// /Volumes/Data/Code/FHGR/Frontend/js/main.js
document.addEventListener('DOMContentLoaded', function() {
  // Initialize global variables
  window.currentJourney = {
    id: Date.now(),
    name: "Untitled Journey",
    description: "",
    markers: [],
    path: null
  };
  window.journeys = [];
  window.isCreatingJourney = true;

  // Initialize the map
  const map = new maplibregl.Map({
    container: 'map',
    style: 'https://demotiles.maplibre.org/style.json',
    center: [8.5, 47.3],
    zoom: 10
  });

  // Add navigation controls
  map.addControl(new maplibregl.NavigationControl());

  // Add geolocate control
  map.addControl(new maplibregl.GeolocateControl({
    positionOptions: {
      enableHighAccuracy: true
    },
    trackUserLocation: true
  }));

  // Add fullscreen control
  map.addControl(new maplibregl.FullscreenControl());

  // Mode switching
  const modeCreateBtn = document.getElementById('mode-create');
  const modeViewBtn = document.getElementById('mode-view');
  const createPanel = document.getElementById('create-panel');
  const viewPanel = document.getElementById('view-panel');
  const markersContainer = document.getElementById('markers-container');
  const emptyMarkers = document.getElementById('empty-markers');

  function switchMode(mode) {
    if (mode === 'create') {
      modeCreateBtn.classList.add('active');
      modeViewBtn.classList.remove('active');
      createPanel.classList.add('active-panel');
      viewPanel.classList.remove('active-panel');
      // Enable marker adding
      window.isCreatingJourney = true;
    } else { // view mode
      modeCreateBtn.classList.remove('active');
      modeViewBtn.classList.add('active');
      createPanel.classList.remove('active-panel');
      viewPanel.classList.add('active-panel');
      // Disable marker adding
      window.isCreatingJourney = false;
    }
  }

  modeCreateBtn.addEventListener('click', () => switchMode('create'));
  modeViewBtn.addEventListener('click', () => switchMode('view'));

  async function loadJourneysFromBackend() {
    try {
      const response = await fetch('http://localhost:5000/api/journeys');
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      const journeysData = await response.json();
      
      // Ensure we always have an array
      if (!Array.isArray(journeysData)) {
        console.warn('Expected array of journeys, got:', journeysData);
        window.journeys = [];
        return [];
      }
      
      window.journeys = journeysData;
      populateJourneySelect(journeysData);
      return journeysData;
    } catch (err) {
      console.error('Error loading journeys from backend:', err);
      // Fallback to local storage
      const savedJourneys = localStorage.getItem('journeys');
      if (savedJourneys) {
        try {
          const parsedJourneys = JSON.parse(savedJourneys);
          if (Array.isArray(parsedJourneys)) {
            window.journeys = parsedJourneys;
            populateJourneySelect(window.journeys);
            return window.journeys;
          } else {
            console.warn('Saved journeys are not an array:', parsedJourneys);
            window.journeys = [];
            populateJourneySelect([]);
            return [];
          }
        } catch (parseError) {
          console.error('Error parsing saved journeys:', parseError);
          window.journeys = [];
          populateJourneySelect([]);
          return [];
        }
      }
      // If no data available, initialize empty array
      window.journeys = [];
      populateJourneySelect([]);
      return [];
    }
  }

  async function saveJourneyToBackend(journey) {
    try {
      const response = await fetch('http://localhost:5000/api/journeys', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({
          id: journey.id,
          name: journey.name,
          description: journey.description,
          markers: journey.markers.map(marker => ({
            lngLat: marker.getLngLat().toArray(),
            content: marker.content
          }))
        })
      });
      
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      
      const journeyData = await response.json();
      console.log('Journey saved:', journeyData);
      return journeyData;
    } catch (err) {
      console.error('Error saving journey to backend:', err);
      // Fallback to local storage
      const savedJourneys = localStorage.getItem('journeys') || '[]';
      const journeys = JSON.parse(savedJourneys);
      
      // Update or add the journey
      const existingIndex = journeys.findIndex(j => j.id === journey.id);
      if (existingIndex !== -1) {
        journeys[existingIndex] = {
          id: journey.id,
          name: journey.name,
          description: journey.description,
          markers: journey.markers.map(marker => ({
            id: marker.id,
            lngLat: marker.getLngLat(),
            content: marker.content
          }))
        };
      } else {
        journeys.push({
          id: journey.id,
          name: journey.name,
          description: journey.description,
          markers: journey.markers.map(marker => ({
            id: marker.id,
            lngLat: marker.getLngLat(),
            content: marker.content
          }))
        });
      }
      
      localStorage.setItem('journeys', JSON.stringify(journeys));
      console.log('Journey saved to local storage');
      return journey;
    }
  }

  async function loadCurrentJourneyFromBackend(journeyId) {
    try {
      const response = await fetch(`http://localhost:5000/api/journeys/${journeyId}`);
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      const journeyData = await response.json();
      
      // Update the current journey object
      window.currentJourney = {
        id: journeyData.id,
        name: journeyData.name,
        description: journeyData.description,
        markers: [],
        path: null
      };
      
      // Create markers from the journey data
      if (Array.isArray(journeyData.markers)) {
        journeyData.markers.forEach(markerData => {
          const lngLat = maplibregl.LngLat.fromArray(markerData.lngLat);
          const marker = window.createMarker(lngLat, markerData.content);
          window.currentJourney.markers.push(marker);
        });
      }
      
