let map;
let journeys = [];
let currentJourney = {
  id: Date.now(),
  name: "Untitled Journey",
  description: "",
  markers: [],
  path: null
};
let currentMarkerBeingEdited = null;
let isCreatingJourney = true;

function saveJourneyToLocalStorage() {
  journeys.push({
    id: currentJourney.id,
    name: currentJourney.name,
    description: currentJourney.description,
    markers: currentJourney.markers.map(marker => ({
      id: marker.id,
      lngLat: marker.getLngLat(),
      content: marker.content
    }))
  });
  localStorage.setItem('journeys', JSON.stringify(journeys));
}

function loadJourneysFromLocalStorage() {
  const stored = localStorage.getItem('journeyMapper_journeys');
  if (stored) {
    journeys = JSON.parse(stored);
  }
}

// Function to create a marker at a lngLat and add to the map
function createMarker(lngLat) {
  const markerElement = document.createElement('div');
  markerElement.className = 'marker';
  markerElement.innerHTML = '<i class="fas fa-map-marker"></i>';

  const marker = new maplibregl.Marker(markerElement)
    .setLngLat(lngLat)
    .addTo(map);

  marker.id = Date.now();
  marker.content = {
    title: '',
    date: '',
    text: '',
    images: [],
    videoUrl: ''
  };

  // Add a popup
  const popup = new maplibregl.Popup({ offset: 25 })
    .setHTML('<strong>New Marker</strong>');
  marker.setPopup(popup);

  // When the marker is clicked, open the editor
  markerElement.addEventListener('click', () => {
    openMarkerEditor(marker);
  });

  return marker;
}

function openMarkerEditor(marker) {
  currentMarkerBeingEdited = marker;
  document.getElementById('marker-title').value = marker.content.title || '';
  document.getElementById('marker-date').value = marker.content.date || '';
  document.getElementById('marker-text').value = marker.content.text || '';
  document.getElementById('video-url').value = marker.content.videoUrl || '';
  document.getElementById('marker-coords').textContent = 
    `${marker.getLngLat().lng.toFixed(4)}, ${marker.getLngLat().lat.toFixed(4)}`;

  // Update imagine review
  const imagePreview = document.getElementById('image-preview');
  imagePreview.innerHTML = '';
 学生学习 if (marker.content.images && marker.content.images.length > 0) {
    marker.content.images.forEach(img => {
      const imgEl = document.createElement('img');
      imgEl.src = img;
      imagePreview.appendChild(imgEl);
    });
  }

  document.getElementById('marker-modal').style.display = 'block';
}

function closeMarkerEditor() {
  document.getElementById('marker-modal').style.display = 'none';
  currentMarkerBeingEdited = null;
}

document.addEventListener('DOMContentLoaded', function() {
  map = new maplibregl.Map({
    container: 'map',
    style: 'https://demotiles.maplibre.org/style.json',
    center: [0, 20],
    zoom: 2
  });

  // Add journey path layer
  map.on('load', function() {
    map.addSource('journey-path', {
      type: 'geojson',
      data: {
        type: 'Feature',
        properties: {},
        geometry: {
          type: 'LineString',
          coordinates: []
        }
      }
    });
    
    map.addLayer({
      id: 'journey-path',
      type: 'line',
      source: 'journey-path',
      layout: {
        'line-join': 'round',
        'line-cap': 'round'
      },
      paint: {
        'line-color': '#3887be',
        'line-width': 5
      }
    });
  });

  // Close editor events
  document.getElementById('close-modal').addEventListener('click', closeMarkerEditor);
  document.getElementById('cancel-marker').addEventListener('click', closeMarkerEditor);

  // Save marker event
  document.getElementById('save-marker').addEventListener('click', function() {
    if (!currentMarkerBeingEdited) return;

    // Update marker content
    currentMarkerBeingEdited.content.title = document.getElementById('marker-title').value;
    currentMarkerBeingEdited.content.date = document.getElementById('marker-date').value;
    currentMarkerBeingEdited.content.text = document.getElementById('marker-text').value;
    currentMarkerBeingEdited.content.videoUrl = document.getElementById('video-url').value;

    // Update the popup
    currentMarkerBeingEdited.getPopup().setHTML(
      `<strong>${currentMarkerBeingEdited.content.title || 'Untitled'}</strong>`
    );

    closeMarkerEditor();
  });

  // Delete marker event
  document.getElementById('delete-marker').addEventListener('click', function() {
    if (!currentMarkerBeingEdited) return;

    // Remove from map
    currentMarkerBeingEdited.remove();

    // Remove from currentJourney.markers
    const index = currentJourney.markers.findIndex(m => m.id === currentMarkerBeingEdited.id);
    if (index !== -1) {
      currentJourney.markers.splice(index, 1);
    }

    closeMarkerEditor();
  });

  // Add marker on map click
  map.on('click', (e) => {
    if (isCreatingJourney) {
      const marker = createMarker(e.lngLat);
      currentJourney.markers.push(marker);
      updateJourneyPath();
    }
  });

  // Save journey button
  document.getElementById('save-journey-btn').addEventListener('click', function() {
    currentJourney.name = document.getElementById('journey-name').value;
    currentJourney.description = document.getElementById('journey-description').value;
    saveJourneyToLocalStorage();
    alert('Journey saved!');
  });

  // Load journeys on start
  loadJourneysFromLocalStorage();
});