import React, { useState, useCallback } from 'react';
import { Button } from '@/client/components/ui/button';
import { Card, CardContent } from '@/client/components/ui/card';
import { Progress } from '@/client/components/ui/progress';
import { Badge } from '@/client/components/ui/badge';
import { toast } from 'sonner';
import { Upload, X, CheckCircle, Loader2, FileText } from 'lucide-react';
import { uploadMinIOWithPolicy, MinioProgressEvent } from '@/client/utils/minio';
import type { UploadRequestOption } from 'rc-upload/lib/interface';
import type { RcFile } from 'rc-upload/lib/interface';

interface MinioUploaderProps {
  /** 上传路径 */
  uploadPath: string;
  /** 允许的文件类型，如['image/*', '.pdf'] */
  accept?: string;
  /** 最大文件大小(MB) */
  maxSize?: number;
  /** 是否允许多文件上传 */
  multiple?: boolean;
  /** 上传成功回调 */
  onUploadSuccess?: (fileKey: string, fileUrl: string, file: File) => void;
  /** 上传失败回调 */
  onUploadError?: (error: Error, file: File) => void;
  /** 自定义上传按钮文本 */
  buttonText?: string;
  /** 自定义提示文本 */
  tipText?: string;
}

// 定义上传文件状态
interface UploadFile {
  uid: string;
  name: string;
  size: number;
  type?: string;
  status: 'uploading' | 'success' | 'error';
  percent: number;
  error?: string;
  url?: string;
}

const MinioUploader: React.FC<MinioUploaderProps> = ({
  uploadPath = '/',
  accept,
  maxSize = 500, // 默认最大500MB
  multiple = false,
  onUploadSuccess,
  onUploadError,
  buttonText = '点击或拖拽上传文件',
  tipText = '支持单文件或多文件上传，单个文件大小不超过500MB'
}) => {
  const [fileList, setFileList] = useState<UploadFile[]>([]);
  const [uploadingFiles, setUploadingFiles] = useState<Set<string>>(new Set());
  const [dragActive, setDragActive] = useState(false);

  // 处理上传进度
  const handleProgress = useCallback((uid: string, event: MinioProgressEvent) => {
    setFileList(prev => 
      prev.map(item => {
        if (item.uid === uid) {
          return {
            ...item,
            status: event.stage === 'error' ? 'error' : 'uploading',
            percent: event.progress,
            error: event.stage === 'error' ? event.message : undefined
          };
        }
        return item;
      })
    );
  }, []);

  // 处理上传成功
  const handleComplete = useCallback((uid: string, result: { fileKey: string; fileUrl: string }, file: File) => {
    setFileList(prev => 
      prev.map(item => {
        if (item.uid === uid) {
          return {
            ...item,
            status: 'success',
            percent: 100,
            url: result.fileUrl,
          };
        }
        return item;
      })
    );
    
    setUploadingFiles(prev => {
      const newSet = new Set(prev);
      newSet.delete(uid);
      return newSet;
    });
    
    toast.success(`文件 "${file.name}" 上传成功`);
    onUploadSuccess?.(result.fileKey, result.fileUrl, file);
  }, [onUploadSuccess]);

  // 处理上传失败
  const handleError = useCallback((uid: string, error: Error, file: File) => {
    setFileList(prev => 
      prev.map(item => {
        if (item.uid === uid) {
          return {
            ...item,
            status: 'error',
            percent: 0,
            error: error.message || '上传失败'
          };
        }
        return item;
      })
    );
    
    setUploadingFiles(prev => {
      const newSet = new Set(prev);
      newSet.delete(uid);
      return newSet;
    });
    
    toast.error(`文件 "${file.name}" 上传失败: ${error.message}`);
    onUploadError?.(error, file);
  }, [onUploadError]);

  // 自定义上传逻辑
  const handleUpload = async (file: File) => {
    const uid = Date.now().toString() + Math.random().toString(36).substr(2, 9);
    
    // 添加到文件列表
    setFileList(prev => [
      ...prev,
      {
        uid,
        name: file.name,
        size: file.size,
        type: file.type,
        status: 'uploading',
        percent: 0,
      }
    ]);
    
    // 添加到上传中集合
    setUploadingFiles(prev => new Set(prev).add(uid));
    
    try {
      // 验证文件大小
      const fileSizeMB = file.size / (1024 * 1024);
      if (fileSizeMB > maxSize) {
        throw new Error(`文件大小超过 ${maxSize}MB 限制`);
      }
      
      // 调用minio上传方法
      const result = await uploadMinIOWithPolicy(
        uploadPath,
        file,
        file.name,
        {
          onProgress: (event) => handleProgress(uid, event),
          signal: new AbortController().signal
        }
      );
      
      handleComplete(uid, result, file);
    } catch (error) {
      handleError(uid, error instanceof Error ? error : new Error('未知错误'), file);
    }
  };

  // 处理文件选择
  const handleFileSelect = (files: FileList) => {
    if (!files || files.length === 0) return;

    const fileArray = Array.from(files);
    
    if (!multiple && fileArray.length > 1) {
      toast.error('不支持多文件上传');
      return;
    }

    fileArray.forEach(file => handleUpload(file));
  };

