import { useState, useEffect } from 'react';
import { cn } from '@/lib/utils';
import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Badge } from '@/components/ui/badge';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import {
  Cloud,
  Plus,
  MoreHorizontal,
  Server,
  Database,
  CheckCircle,
  AlertTriangle,
  XCircle,
  RefreshCw,
  Settings,
  Eye,
  Trash2,
  Search,
  Container,
  Download,
} from 'lucide-react';
import { kubernetesApi } from '@/services/api';
import { toast } from 'sonner';
import type { KubernetesCluster } from '@/types';
import { KubernetesClusterDetail } from './KubernetesClusterDetail';
import { KubernetesClusterDialog } from './KubernetesClusterDialog';
import { KubectlTerminal } from './KubectlTerminal';

export function KubernetesClusters() {
  const [clusters, setClusters] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [selectedCluster, setSelectedCluster] = useState<string | null>(null);
  const [searchQuery, setSearchQuery] = useState('');

  // 创建/编辑集群弹窗
  const [dialogOpen, setDialogOpen] = useState(false);
  const [editingCluster, setEditingCluster] = useState<any>(null);

  // kubectl 终端
  const [kubectlCluster, setKubectlCluster] = useState<{id: number; name: string} | null>(null);
  const [kubectlTerminalOpen, setKubectlTerminalOpen] = useState(false);

  // 导出资源弹窗
  const [exportCluster, setExportCluster] = useState<any>(null);
  const [exporting, setExporting] = useState(false);

  const loadData = async () => {
    try {
      setLoading(true);
      const res: any = await kubernetesApi.getClusters();
      setClusters(res?.list || []);
    } catch (e) {
      console.error('加载集群列表失败:', e);
      setClusters([]);
    } finally {
      setLoading(false);
    }
  };

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

  // 新建后自动同步
  const [pendingSyncId, setPendingSyncId] = useState<number | null>(null);

  const handleSaved = () => {
    loadData().then(() => {
      if (!editingCluster) {
        // 新建集群后，等列表刷新完再取最新一条同步
        setTimeout(async () => {
          const res: any = await kubernetesApi.getClusters();
          const list = res?.list || [];
          if (list.length > 0) {
            handleSync(list[list.length - 1].id, true);
          }
        }, 500);
      }
    });
  };

  const handleDelete = async (id: string) => {
    try {
      await kubernetesApi.deleteCluster(id);
      loadData();
    } catch (e) {
      console.error('删除集群失败:', e);
    }
  };

  const handleSync = async (id: number | string, silent?: boolean) => {
    try {
      if (!silent) toast.info('正在同步集群资源...');
      const res: any = await kubernetesApi.syncCluster(id);
      if (!silent) toast.success(res?.message || '同步完成');
      loadData();
    } catch (e: any) {
      if (!silent) toast.error(e?.message || '同步失败');
    }
  };

  const handleExport = async () => {
    if (!exportCluster) return;
    const code = exportCluster.code || String(exportCluster.id);
    try {
      setExporting(true);
      toast.info(`正在导出 ${exportCluster.name} 所有命名空间的资源...`);
      await kubernetesApi.exportAllResources(code);
      toast.success('导出完成，已开始下载');
      setExportCluster(null);
    } catch (e: any) {
      toast.error(e?.message || '导出失败');
    } finally {
      setExporting(false);
    }
  };

  const filteredClusters = clusters.filter(
    (cluster) =>
      (cluster.name || '').toLowerCase().includes(searchQuery.toLowerCase()) ||
      (cluster.version || '').includes(searchQuery)
  );

  const getStatusBadge = (status: KubernetesCluster['status']) => {
    switch (status) {
      case 'healthy':
        return (
          <Badge variant="outline" className="border-emerald-500/30 text-emerald-400 bg-emerald-500/10">
            <CheckCircle className="h-3 w-3 mr-1" />
            健康
          </Badge>
        );
      case 'warning':
        return (
          <Badge variant="outline" className="border-amber-500/30 text-amber-400 bg-amber-500/10">
            <AlertTriangle className="h-3 w-3 mr-1" />
            警告
          </Badge>
        );
      case 'error':
        return (
          <Badge variant="outline" className="border-red-500/30 text-red-400 bg-red-500/10">
            <XCircle className="h-3 w-3 mr-1" />
            异常
          </Badge>
        );
      default:
        return null;
    }
  };

