#!/usr/bin/env nix-shell
#!nix-shell --pure -i bash -p bash jq envsubst wget
# shellcheck shell=bash
set -Eeuo pipefail

end="\033[0m"

green() {
  green_color="\033[0;32m"
  echo -e "${green_color}${1}${end}"
}

yellow() {
  yellow_color="\033[0;33m"
  echo -e "${yellow_color}${1}${end}"
}

blue() {
  blue_color="\033[0;34m"
  echo -e "${blue_color}${1}${end}"
}

red() {
  red_color="\033[0;31m"
  echo -e "${red_color}${1}${end}"
}

usage() {
  red "Missing input argument $1.\n"
  cat <<EOF
Usage:
    install-nixos.sh <HOST_NAME> <DEVICE>

      Arguments
        HOST_NAME         The networking.hostName of the installation. Something like 'velhinho-nixos'.
        DEVICE            The LUKS device where to install to. Use lsblk or similar tools to get it's name.

Examples:
    Download install-nixos.sh and run it with 'velhinho-nixos' as hostName and '/dev/sda3' as LUKS device:
        wget -O- https://euandre.org/dotfiles/install-nixos.sh | sh -s velhinho-nixos /dev/sda3
EOF
}

HOST_NAME="${1:-}"
DEVICE="${2:-}"

[[ -z "${HOST_NAME}" ]] && {
  usage 'HOST_NAME'
  exit 2
}

[[ -z "${DEVICE}" ]] && {
  usage 'DEVICE'
  exit 2
}

SERVER="https://euandre.org/dotfiles"

yellow "Downloading Nix files..."
TMP_DIR="$(mktemp -d)"
wget -O "${TMP_DIR}/configuration.nix"          "${SERVER}/configuration.nix"
wget -O "${TMP_DIR}/hardware-configuration.nix" "${SERVER}/hardware-configuration.nix"
wget -O "${TMP_DIR}/template.nix"               "${SERVER}/template.nix"
green "Done."

export HOST_NAME
export DEVICE
envsubst < "${TMP_DIR}/template.nix" > /etc/nixos/local-configuration.nix

# fdisk