import { useCallback, useState } from 'react';
import {
  Activity,
  AlertTriangle,
  BarChart3,
  Building2,
  FileCheck2,
  FileText,
  FileSpreadsheet,
  FilePenLine,
  Gauge,
  Hash,
  ImageIcon,
  ListChecks,
  Layers3,
  MessageSquare,
  Phone,
  RefreshCw,
  TrendingUp,
  RadioTower,
  ReceiptText,
  ClipboardList,
  Send,
  ServerCog,
  ScanSearch,
  Settings,
  Shield,
  ShieldOff,
  ShieldCheck,
  Users,
  UserX,
} from 'lucide-react';
import { adminApi, type PendingAuditCounts } from '@/api/adminApi';
import { getLastUserActivityAt, readSession, type LoginSession } from '@/api/session';
import { AppShell } from '@/layouts/AppShell';
import { PortalSessionBoundary } from '@/layouts/PortalSessionBoundary';
import { request } from '@/api/core/httpClient';
import { settleNotificationRequest, useNotificationPolling } from './useNotificationPolling';

const EMPTY_PENDING_AUDITS: Omit<PendingAuditCounts, 'total'> = {
  enterpriseCertifications: 0,
  smsAudits: 0,
  templates: 0,
  signatures: 0,
  drainageInfos: 0,
};

type NotificationValue<T> = { value: T; status: 'loading' | 'ready' | 'unavailable'; hasValue: boolean };

function initialNotification<T>(value: T): NotificationValue<T> {
  return { value, status: 'loading', hasValue: false };
}

function updateNotification<T>(
  previous: NotificationValue<T>,
  result: PromiseSettledResult<T>,
  available = true,
): NotificationValue<T> {
  return result.status === 'fulfilled' && available
    ? { value: result.value, status: 'ready', hasValue: true }
    : { ...previous, status: 'unavailable' };
}

function notificationDescription<T>(notification: NotificationValue<T>, description: string) {
  if (notification.status === 'loading') return '计数加载中';
  if (notification.status === 'unavailable') {
    return notification.hasValue ? '计数暂不可用，显示上次结果' : '计数暂不可用，尚未取得结果';
  }
  return description;
}

function canPollNotifications(userId: string) {
  const session = readSession('admin');
  return Boolean(
    session &&
    session.user.id === userId &&
    !session.locked &&
    Date.now() - getLastUserActivityAt() < session.idleTimeoutSeconds * 1000,
  );
}

export function AdminLayout() {
  return (
    <PortalSessionBoundary portal="admin">
      {(session) => <AdminAuthenticatedLayout key={session.user.id} session={session} />}
    </PortalSessionBoundary>
  );
}

function AdminAuthenticatedLayout({ session }: { session: LoginSession }) {
  const [pendingAudits, setPendingAudits] = useState(() => initialNotification(EMPTY_PENDING_AUDITS));
  const [retirementSummary, setRetirementSummary] = useState(() => initialNotification({ count: 0 }));
  const [reportSummary, setReportSummary] = useState(() => initialNotification({ count: 0 }));
  const [monitorSummary, setMonitorSummary] = useState(() => initialNotification({ count: 0 }));
  const [securityAlertSummary, setSecurityAlertSummary] = useState(() =>
    initialNotification({ count: 0, criticalCount: 0 }),
  );
  const [infrastructureAlertSummary, setInfrastructureAlertSummary] = useState(() =>
    initialNotification({ count: 0, criticalCount: 0 }),
  );
  const [sessionLocked, setSessionLocked] = useState(Boolean(session.locked));
  const canPoll = useCallback(() => canPollNotifications(session.user.id), [session.user.id]);
  const loadPendingAuditCount = useCallback(async (signal: AbortSignal, isCurrent: () => boolean) => {
    // This runs globally and on a timer, so it must not fan out through the full dashboard aggregation.
    const results = await Promise.allSettled([
      settleNotificationRequest(adminApi.getPendingAudits(undefined, signal), signal),
      settleNotificationRequest(adminApi.getSignatureRetirementUnreadCount(signal), signal),
      settleNotificationRequest(adminApi.getSecurityNotificationSummary(signal), signal),
      settleNotificationRequest(adminApi.getInfrastructureMonitoringNotificationSummary(signal), signal),
      settleNotificationRequest(request<{ count: number }>('/admin/report-notifications/summary', { signal }), signal),
      settleNotificationRequest(
        request<{ count: number; unavailable?: boolean }>('/admin/sending-monitor/notification-summary', { signal }),
        signal,
      ),
    ]);
    if (!isCurrent()) return false;
    const [audits, retirement, security, infrastructure, reporting, monitor] = results;
    const monitorAvailable = monitor.status === 'fulfilled' && !monitor.value.unavailable;
    setPendingAudits((previous) => updateNotification(previous, audits));
    setRetirementSummary((previous) => updateNotification(previous, retirement));
    setSecurityAlertSummary((previous) => updateNotification(previous, security));
    setInfrastructureAlertSummary((previous) => updateNotification(previous, infrastructure));
    setReportSummary((previous) => updateNotification(previous, reporting));
    setMonitorSummary((previous) => updateNotification(previous, monitor, monitorAvailable));
    return results.every((result) => result.status === 'fulfilled') && monitorAvailable;
  }, []);

