import React, { useState, useEffect } from 'react';
import { Brain, Users, Calendar, TrendingUp, X, User, Lock, Library, Download, LogIn, Eye, EyeOff } from 'lucide-react';
import { Link } from 'react-router-dom';
import apiClient from '../utils/apiClient';
import { buildApiUrl, API_ENDPOINTS } from '../config/api';
import './HomePage.css';

const HomePage = ({ onLogin }) => {
  const [showLoginModal, setShowLoginModal] = useState(false);
  const [loginForm, setLoginForm] = useState({ username: '', password: '' });
  const [loginError, setLoginError] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [rememberMe, setRememberMe] = useState(false);
  const [showPassword, setShowPassword] = useState(false);

  // 组件挂载时，从localStorage读取保存的用户名
  useEffect(() => {
    const savedUsername = localStorage.getItem('rememberedUsername');
    const isRemembered = localStorage.getItem('rememberMe') === 'true';

    if (savedUsername && isRemembered) {
      setLoginForm(prev => ({ ...prev, username: savedUsername }));
      setRememberMe(true);
    }
  }, []);

  const handleLogin = async (e) => {
    e.preventDefault();
    setIsLoading(true);
    setLoginError('');

    try {
      const loginResponse = await apiClient.post(buildApiUrl(API_ENDPOINTS.AUTH.LOGIN), loginForm);

      // 处理记住用户名
      if (rememberMe) {
        localStorage.setItem('rememberedUsername', loginForm.username);
        localStorage.setItem('rememberMe', 'true');
      } else {
        localStorage.removeItem('rememberedUsername');
        localStorage.removeItem('rememberMe');
      }

      onLogin(loginResponse.data);
      setShowLoginModal(false);
    } catch (error) {
      setLoginError(error.response?.data?.message || '登录失败,请重试');
    } finally {
      setIsLoading(false);
    }
  };

  const handleInputChange = (e) => {
    setLoginForm({
      ...loginForm,
      [e.target.name]: e.target.value
    });
  };

  const closeModal = () => {
    setShowLoginModal(false);
    setLoginForm({ username: '', password: '' });
    setLoginError('');
  };

  return (
    <div className="homepage">
      {/* Header */}
      <header className="homepage-header">
        <div className="header-content">
          <div className="logo">
            <Brain className="logo-icon" />
            <span className="logo-text">iMeeting</span>
          </div>
          <div className="header-actions">
            <Link to="/downloads" className="download-link">
              <Download size={18} />
              <span>下载客户端</span>
            </Link>
            <button
              className="login-btn"
              onClick={() => setShowLoginModal(true)}
            >
              <LogIn size={18} />
              <span>登录</span>
            </button>
          </div>
        </div>
      </header>

      {/* Hero Section */}
      <section className="hero">
        <div className="hero-content">
          <h1 className="hero-title">iMeeting - 灵 枢 (Líng Shū)</h1>
          <p className="hero-subtitle">
            让每一次谈话都产生价值
          </p>
          <button 
            className="cta-button"
            onClick={() => setShowLoginModal(true)}
          >
            开始使用
          </button>
        </div>
      </section>

      {/* Features Section */}
      <section className="features">
        <div className="features-container">
          <h2 className="features-title">核心功能</h2>
          <div className="features-grid">
            <div className="feature-card feature-card-1">
              <Brain className="feature-icon feature-icon-1" />
              <h3>AI智能转录</h3>
              <p>自动将会议音频转为文字，并识别不同发言人。</p>
            </div>
            <div className="feature-card feature-card-2">
              <TrendingUp className="feature-icon feature-icon-2" />
              <h3>智能摘要</h3>
              <p>AI自动生成会议摘要，提取关键信息和决策。</p>
            </div>
            <div className="feature-card feature-card-3">
              <Library className="feature-icon feature-icon-3" />
              <h3>交叉知识库</h3>
              <p>所有会议的摘要和内容汇聚成一个可供检索的知识库。</p>
            </div>
            <div className="feature-card feature-card-4">
              <Users className="feature-icon feature-icon-4" />
              <h3>参会人管理</h3>
              <p>轻松管理会议参与者，追踪会议参与情况。</p>
            </div>
            <div className="feature-card feature-card-5">
              <Calendar className="feature-icon feature-icon-5" />
              <h3>时间轴视图</h3>
              <p>按时间顺序展示所有会议，快速回顾历史记录。</p>
            </div>
            <div className="feature-card feature-card-6">
              <Download className="feature-icon feature-icon-6" />
              <h3>数据导出</h3>
              <p>导出会议摘要、脑图和转录内容，方便归档和分享。</p>
            </div>
          </div>
        </div>
      </section>

      {/* Footer */}
      <footer className="homepage-footer">
        <p>© 2025 紫光汇智信息技术有限公司. All rights reserved.</p>
        <p>备案号：渝ICP备2023007695号-11</p>
      </footer>

      {/* Login Modal */}
      {showLoginModal && (
        <div className="modal-overlay" onClick={closeModal}>
          <div className="login-modal" onClick={e => e.stopPropagation()}>
            <div className="modal-header">
              <h2>登录到iMeeting</h2>
              <button className="close-btn" onClick={closeModal}>
                <X size={20} />
              </button>
            </div>
            
            <form className="login-form" onSubmit={handleLogin}>
              <div className="form-group">
                <label htmlFor="username">
                  <User size={18} />
                  用户名
                </label>
                <input
                  type="text"
                  id="username"
                  name="username"
                  value={loginForm.username}
                  onChange={handleInputChange}
                  placeholder="请输入用户名"
                  required
                />
              </div>

              <div className="form-group password-group">
                <label htmlFor="password">
                  <Lock size={18} />
                  密码
                </label>
                <div className="password-input-wrapper">
                  <input
                    type={showPassword ? "text" : "password"}
                    id="password"
                    name="password"
                    value={loginForm.password}
                    onChange={handleInputChange}
                    placeholder="请输入密码"
                    required
                  />
                  <button
                    type="button"
                    className="password-toggle-btn"
                    onClick={() => setShowPassword(!showPassword)}
                    aria-label={showPassword ? "隐藏密码" : "显示密码"}
                  >
                    {showPassword ? <EyeOff size={18} /> : <Eye size={18} />}
                  </button>
                </div>
                <label htmlFor="rememberMe" className="remember-me-label">
                  <input
                    type="checkbox"
                    id="rememberMe"
                    checked={rememberMe}
                    onChange={(e) => setRememberMe(e.target.checked)}
                  />
                  <span>记住用户名</span>
                </label>
              </div>

              <div className="error-message-container">
                {loginError && (
                  <div className="error-message">{loginError}</div>
                )}
              </div>

              <button
                type="submit"
                className="submit-btn"
                disabled={isLoading}
              >
                {isLoading ? '登录中...' : '登录'}
              </button>
            </form>
          </div>
        </div>
      )}
    </div>
  );
};

export default HomePage;