#!/bin/bash

restoreDir="/etc/restore"

hook_before() {
    mkdir -p "$restoreDir" || exit 1
    pushd "$restoreDir" || exit 2

    rpm -qa | sort > Package.versions.list
    rpm -qa --queryformat '%{NAME}.%{ARCH}\n' | sort > Package.all.list
    zypper se -i -t pattern | awk '/^i\+/ { print $3 }' | sort > Pattern.list
    zypper se -i -t package | awk '/^i\+/ { print $3 }' | sort > Package.list
    zypper lr -e Backup.repos
    zypper ll | awk '/.*\| package.*/ { print $3 }' > Package.lock

    cat > restore.sh <<EOF
#!/bin/bash

if [[ ! -f "Package.list" ]]; then
    echo "This needs to be run inside the restore directory."
    exit 1
fi

if [[ -r "Backup.repos" ]]; then
    echo
    echo "=============================="
    echo "INSTALL REPOS"
    echo "=============================="
    echo
    read -p "Do you want to continue to install backup repositories? [Y/n] " -n 1 -sr promptRepos
    if [[ "\$promptRepos" =~ ^[Yy]$ ]]; then
        echo "Yes"
        zypper ar Backup.repos
        zypper --gpg-auto-import-keys refresh
    else
        echo -e "Cancelled\n"
    fi
fi

if [[ -r "opi.conf" ]]; then
    source "opi.conf"

    if [[ -n "\$opimodules" ]]; then
        echo
        echo "=============================="
        echo "INSTALL OPI"
        echo "=============================="
        echo
        echo "About to install the following OPI modules:"
        echo "\$opimodules"
        echo
        read -p "Do you want to continue to install these? [Y/n] " -n 1 -sr promptOPI
        if [[ "\$promptOPI" =~ ^[Yy]$ ]]; then
            echo "Yes"
            zypper install -y opi
            opi -nm \$opimodules
        else
            echo -e "Cancelled\n"
        fi
    fi
fi

#zypper dist-upgrade --from packman --allow-vendor-change
#zypper install --from packman ffmpeg gstreamer-plugins-{good,bad,ugly,libav} libavcodec vlc-codecs

if [[ -r "Pattern.list" && "\$(wc -l --total=only Pattern.list)" -gt 0 ]]; then
    echo
    echo "=============================="
    echo "INSTALL PATTERNS"
    echo "=============================="
    echo
    echo "The following patterns are listed to be installed:"
    cat Pattern.list
    echo
    read -p "Do you want to continue to install these? [Y/n] " -n 1 -sr promptPattern
    if [[ "\$promptPattern" =~ ^[Yy] ]]; then
        echo "Yes"
        cat Pattern.list | xargs zypper install -t pattern
    else
        echo -e "Cancelled\n"
    fi
fi

echo
echo "=============================="
echo "INSTALL PACKAGES"
echo "=============================="
echo
read -p "About to install the system packages per the backup. Do you want to continue? [Y/n] " -n 1 -sr promptPkgs
if [[ "\$promptPkgs" =~ ^[Yy] ]]; then
    echo "Yes"
    cat Package.list | xargs zypper install
else
    echo -e "Cancelled\n"
fi

# Removal uninstalled packages:
echo
echo "=============================="
echo "REMOVE PACKAGES"
echo "=============================="
echo
read -p "!!WARNING!! The next step is to remove packages that may not be desired. Do you want to continue? [Y/n] " -n 1 -sr promptRm
if [[ "\$promptRm" =~ ^[Yy]$ ]]; then
    # Do the thing
    echo "Yes"
    rpm -qa --queryformat '%{NAME}.%{ARCH}\n' | sort > /tmp/Package.new.list
    echo "Here's a list of packages that would be removed:"
    comm -13 Package.all.list /tmp/Package.new.list

    read -p "Do you want to omit any removals or cancel? [N, y, c] " -n 1 -sr promptRmVerify
    if [[ "\$promptRmVerify" =~ ^[Yy]$ ]]; then
        echo
        read -p "What do you want to omit, seperated by spaces? " -r promptOmit
        omitrm="\$(echo "\$promptOmit" | tr ' ' '|')"
        echo
    elif [[ "\$promptRmVerify" =~ ^[Cc]$ ]]; then
        echo -e "\nCancelling"
        omitrm="CANCEL"
    else
        omitrm=""
        echo
    fi
    
    if [[ "\$omitrm" != "CANCEL" ]]; then
        comm -13 Package.all.list /tmp/Package.new.list | egrep -v "(\$omitrm)" | xargs zypper remove
    fi
else
    echo -e "Cancelled\n"
fi

# Package Locks
if [[ -r "Package.lock" && "\$(wc -l --total=only Package.list)" -gt 0 ]]; then
    echo
    echo "=============================="
    echo "PACKAGE LOCKS"
    echo "=============================="
    echo
    echo "The following packages are found to be locked:"
    cat Package.lock
    echo
    read -p "Do you want to lock these packages per the backup? [Y/n] " -n 1 -sr promptLock
    if [[ "\$promptLock" =~ ^[Yy]$ ]]; then
        echo "Yes"
        cat Package.lock | xargs zypper addlock
    else
        echo -e "Cancelled\n"
    fi
fi
EOF

    popd || exit 2
}

hook_after() {
    :
}

hook_fail() {
    :
}

hook_final() {
    :
}

case "$1" in
    before)     hook_before     || exit $?;;
    after)      hook_after      || exit $?;;
    fail)       hook_fail       || exit $?;;
    finally)    hook_final      || exit $?;;
esac