#!/usr/bin/env bash

set -euo pipefail

log() {
  printf '[%s] %s\n' "$(basename "$0")" "$*"
}

die() {
  printf '[%s] %s\n' "$(basename "$0")" "$*" >&2
  exit 1
}

detect_debian_distribution_id() {
  local os_release="/etc/os-release"
  local distro_id=""
  local lsb_id=""

  if [[ -r "$os_release" ]]; then
    # shellcheck disable=SC1090
    . "$os_release"
    distro_id="${ID:-}"
  fi

  if [[ -n "$distro_id" ]]; then
    case "$distro_id" in
      ubuntu|debian)
        printf '%s\n' "$distro_id"
        return 0
        ;;
    esac
  fi

  if command -v lsb_release >/dev/null 2>&1; then
    lsb_id="$(lsb_release -is | tr '[:upper:]' '[:lower:]')"
    case "$lsb_id" in
      ubuntu|debian)
        printf '%s\n' "$lsb_id"
        return 0
        ;;
    esac
  fi

  die "Unable to determine Debian/Ubuntu distribution ID from $os_release"
}

detect_debian_distribution() {
  local os_release="/etc/os-release"
  local distro_id=""
  local version_codename=""
  local ubuntu_codename=""

  if [[ -r "$os_release" ]]; then
    # shellcheck disable=SC1090
    . "$os_release"
    distro_id="${ID:-}"
    version_codename="${VERSION_CODENAME:-}"
    ubuntu_codename="${UBUNTU_CODENAME:-}"
  fi

  case "$distro_id" in
    ubuntu)
      if [[ -n "$ubuntu_codename" ]]; then
        printf '%s\n' "$ubuntu_codename"
        return 0
      fi
      ;;
    debian)
      if [[ -n "$version_codename" ]]; then
        printf '%s\n' "$version_codename"
        return 0
      fi
      ;;
  esac

  if [[ -n "$version_codename" ]]; then
    printf '%s\n' "$version_codename"
    return 0
  fi

  if command -v lsb_release >/dev/null 2>&1; then
    lsb_release -cs
    return 0
  fi

  die "Unable to determine Debian/Ubuntu distribution codename from $os_release"
}

readonly REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
readonly BUILD_CONFIG_FILE="${BUILD_CONFIG_FILE:-$REPO_ROOT/build.config}"
readonly DEFAULT_GITEA_BASE_URL="https://git.cyber.gent"
readonly DEFAULT_DEBIAN_DISTRIBUTION="$(detect_debian_distribution)"
readonly DEFAULT_DEBIAN_COMPONENT="main"
readonly DEFAULT_CI_WORK_ROOT="$REPO_ROOT/.ci-work"

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

require_env() {
  local name="$1"
  [[ -n "${!name:-}" ]] || die "Required environment variable is missing: $name"
}

load_build_config() {
  [[ -f "$BUILD_CONFIG_FILE" ]] || die "Build config not found: $BUILD_CONFIG_FILE"

  set -a
  # shellcheck disable=SC1090
  . "$BUILD_CONFIG_FILE"
  set +a

  [[ -n "${REPO:-}" ]] || die "REPO is missing in $BUILD_CONFIG_FILE"
  [[ -n "${BRANCH:-}" ]] || die "BRANCH is missing in $BUILD_CONFIG_FILE"
}

ci_work_root() {
  printf '%s\n' "${CI_WORK_ROOT:-$DEFAULT_CI_WORK_ROOT}"
}

ci_artifacts_dir() {
  printf '%s/artifacts\n' "$(ci_work_root)"
}

ci_metadata_file() {
  printf '%s/package.env\n' "$(ci_artifacts_dir)"
}