  useNotificationPolling({
    enabled: session.portal === 'admin' && !sessionLocked,
    canPoll,
    poll: loadPendingAuditCount,
  });
  const auditLabel = (label: string) =>
    pendingAudits.status === 'ready'
      ? label
      : `${label}（${pendingAudits.status === 'loading' ? '计数加载中' : '计数暂不可用'}）`;

  return (
    <AppShell
      title="聆界短信平台运营端"
      subtitle="平台运营管理中心"
      workspaceName="平台运营工作区"
      loginPath="/admin/login"
      portal="admin"
      userName={session.user.displayName}
      userRole="平台管理员"
      onSessionLockedChange={setSessionLocked}
      reportingNotifications={[
        {
          label: '报备状态变化通知',
          count: reportSummary.value.count,
          description: notificationDescription(reportSummary, '按企业与小时汇总的未读消息'),
          to: '/admin/report-records?tab=readiness',
        },
        {
          label: '签名清退预警',
          count: retirementSummary.value.count,
          description: notificationDescription(retirementSummary, '今日未读且未抑制'),
          to: '/admin/signature-retirement',
        },
        {
          label: '报备进度提醒',
          description: '报备进度通知功能尚未开放',
          pending: true,
        },
      ]}
      alertNotifications={[
        {
          label: '发送质量告警',
          count: monitorSummary.value.count,
          description: notificationDescription(monitorSummary, '未读活动发送质量告警'),
          to: '/admin/monitor?tab=alerts',
        },
        {
          label: '安全检测与封禁',
          count: securityAlertSummary.value.count,
          description: notificationDescription(
            securityAlertSummary,
            securityAlertSummary.value.criticalCount > 0
              ? `${securityAlertSummary.value.criticalCount} 条严重告警待处置`
              : '待处置安全告警',
          ),
          to: '/admin/security-detection',
        },
        {
          label: '系统监控告警',
          count: infrastructureAlertSummary.value.count,
          description: notificationDescription(
            infrastructureAlertSummary,
            infrastructureAlertSummary.value.criticalCount > 0
              ? `${infrastructureAlertSummary.value.criticalCount} 条 Prometheus 严重告警`
              : 'Prometheus 活动告警',
          ),
          to: '/admin/system-monitoring#active-alerts',
        },
      ]}
      auditNotifications={[
        {
          label: auditLabel('企业认证待审'),
          count: pendingAudits.value.enterpriseCertifications,
          to: '/admin/enterprise-audit',
        },
        { label: auditLabel('短信审核待审'), count: pendingAudits.value.smsAudits, to: '/admin/sms-audit' },
        { label: auditLabel('模板待审'), count: pendingAudits.value.templates, to: '/admin/templates' },
        { label: auditLabel('签名待审'), count: pendingAudits.value.signatures, to: '/admin/signatures' },
        {
          label: auditLabel('签名导入待审'),
          count: pendingAudits.value.signatureImports ?? 0,
          to: '/admin/signatures?tab=import',
        },
        { label: auditLabel('引流信息待审'), count: pendingAudits.value.drainageInfos, to: '/admin/drainage-audits' },
      ]}
      navSections={[
        {
          title: '运营概览',
          icon: Gauge,
          items: [
            { label: '运营看板', to: '/admin', icon: Gauge },
            { label: '发送监控', to: '/admin/monitor', icon: Activity },
            { label: '网关异常', to: '/admin/gateway-submit-exceptions', icon: AlertTriangle },
            { label: '签名质量检测', to: '/admin/analytics', icon: BarChart3 },
          ],
        },
        {
          title: '客户管理',
          icon: Building2,
          items: [
            { label: '企业管理', to: '/admin/customer-enterprises', icon: Building2 },
            { label: '企业应用管理', to: '/admin/enterprise-applications', icon: Layers3 },
            { label: '企业签名管理', to: '/admin/enterprise-signatures', icon: FilePenLine },
