/**
 * NOSTR_LOGIN_LITE Modal UI
 * Minimal vanilla JS modal to replace Stencil/Tailwind component library
 */

class Modal {
  constructor(options = {}) {
    this.options = options;
    this.container = null;
    this.isVisible = false;
    this.currentScreen = null;
    this.isEmbedded = !!options.embedded;
    this.embeddedContainer = options.embedded;

    // Initialize modal container and styles
    this._initModal();
  }

  _initModal() {
    // Create modal container
    this.container = document.createElement('div');
    this.container.id = this.isEmbedded ? 'nl-modal-embedded' : 'nl-modal';
    
    if (this.isEmbedded) {
      // Embedded mode: inline positioning, no overlay
      this.container.style.cssText = `
        position: relative;
        display: none;
        font-family: var(--nl-font-family, 'Courier New', monospace);
        width: 100%;
      `;
    } else {
      // Modal mode: fixed overlay
      this.container.style.cssText = `
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.75);
        display: none;
        z-index: 10000;
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;
    }

    // Create modal content
    const modalContent = document.createElement('div');
    if (this.isEmbedded) {
      // Embedded content: no centering margin, full width
      modalContent.style.cssText = `
        position: relative;
        background: var(--nl-secondary-color);
        color: var(--nl-primary-color);
        width: 100%;
        border-radius: var(--nl-border-radius, 15px);
        border: var(--nl-border-width) solid var(--nl-primary-color);
        overflow: hidden;
      `;
    } else {
      // Modal content: centered with margin
      modalContent.style.cssText = `
        position: relative;
        background: var(--nl-secondary-color);
        color: var(--nl-primary-color);
        width: 90%;
        max-width: 400px;
        margin: 50px auto;
        border-radius: var(--nl-border-radius, 15px);
        border: var(--nl-border-width) solid var(--nl-primary-color);
        max-height: 600px;
        overflow: hidden;
      `;
    }

    // Header
    const modalHeader = document.createElement('div');
    modalHeader.style.cssText = `
      padding: 20px 24px 0 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      border-bottom: none;
    `;

    const modalTitle = document.createElement('h2');
    modalTitle.textContent = 'Nostr Login';
    modalTitle.style.cssText = `
      margin: 0;
      font-size: 24px;
      font-weight: 600;
      color: var(--nl-primary-color);
      font-family: var(--nl-font-family, 'Courier New', monospace);
    `;

    modalHeader.appendChild(modalTitle);
    
    // Only add close button for non-embedded modals
    // Embedded modals shouldn't have a close button because there's no way to reopen them
    if (!this.isEmbedded) {
      const closeButton = document.createElement('button');
      closeButton.innerHTML = '×';
      closeButton.onclick = () => this.close();
      closeButton.style.cssText = `
        background: var(--nl-secondary-color);
        border: var(--nl-border-width) solid var(--nl-primary-color);
        border-radius: var(--nl-border-radius);
        font-size: 28px;
        color: var(--nl-primary-color);
        cursor: pointer;
        padding: 0;
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;
      closeButton.onmouseover = () => {
        closeButton.style.borderColor = 'var(--nl-accent-color)';
        closeButton.style.background = 'var(--nl-secondary-color)';
      };
      closeButton.onmouseout = () => {
        closeButton.style.borderColor = 'var(--nl-primary-color)';
        closeButton.style.background = 'var(--nl-secondary-color)';
      };
      
      modalHeader.appendChild(closeButton);
    }

    // Body
    this.modalBody = document.createElement('div');
    this.modalBody.style.cssText = `
      padding: 24px;
      overflow-y: auto;
      max-height: 500px;
      background: transparent;
      font-family: var(--nl-font-family, 'Courier New', monospace);
    `;

    modalContent.appendChild(modalHeader);
    modalContent.appendChild(this.modalBody);
    this.container.appendChild(modalContent);

    // Add to appropriate parent
    if (this.isEmbedded && this.embeddedContainer) {
      // Append to specified container for embedding
      if (typeof this.embeddedContainer === 'string') {
        const targetElement = document.querySelector(this.embeddedContainer);
        if (targetElement) {
          targetElement.appendChild(this.container);
        } else {
          console.error('NOSTR_LOGIN_LITE: Embedded container not found:', this.embeddedContainer);
          document.body.appendChild(this.container);
        }
      } else if (this.embeddedContainer instanceof HTMLElement) {
        this.embeddedContainer.appendChild(this.container);
      } else {
        console.error('NOSTR_LOGIN_LITE: Invalid embedded container');
        document.body.appendChild(this.container);
      }
    } else {
      // Add to body for modal mode
      document.body.appendChild(this.container);
    }

    // Click outside to close (only for modal mode)
    if (!this.isEmbedded) {
      this.container.onclick = (e) => {
        if (e.target === this.container) {
          this.close();
        }
      };
    }