  const clusterDetail = selectedCluster ? clusters.find((c) => c.id === selectedCluster) : null;

  return (
    <div className="space-y-6">
      {/* Page Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-slate-100">集群列表</h1>
          <p className="text-sm text-slate-500 mt-1">管理Kubernetes集群资源</p>
        </div>
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            className="border-slate-700 text-slate-300 hover:text-slate-100 hover:bg-slate-800"
            onClick={loadData}
          >
            <RefreshCw className={cn('h-4 w-4 mr-2', loading && 'animate-spin')} />
            刷新
          </Button>
          <Button className="bg-blue-600 hover:bg-blue-700 text-white" onClick={() => { setEditingCluster(null); setDialogOpen(true); }}>
            <Plus className="h-4 w-4 mr-2" />
            添加集群
          </Button>
        </div>
      </div>

      {/* Stats Cards */}
      <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
        <Card className="bg-slate-900 border-slate-800">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-sm text-slate-500">集群总数</p>
                <p className="text-2xl font-bold text-slate-100">{clusters.length}</p>
              </div>
              <div className="p-3 rounded-lg bg-blue-500/10 text-blue-400">
                <Cloud className="h-5 w-5" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-900 border-slate-800">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-sm text-slate-500">健康集群</p>
                <p className="text-2xl font-bold text-emerald-400">
                  {clusters.filter((c) => c.status === 'healthy').length}
                </p>
              </div>
              <div className="p-3 rounded-lg bg-emerald-500/10 text-emerald-400">
                <CheckCircle className="h-5 w-5" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-900 border-slate-800">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-sm text-slate-500">总节点数</p>
                <p className="text-2xl font-bold text-slate-100">
                  {clusters.reduce((acc, c) => acc + (c.node_count || 0), 0)}
                </p>
              </div>
              <div className="p-3 rounded-lg bg-purple-500/10 text-purple-400">
                <Server className="h-5 w-5" />
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className="bg-slate-900 border-slate-800">
          <CardContent className="p-4">
            <div className="flex items-center justify-between">
              <div>
                <p className="text-sm text-slate-500">总Pod数</p>
                <p className="text-2xl font-bold text-slate-100">
                  {clusters.reduce((acc, c) => acc + (c.pod_count || 0), 0)}
                </p>
              </div>
              <div className="p-3 rounded-lg bg-cyan-500/10 text-cyan-400">
                <Database className="h-5 w-5" />
              </div>
            </div>
          </CardContent>
        </Card>
      </div>

      {/* Search */}
      <div className="flex items-center gap-3">
        <div className="relative w-80">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-slate-500" />
          <Input
            placeholder="搜索集群名称或版本..."
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            className="pl-9 h-9 bg-slate-800/50 border-slate-700 text-slate-200 placeholder:text-slate-500"
          />
        </div>
      </div>

