
          if (data.data.transmissionStatus === 'Connected') {
            transmissionStatusElement.innerHTML = '<i class="fas fa-check-circle text-success"></i> Connected';
          } else {
            transmissionStatusElement.innerHTML = '<i class="fas fa-times-circle text-danger"></i> Disconnected';
          }
        } else {
          showNotification('Failed to load system status', 'danger');
        }
      })
      .catch(error => {
        console.error('Error fetching system status:', error);
        showNotification('Failed to connect to server', 'danger');
      });
  }
  
  // More robust update check status tracking
  const UPDATE_KEY = 'trm_update_available';
  const CURRENT_VERSION_KEY = 'trm_current_version';
  const REMOTE_VERSION_KEY = 'trm_remote_version';
  let updateCheckInProgress = false;
  
  // Function to show update alert
  function showUpdateAlert(currentVersion, remoteVersion) {
    // Set status text in the system status panel
    updateStatusElement.innerHTML = '<i class="fas fa-exclamation-circle text-warning"></i> Update available';
    
    // Try to show the original alert box, but don't rely on it
    try {
      const alertBox = updateAvailableDiv.querySelector('.alert');
      if (alertBox) {
        alertBox.style.display = 'block';
        const spanElement = alertBox.querySelector('span');
        if (spanElement) {
          spanElement.textContent = `A new version is available: ${currentVersion} → ${remoteVersion}`;
        }
      }
    } catch (e) {
      console.error('Error showing original alert box:', e);
    }
    
    // Show the floating notification (our new approach)
    try {
      const floatingNotification = document.getElementById('floating-update-notification');
      if (floatingNotification) {
        // Set text
        const versionElement = document.getElementById('floating-update-version');
        if (versionElement) {
          versionElement.textContent = `Version ${currentVersion} → ${remoteVersion}`;
        }
        
        // Show with inline styles to force display
        floatingNotification.style.display = 'block';
        
        // Make absolutely sure it's visible
        floatingNotification.setAttribute('style', 
          'display: block !important; ' +
          'visibility: visible !important; ' +
          'opacity: 1 !important; ' +
          'position: fixed !important; ' +
          'top: 20px !important; ' +
          'right: 20px !important; ' +
          'width: 300px !important; ' +
          'padding: 15px !important; ' +
          'background-color: #ff5555 !important; ' +
          'color: white !important; ' +
          'border: 3px solid #cc0000 !important; ' +
          'border-radius: 5px !important; ' +
          'box-shadow: 0 0 20px rgba(0,0,0,0.5) !important; ' +
          'z-index: 10000 !important; ' +
          'font-weight: bold !important; ' +
          'text-align: center !important;'
        );
        
        // Set up update button click handler
        const updateButton = document.getElementById('floating-update-button');
        if (updateButton) {
          // Remove any existing listeners
          updateButton.removeEventListener('click', applyUpdate);
          // Add new listener
          updateButton.addEventListener('click', applyUpdate);
        }
        
        console.log('Floating update notification shown:', currentVersion, '->', remoteVersion);
      } else {
        console.error('Floating notification element not found!');
      }
    } catch (e) {
      console.error('Error showing floating notification:', e);
    }
    
    // Store in localStorage
    localStorage.setItem(UPDATE_KEY, 'true');
    localStorage.setItem(CURRENT_VERSION_KEY, currentVersion);
    localStorage.setItem(REMOTE_VERSION_KEY, remoteVersion);
  }
  
  // Function to hide update alert
  function hideUpdateAlert() {
    // Hide original alert
    try {
      const alertBox = updateAvailableDiv.querySelector('.alert');
      if (alertBox) {
        alertBox.style.display = 'none';
      }
    } catch (e) {
      console.error('Error hiding original alert:', e);
    }
    
    // Hide floating notification
    try {
      const floatingNotification = document.getElementById('floating-update-notification');
      if (floatingNotification) {
        floatingNotification.style.display = 'none';
      }
    } catch (e) {
      console.error('Error hiding floating notification:', e);
    }
    
