import { useState, useRef, useEffect } from 'react'
import { BrowserRouter as Router, Route, Routes, Navigate, useNavigate, Link } from 'react-router-dom'
import { TbLayoutSidebarLeftCollapse, TbLayoutSidebarRightCollapse } from "react-icons/tb";
import { AiFillHome } from "react-icons/ai";
import { BiPodcast } from "react-icons/bi";
import { FaMicrophoneAlt } from "react-icons/fa";
import { MdDarkMode, MdLightMode } from "react-icons/md";
import { ImPodcast } from "react-icons/im";
import { RiChatVoiceAiFill } from "react-icons/ri";
import { FaUser, FaSignOutAlt } from "react-icons/fa";
import { PiGooglePodcastsLogo } from "react-icons/pi";
import { TiFlowSwitch } from "react-icons/ti";
import { SiNodemon } from "react-icons/si";
import React from 'react';

import Home from './pages/Home'
import Podcasts from './pages/Podcasts'
import Workflows from './pages/Workflows'
import Demo from './pages/Demo'
import WorkflowEditor from './components/WorkflowEditor'
import UserModal from './components/UserModal'
import Toast from './components/Toast'
import './App.css'

// Global toast context
export const ToastContext = React.createContext({
  toast: null,
  setToast: () => { }
});

function App() {
  const [isOpen, setIsOpen] = useState(false);
  const [isDark, setIsDark] = useState(true);
  const [isLogin, setIsLogin] = useState(true);
  const [isAuthenticated, setIsAuthenticated] = useState(false);
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [toast, setToast] = useState(null);
  const sidebarRef = useRef(null);

  // Check for token on initial load
  useEffect(() => {
    const token = localStorage.getItem('token');
    if (token) {
      // Validate token by making a request to the backend
      const validateToken = async () => {
        try {
          const response = await fetch('http://localhost:8000/user/me', {
            headers: {
              'Authorization': `Bearer ${token}`
            }
          });

          if (response.ok) {
            setIsAuthenticated(true);
            console.log('User authenticated from stored token');
          } else {
            // Token is invalid, remove it
            localStorage.removeItem('token');
            setIsAuthenticated(false);
            console.log('Stored token is invalid, removed');
          }
        } catch (error) {
          console.error('Error validating token:', error);
          // Don't remove token on network errors to allow offline access
        }
      };

      validateToken();
    }
  }, []);

  useEffect(() => {
    const handleClickOutside = (event) => {
      if (sidebarRef.current && !sidebarRef.current.contains(event.target)) {
        setIsOpen(false);
      }
    };

    document.addEventListener('mousedown', handleClickOutside);
    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, []);

  const toggleSidebar = () => {
    setIsOpen(!isOpen);
  };

  const toggleTheme = (e) => {
    e.preventDefault();
    setIsDark(!isDark);
    document.body.style.backgroundColor = !isDark ? '#040511' : '#ffffff';
    document.body.style.color = !isDark ? '#ffffff' : '#000000';
  };

  const toggleForm = () => {
    setIsLogin(!isLogin);
  };

  const handleLogout = () => {
    localStorage.removeItem('token');
    setIsAuthenticated(false);
    showToast('Logged out successfully', 'success');
  };

  const showToast = (message, type = 'success') => {
    setToast({ message, type });
  };

  const handleSubmit = async (e) => {
    e.preventDefault();
    const formData = new FormData(e.target);
    const username = formData.get('username');
    const password = formData.get('password');

    try {
      const response = await fetch(`http://localhost:8000/${isLogin ? 'login' : 'signup'}`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ username, password }),
      });

      if (response.ok) {
        const data = await response.json();
        localStorage.setItem('token', data.access_token);
        setIsAuthenticated(true);
        showToast(`Successfully ${isLogin ? 'logged in' : 'signed up'}!`, 'success');
      } else {
        const error = await response.json();
        showToast(error.detail, 'error');
      }
    } catch (error) {
      console.error('Error:', error);
      showToast('An error occurred during authentication', 'error');
    }
  };

  return (
    <ToastContext.Provider value={{ toast, setToast }}>
      <Router>
        <>
          <div className={`${isAuthenticated && 'simple-bg'}`}>
          </div>
          <div className={`app-container ${isDark ? 'dark' : 'light'} ${!isAuthenticated && isDark ? 'bg-login' : ''} `} >
            <nav ref={sidebarRef} className={`sidebar ${isOpen ? 'open' : 'closed'}`}>
              <div className='product-name'>
                <span><PiGooglePodcastsLogo /> PodCraft <sup>©</sup> <sub>Beta</sub></span>
              </div>
              <span className="toggle-btn" onClick={toggleSidebar}>
                {isOpen ? <TbLayoutSidebarLeftCollapse /> : <TbLayoutSidebarRightCollapse />}
              </span>

