import React, { useState, useEffect, useRef } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import {
  Card,
  Row,
  Col,
  Typography,
  Tag,
  Space,
  Divider,
  Button,
  Skeleton,
  Empty,
  List,
  Avatar,
  Breadcrumb,
  Popover,
  Input,
  Select,
  message,
  Drawer,
  Form,
  Modal,
  Progress,
} from 'antd';
import {
  LeftOutlined,
  UserOutlined,
  ClockCircleOutlined,
  AudioOutlined,
  RobotOutlined,
  LoadingOutlined,
  EditOutlined,
  SyncOutlined,
  DownloadOutlined,
} from '@ant-design/icons';
import ReactMarkdown from 'react-markdown';
import dayjs from 'dayjs';
import {
  getMeetingDetail,
  getTranscripts,
  updateSpeakerInfo,
  reSummary,
  updateMeeting,
  MeetingVO,
  MeetingTranscriptVO,
  getMeetingProgress,
  MeetingProgress,
  downloadMeetingSummary,
} from '../../api/business/meeting';
import { getAiModelPage, getAiModelDefault, AiModelVO } from '../../api/business/aimodel';
import { getPromptPage, PromptTemplateVO } from '../../api/business/prompt';
import { useDict } from '../../hooks/useDict';
import { listUsers } from '../../api';
import { SysUser } from '../../types';

const { Title, Text } = Typography;
const { Option } = Select;

const MeetingProgressDisplay: React.FC<{ meetingId: number; onComplete: () => void }> = ({ meetingId, onComplete }) => {
  const [progress, setProgress] = useState<MeetingProgress | null>(null);

  useEffect(() => {
    const fetchProgress = async () => {
      try {
        const res = await getMeetingProgress(meetingId);
        if (res.data?.data) {
          setProgress(res.data.data);
          if (res.data.data.percent === 100) {
            onComplete();
          }
        }
      } catch (err) {
        // ignore polling errors
      }
    };

    fetchProgress();
    const timer = setInterval(fetchProgress, 3000);
    return () => clearInterval(timer);
  }, [meetingId, onComplete]);

  const percent = progress?.percent || 0;
  const isError = percent < 0;

  const formatETA = (seconds?: number) => {
    if (!seconds || seconds <= 0) return '正在分析中';
    if (seconds < 60) return `${seconds}秒`;
    const m = Math.floor(seconds / 60);
    const s = seconds % 60;
    return s > 0 ? `${m}分${s}秒` : `${m}分钟`;
  };

  return (
    <div
      style={{
        height: '100%',
        display: 'flex',
        flexDirection: 'column',
        justifyContent: 'center',
        alignItems: 'center',
        background: '#fff',
        borderRadius: 16,
        padding: 40,
      }}
    >
      <div style={{ width: '100%', maxWidth: 600, textAlign: 'center' }}>
        <Title level={3} style={{ marginBottom: 24 }}>AI 智能分析中</Title>
        <Progress
          type="circle"
          percent={isError ? 100 : percent}
          status={isError ? 'exception' : percent === 100 ? 'success' : 'active'}
          strokeColor={isError ? '#ff4d4f' : { '0%': '#108ee9', '100%': '#87d068' }}
          width={180}
          strokeWidth={8}
        />
        <div style={{ marginTop: 32 }}>
          <Text
            strong
            style={{ fontSize: 18, color: isError ? '#ff4d4f' : '#1890ff', display: 'block', marginBottom: 8 }}
          >
            {progress?.message || '正在准备计算资源...'}
          </Text>
          <Text type="secondary">分析过程中，请耐心等待，你可以先去处理其他工作</Text>
        </div>
        <Divider style={{ margin: '32px 0' }} />
        <Row gutter={24}>
          <Col span={8}>
            <Space direction="vertical" size={0}>
              <Text type="secondary">当前进度</Text>
              <Title level={4} style={{ margin: 0 }}>{isError ? 'ERROR' : `${percent}%`}</Title>
            </Space>
          </Col>
          <Col span={8}>
            <Space direction="vertical" size={0}>
              <Text type="secondary">预计剩余</Text>
              <Title level={4} style={{ margin: 0 }}>{isError ? '--' : formatETA(progress?.eta)}</Title>
            </Space>
          </Col>
          <Col span={8}>
            <Space direction="vertical" size={0}>
              <Text type="secondary">任务状态</Text>
              <Title level={4} style={{ margin: 0, color: isError ? '#ff4d4f' : '#52c41a' }}>
                {isError ? '已中断' : '正常'}
              </Title>
            </Space>
          </Col>
        </Row>
      </div>
    </div>
  );
};