      // Update the journey path
      updateJourneyPath();
      
      return journeyData;
    } catch (err) {
      console.error('Error loading journey from backend:', err);
      // Fallback to local storage
      const savedJourneys = localStorage.getItem('journeys');
      if (savedJourneys) {
        try {
          const journeys = JSON.parse(savedJourneys);
          if (Array.isArray(journeys)) {
            const journey = journeys.find(j => j.id === journeyId);
            if (journey) {
              // Update the current journey object
              window.currentJourney = {
                id: journey.id,
                name: journey.name,
                description: journey.description,
                markers: [],
                path: null
              };
              
              // Create markers from the journey data
              if (Array.isArray(journey.markers)) {
                journey.markers.forEach(markerData => {
                  const lngLat = maplibregl.LngLat.fromArray(markerData.lngLat);
                  const marker = window.createMarker(lngLat, markerData.content);
                  window.currentJourney.markers.push(marker);
                });
              }
              
              // Update the journey path
              updateJourneyPath();
              
              console.log('Journey loaded from local storage');
              return journey;
            }
          } else {
            console.warn('Saved journeys are not an array:', journeys);
          }
        } catch (parseError) {
          console.error('Error parsing saved journeys:', parseError);
        }
      }
      // If no data available, return null
      return null;
    }
  }

  // Update the journey select dropdown
  function populateJourneySelect(journeys) {
    const select = document.getElementById('journey-select');
    select.innerHTML = '<option value="">-- Choose a journey --</option>';
    select.innerHTML += '<option value="all">Show All Journeys</option>';
    
    // Sort journeys by name for consistent ordering
    const sortedJourneys = [...journeys].sort((a, b) => a.name.localeCompare(b.name));
    
    sortedJourneys.forEach(journey => {
      const option = document.createElement('option');
      option.value = journey.id;
      option.textContent = journey.name;
      select.appendChild(option);
    });
  }

  // Toggle sidebar
  document.getElementById('toggle-sidebar').addEventListener('click', function() {
    document.querySelector('.sidebar').classList.toggle('collapsed');
  });
  
  // Initialize in create mode
  switchMode('create');
  
  // Load journeys from backend when the page loads
  loadJourneysFromBackend().then(() => {
    // If there are journeys, set the first one as the current journey
    if (window.journeys.length > 0) {
      // Set the first journey as current
      const firstJourney = window.journeys[0];
      loadCurrentJourneyFromBackend(firstJourney.id).then(() => {
        // Update the journey title and description
        document.getElementById('journey-title').value = currentJourney.name;
        document.getElementById('journey-description').value = currentJourney.description;
      });
    }
  });

  // Add journey selection functionality
  document.getElementById('journey-select').addEventListener('change', function() {
    const selectedId = this.value;
    
    if (selectedId === 'all') {
      // Show all journeys
      // Implementation depends on how you want to display multiple journeys
      return;
    }
    
    if (selectedId) {
      // Load the selected journey
      loadCurrentJourneyFromBackend(selectedId).then(() => {
        // Update the journey title and description
        document.getElementById('journey-title').value = currentJourney.name;
        document.getElementById('journey-description').value = currentJourney.description;
        
        // Update the journey info panel
        document.getElementById('info-title').textContent = currentJourney.name;
        document.getElementById('info-description').textContent = currentJourney.description;
        document.getElementById('info-marker-count').textContent = currentJourney.markers.length;
        document.getElementById('info-date').textContent = new Date().toLocaleDateString();
      });
    }
  });

  // View blog post button
  document.getElementById('view-blog').addEventListener('click', function() {
    // Implementation depends on your blog system
    alert('Viewing blog post for this journey...');
  });

  // Edit journey button
  document.getElementById('edit-journey').addEventListener('click', function() {
    // Switch to create mode
    switchMode('create');
    // Update the journey title and description
    document.getElementById('journey-title').value = currentJourney.name;
    document.getElementById('journey-description').value = currentJourney.description;
  });

  // Delete journey button
  document.getElementById('delete-journey').addEventListener('click', async function() {
    if (confirm('Are you sure you want to delete this journey?')) {
      try {
        const response = await fetch(`http://localhost:5000/api/journeys/${currentJourney.id}`, {
          method: 'DELETE'
        });
        
        if (response.ok) {
          // Remove from the journeys array
          const index = window.journeys.findIndex(j => j.id === currentJourney.id);
          if (index !== -1) {
            window.journeys.splice(index, 1);
          }
          
          // Update the journey select dropdown
          populateJourneySelect(window.journeys);
          
          // Clear the current journey
          currentJourney = {
            id: Date.now(),
            name: "Untitled Journey",
            description: "",
            markers: [],
            path: null
          };
          
          // Clear the map
          map.getSource('journey-path').setData({
            type: 'Feature',
            properties: {},
            geometry: {
              type: 'LineString',
              coordinates: []
            }
          });
          
          // Clear the form
          document.getElementById('journey-title').value = '';
          document.getElementById('journey-description').value = '';
          
          alert('Journey deleted successfully!');
        } else {
          alert('Failed to delete journey.');
        }
      } catch (err) {
        console.error('Error deleting journey:', err);
        // Fallback to local storage
        const savedJourneys = localStorage.getItem('journeys');
        if (savedJourneys) {
          try {
            const journeys = JSON.parse(savedJourneys);
            if (Array.isArray(journeys)) {
              const index = journeys.findIndex(j => j.id === currentJourney.id);
              if (index !== -1) {
                journeys.splice(index, 1);
                localStorage.setItem('journeys', JSON.stringify(journeys));
              }
            }
          } catch (parseError) {
            console.error('Error parsing saved journeys:', parseError);
          }
        }
        alert('Journey deleted successfully (local storage)');
      }
    }
  });
});