#!/bin/sh

# Inspired from
# https://blog.flo.cx/2011/02/how-to-open-magnet-links-on-a-remote-transmission-daemon-with-one-click/

_file=/dev/null
_server="http://127.0.0.1"
_port="9091"
_myname="$(basename "$0")"

if [ -r "$HOME/.config/$_myname.rc" ]; then
  . "$HOME/.config/$_myname.rc"
fi

__usage () {
  cat << EOF
Add a torrent or magnet link to your transmission web interface

$0 [-k file] [-s server] [-p port] [-u user -w password] [-v] [link [link [...]]]
$0 -h

Default values are:
  o file:   $_file
    Used to keep track of which links have already been uploaded to your
    transmission daemon
  o server: $_server
  o port:   $_port
  o user:   <empty>
  o passwd: <empty>

-h: print this help text
-v: be verbose (set -x)

The following syntax also works:
< torrent_list.txt | $0
EOF
}

while getopts ":hk:s:p:u:vw:" _opt; do
  case "$_opt" in
    h) __usage ; exit 0     ;;
    k) _file="$OPTARG"      ;;
    p) _port="$OPTARG"      ;;
    s) _server="$OPTARG"    ;;
    u) _user="$OPTARG"      ;;
    v) set -x               ;;
    w) _password="$OPTARG"  ;;
    *) __usage >&2 ; exit 1 ;;
  esac
done

shift $((OPTIND-1))

# set true if you want every torrent to be paused initially
#_paused="true"
_paused="false"

_endpoint="$_server:$_port/transmission/rpc"
_exit_code=0

if [ -z "$_user" ]; then

  _sessid="$(curl --silent "$_endpoint" | sed 's/.*<code>//g;s/<\/code>.*//g')"

  { if [ -z "$1" ]; then
    cat -
  else
    for _i in "$@"; do
      echo "$_i"
    done
  fi } |
  { while IFS= read -r _link; do
      if ! grep -q "$_link" "$_file"; then
        if curl --silent --header "$_sessid" "$_endpoint" -d \
         "{\"method\":\"torrent-add\",\"arguments\":\
          {\"paused\":$_paused,\"filename\":\"$_link\"}\
         }" | grep -q '"result":"success"'; then
          echo "$_link" >> "$_file"
        else
          : $((_exit_code+=1))
        fi
    fi
  done }

else

  _sessid="$(curl --silent --anyauth --user "$_user:$_password" "$_endpoint" |
      sed 's/.*<code>//g;s/<\/code>.*//g')"

  { if [ -z "$1" ]; then
    cat -
  else
    for _i in "$@"; do
      echo "$_i"
    done
  fi } |
  { while IFS= read -r _link; do
    if ! grep -q "$_link" "$_file"; then
      if curl --silent --anyauth --user "$_user:$_password" --header "$_sessid" \
       "$_endpoint" -d \
       "{\"method\":\"torrent-add\",\"arguments\":\
         {\"paused\":$_paused,\"filename\":\"$_link\"}\
       }" | grep -q '"result":"success"'; then
        echo "$_link" >> "$_file"
      else
        : $((_exit_code+=1))
      fi
    fi
  done }
fi

exit $_exit_code