  // 处理拖拽
  const handleDrag = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    
    if (e.type === 'dragenter' || e.type === 'dragover') {
      setDragActive(true);
    } else if (e.type === 'dragleave') {
      setDragActive(false);
    }
  };

  const handleDrop = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    setDragActive(false);
    
    const files = e.dataTransfer.files;
    handleFileSelect(files);
  };

  // 处理文件移除
  const handleRemove = (uid: string) => {
    setFileList(prev => prev.filter(item => item.uid !== uid));
  };

  // 渲染上传状态
  const renderUploadStatus = (item: UploadFile) => {
    switch (item.status) {
      case 'uploading':
        return (
          <div className="flex items-center gap-2">
            <Loader2 className="h-4 w-4 animate-spin" />
            <span className="text-sm">{Math.round(item.percent)}%</span>
          </div>
        );
      case 'success':
        return (
          <div className="flex items-center gap-2">
            <CheckCircle className="h-4 w-4 text-green-500" />
            <Badge variant="outline" className="bg-green-50 text-green-700 border-green-200">
              上传成功
            </Badge>
          </div>
        );
      case 'error':
        return (
          <div className="flex items-center gap-2">
            <div className="h-4 w-4 text-red-500">×</div>
            <Badge variant="outline" className="bg-red-50 text-red-700 border-red-200">
              {item.error || '上传失败'}
            </Badge>
          </div>
        );
      default:
        return null;
    }
  };

  // 渲染文件图标
  const renderFileIcon = (type?: string) => {
    if (type?.startsWith('image/')) {
      return <FileText className="h-8 w-8 text-blue-500" />;
    } else if (type?.startsWith('video/')) {
      return <FileText className="h-8 w-8 text-red-500" />;
    } else if (type?.startsWith('audio/')) {
      return <FileText className="h-8 w-8 text-purple-500" />;
    } else if (type?.includes('pdf')) {
      return <FileText className="h-8 w-8 text-red-500" />;
    } else if (type?.includes('word')) {
      return <FileText className="h-8 w-8 text-blue-600" />;
    } else if (type?.includes('excel') || type?.includes('sheet')) {
      return <FileText className="h-8 w-8 text-green-500" />;
    } else {
      return <FileText className="h-8 w-8 text-gray-500" />;
    }
  };

  return (
    <div className="space-y-4">
      {/* 拖拽上传区域 */}
      <div
        className={`relative border-2 border-dashed rounded-lg p-6 transition-all ${
          dragActive 
            ? 'border-primary bg-primary/5' 
            : 'border-gray-300 hover:border-primary/50'
        }`}
        onDragEnter={handleDrag}
        onDragLeave={handleDrag}
        onDragOver={handleDrag}
        onDrop={handleDrop}
      >
        <div className="flex flex-col items-center justify-center space-y-4">
          <Upload className={`h-12 w-12 ${dragActive ? 'text-primary' : 'text-gray-400'}`} />
          <div className="text-center">
            <p className="text-lg font-medium">{buttonText}</p>
            <p className="text-sm text-gray-500 mt-1">{tipText}</p>
          </div>
          <Button
            type="button"
            variant="outline"
            onClick={() => {
              const input = document.createElement('input');
              input.type = 'file';
              input.accept = accept || '';
              input.multiple = multiple;
              input.onchange = (e) => {
                const files = (e.target as HTMLInputElement).files;
                if (files) handleFileSelect(files);
              };
              input.click();
            }}
          >
            <Upload className="h-4 w-4 mr-2" />
            选择文件
          </Button>
        </div>
      </div>

      {/* 上传进度列表 */}
      {fileList.length > 0 && (
        <Card>
          <CardContent className="pt-6">
            <h3 className="text-lg font-semibold mb-4">上传进度</h3>
            <div className="space-y-4">
              {fileList.map(item => (
                <div key={item.uid} className="flex items-center space-x-4 p-4 border rounded-lg">
                  <div className="flex-shrink-0">
                    {renderFileIcon(item.type)}
                  </div>
                  <div className="flex-1 min-w-0">
                    <div className="flex justify-between items-center mb-2">
                      <p className="text-sm font-medium truncate">{item.name}</p>
                      <div className="flex items-center space-x-2">
                        {renderUploadStatus(item)}
                        <Button
                          variant="ghost"
                          size="sm"
                          onClick={() => handleRemove(item.uid)}
                          disabled={item.status === 'uploading'}
                        >
                          <X className="h-4 w-4" />
                        </Button>
                      </div>
                    </div>
                    {item.status === 'uploading' && (
                      <div className="space-y-2">
                        <Progress value={item.percent} className="h-2" />
                        <p className="text-xs text-gray-500">
                          {Math.round(item.percent)}% - {formatFileSize(item.size * (item.percent / 100))} / {formatFileSize(item.size)}
                        </p>
                      </div>
                    )}
                  </div>
                </div>
              ))}
            </div>
          </CardContent>
        </Card>
      )}
    </div>
  );
};

// 辅助函数：格式化文件大小
const formatFileSize = (bytes: number): string => {
  if (bytes === 0) return '0 Bytes';
  const k = 1024;
  const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
};

export default MinioUploader;