#!/run/current-system/profile/bin/bash

gather_env() {
    # Gather needed information
    echo -n "Type 'e' for encrypted or 'd' for decrypted install: "
    read install_type

    echo -n "Type system hostname: "
    read install_hostname

    echo -n "Type device file for ROOT data: "
    read root_dev

    echo -n "Type device file for BOOT data: "
    read boot_dev

    echo -n "Type device file for SWAP: "
    read swap_dev

}

copy_and_prepare() {
    # Associate devs with uuids
    root_uuid=`blkid $root_dev | awk -F\" '{print $2}'`
    boot_uuid=`blkid $boot_dev | awk -F\" '{print $2}'`
    swap_uuid=`blkid $swap_dev | awk -F\" '{print $2}'`
    # Let's a go!
    echo "Information gathered. Deploying Guix on $root_dev ($root_uuid) with boot on $boot_dev ($boot_uuid) and swap on $swap_dev ($swap_uuid)"
    echo -n "Proceed? (y/n): "
    read install_choice

    if [ "$install_choice" != "y" ]
    then
        echo "Bailing!"
        exit 1
    fi

    # We are installing!
    # Copy template to root of repo
    if [ "$install_type" == "e" ]
    then
        cp ./modules/ryan-config/deploy-templates/HostTemplateEncrypted ./$install_hostname.scm
    elif [ "$install_type" == "d" ]
    then
        cp ./modules/ryan-config/deploy-templates/HostTemplate ./$install_hostname.scm
    else
        echo "Invalid install type (not d or e), bailing!"
        exit 1
    fi

    # Correct the information
    sed -i "s/ChangeMe_ROOT/$root_uuid/" ./$install_hostname.scm
    sed -i "s/ChangeMe_BOOTEFI/$boot_uuid/" ./$install_hostname.scm
    sed -i "s/ChangeMe_SWAP/$swap_uuid/" ./$install_hostname.scm
    sed -i "s/ChangeMe_HOST/$install_hostname/" ./$install_hostname.scm

    # Install!
    echo "Mounting /gnu/store to destination disk..."
    herd start cow-store /mnt

    # Install the non-guix signing keys
    echo "Installing non-guix signing keys for substitutes..."
    curl -o sign-key.pub https://substitutes.nonguix.org/signing-key.pub
    guix archive --authorize < sign-key.pub
}

install_system() {
    echo "Beginning install!"
    guix time-machine -C ./channels.scm -- system -L ./modules --substitute-urls='https://substitutes.nonguix.org https://bordeaux.guix.gnu.org https://ci.guix.gnu.org' init $install_hostname.scm /mnt
}

install_user_env() {
    # System should be installed now, we can chroot in and configure the user profile now
    # NOTE: This assumes the user "ryan" for things, so change the USER var if you change your username

    # Copy some files over to prepare for reboot
    USER=ryan
    guix shell git -- git clone https://git.stationery.faith/ryan77627/guix-dotfiles /mnt/home/$USER/.config/guix

    cp ~/guix-dotfiles/$install_hostname.scm /mnt/home/$USER/.config/guix/$install_hostname.scm
    cp ~/guix-dotfiles/modules/ryan-config/user_first_run.sh /mnt/home/$USER/.bashrc

    chown 1000:1000 -R /mnt/home/ryan

}

gather_env
copy_and_prepare
install_system
install_user_env

# Reboot the machine at this point!
reboot