    // Update theme
    this.updateTheme();
  }

  updateTheme() {
    // The theme will automatically update through CSS custom properties
    // No manual styling needed - the CSS variables handle everything
  }

  open(opts = {}) {
    this.currentScreen = opts.startScreen;
    this.isVisible = true;
    this.container.style.display = 'block';

    // Render login options
    this._renderLoginOptions();
  }

  close() {
    this.isVisible = false;
    this.container.style.display = 'none';
    this.modalBody.innerHTML = '';
  }

  _renderLoginOptions() {
    this.modalBody.innerHTML = '';

    const options = [];

    // Extension option
    if (this.options?.methods?.extension !== false) {
      options.push({
        type: 'extension',
        title: 'Browser Extension',
        description: 'Use your browser extension',
        icon: '🔌'
      });
    }

    // Local key option
    if (this.options?.methods?.local !== false) {
      options.push({
        type: 'local',
        title: 'Local Key',
        description: 'Create or import your own key',
        icon: '🔑'
      });
    }

    // Nostr Connect option (check both 'connect' and 'remote' for compatibility)
    if (this.options?.methods?.connect !== false && this.options?.methods?.remote !== false) {
      options.push({
        type: 'connect',
        title: 'Nostr Connect',
        description: 'Connect with external signer',
        icon: '🌐'
      });
    }

    // Read-only option
    if (this.options?.methods?.readonly !== false) {
      options.push({
        type: 'readonly',
        title: 'Read Only',
        description: 'Browse without signing',
        icon: '👁️'
      });
    }

    // OTP/DM option
    if (this.options?.methods?.otp !== false) {
      options.push({
        type: 'otp',
        title: 'DM/OTP',
        description: 'Receive OTP via DM',
        icon: '📱'
      });
    }

    // Render each option
    options.forEach(option => {
      const button = document.createElement('button');
      button.onclick = () => this._handleOptionClick(option.type);
      button.style.cssText = `
        display: flex;
        align-items: center;
        width: 100%;
        padding: 16px;
        margin-bottom: 12px;
        background: var(--nl-secondary-color);
        color: var(--nl-primary-color);
        border: var(--nl-border-width) solid var(--nl-primary-color);
        border-radius: var(--nl-border-radius);
        cursor: pointer;
        transition: all 0.2s;
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;
      button.onmouseover = () => {
        button.style.borderColor = 'var(--nl-accent-color)';
        button.style.background = 'var(--nl-secondary-color)';
      };
      button.onmouseout = () => {
        button.style.borderColor = 'var(--nl-primary-color)';
        button.style.background = 'var(--nl-secondary-color)';
      };

      const iconDiv = document.createElement('div');
      // Replace emoji icons with text-based ones
      const iconMap = {
        '🔌': '[EXT]',
        '🔑': '[KEY]',
        '🌐': '[NET]',
        '👁️': '[VIEW]',
        '📱': '[SMS]'
      };
      iconDiv.textContent = iconMap[option.icon] || option.icon;
      iconDiv.style.cssText = `
        font-size: 16px;
        font-weight: bold;
        margin-right: 16px;
        width: 50px;
        text-align: center;
        color: var(--nl-primary-color);
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;

      const contentDiv = document.createElement('div');
      contentDiv.style.cssText = 'flex: 1; text-align: left;';

      const titleDiv = document.createElement('div');
      titleDiv.textContent = option.title;
      titleDiv.style.cssText = `
        font-weight: 600;
        margin-bottom: 4px;
        color: var(--nl-primary-color);
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;

      const descDiv = document.createElement('div');
      descDiv.textContent = option.description;
      descDiv.style.cssText = `
        font-size: 14px;
        color: #666666;
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;

      contentDiv.appendChild(titleDiv);
      contentDiv.appendChild(descDiv);

      button.appendChild(iconDiv);
      button.appendChild(contentDiv);
      this.modalBody.appendChild(button);
    });
  }

  _handleOptionClick(type) {
    console.log('Selected login type:', type);

    // Handle different login types
    switch (type) {
      case 'extension':
        this._handleExtension();
        break;
      case 'local':
        this._showLocalKeyScreen();
        break;
      case 'connect':
        this._showConnectScreen();
        break;
      case 'readonly':
        this._handleReadonly();
        break;
      case 'otp':
        this._showOtpScreen();
        break;
    }
  }

  _handleExtension() {
    // Detect all available real extensions
    const availableExtensions = this._detectAllExtensions();
    
    console.log(`Modal: Found ${availableExtensions.length} extensions:`, availableExtensions.map(e => e.displayName));
    
    if (availableExtensions.length === 0) {
      console.log('Modal: No real extensions found');
      this._showExtensionRequired();
    } else if (availableExtensions.length === 1) {
      // Single extension - use it directly without showing choice UI
      console.log('Modal: Single extension detected, using it directly:', availableExtensions[0].displayName);
      this._tryExtensionLogin(availableExtensions[0].extension);
    } else {
      // Multiple extensions - show choice UI
      console.log('Modal: Multiple extensions detected, showing choice UI for', availableExtensions.length, 'extensions');
      this._showExtensionChoice(availableExtensions);
    }
  }