      {/* Clusters Grid */}
      <div className="grid grid-cols-1 lg:grid-cols-2 xl:grid-cols-3 gap-4">
        {loading ? (
          <Card className="bg-slate-900 border-slate-800 col-span-full">
            <CardContent className="p-12 text-center text-slate-500">
              <RefreshCw className="h-6 w-6 animate-spin mx-auto mb-3" />
              加载中...
            </CardContent>
          </Card>
        ) : filteredClusters.length === 0 ? (
          <Card className="bg-slate-900 border-slate-800 col-span-full">
            <CardContent className="p-12 text-center text-slate-500">暂无集群数据</CardContent>
          </Card>
        ) : (
          filteredClusters.map((cluster) => {
            const cpuUsage = Number(cluster.cpu_usage || 0);
            const memoryUsage = Number(cluster.memory_usage || 0);
            const hasMetrics = cpuUsage > 0 || memoryUsage > 0;
            return (
              <Card
                key={cluster.id}
                className={cn(
                  'bg-slate-900 border-slate-800 cursor-pointer transition-all',
                  selectedCluster === cluster.id
                    ? 'border-blue-500 ring-1 ring-blue-500/30'
                    : 'hover:border-slate-700'
                )}
                onClick={() => setSelectedCluster(cluster.id)}
              >
                <CardHeader className="pb-3">
                  <div className="flex items-start justify-between">
                    <div className="flex items-center gap-3">
                      <div className="w-10 h-10 rounded-lg bg-blue-500/10 flex items-center justify-center">
                        <Cloud className="h-5 w-5 text-blue-400" />
                      </div>
                      <div>
                        <CardTitle className="text-base text-slate-100">{cluster.name}</CardTitle>
                        <CardDescription className="text-slate-500">{cluster.version}</CardDescription>
                      </div>
                    </div>
                    <div className="flex items-center gap-1">
                      {getStatusBadge(cluster.status)}
                      <DropdownMenu>
                        <DropdownMenuTrigger asChild>
                          <Button
                            variant="ghost"
                            size="icon"
                            className="h-8 w-8 text-slate-400 hover:text-slate-100"
                            onClick={(e) => e.stopPropagation()}
                          >
                            <MoreHorizontal className="h-4 w-4" />
                          </Button>
                        </DropdownMenuTrigger>
                        <DropdownMenuContent align="end" className="w-48 bg-slate-800 border-slate-700">
                          <DropdownMenuLabel className="text-slate-300">操作</DropdownMenuLabel>
                          <DropdownMenuSeparator className="bg-slate-700" />
                          <DropdownMenuItem className="text-slate-300 focus:bg-slate-700 focus:text-slate-100">
                            <Eye className="h-4 w-4 mr-2" />
                            查看详情
                          </DropdownMenuItem>
                          <DropdownMenuItem
                            className="text-slate-300 focus:bg-slate-700 focus:text-slate-100"
                            onClick={(e) => {
                              e.stopPropagation();
                              setEditingCluster(cluster);
                              setDialogOpen(true);
                            }}
                          >
                            <Settings className="h-4 w-4 mr-2" />
                            配置
                          </DropdownMenuItem>
                          <DropdownMenuItem
                            className="text-cyan-400 focus:bg-slate-700 focus:text-cyan-300"
                            onClick={(e) => {
                              e.stopPropagation();
                              handleSync(cluster.id);
                            }}
                          >
                            <RefreshCw className="h-4 w-4 mr-2" />
                            同步
                          </DropdownMenuItem>
                          <DropdownMenuItem
                            className="text-emerald-400 focus:bg-slate-700 focus:text-emerald-300"
                            onClick={(e) => {
                              e.stopPropagation();
                              setKubectlCluster({ id: cluster.id, name: cluster.name });
                              setKubectlTerminalOpen(true);
                            }}
                          >
                            <Container className="h-4 w-4 mr-2" />
                            kubectl
                          </DropdownMenuItem>
                          <DropdownMenuItem
                            className="text-blue-400 focus:bg-slate-700 focus:text-blue-300"
                            onClick={(e) => {
                              e.stopPropagation();
                              setExportCluster(cluster);
                            }}
                          >
                            <Download className="h-4 w-4 mr-2" />
                            导出资源
                          </DropdownMenuItem>
                          <DropdownMenuSeparator className="bg-slate-700" />
                          <DropdownMenuItem
                            className="text-red-400 focus:bg-slate-700 focus:text-red-400"
                            onClick={(e) => {
                              e.stopPropagation();
                              handleDelete(cluster.id);
                            }}
                          >
                            <Trash2 className="h-4 w-4 mr-2" />
                            删除
                          </DropdownMenuItem>
                        </DropdownMenuContent>
                      </DropdownMenu>
                    </div>
                  </div>
                </CardHeader>
                <CardContent className="pt-0">
                  <div className="grid grid-cols-4 gap-2 mb-4">
                    <div className="text-center p-2 rounded-lg bg-slate-800/50">
                      <div className="text-lg font-semibold text-slate-200">{cluster.node_count || 0}</div>
                      <div className="text-xs text-slate-500">节点</div>
                    </div>
                    <div className="text-center p-2 rounded-lg bg-slate-800/50">
                      <div className="text-lg font-semibold text-slate-200">{cluster.pod_count || 0}</div>
                      <div className="text-xs text-slate-500">Pod</div>
                    </div>
                    <div className="text-center p-2 rounded-lg bg-slate-800/50">
                      <div className="text-lg font-semibold text-slate-200">{cluster.service_count || 0}</div>
                      <div className="text-xs text-slate-500">Service</div>
                    </div>
                    <div className="text-center p-2 rounded-lg bg-slate-800/50">
                      <div className="text-lg font-semibold text-slate-200">{cluster.deployment_count || 0}</div>
                      <div className="text-xs text-slate-500">Deployment</div>
                    </div>
                  </div>
                  <div className="space-y-2">
                    {hasMetrics ? (
                      <>
                        <div className="flex items-center gap-2">
                          <span className="text-xs text-slate-500 w-10">CPU</span>
                          <div className="flex-1 h-1.5 bg-slate-800 rounded-full overflow-hidden">
                            <div
                              className={cn(
                                'h-full rounded-full',
                                cpuUsage > 80 ? 'bg-red-400' : cpuUsage > 60 ? 'bg-amber-400' : 'bg-emerald-400'
                              )}
                              style={{ width: `${Math.min(cpuUsage, 100)}%` }}
                            />
                          </div>
                          <span className="text-xs text-slate-400 w-10 text-right">{cpuUsage.toFixed(1)}%</span>
                        </div>
                        <div className="flex items-center gap-2">
                          <span className="text-xs text-slate-500 w-10">内存</span>
                          <div className="flex-1 h-1.5 bg-slate-800 rounded-full overflow-hidden">
                            <div
                              className={cn(
                                'h-full rounded-full',
                                memoryUsage > 80 ? 'bg-red-400' : memoryUsage > 60 ? 'bg-amber-400' : 'bg-emerald-400'
                              )}
                              style={{ width: `${Math.min(memoryUsage, 100)}%` }}
                            />
                          </div>
                          <span className="text-xs text-slate-400 w-10 text-right">{memoryUsage.toFixed(1)}%</span>
                        </div>
                      </>
                    ) : (
                      <div className="text-xs text-slate-600 text-center">已接入 {cluster.node_count || 0} 节点 · {cluster.pod_count || 0} Pod · 资源使用率待采集</div>
                    )}
                  </div>
                </CardContent>
              </Card>
            );
          })
        )}
      </div>

