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

repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
# shellcheck source=scripts/apk/package-lib.sh
source "${repo_root}/scripts/apk/package-lib.sh"

mode="${APK_UPDATE_CHECK_MODE:-warn}"
if [[ "${mode}" != "warn" && "${mode}" != "fail" ]]; then
  printf 'APK_UPDATE_CHECK_MODE must be warn or fail\n' >&2
  exit 2
fi

github_latest_release() {
  local repo="$1"
  local api_url="https://api.github.com/repos/${repo}/releases/latest"
  local response

  response="$(curl -fsSL \
    -H 'Accept: application/vnd.github+json' \
    -H 'X-GitHub-Api-Version: 2022-11-28' \
    "${api_url}" 2>/dev/null)" || return 1

  printf '%s\n' "${response}" \
    | sed -n 's/^[[:space:]]*"tag_name":[[:space:]]*"\([^"]*\)".*/\1/p' \
    | head -n 1
}

apkbuild_value() {
  local package_dir="$1"
  local key="$2"

  awk -F= -v key="${key}" '
    $1 == key {
      value = $2
      gsub(/["'\'']/, "", value)
      gsub(/^[ \t]+|[ \t]+$/, "", value)
      print value
      exit
    }
  ' "${package_dir}/APKBUILD"
}

load_update_metadata() {
  local package_dir="$1"
  local metadata="${package_dir}/update-check.conf"

  provider=""
  repo=""
  version_prefix="v"

  if [[ ! -f "${metadata}" ]]; then
    return 1
  fi

  # shellcheck source=/dev/null
  source "${metadata}"

  if [[ "${provider}" != "github" || -z "${repo}" ]]; then
    return 1
  fi
}

normalize_version() {
  local version="$1"
  local prefix="$2"

  case "${prefix}" in
    none|"")
      printf '%s\n' "${version}"
      ;;
    *)
      printf '%s\n' "${version#"${prefix}"}"
      ;;
  esac
}

version_is_newer() {
  local latest="$1"
  local current="$2"
  local apk_result
  local sorted

  if [[ "${latest}" == "${current}" ]]; then
    return 1
  fi

  if command -v apk >/dev/null 2>&1; then
    apk_result="$(apk version -t "${latest}-r0" "${current}-r0" 2>/dev/null || true)"
    [[ "${apk_result}" == ">" ]]
    return
  fi

  if sort -V </dev/null >/dev/null 2>&1; then
    sorted="$(printf '%s\n%s\n' "${current}" "${latest}" | sort -V | tail -n 1)"
    [[ "${sorted}" == "${latest}" && "${latest}" != "${current}" ]]
    return
  fi

  return 0
}

printf '%-14s %-14s %-14s %-18s %s\n' "PACKAGE" "CURRENT" "LATEST" "STATUS" "UPSTREAM"

has_update=0
has_unknown=0

while IFS= read -r package_dir; do
  apk_validate_package_dir "${package_dir}"

  package_name="$(apk_package_name "${package_dir}")"
  current_version="$(apkbuild_value "${package_dir}" "pkgver")"
  status="unknown"
  latest_version="-"
  upstream_url="-"

  if load_update_metadata "${package_dir}"; then
    upstream_url="https://github.com/${repo}/releases"
    if latest_tag="$(github_latest_release "${repo}")" && [[ -n "${latest_tag}" ]]; then
      latest_version="$(normalize_version "${latest_tag}" "${version_prefix}")"
      if version_is_newer "${latest_version}" "${current_version}"; then
        status="update-available"
        has_update=1
      else
        status="current"
      fi
    else
      has_unknown=1
    fi
  else
    has_unknown=1
  fi

  printf '%-14s %-14s %-14s %-18s %s\n' \
    "${package_name}" \
    "${current_version:-"-"}" \
    "${latest_version}" \
    "${status}" \
    "${upstream_url}"
done < <(apk_package_dirs "${repo_root}")

if [[ "${mode}" == "fail" && ( "${has_update}" -ne 0 || "${has_unknown}" -ne 0 ) ]]; then
  exit 1
fi