#!/bin/bash
########################
#Configure this section
########################
TARGET='/install'
mkdir $TARGET
######################################
echo
HARD_DISK=$2
EFI="/dev/$(lsblk | grep $HARD_DISK | head -2 | tail -1 | cut -c 7-20 | cut -d ' ' -f1)"
BTRFS="/dev/$(lsblk | grep $HARD_DISK | head -4 | tail -1 | cut -c 7-20 | cut -d ' ' -f1)"
BOOT="/dev/$(lsblk | grep $HARD_DISK | head -3 | tail -1 | cut -c 7-20 | cut -d ' ' -f1)"
ROOT_NAME='debian'
USB_BACKUP='/dev/disk/by-uuid/be22aef7-2d82-4078-86d5-07ef298fa367'
######################################
USER="verita84"
USER_PASSWORD="123456"
ROOT_PASSWORD="123456"
WIRELESS_PASSWORD='123456'
SSID='123456'
WIRELESS_INTERFACE='wlan0'
DISK_PASSWORD='123456'

FLATPAKS+=( app/org.gnome.Photos app/org.mozilla.firefox org.gnome.Evolution app/com.vscodium.codium app/org.libreoffice.LibreOffice org.gajim.Gajim org.gajim.Gajim.Plugin.omemo org.telegram.desktop app/im.riot.Riot app/io.mpv.Mpv app/org.gimp.GIMP fr.handbrake.ghb org.kde.kdenlive )

#Packages
SHARED_DESKTOP_APPS=" gnome-core yt-dlp "
PACKAGES=" linux-cpupower locales syncthing samba redis aardvark-dns cockpit cockpit-machines cockpit-podman flatpak powertop blueman cups acpi packagekit cockpit-packagekit cockpit-pcp cockpit-storaged acpid podman podman-compose pulseaudio aardvark-dns ghostscript cifs-utils ntp vim-airline rsync screen base udev git network-manager efibootmgr linux-headers-amd64 cryptsetup network-manager-openvpn ntp screen docbook-xsl alsa-utils sysstat postgresql redis neofetch podman-toolbox fuse3 build-essential unzip bash-completion parted dosfstools wget curl "
VIRTUALIZATION=" virt-manager qemu-system libvirt-daemon-system ovmf "
PACKAGES=$PACKAGES$SHARED_DESKTOP_APPS$VIRTUALIZATION
SERVICES+=( powertop cpupower );

auto_login(){
    sed -i "/#WaylandEnable=false/a AutomaticLoginEnable=True" $TARGET/etc/gdm3/daemon.conf
    sed -i "/True/a AutomaticLogin=$USER" $TARGET/etc/gdm3/daemon.conf
}

clean-old-usb-snapshots(){
    echo;echo "[Cleaning up old USB snapshots.....]";echo
    btrfs sub delete $TARGET/$ROOT_NAME-$1
    btrfs sub delete $TARGET/flatpak
    echo;echo "[Cleaning up old EFI data.....]";echo
    rm -rf $TARGET/efi-$1
}

clean-old-snapshots() {
    echo;echo "[Cleaning up old snapshots.....]";echo
    btrfs sub delete /.snapshots/$ROOT_NAME-$1
    btrfs sub delete /.snapshots/flatpak
}

create-usb-snapshots(){
    echo;echo "[Creating new ROOT and Flatpak snapshots.....]";echo
    btrfs sub snap -r / /.snapshots/$ROOT_NAME-$1
    btrfs sub snap -r /var/lib/flatpak /.snapshots/flatpak
}

send-snapshots(){
    echo;echo "[Sending snapshot to $USB_BACKUP]";echo
    btrfs send  /.snapshots/$ROOT_NAME-$1 | btrfs receive $TARGET
    echo;echo "[Sending Flatpaks to $USB_BACKUP]";echo
    btrfs send  /.snapshots/flatpak | btrfs receive $TARGET
}

