/**
 * Modal functionality for file viewing
 */

import { fetchFileContent, fetchData, getVSCodeInstallUrl, copyToClipboard, showToast, downloadFile, shareFile, getResourceType, escapeHtml, getResourceIcon } from './utils';

// Modal state
let currentFilePath: string | null = null;
let currentFileContent: string | null = null;
let currentFileType: string | null = null;

// Collection data cache
interface CollectionItem {
  path: string;
  kind: string;
  usage?: string | null;
}

interface Collection {
  id: string;
  name: string;
  description?: string;
  path: string;
  items: CollectionItem[];
  tags?: string[];
}

interface CollectionsData {
  items: Collection[];
}

let collectionsCache: CollectionsData | null = null;

/**
 * Setup modal functionality
 */
export function setupModal(): void {
  const modal = document.getElementById('file-modal');
  const closeBtn = document.getElementById('close-modal');
  const copyBtn = document.getElementById('copy-btn');
  const downloadBtn = document.getElementById('download-btn');
  const shareBtn = document.getElementById('share-btn');

  if (!modal) return;

  closeBtn?.addEventListener('click', closeModal);
  
  modal.addEventListener('click', (e) => {
    if (e.target === modal) closeModal();
  });

  document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape' && !modal.classList.contains('hidden')) {
      closeModal();
    }
  });

  copyBtn?.addEventListener('click', async () => {
    if (currentFileContent) {
      const success = await copyToClipboard(currentFileContent);
      showToast(success ? 'Copied to clipboard!' : 'Failed to copy', success ? 'success' : 'error');
    }
  });

  downloadBtn?.addEventListener('click', async () => {
    if (currentFilePath) {
      const success = await downloadFile(currentFilePath);
      showToast(success ? 'Download started!' : 'Download failed', success ? 'success' : 'error');
    }
  });

  shareBtn?.addEventListener('click', async () => {
    if (currentFilePath) {
      const success = await shareFile(currentFilePath);
      showToast(success ? 'Link copied to clipboard!' : 'Failed to copy link', success ? 'success' : 'error');
    }
  });

  // Setup install dropdown toggle
  setupInstallDropdown('install-dropdown');

  // Handle browser back/forward navigation
  window.addEventListener('hashchange', handleHashChange);

  // Check for deep link on initial load
  handleHashChange();
}

/**
 * Handle hash changes for deep linking
 */
function handleHashChange(): void {
  const hash = window.location.hash;
  
  if (hash && hash.startsWith('#file=')) {
    const filePath = decodeURIComponent(hash.slice(6));
    if (filePath && filePath !== currentFilePath) {
      const type = getResourceType(filePath);
      openFileModal(filePath, type, false); // Don't update hash since we're responding to it
    }
  } else if (!hash || hash === '#') {
    // No hash or empty hash - close modal if open
    if (currentFilePath) {
      closeModal(false); // Don't update hash since we're responding to it
    }
  }
}

/**
 * Update URL hash for deep linking
 */
function updateHash(filePath: string | null): void {
  if (filePath) {
    const newHash = `#file=${encodeURIComponent(filePath)}`;
    if (window.location.hash !== newHash) {
      history.pushState(null, '', newHash);
    }
  } else {
    if (window.location.hash) {
      history.pushState(null, '', window.location.pathname + window.location.search);
    }
  }
}

/**
 * Setup install dropdown toggle functionality
 */
export function setupInstallDropdown(containerId: string): void {
  const container = document.getElementById(containerId);
  if (!container) return;

  const toggle = container.querySelector('.install-btn-toggle');
  
  toggle?.addEventListener('click', (e) => {
    e.preventDefault();
    e.stopPropagation();
    container.classList.toggle('open');
  });

  // Close dropdown when clicking outside
  document.addEventListener('click', (e) => {
    if (!container.contains(e.target as Node)) {
      container.classList.remove('open');
    }
  });

  // Close dropdown when clicking a menu item
  container.querySelectorAll('.install-dropdown-menu a').forEach(link => {
    link.addEventListener('click', () => {
      container.classList.remove('open');
    });
  });
}

/**
 * Open file viewer modal
 * @param filePath - Path to the file
 * @param type - Resource type (agent, prompt, instruction, etc.)
 * @param updateUrl - Whether to update the URL hash (default: true)
 */
export async function openFileModal(filePath: string, type: string, updateUrl = true): Promise<void> {
  const modal = document.getElementById('file-modal');
  const title = document.getElementById('modal-title');
  const modalContent = document.getElementById('modal-content');
  const contentEl = modalContent?.querySelector('code');
  const installDropdown = document.getElementById('install-dropdown');
  const installBtnMain = document.getElementById('install-btn-main') as HTMLAnchorElement | null;
  const installVscode = document.getElementById('install-vscode') as HTMLAnchorElement | null;
  const installInsiders = document.getElementById('install-insiders') as HTMLAnchorElement | null;
  const copyBtn = document.getElementById('copy-btn');
  const downloadBtn = document.getElementById('download-btn');

  if (!modal || !title || !modalContent) return;

  currentFilePath = filePath;
  currentFileType = type;
  
  // Update URL for deep linking
  if (updateUrl) {
    updateHash(filePath);
  }
  
  // Show modal with loading state
  title.textContent = filePath.split('/').pop() || filePath;
  modal.classList.remove('hidden');