const SpeakerEditor: React.FC<{
  meetingId: number;
  speakerId: string;
  initialName: string;
  initialLabel: string;
  onSuccess: () => void;
}> = ({ meetingId, speakerId, initialName, initialLabel, onSuccess }) => {
  const [name, setName] = useState(initialName || speakerId);
  const [label, setLabel] = useState(initialLabel);
  const [loading, setLoading] = useState(false);
  const { items: speakerLabels } = useDict('biz_speaker_label');

  const handleSave = async (e: React.MouseEvent) => {
    e.stopPropagation();
    setLoading(true);
    try {
      await updateSpeakerInfo({ meetingId, speakerId, newName: name, label });
      message.success('发言人信息已全局更新');
      onSuccess();
    } catch (err) {
      console.error(err);
    } finally {
      setLoading(false);
    }
  };

  return (
    <div style={{ width: 250, padding: '8px 4px' }} onClick={(e) => e.stopPropagation()}>
      <div style={{ marginBottom: 12 }}>
        <Text type="secondary">发言人姓名</Text>
        <Input
          value={name}
          onChange={(e) => setName(e.target.value)}
          placeholder="输入姓名"
          size="small"
          style={{ marginTop: 4 }}
        />
      </div>
      <div style={{ marginBottom: 16 }}>
        <Text type="secondary">角色标签</Text>
        <Select
          value={label}
          onChange={setLabel}
          placeholder="选择角色"
          style={{ width: '100%', marginTop: 4 }}
          size="small"
          allowClear
        >
          {speakerLabels.map((item) => (
            <Select.Option key={item.itemValue} value={item.itemValue}>
              {item.itemLabel}
            </Select.Option>
          ))}
        </Select>
      </div>
      <Button type="primary" size="small" block onClick={handleSave} loading={loading}>
        同步到全局
      </Button>
    </div>
  );
};

const MeetingDetail: React.FC = () => {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();
  const [form] = Form.useForm();
  const [summaryForm] = Form.useForm();

  const [meeting, setMeeting] = useState<MeetingVO | null>(null);
  const [transcripts, setTranscripts] = useState<MeetingTranscriptVO[]>([]);
  const [loading, setLoading] = useState(true);
  const [editVisible, setEditVisible] = useState(false);
  const [summaryVisible, setSummaryVisible] = useState(false);
  const [actionLoading, setActionLoading] = useState(false);
  const [downloadLoading, setDownloadLoading] = useState<'pdf' | 'word' | null>(null);

  const [llmModels, setLlmModels] = useState<AiModelVO[]>([]);
  const [prompts, setPrompts] = useState<PromptTemplateVO[]>([]);
  const [, setUserList] = useState<SysUser[]>([]);
  const { items: speakerLabels } = useDict('biz_speaker_label');

  const audioRef = useRef<HTMLAudioElement>(null);
  const summaryPdfRef = useRef<HTMLDivElement>(null);

  const isOwner = React.useMemo(() => {
    if (!meeting) return false;
    const profileStr = sessionStorage.getItem('userProfile');
    if (profileStr) {
      const profile = JSON.parse(profileStr);
      return profile.isPlatformAdmin === true || profile.userId === meeting.creatorId;
    }
    return false;
  }, [meeting]);

  useEffect(() => {
    if (id) {
      fetchData(Number(id));
      loadAiConfigs();
      loadUsers();
    }
  }, [id]);

  const fetchData = async (meetingId: number) => {
    try {
      const [detailRes, transcriptRes] = await Promise.all([getMeetingDetail(meetingId), getTranscripts(meetingId)]);
      setMeeting(detailRes.data.data);
      setTranscripts(transcriptRes.data.data || []);
    } catch (err) {
      console.error(err);
    } finally {
      setLoading(false);
    }
  };

