require 'rake/tasklib'
require 'pact/provider/pact_spec_runner'
require 'pact/provider/verification_report'
require 'pact/tasks/task_helper'

=begin
	To create a rake pact:verify:<something> task

	Pact::VerificationTask.new(:head) do | pact |
	  pact.uri 'http://master.cd.vpc.realestate.com.au/browse/BIQ-MAS/latestSuccessful/artifact/JOB2/Pacts/mas-contract_transaction_service.json'
     pact.uri 'http://master.cd.vpc.realestate.com.au/browse/BIQ-IMAGINARY-CONSUMER/latestSuccessful/artifact/JOB2/Pacts/imaginary_consumer-contract_transaction_service.json'
	end

	The pact.uri may be a local file system path or a remote URL.

	To run a pact:verify:xxx task you need to define a pact_helper.rb, ideally in spec/service_consumers.
	It should contain your service_provider definition, and load any provider state definition files.
	It should also load all your app's dependencies (eg by calling out to spec_helper)

	Eg.

	require 'spec_helper'
	require 'provider_states_for_my_consumer'

	Pact.service_provider "My Provider" do
		app { TestApp.new }
	end

=end


module Pact
	class VerificationTask < ::Rake::TaskLib
	  attr_reader :pact_spec_config

	  include Pact::TaskHelper
	  def initialize(name)
	    @pact_spec_config = []
	    @name = name
	    yield self
	    rake_task
	  end

	  def uri(uri, options = {})
	    @pact_spec_config << {uri: uri, support_file: options[:support_file]}
	  end

	  private

	  attr_reader :name

	  def parse_pactfile config
	  	Pact::ConsumerContract.from_uri config[:uri]
	  end

	  def publish_report config, output, result, provider_ref, reports_dir
  	    consumer_contract = parse_pactfile config
	    	#TODO - when checking out a historical version, provider ref will be prod, however it will think it is head. Fix this!!!!
  	    report = Provider::VerificationReport.new(
  	    	:result => result,
  	    	:output => output,
  	    	:consumer => {:name => consumer_contract.consumer.name, :ref => name},
  	    	:provider => {:name => consumer_contract.provider.name, :ref => provider_ref}
  	    	)

  	    FileUtils.mkdir_p reports_dir
  	    File.open("#{reports_dir}/#{report.report_file_name}", "w") { |file| file << JSON.pretty_generate(report) }
	  end

	  def rake_task
	  	namespace :pact do
	  	  desc "Verify provider against the consumer pacts for #{name}"
	  	  task "verify:#{name}" do

	  	  	exit_statuses = pact_spec_config.collect do | config |
	  	  		#TODO: Change this to accept the ConsumerContract that is already parsed, so we don't make the same request twice
		  	  	pact_spec_runner = Provider::PactSpecRunner.new([config])
		  	    exit_status = pact_spec_runner.run
		  	    publish_report config, pact_spec_runner.output, exit_status == 0, 'head', Pact.configuration.reports_dir
		  	    exit_status
	  	  	end

	  	  	handle_verification_failure do
	  	  		exit_statuses.count{ | status | status != 0 }
	  	  	end
	  	  end
	  	end
	  end
	end
end