import { useEffect, useState } from 'react';
import { Link, Outlet, useLocation, useNavigate, useParams } from 'react-router-dom';
import { Breadcrumb, Button, Space, Spin, Tabs, Tag, Typography } from 'antd';
import { ArrowLeftOutlined } from '@ant-design/icons';
import {
  PROMO_CODE_STATUS_LABELS,
  type PromoCodeItem,
  type PromoCodeStats,
} from '@dukang/shared-types';
import { request } from '../../lib/api';

export type PromoCodeDetailContext = {
  detail: PromoCodeItem & { stats?: PromoCodeStats };
  reload: () => Promise<void>;
};

export default function PromoCodeDetailLayout() {
  const { id = '' } = useParams();
  const navigate = useNavigate();
  const location = useLocation();
  const [detail, setDetail] = useState<(PromoCodeItem & { stats?: PromoCodeStats }) | null>(null);
  const [loading, setLoading] = useState(true);

  async function loadDetail() {
    setLoading(true);
    try {
      const res = await request<PromoCodeItem & { stats?: PromoCodeStats }>(`/admin/promo-codes/${id}`);
      setDetail(res);
    } catch {
      setDetail(null);
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    void loadDetail();
  }, [id]);

  const tabKey = location.pathname.endsWith('/users') ? 'users' : 'overview';

  if (loading) {
    return <Spin style={{ display: 'block', margin: '80px auto' }} />;
  }

  if (!detail) {
    return (
      <div>
        <Typography.Text type="danger">推广码不存在或加载失败</Typography.Text>
        <div style={{ marginTop: 16 }}>
          <Button onClick={() => navigate('/promo-codes')}>返回列表</Button>
        </div>
      </div>
    );
  }

  return (
    <div>
      <Breadcrumb
        style={{ marginBottom: 12 }}
        items={[
          { title: <Link to="/promo-codes">推广码管理</Link> },
          { title: detail.name },
        ]}
      />

      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', marginBottom: 16 }}>
        <Space direction="vertical" size={4}>
          <Space align="center">
            <Button
              type="text"
              icon={<ArrowLeftOutlined />}
              onClick={() => navigate('/promo-codes')}
              style={{ marginLeft: -8 }}
            />
            <Typography.Title level={4} style={{ margin: 0 }}>
              {detail.name}
            </Typography.Title>
            <Tag color={detail.status === 'ACTIVE' ? 'green' : 'default'}>
              {PROMO_CODE_STATUS_LABELS[detail.status] || detail.status}
            </Tag>
          </Space>
          <Typography.Text type="secondary" copyable={{ text: detail.code }}>
            码值：{detail.code}
          </Typography.Text>
        </Space>
      </div>

      <Tabs
        activeKey={tabKey}
        onChange={(key) => {
          if (key === 'users') navigate(`/promo-codes/${id}/users`);
          else navigate(`/promo-codes/${id}`);
        }}
        items={[
          { key: 'overview', label: '概览' },
          {
            key: 'users',
            label: `关联用户${detail.stats?.sourceMarkedCount != null ? ` (${detail.stats.sourceMarkedCount})` : ''}`,
          },
        ]}
        style={{ marginBottom: 16 }}
      />

      <Outlet context={{ detail, reload: loadDetail } satisfies PromoCodeDetailContext} />
    </div>
  );
}