#!/bin/bash

# Checks the app version to upgrade with the existing app version and returns:
# - UPGRADE_APP if the upstream app version has changed
# - UPGRADE_PACKAGE if only the YunoHost package has changed
#
## It stops the current script without error if the package is up-to-date
#
# This helper should be used to avoid an upgrade of an app, or the upstream part
# of it, when it's not needed
#
# To force an upgrade, even if the package is up to date,
# you have to set the variable YNH_FORCE_UPGRADE before.
# example: sudo YNH_FORCE_UPGRADE=1 yunohost app upgrade MyApp

# usage: ynh_check_app_version_changed
ynh_check_app_version_changed () {
  local force_upgrade=${YNH_FORCE_UPGRADE:-0}
  local package_check=${PACKAGE_CHECK_EXEC:-0}

  # By default, upstream app version has changed
  local return_value="UPGRADE_APP"

  local current_version=$(ynh_read_manifest "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" "version" || echo 1.0)
  local current_upstream_version="${current_version/~ynh*/}"
  local update_version=$(ynh_read_manifest "../manifest.json" "version" || echo 1.0)
  local update_upstream_version="${update_version/~ynh*/}"

  if [ "$current_version" == "$update_version" ] ; then
      # Complete versions are the same
      if [ "$force_upgrade" != "0" ]
      then
        echo "Upgrade forced by YNH_FORCE_UPGRADE." >&2
        unset YNH_FORCE_UPGRADE
      elif [ "$package_check" != "0" ]
      then
        echo "Upgrade forced for package check." >&2
      else
        ynh_die "Up-to-date, nothing to do" 0
      fi
  elif [ "$current_upstream_version" == "$update_upstream_version" ] ; then
    # Upstream versions are the same, only YunoHost package versions differ
    return_value="UPGRADE_PACKAGE"
  fi
  echo $return_value
}