import { useEffect, useMemo, useState } from 'react';
import {
  BarChart3,
  DollarSign,
  FileCheck2,
  RadioTower,
  ShieldCheck,
  Users,
} from 'lucide-react';
import { useNavigate } from 'react-router-dom';
import {
  Breadcrumb,
  Button,
  Chart,
  Modal,
  Table,
  Tag,
  type TableColumn,
} from '@/components/ui';
import { adminApi, type DashboardResponse } from '@/api/adminApi';
import { createBarOption, createLineOption } from '@/theme/chartOptions';

type EnterpriseSpendRank = {
  id: string;
  enterprise: string;
  todaySpend: number;
  balanceStatus: '充足' | '紧张' | '欠费';
  availableBalance: number;
};

const balanceTone = {
  充足: 'success',
  紧张: 'warning',
  欠费: 'danger',
} as const;

function formatCurrency(value: number) {
  return value.toLocaleString('zh-CN', {
    minimumFractionDigits: 3,
    maximumFractionDigits: 3,
  });
}

function formatCount(value: number) {
  return value.toLocaleString('zh-CN');
}

export function AdminHome() {
  const navigate = useNavigate();
  const [dashboard, setDashboard] = useState<DashboardResponse | null>(null);
  const [error, setError] = useState('');
  const [selectedEnterprise, setSelectedEnterprise] = useState<EnterpriseSpendRank | null>(null);
  const [channels, setChannels] = useState<Array<{ id: string; name: string; status: string; rateLimitPerSecond: number }>>([]);

  useEffect(() => {
    Promise.all([adminApi.getDashboard(), adminApi.listChannels()])
      .then(([nextDashboard, nextChannels]) => {
        setDashboard(nextDashboard);
        setChannels(nextChannels);
      })
      .catch((err) => {
        setError(err instanceof Error ? err.message : '运营看板加载失败');
        setDashboard(null);
      });
  }, []);

  const enterpriseSpendRanks = useMemo<EnterpriseSpendRank[]>(() => {
    return (dashboard?.accounts ?? []).map((account) => {
      const todaySpend = Math.abs(dashboard?.recentRecharges
        .filter((item) => item.tenantId === account.tenantId)
        .reduce((sum, item) => sum + item.amountCents, 0) ?? 0) / 100;
      const availableBalance = (account.balanceCents + account.creditCents) / 100;
      return {
        id: account.tenantId,
        enterprise: account.tenant?.name ?? account.tenantId,
        todaySpend,
        availableBalance,
        balanceStatus: (availableBalance <= 0 ? '欠费' : availableBalance < 100 ? '紧张' : '充足') as EnterpriseSpendRank['balanceStatus'],
      };
    }).sort((left, right) => right.todaySpend - left.todaySpend);
  }, [dashboard]);

  const totalSend = dashboard?.today.sent ?? 0;
  const averageSuccessRate = dashboard?.today.successRate ?? 0;
  const todaySpend = (dashboard?.today.spendCents ?? 0) / 100;
  const activeConnectionCount = dashboard?.gatewayConnections.reduce((sum, item) => sum + (item._sum.currentConnections ?? 0), 0) ?? 0;
  const downstreamAlertCount = dashboard?.downstreamDeliverySummary?.alertCount ?? 0;
  const pendingAudits = dashboard?.pendingAudits ?? { enterpriseCertifications: 0, smsAudits: 0, templates: 0, signatures: 0, total: 0 };

  const sendTrendOption = useMemo(
    () => createLineOption({
      labels: ['今日'],
      series: [
        { name: '提交量', data: [dashboard?.today.sent ?? 0] },
        { name: '成功量', data: [dashboard?.today.delivered ?? 0] },
      ],
    }),
    [dashboard],
  );

  const auditTrendOption = useMemo(
    () => createBarOption({
      labels: ['企业认证', '短信审核', '模板', '签名'],
      series: [
        { name: '待审', data: [pendingAudits.enterpriseCertifications, pendingAudits.smsAudits, pendingAudits.templates, pendingAudits.signatures] },
      ],
    }),
    [pendingAudits],
  );

