# encoding: utf-8
# This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.

if defined?(::Rails)

require File.expand_path(File.join(File.dirname(__FILE__),'..','..','..','test_helper'))
require 'new_relic/agent/instrumentation/action_view_subscriber'

class NewRelic::Agent::Instrumentation::ActionViewSubscriberTest < Minitest::Test
  def setup
    @subscriber = NewRelic::Agent::Instrumentation::ActionViewSubscriber.new
    @stats_engine = NewRelic::Agent.instance.stats_engine
  end

  def teardown
    NewRelic::Agent.instance.stats_engine.clear_stats
  end

  def test_records_metrics_for_simple_template
    params = { :identifier => '/root/app/views/model/index.html.erb' }
    freeze_time
    in_transaction do
      @subscriber.start('render_template.action_view', :id, params)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/index')
      advance_time 2.0
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => 'model/index')
      @subscriber.finish('render_template.action_view', :id, params)
    end
    expected = { :call_count => 1, :total_call_time => 2.0 }
    assert_metrics_recorded('View/model/index.html.erb/Rendering' => expected)
  end

  def test_records_metrics_for_simple_file
    params = { :identifier => '/root/something.txt' }
    freeze_time
    in_transaction do
      @subscriber.start('render_template.action_view', :id, params)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => nil)
      advance_time 2.0
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => nil)
      @subscriber.finish('render_template.action_view', :id, params)
    end
    expected = { :call_count => 1, :total_call_time => 2.0 }
    assert_metrics_recorded('View/file/Rendering' => expected)
  end

  def test_records_metrics_for_simple_inline
    params = { :identifier => 'inline template' }
    freeze_time
    in_transaction do
      @subscriber.start('render_template.action_view', :id, params)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => nil)
      advance_time 2.0
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => nil)
      @subscriber.finish('render_template.action_view', :id, params)
    end
    expected = { :call_count => 1, :total_call_time => 2.0 }
    assert_metrics_recorded('View/inline template/Rendering' => expected)
  end

  def test_records_metrics_for_simple_text
    params = { :identifier => 'text template' }
    freeze_time
    in_transaction do
      @subscriber.start('render_template.action_view', :id, params)
      advance_time 2.0
      @subscriber.finish('render_template.action_view', :id, params)
    end
    expected = { :call_count => 1, :total_call_time => 2.0 }
    assert_metrics_recorded('View/text template/Rendering' => expected)
  end

  def test_records_metrics_for_simple_partial
    params = { :identifier => '/root/app/views/model/_form.html.erb' }
    freeze_time
    in_transaction do
      @subscriber.start('render_partial.action_view', :id, params)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/_form')
      advance_time 2.0
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => 'model/_form')
      @subscriber.finish('render_partial.action_view', :id, params)
    end
    expected = { :call_count => 1, :total_call_time => 2.0 }
    assert_metrics_recorded('View/model/_form.html.erb/Partial' => expected)
  end

  def test_records_metrics_for_simple_collection
    params = { :identifier => '/root/app/views/model/_user.html.erb' }
    freeze_time
    in_transaction do
      @subscriber.start('render_collection.action_view', :id, params)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/_user')
      advance_time 2.0
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => 'model/_user')
      @subscriber.finish('render_collection.action_view', :id, params)
    end
    expected = { :call_count => 1, :total_call_time => 2.0 }
    assert_metrics_recorded('View/model/_user.html.erb/Partial' => expected)
  end

  def test_records_metrics_for_layout
    freeze_time
    in_transaction do
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'layouts/application')
      advance_time 2.0
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => 'layouts/application')
    end
    expected = { :call_count => 1, :total_call_time => 2.0 }
    assert_metrics_recorded('View/layouts/application/Rendering' => expected)
  end

  def test_records_scoped_metric
    params = { :identifier => '/root/app/views/model/index.html.erb' }

    in_transaction('test_txn') do
      @subscriber.start('render_template.action_view', :id, params)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/index')
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => 'model/index')
      @subscriber.finish('render_template.action_view', :id, params)
    end

    expected = { :call_count => 1 }
    assert_metrics_recorded(
      ['View/model/index.html.erb/Rendering', 'test_txn'] => expected
    )
  end

  def test_records_nothing_if_tracing_disabled
    params = { :identifier => '/root/app/views/model/_user.html.erb' }