    // Clear localStorage
    localStorage.removeItem(UPDATE_KEY);
    localStorage.removeItem(CURRENT_VERSION_KEY);
    localStorage.removeItem(REMOTE_VERSION_KEY);
  }
  
  // Check localStorage on init and set up MutationObserver to prevent hiding
  (function checkStoredUpdateStatus() {
    const isUpdateAvailable = localStorage.getItem(UPDATE_KEY) === 'true';
    if (isUpdateAvailable) {
      const currentVersion = localStorage.getItem(CURRENT_VERSION_KEY);
      const remoteVersion = localStorage.getItem(REMOTE_VERSION_KEY);
      if (currentVersion && remoteVersion) {
        showUpdateAlert(currentVersion, remoteVersion);
        
        // Set up mutation observer to detect and revert any attempts to hide the update alert
        const alertBox = updateAvailableDiv.querySelector('.alert');
        if (alertBox) {
          const observer = new MutationObserver(function(mutations) {
            mutations.forEach(function(mutation) {
              if (mutation.type === 'attributes' && 
                 (mutation.attributeName === 'style' || 
                  mutation.attributeName === 'class')) {
                
                // If display is being changed to hide the element, force it back to visible
                if (alertBox.style.display !== 'block' || 
                    alertBox.classList.contains('d-none') ||
                    alertBox.style.visibility === 'hidden' ||
                    alertBox.style.opacity === '0') {
                  
                  console.log('Detected attempt to hide update button, forcing display');
                  showUpdateAlert(currentVersion, remoteVersion);
                }
              }
            });
          });
          
          // Observe style and class attribute changes
          observer.observe(alertBox, { 
            attributes: true, 
            attributeFilter: ['style', 'class'] 
          });
          
          // Store observer in window object to prevent garbage collection
          window._updateButtonObserver = observer;
        }
      }
    }
  })();
  
  // Check for updates
  function checkForUpdates() {
    updateStatusElement.innerHTML = '<i class="fas fa-circle-notch fa-spin"></i> Checking...';
    updateCheckInProgress = true;
    
    // Add test=true parameter to force update availability for testing
    const testMode = localStorage.getItem('showUpdateButton') === 'true';
    const url = testMode ? '/api/system/check-updates?test=true' : '/api/system/check-updates';
    
    // Set a timeout to detect network issues
    const timeoutId = setTimeout(() => {
      updateStatusElement.innerHTML = '<i class="fas fa-times-circle text-danger"></i> Check timed out';
      updateCheckInProgress = false;
      showNotification('Update check timed out. Please try again later.', 'warning');
    }, 10000); // 10 second timeout
    
    // Create a timeout controller
    const controller = new AbortController();
    const timeoutId2 = setTimeout(() => controller.abort(), 15000);

    fetch(url, {
      headers: authHeaders(),
      // Add a fetch timeout using abort controller
      signal: controller.signal // 15 second timeout
    })
      .then(response => {
        clearTimeout(timeoutId2);
        clearTimeout(timeoutId);
        return response;
      })
      .catch(error => {
        clearTimeout(timeoutId2);
        clearTimeout(timeoutId);
        throw error;
      })
      .then(response => {
        // Better error checking
        if (!response.ok) {
          return response.json().then(data => {
            throw new Error(data.message || `Server error: ${response.status}`);
          }).catch(e => {
            if (e instanceof SyntaxError) {
              throw new Error(`Server error: ${response.status}`);
            }
            throw e;
          });
        }
        return response.json();
      })
      .then(data => {
        updateCheckInProgress = false;
        
        if (data.status === 'success') {
          if (data.data && data.data.updateAvailable) {
            // Show update alert with version info
            showUpdateAlert(data.data.currentVersion, data.data.remoteVersion);
            
            // Log to console for debugging
            console.log('Update available detected:', data.data.currentVersion, '->', data.data.remoteVersion);
          } else {
            // No update available
            updateStatusElement.innerHTML = '<i class="fas fa-check-circle text-success"></i> Up to date';
            hideUpdateAlert();
          }
        } else {
          // Error status but with a response
          updateStatusElement.innerHTML = '<i class="fas fa-times-circle text-danger"></i> Check failed';
          showNotification(data.message || 'Failed to check for updates', 'danger');
          // Don't clear update status on error - keep any previous update notification
        }
      })
      .catch(error => {
        updateCheckInProgress = false;
        clearTimeout(timeoutId);
        console.error('Error checking for updates:', error);
        updateStatusElement.innerHTML = '<i class="fas fa-times-circle text-danger"></i> Check failed';
        
