#!/bin/sh
# POSIX

show_help() {
echo "Telegram Sender"
echo ""
echo "usage: [FILENAME] [FILETYPE]"
echo ""
echo "  -t,--token      Provide Telegram bot token"
echo "  -c,--chatid     Provide ID to Send to"
echo "  -f,--file       File to send"
echo "  -a,--audio      Send as Audio File"
echo "  -v,--voice      Send as Voice File"
echo "  -d,--document       Send as Document aka any filetype"
echo "  --text          Text to Send"
echo ""
echo "  Examples:"
echo "  telegram --text \"TEST\" -c 1111111 -t BoTtOkEn"
echo "  telegram -f /somefile -d -c 111111 -t BoTtOkEn"
echo ""
}

URL=https://api.telegram.org/bot

FILE=
SETTYPE2=
TYPE=


verbose=0
 while :; do
   case $1 in
        -h|-\?|--help)
             show_help;  exit ;;
    -f|--file)
    if  [ "$2" ]; then FILE=$2; shift
    else echo "ERROR: "--file" requires a non-empty option argument."; exit 1
    fi ;;

    --text)
    if  [ "$2" ]; then TEXT=$2; shift
    else echo 'ERROR: "--text" requires a non-empty option argument.'; exit 1
    fi
    SETTYPE=""; SETTYPE2="Message"
    ;;

    -d|--document)
    SETTYPE="document"; SETTYPE2="Document"
    ;;
    -v|--voice)
    SETTYPE="voice"; SETTYPE2="Voice"
    ;;
    -a|--audio)
    SETTYPE="audio"; SETTYPE2="Audio"
    ;;
    -c|--chatid)
        if [ "$2" ]; then CHATID=$2; shift
        else echo 'ERROR: "--chatid" requires a non-empty option argument.'
    fi
        ;;
    -t|--token)
        if [ "$2" ]; then TOKEN=$2; shift
        else echo 'ERROR: "--token" requires a non-empty option argument.'
        fi
        ;;
    --)              # End of all options.
        shift
        break ;;
    -?*)
             printf 'WARN: Unknown option (ignored): %s\n' "$1" >&2; exit 1 ;;

    *)               # Default case: No more options, so break out of the loop.
     break
     esac
     shift
done

if [ "$TOKEN" = "" ]; then
    echo 'ERROR: "--token" needed'
    exit 1
fi

if [ "$CHATID" = "" ]; then
    echo "ERROR: "--chatid" needed"
    exit 1
fi

if [ "$SETTYPE2" = "" ]; then
    echo 'ERROR: provide a Mediatype'
    exit
elif [ "$SETTYPE2" = "Message" ]; then
echo "Sending Text Mesaage"
elif [ "$FILE" = "" ]; then
        echo 'ERROR: Provide a Filename with option "-f"'
        exit 1
else
echo "Sending Media"
    TYPE="-F $SETTYPE=@$FILE"
fi


/usr/bin/curl $TYPE "$URL$TOKEN/send$SETTYPE2?chat_id=$CHATID&parse_mode=Markdown&text=$TEXT"