// PodFileBrowser.tsx — Pod 容器文件浏览器组件
// 作者: Logan <admin@attacker.club>
import { useState, useEffect, useCallback, useRef } from 'react';
import { kubernetesApi } from '@/services/api';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Input } from '@/components/ui/input';
import {
  Loader2, X, Folder, File, ChevronRight, ChevronDown,
  Download, Upload, RefreshCw, ArrowLeft, HardDrive,
} from 'lucide-react';

export interface PodFileBrowserProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  clusterCode: string;
  namespace: string;
  podName: string;
  containers?: string[];
  initialContainer?: string;
}

interface FileEntry {
  name: string;
  isDir: boolean;
  size?: number;
  modTime?: string;
}

export function PodFileBrowser({
  open, onOpenChange, clusterCode, namespace, podName, containers = [], initialContainer,
}: PodFileBrowserProps) {
  const [container, setContainer] = useState(initialContainer || containers[0] || '');
  const [currentPath, setCurrentPath] = useState('/');
  const [entries, setEntries] = useState<FileEntry[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');
  const [preview, setPreview] = useState<{ file: string; content: string } | null>(null);
  const [uploading, setUploading] = useState(false);
  const fileInputRef = useRef<HTMLInputElement>(null);

  const loadFiles = useCallback(async (path: string) => {
    setLoading(true);
    setError('');
    setPreview(null);
    try {
      const res: any = await kubernetesApi.listPodFiles(clusterCode, namespace, podName, path, container || undefined);
      // 兼容后端 {files: [...]} 和 {entries: [...]} 两种返回格式
      const raw: any[] = res?.entries || res?.files || res?.data?.entries || res?.data?.files || (Array.isArray(res) ? res : []);
      const list: FileEntry[] = raw.map((it: any) => ({
        name: it.name ?? it.Name ?? '',
        isDir: Boolean(it.isDir ?? it.is_dir ?? it.IsDir ?? it.dir ?? it.directory),
        size: typeof it.size === 'number' ? it.size : (it.Size ? Number(it.Size) : undefined),
        modTime: it.modTime ?? it.mod_time ?? it.ModTime ?? it.mtime ?? it.modified,
      })).filter(e => e.name && e.name !== '.');
      setEntries(list);
      setCurrentPath(path);
    } catch (e: any) {
      setError(e.message || '加载文件列表失败');
      setEntries([]);
    } finally {
      setLoading(false);
    }
  }, [clusterCode, namespace, podName, container]);

  useEffect(() => {
    if (open) loadFiles('/');
  }, [open, loadFiles]);

  const handleClick = (entry: FileEntry) => {
    if (entry.isDir) {
      const newPath = currentPath === '/' ? `/${entry.name}` : `${currentPath}/${entry.name}`;
      loadFiles(newPath);
    } else {
      handlePreview(entry.name);
    }
  };

  const handlePreview = async (fileName: string) => {
    const filePath = currentPath === '/' ? `/${fileName}` : `${currentPath}/${fileName}`;
    try {
      const text = await kubernetesApi.readPodFileText(clusterCode, namespace, podName, filePath, container || undefined);
      setPreview({ file: fileName, content: text });
    } catch (e: any) {
      setPreview({ file: fileName, content: `读取失败: ${e.message}` });
    }
  };

  const handleDownload = (fileName: string) => {
    const filePath = currentPath === '/' ? `/${fileName}` : `${currentPath}/${fileName}`;
    const url = kubernetesApi.buildPodFileDownloadUrl(clusterCode, namespace, podName, filePath, container || undefined);
    window.open(url, '_blank');
  };

  const handleUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;
    setUploading(true);
    try {
      await kubernetesApi.uploadPodFile(clusterCode, namespace, podName, currentPath, file, container || undefined);
      loadFiles(currentPath);
    } catch (err: any) {
      setError(`上传失败: ${err.message}`);
    } finally {
      setUploading(false);
      if (fileInputRef.current) fileInputRef.current.value = '';
    }
  };

  const handleGoUp = () => {
    if (currentPath === '/') return;
    const parts = currentPath.split('/').filter(Boolean);
    parts.pop();
    loadFiles(parts.length === 0 ? '/' : `/${parts.join('/')}`);
  };

  const formatSize = (bytes?: number) => {
    if (bytes == null) return '-';
    if (bytes < 1024) return `${bytes} B`;
    if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
    return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
  };

  const pathSegments = currentPath.split('/').filter(Boolean);

  if (!open) return null;

