#!/bin/bash
set -e

############################################################
# Help                                                     #
############################################################
help()
{
   # Display Help
   echo "Send files or text with PairDrop via command-line interface."
   echo "Current domain: ${DOMAIN}"
   echo
   echo "Usage:"
   echo -e "Open PairDrop:\t\t$(basename "$0")"
   echo -e "Send files:\t\t$(basename "$0") file/directory"
   echo -e "Send text:\t\t$(basename "$0") -t \"text\""
   echo -e "Specify domain:\t\t$(basename "$0") -d \"https://pairdrop.net/\""
   echo -e "Show this help text:\t$(basename "$0") (-h|--help)"
}

openPairDrop()
{
  url="$DOMAIN"
  if [[ -n $params ]];then
    url="${url}?${params}"
  fi
  if [[ -n $hash ]];then
    url="${url}#${hash}"
  fi

  echo "PairDrop is opening at $DOMAIN"
  if [[ $OS == "Windows" ]];then
    start "$url"
  elif [[ $OS == "Mac" ]];then
    open "$url"
  elif [[ $OS == "WSL" || $OS == "WSL2" ]];then
    powershell.exe /c "Start-Process ${url}"
  else
    xdg-open "$url"
  fi
  exit
}

setOs()
{
  unameOut=$(uname -a)
  case "${unameOut}" in
      *Microsoft*)     OS="WSL";; #must be first since Windows subsystem for linux will have Linux in the name too
      *microsoft*)     OS="WSL2";; #WARNING: My v2 uses ubuntu 20.4 at the moment slightly different name may not always work
      Linux*)          OS="Linux";;
      Darwin*)         OS="Mac";;
      CYGWIN*)         OS="Cygwin";;
      MINGW*)          OS="Windows";;
      *Msys)           OS="Windows";;
      *)               OS="UNKNOWN:${unameOut}"
  esac
}

specifyDomain()
{
  [[ ! $1 = http* ]] || [[ ! $1 = */ ]] && echo "Incorrect format. Specify domain like https://pairdrop.net/" && exit
  echo "DOMAIN=${1}" > "$CONFIGPATH"
  echo -e "Domain is now set to:\n$1\n"
}

sendText()
{
    params="base64text=hash"
    hash=$(echo -n "${OPTARG}" | base64)

    if [[ $(echo -n "$hash" | wc -m) -gt 32600 ]];then
      params="base64text=paste"
      if [[ $OS == "Windows" || $OS == "WSL" || $OS == "WSL2" ]];then
        echo -n "$hash" | clip.exe
      elif [[ $OS == "Mac" ]];then
        echo -n "$hash" | pbcopy
      else
        (echo -n "$hash" | xclip) || echo "You need to install xclip for sending bigger files from cli"
      fi
      hash=
    fi

    openPairDrop
    exit
}

sendFiles()
{
  params="base64zip=hash"
  if [[ $1 == */ ]]; then
    path="${1::-1}"
  else
    path=$1
  fi
  zipPath="${path}_pairdrop.zip"
  zipPath=${zipPath// /_}

  [[ -a "$zipPath" ]] && echo "Cannot overwrite $zipPath. Please remove first." && exit

  if [[ -d $path ]]; then
    zipPathTemp="temp_${zipPath}"
    [[ -a "$zipPathTemp" ]] && echo "Cannot overwrite $zipPathTemp. Please remove first." && exit
    echo "Processing directory..."

    # Create zip files temporarily to send directory
    zip -q -b /tmp/ -r "$zipPath" "$path"
    zip -q -b /tmp/ "$zipPathTemp" "$zipPath"

    hash=$(base64 -w 0 "$zipPathTemp")

    # remove temporary temp file
    rm "$zipPathTemp"
  else
    echo "Processing file..."

    # Create zip file temporarily to send file
    zip -q -b /tmp/ "$zipPath" "$path"

    hash=$(base64 -w 0 "$zipPath")
  fi

  # remove temporary temp file
  rm "$zipPath"

  if [[ $(echo -n "$hash" | wc -m) -gt 32600 ]];then
    params="base64zip=paste"
    if [[ $OS == "Windows" || $OS == "WSL" || $OS == "WSL2" ]];then
      echo -n "$hash" | clip.exe
    elif [[ $OS == "Mac" ]];then
      echo -n "$hash" | pbcopy
    else
      (echo -n "$hash" | xclip) || echo "You need to install xclip for sending bigger files from cli"
    fi
    hash=
  fi

  openPairDrop
  exit
}

############################################################
############################################################
# Main program                                             #
############################################################
############################################################
SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"

pushd . > '/dev/null';
SCRIPTPATH="${BASH_SOURCE[0]:-$0}";

while [ -h "$SCRIPTPATH" ];
do
    cd "$( dirname -- "$SCRIPTPATH"; )";
    SCRIPTPATH="$( readlink -f -- "$SCRIPTPATH"; )";
done

cd "$( dirname -- "$SCRIPTPATH"; )" > '/dev/null';
SCRIPTPATH="$( pwd; )";
popd  > '/dev/null';

CONFIGPATH="${SCRIPTPATH}/.pairdrop-cli-config"

[ ! -f "$CONFIGPATH" ] &&
 specifyDomain "https://pairdrop.net/" &&
 [ ! -f "$CONFIGPATH" ] &&
 echo "Could not create config file. Add 'DOMAIN=https://pairdrop.net/' to a file called .pairdrop-cli-config in the same file as this 'pairdrop' bash file"

[ ! -f "$CONFIGPATH" ] || export "$(grep -v '^#' "$CONFIGPATH" | xargs)"

setOs
############################################################
# Process the input options. Add options as needed.        #
############################################################
# Get the options
# open PairDrop if no options are given
[[ $# -eq 0 ]] && openPairDrop && exit

#  display help and exit if first argument is "--help" or more than 2 arguments are given
[ "$1" == "--help" ] || [[ $# -gt 2 ]] && help && exit

while getopts "d:ht:*" option; do
    case $option in
      d) # specify domain
        specifyDomain "$2"
        exit;;
      t) # Send text
        sendText
        exit;;
      h | ?) # display help and exit
        help
        exit;;
      esac
done

# Send file(s)
# display help and exit if 2 arguments are given or if file does not exist
[[ $# -eq 2 ]] || [[ ! -a $1 ]] && help && exit

sendFiles "$1"