    NewRelic::Agent.disable_all_tracing do
      @subscriber.start('render_collection.action_view', :id, params)
      @subscriber.finish('render_collection.action_view', :id, params)
    end

    assert_metrics_not_recorded('View/model/_user.html.erb/Partial')
  end

  def test_creates_txn_node_for_simple_render
    params = { :identifier => '/root/app/views/model/index.html.erb' }

    in_transaction do
      @subscriber.start('render_template.action_view', :id, params)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/index')
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => 'model/index')
      @subscriber.finish('render_template.action_view', :id, params)
    end

    last_node = nil
    sampler = NewRelic::Agent.instance.transaction_sampler
    sampler.last_sample.root_node.each_node{|s| last_node = s }
    NewRelic::Agent.shutdown

    assert_equal('View/model/index.html.erb/Rendering',
                 last_node.metric_name)
  end

  def test_creates_nested_partial_node_within_render_node
    in_transaction do
      @subscriber.start('render_template.action_view', :id,
                        :identifier => 'model/index.html.erb')
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/index')
      @subscriber.start('render_partial.action_view', :id,
                        :identifier => '/root/app/views/model/_list.html.erb')
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/_list')
      @subscriber.finish('!render_template.action_view', :id,
                         :virtual_path => 'model/_list')
      @subscriber.finish('render_partial.action_view', :id,
                         :identifier => '/root/app/views/model/_list.html.erb')
      @subscriber.finish('!render_template.action_view', :id,
                           :virtual_path => 'model/index')
      @subscriber.finish('render_template.action_view', :id,
                         :identifier => 'model/index.html.erb')
    end

    sampler = NewRelic::Agent.instance.transaction_sampler
    template_node = sampler.last_sample.root_node.called_nodes[0].called_nodes[0]
    partial_node = template_node.called_nodes[0]

    assert_equal('View/model/index.html.erb/Rendering',
                 template_node.metric_name)
    assert_equal('View/model/_list.html.erb/Partial',
                 partial_node.metric_name)
  end

  def test_creates_nodes_for_each_in_a_collection_event
    in_transaction do
      @subscriber.start('render_collection.action_view', :id,
                        :identifier => '/root/app/views/model/_list.html.erb',
                        :count => 3)
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/_list')
      @subscriber.finish('!render_template.action_view', :id,
                        :virtual_path => 'model/_list')
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/_list')
      @subscriber.finish('!render_template.action_view', :id,
                        :virtual_path => 'model/_list')
      @subscriber.start('!render_template.action_view', :id,
                        :virtual_path => 'model/_list')
      @subscriber.finish('!render_template.action_view', :id,
                        :virtual_path => 'model/_list')
      @subscriber.finish('render_collection.action_view', :id,
                         :identifier => '/root/app/views/model/_list.html.erb',
                         :count => 3)
    end

    sampler = NewRelic::Agent.instance.transaction_sampler
    partial_nodes = sampler.last_sample.root_node.called_nodes[0].called_nodes

    assert_equal 3, partial_nodes.size
    assert_equal('View/model/_list.html.erb/Partial',
                 partial_nodes[0].metric_name)
  end

  def test_metric_path_identifies_file_render_event
    render_event = NewRelic::Agent::Instrumentation::ActionViewSubscriber::RenderEvent.new('foo', 0, 0, 'bar', {} )
    assert_equal('file', render_event.metric_path('baz', nil) )
  end

  def test_metric_path_cannot_identify_empty_collection_render_event
    render_event = NewRelic::Agent::Instrumentation::ActionViewSubscriber::RenderEvent.new('foo', 0, 0, 'bar', {} )
    assert_equal('(unknown)', render_event.metric_path('render_collection.action_view', nil) )
  end

end if ::Rails::VERSION::MAJOR.to_i >= 4

else
  puts "Skipping tests in #{__FILE__} because Rails is unavailable"
end