      {/* Cluster Detail */}
      {clusterDetail && (
        <KubernetesClusterDetail cluster={clusterDetail} onClose={() => setSelectedCluster(null)} />
      )}

      {/* 创建/编辑集群 Dialog */}
      <KubernetesClusterDialog
        open={dialogOpen}
        onOpenChange={setDialogOpen}
        editingCluster={editingCluster}
        onSaved={handleSaved}
      />

      {/* kubectl 终端 */}
      {kubectlCluster && (
        <KubectlTerminal
          open={kubectlTerminalOpen}
          onOpenChange={(open) => {
            setKubectlTerminalOpen(open);
            if (!open) setKubectlCluster(null);
          }}
          clusterId={kubectlCluster.id}
          clusterName={kubectlCluster.name}
        />
      )}

      {/* 导出资源弹窗 */}
      {exportCluster && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60" onClick={() => setExportCluster(null)}>
          <div className="bg-slate-900 border border-slate-700 rounded-lg p-5 w-96 shadow-xl" onClick={(e) => e.stopPropagation()}>
            <h3 className="text-base font-semibold text-slate-100 mb-1">导出集群资源</h3>
            <p className="text-xs text-slate-400 mb-4">
              导出 {exportCluster.name} 所有命名空间的 Deployment、Service、Ingress、ConfigMap、Secret 为 tar.gz
            </p>
            <div className="flex justify-end gap-2">
              <Button variant="outline" className="border-slate-700 text-slate-300" onClick={() => setExportCluster(null)}>取消</Button>
              <Button className="bg-blue-600 hover:bg-blue-700 text-white" onClick={handleExport} disabled={exporting}>
                {exporting ? '导出中...' : '确认导出'}
              </Button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}