import type { InferResponseType } from 'hono/client';
import Taro from '@tarojs/taro';
import { fileClient } from "../api";

export interface MinioProgressEvent {
  stage: 'uploading' | 'complete' | 'error';
  message: string;
  progress: number;
  details?: {
      loaded: number;
      total: number;
  };
  timestamp: number;
}

export interface MinioProgressCallbacks {
  onProgress?: (event: MinioProgressEvent) => void;
  onComplete?: () => void;
  onError?: (error: Error) => void;
  signal?: { aborted: boolean };
}

export interface UploadResult {
  fileUrl: string;
  fileKey: string;
  bucketName: string;
}

interface UploadPart {
  ETag: string;
  PartNumber: number;
}

interface UploadProgressDetails {
  partNumber: number;
  totalParts: number;
  partSize: number;
  totalSize: number;
  partProgress?: number;
}

type MinioMultipartUploadPolicy = InferResponseType<typeof fileClient["multipart-policy"]['$post'], 200>
type MinioUploadPolicy = InferResponseType<typeof fileClient["upload-policy"]['$post'], 200>

const PART_SIZE = 5 * 1024 * 1024; // 每部分5MB

export class TaroMinIOMultipartUploader {
  /**
   * 使用 Taro.uploadFile 分段上传文件到 MinIO
   */
  static async upload(
    policy: MinioMultipartUploadPolicy,
    filePath: string,
    key: string,
    callbacks?: MinioProgressCallbacks
  ): Promise<UploadResult> {
    const partSize = PART_SIZE;
    
    // 获取文件信息
    const fileInfo = await Taro.getFileSystemManager().getFileInfo({
      filePath
    });
    const totalSize = fileInfo.size;
    const totalParts = Math.ceil(totalSize / partSize);
    const uploadedParts: UploadPart[] = [];
    
    callbacks?.onProgress?.({
      stage: 'uploading',
      message: '准备上传文件...',
      progress: 0,
      details: {
        loaded: 0,
        total: totalSize
      },
      timestamp: Date.now()
    });
    
    // 分段上传
    for (let i = 0; i < totalParts; i++) {
      if (callbacks?.signal?.aborted) {
        throw new Error('上传已取消');
      }
      
      const start = i * partSize;
      const end = Math.min(start + partSize, totalSize);
      const partNumber = i + 1;
      
      try {
        // 读取文件片段
        const partData = await this.readFileSlice(filePath, start, end);
        
        const etag = await this.uploadPart(
          policy.partUrls[i],
          partData,
          callbacks,
          {
            partNumber,
            totalParts,
            partSize: end - start,
            totalSize
          }
        );
        
        uploadedParts.push({
          ETag: etag,
          PartNumber: partNumber
        });
        
        // 更新进度
        const progress = Math.round((end / totalSize) * 100);
        callbacks?.onProgress?.({
          stage: 'uploading',
          message: `上传文件片段 ${partNumber}/${totalParts}`,
          progress,
          details: {
            loaded: end,
            total: totalSize,
          },
          timestamp: Date.now()
        });
      } catch (error) {
        callbacks?.onError?.(error instanceof Error ? error : new Error(String(error)));
        throw error;
      }
    }
    
    // 完成上传
    try {
      await this.completeMultipartUpload(policy, key, uploadedParts);
      
      callbacks?.onProgress?.({
        stage: 'complete',
        message: '文件上传完成',
        progress: 100,
        timestamp: Date.now()
      });
      
      callbacks?.onComplete?.();
      return {
        fileUrl: `${policy.host}/${key}`,
        fileKey: key,
        bucketName: policy.bucket
      };
    } catch (error) {
      callbacks?.onError?.(error instanceof Error ? error : new Error(String(error)));
      throw error;
    }
  }
  
  // 读取文件片段
  private static readFileSlice(filePath: string, start: number, end: number): Promise<ArrayBuffer> {
    return new Promise((resolve, reject) => {
      const fs = Taro.getFileSystemManager();
      try {
        const fileData = fs.readFileSync(filePath, undefined, {
          position: start,
          length: end - start
        });
        resolve(fileData);
      } catch (error) {
        reject(error);
      }
    });
  }
  
  // 上传单个片段
  private static async uploadPart(
    uploadUrl: string,
    partData: ArrayBuffer,
    callbacks?: MinioProgressCallbacks,
    progressDetails?: UploadProgressDetails
  ): Promise<string> {
    return new Promise((resolve, reject) => {
      const uploadTask = Taro.uploadFile({
        url: uploadUrl,
        filePath: '',
        name: 'file',
        formData: {},
        header: {
          'Content-Type': 'application/octet-stream'
        },
        success: (res) => {
          if (res.statusCode >= 200 && res.statusCode < 300) {
            // 从响应头获取ETag
            const etag = res.header['ETag']?.replace(/"/g, '') || '';
            resolve(etag);
          } else {
            reject(new Error(`上传片段失败: ${res.statusCode} ${res.errMsg}`));
          }
        },
        fail: (error) => {
          reject(new Error(`上传片段失败: ${error.errMsg}`));
        }
      });
      
