# frozen_string_literal: true

module RSpec
  module Rails
    module Api
      module DSL
        # These methods will be available in examples (i.e.: 'for_code')
        module Example
          def visit(example, path_params: {}, payload: {}, headers: {}) # rubocop:disable Metrics/AbcSize
            raise 'Missing context. Call visit with for_code context.' unless example

            status_code = prepare_status_code example.class.description

            request_params = prepare_request_params example.class.module_parent.description,
                                                    path_params, payload, headers

            send(request_params[:action],
                 request_params[:url],
                 params:  request_params[:params].to_json,
                 headers: request_params[:headers])

            check_response(response, status_code)

            set_request_example example.class.metadata[:rrad], request_params, status_code, response.body
          end

          def defined(entity)
            current_resource = self.class.metadata[:rrad].current_resource
            raise '@current_resource is unset' unless current_resource

            entities = self.class.metadata[:rrad].resources[current_resource][:entities]

            out = entities[entity]
            raise "Unkown entity '#{entity}' in resource '#{current_resource}'" unless out

            out.expand_with(entities)
          end

          private

          def check_response(response, expected_code)
            expect(response.status).to eq expected_code
            expect(response.headers['Content-Type']).to eq 'application/json; charset=utf-8' if expected_code != 204
          end

          def set_request_example(rrad_metadata, request_params, status_code = nil, response = nil)
            rrad_metadata.add_request_example(url:         request_params[:example_url],
                                              action:      request_params[:action],
                                              status_code: status_code,
                                              response:    response,
                                              path_params: request_params[:path_params],
                                              params:      request_params[:params])
          end

          def prepare_request_params(description, request_params = {}, payload = {}, request_headers = {})
            example_params = description.split ' '

            {
              action:      example_params[0].downcase,
              url:         prepare_request_url(example_params[1], request_params),
              example_url: example_params[1],
              params:      payload,
              headers:     prepare_request_headers(request_headers),
            }
          end

          # Replace path params by values
          def prepare_request_url(url, request_params)
            url.gsub(/(?::(\w*))/) do |e|
              symbol = e.sub(':', '').to_sym
              if request_params.key?(symbol)
                request_params[symbol]
              elsif respond_to?(symbol)
                send(symbol)
              else
                puts "! Define #{symbol} (let(:#{symbol}){ value }) or pass it to 'visit'"
              end
            end
          end

          def prepare_request_headers(headers = {})
            {
              'Accept'       => 'application/json',
              'Content-Type' => 'application/json',
            }.merge headers
          end

          def prepare_status_code(description)
            code_match = /-> (\d+) - .*/.match description

            raise 'Please provide a numerical code for the "for_code" block' unless code_match

            code_match[1].to_i
          end
        end
      end
    end
  end
end