grecia/app/mailers/mailer.rb

class Mailer < ApplicationMailer
  after_action :prevent_delivery_to_users_without_email

  helper :text_with_links
  helper :users

  def comment(comment)
    @comment = comment
    @commentable = comment.commentable
    @email_to = @commentable.author.email
    manage_subscriptions_token(@commentable.author)

    with_user(@commentable.author) do
      subject = t(
        "mailers.comment.subject",
        commentable: t("activerecord.models.#{@commentable.class.name.underscore}", count: 1).downcase
      )
      mail(to: @email_to, subject: subject) if @commentable.present? && @commentable.author.present?
    end
  end

  def reply(reply)
    @email = ReplyEmail.new(reply)
    @email_to = @email.to
    manage_subscriptions_token(@email.recipient)

    with_user(@email.recipient) do
      mail(to: @email_to, subject: @email.subject) if @email.can_be_sent?
    end
  end

  def email_verification(user, recipient, token, document_type, document_number)
    @user = user
    @email_to = recipient
    @token = token
    @document_type = document_type
    @document_number = document_number

    with_user(user) do
      mail(to: @email_to, subject: t("mailers.email_verification.subject"))
    end
  end

  def direct_message_for_receiver(direct_message)
    @direct_message = direct_message
    @receiver = @direct_message.receiver
    @email_to = @receiver.email
    manage_subscriptions_token(@receiver)

    with_user(@receiver) do
      mail(to: @email_to, subject: t("mailers.direct_message_for_receiver.subject"))
    end
  end

  def direct_message_for_sender(direct_message)
    @direct_message = direct_message
    @sender = @direct_message.sender
    @email_to = @sender.email

    with_user(@sender) do
      mail(to: @email_to, subject: t("mailers.direct_message_for_sender.subject"))
    end
  end

  def proposal_notification_digest(user, notifications)
    @notifications = notifications
    @email_to = user.email
    manage_subscriptions_token(user)

    with_user(user) do
      mail(to: @email_to,
           subject: t("mailers.proposal_notification_digest.title", org_name: Setting["org_name"]))
    end
  end

  def user_invite(email)
    @email_to = email

    I18n.with_locale(Setting.default_locale) do
      mail(to: @email_to, subject: t("mailers.user_invite.subject", org_name: Setting["org_name"]))
    end
  end

  def budget_investment_created(investment)
    @investment = investment
    @email_to = @investment.author.email

    with_user(@investment.author) do
      mail(to: @email_to, subject: t("mailers.budget_investment_created.subject"))
    end
  end

  def budget_investment_unfeasible(investment)
    @investment = investment
    @author = investment.author
    @email_to = @author.email

    with_user(@author) do
      mail(to: @email_to, subject: t("mailers.budget_investment_unfeasible.subject", code: @investment.code))
    end
  end

  def budget_investment_selected(investment)
    @investment = investment
    @author = investment.author
    @email_to = @author.email

    with_user(@author) do
      mail(to: @email_to, subject: t("mailers.budget_investment_selected.subject", code: @investment.code))
    end
  end

  def budget_investment_unselected(investment)
    @investment = investment
    @author = investment.author
    @email_to = @author.email

    with_user(@author) do
      mail(to: @email_to, subject: t("mailers.budget_investment_unselected.subject", code: @investment.code))
    end
  end

  def newsletter(newsletter, recipient_email)
    @newsletter = newsletter
    @email_to = recipient_email
    manage_subscriptions_token(User.find_by(email: @email_to))

    mail(to: @email_to, from: @newsletter.from, subject: @newsletter.subject)
  end

  def evaluation_comment(comment, to)
    @email = EvaluationCommentEmail.new(comment)
    @email_to = to

    mail(to: @email_to.email, subject: @email.subject) if @email.can_be_sent?
  end

  def machine_learning_error(user)
    @email_to = user.email

    mail(to: @email_to, subject: t("mailers.machine_learning_error.subject"))
  end

  def machine_learning_success(user)
    @email_to = user.email

    mail(to: @email_to, subject: t("mailers.machine_learning_success.subject"))
  end

  def already_confirmed(user)
    @email_to = user.email
    @user = user

    with_user(@user) do
      mail(to: @email_to, subject: t("mailers.already_confirmed.subject"))
    end
  end

  private

    def with_user(user, &)
      I18n.with_locale(user.locale, &)
    end

    def prevent_delivery_to_users_without_email
      if @email_to.blank?
        mail.perform_deliveries = false
      end
    end

    def manage_subscriptions_token(user)
      user.add_subscriptions_token
      @token = user.subscriptions_token
    end
end