require_relative 'naming'
require_relative 'special_cases'

module IpaTestKit
  class Generator
    class ProvenanceRevincludeSearchTestGenerator
      class << self
        def generate(ig_metadata)
          ig_metadata.groups
            .reject { |group| SpecialCases.exclude_resource? group.resource }
            .select { |group| group.revincludes.include? 'Provenance:target' }
            .each { |group| new(group, group.searches.first).generate }
        end
      end

      attr_accessor :group_metadata, :search_metadata

      def initialize(group_metadata, search_metadata)
        self.group_metadata = group_metadata
        self.search_metadata = search_metadata
      end

      def template
        @template ||= File.read(File.join(__dir__, 'templates', 'provenance_revinclude_search.rb.erb'))
      end

      def output
        @output ||= ERB.new(template).result(binding)
      end

      def base_output_file_name
        "#{class_name.underscore}.rb"
      end

      def output_file_directory
        File.join(__dir__, '..', 'generated', profile_identifier)
      end

      def output_file_name
        File.join(output_file_directory, base_output_file_name)
      end

      def profile_identifier
        Naming.snake_case_for_profile(group_metadata)
      end

      def test_id
        "ipa_010_#{profile_identifier}_#{search_identifier}_search_test"
      end

      def search_identifier
        'provenance_revinclude'
      end

      def search_title
        search_identifier.camelize
      end

      def class_name
        "#{Naming.upper_camel_case_for_profile(group_metadata)}#{search_title}SearchTest"
      end

      def resource_type
        group_metadata.resource
      end

      def search_params
        @search_params ||=
          search_metadata[:names].map do |name|
            {
              name: name,
              path: search_definition(name)[:path]
            }
          end
      end

      def first_search?
        group_metadata.searches.first == search_metadata
      end

      def fixed_value_search?
        search_metadata[:names] != ['patient'] &&
          !group_metadata.delayed? && resource_type != 'Patient'
      end

      def fixed_value_search_param_name
        (search_metadata[:names] - [:patient]).first
      end

      def search_param_name_string
        search_metadata[:names].join(' + ') + ' + revInclude:Provenance:target'
      end

      def needs_patient_id?
        search_metadata[:names].include?('patient') ||
          (resource_type == 'Patient' && search_metadata[:names].include?('_id'))
      end

      def search_param_names
        search_params.map { |param| param[:name] }
      end

      def search_param_names_array
        array_of_strings(search_param_names)
      end

      def path_for_value(path)
        path == 'class' ? 'local_class' : path
      end

      def required_comparators_for_param(name)
        search_definition(name)[:comparators].select { |_comparator, expectation| expectation == 'SHALL' }
      end

      def required_comparators
        @required_comparators ||=
          search_param_names.each_with_object({}) do |name, comparators|
            required_comparators = required_comparators_for_param(name)
            comparators[name] = required_comparators if required_comparators.present?
          end
      end

      # def patient_id_param?(param)
      #   param[:name] == 'patient' ||
      #     (resource_type == 'Patient' && param[:name] == '_id')
      # end

      def search_definition(name)
        group_metadata.search_definitions[name.to_sym]
      end

      def saves_delayed_references?
        first_search? && group_metadata.delayed_references.present?
      end

      def possible_status_search?
        !search_metadata[:names].include?('status') && group_metadata.search_definitions.key?(:status)
      end

      def token_search_params
        @token_search_params ||=
          search_param_names.select do |name|
            ['Identifier', 'CodeableConcept', 'Coding'].include? group_metadata.search_definitions[name.to_sym][:type]
          end
      end

      def token_search_params_string
        array_of_strings(token_search_params)
      end

      def required_comparators_string
        array_of_strings(required_comparators.keys)
      end

      def array_of_strings(array)
        quoted_strings = array.map { |element| "'#{element}'" }
        "[#{quoted_strings.join(', ')}]"
      end

      def search_properties
        {}.tap do |properties|
          properties[:fixed_value_search] = 'true' if fixed_value_search?
          properties[:resource_type] = "'#{resource_type}'"
          properties[:search_param_names] = search_param_names_array
          properties[:possible_status_search] = 'true' if possible_status_search?
        end
      end

      def search_test_properties_string
        search_properties
          .map { |key, value| "#{' ' * 8}#{key}: #{value}" }
          .join(",\n")
      end

      def generate
        FileUtils.mkdir_p(output_file_directory)
        File.open(output_file_name, 'w') { |f| f.write(output) }

        group_metadata.add_test(
          id: test_id,
          file_name: base_output_file_name
        )
      end
    end
  end
end