#!/bin/bash

#=================================================
# COMMON VARIABLES
#=================================================
# App package root directory should be the parent folder
PKG_DIR=$(cd ../; pwd)
RESTIC_VERSION="0.10.0"

# Install restic if restic is not here
install_restic () {
  architecture=$(uname -m)
  arch=''
  case $architecture in
    i386|i686)
      arch="386"
      ;;
    x86_64)
      arch=amd64
      ;;
    armv*)
      arch=arm
      ;;
    *)
      echo "Unsupported architecture \"$architecture\""
      exit 1
      ;;
  esac
  wget https://github.com/restic/restic/releases/download/v${RESTIC_VERSION}/restic_${RESTIC_VERSION}_linux_${arch}.bz2 -O /tmp/restic.bz2 2>&1 >/dev/null
  wget https://github.com/restic/restic/releases/download/v${RESTIC_VERSION}/SHA256SUMS -O /tmp/restic-sha256sums 2>&1 >/dev/null
  expected_sum=$(grep restic_${RESTIC_VERSION}_linux_${arch}.bz2 /tmp/restic-sha256sums | awk '{print $1}')
  sum=$(sha256sum /tmp/restic.bz2 | awk '{print $1}')
  if [ "$sum" == "$expected_sum" ];then
    pkill restic || true
    bunzip2 /tmp/restic.bz2 -f -c > /usr/local/bin/restic
    chmod +x /usr/local/bin/restic
  else
    echo -e "\e[91m \e[1m"
    echo -e "\nDownloaded file does not match expected sha256 sum, aborting"
    echo -e "\e[22m"
    exit 1
  fi
}

#=================================================
# COMMON HELPERS
#=================================================
ynh_export () {
  local ynh_arg=""
  for var in $@;
  do
    ynh_arg=$(echo $var | awk '{print toupper($0)}')
    if [ "$var" == "path_url" ]; then
      ynh_arg="PATH"
    fi
    ynh_arg="YNH_APP_ARG_$ynh_arg"
    export $var="${!ynh_arg}"
  done
}
# Save listed var in YunoHost app settings
# usage: ynh_save_args VARNAME1 [VARNAME2 [...]]
ynh_save_args () {
  for var in $@;
  do
    local setting_var="$var"
    if [ "$var" == "path_url" ]; then
      setting_var="path"
    fi
    ynh_app_setting_set $app $setting_var "${!var}"
  done
}

# Render templates with Jinja2
#
# Attention : Variables should be exported before calling this helper to be
# accessible inside templates.
#
# usage: ynh_render_template some_template output_path
# | arg: some_template - Template file to be rendered
# | arg: output_path   - The path where the output will be redirected to
ynh_render_template() {
   local template_path=$1
   local output_path=$2
   # Taken from https://stackoverflow.com/a/35009576
   python3 -c 'import os, sys, jinja2; sys.stdout.write(
          jinja2.Template(sys.stdin.read()
         ).render(os.environ));' < $template_path > $output_path
}

ynh_configure () {
  ynh_backup_if_checksum_is_different $2
  ynh_render_template "${PKG_DIR}/conf/$1.j2" "$2"
  ynh_store_file_checksum $2
}

# Remove any logs for all the following commands.
#
# usage: ynh_print_OFF
# WARNING: You should be careful with this helper, and never forgot to use ynh_print_ON as soon as possible to restore the logging.
ynh_print_OFF () {
	set +x
}

# Restore the logging after ynh_print_OFF
#
# usage: ynh_print_ON
ynh_print_ON () {
	set -x
	# Print an echo only for the log, to be able to know that ynh_print_ON has been called.
	echo ynh_print_ON > /dev/null
}

# Send an email to inform the administrator
#
# usage: ynh_send_readme_to_admin app_message [recipients]
# | arg: app_message - The message to send to the administrator.
# | arg: recipients - The recipients of this email. Use spaces to separate multiples recipients. - default: root
#	example: "root admin@domain"
#	If you give the name of a YunoHost user, ynh_send_readme_to_admin will find its email adress for you
#	example: "root admin@domain user1 user2"
ynh_send_readme_to_admin() {
	local app_message="${1:-...No specific information...}"
	local recipients="${2:-root}"

	# Retrieve the email of users
	find_mails () {
		local list_mails="$1"
		local mail
		local recipients=" "
		# Read each mail in argument
		for mail in $list_mails
		do
			# Keep root or a real email address as it is
			if [ "$mail" = "root" ] || echo "$mail" | grep --quiet "@"
			then
				recipients="$recipients $mail"
			else
				# But replace an user name without a domain after by its email
				if mail=$(ynh_user_get_info "$mail" "mail" 2> /dev/null)
				then
					recipients="$recipients $mail"
				fi
			fi
		done
		echo "$recipients"
	}
	recipients=$(find_mails "$recipients")

	local mail_subject="☁️🆈🅽🅷☁️: \`$app\` was just installed!"

	local mail_message="This is an automated message from your beloved YunoHost server.
Specific information for the application $app.
$app_message
---
Automatic diagnosis data from YunoHost
$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')"

	# Define binary to use for mail command
	if [ -e /usr/bin/bsd-mailx ]
	then
		local mail_bin=/usr/bin/bsd-mailx
	else
		local mail_bin=/usr/bin/mail.mailutils
	fi

	# Send the email to the recipients
	echo "$mail_message" | $mail_bin -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
}

# Read the value of a key in a ynh manifest file
#
# usage: ynh_read_manifest manifest key
# | arg: manifest - Path of the manifest to read
# | arg: key - Name of the key to find
ynh_read_manifest () {
	manifest="$1"
	key="$2"
	python3 -c "import sys, json;print(json.load(open('$manifest', encoding='utf-8'))['$key'])"
}


# 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
}

ynh_debian_release () {
	lsb_release --codename --short
}

is_stretch () {
	if [ "$(ynh_debian_release)" == "stretch" ]
	then
		return 0
	else
		return 1
	fi
}

is_jessie () {
	if [ "$(ynh_debian_release)" == "jessie" ]
	then
		return 0
	else
		return 1
	fi
}