#!/bin/bash

# Funktion zur Installation erforderlicher Pakete
install_packages() {
    local DISTRO=$1
    case $DISTRO in
        "debian"|"ubuntu")
            apt-get update
            apt-get install -y realmd samba-common samba-common-bin krb5-user sssd adcli packagekit
            ;;
        "rhel"|"centos"|"fedora")
            yum install -y realmd samba samba-common samba-common-tools krb5-workstation sssd adcli
            ;;
        "arch")
            pacman -Syu --noconfirm realmd samba krb5 sssd adcli
            ;;
        *)
            echo "Unsupported distribution: $DISTRO"
            exit 1
            ;;
    esac
}

# Funktion zum Joinen der Domäne
join_domain() {
    local DOMAIN=$1
    local USER=$2
    local PASSWORD=$3

    echo "Konfiguriere Domain-Join für Domain: $DOMAIN"

    # Realm beitreten
    echo "$PASSWORD" | realm join --user="$USER" "$DOMAIN" --password

    # Überprüfen, ob der Join erfolgreich war
    if [ $? -eq 0 ]; then
        echo "Domain join erfolgreich!"
    else
        echo "Fehler beim Domain Join."
        exit 1
    fi

    # Automatische Anmeldung aktivieren
    if [ -f /etc/pam.d/common-session ]; then
        sed -i 's/^.*pam_sssd.so/#&/' /etc/pam.d/common-session
        sed -i 's/^.*pam_sssd.so/#&/' /etc/pam.d/common-session-noninteractive
        sed -i '/common-session/a session    required   pam_mkhomedir.so skel=/etc/skel umask=0022' /etc/pam.d/common-session
    fi
}

# Funktion zur Erkennung der Distribution
get_distro() {
    if [ -f /etc/os-release ]; then
        . /etc/os-release
        echo "$ID"
    else
        echo "Unknown"
    fi
}

# Hauptskript
main() {
    if [ "$#" -ne 3 ]; then
        echo "Usage: $0 <domain> <username> <password>"
        exit 1
    fi

    local DOMAIN=$1
    local USER=$2
    local PASSWORD=$3

    local DISTRO=$(get_distro)

    install_packages "$DISTRO"
    join_domain "$DOMAIN" "$USER" "$PASSWORD"
}

main "$@"