import { useEffect, useState, useCallback } from 'react';
import {
  Table,
  Button,
  Space,
  Modal,
  Form,
  Input,
  Select,
  Badge,
  message,
  Card,
  Row,
  Col,
  Tag,
} from 'antd';
import {
  CheckCircleOutlined,
} from '@ant-design/icons';
import dayjs from 'dayjs';
import {
  pointsApi,
  type PointsOrder,
} from '../../api/health/points';
import { patientApi } from '../../api/health/patients';
import { AuthButton } from '../../components/AuthButton';

/** 订单状态映射 */
const STATUS_MAP: Record<string, { text: string; color: string }> = {
  pending: { text: '待核销', color: 'orange' },
  verified: { text: '已核销', color: 'green' },
  cancelled: { text: '已取消', color: 'red' },
  expired: { text: '已过期', color: 'default' },
};

/** 状态筛选选项 */
const STATUS_OPTIONS = Object.entries(STATUS_MAP).map(([value, { text }]) => ({
  value,
  label: text,
}));

/** 截断 ID 显示 */
function truncateId(id: string): string {
  if (!id) return '-';
  return id.length > 12 ? `${id.slice(0, 8)}...${id.slice(-4)}` : id;
}

export default function PointsOrderList() {
  const [data, setData] = useState<PointsOrder[]>([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [pageSize, setPageSize] = useState(20);
  const [loading, setLoading] = useState(false);
  const [statusFilter, setStatusFilter] = useState<string | undefined>(undefined);
  const [verifyModalOpen, setVerifyModalOpen] = useState(false);
  const [verifyForm] = Form.useForm();
  const [verifying, setVerifying] = useState(false);

  // 名称缓存
  const [nameCache, setNameCache] = useState<Record<string, string>>({});

  // ---- 数据获取 ----
  const fetchData = useCallback(async (p = page, ps = pageSize) => {
    setLoading(true);
    try {
      const result = await pointsApi.listOrders({
        page: p,
        page_size: ps,
        status: statusFilter || undefined,
      });
      setData(result.data);
      setTotal(result.total);

      // 批量解析患者名称
      const patientIds = [...new Set(result.data.map((o) => o.patient_id))];
      const missingIds = patientIds.filter((id) => !nameCache[id]);
      if (missingIds.length > 0) {
        const newNames: Record<string, string> = {};
        await Promise.all(
          missingIds.map(async (id) => {
            try {
              const detail = await patientApi.get(id);
              newNames[id] = detail.name;
            } catch {
              newNames[id] = id.slice(0, 8);
            }
          }),
        );
        setNameCache((prev) => ({ ...prev, ...newNames }));
      }
    } catch {
      message.error('加载订单列表失败');
    } finally {
      setLoading(false);
    }
  }, [page, pageSize, statusFilter, nameCache]);

  useEffect(() => {
    fetchData();
  }, [fetchData]);

  // ---- 核销 ----
  const openVerifyModal = () => {
    verifyForm.resetFields();
    setVerifyModalOpen(true);
  };

  const handleVerify = async (values: { qr_code: string }) => {
    setVerifying(true);
    try {
      const order = await pointsApi.verifyOrder({ qr_code: values.qr_code });
      message.success(`核销成功，订单 ${truncateId(order.id)} 已确认`);
      setVerifyModalOpen(false);
      verifyForm.resetFields();
      fetchData(page, pageSize);
    } catch {
      message.error('核销失败，请检查二维码是否正确');
    } finally {
      setVerifying(false);
    }
  };

