#!/usr/bin/env bash

set -euo pipefail

echo "==> Checking for Nix..."
if ! command -v nix >/dev/null 2>&1; then
    echo "==> Installing Nix vis Determinate Systems installer..."
    curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
    . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
else
    echo "Nix already installed, skipping."
fi

echo "==> Copying config to /etc/nix-darwin..."
sudo mkdir -p /etc/nix-darwin
sudo cp -r . /etc/nix-darwin
sudo chown -R root:wheel /etc/nix-darwin

echo "==> Renaming conflicting shell files if present..."
[ -f /etc/bashrc ] && sudo mv /etc/bashrc /etc/bashrc.before-nix-darwin
[ -f /etc/zshrc ] && sudo mv /etc/zshrc /etc/zshrc.before-nix-darwin
[ -f /etc/zshenv ] && sudo mv /etc/zshenv /etc/zshenv.before-nix-darwin

echo "==> Bootstraping nix-darwin..."
nix run nix-darwin/master#darwin-rebuild -- switch --flake /etc/nix-darwin

echo "==> Done! Restart your terminal to apply all changes."