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/70" onClick={() => onOpenChange(false)}>
      <div
        className="bg-slate-900 border border-slate-700 rounded-xl w-[90vw] max-w-5xl h-[80vh] flex flex-col shadow-2xl"
        onClick={(e) => e.stopPropagation()}
      >
        {/* Header */}
        <div className="flex items-center justify-between p-3 border-b border-slate-700 shrink-0">
          <div className="flex items-center gap-2">
            <HardDrive className="h-4 w-4 text-amber-400" />
            <span className="text-sm font-semibold text-slate-200">文件浏览器: {podName}</span>
            <Badge variant="outline" className="border-slate-700 text-slate-400 text-[10px]">{namespace}</Badge>
          </div>
          <div className="flex items-center gap-2">
            {containers.length > 0 && (
              <select
                value={container}
                onChange={(e) => { setContainer(e.target.value); }}
                className="bg-slate-800 border border-slate-700 rounded text-xs text-slate-300 px-2 py-1"
              >
                {containers.map((c) => <option key={c} value={c}>{c}</option>)}
              </select>
            )}
            <Button variant="ghost" size="icon" className="h-7 w-7 text-slate-400" onClick={() => onOpenChange(false)}>
              <X className="h-4 w-4" />
            </Button>
          </div>
        </div>

        {/* Breadcrumb + Actions */}
        <div className="flex items-center justify-between p-2 border-b border-slate-800 shrink-0">
          <div className="flex items-center gap-1 text-xs text-slate-400">
            <Button variant="ghost" size="icon" className="h-6 w-6 text-slate-500" onClick={handleGoUp} disabled={currentPath === '/'}>
              <ArrowLeft className="h-3.5 w-3.5" />
            </Button>
            <button className="hover:text-slate-200" onClick={() => loadFiles('/')}>root</button>
            {pathSegments.map((seg, i) => {
              const path = `/${pathSegments.slice(0, i + 1).join('/')}`;
              return (
                <span key={path} className="flex items-center gap-1">
                  <ChevronRight className="h-3 w-3" />
                  <button className="hover:text-slate-200" onClick={() => loadFiles(path)}>{seg}</button>
                </span>
              );
            })}
          </div>
          <div className="flex items-center gap-2">
            <input type="file" ref={fileInputRef} className="hidden" onChange={handleUpload} />
            <Button size="sm" variant="outline" className="h-7 border-slate-700 text-slate-300 text-xs" onClick={() => fileInputRef.current?.click()} disabled={uploading}>
              {uploading ? <Loader2 className="h-3 w-3 animate-spin mr-1" /> : <Upload className="h-3 w-3 mr-1" />}上传
            </Button>
            <Button size="sm" variant="outline" className="h-7 border-slate-700 text-slate-300 text-xs" onClick={() => loadFiles(currentPath)} disabled={loading}>
              {loading ? <Loader2 className="h-3 w-3 animate-spin" /> : <RefreshCw className="h-3 w-3" />}
            </Button>
          </div>
        </div>

        {/* Content */}
        <div className="flex-1 overflow-hidden flex">
          {/* File list */}
          <div className={`${preview ? 'w-1/2' : 'w-full'} overflow-auto p-2 border-r border-slate-800`}>
            {error && <p className="text-xs text-red-400 p-2">{error}</p>}
            {loading ? (
              <div className="flex items-center justify-center h-32"><Loader2 className="h-5 w-5 animate-spin text-slate-500" /></div>
            ) : entries.length === 0 ? (
              <p className="text-xs text-slate-500 p-4 text-center">空目录</p>
            ) : (
              <div className="space-y-0.5">
                {entries.sort((a, b) => (a.isDir === b.isDir ? a.name.localeCompare(b.name) : a.isDir ? -1 : 1)).map((entry) => (
                  <div
                    key={entry.name}
                    className="flex items-center gap-2 px-2 py-1.5 rounded hover:bg-slate-800/50 cursor-pointer group"
                    onClick={() => handleClick(entry)}
                  >
                    {entry.isDir ? (
                      <Folder className="h-4 w-4 text-blue-400 shrink-0" />
                    ) : (
                      <File className="h-4 w-4 text-slate-500 shrink-0" />
                    )}
                    <span className={`text-xs truncate ${entry.isDir ? 'text-blue-300' : 'text-slate-300'}`}>
                      {entry.name}
                    </span>
                    {!entry.isDir && (
                      <span className="text-[10px] text-slate-600 ml-auto shrink-0">{formatSize(entry.size)}</span>
                    )}
                    {!entry.isDir && (
                      <Button
                        variant="ghost" size="icon" className="h-5 w-5 opacity-0 group-hover:opacity-100 text-slate-400 hover:text-emerald-400 shrink-0"
                        onClick={(e) => { e.stopPropagation(); handleDownload(entry.name); }}
                        title="下载"
                      >
                        <Download className="h-3 w-3" />
                      </Button>
                    )}
                  </div>
                ))}
              </div>
            )}
          </div>

          {/* Preview */}
          {preview && (
            <div className="w-1/2 flex flex-col overflow-hidden">
              <div className="flex items-center justify-between p-2 border-b border-slate-800 shrink-0">
                <span className="text-xs text-slate-300 font-mono">{preview.file}</span>
                <Button variant="ghost" size="icon" className="h-6 w-6 text-slate-400" onClick={() => setPreview(null)}>
                  <X className="h-3.5 w-3.5" />
                </Button>
              </div>
              <div className="flex-1 overflow-auto p-3">
                <pre className="text-xs text-slate-300 font-mono whitespace-pre-wrap break-all bg-slate-950 rounded p-3">
                  {preview.content || '(空文件)'}
                </pre>
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}