import { useState } from 'react';
import {
  Button,
  Descriptions,
  Drawer,
  Form,
  Input,
  InputNumber,
  Modal,
  Popconfirm,
  Select,
  Table,
  Tag,
  Typography,
  message,
} from 'antd';
import type { ColumnsType } from 'antd/es/table';
import type { AdminBenefitGrantRequest } from '@dukang/shared-types';
import { request } from '../lib/api';
import { COUPON_STATUS_LABELS, fmtTime } from '../lib/constants';
import { useAdminList } from '../lib/useAdminList';

type Row = {
  id: string;
  couponNo: string;
  totalAmount: number;
  balance: number;
  usedAmount: number;
  status: string;
  sourceProduct: string;
  createdAt: string;
  user?: { userNo: string; phone: string | null };
  order?: { orderNo: string } | null;
};

export default function BenefitCouponsPage() {
  const [form] = Form.useForm();
  const [grantForm] = Form.useForm<AdminBenefitGrantRequest>();
  const [filters, setFilters] = useState<Record<string, string>>({});
  const [grantOpen, setGrantOpen] = useState(false);
  const [granting, setGranting] = useState(false);
  const { data, loading, page, pageSize, setPage, setPageSize, reload } = useAdminList<Row>(
    '/admin/benefit/coupons',
    () => {
      const qs = new URLSearchParams();
      if (filters.couponNo) qs.set('couponNo', filters.couponNo);
      if (filters.status) qs.set('status', filters.status);
      if (filters.userId) qs.set('userId', filters.userId);
      return qs;
    },
    [filters],
  );
  const [detail, setDetail] = useState<Record<string, unknown> | null>(null);
  const [drawerOpen, setDrawerOpen] = useState(false);

  const columns: ColumnsType<Row> = [
    { title: '券号', dataIndex: 'couponNo', width: 200, ellipsis: false },
    { title: '用户', dataIndex: ['user', 'userNo'], width: 120, ellipsis: false },
    { title: '手机号', dataIndex: ['user', 'phone'], width: 120, render: (v) => v || '—' },
    {
      title: '订单',
      dataIndex: ['order', 'orderNo'],
      width: 180,
      ellipsis: false,
      render: (v) => v || '—',
    },
    { title: '总额', dataIndex: 'totalAmount', width: 80, render: (v) => `¥${v}` },
    { title: '余额', dataIndex: 'balance', width: 80, render: (v) => `¥${v}` },
    { title: '状态', dataIndex: 'status', width: 90, render: (s) => <Tag>{COUPON_STATUS_LABELS[s] || s}</Tag> },
    { title: '来源', dataIndex: 'sourceProduct', ellipsis: true },
    { title: '创建', dataIndex: 'createdAt', width: 160, render: fmtTime },
    {
      title: '操作',
      width: 80,
      render: (_, row) => (
        <Button
          type="link"
          size="small"
          onClick={async () => {
            setDetail(await request(`/admin/benefit/coupons/${row.id}`));
            setDrawerOpen(true);
          }}
        >
          详情
        </Button>
      ),
    },
  ];

  async function handleGrant(values: AdminBenefitGrantRequest) {
    setGranting(true);
    try {
      await request('/admin/benefit/coupons/grant', {
        method: 'POST',
        body: JSON.stringify({
          phone: values.phone.trim(),
          amount: values.amount,
          remark: values.remark?.trim() || undefined,
        }),
      });
      message.success('权益已发放');
      setGrantOpen(false);
      grantForm.resetFields();
      void reload();
    } catch (e) {
      message.error(e instanceof Error ? e.message : '发放失败');
    } finally {
      setGranting(false);
    }
  }

  return (
    <div>
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 16 }}>
        <Typography.Title level={4} style={{ margin: 0 }}>
          好客权益券
        </Typography.Title>
        <Button type="primary" onClick={() => setGrantOpen(true)}>
          手动发放
        </Button>
      </div>

