# frozen_string_literal: true

#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See COPYRIGHT and LICENSE files for more details.
#++

# Redmine - project management software
# Copyright (C) 2006-2009  Jean-Philippe Lang
# Adapted to fit needs for mOTP
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module Token
  class Base < ApplicationRecord
    self.table_name = "tokens"
    serialize :data, coder: ::Serializers::IndifferentHashSerializer

    # Tokens belong to a user and are unique per type
    belongs_to :user, optional: false

    # Create a plain and hashed value when creating a new token
    after_initialize :initialize_values

    # Ensure uniqueness of the token value
    validates :value, presence: true
    validates :value, uniqueness: true

    # Delete previous token of this type upon save
    before_save :delete_previous_token

    class << self
      ##
      #  A DSL method allowing to define a prefix for all generated tokens, making it possible to recognize
      # the purpose of a token by looking at the token value.
      #
      #     class MyToken < HashedToken
      #       prefix :my
      #     end
      def prefix(value = nil)
        @prefix = value.to_s if value

        @prefix
      end

      ##
      # Find a token from the token value
      def find_by_plaintext_value(input)
        find_by(value: input)
      end

      ##
      # Find tokens for the given user
      def for_user(user)
        where(user:)
      end

      ##
      # Generate a random hex token value
      def generate_token_value
        [prefix, SecureRandom.hex(32)].compact.join("-")
      end
    end

    ##
    # Get the value for the token.
    def display_value
      value
    end

    protected

    ##
    # Allows only a single value of the token?
    def single_value?
      true
    end

    # Removes obsolete tokens (same user and action)
    def delete_previous_token
      if single_value? && user
        self.class.where(user_id: user.id, type:).delete_all
      end
    end

    def initialize_values
      if new_record? && !value.present?
        self.value = self.class.generate_token_value
      end
    end
  end
end