  _detectAllExtensions() {
    const extensions = [];
    const seenExtensions = new Set(); // Track extensions by object reference to avoid duplicates
    
    // Extension locations to check (in priority order)
    const locations = [
      { path: 'window.navigator?.nostr', name: 'navigator.nostr', displayName: 'Standard Extension (navigator.nostr)', icon: '🌐', getter: () => window.navigator?.nostr },
      { path: 'window.webln?.nostr', name: 'webln.nostr', displayName: 'Alby WebLN Extension', icon: '⚡', getter: () => window.webln?.nostr },
      { path: 'window.alby?.nostr', name: 'alby.nostr', displayName: 'Alby Extension (Direct)', icon: '🐝', getter: () => window.alby?.nostr },
      { path: 'window.nos2x', name: 'nos2x', displayName: 'nos2x Extension', icon: '🔌', getter: () => window.nos2x },
      { path: 'window.flamingo?.nostr', name: 'flamingo.nostr', displayName: 'Flamingo Extension', icon: '🦩', getter: () => window.flamingo?.nostr },
      { path: 'window.mutiny?.nostr', name: 'mutiny.nostr', displayName: 'Mutiny Extension', icon: '⚔️', getter: () => window.mutiny?.nostr },
      { path: 'window.nostrich?.nostr', name: 'nostrich.nostr', displayName: 'Nostrich Extension', icon: '🐦', getter: () => window.nostrich?.nostr },
      { path: 'window.getAlby?.nostr', name: 'getAlby.nostr', displayName: 'getAlby Extension', icon: '🔧', getter: () => window.getAlby?.nostr }
    ];

    // Check each location
    for (const location of locations) {
      try {
        const obj = location.getter();
        
        console.log(`Modal: Checking ${location.name}:`, !!obj, obj?.constructor?.name);
        
        if (obj && this._isRealExtension(obj) && !seenExtensions.has(obj)) {
          extensions.push({
            name: location.name,
            displayName: location.displayName,
            icon: location.icon,
            extension: obj
          });
          seenExtensions.add(obj);
          console.log(`Modal: ✓ Detected extension at ${location.name} (${obj.constructor?.name})`);
        } else if (obj) {
          console.log(`Modal: ✗ Filtered out ${location.name} (${obj.constructor?.name})`);
        }
      } catch (e) {
        // Location doesn't exist or can't be accessed
        console.log(`Modal: ${location.name} not accessible:`, e.message);
      }
    }
    
    // Also check window.nostr but be extra careful to avoid our library
    console.log('Modal: Checking window.nostr:', !!window.nostr, window.nostr?.constructor?.name);
    if (window.nostr && this._isRealExtension(window.nostr) && !seenExtensions.has(window.nostr)) {
      extensions.push({
        name: 'window.nostr',
        displayName: 'Extension (window.nostr)',
        icon: '🔑',
        extension: window.nostr
      });
      seenExtensions.add(window.nostr);
      console.log(`Modal: ✓ Detected extension at window.nostr: ${window.nostr.constructor?.name}`);
    } else if (window.nostr) {
      console.log(`Modal: ✗ Filtered out window.nostr (${window.nostr.constructor?.name}) - likely our library`);
    }
    
    return extensions;
  }

  _isRealExtension(obj) {
    console.log(`Modal: EXTENSIVE DEBUG - _isRealExtension called with:`, obj);
    console.log(`Modal: Object type: ${typeof obj}`);
    console.log(`Modal: Object truthy: ${!!obj}`);
    
    if (!obj || typeof obj !== 'object') {
      console.log(`Modal: REJECT - Not an object`);
      return false;
    }
    
    console.log(`Modal: getPublicKey type: ${typeof obj.getPublicKey}`);
    console.log(`Modal: signEvent type: ${typeof obj.signEvent}`);
    
    // Must have required Nostr methods
    if (typeof obj.getPublicKey !== 'function' || typeof obj.signEvent !== 'function') {
      console.log(`Modal: REJECT - Missing required methods`);
      return false;
    }

    // Exclude NostrTools library object
    if (obj === window.NostrTools) {
      console.log(`Modal: REJECT - Is NostrTools object`);
      return false;
    }

    // Use the EXACT SAME logic as the comprehensive test (lines 804-809)
    // This is the key fix - match the comprehensive test's successful detection logic
    const constructorName = obj.constructor?.name;
    const objectKeys = Object.keys(obj);
    
    console.log(`Modal: Constructor name: "${constructorName}"`);
    console.log(`Modal: Object keys: [${objectKeys.join(', ')}]`);
    