        // More specific error message based on the error type
        if (error.name === 'AbortError') {
          showNotification('Update check timed out. Please try again later.', 'warning');
        } else if (error.message.includes('Failed to fetch') || error.message.includes('NetworkError')) {
          showNotification('Network error. Please check your connection and try again.', 'danger');
        } else {
          showNotification(error.message || 'Failed to connect to server', 'danger');
        }
        
        // Don't clear update status on error - keep any previous update notification
      });
  }
  
  // Apply update
  function applyUpdate() {
    // Show confirmation dialog
    if (!confirm('Are you sure you want to update the application? The service will restart.')) {
      return;
    }
    
    // Show loading state
    updateButton.disabled = true;
    updateButton.innerHTML = '<i class="fas fa-circle-notch fa-spin"></i> Updating...';
    showNotification('Applying update. Please wait...', 'info');
    
    // Set a timeout for the update process
    const updateTimeoutId = setTimeout(() => {
      updateButton.disabled = false;
      updateButton.innerHTML = '<i class="fas fa-download"></i> Update Now';
      showNotification('Update process timed out. Please try again or check server logs.', 'warning');
    }, 60000); // 60 second timeout for the entire update process
    
    // Create a timeout controller
    const updateController = new AbortController();
    const updateTimeoutId2 = setTimeout(() => updateController.abort(), 45000);

    fetch('/api/system/update', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        ...authHeaders()
      },
      signal: updateController.signal // 45 second timeout
    })
      .then(response => {
        clearTimeout(updateTimeoutId2);
        return response;
      })
      .catch(error => {
        clearTimeout(updateTimeoutId2);
        throw error;
      })
      .then(response => {
        // Better error checking
        if (!response.ok) {
          return response.json().then(data => {
            throw new Error(data.message || `Server error: ${response.status}`);
          }).catch(e => {
            if (e instanceof SyntaxError) {
              throw new Error(`Server error: ${response.status}`);
            }
            throw e;
          });
        }
        return response.json();
      })
      .then(data => {
        clearTimeout(updateTimeoutId);
        
        if (data.status === 'success') {
          showNotification('Update applied successfully. The page will reload in 30 seconds.', 'success');
          
          // Show a countdown to reload
          let secondsLeft = 30;
          updateButton.innerHTML = `<i class="fas fa-sync"></i> Reloading in ${secondsLeft}s...`;
          
          const countdownInterval = setInterval(() => {
            secondsLeft--;
            updateButton.innerHTML = `<i class="fas fa-sync"></i> Reloading in ${secondsLeft}s...`;
            
            if (secondsLeft <= 0) {
              clearInterval(countdownInterval);
              window.location.reload();
            }
          }, 1000);
          
          // Set a timer to reload the page after the service has time to restart
          setTimeout(() => {
            clearInterval(countdownInterval);
            window.location.reload();
          }, 30000);
        } else {
          updateButton.disabled = false;
          updateButton.innerHTML = '<i class="fas fa-download"></i> Update Now';
          showNotification(data.message || 'Failed to apply update', 'danger');
        }
      })
      .catch(error => {
        clearTimeout(updateTimeoutId);
        console.error('Error applying update:', error);
        updateButton.disabled = false;
        updateButton.innerHTML = '<i class="fas fa-download"></i> Update Now';
        
        // More specific error message based on the error type
        if (error.name === 'AbortError') {
          showNotification('Update request timed out. The server might still be processing the update.', 'warning');
        } else if (error.message.includes('Failed to fetch') || error.message.includes('NetworkError')) {
          showNotification('Network error. Please check your connection and try again.', 'danger');
        } else {
          showNotification(error.message || 'Failed to connect to server', 'danger');
        }
      });
  }
  