  const loadAiConfigs = async () => {
    try {
      const [mRes, pRes, dRes] = await Promise.all([
        getAiModelPage({ current: 1, size: 100, type: 'LLM' }),
        getPromptPage({ current: 1, size: 100 }),
        getAiModelDefault('LLM'),
      ]);
      setLlmModels(mRes.data.data.records.filter((m) => m.status === 1));
      setPrompts(pRes.data.data.records.filter((p) => p.status === 1));
      summaryForm.setFieldsValue({ summaryModelId: dRes.data.data?.id });
    } catch (e) {
      // ignore
    }
  };

  const loadUsers = async () => {
    try {
      const users = await listUsers();
      setUserList(users || []);
    } catch (err) {
      // ignore
    }
  };

  const handleEditMeeting = () => {
    if (!meeting || !isOwner) return;
    form.setFieldsValue({
      ...meeting,
      tags: meeting.tags?.split(',').filter(Boolean),
    });
    setEditVisible(true);
  };

  const handleUpdateBasic = async () => {
    const vals = await form.validateFields();
    setActionLoading(true);
    try {
      await updateMeeting({
        ...vals,
        id: meeting?.id,
        tags: vals.tags?.join(','),
      });
      message.success('会议信息已更新');
      setEditVisible(false);
      fetchData(Number(id));
    } catch (err) {
      console.error(err);
    } finally {
      setActionLoading(false);
    }
  };

  const handleReSummary = async () => {
    const vals = await summaryForm.validateFields();
    setActionLoading(true);
    try {
      await reSummary({
        meetingId: Number(id),
        summaryModelId: vals.summaryModelId,
        promptId: vals.promptId,
      });
      message.success('已重新发起总结任务');
      setSummaryVisible(false);
      fetchData(Number(id));
    } catch (err) {
      console.error(err);
    } finally {
      setActionLoading(false);
    }
  };

  const formatTime = (ms: number) => {
    const seconds = Math.floor(ms / 1000);
    const m = Math.floor(seconds / 60);
    const s = seconds % 60;
    return `${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`;
  };

  const seekTo = (timeMs: number) => {
    if (audioRef.current) {
      audioRef.current.currentTime = timeMs / 1000;
      audioRef.current.play();
    }
  };

  const getFileNameFromDisposition = (disposition?: string, fallback?: string) => {
    if (!disposition) return fallback || 'summary';
    const utf8Match = disposition.match(/filename\*=UTF-8''([^;]+)/i);
    if (utf8Match?.[1]) return decodeURIComponent(utf8Match[1]);
    const normalMatch = disposition.match(/filename=\"?([^\";]+)\"?/i);
    return normalMatch?.[1] || fallback || 'summary';
  };

  const handleDownloadSummary = async (format: 'pdf' | 'word') => {
    if (!meeting) return;
    if (!meeting.summaryContent) {
      message.warning('当前暂无可下载的AI总结');
      return;
    }

    try {
      setDownloadLoading(format);
      const res = await downloadMeetingSummary(meeting.id, format);
      const contentType: string =
        res.headers['content-type'] ||
        (format === 'pdf'
          ? 'application/pdf'
          : 'application/vnd.openxmlformats-officedocument.wordprocessingml.document');

      // 后端若返回业务错误，可能是 JSON Blob，不能当文件保存
      if (contentType.includes('application/json')) {
        const text = await (res.data as Blob).text();
        try {
          const json = JSON.parse(text);
          message.error(json?.msg || '下载失败');
        } catch {
          message.error('下载失败');
        }
        return;
      }

      const blob = new Blob([res.data], { type: contentType });
      const url = window.URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = getFileNameFromDisposition(
        res.headers['content-disposition'],
        `${(meeting.title || 'meeting').replace(/[\\\\/:*?\"<>|\\r\\n]/g, '_')}-AI纪要.${format === 'pdf' ? 'pdf' : 'docx'}`,
      );
      document.body.appendChild(a);
      a.click();
      a.remove();
      window.URL.revokeObjectURL(url);
    } catch (err) {
      console.error(err);
      message.error(`${format.toUpperCase()}下载失败`);
    } finally {
      setDownloadLoading(null);
    }
  };

  if (loading) return <div style={{ padding: '24px' }}><Skeleton active /></div>;
  if (!meeting) return <div style={{ padding: '24px' }}><Empty description="会议不存在" /></div>;

  return (
    <div style={{ padding: '24px', height: 'calc(100vh - 64px)', overflow: 'hidden', display: 'flex', flexDirection: 'column' }}>
      <Breadcrumb style={{ marginBottom: '16px' }}>
        <Breadcrumb.Item><a onClick={() => navigate('/meetings')}>会议中心</a></Breadcrumb.Item>
        <Breadcrumb.Item>会议详情</Breadcrumb.Item>
      </Breadcrumb>

