module MailSpy
  class CoreMailer < ActionMailer::Base
    helper "mail_spy/email"

    def template(email)
      # Slight hack to provide information to helpers
      @_email_id = email.id
      @template_values = email.template_values
      email_hash = {}


      # Evaluate the subject line as erb
      if email.subject.present?
        subject = ERB.new(email.subject).result(binding)
        email_hash[:subject] =  subject
      end

      # Set Headers
      std_email_keys = [:to, :cc, :bcc, :from, :message_id, :sender, :reply_to]
      std_email_keys.each { |key| set_if_present(email_hash,email, key) }
      headers.merge!(email.headers) if email.headers.present?

      mail_message = mail(email_hash) do |format|
        format.text { render :inline => email.text_erb }
        format.html { render :inline => email.html_erb }
      end

      # Email Service provider setup
      # TODO Only support smtp at the moment
      raise "No Email service providers installed" unless MailSpy.esps.present?
      esp = MailSpy.esps[email.email_service_provider]
      esp_key = MailSpy.esps.keys[rand(MailSpy.esps.keys.count)]
      esp = MailSpy.esps[esp_key] if esp.blank?

      mail_message.delivery_method.settings.merge!(
        {
          :address => esp.address,
          :user_name => esp.user_name,
          :password => esp.password,
          :port => esp.port,
          :authentication => esp.authentication,
          :enable_starttls_auto => esp.enable_starttls_auto,
          :domain => esp.domain
        })

      mail_message
    end


    protected

    def set_if_present(email_hash, email, hash_key, email_key=nil)
      email_key = hash_key if email_key.nil?
      value = email.send("#{email_key}")
      email_hash[hash_key] = value if value.present?
    end
  end
end