import axios from 'axios'
import { message } from 'ant-design-vue'

const API_BASE = (import.meta as any).env?.VITE_API_BASE_URL || '/api'

export interface FileUpload {
  id: number
  originalName: string
  storedName: string
  filePath: string
  fileUrl: string
  fileSize: number
  fileType: string
  uploaderId: number
  uploaderName: string
  relatedType?: string
  relatedId?: number
  createTime: string
}

/**
 * 上传文件到S3
 * @param files 文件列表
 * @param relatedType 关联类型（可选，如 'task'）
 * @param relatedId 关联ID（可选）
 * @param onProgress 上传进度回调
 */
export const uploadFilesToS3 = async (
  files: File[],
  relatedType?: string,
  relatedId?: number,
  onProgress?: (progress: number) => void
): Promise<string[]> => {
  console.log('[uploadFilesToS3] 开始上传，文件数量:', files.length, 'relatedType:', relatedType, 'relatedId:', relatedId)
  
  const formData = new FormData()
  files.forEach((file, index) => {
    console.log(`[uploadFilesToS3] 添加文件 ${index + 1}:`, file.name, file.size, file.type)
    formData.append('files', file)
  })
  if (relatedType) {
    formData.append('relatedType', relatedType)
  }
  if (relatedId) {
    formData.append('relatedId', relatedId.toString())
  }

  const token = localStorage.getItem('token')
  console.log('[uploadFilesToS3] Token存在:', !!token)
  console.log('[uploadFilesToS3] 请求URL:', `${API_BASE}/file/upload`)

  return new Promise((resolve, reject) => {
    console.log('[uploadFilesToS3] 发送POST请求到:', `${API_BASE}/file/upload`)
    axios.post<{ code: number; message: string; data: string[] }>(
      `${API_BASE}/file/upload`,
      formData,
      {
        headers: {
          'Content-Type': 'multipart/form-data',
          'Authorization': token ? `Bearer ${token}` : ''
        },
        onUploadProgress: (progressEvent) => {
          if (onProgress && progressEvent.total) {
            const percent = Math.round((progressEvent.loaded * 100) / progressEvent.total)
            onProgress(percent)
          }
        }
      }
    )
      .then(response => {
        console.log('[uploadFilesToS3] 上传响应:', response.data)
        if (response.data.code === 200 && response.data.data) {
          console.log('[uploadFilesToS3] 上传成功，文件URLs:', response.data.data)
          resolve(response.data.data)
        } else {
          console.error('[uploadFilesToS3] 上传失败，响应:', response.data)
          message.error(response.data.message || '上传失败')
          reject(new Error(response.data.message || '上传失败'))
        }
      })
      .catch(error => {
        console.error('[uploadFilesToS3] 上传异常:', error)
        console.error('[uploadFilesToS3] 错误详情:', {
          message: error.message,
          response: error.response?.data,
          status: error.response?.status
        })
        const errorMsg = error.response?.data?.message || error.message || '上传失败'
        message.error(errorMsg)
        reject(new Error(errorMsg))
      })
  })
}

/**
 * 下载文件（需要登录）
 * @param fileId 文件ID
 */
export const downloadFile = (fileId: number) => {
  const token = localStorage.getItem('token')
  const url = `${API_BASE}/file/download/${fileId}`
  
  // 创建隐藏的a标签进行下载
  const link = document.createElement('a')
  link.href = url
  link.style.display = 'none'
  
  // 添加Authorization header（通过fetch实现）
  fetch(url, {
    headers: {
      'Authorization': token ? `Bearer ${token}` : ''
    }
  })
    .then(response => {
      if (response.ok) {
        return response.blob()
      } else {
        throw new Error('下载失败')
      }
    })
    .then(blob => {
      const downloadUrl = window.URL.createObjectURL(blob)
      link.href = downloadUrl
      link.download = ''
      document.body.appendChild(link)
      link.click()
      document.body.removeChild(link)
      window.URL.revokeObjectURL(downloadUrl)
    })
    .catch(error => {
      message.error('文件下载失败: ' + error.message)
    })
}

/**
 * 获取文件信息
 */
export const getFileInfo = (fileId: number): Promise<FileUpload> => {
  return axios.get(`${API_BASE}/file/${fileId}`, {
    headers: {
      'Authorization': `Bearer ${localStorage.getItem('token')}`
    }
  }).then(response => {
    if (response.data.code === 200) {
      return response.data.data
    } else {
      throw new Error(response.data.message || '获取文件信息失败')
    }
  })
}

/**
 * 根据关联信息获取文件列表
 */
export const getFilesByRelated = (relatedType: string, relatedId: number): Promise<FileUpload[]> => {
  return axios.get(`${API_BASE}/file/list`, {
    params: { relatedType, relatedId },
    headers: {
      'Authorization': `Bearer ${localStorage.getItem('token')}`
    }
  }).then(response => {
    if (response.data.code === 200) {
      return response.data.data
    } else {
      throw new Error(response.data.message || '获取文件列表失败')
    }
  })
}

/**
 * 直接打开文件URL（用于S3公开URL）
 * @param fileUrl 文件URL
 */
export const openFileUrl = (fileUrl: string) => {
  window.open(fileUrl, '_blank')
}