      <Card style={{ marginBottom: '16px', flexShrink: 0 }} bodyStyle={{ padding: '16px 24px' }}>
        <Row justify="space-between" align="middle">
          <Col>
            <Space direction="vertical" size={4}>
              <Title level={4} style={{ margin: 0 }}>
                {meeting.title}
                {isOwner && (
                  <EditOutlined
                    style={{ fontSize: 16, cursor: 'pointer', color: '#1890ff', marginLeft: 8 }}
                    onClick={handleEditMeeting}
                  />
                )}
              </Title>
              <Space split={<Divider type="vertical" />}>
                <Text type="secondary"><ClockCircleOutlined /> {dayjs(meeting.meetingTime).format('YYYY-MM-DD HH:mm')}</Text>
                <Space>{meeting.tags?.split(',').filter(Boolean).map((t) => <Tag key={t} color="blue">{t}</Tag>)}</Space>
                <Text type="secondary"><UserOutlined /> {meeting.participants || '未指定'}</Text>
              </Space>
            </Space>
          </Col>
          <Col>
            <Space>
              {isOwner && meeting.status === 3 && (
                <Button icon={<SyncOutlined />} type="primary" ghost onClick={() => setSummaryVisible(true)} disabled={actionLoading}>
                  重新总结
                </Button>
              )}
              {isOwner && meeting.status === 2 && (
                <Button icon={<LoadingOutlined />} type="primary" ghost disabled loading>
                  正在总结
                </Button>
              )}
              {meeting.status === 3 && !!meeting.summaryContent && (
                <>
                  <Button icon={<DownloadOutlined />} onClick={() => handleDownloadSummary('pdf')} loading={downloadLoading === 'pdf'}>
                    下载PDF
                  </Button>
                  <Button icon={<DownloadOutlined />} onClick={() => handleDownloadSummary('word')} loading={downloadLoading === 'word'}>
                    下载Word
                  </Button>
                </>
              )}
              <Button icon={<LeftOutlined />} onClick={() => navigate('/meetings')}>返回列表</Button>
            </Space>
          </Col>
        </Row>
      </Card>

