#-*- coding: utf-8 -*-
#
# Système de gestion des adhésions de Nos oignons
# Copyright © 2013-2014 Nos oignons <contact@nos-oignons.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

require 'singleton'
require 'tempfile'

module NosOignons
  class ReminderDb
    DEFAULT_PATH = File.expand_path('../../../var/reminders.yaml', __FILE__)

    include Singleton

    def db_path
      ENV['NOS_OIGNONS_REMINDER_DB'] || DEFAULT_PATH
    end

    def initialize
      reload!
    end

    def reload!
      # hash of email => last_reminder_date
      begin
        @reminders = YAML.load_file(db_path)
      rescue Errno::ENOENT
        @reminders = {}
      end
    end

    def save
      # save using atomic rename
      file = Tempfile.new('reminder_db', File.dirname(db_path))
      begin
        file.write(YAML.dump(@reminders))
        file.close
        File.rename file.path, db_path
      rescue
        file.unlink
        raise
      end
    end

    def last_reminder(member)
      @reminders[member.email]
    end

    def record(member)
      @reminders[member.email] = Time.now.to_date
      # Not efficient, but let's put people's mailbox as first priority
      save
    end
  end
end