    // COMPREHENSIVE TEST LOGIC - Accept anything with required methods that's not our specific library classes
    const isRealExtension = (
      typeof obj.getPublicKey === 'function' &&
      typeof obj.signEvent === 'function' &&
      constructorName !== 'WindowNostr' && // Our library class
      constructorName !== 'NostrLite' // Our main class
    );
    
    console.log(`Modal: Using comprehensive test logic:`);
    console.log(`  Has getPublicKey: ${typeof obj.getPublicKey === 'function'}`);
    console.log(`  Has signEvent: ${typeof obj.signEvent === 'function'}`);
    console.log(`  Not WindowNostr: ${constructorName !== 'WindowNostr'}`);
    console.log(`  Not NostrLite: ${constructorName !== 'NostrLite'}`);
    console.log(`  Constructor: "${constructorName}"`);
    
    // Additional debugging for comparison
    const extensionPropChecks = {
      _isEnabled: !!obj._isEnabled,
      enabled: !!obj.enabled,
      kind: !!obj.kind,
      _eventEmitter: !!obj._eventEmitter,
      _scope: !!obj._scope,
      _requests: !!obj._requests,
      _pubkey: !!obj._pubkey,
      name: !!obj.name,
      version: !!obj.version,
      description: !!obj.description
    };
    
    console.log(`Modal: Extension property analysis:`, extensionPropChecks);
    
    const hasExtensionProps = !!(
      obj._isEnabled || obj.enabled || obj.kind ||
      obj._eventEmitter || obj._scope || obj._requests || obj._pubkey ||
      obj.name || obj.version || obj.description
    );
    
    const underscoreKeys = objectKeys.filter(key => key.startsWith('_'));
    const hexToUint8Keys = objectKeys.filter(key => key.startsWith('_hex'));
    console.log(`Modal: Underscore keys: [${underscoreKeys.join(', ')}]`);
    console.log(`Modal: _hex* keys: [${hexToUint8Keys.join(', ')}]`);
    
    console.log(`Modal: Additional analysis:`);
    console.log(`  hasExtensionProps: ${hasExtensionProps}`);
    console.log(`  hasLibraryMethod (_hexToUint8Array): ${objectKeys.includes('_hexToUint8Array')}`);
    
    console.log(`Modal: COMPREHENSIVE TEST LOGIC RESULT: ${isRealExtension ? 'ACCEPT' : 'REJECT'}`);
    console.log(`Modal: FINAL DECISION for ${constructorName}: ${isRealExtension ? 'ACCEPT' : 'REJECT'}`);
    
    return isRealExtension;
  }

  _showExtensionChoice(extensions) {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = 'Choose Browser Extension';
    title.style.cssText = `
      margin: 0 0 16px 0;
      font-size: 18px;
      font-weight: 600;
      color: var(--nl-primary-color);
      font-family: var(--nl-font-family, 'Courier New', monospace);
    `;

    const description = document.createElement('p');
    description.textContent = `Found ${extensions.length} Nostr extensions. Choose which one to use:`;
    description.style.cssText = `
      margin-bottom: 20px;
      color: #666666;
      font-size: 14px;
      font-family: var(--nl-font-family, 'Courier New', monospace);
    `;

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(description);

    // Create button for each extension
    extensions.forEach((ext, index) => {
      const button = document.createElement('button');
      button.onclick = () => this._tryExtensionLogin(ext.extension);
      button.style.cssText = `
        display: flex;
        align-items: center;
        width: 100%;
        padding: 16px;
        margin-bottom: 12px;
        background: var(--nl-secondary-color);
        color: var(--nl-primary-color);
        border: var(--nl-border-width) solid var(--nl-primary-color);
        border-radius: var(--nl-border-radius);
        cursor: pointer;
        transition: all 0.2s;
        text-align: left;
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;
      
      button.onmouseover = () => {
        button.style.borderColor = 'var(--nl-accent-color)';
        button.style.background = 'var(--nl-secondary-color)';
      };
      button.onmouseout = () => {
        button.style.borderColor = 'var(--nl-primary-color)';
        button.style.background = 'var(--nl-secondary-color)';
      };

      const iconDiv = document.createElement('div');
      iconDiv.textContent = ext.icon;
      iconDiv.style.cssText = `
        font-size: 24px;
        margin-right: 16px;
        width: 24px;
        text-align: center;
      `;

      const contentDiv = document.createElement('div');
      contentDiv.style.cssText = 'flex: 1;';

      const nameDiv = document.createElement('div');
      nameDiv.textContent = ext.displayName;
      nameDiv.style.cssText = `
        font-weight: 600;
        margin-bottom: 4px;
        color: var(--nl-primary-color);
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;

      const pathDiv = document.createElement('div');
      pathDiv.textContent = ext.name;
      pathDiv.style.cssText = `
        font-size: 12px;
        color: #666666;
        font-family: var(--nl-font-family, 'Courier New', monospace);
      `;

      contentDiv.appendChild(nameDiv);
      contentDiv.appendChild(pathDiv);
      
      button.appendChild(iconDiv);
      button.appendChild(contentDiv);
      this.modalBody.appendChild(button);
    });

