import { useEffect, useState } from 'react';
import {
  Button,
  Card,
  DatePicker,
  Descriptions,
  Drawer,
  Form,
  Modal,
  Select,
  Space,
  Statistic,
  Table,
  Tag,
  Typography,
  message,
} from 'antd';
import type { ColumnsType } from 'antd/es/table';
import type { Dayjs } from 'dayjs';
import { request, type Paginated } from '../lib/api';
import { ADMIN_OPTIONS_PAGE_SIZE, fmtTime } from '../lib/constants';
import { downloadExcelCsv } from '../lib/exportExcel';
import { useAdminList } from '../lib/useAdminList';

type Row = {
  id: string;
  billNo: string;
  billDate: string;
  redeemCount: number;
  redeemAmount: number;
  settlementRate: number;
  payoutAmount: number;
  status: string;
  paidAt?: string | null;
  store?: { id: string; name: string; cityName: string; phone?: string };
};

type StoreOption = { id: string; name: string; phone: string };

const STATUS_LABELS: Record<string, string> = {
  UNPAID: '未打款',
  PAID: '已打款',
};

const STATUS_COLORS: Record<string, string> = {
  UNPAID: 'red',
  PAID: 'green',
};

export default function StoreBillsPage() {
  const [form] = Form.useForm();
  const [filters, setFilters] = useState<Record<string, string>>({});
  const [stores, setStores] = useState<StoreOption[]>([]);
  const { data, loading, page, pageSize, setPage, setPageSize, reload } = useAdminList<Row>(
    '/admin/store-bills',
    () => {
      const qs = new URLSearchParams();
      if (filters.status) qs.set('status', filters.status);
      if (filters.storeId) qs.set('storeId', filters.storeId);
      if (filters.dateFrom) qs.set('dateFrom', filters.dateFrom);
      if (filters.dateTo) qs.set('dateTo', filters.dateTo);
      return qs;
    },
    [filters],
  );
  const [detail, setDetail] = useState<Record<string, unknown> | null>(null);
  const [drawerOpen, setDrawerOpen] = useState(false);
  const [exporting, setExporting] = useState(false);
  const [selectedKeys, setSelectedKeys] = useState<React.Key[]>([]);
  const [batchLoading, setBatchLoading] = useState(false);

  useEffect(() => {
    void request<Paginated<StoreOption>>(`/admin/stores?pageSize=${ADMIN_OPTIONS_PAGE_SIZE}`)
      .then((res) => setStores(res.items))
      .catch(() => {});
  }, []);

  function confirmPay(ids: string[], amountHint?: number) {
    Modal.confirm({
      title: '确认打款？',
      content: `将确认 ${ids.length} 笔门店对账单${amountHint != null ? `，合计约 ¥${amountHint.toFixed(2)}` : ''}。此操作不可撤销。`,
      okText: '确认打款',
      cancelText: '取消',
      onOk: async () => {
        if (ids.length === 1) {
          await request(`/admin/store-bills/${ids[0]}/confirm`, { method: 'POST' });
        } else {
          setBatchLoading(true);
          try {
            await request('/admin/store-bills/batch-confirm', {
              method: 'POST',
              body: JSON.stringify({ ids }),
            });
          } finally {
            setBatchLoading(false);
          }
        }
        message.success('已确认打款');
        setSelectedKeys([]);
        reload();
      },
    });
  }

  async function openDetail(id: string) {
    const d = await request<Record<string, unknown>>(`/admin/store-bills/${id}`);
    setDetail(d);
    setDrawerOpen(true);
  }

  async function exportExcel() {
    setExporting(true);
    try {
      const qs = new URLSearchParams();
      if (filters.status) qs.set('status', filters.status);
      if (filters.storeId) qs.set('storeId', filters.storeId);
      if (filters.dateFrom) qs.set('dateFrom', filters.dateFrom);
      if (filters.dateTo) qs.set('dateTo', filters.dateTo);
      const result = await request<{ csv: string; count: number }>(`/admin/store-bills/export?${qs}`);
      downloadExcelCsv(result.csv, `门店对账单_${filters.dateFrom || 'all'}_${filters.dateTo || 'all'}.csv`);
      message.success(`已导出 ${result.count} 条`);
    } finally {
      setExporting(false);
    }
  }

  const summary = data?.summary;
  const selectedRows = (data?.items ?? []).filter((r) => selectedKeys.includes(r.id));
  const selectedAmount = selectedRows.reduce((s, r) => s + Number(r.payoutAmount), 0);