      // 由于小程序 uploadFile 不直接支持 ArrayBuffer，我们需要使用 putFile
      // 改用 fetch API 上传二进制数据
      this.uploadBinaryData(uploadUrl, partData)
        .then(resolve)
        .catch(reject);
    });
  }
  
  // 上传二进制数据
  private static async uploadBinaryData(uploadUrl: string, data: ArrayBuffer): Promise<string> {
    return new Promise((resolve, reject) => {
      Taro.request({
        url: uploadUrl,
        method: 'PUT',
        data: data,
        header: {
          'Content-Type': 'application/octet-stream'
        },
        success: (res) => {
          if (res.statusCode >= 200 && res.statusCode < 300) {
            const etag = res.header['ETag']?.replace(/"/g, '') || '';
            resolve(etag);
          } else {
            reject(new Error(`上传片段失败: ${res.statusCode}`));
          }
        },
        fail: (error) => {
          reject(new Error(`上传片段失败: ${error.errMsg}`));
        }
      });
    });
  }
  
  // 完成分段上传
  private static async completeMultipartUpload(
    policy: MinioMultipartUploadPolicy,
    key: string,
    uploadedParts: UploadPart[]
  ): Promise<void> {
    const response = await fileClient["multipart-complete"].$post({
      json: {
        bucket: policy.bucket,
        key,
        uploadId: policy.uploadId,
        parts: uploadedParts.map(part => ({ partNumber: part.PartNumber, etag: part.ETag }))
      }
    });
    
    if (!response.ok) {
      throw new Error(`完成分段上传失败: ${response.status} ${response.statusText}`);
    }
  }
}

export class TaroMinIOUploader {
  /**
   * 使用 Taro.uploadFile 上传文件到 MinIO
   */
  static async upload(
    policy: MinioUploadPolicy,
    filePath: string,
    key: string,
    callbacks?: MinioProgressCallbacks
  ): Promise<UploadResult> {
    // 获取文件信息
    const fileInfo = await Taro.getFileSystemManager().getFileInfo({
      filePath
    });
    const totalSize = fileInfo.size;
    
    callbacks?.onProgress?.({
      stage: 'uploading',
      message: '准备上传文件...',
      progress: 0,
      details: {
        loaded: 0,
        total: totalSize
      },
      timestamp: Date.now()
    });
    
    // 准备表单数据
    const formData: Record<string, any> = {};
    
    // 添加 MinIO 需要的字段
    Object.entries(policy.uploadPolicy).forEach(([k, value]) => {
      if (k !== 'key' && k !== 'host' && k !== 'prefix' && k !== 'ossType' && typeof value === 'string') {
        formData[k] = value;
      }
    });
    
    // 添加自定义 key 字段
    formData['key'] = key;
    
    return new Promise((resolve, reject) => {
      // 使用 Taro 的文件系统读取文件
      Taro.getFileSystemManager().readFile({
        filePath,
        success: (fileData) => {
          // 构建 FormData
          const formDataObj = new FormData();
          Object.entries(formData).forEach(([key, value]) => {
            formDataObj.append(key, value);
          });
          formDataObj.append('file', new Blob([fileData.data]));
          
          // 使用 Taro.request 上传
          Taro.request({
            url: policy.uploadPolicy.host,
            method: 'POST',
            data: formDataObj,
            header: {
              'Content-Type': 'multipart/form-data'
            },
            success: (res) => {
              if (res.statusCode >= 200 && res.statusCode < 300) {
                callbacks?.onProgress?.({
                  stage: 'complete',
                  message: '文件上传完成',
                  progress: 100,
                  timestamp: Date.now()
                });
                callbacks?.onComplete?.();
                resolve({
                  fileUrl: `${policy.uploadPolicy.host}/${key}`,
                  fileKey: key,
                  bucketName: policy.uploadPolicy.bucket
                });
              } else {
                const error = new Error(`上传失败: ${res.statusCode}`);
                callbacks?.onError?.(error);
                reject(error);
              }
            },
            fail: (error) => {
              const err = new Error(`上传失败: ${error.errMsg}`);
              callbacks?.onError?.(err);
              reject(err);
            }
          });
        },
        fail: (error) => {
          const err = new Error(`读取文件失败: ${error.errMsg}`);
          callbacks?.onError?.(err);
          reject(err);
        }
      });
      
      // 由于小程序限制，我们使用更简单的 uploadFile 方式
      // 但先保存临时文件
      this.uploadWithTempFile(policy, filePath, key, callbacks)
        .then(resolve)
        .catch(reject);
    });
  }
  
  private static async uploadWithTempFile(
    policy: MinioUploadPolicy,
    filePath: string,
    key: string,
    callbacks?: MinioProgressCallbacks
  ): Promise<UploadResult> {
    return new Promise((resolve, reject) => {
      // 由于小程序的 uploadFile 只支持文件路径，我们需要构建完整的 FormData
      // 这里使用 request 方式上传
      Taro.getFileSystemManager().readFile({
        filePath,
        success: (fileData) => {
          const formData = new FormData();
          
