#!/usr/bin/env bash
# detect.sh — distro + arch detection. Exports DISTRO and ARCH.

detect_distro() {
  DISTRO="unknown"
  ARCH="$(uname -m)"
  case "$ARCH" in
    x86_64)        ARCH="amd64" ;;
    aarch64|arm64) ARCH="arm64" ;;
  esac

  if [[ -f /etc/os-release ]]; then
    # shellcheck disable=SC1091
    . /etc/os-release
    case "${ID:-}" in
      debian|ubuntu) DISTRO="debian" ;;
      arch)          DISTRO="arch" ;;
      *)
        case "${ID_LIKE:-}" in
          *debian*) DISTRO="debian" ;;
          *arch*)   DISTRO="arch" ;;
        esac ;;
    esac
  fi

  export DISTRO ARCH
}

detect_distro