class MailTemplate < ApplicationRecord
  include Auditable
  include HtmlBlankable

  belongs_to :project, optional: true
  has_many :mailings, dependent: :nullify
  has_many :mailings_as_b, class_name: "Mailing", foreign_key: :mail_template_b_id, dependent: :nullify

  clears_blank_html :body_html
  validates :name, :subject, :body_html, presence: true

  scope :for_project, ->(project) {
    where(project_id: [nil, project&.id].compact).order(:name)
  }

  def preview_html(organization: nil, contact: nil, project: nil, opportunity: nil)
    MailMerge.render(body_html, organization:, contact:, project:, opportunity:)
  end
end