          // 添加所有必需的字段
          Object.entries(policy.uploadPolicy).forEach(([k, value]) => {
            if (k !== 'key' && k !== 'host' && k !== 'prefix' && k !== 'ossType' && typeof value === 'string') {
              formData.append(k, value);
            }
          });
          
          formData.append('key', key);
          formData.append('file', new Blob([fileData.data]));
          
          Taro.request({
            url: policy.uploadPolicy.host,
            method: 'POST',
            data: formData,
            header: {
              'Content-Type': 'multipart/form-data'
            },
            success: (res) => {
              if (res.statusCode >= 200 && res.statusCode < 300) {
                callbacks?.onProgress?.({
                  stage: 'complete',
                  message: '文件上传完成',
                  progress: 100,
                  timestamp: Date.now()
                });
                callbacks?.onComplete?.();
                resolve({
                  fileUrl: `${policy.uploadPolicy.host}/${key}`,
                  fileKey: key,
                  bucketName: policy.uploadPolicy.bucket
                });
              } else {
                reject(new Error(`上传失败: ${res.statusCode}`));
              }
            },
            fail: (error) => {
              reject(new Error(`上传失败: ${error.errMsg}`));
            }
          });
        },
        fail: (error) => {
          reject(new Error(`读取文件失败: ${error.errMsg}`));
        }
      });
    });
  }
}

export async function getUploadPolicy(key: string, fileName: string, fileType?: string, fileSize?: number): Promise<MinioUploadPolicy> {
  const policyResponse = await fileClient["upload-policy"].$post({
    json: {
      path: key,
      name: fileName,
      type: fileType,
      size: fileSize
    }
  });
  if (!policyResponse.ok) {
    throw new Error('获取上传策略失败');
  }
  return policyResponse.json();
}

export async function getMultipartUploadPolicy(totalSize: number, fileKey: string, fileType?: string, fileName: string = 'unnamed-file') {
  const policyResponse = await fileClient["multipart-policy"].$post({
    json: {
      totalSize,
      partSize: PART_SIZE,
      fileKey,
      type: fileType,
      name: fileName
    }
  });
  if (!policyResponse.ok) {
    throw new Error('获取分段上传策略失败');
  }
  return await policyResponse.json();
}

export async function uploadMinIOWithPolicy(
  uploadPath: string,
  filePath: string,
  fileKey: string,
  callbacks?: MinioProgressCallbacks
): Promise<UploadResult> {
  if(uploadPath === '/') uploadPath = '';
  else{
    if(!uploadPath.endsWith('/')) uploadPath = `${uploadPath}/`
    // 去掉开头的 /
    if(uploadPath.startsWith('/')) uploadPath = uploadPath.replace(/^\//, '');
  }
  
  // 获取文件信息
  const fileInfo = await Taro.getFileSystemManager().getFileInfo({
    filePath
  });
  const fileSize = fileInfo.size;
  
  if(fileSize > PART_SIZE) {
    const policy = await getMultipartUploadPolicy(
      fileSize,
      `${uploadPath}${fileKey}`,
      undefined,
      fileKey
    );
    return TaroMinIOMultipartUploader.upload(
      policy,
      filePath,
      policy.key,
      callbacks
    );
  } else {
    const policy = await getUploadPolicy(`${uploadPath}${fileKey}`, fileKey, undefined, fileSize);
    return TaroMinIOUploader.upload(policy, filePath, policy.uploadPolicy.key, callbacks);
  }
}

// 新增：小程序专用的上传函数
export async function uploadMinIOWithTaroFile(
  uploadPath: string,
  tempFilePath: string,
  fileName: string,
  callbacks?: MinioProgressCallbacks
): Promise<UploadResult> {
  const fileKey = `${Date.now()}-${Math.random().toString(36).substr(2, 9)}-${fileName}`;
  return uploadMinIOWithPolicy(uploadPath, tempFilePath, fileKey, callbacks);
}

// 新增：从 chooseImage 或 chooseVideo 获取文件
export async function uploadFromChoose(
  sourceType: ('album' | 'camera')[] = ['album', 'camera'],
  uploadPath: string = '',
  callbacks?: MinioProgressCallbacks
): Promise<UploadResult> {
  return new Promise((resolve, reject) => {
    Taro.chooseImage({
      count: 1,
      sourceType,
      success: async (res) => {
        const tempFilePath = res.tempFilePaths[0];
        const fileName = res.tempFiles[0]?.name || tempFilePath.split('/').pop() || 'unnamed-file';
        
        try {
          const result = await uploadMinIOWithPolicy(uploadPath, tempFilePath, fileName, callbacks);
          resolve(result);
        } catch (error) {
          reject(error);
        }
      },
      fail: reject
    });
  });
}