    // Add back button
    const backButton = document.createElement('button');
    backButton.textContent = 'Back to Login Options';
    backButton.onclick = () => this._renderLoginOptions();
    backButton.style.cssText = this._getButtonStyle('secondary') + 'margin-top: 20px;';
    
    this.modalBody.appendChild(backButton);
  }

  async _tryExtensionLogin(extensionObj) {
    try {
      // Show loading state
      this.modalBody.innerHTML = '<div style="text-align: center; padding: 20px;">🔄 Connecting to extension...</div>';
      
      // Get pubkey from extension
      const pubkey = await extensionObj.getPublicKey();
      console.log('Extension provided pubkey:', pubkey);
      
      // Set extension method with the extension object
      this._setAuthMethod('extension', { pubkey, extension: extensionObj });
      
    } catch (error) {
      console.error('Extension login failed:', error);
      this._showError(`Extension login failed: ${error.message}`);
    }
  }

  _showLocalKeyScreen() {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = 'Local Key';
    title.style.cssText = 'margin: 0 0 20px 0; font-size: 18px; font-weight: 600;';

    const createButton = document.createElement('button');
    createButton.textContent = 'Create New Key';
    createButton.onclick = () => this._createLocalKey();
    createButton.style.cssText = this._getButtonStyle();

    const importButton = document.createElement('button');
    importButton.textContent = 'Import Existing Key';
    importButton.onclick = () => this._showImportKeyForm();
    importButton.style.cssText = this._getButtonStyle() + 'margin-top: 12px;';

    const backButton = document.createElement('button');
    backButton.textContent = 'Back';
    backButton.onclick = () => this._renderLoginOptions();
    backButton.style.cssText = `
      display: block;
      margin-top: 20px;
      padding: 12px;
      background: #6b7280;
      color: white;
      border: none;
      border-radius: 6px;
      cursor: pointer;
    `;

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(createButton);
    this.modalBody.appendChild(importButton);
    this.modalBody.appendChild(backButton);
  }

  _createLocalKey() {
    try {
      const sk = window.NostrTools.generateSecretKey();
      const pk = window.NostrTools.getPublicKey(sk);
      const nsec = window.NostrTools.nip19.nsecEncode(sk);
      const npub = window.NostrTools.nip19.npubEncode(pk);

      this._showKeyDisplay(pk, nsec, 'created');
    } catch (error) {
      this._showError('Failed to create key: ' + error.message);
    }
  }

  _showImportKeyForm() {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = 'Import Local Key';
    title.style.cssText = 'margin: 0 0 16px 0; font-size: 18px; font-weight: 600;';

    const description = document.createElement('p');
    description.textContent = 'Enter your secret key in either nsec or hex format:';
    description.style.cssText = 'margin-bottom: 12px; color: #6b7280; font-size: 14px;';

    const textarea = document.createElement('textarea');
    textarea.placeholder = 'Enter your secret key:\n• nsec1... (bech32 format)\n• 64-character hex string';
    textarea.style.cssText = `
      width: 100%;
      height: 100px;
      padding: 12px;
      border: 1px solid #d1d5db;
      border-radius: 6px;
      margin-bottom: 12px;
      resize: none;
      font-family: monospace;
      font-size: 14px;
      box-sizing: border-box;
    `;

    // Add real-time format detection
    const formatHint = document.createElement('div');
    formatHint.style.cssText = 'margin-bottom: 16px; font-size: 12px; color: #6b7280; min-height: 16px;';
    
    textarea.oninput = () => {
      const value = textarea.value.trim();
      if (!value) {
        formatHint.textContent = '';
        return;
      }
      
      const format = this._detectKeyFormat(value);
      if (format === 'nsec') {
        formatHint.textContent = '✅ Valid nsec format detected';
        formatHint.style.color = '#059669';
      } else if (format === 'hex') {
        formatHint.textContent = '✅ Valid hex format detected';
        formatHint.style.color = '#059669';
      } else {
        formatHint.textContent = '❌ Invalid key format - must be nsec1... or 64-character hex';
        formatHint.style.color = '#dc2626';
      }
    };

    const importButton = document.createElement('button');
    importButton.textContent = 'Import Key';
    importButton.onclick = () => this._importLocalKey(textarea.value);
    importButton.style.cssText = this._getButtonStyle();

    const backButton = document.createElement('button');
    backButton.textContent = 'Back';
    backButton.onclick = () => this._showLocalKeyScreen();
    backButton.style.cssText = this._getButtonStyle('secondary') + 'margin-top: 12px;';

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(description);
    this.modalBody.appendChild(textarea);
    this.modalBody.appendChild(formatHint);
    this.modalBody.appendChild(importButton);
    this.modalBody.appendChild(backButton);
  }

  _detectKeyFormat(keyValue) {
    const trimmed = keyValue.trim();
    
