#!/usr/bin/env bash

# Exit on command errors and treat unset variables as an error
set -eu

source /usr/share/yunohost/helpers
source functions.sh

#
# finds maximum in a sequence of numbers, # e.g. 
# max 1 2 3 => 3
#
max() {
  local m=$1
  local other=$@

  for n in $other
  do
    if [ $n -gt $m ]; then
      m=$n
    fi
  done
  echo $m
}

# 
# returns true if first paramter is greater than second where
# parameter is in "digit-dot" format, e.g.
#
# is_new_version_available 1.2.1 1.2.0 => true
# is_new_version_available 1.2.1 1.2 => true
#
is_new_version_available() {
  local installed=( $(echo "$1" | tr '.' ' ') )
  local available=( $(echo "$2" | tr '.' ' ') ) 
  local len="$(max "${#installed[*]}" "${#available[*]}")"

  for ((i=0; i<len; i++))
  do
    [ "${installed[i]:-0}" -lt "${available[i]:-0}" ] && return 0
    [ "${installed[i]:-0}" -gt "${available[i]:-0}" ] && return 1
  done

  # both versions are equal
  return 1
}

main() {
  local app=${YNH_APP_INSTANCE_NAME}
  local deploy_path=$( ynh_app_setting_get $app deploy_path )
  local symlink_to_deploy_path=$( ynh_app_setting_get $app symlink_to_deploy_path )
  local installed_version=$( ynh_app_setting_get $app installed_version )
  local systemd_service_name=$( ynh_app_setting_get $app systemd_service_name )
  local app_config=../conf/app.src 
  local source_version=$(app_config_get $app_config "SOURCE_VERSION")

  # if is_new_version_available $installed_version $source_version; then
    local old_deploy_path=$deploy_path
    local new_deploy_path=$( make_deploy_path $app $source_version )

    obtain_and_deploy_source $app_config $new_deploy_path $symlink_to_deploy_path
    #mock_obtain_and_deploy_source $new_deploy_path $symlink_to_deploy_path

    sudo systemctl restart $systemd_service_name

    ynh_app_setting_set $app installed_version $source_version
    ynh_app_setting_set $app deploy_path $new_deploy_path

    sudo rm -rf $old_deploy_path
  #else
  #  echo "There is no new version of ZeroNet, nothing to upgrade!"
  #  ynh_die
  #fi
}

main