import React, { useState, useEffect } from 'react';
import { useParams, Link } from 'react-router-dom';
import { 
  Layout, Card, Typography, Space, Button, 
  Result, Spin, App, Tag, Divider, Empty, Input
} from 'antd';
import { 
  LockOutlined, EyeOutlined, EyeInvisibleOutlined, 
  CopyOutlined, CheckCircleOutlined, ShareAltOutlined,
  PlayCircleFilled, PauseCircleFilled,
  HomeOutlined, CalendarOutlined, LoginOutlined
} from '@ant-design/icons';
import apiClient from '../utils/apiClient';
import { buildApiUrl, API_ENDPOINTS } from '../config/api';
import MarkdownRenderer from '../components/MarkdownRenderer';
import BrandLogo from '../components/BrandLogo';
import tools from '../utils/tools';

const { Header, Content } = Layout;
const { Title, Text, Paragraph } = Typography;

const MeetingPreview = () => {
  const { meeting_id } = useParams();
  const { message } = App.useApp();
  const [meeting, setMeeting] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [password, setPassword] = useState('');
  const [passwordError, setPasswordError] = useState('');
  const [passwordRequired, setPasswordRequired] = useState(false);
  const [isAuthorized, setIsAuthorized] = useState(false);

  useEffect(() => {
    setMeeting(null);
    setError(null);
    setPassword('');
    setPasswordError('');
    setPasswordRequired(false);
    setIsAuthorized(false);
    fetchPreview();
  }, [meeting_id]);

  const fetchPreview = async (pwd = '') => {
    setLoading(true);
    try {
      const endpoint = API_ENDPOINTS.MEETINGS.PREVIEW_DATA(meeting_id);
      const url = buildApiUrl(`${endpoint}${pwd ? `?password=${encodeURIComponent(pwd)}` : ''}`);
      const res = await apiClient.get(url);
      setMeeting(res.data);
      setIsAuthorized(true);
      setPasswordRequired(false);
      setPasswordError('');
      setError(null);
    } catch (err) {
      const responseCode = String(err?.response?.data?.code || '');
      if (responseCode === '401') {
        setMeeting(null);
        setIsAuthorized(false);
        setPasswordRequired(true);
        setPasswordError(err?.response?.data?.message || '');
        setError(null);
      } else {
        setMeeting(null);
        setIsAuthorized(false);
        setPasswordRequired(false);
        setPasswordError('');
        setError(err?.response?.data?.message || '无法加载会议预览');
      }
    } finally {
      setLoading(false);
    }
  };

  const handleVerify = () => {
    if (!password) {
      message.warning('请输入访问密码');
      return;
    }
    fetchPreview(password);
  };

  if (loading && !meeting) return <div style={{ textAlign: 'center', padding: '100px' }}><Spin size="large" /></div>;

  if (error) return <Result status="error" title={error} extra={<Link to="/"><Button type="primary" icon={<HomeOutlined />}>返回首页</Button></Link>} />;

  if (passwordRequired && !isAuthorized) {
    return (
      <div style={{ minHeight: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center', background: '#f0f2f5' }}>
        <Card style={{ width: 400, borderRadius: 16, textAlign: 'center', boxShadow: '0 8px 24px rgba(0,0,0,0.05)' }}>
          <LockOutlined style={{ fontSize: 48, color: '#1677ff', marginBottom: 24 }} />
          <Title level={3}>此会议受密码保护</Title>
          <Paragraph type="secondary">请输入访问密码以查看会议纪要</Paragraph>
          <Space direction="vertical" style={{ width: '100%' }} size="large">
            <Input.Password 
              size="large" 
              placeholder="访问密码" 
              value={password} 
              status={passwordError ? 'error' : undefined}
              onChange={e => {
                setPassword(e.target.value);
                if (passwordError) {
                  setPasswordError('');
                }
              }} 
              onPressEnter={handleVerify}
            />
            {passwordError ? <Text type="danger">{passwordError}</Text> : null}
            <Button type="primary" size="large" block icon={<EyeOutlined />} onClick={handleVerify}>立即查看</Button>
          </Space>
          <div style={{ marginTop: 24 }}>
            <Link to="/"><Button type="link" icon={<HomeOutlined />}>返回首页</Button></Link>
          </div>
        </Card>
      </div>
    );
  }

  return (
    <Layout style={{ minHeight: '100vh', background: '#f0f2f5' }}>
      <Header style={{ background: '#fff', padding: '0 24px', display: 'flex', alignItems: 'center', justifyContent: 'space-between', boxShadow: '0 2px 8px rgba(0,0,0,0.05)' }}>
        <Space>
          <BrandLogo title="iMeeting 会议预览" size={28} titleSize={18} gap={10} />
        </Space>
        <Link to="/"><Button icon={<LoginOutlined />}>登录系统</Button></Link>
      </Header>
      
      <Content style={{ padding: '40px 20px', maxWidth: 900, margin: '0 auto', width: '100%' }}>
        <Card variant="borderless" style={{ borderRadius: 16 }}>
          <Title level={2}>{meeting.title}</Title>
          <Space wrap style={{ marginBottom: 20 }}>
            {meeting.tags?.map(t => <Tag key={t.id} color="blue">{t.name}</Tag>)}
            <Text type="secondary"><CalendarOutlined /> {tools.formatDateTime(meeting.meeting_time)}</Text>
          </Space>
          
          <Divider />
          
          <div className="preview-content">
            {meeting.summary ? (
              <MarkdownRenderer content={meeting.summary} />
            ) : (
              <Empty description="暂无会议总结内容" />
            )}
          </div>
        </Card>
      </Content>
    </Layout>
  );
};

export default MeetingPreview;