copy-efi-to-usb(){
    echo;echo "[Copying EFI data....]";echo
    mkdir $TARGET/efi-$1
    mkdir $TARGET/$1
    cp -rf /boot/* $TARGET/efi-$1/
}

homeBackup() {
    echo;echo "[Copying USER data....]";echo
    rsync -av --delete /home/ $TARGET/home/
}

usb-backup() {
    umount $TARGET

    echo;echo "[Mounting $USB_BACKUP]";echo
    mount $USB_BACKUP $TARGET

    homeBackup
    clean-old-snapshots "$1"
    clean-old-usb-snapshots "$1"
    create-usb-snapshots "$1"
    send-snapshots "$1"
    clean-old-snapshots "$1"
    copy-efi-to-usb "$1"
    cp -f /usr/bin/debian.sh $TARGET/$1
    ls $TARGET/
    umount $TARGET
}

usb-restore() {
    partitions
    rsync -av ../$ROOT_NAME-$1/ $TARGET/ --exclude=/home --delete
    rsync -av ../flatpak/ $TARGET/var/lib/flatpak/ --delete
    cp -rf ../efi-$1/* $TARGET/boot/
    fstab
    cp -f debian.sh $TARGET/
    systemMounts
    chroot $TARGET /debian.sh bootloader
    chroot $TARGET /debian.sh btrfs-tweaks
    rm -f $TARGET/debian.sh
    unmount
}


systemMounts(){
    mount -o bind /dev $TARGET/dev
    mount -o bind /dev/pts $TARGET/dev/pts
    mount -o bind /proc $TARGET/proc
    mount -o bind /sys $TARGET/sys
}

install() {
    partitions
    sed -i '/^SigLevel/s/^\(.*\)$/#\1\n/' /etc/pacman.conf
	sed -i '/#SigLevel/a SigLevel = Never' /etc/pacman.conf
    pacman -Sy archlinux-keyring debootstrap --noconfirm
    apt update;apt install debootstrap -y 
    rm -rf /debootstrap 
    debootstrap --arch amd64 sid $TARGET https://deb.debian.org/debian
    systemMounts
    cp -f /etc/resolv.conf $TARGET/etc/
    echo "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" > $TARGET/setup.sh 
    echo "deb https://deb.debian.org/debian sid main contrib non-free" >>$TARGET/etc/apt/sources.list
    chroot $TARGET /usr/bin/apt update
    chroot $TARGET /usr/bin/apt install -y $PACKAGES
    locale
    accounts
    auto_login
    zram
    custom_service_files
    services
    btrfs-tweaks
    cpuPower
    hosts
    setup_script
    unmount
}


desktop(){
    systemctl disable --now exim4
    systemctl disable --now cockpit.socket
    systemctl disable --now redis-server
    systemctl disable --now postgresql
    apt remove firefox-esr -y
}

snapshots() {
    echo
    echo "Creating Snapshots....."
    echo
    DATE=$(echo $(date +%Y-%m-%d-%H-%M-%S))
    btrfs sub snapshot / /.snapshots/root-${DATE}
    update-grub
}

remove-snapshots() {
    btrfs sub delete /.snapshots/*
    rm -f /boot/loader/entries/root-*
}

enter_chroot() {
    printf "$DISK_PASSWORD" | cryptsetup open ${BTRFS} root     
    mounts
    systemMounts 
    chroot $TARGET /bin/bash
}

flatpaks() {
	flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
    for i in "${FLATPAKS[@]}"; do
    echo $i
        flatpak install $i -y
    done
}


grub-snapshots(){
    cd /opt
    git clone https://github.com/Antynea/grub-btrfs.git
    cd /opt/grub-btrfs
    make
}

kernel-packages(){
    /usr/bin/apt install --reinstall -y  grub-efi efibootmgr plymouth plymouth-themes btrfs-progs cryptsetup-initramfs linux-image-amd64 linux-headers-amd64 firmware-iwlwifi firmware-linux firmware-linux-nonfree  
}