      <Form form={form} layout="inline" style={{ marginBottom: 16 }} onFinish={(v) => { setFilters(v); setPage(1); }}>
        <Form.Item name="couponNo" label="券号">
          <Input allowClear />
        </Form.Item>
        <Form.Item name="status" label="状态">
          <Select
            allowClear
            style={{ width: 100 }}
            options={Object.entries(COUPON_STATUS_LABELS).map(([value, label]) => ({ value, label }))}
          />
        </Form.Item>
        <Form.Item>
          <Button type="primary" htmlType="submit">
            查询
          </Button>
        </Form.Item>
      </Form>

      <Table
        rowKey="id"
        className="admin-table-nowrap"
        loading={loading}
        columns={columns}
        dataSource={data?.items ?? []}
        scroll={{ x: 1200 }}
        pagination={{
          current: page,
          pageSize,
          total: data?.total ?? 0,
          showSizeChanger: true,
          onChange: (p, ps) => {
            setPage(p);
            setPageSize(ps);
          },
        }}
      />

      <Modal
        title="手动发放好客权益"
        open={grantOpen}
        onCancel={() => setGrantOpen(false)}
        onOk={() => grantForm.submit()}
        confirmLoading={granting}
        destroyOnClose
      >
        <Form form={grantForm} layout="vertical" onFinish={(v) => void handleGrant(v)}>
          <Form.Item
            name="phone"
            label="用户手机号"
            rules={[
              { required: true, message: '请输入用户手机号' },
              { pattern: /^1[3-9]\d{9}$/, message: '请输入正确的 11 位手机号' },
            ]}
          >
            <Input placeholder="已注册 C 端用户的手机号" maxLength={11} />
          </Form.Item>
          <Form.Item
            name="amount"
            label="权益金额（元）"
            rules={[{ required: true, message: '请输入权益金额' }]}
          >
            <InputNumber
              min={0.01}
              max={999999.99}
              precision={2}
              style={{ width: '100%' }}
              placeholder="发放金额"
            />
          </Form.Item>
          <Form.Item name="remark" label="备注">
            <Input.TextArea rows={2} maxLength={200} placeholder="可选，默认「总部手动发放」" />
          </Form.Item>
        </Form>
      </Modal>

      <Drawer
        title="权益券详情"
        width={560}
        open={drawerOpen}
        onClose={() => setDrawerOpen(false)}
        extra={
          detail &&
          detail.status !== 'VOID' && (
            <Popconfirm
              title="确认作废此券？"
              onConfirm={async () => {
                await request(`/admin/benefit/coupons/${detail.id}/void`, { method: 'POST' });
                message.success('已作废');
                setDrawerOpen(false);
                void reload();
              }}
            >
              <Button danger>作废</Button>
            </Popconfirm>
          )
        }
      >
        {detail && (
          <Descriptions column={1} bordered size="small">
            <Descriptions.Item label="券号">{String(detail.couponNo)}</Descriptions.Item>
            <Descriptions.Item label="用户">
              {String((detail.user as { userNo?: string } | undefined)?.userNo ?? '—')}
            </Descriptions.Item>
            <Descriptions.Item label="手机号">
              {String((detail.user as { phone?: string } | undefined)?.phone ?? '—')}
            </Descriptions.Item>
            <Descriptions.Item label="关联订单">
              {String((detail.order as { orderNo?: string } | null | undefined)?.orderNo ?? '—')}
            </Descriptions.Item>
            <Descriptions.Item label="总额">¥{String(detail.totalAmount)}</Descriptions.Item>
            <Descriptions.Item label="余额">¥{String(detail.balance)}</Descriptions.Item>
            <Descriptions.Item label="状态">
              {COUPON_STATUS_LABELS[String(detail.status)] || String(detail.status)}
            </Descriptions.Item>
            <Descriptions.Item label="来源">{String(detail.sourceProduct)}</Descriptions.Item>
          </Descriptions>
        )}
      </Drawer>
    </div>
  );
}