module Timeasure

# File lib/timeasure.rb, line 13
def configuration
  @configuration ||= Configuration.new
end

# File lib/timeasure.rb, line 9
def configure
  yield(configuration)
end

# File lib/timeasure.rb, line 17
def included(base_class)
  base_class.extend ClassMethods

  instance_interceptor = const_set(instance_interceptor_name_for(base_class), interceptor_module_for(base_class))
  class_interceptor = const_set(class_interceptor_name_for(base_class), interceptor_module_for(base_class))

  return unless timeasure_enabled?

  base_class.prepend instance_interceptor
  base_class.singleton_class.prepend class_interceptor
end

# File lib/timeasure.rb, line 29
def measure(klass_name: nil, method_name: nil, segment: nil, metadata: nil)
  t0 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  block_return_value = yield if block_given?
  t1 = Process.clock_gettime(Process::CLOCK_MONOTONIC)

  begin
    measurement = Timeasure::Measurement.new(klass_name: klass_name.to_s, method_name: method_name.to_s,
                                             segment: segment, metadata: metadata, t0: t0, t1: t1)
    Timeasure.configuration.post_measuring_proc.call(measurement)
  rescue => e
    Timeasure.configuration.rescue_proc.call(e, klass_name)
  end

  block_return_value
end

# File lib/timeasure.rb, line 51
def class_interceptor_name_for(base_class)
  "#{base_class.timeasure_name}ClassInterceptor"
end

# File lib/timeasure.rb, line 47
def instance_interceptor_name_for(base_class)
  "#{base_class.timeasure_name}InstanceInterceptor"
end

# File lib/timeasure.rb, line 55
def interceptor_module_for(base_class)
  Module.new do
    @klass_name = base_class

    def self.klass_name
      @klass_name
    end
  end
end

# File lib/timeasure.rb, line 59
def self.klass_name
  @klass_name
end

# File lib/timeasure.rb, line 65
def timeasure_enabled?
  configuration.enable_timeasure_proc.call
end