bootloader() {
    echo "root UUID=$(/sbin/blkid | grep $BTRFS | cut -d '"' -f2)  none luks" > /etc/crypttab 
    /sbin/update-initramfs -c -k all
    echo "GRUB_CMDLINE_LINUX_DEFAULT=\"quiet splash\"" >/etc/default/grub 
    echo "GRUB_CMDLINE_LINUX=cryptdevice=UUID=$(/sbin/blkid | grep $BTRFS | cut -d '"' -f2):root root=UUID=$(/sbin/blkid | grep root | cut -d '"' -f4) rootflags=subvol@${ROOT_NAME} mitigations=-off" >>/etc/default/grub   
    echo "GRUB_ENABLE_CRYPTODISK=y" >>/etc/default/grub   
    /sbin/grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=${ROOT_NAME}
    /sbin/update-grub
}

 function setup_script() {
    cp -f debian.sh $TARGET/usr/bin/
    echo 'bash /usr/bin/debian.sh kernel-packages' >>$TARGET/setup.sh
    echo 'bash /usr/bin/debian.sh bootloader' >>$TARGET/setup.sh
    echo 'bash /usr/bin/debian.sh grub-snapshots' >>$TARGET/setup.sh
    echo 'bash /usr/bin/debian.sh desktop' >>$TARGET/setup.sh
    #echo 'bash /usr/bin/debian.sh flatpaks' >>$TARGET/setup.sh
    echo 'bash /usr/bin/debian.sh btrfs-tweaks' >>$TARGET/setup.sh
   
    chmod +x $TARGET/usr/bin/debian.sh
    chmod +x $TARGET/setup.sh
    chroot $TARGET /setup.sh
    rm -f $TARGET/setup.sh
}

function cpuPower() {
    #CPU POWERSAVE AND ACPI Events
    echo "governor='powersave'" >>$TARGET/etc/default/cpupower
    echo "min_freq='400MHz'" >>$TARGET/etc/default/cpupower
    echo "max_freq='2GHz'" >>$TARGET/etc/default/cpupower
}

btrfs_filesytem() {
    btrfs sub create $TARGET/@$ROOT_NAME
    btrfs sub create $TARGET/@.snapshots
    btrfs sub create $TARGET/@flatpak
    btrfs sub create $TARGET/@libvirt
    btrfs sub create $TARGET/@home
    btrfs sub create $TARGET/@root
    btrfs sub create $TARGET/@postgres
    btrfs sub create $TARGET/@containers
    echo
    echo "Binding BTRFS Root"
    echo
    umount $TARGET
    mount -o subvol=@$ROOT_NAME /dev/mapper/root $TARGET
}

mounts() {
    echo
    echo "Mounting......."
    mount /dev/mapper/root $TARGET
    btrfs_filesytem
    mkdir -p $TARGET/boot
    mount -t ext4 $BOOT $TARGET/boot
    mkdir -p $TARGET/boot/efi
    mount $EFI $TARGET/boot/efi
    #CONFIGURE DATA DIRS (HOME AND FLATPAK)
    mkdir $TARGET/home
    mount -o subvol=@home /dev/mapper/root $TARGET/home
    mkdir -p $TARGET/var/lib/flatpak
    mount -o subvol=@flatpak /dev/mapper/root $TARGET/var/lib/flatpak
}

unmount() {
    echo
    echo "Unmounting....."
    umount $TARGET/proc
    umount $TARGET/dev
    umount $TARGET/sys
    umount $TARGET/boot
    umount $TARGET/home
    umount -R $TARGET/*
    umount -R $TARGET/var/lib/flatpak
    umount -R $TARGET
    umount -R $TARGET
}