  const enterpriseColumns: Array<TableColumn<EnterpriseSpendRank>> = [
    { key: 'rank', title: '排名', width: '72px', render: (_record, index) => index + 1 },
    {
      key: 'enterprise',
      title: '企业名称',
      render: (record) => (
        <div>
          <strong>{record.enterprise}</strong>
          <p className="text-caption">{record.id}</p>
        </div>
      ),
    },
    { key: 'todaySpend', title: '今日消费（元）', align: 'right', render: (record) => `¥${formatCurrency(record.todaySpend)}` },
    { key: 'availableBalance', title: '可用余额', align: 'right', render: (record) => formatCount(record.availableBalance) },
    { key: 'balanceStatus', title: '余额状态', render: (record) => <Tag tone={balanceTone[record.balanceStatus]}>{record.balanceStatus}</Tag> },
    {
      key: 'actions',
      title: '操作',
      align: 'right',
      render: (record) => (
        <Button onClick={() => setSelectedEnterprise(record)} size="sm" variant="ghost">
          查看详情
        </Button>
      ),
    },
  ];

  const channelColumns: Array<TableColumn<(typeof channels)[number]>> = [
    { key: 'name', title: '通道名称', render: (record) => <strong>{record.name}</strong> },
    { key: 'status', title: '状态', render: (record) => <Tag tone={record.status === 'active' ? 'success' : 'neutral'}>{record.status}</Tag> },
    { key: 'rateLimitPerSecond', title: '限速', align: 'right', render: (record) => `${record.rateLimitPerSecond}/s` },
  ];

  return (
    <section className="page-stack admin-dashboard">
      <div className="overview-hero admin-dashboard-hero">
        <div>
          <Breadcrumb items={['数据概览']} />
          <p className="muted">按业务口径查看平台发送、签名、消费、审核和通道运行情况。</p>
        </div>
        <div className="page-actions">
          <Button icon={<FileCheck2 size={16} />} onClick={() => navigate('/admin/templates')} variant="ghost">
            处理审核
          </Button>
          <Button icon={<RadioTower size={16} />} onClick={() => navigate('/admin/channels')}>
            查看通道
          </Button>
        </div>
      </div>

      <div className="dashboard-grid admin-metric-grid">
        <div className="surface metric-card">
          <span>今日发送总量</span>
          <strong>{formatCount(totalSend)} 条</strong>
          <small>来自真实短信记录聚合</small>
        </div>
        <div className="surface metric-card">
          <span>总体成功率</span>
          <strong>{averageSuccessRate.toFixed(1)}%</strong>
          <small>delivered / 今日总量</small>
        </div>
        <div className="surface metric-card">
          <span>今日消费</span>
          <strong>¥{formatCurrency(todaySpend)}</strong>
          <small>来自今日消息金额聚合</small>
        </div>
        <div className="surface metric-card">
          <span>通道在线连接</span>
          <strong>{activeConnectionCount}</strong>
          <small>Gateway 连接状态回写</small>
        </div>
      </div>
      {error ? <div className="surface ui-table__empty">{error}</div> : null}

      <div className="chart-grid">
        <div className="surface chart-card">
          <h2>今日发送趋势</h2>
            <p className="muted">按真实后端今日聚合展示提交量和成功量。</p>
          <Chart height={300} option={sendTrendOption} />
        </div>
        <div className="surface chart-card">
          <h2>审核处理趋势</h2>
            <p className="muted">待审核数量来自真实审核聚合。</p>
          <Chart height={300} option={auditTrendOption} />
        </div>
      </div>

      <div className="surface section-stack">
        <div className="section-heading">
          <div>
            <h2>今日企业消费排行</h2>
            <p className="muted">来自真实账户、充值和消息金额聚合。</p>
          </div>
          <Button icon={<DollarSign size={16} />} size="sm" variant="ghost">
            导出排行
          </Button>
        </div>
        <Table columns={enterpriseColumns} data={enterpriseSpendRanks} rowKey="id" />
      </div>

