#!/usr/bin/env bash
set -euo pipefail

command_name="${1:-build}"
requested_arch="${2:-${ALPINE_ARCH:-x86_64}}"
repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
alpine_version="${ALPINE_VERSION:-3.22}"
repo_name="${ALPINE_REPO_NAME:-local}"
build_platform="${ALPINE_BUILD_PLATFORM:-linux/amd64}"

validate_arch() {
  case "$1" in
    x86_64|aarch64) ;;
    *) printf 'unsupported Alpine architecture: %s\n' "$1" >&2; return 2 ;;
  esac
}

run_for_arch() {
  local arch="$1"
  local subcommand="$2"
  local image_name

  validate_arch "${arch}"
  image_name="${ALPINE_APK_BUILDER_IMAGE:-seaweedfs-apk-builder:${arch}}"

  docker build \
    --platform "${build_platform}" \
    --build-arg "ALPINE_VERSION=${alpine_version}" \
    --build-arg "BUILDER_UID=$(id -u)" \
    --build-arg "BUILDER_GID=$(id -g)" \
    -f "${repo_root}/scripts/apk/Dockerfile" \
    -t "${image_name}" \
    "${repo_root}"

  docker_args=(--rm --platform "${build_platform}")
  if [[ -t 0 && -t 1 ]]; then
    docker_args+=(-it)
  fi

  docker run "${docker_args[@]}" \
    -e "ALPINE_ARCH=${arch}" \
    -e "CARCH=${arch}" \
    -e "ALPINE_REPO_NAME=${repo_name}" \
    -e "PACKAGER=${PACKAGER:-Local Builder <local@example.invalid>}" \
    -v "${repo_root}:/work" \
    -v "${repo_root}/.cache/abuild:/home/builder/.abuild" \
    -v "${repo_root}/.cache/apk-distfiles:/var/cache/distfiles" \
    -v "${repo_root}/packages:/home/builder/packages" \
    "${image_name}" \
    "${subcommand}"
}

mkdir -p \
  "${repo_root}/.cache/abuild" \
  "${repo_root}/.cache/apk-distfiles" \
  "${repo_root}/packages"

case "${command_name}" in
  build-all)
    for arch in ${ALPINE_ARCHES:-x86_64 aarch64}; do
      run_for_arch "${arch}" build
    done
    ;;
  build|checksum|lint|shell)
    run_for_arch "${requested_arch}" "${command_name}"
    ;;
  *)
    printf 'unknown command: %s\n' "${command_name}" >&2
    printf 'usage: %s [build|build-all|checksum|lint|shell] [x86_64|aarch64]\n' "$0" >&2
    exit 2
    ;;
esac