locale() {
    echo "ln -sf /usr/share/zoneinfo/US/Mountain /etc/localtime" >>$TARGET/setup.sh
    echo "hwclock --systohc" >>$TARGET/setup.sh
    echo "en_US.UTF-8 UTF-8" >$TARGET/etc/locale.gen
    echo "locale-gen" >>$TARGET/setup.sh
}

partitions() {
    echo
    echo "Setting Up Partitions....."
    printf "$DISK_PASSWORD" | cryptsetup open ${BTRFS} root

    unmount

    echo
    echo "Formatting $EFI"
    echo
    echo y | mkfs.vfat $EFI
    echo "Formatting $BOOT"
    echo y | mkfs.ext4 $BOOT

    mounts

    #Configure /etc/fstab
    fstab
}

fstab() {
    mkdir $TARGET/etc
    echo "UUID=$(/sbin/blkid | grep ${BOOT} | cut -d '"' -f2)  /boot ext4 defaults 0 1" >$TARGET/etc/fstab
    echo "UUID=$(/sbin/blkid | grep ${EFI} | cut -d '"' -f4)  /boot/efi vfat umask=0077 0 1" >>$TARGET/etc/fstab
    echo "/dev/mapper/root / btrfs noatime,nodiratime,autodefrag,compress,subvol=@$ROOT_NAME 0 1" >>$TARGET/etc/fstab
    echo "/dev/mapper/root /.snapshots btrfs noatime,nodiratime,autodefrag,compress,subvol=@.snapshots 0 1" >>$TARGET/etc/fstab
    echo "/dev/mapper/root /var/lib/flatpak btrfs noatime,nodiratime,autodefrag,compress,subvol=@flatpak 0 1" >>$TARGET/etc/fstab
    echo "/dev/mapper/root /var/lib/libvirt btrfs noatime,nodiratime,autodefrag,compress,subvol=@libvirt 0 1" >>$TARGET/etc/fstab
    echo "tmpfs /var/log tmpfs defaults 0 0" >>$TARGET/etc/fstab
    echo "tmpfs /var/cache/pacman/pkg tmpfs defaults 0 0" >>$TARGET/etc/fstab
    echo "/dev/mapper/root /home btrfs noatime,nodiratime,autodefrag,compress,subvol=@home 0 1" >>$TARGET/etc/fstab
    echo "/dev/mapper/root /root btrfs noatime,nodiratime,autodefrag,compress,subvol=@root 0 1" >>$TARGET/etc/fstab
    echo "/dev/mapper/root /var/lib/postgres btrfs noatime,nodiratime,autodefrag,compress,subvol=@postgres 0 1" >>$TARGET/etc/fstab
    echo "/dev/mapper/root /var/lib/containers btrfs noatime,nodiratime,autodefrag,compress,subvol=@containers 0 1" >>$TARGET/etc/fstab
}

accounts() {
    echo
    echo "Set Password for $USER"
    echo "useradd -m -s /bin/bash $USER" >>$TARGET/setup.sh
    echo "echo \"$USER:$USER_PASSWORD\"| chpasswd " >>$TARGET/setup.sh
    echo "gpasswd -a $USER wheel" >>$TARGET/setup.sh
    echo "gpasswd -a $USER network" >>$TARGET/setup.sh
    echo "gpasswd -a $USER video" >>$TARGET/setup.sh
    echo "gpasswd -a $USER libvirt" >>$TARGET/setup.sh
    echo "$USER ALL=(ALL) ALL" >$TARGET/etc/sudoers
    echo "root ALL=(ALL) ALL" >>$TARGET/etc/sudoers
    echo
    echo "Setting ROOT Password:"
    echo "echo \"root:$ROOT_PASSWORD\"| chpasswd " >>$TARGET/setup.sh