    // Check for nsec format
    if (trimmed.startsWith('nsec1') && trimmed.length === 63) {
      try {
        window.NostrTools.nip19.decode(trimmed);
        return 'nsec';
      } catch {
        return 'invalid';
      }
    }
    
    // Check for hex format (64 characters, valid hex)
    if (trimmed.length === 64 && /^[a-fA-F0-9]{64}$/.test(trimmed)) {
      return 'hex';
    }
    
    return 'invalid';
  }

  _importLocalKey(keyValue) {
    try {
      const trimmed = keyValue.trim();
      if (!trimmed) {
        throw new Error('Please enter a secret key');
      }

      const format = this._detectKeyFormat(trimmed);
      let sk;

      if (format === 'nsec') {
        // Decode nsec format - this returns Uint8Array
        const decoded = window.NostrTools.nip19.decode(trimmed);
        if (decoded.type !== 'nsec') {
          throw new Error('Invalid nsec format');
        }
        sk = decoded.data; // This is already Uint8Array
      } else if (format === 'hex') {
        // Convert hex string to Uint8Array
        sk = this._hexToUint8Array(trimmed);
        // Test that it's a valid secret key by trying to get public key
        window.NostrTools.getPublicKey(sk);
      } else {
        throw new Error('Invalid key format. Please enter either nsec1... or 64-character hex string');
      }

      // Generate public key and encoded formats
      const pk = window.NostrTools.getPublicKey(sk);
      const nsec = window.NostrTools.nip19.nsecEncode(sk);
      const npub = window.NostrTools.nip19.npubEncode(pk);

      this._showKeyDisplay(pk, nsec, 'imported');
    } catch (error) {
      this._showError('Invalid key: ' + error.message);
    }
  }

  _hexToUint8Array(hex) {
    // Convert hex string to Uint8Array
    if (hex.length % 2 !== 0) {
      throw new Error('Invalid hex string length');
    }
    const bytes = new Uint8Array(hex.length / 2);
    for (let i = 0; i < bytes.length; i++) {
      bytes[i] = parseInt(hex.substr(i * 2, 2), 16);
    }
    return bytes;
  }

  _showKeyDisplay(pubkey, nsec, action) {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = `Key ${action} successfully!`;
    title.style.cssText = 'margin: 0 0 16px 0; font-size: 18px; font-weight: 600; color: #059669;';

    const warningDiv = document.createElement('div');
    warningDiv.textContent = '⚠️ Save your secret key securely!';
    warningDiv.style.cssText = 'background: #fef3c7; color: #92400e; padding: 12px; border-radius: 6px; margin-bottom: 16px; font-size: 14px;';

    const nsecDiv = document.createElement('div');
    nsecDiv.innerHTML = `<strong>Your Secret Key:</strong><br><code style="word-break: break-all; background: #f3f4f6; padding: 8px; border-radius: 4px;">${nsec}</code>`;
    nsecDiv.style.cssText = 'margin-bottom: 16px; font-size: 14px;';

    const npubDiv = document.createElement('div');
    npubDiv.innerHTML = `<strong>Your Public Key:</strong><br><code style="word-break: break-all; background: #f3f4f6; padding: 8px; border-radius: 4px;">${window.NostrTools.nip19.npubEncode(pubkey)}</code>`;
    npubDiv.style.cssText = 'margin-bottom: 16px; font-size: 14px;';

    const continueButton = document.createElement('button');
    continueButton.textContent = 'Continue';
    continueButton.onclick = () => this._setAuthMethod('local', { secret: nsec, pubkey });
    continueButton.style.cssText = this._getButtonStyle();

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(warningDiv);
    this.modalBody.appendChild(nsecDiv);
    this.modalBody.appendChild(npubDiv);
    this.modalBody.appendChild(continueButton);
  }

  _setAuthMethod(method, options = {}) {
    // Emit auth method selection
    const event = new CustomEvent('nlMethodSelected', {
      detail: { method, ...options }
    });
    window.dispatchEvent(event);

    this.close();
  }

  _showError(message) {
    this.modalBody.innerHTML = '';

    const errorDiv = document.createElement('div');
    errorDiv.style.cssText = 'background: #fee2e2; color: #dc2626; padding: 16px; border-radius: 6px; margin-bottom: 16px;';
    errorDiv.innerHTML = `<strong>Error:</strong> ${message}`;

    const backButton = document.createElement('button');
    backButton.textContent = 'Back';
    backButton.onclick = () => this._renderLoginOptions();
    backButton.style.cssText = this._getButtonStyle('secondary');

    this.modalBody.appendChild(errorDiv);
    this.modalBody.appendChild(backButton);
  }

  _showExtensionRequired() {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = 'Browser Extension Required';
    title.style.cssText = 'margin: 0 0 16px 0; font-size: 18px; font-weight: 600;';

    const message = document.createElement('p');
    message.textContent = 'Please install a Nostr browser extension like Alby or getflattr and refresh the page.';
    message.style.cssText = 'margin-bottom: 20px; color: #6b7280;';

    const backButton = document.createElement('button');
    backButton.textContent = 'Back';
    backButton.onclick = () => this._renderLoginOptions();
    backButton.style.cssText = this._getButtonStyle('secondary');

