import React from 'react';
import { useNavigate } from 'react-router-dom';
import {
  Avatar,
  Button,
  Card,
  Divider,
  Space,
  Tag,
  Timeline,
  Typography,
} from 'antd';
import {
  ArrowRightOutlined,
  CalendarOutlined,
  ClockCircleOutlined,
  DeleteOutlined,
  EditOutlined,
  TeamOutlined,
  UserOutlined,
} from '@ant-design/icons';
import ActionButton from './ActionButton';
import tools from '../utils/tools';
import './MeetingInfoCard.css';

const { Text, Paragraph } = Typography;

const ROLE_META = {
  creator: {
    label: '我发起',
    tagClass: 'console-tag-soft-blue',
  },
  attendee: {
    label: '我参与',
    tagClass: 'console-tag-soft-green',
  },
};

const STATUS_META = {
  completed: {
    label: '已完成',
    tagClass: 'console-tag-soft-green',
  },
  failed: {
    label: '失败',
    tagClass: 'console-tag-soft-red',
  },
  transcribing: {
    label: '转写中',
    tagClass: 'console-tag-soft-blue',
  },
  summarizing: {
    label: '总结中',
    tagClass: 'console-tag-soft-orange',
  },
  pending: {
    label: '待处理',
    tagClass: 'console-tag-soft-default',
  },
};

const formatDateMeta = (date) => {
  const parsed = new Date(date);
  if (Number.isNaN(parsed.getTime())) {
    return { main: date, sub: '' };
  }
  return {
    main: tools.formatDateLong(date),
    sub: parsed.toLocaleDateString('zh-CN', { weekday: 'long' }),
  };
};

const getStatusMeta = (meeting) => STATUS_META[meeting?.overall_status || 'pending'] || STATUS_META.pending;
const getSummaryPreview = (summary) => {
  if (!summary) return '';
  return tools.stripMarkdown(summary).replace(/\s+/g, ' ').trim();
};

const MeetingTimeline = ({
  meetingsByDate,
  currentUser,
  onDeleteMeeting,
  hasMore = false,
  onLoadMore,
  loadingMore = false,
  filterType = 'all',
  searchQuery = '',
  selectedTags = [],
}) => {
  const navigate = useNavigate();

  const handleEditClick = (event, meetingId) => {
    event.preventDefault();
    event.stopPropagation();
    navigate(`/meetings/edit/${meetingId}`);
  };

  const handleDeleteClick = (event, meeting) => {
    event.preventDefault();
    event.stopPropagation();
    onDeleteMeeting(meeting.meeting_id);
  };

  const sortedDates = Object.keys(meetingsByDate).sort((a, b) => new Date(b) - new Date(a));

  const timelineItems = sortedDates.map((date) => {
    const dateMeta = formatDateMeta(date);
    return {
      label: (
        <div className="timeline-date-label">
          <Text className="timeline-date-main">{dateMeta.main}</Text>
          {dateMeta.sub ? <Text className="timeline-date-sub">{dateMeta.sub}</Text> : null}
        </div>
      ),
      dot: <span className="timeline-date-dot" />,
      children: (
        <div className="timeline-date-group">
          {meetingsByDate[date].map((meeting) => {
            const isCreator = String(meeting.creator_id) === String(currentUser.user_id);
            const roleMeta = isCreator ? ROLE_META.creator : ROLE_META.attendee;
            const statusMeta = getStatusMeta(meeting);
            const summaryPreview = getSummaryPreview(meeting.summary);
            const hasSummary = Boolean(summaryPreview);

            return (
              <Card
                key={meeting.meeting_id}
                hoverable
                variant="borderless"
                className="timeline-meeting-card console-surface shared-meeting-card"
                onClick={() => navigate(`/meetings/${meeting.meeting_id}`, {
                  state: { filterContext: { filterType, searchQuery, selectedTags } },
                })}
              >
                <div className="shared-meeting-card-shell">
                  <div className="shared-meeting-card-top">
                    <Space size={10} wrap>
                      <Tag bordered={false} className={`${roleMeta.tagClass} console-tag-large`}>
                        {roleMeta.label}
                      </Tag>
                      <Tag bordered={false} className={`${statusMeta.tagClass} console-tag-large`}>
                        {statusMeta.label}
                      </Tag>
                    </Space>
                    {isCreator ? (
                      <Space size={8}>
                        <ActionButton
                          tone="edit"
                          variant="iconSm"
                          tooltip="编辑"
                          icon={<EditOutlined />}
                          onClick={(event) => handleEditClick(event, meeting.meeting_id)}
                        />
                        <ActionButton
                          tone="delete"
                          variant="iconSm"
                          tooltip="删除"
                          icon={<DeleteOutlined />}
                          onClick={(event) => handleDeleteClick(event, meeting)}
                        />
                      </Space>
                    ) : null}
                  </div>

                  <div className="shared-meeting-card-title-block">
                    <Paragraph
                      className="shared-meeting-card-title"
                      ellipsis={{ rows: 2, tooltip: meeting.title }}
                    >
                      {meeting.title}
                    </Paragraph>
                  </div>

                  <div className={`shared-meeting-card-summary ${hasSummary ? '' : 'is-empty'}`}>
                    <Paragraph
                      className="shared-meeting-card-summary-content"
                      ellipsis={hasSummary ? { rows: 2, tooltip: summaryPreview } : false}
                    >
                      {hasSummary ? summaryPreview : '暂无摘要'}
                    </Paragraph>
                  </div>

                  <div className="shared-meeting-card-meta">
                    <Space size={10}>
                      <ClockCircleOutlined className="shared-meeting-card-meta-icon" />
                      <Text className="shared-meeting-card-meta-text">
                        {tools.formatTime(meeting.meeting_time || meeting.created_at)}
                      </Text>
                    </Space>
                    <Divider type="vertical" />
                    <Space size={10}>
                      <TeamOutlined className="shared-meeting-card-meta-icon" />
                      <Text className="shared-meeting-card-meta-text">{meeting.attendees?.length || 0} 人</Text>
                    </Space>
                  </div>

                  <div className="shared-meeting-card-footer">
                    <Space>
                      <Avatar size="small" src={meeting.creator_avatar_url} icon={<UserOutlined />} />
                      <Text type="secondary" className="shared-meeting-card-footer-user">{meeting.creator_username}</Text>
                    </Space>
                    <ActionButton tone="view" variant="textSm" icon={<ArrowRightOutlined />} className="shared-meeting-card-footer-link">
                      查看详情
                    </ActionButton>
                  </div>
                </div>
              </Card>
            );
          })}
        </div>
      ),
    };
  });

  return (
    <div className="modern-timeline">
      <Timeline mode="left" items={timelineItems} />
        <div style={{ textAlign: 'center', marginTop: 28 }}>
          {hasMore ? (
            <Button className="btn-pill-secondary" onClick={onLoadMore} loading={loadingMore} icon={<CalendarOutlined />}>
              加载更多
            </Button>
          ) : (
            <Divider plain><Text type="secondary">已加载全部会议</Text></Divider>
          )}
        </div>
    </div>
  );
};

export default MeetingTimeline;