#/bin/bash

#
# little class about bash extension parametters.
#
# ${myvar#pattern} delete shortest occurence from the begining
# ${myvar##pattern} delete longuest occurence from begining
# ${myvar%pattern} delete shortest occurence from the end
# ${myvar%%pattern} delete longuest occurence from the end
#
# conclusion, use of # will delete the pattern at begining
# and % will delete the parameter at the end.


default_user="root"
default_hostname="localhost"
default_ssh_port="22"
default_rsp_port="3389"
default_vnc_port="5900"

Version="2.0.1"

Usage="
$(basename $0) [OPTION] [OPTION=VALUE] PROTOCOL

script which permit to launch a remote connection protocol.

PROTOCOL available
    ssh                                     A command line protocol which can be used to connect with tcp
    rsp                                     The windows remote server protocol

PROTOCOL #TODO
    vnc                                     Virtual Networking Computing, permit to have access to a graphical user interface.

OPTION available
    -v, --version                           print the version and exit
    -h, --help                              print this help and exit
    -u <user>,--user=<user>                 Select the user, by default root
    -p <port>,--port=<port>                 Select the port, by default 10022
    -H <hostname>, --hostname=<hostname>    Select the hostname to connect
"


start_ssh() {
    if [ "${port}" == "" ]
    then
        port="${default_ssh_port}"
    fi
    echo "start ssh with user=${user} port=${port} hostname=${hostname}"
    ssh -o "StrictHostKeyChecking no" -o "UserKnownHostsFile=/dev/null" -p "${port}" "${user}@${hostname}"
}

start_rsp() {
    if [ "${port}" == "" ]
    then
        port="${default_rsp_port}"
    fi
    hostname="${hostname}:${port}"
    echo "start rsp with user=${user} port=${port} hostname=${hostname}"
    xfreerdp /v:"${hostname}" /u:"${user}" /dynamic-resolution
}


# Parser
# looking for double parametters.

for (( arg=1; arg<$#; arg++)); do
    value="$((arg+1))"
    if [ "${!arg}" == "-u" ]
    then
        user="${!value}"
    elif [ "${!arg}" == "-p" ]
    then
        port="${!value}"
    elif [ "${!arg}" == "-H" ]
    then
        hostname="${!value}"
    fi
done


# looking for all parametter alone

for i in "$@"; do
    case "$i" in
        "ssh")
            protocol="ssh"
            ;;
        "rsp")
            protocol="rsp"
            ;;
        "--version" | "-v")
            echo "$(basename $0) v.${Version}"
            exit 0
            ;;
        "--help" | "-h")
            echo "${Usage}"
            exit 0
            ;;
    esac
done

for i in "$@"; do
    case "${i%=*}" in
        "--user")
            user="${i#*=}"
            ;;
        "--port")
            port="${i#*=}"
            ;;
        "--hostname")
            hostname="${i#*=}"
            ;;
    esac
done

if [ "${user}" == "" ]
then
    user="${default_user}"
fi
if [ "${hostname}" == "" ]
then
    hostname="${default_hostname}"
fi



# Last check, if protocol define, launch it, else, exit 0
case "${protocol}" in
    "ssh")
        start_ssh
        ;;
    "rsp")
        start_rsp
        ;;
    *)
        echo "protocol ${protocol} uknown" >&2
        echo "${Usage}"
        exit
        ;;
esac