      <div style={{ flex: 1, minHeight: 0 }}>
        {meeting.status === 1 || meeting.status === 2 ? (
          <MeetingProgressDisplay meetingId={meeting.id} onComplete={() => fetchData(meeting.id)} />
        ) : (
          <Row gutter={24} style={{ height: '100%' }}>
            <Col span={12} style={{ height: '100%' }}>
              <Card
                title={<span><AudioOutlined /> 语音转录</span>}
                style={{ height: '100%', display: 'flex', flexDirection: 'column' }}
                bodyStyle={{ flex: 1, overflowY: 'auto', padding: '16px', minHeight: 0 }}
                extra={meeting.audioUrl && <audio ref={audioRef} src={meeting.audioUrl} controls style={{ height: '32px' }} />}
              >
                <List
                  dataSource={transcripts}
                  renderItem={(item) => (
                    <List.Item
                      style={{ borderBottom: '1px solid #f0f0f0', padding: '12px 0', cursor: 'pointer' }}
                      onClick={() => seekTo(item.startTime)}
                    >
                      <List.Item.Meta
                        avatar={<Avatar icon={<UserOutlined />} style={{ backgroundColor: '#87d068' }} />}
                        title={
                          <Space>
                            {isOwner ? (
                              <Popover
                                content={
                                  <SpeakerEditor
                                    meetingId={meeting.id}
                                    speakerId={item.speakerId}
                                    initialName={item.speakerName}
                                    initialLabel={item.speakerLabel}
                                    onSuccess={() => fetchData(meeting.id)}
                                  />
                                }
                                title="编辑发言人"
                                trigger="click"
                              >
                                <span style={{ color: '#1890ff', cursor: 'pointer' }} onClick={(e) => e.stopPropagation()}>
                                  {item.speakerName || item.speakerId || '发言人'} <EditOutlined style={{ fontSize: '12px' }} />
                                </span>
                              </Popover>
                            ) : (
                              <Text strong>{item.speakerName || item.speakerId || '发言人'}</Text>
                            )}
                            {item.speakerLabel && (
                              <Tag color="blue">
                                {speakerLabels.find((l) => l.itemValue === item.speakerLabel)?.itemLabel || item.speakerLabel}
                              </Tag>
                            )}
                            <Text type="secondary" style={{ fontSize: '12px' }}>{formatTime(item.startTime)}</Text>
                          </Space>
                        }
                        description={<Text style={{ color: '#333' }}>{item.content}</Text>}
                      />
                    </List.Item>
                  )}
                  locale={{ emptyText: meeting.status < 3 ? '识别任务进行中...' : '暂无数据' }}
                />
              </Card>
            </Col>
            <Col span={12} style={{ height: '100%' }}>
              <Card
                title={<span><RobotOutlined /> AI 总结</span>}
                style={{ height: '100%', display: 'flex', flexDirection: 'column' }}
                bodyStyle={{ flex: 1, overflowY: 'auto', padding: '24px', minHeight: 0 }}
              >
                <div ref={summaryPdfRef}>
                  {meeting.summaryContent ? (
                    <div className="markdown-body"><ReactMarkdown>{meeting.summaryContent}</ReactMarkdown></div>
                  ) : (
                    <div style={{ textAlign: 'center', marginTop: '100px' }}>
                      {meeting.status === 2 ? (
                        <Space direction="vertical">
                          <LoadingOutlined style={{ fontSize: 24 }} spin />
                          <Text type="secondary">正在重新总结...</Text>
                        </Space>
                      ) : (
                        <Empty description="暂无总结" />
                      )}
                    </div>
                  )}
                </div>
              </Card>
            </Col>
          </Row>
        )}
      </div>

      <style>{`
        .markdown-body { font-size: 14px; line-height: 1.8; color: #333; }
        .markdown-body p { margin-bottom: 16px; }
        .markdown-body h1, .markdown-body h2, .markdown-body h3 { margin-top: 24px; margin-bottom: 16px; font-weight: 600; }
      `}</style>

      {isOwner && (
        <Modal
          title="编辑会议信息"
          open={editVisible}
          onOk={handleUpdateBasic}
          onCancel={() => setEditVisible(false)}
          confirmLoading={actionLoading}
          width={600}
        >
          <Form form={form} layout="vertical" style={{ marginTop: 16 }}>
            <Form.Item name="title" label="会议标题" rules={[{ required: true }]}><Input /></Form.Item>
            <Form.Item name="tags" label="业务标签"><Select mode="tags" placeholder="输入标签按回车" /></Form.Item>
            <Text type="warning">注：参会人员 ID 绑定后暂不支持在此编辑，如需调整请联系系统管理员。</Text>
          </Form>
        </Modal>
      )}

      {isOwner && (
        <Drawer
          title="重新生成 AI 总结"
          width={400}
          onClose={() => setSummaryVisible(false)}
          open={summaryVisible}
          extra={<Button type="primary" onClick={handleReSummary} loading={actionLoading}>开始总结</Button>}
        >
          <Form form={summaryForm} layout="vertical">
            <Form.Item name="summaryModelId" label="总结模型 (LLM)" rules={[{ required: true }]}>
              <Select placeholder="选择 LLM 模型">
                {llmModels.map((m) => (
                  <Option key={m.id} value={m.id}>
                    {m.modelName} {m.isDefault === 1 && <Tag color="gold" style={{ marginLeft: 4 }}>默认</Tag>}
                  </Option>
                ))}
              </Select>
            </Form.Item>
            <Form.Item name="promptId" label="提示词模板" rules={[{ required: true }]}>
              <Select placeholder="选择模板">
                {prompts.map((p) => <Option key={p.id} value={p.id}>{p.templateName}</Option>)}
              </Select>
            </Form.Item>
            <Divider />
            <Text type="secondary">提示：重新总结将基于当前语音转录全文重新生成纪要，原有总结内容会被覆盖。</Text>
          </Form>
        </Drawer>
      )}
    </div>
  );
};

export default MeetingDetail;