      <div className="overview-grid">
        <div className="surface section-stack">
          <div className="section-heading">
            <div>
              <h2>通道运行</h2>
              <p className="muted">核心通道成功率和延迟。</p>
            </div>
            <Button onClick={() => navigate('/admin/channels')} size="sm" variant="ghost">
              管理通道
            </Button>
          </div>
          <Table columns={channelColumns} data={channels} rowKey="id" />
        </div>

        <div className="surface section-stack">
          <div className="section-heading">
            <div>
              <h2>运营状态</h2>
              <p className="muted">当日关键流程状态汇总。</p>
            </div>
            <BarChart3 size={20} className="status-info" />
          </div>
          <div className="overview-grid overview-grid--three">
            <Button className="mini-status-card" onClick={() => navigate('/admin/enterprise-audit')} variant="ghost">
              <FileCheck2 size={22} />
              <span>企业认证待审</span>
              <strong>{pendingAudits.enterpriseCertifications} 条</strong>
            </Button>
            <Button className="mini-status-card" onClick={() => navigate('/admin/sms-audit')} variant="ghost">
              <FileCheck2 size={22} />
              <span>短信审核待审</span>
              <strong>{pendingAudits.smsAudits} 条</strong>
            </Button>
            <Button className="mini-status-card" onClick={() => navigate('/admin/templates')} variant="ghost">
              <FileCheck2 size={22} />
              <span>模板待审</span>
              <strong>{pendingAudits.templates} 条</strong>
            </Button>
            <Button className="mini-status-card" onClick={() => navigate('/admin/enterprise-signatures')} variant="ghost">
              <FileCheck2 size={22} />
              <span>签名待审</span>
              <strong>{pendingAudits.signatures} 条</strong>
            </Button>
            <div className="mini-status-card">
              <ShieldCheck size={22} />
              <div>
                <span>平均等待</span>
                <strong>{dashboard?.taskCount ?? 0} 任务</strong>
                <small>真实批量任务总数。</small>
              </div>
            </div>
            <div className="mini-status-card">
              <Users size={22} />
              <div>
                <span>平台健康度</span>
                <strong>{activeConnectionCount}</strong>
                <small>在线连接数。</small>
              </div>
            </div>
            <div className="mini-status-card">
              <RadioTower size={22} />
              <div>
                <span>下游投递告警</span>
                <strong>{downstreamAlertCount} 条</strong>
                <small>积压过久或近期失败。</small>
              </div>
            </div>
          </div>
        </div>
      </div>

      <Modal
        footer={(
          <>
            <Button onClick={() => setSelectedEnterprise(null)} variant="ghost">关闭</Button>
            <Button onClick={() => navigate('/admin/recharge-records')}>查看充值记录</Button>
          </>
        )}
        onClose={() => setSelectedEnterprise(null)}
        open={Boolean(selectedEnterprise)}
        title={(
          <div className="ui-detail-title">
            <h2>企业消费详情</h2>
            <p>{selectedEnterprise?.id}</p>
          </div>
        )}
      >
        {selectedEnterprise ? (
          <div className="ui-detail-info-grid">
            <div className="ui-detail-info-grid__item">
              <span>企业名称</span>
              <strong>{selectedEnterprise.enterprise}</strong>
            </div>
            <div className="ui-detail-info-grid__item">
              <span>企业ID</span>
              <strong>{selectedEnterprise.id}</strong>
            </div>
            <div className="ui-detail-info-grid__item">
              <span>余额状态</span>
              <strong>
                <Tag tone={balanceTone[selectedEnterprise.balanceStatus]}>{selectedEnterprise.balanceStatus}</Tag>
              </strong>
            </div>
            <div className="ui-detail-info-grid__item">
              <span>今日消费</span>
              <strong>¥{formatCurrency(selectedEnterprise.todaySpend)}</strong>
            </div>
            <div className="ui-detail-info-grid__item">
              <span>可用余额</span>
              <strong>{formatCount(selectedEnterprise.availableBalance)}</strong>
            </div>
          </div>
        ) : null}
      </Modal>
    </section>
  );
}