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

const pageSize = 20;

export function AdminProfitReportsPage() {
  const [rows, setRows] = useState<DailyProfitReport[]>([]);
  const [tenants, setTenants] = useState<TenantOption[]>([]);
  const [applications, setApplications] = useState<EnterpriseApplication[]>([]);
  const [channels, setChannels] = useState<AdminChannel[]>([]);
  const [dateRange, setDateRange] = useState<DateRangeValue>(defaultDateRange());
  const [dimensionType, setDimensionType] = useState<'application' | 'channel'>('application');
  const [tenantId, setTenantId] = useState('');
  const [applicationId, setApplicationId] = useState('');
  const [channelId, setChannelId] = useState('');
  const [page, setPage] = useState(1);
  const [total, setTotal] = useState(0);
  const [summary, setSummary] = useState<ProfitReportSummary>(emptyProfitSummary);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');
  const [exporting, setExporting] = useState(false);

  useEffect(() => {
    Promise.all([adminApi.listTenants(), adminApi.listEnterpriseApplications(), adminApi.listChannels()])
      .then(([nextTenants, nextApplications, nextChannels]) => { setTenants(nextTenants); setApplications(nextApplications); setChannels(nextChannels); })
      .catch(() => { setTenants([]); setApplications([]); setChannels([]); });
  }, []);
  useEffect(() => { void loadData(); }, [page, dateRange.start, dateRange.end, dimensionType, tenantId, applicationId, channelId]);

  async function loadData() {
    setLoading(true);
    setError('');
    try {
      const response = await adminApi.listProfitReports({ dateFrom: dateRange.start, dateTo: dateRange.end, dimensionType, tenantId: tenantId || undefined, applicationId: applicationId || undefined, channelId: channelId || undefined, page, pageSize });
      setRows(response.items);
      setTotal(response.total);
      setSummary(response.summary);
    } catch (failure) {
      setRows([]);
      setTotal(0);
      setSummary(emptyProfitSummary);
      setError(failure instanceof Error ? failure.message : '利润报表加载失败');
    } finally {
      setLoading(false);
    }
  }

  async function exportData() {
    setExporting(true); setError('');
    try { downloadBlob(await adminApi.exportProfitReports({ dateFrom: dateRange.start, dateTo: dateRange.end, dimensionType, tenantId: tenantId || undefined, applicationId: applicationId || undefined, channelId: channelId || undefined }), '利润报表.csv'); }
    catch (failure) { setError(failure instanceof Error ? failure.message : '利润报表导出失败'); }
    finally { setExporting(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', '利润报表']} /><h1>利润报表</h1></div>
        <div className="page-actions"><Button disabled={exporting} icon={<Download size={16} />} onClick={() => void exportData()} size="sm" variant="secondary">{exporting ? '导出中...' : '导出报表'}</Button><Tag tone="info">T+1 生成 · 每日重算 T-4～T-1</Tag></div>
      </div>

      <div className="surface admin-report-filter-grid admin-report-filter-grid--profit">
        <DateRangeInput label="发送日期" onChange={(value) => { setDateRange(value); setPage(1); }} value={dateRange} />
        <Select label="统计维度" onChange={(event) => { setDimensionType(event.target.value as 'application' | 'channel'); setTenantId(''); setApplicationId(''); setChannelId(''); setPage(1); }} options={[{ label: '按企业应用', value: 'application' }, { label: '按通道', value: 'channel' }]} value={dimensionType} />
        {dimensionType === 'application' ? <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="短信通道" onChange={(event) => { setChannelId(event.target.value); setPage(1); }} options={[{ label: '全部通道', value: '' }, ...channels.map((channel) => ({ label: channel.name, value: channel.id }))]} value={channelId} />}
        {dimensionType === 'application' ? <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} /> : <div />}
        <Button icon={<Search size={16} />} onClick={() => void loadData()}>查询</Button>
      </div>

      <div className="surface admin-report-summary">
        <div className="admin-report-summary__heading"><strong>筛选结果汇总</strong><span>统计全部匹配数据，不受当前分页影响</span></div>
        <div className="admin-report-summary__grid">{[
          ['提交合计', summary.submittedUnits.toLocaleString('zh-CN')], ['发送合计', summary.sentUnits.toLocaleString('zh-CN')], ['未知合计', summary.unknownUnits.toLocaleString('zh-CN')], ['成功合计', summary.successUnits.toLocaleString('zh-CN')], ['失败合计', summary.failedUnits.toLocaleString('zh-CN')],
          ['收入合计', `¥${formatCents(summary.revenueCents)}`], ['成本合计', `¥${formatCents(summary.costCents)}`], ['利润合计', `¥${formatCents(summary.profitCents)}`], ['综合利润率', `${(summary.profitRateBps / 100).toFixed(2)}%`],
        ].map(([label, value]) => <div key={label}><span>{label}</span><strong>{label.includes('合计') && ['收入合计', '成本合计', '利润合计'].includes(label) ? <MoneyText>{value}</MoneyText> : value}</strong></div>)}</div>
      </div>

      <div className="surface">
        <div className="ui-table-wrap">
          <table className="ui-table">
            <thead><tr><th>发送日期</th><th>{dimensionType === 'application' ? '企业 / 企业应用' : '通道'}</th><th>提交</th><th>发送</th><th>未知</th><th>成功</th><th>失败</th><th>收入</th><th>成本</th><th>利润</th><th>利润率</th><th>生成时间</th></tr></thead>
            <tbody>
              {error ? <tr><td className="ui-table__empty" colSpan={12}>{error}</td></tr>
                : loading ? <tr><td className="ui-table__empty" colSpan={12}>正在加载真实利润数据...</td></tr>
                  : rows.length === 0 ? <tr><td className="ui-table__empty" colSpan={12}>暂无已生成的利润报表</td></tr>
                    : rows.map((row) => <tr key={row.id}><td>{row.reportDate.slice(0, 10)}</td><td><strong>{row.dimensionName}</strong>{row.tenantName ? <div className="muted">{row.tenantName}</div> : null}</td><td>{row.submittedUnits.toLocaleString('zh-CN')}</td><td>{row.sentUnits.toLocaleString('zh-CN')}</td><td>{row.unknownUnits.toLocaleString('zh-CN')}</td><td>{row.successUnits.toLocaleString('zh-CN')}</td><td>{row.failedUnits.toLocaleString('zh-CN')}</td><td><MoneyText>¥{formatCents(row.revenueCents)}</MoneyText></td><td><MoneyText>¥{formatCents(row.costCents)}</MoneyText></td><td style={{ color: row.profitCents < 0 ? 'var(--danger)' : undefined }}><MoneyText>¥{formatCents(row.profitCents)}</MoneyText></td><td>{(row.profitRateBps / 100).toFixed(2)}%</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>
  );
}

const emptyProfitSummary: ProfitReportSummary = { submittedUnits: 0, sentUnits: 0, unknownUnits: 0, successUnits: 0, failedUnits: 0, revenueCents: 0, costCents: 0, profitCents: 0, profitRateBps: 0 };

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')}`;
}

function downloadBlob(blob: Blob, fileName: string) { const url = URL.createObjectURL(blob); const anchor = document.createElement('a'); anchor.href = url; anchor.download = fileName; anchor.click(); URL.revokeObjectURL(url); }