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(message);
    this.modalBody.appendChild(backButton);
  }

  _showConnectScreen() {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = 'Connect to NIP-46 Remote Signer';
    title.style.cssText = 'margin: 0 0 16px 0; font-size: 18px; font-weight: 600;';

    const description = document.createElement('p');
    description.textContent = 'Connect to a remote signer (bunker) server to use its keys for signing.';
    description.style.cssText = 'margin-bottom: 20px; color: #6b7280; font-size: 14px;';

    const formGroup = document.createElement('div');
    formGroup.style.cssText = 'margin-bottom: 20px;';

    const label = document.createElement('label');
    label.textContent = 'Bunker Public Key:';
    label.style.cssText = 'display: block; margin-bottom: 8px; font-weight: 500;';

    const pubkeyInput = document.createElement('input');
    pubkeyInput.type = 'text';
    pubkeyInput.placeholder = 'bunker://pubkey?relay=..., bunker:hex, hex, or npub...';
    pubkeyInput.style.cssText = `
      width: 100%;
      padding: 12px;
      border: 1px solid #d1d5db;
      border-radius: 6px;
      margin-bottom: 12px;
      font-family: monospace;
      box-sizing: border-box;
    `;

    const urlLabel = document.createElement('label');
    urlLabel.textContent = 'Remote URL (optional):';
    urlLabel.style.cssText = 'display: block; margin-bottom: 8px; font-weight: 500;';

    const urlInput = document.createElement('input');
    urlInput.type = 'url';
    urlInput.placeholder = 'ws://localhost:8080 (default)';
    urlInput.style.cssText = `
      width: 100%;
      padding: 12px;
      border: 1px solid #d1d5db;
      border-radius: 6px;
      margin-bottom: 16px;
      box-sizing: border-box;
    `;

    // Users will enter the bunker URL manually from their bunker setup

    const connectButton = document.createElement('button');
    connectButton.textContent = 'Connect to Bunker';
    connectButton.onclick = () => this._handleNip46Connect(pubkeyInput.value, urlInput.value);
    connectButton.style.cssText = this._getButtonStyle();

    const backButton = document.createElement('button');
    backButton.textContent = 'Back';
    backButton.onclick = () => this._renderLoginOptions();
    backButton.style.cssText = this._getButtonStyle('secondary') + 'margin-top: 12px;';

    formGroup.appendChild(label);
    formGroup.appendChild(pubkeyInput);
    formGroup.appendChild(urlLabel);
    formGroup.appendChild(urlInput);

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(description);
    this.modalBody.appendChild(formGroup);
    this.modalBody.appendChild(connectButton);
    this.modalBody.appendChild(backButton);
  }

  _handleNip46Connect(bunkerPubkey, bunkerUrl) {
    if (!bunkerPubkey || !bunkerPubkey.length) {
      this._showError('Bunker pubkey is required');
      return;
    }

    this._showNip46Connecting(bunkerPubkey, bunkerUrl);
    this._performNip46Connect(bunkerPubkey, bunkerUrl);
  }

  _showNip46Connecting(bunkerPubkey, bunkerUrl) {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = 'Connecting to Remote Signer...';
    title.style.cssText = 'margin: 0 0 16px 0; font-size: 18px; font-weight: 600; color: #059669;';

    const description = document.createElement('p');
    description.textContent = 'Establishing secure connection to your remote signer.';
    description.style.cssText = 'margin-bottom: 20px; color: #6b7280;';

    // Normalize bunker pubkey for display (= show original format if bunker: prefix)
    const displayPubkey = bunkerPubkey.startsWith('bunker:') || bunkerPubkey.startsWith('npub') || bunkerPubkey.length === 64 ? bunkerPubkey : bunkerPubkey;

    const bunkerInfo = document.createElement('div');
    bunkerInfo.style.cssText = 'background: #f1f5f9; padding: 12px; border-radius: 6px; margin-bottom: 20px; font-size: 14px;';
    bunkerInfo.innerHTML = `
      <strong>Connecting to bunker:</strong><br>
      Pubkey: <code style="word-break: break-all;">${displayPubkey}</code><br>
      Relay: <code style="word-break: break-all;">${bunkerUrl || 'ws://localhost:8080'}</code><br>
      <small style="color: #6b7280;">If this relay is offline, the bunker server may be unavailable.</small>
    `;

    const connectingDiv = document.createElement('div');
    connectingDiv.style.cssText = 'text-align: center; color: #6b7280;';
    connectingDiv.innerHTML = `
      <div style="font-size: 24px; margin-bottom: 10px;">⏳</div>
      <div>Please wait while we establish the connection...</div>
      <div style="font-size: 12px; margin-top: 10px;">This may take a few seconds</div>
    `;

