#!/bin/bash

exec_user() {
    if [ "$USER" != "$1" ]; then
        exec sudo -u "$1" "$0" "$@"
    else
        return 0
    fi
}

exec_user minecraft

cd ~/bin || exit

print_error() {
    >&2 printf '\033[31;1m%s\033[0m \033[1m%s\033[0m\n' ERROR: "$*"
}

public_usage() {
    local name
    name="$(basename "$0")"
    cat << EOF
${name}: utilisation
    ${name} start|status|stop|watch NOM_SERVEUR
    ${name} list|active|usage
EOF
}

error_usage() {
    print_error "Utilisation invalide."
    >&2 public_usage
    return 1
}

public_start() {
    if [ -n "$1" ]; then
        screen -d -m -S "$1" \
            "./${1}"
    else
        error_usage
    fi
}

public_status() {
    if [ -n "$1" ]; then
        printf '\033[1m%s\033[0m : ' "$1"
        if screen -ls "$1" > /dev/null 2>&1; then
            echo "en cours d'exécution"
        else
            echo "non en cours d'exécution"
        fi
    else
        error_usage
    fi
}

public_stop() {
    if [ -n "$1" ]; then
        screen -S "$1" -X stuff '^E^Ustop^M'
    else
        error_usage
    fi
}

public_watch() {
    screen -dr "$1"
}

public_active() {
    screen -ls
}

public_list() {
    echo "Serveurs disponibles :"
    ls --color=auto
}

verb="$1"
shift
case "$verb" in
    start|status|stop|watch|active|list|usage)
        "public_${verb}" "$@"
        ;;
    "")
        public_active
        ;;
    *)
        error_usage
        ;;
esac