#!/bin/bash

VERSION="1.0.0"

cmd="$1"

case "$cmd" in
    stop)
        systemctl stop killswitch.target
        echo "Killswitch activated: all linked services have been stopped."
        ;;
    start)
        systemctl start killswitch.target
        echo "Killswitch deactivated: all linked services have been started."
        ;;
    status)
        systemctl status killswitch.target
        ;;
    help|-h|--help)
        cat << EOF
KillSwitch CLI Tool - v$VERSION

USAGE:
    killsw <command>

COMMANDS:
    stop            Stop all services linked to killswitch.target
    start           Start all services linked to killswitch.target
    status          Show the current status of the killswitch target
    -h, --help      Show this help message
    -v, --version   Show version information

ABOUT KILLSWITCH:
    What it does:
        Stops all services that are linked to 'killswitch.target'. This allows
        you to perform an emergency stop or centralized management of multiple
        services.

    Why it's needed:
        Useful for quickly stopping servers or services in case of maintenance,
        emergency, or to prevent unsafe operations.

    How to enable it on your services:
        1) Create or edit your systemd service to link it to killswitch.target:
            Add the following to your [Unit] section:
                PartOf=killswitch.target
        2) Optionally, enable the service to start at boot:
            sudo systemctl enable <your-service>.service
        3) Start/stop via this script:
            killsw start
            killsw stop
EOF
        ;;
    -v|--version)
        echo "KillSwitch CLI Tool version $VERSION"
        ;;
    *)
        echo "Unknown command: $cmd. Use --help to see available commands."
        ;;
esac