#!/usr/bin/env bash

set -Eeuo pipefail

RKMEDIA_SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
RKMEDIA_ROOT="$(cd -- "${RKMEDIA_SCRIPT_DIR}/.." && pwd -P)"

log() {
  printf '[rkmedia] %s\n' "$*" >&2
}

die() {
  printf '[rkmedia] ERROR: %s\n' "$*" >&2
  exit 1
}

need_command() {
  command -v "$1" >/dev/null 2>&1 || die "required command not found: $1"
}

absolute_path() {
  realpath -m -- "$1"
}

assert_child_path() {
  local parent child
  parent="$(absolute_path "$1")"
  child="$(absolute_path "$2")"
  case "${child}" in
    "${parent}"/*) ;;
    *) die "refusing operation outside ${parent}: ${child}" ;;
  esac
  [[ "${child}" != "${parent}" ]] || die "refusing operation on parent directory itself: ${parent}"
}

reset_child_dir() {
  local parent="$1"
  local child="$2"
  assert_child_path "${parent}" "${child}"
  rm -rf -- "${child}"
  mkdir -p -- "${child}"
}

require_arm64_trixie() {
  local arch codename
  arch="$(dpkg --print-architecture 2>/dev/null || true)"
  codename=""
  if [[ -r /etc/os-release ]]; then
    # shellcheck disable=SC1091
    . /etc/os-release
    codename="${VERSION_CODENAME:-}"
  fi

  if [[ "${arch}" != "arm64" || "$(uname -m)" != "aarch64" || "${codename}" != "trixie" ]]; then
    if [[ "${RKMEDIA_ALLOW_UNSUPPORTED_HOST:-0}" == "1" ]]; then
      log "warning: unsupported build host (dpkg=${arch}, uname=$(uname -m), suite=${codename:-unknown})"
      return
    fi
    die "native Debian Trixie arm64 is required (set RKMEDIA_ALLOW_UNSUPPORTED_HOST=1 only for development)"
  fi
}