import { useEffect, useMemo, useState } from 'react';
import { Search } from 'lucide-react';
import { adminApi, type DailyReconciliationReport, type EnterpriseApplication, type TenantOption } from '@/api/adminApi';
import { Breadcrumb, Button, DateRangeInput, Pagination, Select, Tag, type DateRangeValue } from '@/components/ui';
import { formatDateTime } from '@/utils/dateTime';

const pageSize = 20;

export function AdminReconciliationReportsPage() {
  const [rows, setRows] = useState<DailyReconciliationReport[]>([]);
  const [tenants, setTenants] = useState<TenantOption[]>([]);
  const [applications, setApplications] = useState<EnterpriseApplication[]>([]);
  const [dateRange, setDateRange] = useState<DateRangeValue>(defaultDateRange());
  const [tenantId, setTenantId] = useState('');
  const [applicationId, setApplicationId] = useState('');
  const [page, setPage] = useState(1);
  const [total, setTotal] = useState(0);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');

  useEffect(() => {
    Promise.all([adminApi.listTenants(), adminApi.listEnterpriseApplications()])
      .then(([nextTenants, nextApplications]) => { setTenants(nextTenants); setApplications(nextApplications); })
      .catch(() => { setTenants([]); setApplications([]); });
  }, []);

  useEffect(() => { void loadData(); }, [page, dateRange.start, dateRange.end, tenantId, applicationId]);

  async function loadData() {
    setLoading(true);
    setError('');
    try {
      const response = await adminApi.listReconciliationReports({
        dateFrom: dateRange.start,
        dateTo: dateRange.end,
        tenantId: tenantId || undefined,
        applicationId: applicationId || undefined,
        page,
        pageSize,
      });
      setRows(response.items);
      setTotal(response.total);
    } catch (failure) {
      setRows([]);
      setTotal(0);
      setError(failure instanceof Error ? failure.message : '对账单加载失败');
    } finally {
      setLoading(false);
    }
  }

  const availableApplications = useMemo(
    () => applications.filter((application) => !tenantId || application.tenantId === tenantId),
    [applications, tenantId],
  );
  const totalPages = Math.max(1, Math.ceil(total / pageSize));

  return (
    <section className="page-stack">
      <div className="page-heading">
        <div><Breadcrumb items={['报表对账', '对账单']} /><h1>对账单</h1></div>
        <Tag tone="info">T+1 生成 · 每日重算 T-4～T-1</Tag>
      </div>

      <div className="surface" style={{ display: 'grid', gap: 16, gridTemplateColumns: 'minmax(280px, 1.4fr) minmax(200px, 1fr) minmax(220px, 1fr) auto', padding: 20, alignItems: 'end' }}>
        <DateRangeInput label="发送日期" onChange={(value) => { setDateRange(value); setPage(1); }} value={dateRange} />
        <Select label="企业" onChange={(event) => { setTenantId(event.target.value); setApplicationId(''); setPage(1); }} options={[{ label: '全部企业', value: '' }, ...tenants.map((tenant) => ({ label: tenant.name, value: tenant.id }))]} value={tenantId} />
        <Select label="企业应用" onChange={(event) => { setApplicationId(event.target.value); setPage(1); }} options={[{ label: '全部应用', value: '' }, ...availableApplications.map((application) => ({ label: application.name, value: application.id }))]} value={applicationId} />
        <Button icon={<Search size={16} />} onClick={() => void loadData()}>查询</Button>
      </div>

      <div className="surface">
        <div className="ui-table-wrap">
          <table className="ui-table">
            <thead><tr><th>发送日期</th><th>企业</th><th>企业应用</th><th>日发送条数</th><th>成功条数</th><th>生成时间</th></tr></thead>
            <tbody>
              {error ? <tr><td className="ui-table__empty" colSpan={6}>{error}</td></tr>
                : loading ? <tr><td className="ui-table__empty" colSpan={6}>正在加载真实对账数据...</td></tr>
                  : rows.length === 0 ? <tr><td className="ui-table__empty" colSpan={6}>暂无已生成的对账单</td></tr>
                    : rows.map((row) => <tr key={row.id}><td>{row.reportDate.slice(0, 10)}</td><td>{row.tenantName}</td><td>{row.applicationName}</td><td>{row.sentUnits.toLocaleString('zh-CN')}</td><td>{row.successUnits.toLocaleString('zh-CN')}</td><td>{formatDateTime(row.generatedAt)}</td></tr>)}
            </tbody>
          </table>
        </div>
        <Pagination page={page} totalPages={totalPages} total={total} onPageChange={setPage} onPrevious={() => setPage((value) => Math.max(1, value - 1))} onNext={() => setPage((value) => Math.min(totalPages, value + 1))} previousDisabled={page <= 1} nextDisabled={page >= totalPages} />
      </div>
    </section>
  );
}

function defaultDateRange(): DateRangeValue {
  const end = new Date();
  end.setDate(end.getDate() - 1);
  const start = new Date(end);
  start.setDate(start.getDate() - 29);
  return { start: localDate(start), end: localDate(end) };
}

function localDate(value: Date) {
  return `${value.getFullYear()}-${String(value.getMonth() + 1).padStart(2, '0')}-${String(value.getDate()).padStart(2, '0')}`;
}