package operation

import (
  "bytes"
  "encoding/json"
  "mime/multipart"
  "net/http"
  _ "fmt"
  "io"
  "io/ioutil"
)

type UploadResult struct {
  Size int
}

func Upload(server string, fid string, filename string, reader io.Reader) (*UploadResult, error) {
  body_buf := bytes.NewBufferString("")
  body_writer := multipart.NewWriter(body_buf)
  file_writer, err := body_writer.CreateFormFile("file", filename)
  io.Copy(file_writer, reader)
  content_type := body_writer.FormDataContentType()
  body_writer.Close()
  resp, err := http.Post("http://"+server+"/"+fid, content_type, body_buf)
  if err != nil {
    return nil, err
  }
  defer resp.Body.Close()
  resp_body, err := ioutil.ReadAll(resp.Body)
  if err != nil {
    return nil, err
  }
  var ret UploadResult
  err = json.Unmarshal(resp_body, &ret)
  if err != nil {
    panic(err.Error())
  }
  //fmt.Println("Uploaded " + strconv.Itoa(ret.Size) + " Bytes to " + uploadUrl)
  return &ret, nil
}