#!/usr/bin/env bash
# e - script stops on error (return != 0)
# u - error if undefined variable
# o pipefail - script fails if one of piped commands fails
# x - output each line (debug)
set -euo pipefail

if [ "$1" = "all" ]; then
  BUILT=()
  for file in kitteh-node-*/*; do
    FILE_NO_EXTENSION="${file/".nix"/""}"
    
    # checksum modification checking
    if [ ! -d "meta/$(dirname "$file")" ]; then
      mkdir -p "meta/$(dirname "$file")"
    fi
    sha512sum "$file" > /tmp/kt-clusterbuild_sha512sum

    if [ ! -f "meta/$file.sha" ] || ! diff -q "/tmp/kt-clusterbuild_sha512sum" "meta/$file.sha" > /dev/null; then
      ./"${0}" "$FILE_NO_EXTENSION"

      # shellcheck disable=SC2181
      if [ $? -ne 0 ]; then
        echo "Failed to build, skipping..."
        continue
      fi

      if ! grep -q "out/$FILE_NO_EXTENSION.vma.zst" meta/tagged_for_upload; then
        echo "out/$FILE_NO_EXTENSION.vma.zst" >> meta/tagged_for_upload
      fi
    else
      echo "Not building '$FILE_NO_EXTENSION'."
      continue
    fi

    BUILT+=("$FILE_NO_EXTENSION")

    mv "/tmp/kt-clusterbuild_sha512sum" "meta/$file.sha"
  done

  echo "Done building:"
  declare -p BUILT
fi

if [ "$1" != "all" ]; then
  echo "Building '$1'..."
  nix --extra-experimental-features nix-command run github:nix-community/nixos-generators -- --format proxmox --configuration "$1.nix" | tee build.log

  if [ ! -d "out/" ]; then
    mkdir out/
  fi

  echo "Copying file to the output directory..."

  mkdir -p "out/$(dirname "$1")"
  rm -rf out/"$1".vma.zst
  OUT_FILE="$(sed -n '$p' build.log)"
  cp -r "$OUT_FILE" out/"$1".vma.zst
fi