# Copyright (c) 2013 AppNeta
# All rights reserved.

module Oboe
  extend OboeBase
  include Oboe_metal

  class Reporter
    ##
    # Initialize the Oboe Context, reporter and report the initialization
    #
    def self.start
      begin
        return unless Oboe.loaded

        if Oboe.reporter
          Oboe.logger.warn "[oboe/warn] Attempt to start an already started reporter..."
          return
        end

        Oboe_metal::Context.init()

        Oboe.logger.debug "[oboe/debug] Initializing Heroku based reporter."

        # The Oboe Reporter is configured via Heroku config variables.
        Oboe.reporter = Oboe_metal::Reporter.new(nil, nil)

        Oboe::API.report_init
      rescue Exception => e
        $stderr.puts e.message
        raise
      end
    end

    def self.sendReport(evt)
      Oboe.reporter.sendReport(evt) if Oboe.loaded
    end
  end

  class Event
    def self.metadataString(evt)
      evt.metadataString()
    end
  end

  class << self
    def sample?(opts = {})
      begin
        return false unless Oboe.always? && Oboe.loaded

        # Assure defaults since SWIG enforces Strings
        layer   = opts[:layer]      ? opts[:layer].strip      : ''
        xtrace  = opts[:xtrace]     ? opts[:xtrace].strip     : ''
        tv_meta = opts['X-TV-Meta'] ? opts['X-TV-Meta'].strip : ''

        rv = Oboe::Context.sampleRequest(layer, xtrace, tv_meta)

        if rv == 0
          Oboe.sample_rate = -1
          Oboe.sample_source = -1
          false
        else
          # liboboe version > 1.3.1 returning a bit masked integer with SampleRate and
          # source embedded
          Oboe.sample_rate = (rv & SAMPLE_RATE_MASK)
          Oboe.sample_source = (rv & SAMPLE_SOURCE_MASK) >> 24
          true
        end
      rescue StandardError => e
        Oboe.logger.debug "[oboe/error] sample? error: #{e.inspect}"
        false
      end
    end

    def set_tracing_mode(mode)
      return unless Oboe.loaded

      value = mode.to_sym

      case value
      when :never
        Oboe::Context.setTracingMode(OBOE_TRACE_NEVER)

      when :always
        Oboe::Context.setTracingMode(OBOE_TRACE_ALWAYS)

      when :through
        Oboe::Context.setTracingMode(OBOE_TRACE_THROUGH)

      else
        Oboe.logger.fatal "[oboe/error] Invalid tracing mode set: #{mode}"
        Oboe::Context.setTracingMode(OBOE_TRACE_THROUGH)
      end
    end

    def set_sample_rate(rate)
      if Oboe.loaded
        # Update liboboe with the new SampleRate value
        Oboe::Context.setDefaultSampleRate(rate.to_i)
      end
    end

    # Disconnect/Reconnect wrappers used for forking webservers
    # such as Unicorn or Passenger
    #
    def disconnect!
      # To avoid an issue with SSL reconnects, delay Reporter initialization
      # until after the fork is completed.  Here, do nothing for now.
    end

    def reconnect!
      Oboe::Reporter.start
    end
  end
end

Oboe.loaded = true