module ExceptionNotifier::EmailNotifier::Mailer

def self.extended(base)
  base.class_eval do
    # Append application view path to the ExceptionNotifier lookup context.
    self.append_view_path "#{File.dirname(__FILE__)}/views"
    def exception_notification(env, exception, options={}, default_options={})
      load_custom_views
      @env        = env
      @exception  = exception
      @options    = options.reverse_merge(env['exception_notifier.options'] || {}).reverse_merge(default_options)
      @kontroller = env['action_controller.instance'] || MissingController.new
      @request    = ActionDispatch::Request.new(env)
      @backtrace  = exception.backtrace ? clean_backtrace(exception) : []
      @sections   = @options[:sections]
      @data       = (env['exception_notifier.exception_data'] || {}).merge(options[:data] || {})
      @sections   = @sections + %w(data) unless @data.empty?
      compose_email
    end
    def background_exception_notification(exception, options={}, default_options={})
      load_custom_views
      @exception = exception
      @options   = options.reverse_merge(default_options)
      @backtrace = exception.backtrace || []
      @sections  = @options[:background_sections]
      @data      = options[:data] || {}
      compose_email
    end
    private
    def compose_subject
      subject = "#{@options[:email_prefix]}"
      subject << "#{@kontroller.controller_name}##{@kontroller.action_name}" if @kontroller
      subject << " (#{@exception.class})"
      subject << " #{@exception.message.inspect}" if @options[:verbose_subject]
      subject = EmailNotifier.normalize_digits(subject) if @options[:normalize_subject]
      subject.length > 120 ? subject[0...120] + "..." : subject
    end
    def set_data_variables
      @data.each do |name, value|
        instance_variable_set("@#{name}", value)
      end
    end
    def clean_backtrace(exception)
      if defined?(Rails) && Rails.respond_to?(:backtrace_cleaner)
        Rails.backtrace_cleaner.send(:filter, exception.backtrace)
      else
        exception.backtrace
      end
    end
    helper_method :inspect_object
    def inspect_object(object)
      case object
        when Hash, Array
          object.inspect
        else
          object.to_s
      end
    end
    def html_mail?
      @options[:email_format] == :html
    end
    def compose_email
      set_data_variables
      subject = compose_subject
      name = @env.nil? ? 'background_exception_notification' : 'exception_notification'
      headers = {
          :delivery_method => @options[:delivery_method],
          :to => @options[:exception_recipients],
          :from => @options[:sender_address],
          :subject => subject,
          :template_name => name
      }.merge(@options[:email_headers])
      mail = mail(headers) do |format|
        format.text
        format.html if html_mail?
      end
      mail.delivery_method.settings.merge!(@options[:mailer_settings]) if @options[:mailer_settings]
      mail
    end
    def load_custom_views
      self.prepend_view_path Rails.root.nil? ? "app/views" : "#{Rails.root}/app/views" if defined?(Rails)
    end
  end
end

def background_exception_notification(exception, options={}, default_options={})
  load_custom_views
  @exception = exception
  @options   = options.reverse_merge(default_options)
  @backtrace = exception.backtrace || []
  @sections  = @options[:background_sections]
  @data      = options[:data] || {}
  compose_email
end

def clean_backtrace(exception)
  if defined?(Rails) && Rails.respond_to?(:backtrace_cleaner)
    Rails.backtrace_cleaner.send(:filter, exception.backtrace)
  else
    exception.backtrace
  end
end

def compose_email
  set_data_variables
  subject = compose_subject
  name = @env.nil? ? 'background_exception_notification' : 'exception_notification'
  headers = {
      :delivery_method => @options[:delivery_method],
      :to => @options[:exception_recipients],
      :from => @options[:sender_address],
      :subject => subject,
      :template_name => name
  }.merge(@options[:email_headers])
  mail = mail(headers) do |format|
    format.text
    format.html if html_mail?
  end
  mail.delivery_method.settings.merge!(@options[:mailer_settings]) if @options[:mailer_settings]
  mail
end

def compose_subject
  subject = "#{@options[:email_prefix]}"
  subject << "#{@kontroller.controller_name}##{@kontroller.action_name}" if @kontroller
  subject << " (#{@exception.class})"
  subject << " #{@exception.message.inspect}" if @options[:verbose_subject]
  subject = EmailNotifier.normalize_digits(subject) if @options[:normalize_subject]
  subject.length > 120 ? subject[0...120] + "..." : subject
end

def exception_notification(env, exception, options={}, default_options={})
  load_custom_views
  @env        = env
  @exception  = exception
  @options    = options.reverse_merge(env['exception_notifier.options'] || {}).reverse_merge(default_options)
  @kontroller = env['action_controller.instance'] || MissingController.new
  @request    = ActionDispatch::Request.new(env)
  @backtrace  = exception.backtrace ? clean_backtrace(exception) : []
  @sections   = @options[:sections]
  @data       = (env['exception_notifier.exception_data'] || {}).merge(options[:data] || {})
  @sections   = @sections + %w(data) unless @data.empty?
  compose_email
end

def html_mail?
  @options[:email_format] == :html
end

def inspect_object(object)
  case object
    when Hash, Array
      object.inspect
    else
      object.to_s
  end
end

def load_custom_views
  self.prepend_view_path Rails.root.nil? ? "app/views" : "#{Rails.root}/app/views" if defined?(Rails)
end

def set_data_variables
  @data.each do |name, value|
    instance_variable_set("@#{name}", value)
  end
end