import { useState, useEffect, useCallback } from 'react';
import { useParams, Link } from 'react-router-dom';
import {
  
  ChevronRight,
  Cloud,
  Boxes,
  Container,
  Network,
  FileText,
  Shield,
  Activity,
  Clock,
} from 'lucide-react';

import { kubernetesApi } from '@/api';
import type { JsonData } from '@/types/common';

const RESOURCE_LINKS = [
  { type: 'deployments', label: 'Deployments', icon: Boxes, desc: '工作负载副本管理' },
  { type: 'pods', label: 'Pods', icon: Container, desc: '容器实例运行状态' },
  { type: 'cronjobs', label: 'CronJobs', icon: Clock, desc: '定时任务管理' },
  { type: 'services', label: 'Services', icon: Network, desc: '服务发现与负载均衡' },
  { type: 'ingresses', label: 'Ingresses', icon: Network, desc: '外部流量路由规则' },
  { type: 'configmaps', label: 'ConfigMaps', icon: FileText, desc: '配置字典' },
  { type: 'secrets', label: 'Secrets', icon: Shield, desc: '密钥与凭证' },
  { type: 'hpas', label: 'HPAs', icon: Activity, desc: '水平自动伸缩策略' },
];

export default function NamespaceOverviewPage() {
  const { clusterCode, namespace } = useParams<{ clusterCode: string; namespace: string }>();
  const [counts, setCounts] = useState<Record<string, number>>({});
  const [loading, setLoading] = useState(false);

  const loadCounts = useCallback(async () => {
    if (!clusterCode || !namespace) return;
    setLoading(true);
    try {
      const results = await Promise.allSettled([
        kubernetesApi.getNamespaceDeployments(clusterCode, namespace!),
        kubernetesApi.getNamespacePods(clusterCode, namespace!),
        kubernetesApi.getNamespaceServices(clusterCode, namespace!),
        kubernetesApi.getNamespaceIngresses(clusterCode, namespace!),
        kubernetesApi.getNamespaceConfigMaps(clusterCode, namespace!),
        kubernetesApi.getNamespaceSecrets(clusterCode, namespace!),
        kubernetesApi.getHPAs(clusterCode, namespace!),
        kubernetesApi.getCronJobs(clusterCode, namespace!),
      ]);
      const toArr = (v: JsonData) => Array.isArray(v) ? v : (v?.list || v?.data || []);
      setCounts({
        deployments: toArr(results[0].status === 'fulfilled' ? results[0].value : []).length,
        pods: toArr(results[1].status === 'fulfilled' ? results[1].value : []).length,
        services: toArr(results[2].status === 'fulfilled' ? results[2].value : []).length,
        ingresses: toArr(results[3].status === 'fulfilled' ? results[3].value : []).length,
        configmaps: toArr(results[4].status === 'fulfilled' ? results[4].value : []).length,
        secrets: toArr(results[5].status === 'fulfilled' ? results[5].value : []).length,
        hpas: toArr(results[6].status === 'fulfilled' ? results[6].value : []).length,
        cronjobs: toArr(results[7].status === 'fulfilled' ? results[7].value : []).length,
      });
    } catch { setCounts({}); } finally { setLoading(false); }
  }, [clusterCode, namespace]);

  useEffect(() => { loadCounts(); }, [loadCounts]);

  return (
    <div className="space-y-4">
      {/* Breadcrumb */}
      <div className="flex items-center gap-2 text-sm text-slate-500">
        <Link to="/kubernetes" className="hover:text-slate-300 transition-colors">集群</Link>
        <ChevronRight className="h-3 w-3" />
        <Link to={`/kubernetes/${clusterCode}`} className="hover:text-slate-300 transition-colors">{clusterCode}</Link>
        <ChevronRight className="h-3 w-3" />
        <span className="text-slate-300">{namespace}</span>
      </div>

      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-slate-100 flex items-center gap-2">
            <Cloud className="h-6 w-6 text-blue-400" />
            {namespace}
          </h1>
          <p className="text-sm text-slate-500 mt-1">命名空间概览</p>
        </div>
      </div>

      {/* Resource grid */}
      <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
        {RESOURCE_LINKS.map((r) => (
          <Link key={r.type}
            to={`/kubernetes/${clusterCode}/namespace/${namespace}/${r.type}`}
            className="bg-slate-900 border border-slate-800 rounded-lg p-4 hover:border-slate-600 hover:bg-slate-800/50 transition-all group"
          >
            <div className="flex items-center justify-between mb-2">
              <r.icon className="h-5 w-5 text-slate-500 group-hover:text-blue-400 transition-colors" />
              <ChevronRight className="h-4 w-4 text-slate-600 group-hover:text-slate-400 transition-colors" />
            </div>
            <div className="text-lg font-bold text-slate-100">{loading ? '-' : (counts[r.type] ?? 0)}</div>
            <div className="text-sm text-slate-500">{r.label}</div>
            <div className="text-xs text-slate-600 mt-1">{r.desc}</div>
          </Link>
        ))}
      </div>
    </div>
  );
}