// Helper function: decode each segment then re-encode to avoid double encoding.
function encodeSubpath(subpath) {
  if (!subpath) return '';
  return subpath
    .split('/')
    .map(segment => encodeURIComponent(decodeURIComponent(segment)))
    .join('/');
}

// Global variable for gallery images (updated from current folder)
let currentGalleryImages = [];

// Render breadcrumbs, directories (grid view when appropriate), and files.
function renderContent(data) {
  let breadcrumbHTML = '';
  data.breadcrumbs.forEach((crumb, index) => {
    breadcrumbHTML += `<a href="#" class="breadcrumb-link" data-path="${crumb.path}">${crumb.name}</a>`;
    if (index < data.breadcrumbs.length - 1) {
      breadcrumbHTML += `<span>&gt;</span>`;
    }
  });
  document.getElementById('breadcrumbs').innerHTML = breadcrumbHTML;

  let contentHTML = '';

  // Render directories.
  if (data.directories.length > 0) {
    contentHTML += '<ul>';
    // Check if every directory name is short (≤15 characters)
    const areAllShort = data.directories.every(dir => dir.name.length <= 15);
    if (areAllShort) {
      contentHTML += '<div class="directories-grid">';
      data.directories.forEach(dir => {
        contentHTML += `<div class="directory-item">📁 <a href="#" class="directory-link" data-path="${dir.path}">${dir.name}</a></div>`;
      });
      contentHTML += '</div>';
    } else {
      contentHTML += '<ul>';
      data.directories.forEach(dir => {
        contentHTML += `<li class="directory-item">📁 <a href="#" class="directory-link" data-path="${dir.path}">${dir.name}</a></li>`;
      });
      contentHTML += '</ul>';
    }
  }

  // Render files.
  if (data.files.length > 0) {
    contentHTML += '<ul>';
    data.files.forEach(file => {
      let symbol = '';
      if (file.file_type === 'music') {
        symbol = '🎵';
      } else if (file.file_type === 'image') {
        symbol = '🖼️';
      }
      contentHTML += `<li class="file-item">
              <a href="#" class="play-file" data-url="${file.path}" data-file-type="${file.file_type}">${symbol} ${file.name}</a>`;
      if (file.has_transcript) {
        contentHTML += `<a href="#" class="show-transcript" data-url="${file.transcript_url}" title="Show Transcript">&#128196;</a>`;
      }
      contentHTML += `</li>`;
    });
    contentHTML += '</ul>';
  }

  document.getElementById('content').innerHTML = contentHTML;

  // Update global variable for gallery images (only image files).
  currentGalleryImages = data.files
    .filter(f => f.file_type === 'image')
    .map(f => f.path);

  attachEventListeners(); // Reattach event listeners for newly rendered elements.
}

// Fetch directory data from the API.
function loadDirectory(subpath) {
  const encodedPath = encodeSubpath(subpath);
  const apiUrl = '/api/path/' + encodedPath;
  fetch(apiUrl)
    .then(response => response.json())
    .then(data => {
      renderContent(data);
    })
    .catch(error => {
      console.error('Error loading directory:', error);
      document.getElementById('content').innerHTML = '<p>Error loading directory.</p>';
    });
}

// Attach event listeners for directory, breadcrumb, file, and transcript links.
function attachEventListeners() {
  // Directory link clicks.
  document.querySelectorAll('.directory-link').forEach(link => {
    link.addEventListener('click', function (event) {
      event.preventDefault();
      const newPath = this.getAttribute('data-path');
      loadDirectory(newPath);
      history.pushState({ subpath: newPath }, '', newPath ? '/path/' + newPath : '/');
    });
  });

  // Breadcrumb link clicks.
  document.querySelectorAll('.breadcrumb-link').forEach(link => {
    link.addEventListener('click', function (event) {
      event.preventDefault();
      const newPath = this.getAttribute('data-path');
      loadDirectory(newPath);
      history.pushState({ subpath: newPath }, '', newPath ? '/path/' + newPath : '/');
    });
  });

  // File play link clicks.
  document.querySelectorAll('.play-file').forEach(link => {
    link.addEventListener('click', function (event) {
      event.preventDefault();
      const fileType = this.getAttribute('data-file-type');
      const relUrl = this.getAttribute('data-url');
      if (fileType === 'music') {
        const mediaUrl = '/media/' + relUrl;
        const audioPlayer = document.getElementById('globalAudio');
        audioPlayer.src = mediaUrl;
        audioPlayer.load();
        audioPlayer.play();
        document.getElementById('nowPlayingInfo').textContent = relUrl;
        document.querySelector('footer').style.display = 'flex';
      } else if (fileType === 'image') {
        // Open gallery modal via gallery.js function.
        openGalleryModal(relUrl);
      }
    });
  });

  // Transcript icon clicks.
  document.querySelectorAll('.show-transcript').forEach(link => {
    link.addEventListener('click', function (event) {
      event.preventDefault();
      const url = this.getAttribute('data-url');
      fetch(url)
        .then(response => {
          if (!response.ok) {
            throw new Error('Network response was not ok');
          }
          return response.text();
        })
        .then(data => {
          document.getElementById('transcriptContent').innerHTML = marked.parse(data);
          document.getElementById('transcriptModal').style.display = 'block';
        })
        .catch(error => {
          document.getElementById('transcriptContent').innerHTML = '<p>Error loading transcription.</p>';
          document.getElementById('transcriptModal').style.display = 'block';
        });
    });
  });
}

// Modal close logic for transcript modal.
document.addEventListener('DOMContentLoaded', function () {
  const closeBtn = document.querySelector('#transcriptModal .close');
  closeBtn.addEventListener('click', function () {
    document.getElementById('transcriptModal').style.display = 'none';
  });
  window.addEventListener('click', function (event) {
    if (event.target == document.getElementById('transcriptModal')) {
      document.getElementById('transcriptModal').style.display = 'none';
    }
  });

  // Load initial directory based on URL.
  let initialSubpath = '';
  if (window.location.pathname.indexOf('/path/') === 0) {
    initialSubpath = window.location.pathname.substring(6); // remove "/path/"
  }
  loadDirectory(initialSubpath);
});

// Handle back/forward navigation.
window.addEventListener('popstate', function (event) {
  const subpath = event.state ? event.state.subpath : '';
  loadDirectory(subpath);
});