              <div className="nav-links">
                {isAuthenticated && (
                  <>
                    <Link to="/home" className="nav-link">
                      <AiFillHome />
                      <span className={`link-text ${!isOpen && 'hidden'}`}>Home</span>
                    </Link>

                    <Link to="/podcasts" className="nav-link">
                      <BiPodcast />
                      <span className={`link-text ${!isOpen && 'hidden'}`}>Podcasts</span>
                    </Link>

                    <Link to="/workflows" className="nav-link">
                      <TiFlowSwitch />
                      <span className={`link-text ${!isOpen && 'hidden'}`}>Workflows</span>
                    </Link>
                    
                    <Link to="/demo" className="nav-link">
                      <SiNodemon />
                      <span className={`link-text ${!isOpen && 'hidden'}`}>Demo</span>
                    </Link>

                    <div className="nav-divider"></div>

                    <a href="#" className="nav-link" onClick={() => setIsModalOpen(true)}>
                      <FaUser />
                      <span className={`link-text ${!isOpen && 'hidden'}`}>Profile</span>
                    </a>

                    <a href="#" className="nav-link" onClick={handleLogout}>
                      <FaSignOutAlt />
                      <span className={`link-text ${!isOpen && 'hidden'}`}>Logout</span>
                    </a>
                  </>
                )}

                <a href="#" className="nav-link theme-toggle" onClick={toggleTheme}>
                  {isDark ? <MdDarkMode /> : <MdLightMode />}
                  <span className={`link-text ${!isOpen && 'hidden'}`}>
                    {isDark ? 'Dark Mode' : 'Light Mode'}
                  </span>
                </a>
              </div>
            </nav>

            <main className={`main-content ${!isOpen ? 'expanded' : ''}`}>
              {!isAuthenticated ? (
                <div className="auth-container">
                  <div className="hero-section">
                    <div className="hero-content">
                      <div className="hero-logo">
                        <ImPodcast />
                        <h1>PodCraft</h1>
                      </div>
                      <p className="hero-tagline">One prompt <RiChatVoiceAiFill /> to Podcast <BiPodcast /></p>
                    </div>
                  </div>
                  <div className="auth-form-container">
                    <h2>{isLogin ? 'Login' : 'Sign Up'}</h2>
                    <form className="auth-form" onSubmit={handleSubmit}>
                      <div className="form-group">
                        <input type="text" name="username" placeholder="Username" required />
                      </div>
                      <div className="form-group">
                        <input type="password" name="password" placeholder="Password" required />
                      </div>
                      <button type="submit" className="submit-btn">
                        {isLogin ? 'Login' : 'Sign Up'}
                      </button>
                    </form>
                    <p className="form-switch">
                      {isLogin ? "Don't have an account? " : "Already have an account? "}
                      <a href="#" onClick={toggleForm}>
                        {isLogin ? 'Sign Up' : 'Login'}
                      </a>
                    </p>
                  </div>
                </div>
              ) : (
                <Routes>
                  <Route path="/home" element={<Home />} />
                  <Route path="/podcasts" element={<Podcasts />} />
                  <Route path="/workflows" element={<Workflows />} />
                  <Route path="/demo" element={<Demo />} />
                  <Route path="/workflows/workflow/:workflowId" element={<WorkflowEditor />} />
                  <Route path="/" element={<Navigate to="/home" replace />} />
                </Routes>
              )}
            </main>

            <UserModal
              isOpen={isModalOpen}
              onClose={() => setIsModalOpen(false)}
              token={localStorage.getItem('token')}
            />

            <div className="toast-container">
              {toast && (
                <Toast
                  message={toast.message}
                  type={toast.type}
                  onClose={() => setToast(null)}
                />
              )}
            </div>
          </div>
        </>
      </Router>
    </ToastContext.Provider>
  )
}

export default App