  // Event listeners
  if (refreshButton) {
    refreshButton.addEventListener('click', () => {
      loadSystemStatus();
      checkForUpdates();
    });
  }
  
  if (updateButton) {
    updateButton.addEventListener('click', applyUpdate);
  }
  
  // Test mode toggle (for developers)
  const testToggle = document.getElementById('toggle-test-update-button');
  if (testToggle) {
    // Initialize based on current localStorage setting
    const isTestMode = localStorage.getItem('showUpdateButton') === 'true';
    
    // Update toggle text
    testToggle.innerText = isTestMode ? 'Disable Test Update' : 'Enable Test Update';
    
    // Add click handler
    testToggle.addEventListener('click', (e) => {
      e.preventDefault();
      const currentSetting = localStorage.getItem('showUpdateButton') === 'true';
      const newSetting = !currentSetting;
      
      localStorage.setItem('showUpdateButton', newSetting);
      testToggle.innerText = newSetting ? 'Disable Test Update' : 'Enable Test Update';
      
      if (newSetting) {
        // If enabling test mode, force show update button
        showUpdateAlert('2.0.10', '2.1.0-test');
        updateStatusElement.innerHTML = '<i class="fas fa-exclamation-circle text-warning"></i> Update available';
        showNotification('Test update button enabled', 'info');
      } else {
        // If disabling test mode, check for real updates
        hideUpdateAlert();
        checkForUpdates();
        showNotification('Test update button disabled', 'info');
      }
    });
  }
  
  // Persistent update button - force display every second if update is available
  function forceShowUpdateButton() {
    const isUpdateAvailable = localStorage.getItem(UPDATE_KEY) === 'true';
    
    if (isUpdateAvailable) {
      const currentVersion = localStorage.getItem(CURRENT_VERSION_KEY);
      const remoteVersion = localStorage.getItem(REMOTE_VERSION_KEY);
      
      if (currentVersion && remoteVersion) {
        // Check floating notification
        const floatingNotification = document.getElementById('floating-update-notification');
        if (floatingNotification && floatingNotification.style.display !== 'block') {
          console.log('Forcing floating update notification display');
          
          // Set the version text
          const versionElement = document.getElementById('floating-update-version');
          if (versionElement) {
            versionElement.textContent = `Version ${currentVersion} → ${remoteVersion}`;
          }
          
          // Apply strong styling
          floatingNotification.setAttribute('style', 
            'display: block !important; ' +
            'visibility: visible !important; ' +
            'opacity: 1 !important; ' +
            'position: fixed !important; ' +
            'top: 20px !important; ' +
            'right: 20px !important; ' +
            'width: 300px !important; ' +
            'padding: 15px !important; ' +
            'background-color: #ff5555 !important; ' +
            'color: white !important; ' +
            'border: 3px solid #cc0000 !important; ' +
            'border-radius: 5px !important; ' +
            'box-shadow: 0 0 20px rgba(0,0,0,0.5) !important; ' +
            'z-index: 10000 !important; ' +
            'font-weight: bold !important; ' +
            'text-align: center !important;'
          );
          
          // Ensure button has correct event handler
          const updateButton = document.getElementById('floating-update-button');
          if (updateButton) {
            // Remove any existing listeners
            updateButton.removeEventListener('click', applyUpdate);
            // Add new listener
            updateButton.addEventListener('click', applyUpdate);
          }
        }
        
        // Still try the original alert as a fallback
        try {
          const alertBox = updateAvailableDiv.querySelector('.alert');
          if (alertBox && alertBox.style.display !== 'block') {
            alertBox.style.display = 'block';
            updateAvailableDiv.style.display = 'block';
            
            // Update message
            const spanElement = alertBox.querySelector('span');
            if (spanElement) {
              spanElement.textContent = `A new version is available: ${currentVersion} → ${remoteVersion}`;
            }
          }
        } catch (e) {
          console.error('Error forcing original update button:', e);
        }
      }
    }
  }
  
  // Initialize
  loadSystemStatus();
  checkForUpdates();
  
  // Force check the update button status every second
  setInterval(forceShowUpdateButton, 1000);
  
  // Set interval to refresh uptime every minute
  setInterval(loadSystemStatus, 60000);
}