  const columns: ColumnsType<Row> = [
    { title: '账单号', dataIndex: 'billNo', width: 170, ellipsis: true },
    {
      title: '账单日',
      dataIndex: 'billDate',
      width: 110,
      render: (v) => String(v || '').slice(0, 10),
    },
    { title: '门店', dataIndex: ['store', 'name'], width: 140, ellipsis: true },
    { title: '登录手机', dataIndex: ['store', 'phone'], width: 120, render: (v) => v || '—' },
    { title: '城市', dataIndex: ['store', 'cityName'], width: 90 },
    { title: '核销笔数', dataIndex: 'redeemCount', width: 90 },
    {
      title: '核销金额',
      dataIndex: 'redeemAmount',
      width: 110,
      render: (v) => `¥${Number(v).toFixed(2)}`,
    },
    {
      title: '结算比例',
      dataIndex: 'settlementRate',
      width: 90,
      render: (v) => `${Math.round(Number(v) * 100)}%`,
    },
    {
      title: '应付金额',
      dataIndex: 'payoutAmount',
      width: 110,
      render: (v) => `¥${Number(v).toFixed(2)}`,
    },
    {
      title: '状态',
      dataIndex: 'status',
      width: 90,
      render: (s) => <Tag color={STATUS_COLORS[s] || 'default'}>{STATUS_LABELS[s] || s}</Tag>,
    },
    {
      title: '操作',
      width: 160,
      fixed: 'right',
      render: (_, row) => (
        <Space size={0}>
          <Button type="link" size="small" onClick={() => void openDetail(row.id)}>
            明细
          </Button>
          {row.status === 'UNPAID' && (
            <Button type="link" size="small" onClick={() => confirmPay([row.id], Number(row.payoutAmount))}>
              确认打款
            </Button>
          )}
        </Space>
      ),
    },
  ];

  return (
    <div>
      <Space direction="vertical" size={0} style={{ marginBottom: 16 }}>
        <Typography.Title level={4} style={{ margin: 0 }}>
          门店对账单
        </Typography.Title>
        <Typography.Text type="secondary">
          按核销日汇总（每日 8:00 自动出账）；未打款红色、已打款绿色
        </Typography.Text>
      </Space>

      {summary && (
        <Card size="small" style={{ marginBottom: 16 }}>
          <Space size="large" wrap>
            <Statistic title="账单数" value={summary.count} />
            <Statistic title="核销金额合计" value={summary.redeemAmount ?? 0} prefix="¥" precision={2} />
            <Statistic title="应付合计" value={summary.payoutAmount ?? 0} prefix="¥" precision={2} />
          </Space>
        </Card>
      )}

      <Form
        form={form}
        layout="inline"
        style={{ marginBottom: 16 }}
        onFinish={(v: { storeId?: string; status?: string; range?: [Dayjs, Dayjs] }) => {
          setFilters({
            storeId: v.storeId || '',
            status: v.status || '',
            dateFrom: v.range?.[0] ? v.range[0].format('YYYY-MM-DD') : '',
            dateTo: v.range?.[1] ? v.range[1].format('YYYY-MM-DD') : '',
          });
          setPage(1);
        }}
      >
        <Form.Item name="storeId" label="门店">
          <Select
            allowClear
            showSearch
            placeholder="全部门店"
            style={{ width: 200 }}
            optionFilterProp="label"
            options={stores.map((s) => ({ value: s.id, label: s.name || s.phone || s.id }))}
          />
        </Form.Item>
        <Form.Item name="status" label="状态">
          <Select
            allowClear
            style={{ width: 120 }}
            options={Object.entries(STATUS_LABELS).map(([value, label]) => ({ value, label }))}
          />
        </Form.Item>
        <Form.Item name="range" label="账单日">
          <DatePicker.RangePicker />
        </Form.Item>
        <Form.Item>
          <Button type="primary" htmlType="submit">
            查询
          </Button>
        </Form.Item>
        <Form.Item>
          <Button
            onClick={() => {
              form.resetFields();
              setFilters({});
              setPage(1);
            }}
          >
            重置
          </Button>
        </Form.Item>
        <Form.Item>
          <Button loading={exporting} onClick={() => void exportExcel()}>
            导出 Excel
          </Button>
        </Form.Item>
        <Form.Item>
          <Button
            type="primary"
            disabled={!selectedKeys.length}
            loading={batchLoading}
            onClick={() => confirmPay(selectedKeys.map(String), selectedAmount)}
          >
            批量确认打款 ({selectedKeys.length})
          </Button>
        </Form.Item>
      </Form>

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

      <Drawer title="门店对账单明细" open={drawerOpen} onClose={() => setDrawerOpen(false)} width={520}>
        {detail && (
          <>
            <Descriptions column={1} size="small" bordered>
              <Descriptions.Item label="账单号">{String(detail.billNo)}</Descriptions.Item>
              <Descriptions.Item label="账单日">{String(detail.billDate || '').slice(0, 10)}</Descriptions.Item>
              <Descriptions.Item label="应付">¥{Number(detail.payoutAmount ?? 0).toFixed(2)}</Descriptions.Item>
              <Descriptions.Item label="状态">{STATUS_LABELS[String(detail.status)] || String(detail.status)}</Descriptions.Item>
              <Descriptions.Item label="打款时间">
                {detail.paidAt ? fmtTime(String(detail.paidAt)) : '—'}
              </Descriptions.Item>
            </Descriptions>
            <Typography.Title level={5} style={{ marginTop: 16 }}>
              核销明细
            </Typography.Title>
            <Table
              size="small"
              rowKey="id"
              pagination={false}
              dataSource={(detail.payouts as Array<Record<string, unknown>>) || []}
              columns={[
                {
                  title: '核销单号',
                  render: (_, r) => String((r.redeemRecord as { redeemNo?: string })?.redeemNo || '—'),
                },
                {
                  title: '金额',
                  dataIndex: 'payoutAmount',
                  render: (v) => `¥${Number(v).toFixed(2)}`,
                },
                {
                  title: '状态',
                  dataIndex: 'status',
                  render: (s) => (s === 'PAID' ? '已打款' : '未打款'),
                },
              ]}
            />
          </>
        )}
      </Drawer>
    </div>
  );
}