require 'pact_broker/matrix/reason'

module PactBroker
  module Api
    module Decorators
      class ReasonDecorator
        def initialize(reason)
          @reason = reason
        end

        def to_s
          case reason
          when PactBroker::Matrix::PactNotEverVerifiedByProvider
            "There is no verified pact between #{reason.consumer_selector.description} and #{reason.provider_selector.description}"
          when PactBroker::Matrix::PactNotVerifiedByRequiredProviderVersion
            "There is no verified pact between #{reason.consumer_selector.description} and #{reason.provider_selector.description}"
          # when PactBroker::Matrix::VerificationFailed
          #   "The pact verification between #{reason.consumer_selector.description} and #{reason.provider_selector.description} failed"
          when PactBroker::Matrix::SpecifiedVersionDoesNotExist
            version_does_not_exist_description(reason.selector)
          when PactBroker::Matrix::VerificationFailed
            "The verification for the pact between #{reason.consumer_selector.description} and #{reason.provider_selector.description} failed"
          when PactBroker::Matrix::NoDependenciesMissing
            "There are no missing dependencies"
          when PactBroker::Matrix::Successful
            "All required verification results are published and successful"
          when PactBroker::Matrix::InteractionsMissingVerifications
            descriptions = reason.interactions.collect do | interaction |
              interaction_description(interaction)
            end.join('; ')
            "WARNING: Although the verification was reported as successful, the results for #{reason.consumer_selector.description} and #{reason.provider_selector.description} may be missing tests for the following interactions: #{descriptions}"
          else
            reason
          end
        end

        private

        attr_reader :reason

        def version_does_not_exist_description selector
          if selector.version_does_not_exist?
            if selector.tag
              "No version with tag #{selector.tag} exists for #{selector.pacticipant_name}"
            elsif selector.pacticipant_version_number
              "No pacts or verifications have been published for version #{selector.pacticipant_version_number} of #{selector.pacticipant_name}"
            else
              "No pacts or verifications have been published for #{selector.pacticipant_name}"
            end
          else
            ""
          end
        end

        # TODO move this somewhere else
        def interaction_description(interaction)
          if interaction['providerState'] && interaction['providerState'] != ''
            "#{interaction['description']} given #{interaction['providerState']}"
          elsif interaction['providerStates'] && interaction['providerStates'].is_a?(Array) && interaction['providerStates'].any?
            provider_states = interaction['providerStates'].collect{ |ps| ps['name'] }.compact.join(', ')
            "#{interaction['description']} given #{provider_states}"
          else
            interaction['description']
          end
        end
      end
    end
  end
end