// SPA Router for LibrePortal - Handles navigation without page reloads
class Router {
  constructor() {
    this.routes = new Map();
    this.currentRoute = null;
    this.loadingBar = null;
    this.contentContainer = null;
    this.init();
  }

  init() {
    // Create loading bar
    this.createLoadingBar();
    
    // Get content container
    this.contentContainer = document.getElementById('main-content') || document.querySelector('.main');
    //console.log('Router: Content container found:', !!this.contentContainer, this.contentContainer);
    
    // Handle browser back/forward
    window.addEventListener('popstate', (e) => {
      if (e.state && e.state.route) {
        this.navigate(e.state.route, false);
      }
    });

    // Don't handle initial route here - let SPA handle it after routes are registered
    //console.log('Router: Initialized, waiting for SPA to handle initial navigation');
  }

  createLoadingBar() {
    // Create neon loading bar
    this.loadingBar = document.createElement('div');
    this.loadingBar.className = 'neon-loading-bar';
    this.loadingBar.innerHTML = `
      <div class="neon-loading-bar-inner">
        <div class="neon-loading-bar-progress"></div>
        <div class="neon-loading-bar-glow"></div>
      </div>
    `;
    
    // Insert after header
    const header = document.getElementById('topbar-container');
    if (header) {
      header.insertAdjacentElement('afterend', this.loadingBar);
    }

    // Add CSS
    this.addLoadingBarStyles();
  }

  addLoadingBarStyles() {
    const style = document.createElement('style');
    style.textContent = `
      .neon-loading-bar {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        height: 3px;
        background: rgba(0, 0, 0, 0.3);
        z-index: 1000;
        opacity: 0;
        transition: opacity 0.3s ease;
      }

      .neon-loading-bar.active {
        opacity: 1;
      }

      .neon-loading-bar-inner {
        position: relative;
        width: 100%;
        height: 100%;
        overflow: hidden;
      }

      .neon-loading-bar-progress {
        height: 100%;
        width: 0%;
        background: linear-gradient(90deg, #00d4ff, #0099ff, #00d4ff);
        transition: width 0.3s ease;
        box-shadow: 0 0 10px #00d4ff;
        animation: neonPulse 1.5s ease-in-out infinite;
      }

      .neon-loading-bar-glow {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 100%;
        background: linear-gradient(90deg, transparent, #00d4ff, transparent);
        opacity: 0.6;
        animation: neonGlow 2s ease-in-out infinite;
      }

      @keyframes neonPulse {
        0%, 100% { opacity: 1; }
        50% { opacity: 0.7; }
      }

      @keyframes neonGlow {
        0%, 100% { 
          opacity: 0.3;
          transform: scaleX(1);
        }
        50% { 
          opacity: 0.8;
          transform: scaleX(1.1);
        }
      }

      .neon-loading-bar.complete .neon-loading-bar-progress {
        width: 100%;
        animation: none;
      }

      .neon-loading-bar.complete .neon-loading-bar-glow {
        animation: none;
        opacity: 0;
      }
    `;
    document.head.appendChild(style);
  }

  // Register a route
  register(path, handler) {
    this.routes.set(path, handler);
    //console.log('Router: Registered route:', path);
  }

  // Navigate to a route
  async navigate(path, addToHistory = true) {
    if (this.currentRoute === path) return;

    // Show loading bar
    this.showLoadingBar();

    // Update browser history
    if (addToHistory) {
      history.pushState({ route: path }, '', path);
    }

    this.currentRoute = path;

    try {
      //console.log('Router: Navigating to:', path);
      //console.log('Router: Available routes:', Array.from(this.routes.keys()));
      
      // Find matching route - simple wildcard matching
      let handler = null;
      
      if (this.routes.has(path)) {
        // Exact match
        handler = this.routes.get(path);
      } else {
        // Wildcard matching
        for (const [route, routeHandler] of this.routes) {
          if (route.includes('*')) {
            const routePattern = route.replace('*', '');
            if (path.startsWith(routePattern)) {
              handler = routeHandler;
              break;
            }
          }
        }
      }
      
      if (handler) {
        //console.log('Router: Found handler for:', path);
        await handler();
      } else {
        console.warn('Router: No handler found for:', path);
        console.warn('Router: Available routes were:', Array.from(this.routes.keys()));
        this.hideLoadingBar();
      }
    } catch (error) {
      console.error('Navigation error:', error);
      this.hideLoadingBar();
    }
  }

  showLoadingBar() {
    if (this.loadingBar) {
      this.loadingBar.classList.add('active');
      // Reset progress
      const progress = this.loadingBar.querySelector('.neon-loading-bar-progress');
      if (progress) {
        progress.style.width = '0%';
      }
    }
  }

  updateProgress(percent) {
    if (this.loadingBar) {
      const progress = this.loadingBar.querySelector('.neon-loading-bar-progress');
      if (progress) {
        progress.style.width = `${percent}%`;
      }
    }
  }

  hideLoadingBar() {
    if (this.loadingBar) {
      // Complete animation
      this.updateProgress(100);
      
      setTimeout(() => {
        this.loadingBar.classList.add('complete');
        
        setTimeout(() => {
          this.loadingBar.classList.remove('active', 'complete');
          const progress = this.loadingBar.querySelector('.neon-loading-bar-progress');
          if (progress) {
            progress.style.width = '0%';
          }
        }, 300);
      }, 200);
    }
  }

  // Load content dynamically
  async loadContent(content, title = null) {
    //console.log('Router: Loading content with title:', title);
    if (!this.contentContainer) {
      console.error('Router: No content container found');
      return;
    }

    // Clear current content
    this.contentContainer.innerHTML = '';

    // Update page title
    if (title) {
      document.title = `${title} - LibrePortal`;
    }

    // Add new content
    this.contentContainer.innerHTML = content;
    //console.log('Router: Content loaded successfully, container innerHTML length:', this.contentContainer.innerHTML.length);

    // Update active nav state
    this.updateActiveNav();
  }

  updateActiveNav() {
    // Always clear all navigation first to prevent sticky highlighting
    if (typeof window.topbarNavigationHighlighting === 'function') {
      window.topbarNavigationHighlighting();
      return; // Exit early - let topbar handle it
    }
    
    // Fallback to original logic if helper not available
    // Remove active class from all nav items
    document.querySelectorAll('.nav-item').forEach(item => {
      item.classList.remove('active');
    });

    // Use path-based detection only for consistency
    const pathname = window.location.pathname;
    
    let activeNavId;
    
    // PRIMARY: Use path-based detection only (most reliable)
    if (pathname.startsWith('/app') || pathname.startsWith('/apps')) {
      activeNavId = 'nav-app-center';
    } else if (pathname.startsWith('/admin') || pathname.startsWith('/config') || pathname.startsWith('/ssh')) {
      activeNavId = 'nav-config';
    } else if (pathname.startsWith('/tasks')) {
      activeNavId = 'nav-tasks';
    } else if (pathname === '/' || pathname === '/dashboard') {
      activeNavId = 'nav-dashboard';
    } else {
      activeNavId = 'nav-dashboard'; // default
    }

    if (activeNavId) {
      const activeNav = document.getElementById(activeNavId);
      if (activeNav) {
        activeNav.classList.add('nav-active');
      }
    }
  }
}

// Global router instance
const router = new Router();