#!/bin/bash

# Commit changes to Git.
: "${GIT_COMMIT_PACKAGES:=false}"
# Push changes to remote.
: "${GIT_PUSH_PACKAGES:=false}"

SCRIPT_DIR="$(realpath "$(dirname "$0")")"

source "${SCRIPT_DIR}/lib/parse-conf.sh"

update-package() {
  local pkgdir="${1}"
  local pkgname="$(basename ${pkgdir})"

  if [ ! -f "${pkgdir}/built.conf" ]
  then
    return 0
  fi

  eval "$(parse-conf ${pkgdir})"

  # check the package updates from AUR
  if [ ! -f "${pkgdir}/PKGBUILD" ]
  then
    if [ -n "${AUR_NAME}" ]
    then
      if [ -n "${AUR_PKGBASE}" ]
      then
        local latest_version="latest"
        local last_updated="$(git ls-remote --quiet https://aur.archlinux.org/${AUR_NAME}.git refs/heads/master | awk '{print $1}')"
      else
        local latest_version="$(curl --location --silent "https://aur.archlinux.org/rpc/?v=5&type=info&arg=${AUR_NAME}" | jq -r '.results[0].Version')"
        local last_updated="$(curl --location --silent "https://aur.archlinux.org/rpc/?v=5&type=info&arg=${AUR_NAME}" | jq -r '.results[0].LastModified')"
      fi

      local version="${AUR_UPDATED}"

      if [[ -z "${last_updated}" || "${last_updated}" = "null" ]]
      then
        echo "[!] Failed to get latest version of ${pkgname}"
        return 1
      fi

      if [ "${version}" = "${last_updated}" ]
      then
        return 0
      fi

      sed -i "s|^\(AUR_UPDATED=\)\(.*\)\$|\1\"${last_updated}\"|g" "${pkgdir}/built.conf"

      if [ "${GIT_COMMIT_PACKAGES}" = "true" ]
      then
        git add "${pkgdir}/built.conf"
        git commit -m "upgpkg: '${pkgname}' to '${latest_version}'"
      fi

      echo "[i] Updated '${pkgname}' to '${latest_version}'"

      return 0
    fi
  fi

  if [ -f "${pkgdir}/built.conf" ]
  then
    # check the package updates from github
    if [ -n "${GITHUB_REPO}" ]
    then
      # check latest version
      if [ "${GITHUB_TAG}" = "true" ]
      then
        local latest_version="$(curl --location --silent -H "Authorization: token ${GITHUB_API_TOKEN}" "https://api.github.com/repos/${GITHUB_REPO}/tags" | jq -r '.[0].name')"
      else
        local latest_version="$(curl --silent --location -H "Authorization: token ${GITHUB_API_TOKEN}" "https://api.github.com/repos/${GITHUB_REPO}/releases/latest" | jq -r ".tag_name")"
      fi

      if [[ -z "${latest_version}" || "${latest_version}" = "null" ]]
      then
        echo "[!] Failed to get latest version of ${pkgname}"
        return 1
      fi

      custom_vars=$(
        . "${pkgdir}/PKGBUILD"
        echo "local version=${pkgver}"
      )

      eval "${custom_vars}"

      # Translate "_" into ".": some packages use underscores to seperate
      # version numbers, but we require them to be separated by dots.
      latest_version=${latest_version//_/.}

      # Remove leading 'v' or 'r'
      latest_version=${latest_version#[v,r]}

      # Translate "-" into ".": pacman does not support - in pkgver
      latest_version=${latest_version//-/.}

      if [ "${version}" = "${latest_version}" ]
      then
        return 0
      fi

      sed -i "s|^\(pkgver=\)\(.*\)\$|\1\"${latest_version}\"|g" "${pkgdir}/PKGBUILD"

      # Update package checksums
      cd "${pkgdir}"
      updpkgsums

      if [ "${GIT_COMMIT_PACKAGES}" = "true" ]
      then
        git add "${pkgdir}/PKGBUILD"
        git commit -m "upgpkg: '${pkgname}' to '${latest_version}'"
      fi

      echo "[i] Updated '${pkgname}' to '${latest_version}'"

      return 0
    fi

    if [ -n "${NPM}" ]
    then
      local latest_version="$(curl --location --silent "https://unpkg.com/${NPM}/package.json" | jq -r ".version")"

      if [[ -z "${latest_version}" || "${latest_version}" = "null" ]]
      then
        echo "[!] Failed to get latest version of ${pkgname}"
        return 1
      fi

      custom_vars=$(
        . "${pkgdir}/PKGBUILD"
        echo "local version=${pkgver}"
      )

      eval "${custom_vars}"

      if [ "${version}" = "${latest_version}" ]
      then
        return 0
      fi

      sed -i "s|^\(pkgver=\)\(.*\)\$|\1\"${latest_version}\"|g" "${pkgdir}/PKGBUILD"

      # Update package checksums
      cd "${pkgdir}"
      updpkgsums

      if [ "${GIT_COMMIT_PACKAGES}" = "true" ]
      then
        git add "${pkgdir}/PKGBUILD"
        git commit -m "upgpkg: '${pkgname}' to '${latest_version}'"
      fi

      echo "[i] Updated '${pkgname}' to '${latest_version}'"

      return 0
    fi
  fi
}

for pkgdir in ./packages/*
do
  update-package "${pkgdir}"

  EXIT_CODE="${?}"

  if ! (( ${EXIT_CODE} ))
  then
    if [ "${GIT_PUSH_PACKAGES}" = "true" ]
    then
      git pull --rebase &> /dev/null
      git push &> /dev/null
    fi
  else
    echo "[!] Failed to update package '$(basename ${pkgdir})'"
  fi
done