#!/bin/sh

set -eo pipefail

HOST=$(hostname)
DIR=$(realpath "$(dirname "$0")")
OUT=$(mktemp -du)
ROOT="$DIR/roots/$HOST.nix"

echo Active tree: "$ROOT"

## Build the libkookie tree
function build {  
    NIXPKGS_ALLOW_UNFREE=1 \
            nix build -f '<nixpkgs/nixos>' system \
            -I nixos-config="$ROOT" \
            -I "nixpkgs=$DIR/nixpkgs" \
            -I "nixpkgs-overlays=$DIR/overlays" \
            -I "home-manager=$DIR/home-manager" \
            --out-link "$OUT" "$@"
}

## Build and output build path for debugging
function debug {
    build
    echo "Build path: $OUT"
    exit 0
}

## Build and switch to the new configuration (requires root)
function switch {
    build
    nix-env -p /nix/var/nix/profiles/system --set "$OUT"
    "$OUT"/bin/switch-to-configuration switch
}

case "$1" in
    -s* | --switch*) shift; switch ;;
    -d* | --debug*)  shift; debug ;;
    *)               build ;;
esac

rm -rf "$OUT"*