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(description);
    this.modalBody.appendChild(bunkerInfo);
    this.modalBody.appendChild(connectingDiv);
  }

  async _performNip46Connect(bunkerPubkey, bunkerUrl) {
    try {
      console.log('Starting NIP-46 connection to bunker:', bunkerPubkey, bunkerUrl);

      // Check if nostr-tools NIP-46 is available
      if (!window.NostrTools?.nip46) {
        throw new Error('nostr-tools NIP-46 module not available');
      }

      // Use nostr-tools to parse bunker input - this handles all formats correctly
      console.log('Parsing bunker input with nostr-tools...');
      const bunkerPointer = await window.NostrTools.nip46.parseBunkerInput(bunkerPubkey);

      if (!bunkerPointer) {
        throw new Error('Unable to parse bunker connection string or resolve NIP-05 identifier');
      }

      console.log('Parsed bunker pointer:', bunkerPointer);

      // Create local client keypair for this session
      const localSecretKey = window.NostrTools.generateSecretKey();
      console.log('Generated local client keypair for NIP-46 session');

      // Use nostr-tools BunkerSigner constructor
      console.log('Creating nip46 BunkerSigner...');
      const signer = new window.NostrTools.nip46.BunkerSigner(localSecretKey, bunkerPointer, {
        onauth: (url) => {
          console.log('Received auth URL from bunker:', url);
          // Open auth URL in popup or redirect
          window.open(url, '_blank', 'width=600,height=800');
        }
      });

      console.log('NIP-46 BunkerSigner created successfully');

      // Skip ping test - NIP-46 works through relays, not direct connection
      // Try to connect directly (this may trigger auth flow)
      console.log('Attempting NIP-46 connect...');
      await signer.connect();
      console.log('NIP-46 connect successful');

      // Get the user's public key from the bunker
      console.log('Getting public key from bunker...');
      const userPubkey = await signer.getPublicKey();
      console.log('NIP-46 user public key:', userPubkey);

      // Store the NIP-46 authentication info
      const nip46Info = {
        pubkey: userPubkey,
        signer: {
          method: 'nip46',
          remotePubkey: bunkerPointer.pubkey,
          bunkerSigner: signer,
          secret: bunkerPointer.secret,
          relays: bunkerPointer.relays
        }
      };

      console.log('NOSTR_LOGIN_LITE NIP-46 connection established successfully!');

      // Set as current auth method
      this._setAuthMethod('nip46', nip46Info);
      return;

    } catch (error) {
      console.error('NIP-46 connection failed:', error);
      this._showNip46Error(error.message);
    }
  }

  _showNip46Error(message) {
    this.modalBody.innerHTML = '';

    const title = document.createElement('h3');
    title.textContent = 'Connection Failed';
    title.style.cssText = 'margin: 0 0 16px 0; font-size: 18px; font-weight: 600; color: #dc2626;';

    const errorMsg = document.createElement('p');
    errorMsg.textContent = `Unable to connect to remote signer: ${message}`;
    errorMsg.style.cssText = 'margin-bottom: 20px; color: #6b7280;';

    const retryButton = document.createElement('button');
    retryButton.textContent = 'Try Again';
    retryButton.onclick = () => this._showConnectScreen();
    retryButton.style.cssText = this._getButtonStyle();

    const backButton = document.createElement('button');
    backButton.textContent = 'Back to Options';
    backButton.onclick = () => this._renderLoginOptions();
    backButton.style.cssText = this._getButtonStyle('secondary') + 'margin-top: 12px;';

    this.modalBody.appendChild(title);
    this.modalBody.appendChild(errorMsg);
    this.modalBody.appendChild(retryButton);
    this.modalBody.appendChild(backButton);
  }

  _handleReadonly() {
    // Set read-only mode
    this._setAuthMethod('readonly');
  }

  _showOtpScreen() {
    // Placeholder for OTP functionality
    this._showError('OTP/DM not yet implemented - coming soon!');
  }

  _getButtonStyle(type = 'primary') {
    const baseStyle = `
      display: block;
      width: 100%;
      padding: 12px;
      border: var(--nl-border-width) solid var(--nl-primary-color);
      border-radius: var(--nl-border-radius);
      font-size: 16px;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.2s;
      font-family: var(--nl-font-family, 'Courier New', monospace);
    `;

    if (type === 'primary') {
      return baseStyle + `
        background: var(--nl-secondary-color);
        color: var(--nl-primary-color);
      `;
    } else {
      return baseStyle + `
        background: #cccccc;
        color: var(--nl-primary-color);
      `;
    }
  }

  // Public API
  static init(options) {
    if (Modal.instance) return Modal.instance;
    Modal.instance = new Modal(options);
    return Modal.instance;
  }

  static getInstance() {
    return Modal.instance;
  }
}

// Initialize global instance
let modalInstance = null;

window.addEventListener('load', () => {
  modalInstance = new Modal();
});