begin
  require 'email_format'
rescue LoadError
  raise "You need to add gem 'email_format' to your Gemfile if you wish to use it."
end

#
# Objects that emails can be sent too...
#
module EmailAble
  extend ActiveSupport::Concern
  include App47Logger

  def self.included(base)
    base.class_eval do
      field :email, type: String
      field :email_bounced_at, type: Time
      field :email_bounce_reason, type: String
      field :unconfirmed_email, type: String
      field :email_enabled, type: Boolean, default: true
      #
      # Validations
      #
      validates :email, email_format: { strict: true }, allow_blank: true
      #
      # Callbacks
      #
      before_validation :downcase_email
    end
  end

  #
  # Support legacy apps with old name
  #
  def email_bounce_date(date = nil)
    self.email_bounced_at = date if date.present?
    email_bounced_at
  end

  #
  # Is this a valid email to send to?
  #
  def valid_email?
    email_enabled? && !email_bounced?
  end

  #
  # Has the email bounced?
  #
  def email_bounced?
    email_bounced_at.present?
  end

  #
  # Set the email to a bounced status with the given reason
  #
  def bounced(reason)
    set email_bounced_at: Time.now.utc, email_bounce_reason: reason
  end

  #
  # Reset the bounced email
  #
  def reset_bounce_status(current_member = nil)
    return unless SystemConfiguration.mail_gun_configured? && email_bounced?

    reset_url = "https://api.mailgun.net/v3/#{SystemConfiguration.smtp_domain}/bounces/#{CGI.escape(email)}"
    RestClient.delete(reset_url, user: 'api', password: SystemConfiguration.mailgun_api_key)
  rescue RestClient::Exception => error
    log_error "Unable to reset email bounce status: #{inspect}", error
  ensure
    if current_member.present?
      update_and_log current_member, email_bounced_at: nil, email_bounce_reason: nil
    else
      set email_bounced_at: nil, email_bounce_reason: nil
    end
  end

  #
  # Return the gravatar URL based on email address
  #
  def gravatar_url(size = '32', default = 'mm')
    self.email ||= 'noone@abc.com'
    if SystemConfiguration.fips_mode?
      "https://www.gravatar.com/avatar/#{Digest::SHA2.hexdigest(email)}?s=#{size}&d=#{default}"
    else
      "https://www.gravatar.com/avatar/#{Digest::MD5.hexdigest(email)}?s=#{size}&d=#{default}"
    end
  end

  private

  #
  # Make sure emails are always downcased
  #
  def downcase_email
    self.email = email.strip.downcase if email.present?
  end
end