    #Change Shell to ZSH
    #echo "printf "$USER_PASSWORD" | chsh -s /bin/zsh $USER" >>$TARGET/setup.sh
    #echo "printf "$ROOT_PASSWORD" | chsh -s /bin/zsh " >>$TARGET/setup.sh
}

btrfs-tweaks() {
DISABLE_COW=("/var/lib/docker"  "/var/lib/containers"  "/var/lib/postgres"  "/var/lib/mysql"  "/var/lib/libvirt");  

     for i in "${DISABLE_COW[@]}"
        do
                chattr -R +C $i 
        done
}


custom_service_files() {
    echo "systemctl set-default graphical.target" >>$TARGET/setup.sh
 
    echo "[Unit]" >$TARGET/etc/systemd/system/powertop.service
    echo "Description=Powertop tunings" >>$TARGET/etc/systemd/system/powertop.service
    echo "[Service]" >>$TARGET/etc/systemd/system/powertop.service
    echo "Type=oneshot" >>$TARGET/etc/systemd/system/powertop.service
    echo "ExecStart=/usr/sbin/powertop --auto-tune" >>$TARGET/etc/systemd/system/powertop.service
    echo "[Install]" >>$TARGET/etc/systemd/system/powertop.service
    echo "WantedBy=multi-user.target" >>$TARGET/etc/systemd/system/powertop.service

}

services() {
    for i in "${SERVICES[@]}"
        do
                echo "systemctl enable $i" >>$TARGET/setup.sh
        done

}

initialize-disk() {
    parted /dev/$HARD_DISK mklabel gpt
    parted /dev/$HARD_DISK mkpart primary fat32 1MiB 200MiB
    parted /dev/$HARD_DISK mkpart primary ext3 200MiB 500MiB
    parted /dev/$HARD_DISK set 1 esp on
    parted /dev/$HARD_DISK mkpart P2 ext3 500MiB 100%
    printf "$DISK_PASSWORD\n$DISK_PASSWORD" | cryptsetup luksFormat ${BTRFS}
    printf "$DISK_PASSWORD" | cryptsetup open ${BTRFS} root 
    echo
    echo "Formatting....."
    echo y | mkfs.btrfs /dev/mapper/root --force
}

wifi() {
    iwctl --passphrase $WIRELESS_PASSWORD station $WIRELESS_INTERFACE connect $SSID
}

zram() {
  echo -e "ALGO=zstd\nPERCENT=60" | sudo tee -a $TARGET/etc/default/zramswap
}

show-help() {
    echo
    echo "debian.sh arguments:"
    echo
    echo "./debian.sh install [disk]"
    echo "./debian.sh backup [device name]"
    echo "./debian.sh restore [device name"
    echo "./debian.sh chroot"
    echo "./debian.sh wifi"
    echo "./debian.sh bootloader"
    echo "./debian.sh initialize [disk]"
    echo "./debian.sh snapshot"
    echo "./debian.sh reomve-snapshot"
    echo "./debian.sh btrfs-tweaks"
    echo
}

if [ "$1" = "install" ]; then
    install
elif [ "$1" = "desktop" ]; then
    desktop
elif [ "$1" = "kernel-packages" ]; then
    kernel-packages
elif [ "$1" = "upgrade-system" ]; then
    upgrade-system
elif [ "$1" = "chroot" ]; then
    enter_chroot
elif [ "$1" = "initialize" ]; then
    initialize-disk
elif [ "$1" = "wifi" ]; then
    wifi
elif [ "$1" = "flatpaks" ]; then
    flatpaks
elif [ "$1" = "bootloader" ]; then
    bootloader
elif [ "$1" = "snapshot" ]; then
    snapshots
elif [ "$1" = "backup" ]; then
    usb-backup "$2"
elif [ "$1" = "grub-snapshots" ]; then
    grub-snapshots
elif [ "$1" = "btrfs-tweaks" ]; then
    btrfs-tweaks
elif [ "$1" = "restore" ]; then
    usb-restore "$2"
elif [ "$1" = "remove-snapshot" ]; then
    remove-snapshots
elif [ "$1" = "help" ]; then
    show-help
else
    show-help
fi