#!/bin/bash

# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020-present Team LibreELEC (https://libreelec.tv)

set -e

. config/options ""

# check if depends are available
command -v curl >/dev/null 2>&1 || die "please install curl"
command -v jq >/dev/null 2>&1 || die "please install jq"

# global vars
PACKAGES_CURRENT=""
PACKAGES_IGNORED=""
PACKAGES_NOT_REGISTERED=""
github_api_token=""
github_api="no"

test_github_api() {
# check for github user and token present at ~/.libreelec/options to activate github api checks
  if [[ -n "${github_token}" || -n "${github_user}" ]]; then
    github_api_token="-u ${github_user}:${github_token}"
    # check if token works
    if curl -sL -I "${github_api_token}" https://api.github.com/user | grep -q -e "^[Ss]tatus: 200" -e "^HTTP/2 200"; then
      echo "Github api usage activated"
      github_api="yes"
    else
      message="\n your Github token is not working\n"
      message+=" github_token=${github_token}\n"
      message+=" github_user=${github_user}\n"
      die "${message}"
    fi
  else
    message="\n | Github API not in use. Some features are disabled.\n"
    message+=" |==============================================================================\n"
    message+=" | Create your \"Personal access token\" here: https://github.com/settings/tokens\n"
    message+=" | Add your token and username to ~/.libreelec/options\n"
    message+=" | github_token=\"your_github_token_here\"\n"
    message+=" | github_user=\"your_github_username_here\"\n"
    echo -e "${message}"
  fi
}

check_for_update() {
  local PKG_NAME PKG_URL PKG_VERSION RMO_API_RESPONSE GH_API_TAG

  # source variables from package.mk
  PKG_NAME="$(grep -oP -m 1 '(?<=PKG_NAME=\").*(?=\")' ${1} || true)"
  PKG_VERSION="$(grep -oP -m 1 '(?<=PKG_VERSION=\").*(?=\")' ${1} || true)"
  eval PKG_URL="$(grep -oP -m 1 '(?<=PKG_URL=\").*(?=\")' ${1} || true)"

  # check if version and url are empty or self hosted by us and ignore those packages
  if [ -z "${PKG_VERSION}" ] || [ -z "${PKG_URL}" ] || [[ "${PKG_URL}" == "$DISTRO_SRC"* ]]; then
    PACKAGES_IGNORED+="${PKG_NAME} "
    return
  fi

  # check if package exists at tracker
  RMO_API_RESPONSE=$(curl -sL "https://release-monitoring.org/api/project/LibreELEC/${PKG_NAME}" || true)
  upstream_version=$(echo "${RMO_API_RESPONSE}" | jq -r '.version')

  # look for alternative versions if necessary
  if [ "${upstream_version}" = "null" ]; then
    if [[ $(echo "${RMO_API_RESPONSE}" | jq -r '.error') =~ "No package" ]]; then
      # pkg is on github, uses githash for version, and github api available
      if [[ ${PKG_URL} =~ ^.*(github\.com).*$ ]] && \
         [[ ${PKG_VERSION} =~ ^[a-z0-9]{40} ]] && \
         [[ "${github_api}" = "yes" ]]; then

        github_repos=$(echo "${PKG_URL}" | grep -oP '(?<=https:\/\/github.com\/)?[0-9A-Za-z._-]+\/[0-9A-Za-z._-]+(?=/archive|/tags|/releases)')
        le_master_version_date="Commit date: $(curl -sL ${github_api_token} https://api.github.com/repos/${github_repos}/git/commits/${PKG_VERSION} | jq -r '.committer.date')"
        upstream_latest_commit=$(curl -sL "${github_api_token}" "https://api.github.com/repos/${github_repos}/git/refs/heads/master" | jq -r '.object.url')
        upstream_latest_commit_date=$(curl -sL "${github_api_token}" "${upstream_latest_commit}" | jq -r '.committer.date')
        GH_API_TAG=$(curl -sL "${github_api_token}" "https://api.github.com/repos/${github_repos}/tags")
        upstream_latest_tag=$(echo "${GH_API_TAG}" | jq -r '.[0].name')
        upstream_latest_tag_url=$(echo "${GH_API_TAG}" | jq -r '.[0].commit.url')
        upstream_latest_tag_date=$(curl -sL "${github_api_token}" "${upstream_latest_tag_url}" | jq -r '.commit.committer.date')

        # compare upstream with local version
        if [ "${PKG_VERSION}" != "${upstream_latest_commit##*/}" ]; then
          # get upstream tag informations
          if [ "${upstream_latest_tag}" != "null" ]; then
            tag=" | TAG: ${upstream_latest_tag} (${upstream_latest_tag_date%T*})"
          else
            tag=" | TAG: no tags"
          fi
          upstream_version="Master: ${upstream_latest_commit_date%T*}${tag}"
          PKG_VERSION="${le_master_version_date%T*}"
        else
          upstream_version="${upstream_latest_commit##*/}"
        fi
      else
        # package is not on tracker or github
        PACKAGES_NOT_REGISTERED+="${PKG_NAME} "
        return
      fi
    else
      # package exist at tracker but has no version
      upstream_version="! broken at release tracker !"
    fi
  fi

  # print version output line
  if [ "${PKG_VERSION}" != "${upstream_version}" ]; then
    printf "%-35s | %-40s | %-20s" "${PKG_NAME}" "${PKG_VERSION}" "${upstream_version}"; printf '\n'
  else
    PACKAGES_CURRENT+="${PKG_NAME} "
  fi
}


# create list of packages
if [ -n "${1}" ]; then
  PACKAGE_LIST="$(find packages/ -type d -name ${1})/package.mk"
  if [ ! -f "${PACKAGE_LIST}" ]; then
    die "Package not found: ${1}"
  fi
else
  PACKAGE_LIST="$(find packages/ -type f -name package.mk \
    ! -path "packages/addons/addon-depends/adafruit-libraries-depends/*" \
    ! -path "packages/emulation/*" \
    ! -path "packages/linux/*" \
    ! -path "packages/mediacenter/*" \
    | awk '{FS="/" ; $0=$0 ; print $(NF-1)"|"$0}' | sort | cut -d"|" -f2 \
    )"
fi

# test github api availability
test_github_api

# output
echo -e "\nUpdates found:\n"
printf "%-35s | %-40s | %-20s" "Package" "LE git master" "upstream location"; printf '\n'
echo -e ''$_{1..140}'\b-'

for check_version in ${PACKAGE_LIST}; do
  check_for_update "${check_version}"
done

echo ""
if [ -n "${PACKAGES_CURRENT}" ]; then
  echo -e "\nCurrent $(echo ${PACKAGES_CURRENT} | wc -w):\n${PACKAGES_CURRENT}\n"
fi
if [ -n "${PACKAGES_IGNORED}" ]; then
  echo -e "\nIgnored $(echo ${PACKAGES_IGNORED} | wc -w):\n${PACKAGES_IGNORED}"
fi
if [ -n "${PACKAGES_NOT_REGISTERED}" ]; then
  echo -e "\nPackages not known at tracker $(echo ${PACKAGES_NOT_REGISTERED} | wc -w):\n${PACKAGES_NOT_REGISTERED}\n"
fi