PRIVATEBIN_VERSION="1.1"
PRIVATEBIN_SOURCE_URL="https://github.com/PrivateBin/PrivateBin/archive/${PRIVATEBIN_VERSION}.tar.gz"
PRIVATEBIN_SOURCE_SHA256="61d18753c792d83f54ad9e414d1d32198ab873054907081e732effd5ccbe96ef"

# Substitute a string by another in a file
#
# usage: ynh_substitute_char string_to_find replace_string file_to_analyse
# | arg: string_to_find - String to replace in the file
# | arg: replace_string - New string that will replace
# | arg: file_to_analyse - File where the string will be replaced.
ynh_substitute_char () {
  delimit=@
  match_char=${1//${delimit}/"\\${delimit}"}  # Escape the delimiter if it's in the string.
  replace_char=${2//${delimit}/"\\${delimit}"}
  workfile=$3

  sudo sed --in-place "s${delimit}${match_char}${delimit}${replace_char}${delimit}g" "$workfile"
}

ynh_store_checksum_config () {
  config_file_checksum=checksum_${1//[\/ ]/_} # Replace all '/' and ' ' by '_'
  ynh_app_setting_set $app $config_file_checksum $(sudo md5sum "$1" | cut -d' ' -f1)
}

extract_source() {
  local DESTDIR=$1
    
  # retrieve and extract Roundcube tarball
  rc_tarball="${DESTDIR}/privatebin.tar.gz"
  sudo wget -q -O "$rc_tarball" "$PRIVATEBIN_SOURCE_URL" \
    || ynh_die "Unable to download source tarball"
  echo "$PRIVATEBIN_SOURCE_SHA256 $rc_tarball" | sha256sum -c >/dev/null \
    || ynh_die "Invalid checksum of downloaded tarball"
  sudo tar xf "$rc_tarball" -C "$DESTDIR" --strip-components 1 \
    || ynh_die "Unable to extract source tarball"
  sudo rm "$rc_tarball"
}

ynh_fpm_config () {
  finalphpconf="/etc/php5/fpm/pool.d/$app.conf"
  ynh_compare_checksum_config "$finalphpconf" 1
  sudo cp ../conf/php-fpm.conf "$finalphpconf"
  ynh_substitute_char "__NAMETOCHANGE__" "$app" "$finalphpconf"
  ynh_substitute_char "__FINALPATH__" "$final_path" "$finalphpconf"
  ynh_substitute_char "__USER__" "$app" "$finalphpconf"
  sudo chown root: "$finalphpconf"
  ynh_store_checksum_config "$finalphpconf"

  if [ -e "../conf/php-fpm.ini" ]
  then
    finalphpini="/etc/php5/fpm/conf.d/20-$app.ini"
    ynh_compare_checksum_config "$finalphpini" 1
    sudo cp ../conf/php-fpm.ini "$finalphpini"
    sudo chown root: "$finalphpini"
    ynh_store_checksum_config "$finalphpini"
  fi

  sudo systemctl reload php5-fpm
}

ynh_remove_fpm_config () {
  ynh_secure_remove "/etc/php5/fpm/pool.d/$app.conf"
  ynh_secure_remove "/etc/php5/fpm/conf.d/20-$app.ini"
  sudo systemctl reload php5-fpm
}

# Remove a file or a directory securely
#
# usage: ynh_secure_remove path_to_remove
# | arg: path_to_remove - File or directory to remove
ynh_secure_remove () {
  path_to_remove=$1
  forbidden_path=" \
  /var/www \
  /home/yunohost.app"

  if [[ "$forbidden_path" =~ "$path_to_remove" \
    # Match all path or subpath in $forbidden_path
    || "$path_to_remove" =~ ^/[[:alnum:]]+$ \
    # Match all first level path from / (Like /var, /root, etc...)
    || "${path_to_remove:${#path_to_remove}-1}" = "/" ]]
    # Match if the path finish by /. Because it's seems there is an empty variable
  then
    echo "Avoid deleting of $path_to_remove." >&2
  else
    if [ -e "$path_to_remove" ]
    then
      sudo rm -R "$path_to_remove"
    else
      echo "$path_to_remove doesn't deleted because it's not exist." >&2
    fi
  fi
}

# Create a system user
#
# usage: ynh_system_user_create user_name [home_dir]
# | arg: user_name - Name of the system user that will be create
# | arg: home_dir - Path of the home dir for the user. Usually the final path of the app. If this argument is omitted, the user will be created without home
ynh_system_user_create () {
  if ! ynh_system_user_exists "$1"  # Check if the user exists on the system
  then  # If the user doesn't exist
    if [ $# -ge 2 ]; then # If a home dir is mentioned
      user_home_dir="-d $2"
    else
      user_home_dir="--no-create-home"
    fi
    sudo useradd $user_home_dir --system --user-group $1 --shell /usr/sbin/nologin || ynh_die "Unable to create $1 system account"
  fi
}

# Delete a system user
#
# usage: ynh_system_user_delete user_name
# | arg: user_name - Name of the system user that will be create
ynh_system_user_delete () {
    if ynh_system_user_exists "$1"  # Check if the user exists on the system
    then
    echo "Remove the user $1" >&2
    sudo userdel $1
  else
    echo "The user $1 was not found" >&2
    fi
}

ynh_compare_checksum_config () {
  current_config_file=$1
  compress_backup=${2:-0} # If $2 is empty, compress_backup will set at 0
  config_file_checksum=checksum_${current_config_file//[\/ ]/_} # Replace all '/' and ' ' by '_'
  checksum_value=$(ynh_app_setting_get $app $config_file_checksum)
  if [ -n "$checksum_value" ]
  then  # Proceed only if a value was stocked into the app config
    if ! echo "$checksum_value $current_config_file" | md5sum -c --status
    then  # If the checksum is now different
      backup_config_file="$current_config_file.backup.$(date '+%d.%m.%y_%Hh%M,%Ss')"
      if [ compress_backup -eq 1 ]
      then
        sudo tar --create --gzip --file "$backup_config_file.tar.gz" "$current_config_file" # Backup the current config file and compress
        backup_config_file="$backup_config_file.tar.gz"
      else
        sudo cp -a "$current_config_file" "$backup_config_file" # Backup the current config file
      fi
      echo "Config file $current_config_file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_config_file" >&2
      echo "$backup_config_file"  # Return the name of the backup file
    fi
  fi
}