#!/usr/bin/env sh
# NOTE: Untested on case of no home-manager
set -xv
# Where this script located
SCRIPT_DIR=$(realpath $(dirname $0))
echo "SCRIPT_DIR: ${SCRIPT_DIR}"

HOME_MANAGER_DIR="${SCRIPT_DIR}/../nix-conf/home-manager"

# Manage nix.conf. Ideally, this should be done with snapshot-based version
# and with preview on-the-spot, with some timeout
if [ -f /etc/nix/nix.conf ]; then
    # managed nix.conf
    BACKUP_FILE="/etc/nix/nix.conf.backup"
    echo "overwriting /etc/nix/nix.conf. Please find latest backup in ${BACKUP_FILE}"
    sudo cp /etc/nix/nix.conf ${BACKUP_FILE}
    sudo cp "${HOME_MANAGER_DIR}/hwtr/nix.conf" /etc/nix/
fi

# Mason is bad: it puts binaries onto xdg.data
# let's make mason starts fresh, just in case we introduce RPATH hacks 
# that injects binary for Mason to use.
rm -rf ~/.local/share/nvim/mason

# test if we have home-manager, if not, attempt to use nix to put home-manager to
# our environment
if [ $(home-manager help >/dev/null 2>&1) ]; then
    nix-shell -p home-manager --run "home-manager switch --flake $HOME_MANAGER_DIR $@"
else
    home-manager switch -b backup --flake "$HOME_MANAGER_DIR" $@
fi