            { label: '企业模板管理', to: '/admin/enterprise-templates', icon: FileCheck2 },
            { label: 'HTTP签名计算', to: '/admin/http-signature', icon: Hash },
          ],
        },
        {
          title: '审核中心',
          icon: FileCheck2,
          items: [
            { label: '企业认证审核', to: '/admin/enterprise-audit', icon: ShieldCheck },
            { label: '短信审核', to: '/admin/sms-audit', icon: MessageSquare },
            { label: '短信模板审核', to: '/admin/templates', icon: FileCheck2 },
            { label: '短信签名审核', to: '/admin/signatures', icon: FilePenLine },
            { label: '引流信息审核', to: '/admin/drainage-audits', icon: FilePenLine },
          ],
        },
        {
          title: '通道管理',
          icon: RadioTower,
          items: [
            { label: '短信通道管理', to: '/admin/channels', icon: RadioTower },
            { label: '彩信通道管理', to: '/admin/mms-channels', icon: ImageIcon, pending: true },
            { label: '短信通道组管理', to: '/admin/channel-groups', icon: Layers3 },
          ],
        },
        {
          title: '报备工作台',
          icon: ClipboardList,
          items: [
            { label: '报备资料池', to: '/admin/report-materials', icon: FileSpreadsheet },
            { label: '报备批次', to: '/admin/report-batches', icon: Layers3 },
            { label: '通道报备明细', to: '/admin/report-tasks', icon: ClipboardList },
            { label: '状态记录', to: '/admin/report-records', icon: ListChecks },
          ],
        },
        {
          title: '发送任务',
          icon: Send,
          items: [
            { label: '短信任务进度', to: '/admin/sms-task-progress', icon: TrendingUp },
            { label: '彩信任务进度', to: '/admin/mms-task-progress', icon: BarChart3, pending: true },
          ],
        },
        {
          title: '数据详单',
          icon: ReceiptText,
          items: [
            { label: '短信记录', to: '/admin/sms-records', icon: MessageSquare },
            { label: '彩信记录', to: '/admin/mms-records', icon: ImageIcon, pending: true },
            { label: '短信上行记录', to: '/admin/sms-uplink-records', icon: MessageSquare },
            { label: '下游投递记录', to: '/admin/downstream-deliveries', icon: Send },
            { label: '恢复状态管理', to: '/admin/downstream-recovery-statuses', icon: RefreshCw },
            { label: '充值记录', to: '/admin/recharge-records', icon: ReceiptText },
          ],
        },
        {
          title: '报表对账',
          icon: BarChart3,
          items: [
            { label: '对账单', to: '/admin/reconciliation-reports', icon: ReceiptText },
            { label: '利润报表', to: '/admin/profit-reports', icon: TrendingUp },
            { label: '发送质量报表', to: '/admin/quality-reports', icon: BarChart3 },
          ],
        },
        {
          title: '安全控制',
          icon: Shield,
          items: [
            { label: '风控规则', to: '/admin/risk-rules', icon: Shield },
            { label: '安全检测与封禁', to: '/admin/security-detection', icon: ShieldCheck },
            { label: '签名清退预警', to: '/admin/signature-retirement', icon: AlertTriangle },
            { label: '企业黑名单', to: '/admin/enterprise-blacklist', icon: UserX },
            { label: '全局黑名单', to: '/admin/global-blacklist', icon: ShieldOff },
            { label: '敏感词管理', to: '/admin/sensitive-words', icon: Shield },
          ],
        },
        {
          title: '系统管理',
          icon: Settings,
          items: [
            { label: '用户管理', to: '/admin/users', icon: Users },
            { label: '手机号段库', to: '/admin/phone-segments', icon: Phone },
            { label: '报备字段库', to: '/admin/drainage-fields', icon: Hash },
            { label: '引流识别规则', to: '/admin/drainage-detection-rules', icon: ScanSearch },
            { label: '系统日志', to: '/admin/system-logs', icon: FileText },
            { label: '系统监控', to: '/admin/system-monitoring', icon: ServerCog },
          ],
        },
      ]}
    />
  );
}