#!/usr/bin/env bash
set -euo pipefail
cd "$( dirname "${BASH_SOURCE[0]}" )"
export NIX_PATH=
host=$1
COPY_USER=yorick
get_target_host() {
    TARGET_HOST=$(nix eval --raw -f vpn.nix ips.$host)
    TARGET_HOST=$(ssh $TARGET_HOST ip --json r get 1.1.1.1 | jq -r '.[0].prefsrc')
}
peek() {
    echo $ "$@" > /dev/stderr
    command "$@"
}
nix() {
    peek nix --extra-experimental-features "nix-command flakes" "$@"
}
nix-build() {
    peek nix-build "$@"
}
case $2 in
    ssh)
        get_target_host
        peek ssh root@"$TARGET_HOST"
        ;;
    build)
        nix build -f servers.nix "$host" --show-trace
        ;; 
    copy)
        get_target_host
        nix copy -f servers.nix "$host" --show-trace --to "ssh://$COPY_USER@$TARGET_HOST"
        ;; 
    test)
        get_target_host
        outPath=$(nix-build servers.nix -A "$host")
        nix copy -f servers.nix "$host" --show-trace --to "ssh://$COPY_USER@$TARGET_HOST"
        peek ssh root@"$TARGET_HOST" $outPath/bin/switch-to-configuration test
        ;; 
    boot)
        get_target_host
        outPath=$(nix-build servers.nix -A "$host")
        nix copy "$outPath" --show-trace --to "ssh://$COPY_USER@$TARGET_HOST"
        peek ssh root@"$TARGET_HOST" nix-env -p "/nix/var/nix/profiles/system" --set "$outPath"
        peek ssh root@"$TARGET_HOST" $outPath/bin/switch-to-configuration boot
        ;;
    switch)
        get_target_host
        outPath=$(nix-build servers.nix -A "$host")
        nix copy "$outPath" --show-trace --to "ssh://$COPY_USER@$TARGET_HOST"
        peek ssh root@"$TARGET_HOST" nix-env -p "/nix/var/nix/profiles/system" --set "$outPath"
        peek ssh root@"$TARGET_HOST" $outPath/bin/switch-to-configuration switch
        ;;
esac