module MailEngine
  class Engine < Rails::Engine
    require 'mail_engine'
    require 'carrierwave'
    require 'kaminari'
    require 'deep_cloneable'
    require 'liquid'
    require 'mail_engine/liquid_view_patch/liquid_view'

    initializer "mail_engine" do
      ActionMailer::Base.send(:include, MailEngine::Sendgrid::Base)
      require 'mail_engine/action_mailer_patch'
    end

    initializer "mail_engine.register_liquid_template" do
      ActionView::Template.register_template_handler(:liquid, LiquidView)
    end

    initializer "mail_engine.register_database_template" do
      ActionMailer::Base.layout "layouts/mail_engine/mail_template_layouts/none"
      ActionMailer::Base.send(:prepend_view_path, MailEngine::MailTemplateResolver.instance)
    end

    initializer "mail_engine.add_acts_as_mail_receiver" do
      ActiveRecord::Base.send(:include, MailEngine::ActsAsMailReceiver)
    end

    rake_tasks do
      load "mail_engine/tasks/sendmail.rake"
      load "mail_engine/tasks/export_mail_engine_database.rake"
    end

    generators do
      require 'mail_engine/generators/install.rb'
      require 'mail_engine/generators/create_config.rb'
      require 'mail_engine/generators/copy_resources.rb'
      require 'mail_engine/generators/copy_migrations.rb'
    end

    config.to_prepare do
      # load config
      MailEngine::Configuration.load

      # don't process config file if not fine it.
      if MailEngine::Base.current_config.present?
        raise "Please add :user_class_name config into mail_engine_config.yml." if MailEngine::Base.current_config["user_class_name"].blank?
        MailEngine::USER_MODEL = MailEngine::Base.current_config["user_class_name"].constantize unless defined?(MailEngine::USER_MODEL)
      else
        puts "\e[1;31;40m[Mail Engine Warning]\e[0m Not found mail_engine_config.yml, so mail_engine won't be able to work."
      end
    end
  end
end