##
# Uploads multiple files via FTP using the LFTP command
#
# @usage
#   send_files john john123456 20 ftp.foo.com /home/john/remote/dir /tmp/a /tmp/b /tmp/c
#   send_files john john123456 20 ftp.foo.com /home/john/remote/dir $file_list
#
# @param $1 Usuário FTP
# @param $2 Senha FTP
# @param $3 Porta FTP
# @param $4 Host FTP
# @param $5 Remote destination directory
# @param $6 Files to upload
function ftp_send_files(){
  # we use the 'shift' command to trim up all
  # of the parameters until the last one (files)
  # so that we could use it as a variadic trailing argument
  local user="$1"; shift
  local password="$1"; shift
  local port="$1"; shift
  local host="$1"; shift
  local remote_dir="$1"; shift
  local files="$@"

  local ftp_cmd="set ftp:ssl-allow true"
  ftp_cmd+="  && set ftp:ssl-force true "
  ftp_cmd+="  && set ftp:ssl-protect-data true "
  ftp_cmd+="  && set ftp:ssl-protect-list true "
  ftp_cmd+="  && set ssl:verify-certificate false "
  ftp_cmd+="  && open -u $user,$password -p $port $host "
  ftp_cmd+="  && mput -O $remote_dir $files "

  lftp -c "$ftp_cmd"
}

##
# Mirrors a remote FTP directory to a local directory
# the using LFTP command. In other words, it downloads
# all files from a remote FTP directory to a local directory.
#
# @usage
#   send_files john john123456 20 ftp.foo.com /home/john/remote/dir /tmp/john-sync
#
# @param $1 Usuário FTP
# @param $2 Senha FTP
# @param $3 Porta FTP
# @param $4 Host FTP
# @param $5 Remote origin directory
# @param $6 Local destination directory
function ftp_mirror_directory(){
  local user="$1"
  local password="$2"
  local port="$3"
  local host="$4"
  local remote_dir="$5"
  local local_dir="$6"

  local ftp_cmd="set ftp:ssl-allow true"
  ftp_cmd+="  && set ftp:ssl-force true "
  ftp_cmd+="  && set ftp:ssl-protect-data true "
  ftp_cmd+="  && set ftp:ssl-protect-list true "
  ftp_cmd+="  && set ssl:verify-certificate false "
  ftp_cmd+="  && open -u $user,$password -p $port $host "
  ftp_cmd+="  && mirror -c --parallel=3 $remote_dir $local_dir "

  lftp -c "$ftp_cmd"
}