  // Handle collections differently - show as item list
  if (type === 'collection') {
    await openCollectionModal(filePath, title, modalContent, installDropdown, copyBtn, downloadBtn);
    return;
  }

  // Regular file modal
  if (contentEl) {
    contentEl.textContent = 'Loading...';
  }
  
  // Show copy/download buttons for regular files
  if (copyBtn) copyBtn.style.display = 'inline-flex';
  if (downloadBtn) downloadBtn.style.display = 'inline-flex';
  
  // Restore pre/code structure if it was replaced by collection view
  if (!modalContent.querySelector('pre')) {
    modalContent.innerHTML = '<pre id="modal-content"><code></code></pre>';
  }
  const codeEl = modalContent.querySelector('code');

  // Setup install dropdown
  const vscodeUrl = getVSCodeInstallUrl(type, filePath, false);
  const insidersUrl = getVSCodeInstallUrl(type, filePath, true);
  
  if (vscodeUrl && installDropdown) {
    installDropdown.style.display = 'inline-flex';
    installDropdown.classList.remove('open');
    if (installBtnMain) installBtnMain.href = vscodeUrl;
    if (installVscode) installVscode.href = vscodeUrl;
    if (installInsiders) installInsiders.href = insidersUrl || '#';
  } else if (installDropdown) {
    installDropdown.style.display = 'none';
  }

  // Fetch and display content
  const fileContent = await fetchFileContent(filePath);
  currentFileContent = fileContent;
  
  if (fileContent && codeEl) {
    codeEl.textContent = fileContent;
  } else if (codeEl) {
    codeEl.textContent = 'Failed to load file content. Click the button below to view on GitHub.';
  }
}

/**
 * Open collection modal with item list
 */
async function openCollectionModal(
  filePath: string,
  title: HTMLElement,
  modalContent: HTMLElement,
  installDropdown: HTMLElement | null,
  copyBtn: HTMLElement | null,
  downloadBtn: HTMLElement | null
): Promise<void> {
  // Hide install dropdown and copy/download for collections
  if (installDropdown) installDropdown.style.display = 'none';
  if (copyBtn) copyBtn.style.display = 'none';
  if (downloadBtn) downloadBtn.style.display = 'none';

  // Show loading
  modalContent.innerHTML = '<div class="collection-loading">Loading collection...</div>';

  // Load collections data if not cached
  if (!collectionsCache) {
    collectionsCache = await fetchData<CollectionsData>('collections.json');
  }

  if (!collectionsCache) {
    modalContent.innerHTML = '<div class="collection-error">Failed to load collection data.</div>';
    return;
  }

  // Find the collection
  const collection = collectionsCache.items.find(c => c.path === filePath);
  if (!collection) {
    modalContent.innerHTML = '<div class="collection-error">Collection not found.</div>';
    return;
  }

  // Update title
  title.textContent = collection.name;

  // Render collection view
  modalContent.innerHTML = `
    <div class="collection-view">
      <div class="collection-description">${escapeHtml(collection.description || '')}</div>
      ${collection.tags && collection.tags.length > 0 ? `
        <div class="collection-tags">
          ${collection.tags.map(t => `<span class="resource-tag">${escapeHtml(t)}</span>`).join('')}
        </div>
      ` : ''}
      <div class="collection-items-header">
        <strong>${collection.items.length} items in this collection</strong>
      </div>
      <div class="collection-items-list">
        ${collection.items.map(item => `
          <div class="collection-item" data-path="${escapeHtml(item.path)}" data-type="${escapeHtml(item.kind)}">
            <span class="collection-item-icon">${getResourceIcon(item.kind)}</span>
            <div class="collection-item-info">
              <div class="collection-item-name">${escapeHtml(item.path.split('/').pop() || item.path)}</div>
              ${item.usage ? `<div class="collection-item-usage">${escapeHtml(item.usage)}</div>` : ''}
            </div>
            <span class="collection-item-type">${escapeHtml(item.kind)}</span>
          </div>
        `).join('')}
      </div>
    </div>
  `;

  // Add click handlers to collection items
  modalContent.querySelectorAll('.collection-item').forEach(el => {
    el.addEventListener('click', () => {
      const path = (el as HTMLElement).dataset.path;
      const itemType = (el as HTMLElement).dataset.type;
      if (path && itemType) {
        openFileModal(path, itemType);
      }
    });
  });
}

/**
 * Close modal
 * @param updateUrl - Whether to update the URL hash (default: true)
 */
export function closeModal(updateUrl = true): void {
  const modal = document.getElementById('file-modal');
  const installDropdown = document.getElementById('install-dropdown');
  
  if (modal) {
    modal.classList.add('hidden');
  }
  if (installDropdown) {
    installDropdown.classList.remove('open');
  }
  
  // Update URL for deep linking
  if (updateUrl) {
    updateHash(null);
  }
  
  currentFilePath = null;
  currentFileContent = null;
  currentFileType = null;
}

/**
 * Get current file path (for external use)
 */
export function getCurrentFilePath(): string | null {
  return currentFilePath;
}

/**
 * Get current file content (for external use)
 */
export function getCurrentFileContent(): string | null {
  return currentFileContent;
}