begin
  require 'honeybadger'
rescue LoadError
  raise 'Gem honeybadger is required for logging purposes. Please add the gem "honeybadger" to your Gemfile.'
end

# Send log messages to honeybadger
#
# Example:
#   SemanticLogger.add_appender(appender: :honeybadger)
#
module SemanticLogger
  module Appender
    class Honeybadger < SemanticLogger::Subscriber
      # Honeybadger Appender
      #
      # Parameters
      #   level: [:trace | :debug | :info | :warn | :error | :fatal]
      #     Override the log level for this appender.
      #     Default: :error
      #
      #   formatter: [Object|Proc|Symbol|Hash]
      #     An instance of a class that implements #call, or a Proc to be used to format
      #     the output from this appender
      #     Default: Use the built-in formatter (See: #call)
      #
      #   filter: [Regexp|Proc]
      #     RegExp: Only include log messages where the class name matches the supplied.
      #     regular expression. All other messages will be ignored.
      #     Proc: Only include log messages where the supplied Proc returns true
      #           The Proc must return true or false.
      #
      #   host: [String]
      #     Name of this host to appear in log messages.
      #     Default: SemanticLogger.host
      #
      #   application: [String]
      #     Name of this application to appear in log messages.
      #     Default: SemanticLogger.application
      def initialize(level: :error, formatter: nil, filter: nil, application: nil, host: nil, &block)
        super(level: level, formatter: formatter, filter: filter, application: application, host: host, &block)
      end

      # Send an error notification to honeybadger
      def log(log)
        context = formatter.call(log, self)
        if log.exception
          context.delete(:exception)
          ::Honeybadger.notify(log.exception, context)
        else
          message             = {
            error_class:   context.delete(:name),
            error_message: context.delete(:message),
            context:       context
          }
          message[:backtrace] = log.backtrace if log.backtrace
          ::Honeybadger.notify(message)
        end
        true
      end

      private

      # Use Raw Formatter by default
      def default_formatter
        SemanticLogger::Formatters::Raw.new
      end
    end
  end
end