  // ---- 列定义 ----
  const columns = [
    {
      title: '订单号',
      dataIndex: 'id',
      key: 'id',
      width: 140,
      render: (val: string) => (
        <span style={{ fontFamily: 'monospace', fontSize: 12 }}>{truncateId(val)}</span>
      ),
    },
    {
      title: '患者',
      dataIndex: 'patient_id',
      key: 'patient_id',
      width: 100,
      render: (id: string) => nameCache[id] || id.slice(0, 8),
    },
    {
      title: '商品',
      dataIndex: 'product_name',
      key: 'product_name',
      width: 140,
      render: (name: string | null, record: PointsOrder) =>
        name || truncateId(record.product_id),
    },
    {
      title: '积分',
      dataIndex: 'points_cost',
      key: 'points_cost',
      width: 80,
      render: (val: number) => <span style={{ fontWeight: 600, color: '#d97706' }}>{val}</span>,
    },
    {
      title: '状态',
      dataIndex: 'status',
      key: 'status',
      width: 100,
      render: (val: string) => {
        const cfg = STATUS_MAP[val] || { text: val, color: 'default' };
        return <Badge status={cfg.color as 'success' | 'default' | 'processing' | 'error' | 'warning'} text={cfg.text} />;
      },
    },
    {
      title: '创建时间',
      dataIndex: 'created_at',
      key: 'created_at',
      width: 170,
      render: (val: string) => (val ? dayjs(val).format('YYYY-MM-DD HH:mm') : '-'),
    },
    {
      title: '核销时间',
      dataIndex: 'verified_at',
      key: 'verified_at',
      width: 170,
      render: (val: string) => (val ? dayjs(val).format('YYYY-MM-DD HH:mm') : '-'),
    },
    {
      title: '核销人',
      dataIndex: 'verified_by',
      key: 'verified_by',
      width: 100,
      render: (val: string | null) => val ? <Tag color="blue">{nameCache[val] || val.slice(0, 8)}</Tag> : '-',
    },
    {
      title: '过期时间',
      dataIndex: 'expires_at',
      key: 'expires_at',
      width: 170,
      render: (val: string | null) => {
        if (!val) return '-';
        const isExpired = dayjs(val).isBefore(dayjs());
        return (
          <span style={{ color: isExpired ? '#dc2626' : undefined }}>
            {dayjs(val).format('YYYY-MM-DD HH:mm')}
          </span>
        );
      },
    },
    {
      title: '备注',
      dataIndex: 'notes',
      key: 'notes',
      width: 150,
      ellipsis: true,
      render: (val: string | null) => val || '-',
    },
  ];

  return (
    <Card>
      {/* 筛选栏 */}
      <Row gutter={16} style={{ marginBottom: 16 }} align="middle">
        <Col flex="auto">
          <Space>
            <Select
              placeholder="筛选状态"
              value={statusFilter}
              onChange={(val) => {
                setStatusFilter(val);
                setPage(1);
              }}
              options={STATUS_OPTIONS}
              allowClear
              style={{ width: 140 }}
            />
          </Space>
        </Col>
        <Col>
          <AuthButton code="health.points.manage">
            <Button
              type="primary"
              icon={<CheckCircleOutlined />}
              onClick={openVerifyModal}
            >
              核销订单
            </Button>
          </AuthButton>
        </Col>
      </Row>

      {/* 数据表格 */}
      <Table
        rowKey="id"
        columns={columns}
        dataSource={data}
        loading={loading}
        scroll={{ x: 1200 }}
        pagination={{
          current: page,
          pageSize,
          total,
          showSizeChanger: true,
          showTotal: (t) => `共 ${t} 条`,
          onChange: (p, ps) => {
            setPage(p);
            setPageSize(ps);
          },
        }}
      />

      {/* 核销弹窗 */}
      <Modal
        title="核销订单"
        open={verifyModalOpen}
        onCancel={() => {
          setVerifyModalOpen(false);
          verifyForm.resetFields();
        }}
        onOk={() => verifyForm.submit()}
        confirmLoading={verifying}
        destroyOnClose
        width={440}
      >
        <Form form={verifyForm} layout="vertical" onFinish={handleVerify}>
          <Form.Item
            name="qr_code"
            label="二维码内容"
            rules={[{ required: true, message: '请输入或扫码获取二维码内容' }]}
          >
            <Input.TextArea
              rows={3}
              placeholder="请输入订单二维码内容，或使用扫码枪扫码"
              autoFocus
            />
          </Form.Item>
        </Form>
      </Modal>
    </Card>
  );
}