/**
 * TenderRadar Navigation Component
 * Shared navbar for all app pages (dashboard, profile, alerts)
 */

class NavBar {
  constructor() {
    this.navElement = null;
    this.isLoggedIn = isAuthenticated();
    this.userInfo = getUserInfo();
  }

  /**
   * Initialize and inject navbar into page
   */
  init() {
    this.createNavBar();
    this.attachEventListeners();
    this.highlightActivePage();
  }

  /**
   * Create navbar HTML structure
   */
  createNavBar() {
    const nav = document.createElement('nav');
    nav.className = 'app-navbar';
    nav.innerHTML = this.getNavBarHTML();
    
    // Insert at the top of body
    document.body.insertBefore(nav, document.body.firstChild);
    this.navElement = nav;
  }

  /**
   * Get navbar HTML based on auth state
   */
  getNavBarHTML() {
    if (this.isLoggedIn && this.userInfo) {
      return this.getAuthenticatedNavHTML();
    } else {
      return this.getUnauthenticatedNavHTML();
    }
  }

  /**
   * HTML for authenticated users
   */
  getAuthenticatedNavHTML() {
    const userEmail = this.userInfo.email || 'User';
    
    return `
      <header class="app-header">
        <div class="nav-container">
          <!-- Logo / Brand -->
          <div class="nav-brand">
            <a href="/dashboard.html" class="brand-link">
              <img src="/logo.png" alt="TenderRadar" class="nav-logo">
              <span class="brand-text">TenderRadar</span>
            </a>
          </div>

          <!-- Mobile Toggle -->
          <button class="mobile-menu-toggle" aria-label="Toggle menu">
            <span></span>
            <span></span>
            <span></span>
          </button>

          <!-- Main Navigation -->
          <div class="nav-menu-wrapper">
            <ul class="nav-menu">
              <li><a href="/dashboard.html" class="nav-link" data-page="dashboard">Dashboard</a></li>
              <li><a href="/tenders.html" class="nav-link" data-page="tenders">Tenders</a></li>
              <li><a href="/alerts.html" class="nav-link" data-page="alerts">Alerts</a></li>
              <li><a href="/profile.html" class="nav-link" data-page="profile">Profile</a></li>
            </ul>

            <!-- User Menu -->
            <div class="nav-user">
              <button class="user-menu-toggle" aria-label="User menu">
                <span class="user-avatar">${userEmail.charAt(0).toUpperCase()}</span>
                <span class="user-email">${userEmail}</span>
                <svg class="dropdown-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                  <polyline points="6 9 12 15 18 9"></polyline>
                </svg>
              </button>
              <div class="user-dropdown" style="display: none;">
                <a href="/profile.html" class="dropdown-link">Profile Settings</a>
                <button class="dropdown-link logout-btn">Logout</button>
              </div>
            </div>
          </div>
        </div>
      </header>
    `;
  }

  /**
   * HTML for unauthenticated users
   */
  getUnauthenticatedNavHTML() {
    return `
      <header class="app-header">
        <div class="nav-container">
          <!-- Logo / Brand -->
          <div class="nav-brand">
            <a href="/index.html" class="brand-link">
              <img src="/logo.png" alt="TenderRadar" class="nav-logo">
              <span class="brand-text">TenderRadar</span>
            </a>
          </div>

          <!-- Mobile Toggle -->
          <button class="mobile-menu-toggle" aria-label="Toggle menu">
            <span></span>
            <span></span>
            <span></span>
          </button>

          <!-- Auth Links -->
          <div class="nav-menu-wrapper">
            <div class="nav-auth">
              <a href="/login.html" class="btn btn-outline btn-sm">Login</a>
              <a href="/signup.html" class="btn btn-primary btn-sm">Sign Up</a>
            </div>
          </div>
        </div>
      </header>
    `;
  }

  /**
   * Attach event listeners to navbar
   */
  attachEventListeners() {
    if (!this.isLoggedIn) return;

    // Mobile menu toggle
    const mobileToggle = this.navElement.querySelector('.mobile-menu-toggle');
    const navWrapper = this.navElement.querySelector('.nav-menu-wrapper');
    
    mobileToggle.addEventListener('click', () => {
      navWrapper.classList.toggle('active');
      mobileToggle.classList.toggle('active');
    });

    // User menu dropdown
    const userToggle = this.navElement.querySelector('.user-menu-toggle');
    const userDropdown = this.navElement.querySelector('.user-dropdown');
    
    userToggle.addEventListener('click', (e) => {
      e.stopPropagation();
      userDropdown.style.display = 
        userDropdown.style.display === 'none' ? 'block' : 'none';
    });

    // Close dropdown when clicking elsewhere
    document.addEventListener('click', () => {
      userDropdown.style.display = 'none';
    });

    // Logout button
    const logoutBtn = this.navElement.querySelector('.logout-btn');
    logoutBtn.addEventListener('click', (e) => {
      e.preventDefault();
      logout();
    });

    // Close mobile menu when clicking a link
    const navLinks = this.navElement.querySelectorAll('.nav-link');
    navLinks.forEach(link => {
      link.addEventListener('click', () => {
        navWrapper.classList.remove('active');
        mobileToggle.classList.remove('active');
      });
    });
  }

  /**
   * Highlight the current page's nav link
   */
  highlightActivePage() {
    const currentPath = window.location.pathname;
    const navLinks = this.navElement.querySelectorAll('.nav-link');

    navLinks.forEach(link => {
      const href = link.getAttribute('href');
      if (currentPath.includes(href.replace('.html', ''))) {
        link.classList.add('active');
      } else {
        link.classList.remove('active');
      }
    });
  }
}

// Auto-initialize when DOM is ready
if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', () => {
    const navbar = new NavBar();
    navbar.init();
  });
} else {
  const navbar = new NavBar();
  navbar.init();
}