# typed: ignore
# frozen_string_literal: true

require 'active_support/json'
require 'active_support/core_ext/hash/indifferent_access'
require 'active_support/core_ext/string/access'

module Setsuzoku
  module Service
    module WebService
      module ApiStrategies
        # Defines all necessary methods for handling interfacing with a REST API.
        class RestStrategy < WebService::ApiStrategy
          extend T::Sig
          extend T::Helpers

          def request_class
            RestAPIRequest
          end

          def self.required_instance_methods
            []
          end

          # Make a REST API request.
          # 1. Format the request and send it via the appropriate HTTP method.
          # 2. Format the response and return it.
          #
          # @param request [RestAPIRequest] the constructed API request object.
          # @param action_details [Hash] the action details for the action to execute.
          # @param options [Any] additional options needed to pass to correctly perform the request.
          # options are:
          #   media_type - 'json'
          #   attachment_url_key - 'Symbol' the form field to post the attachment in the form.
          #   attachment_urls - 'Array<String>' List of attachment urls to be attached as form files.
          #
          # @return [Hash] the parsed response object.
          sig { override.params(request: RestAPIRequest, action_details: T::Hash[T.untyped, T.untyped], options: T.untyped).returns(Faraday::Response) }
          def perform_external_call(request:, action_details:, **options)
            request_properties = self.get_request_properties(action_name: request.action, action_details: action_details, req_params: request.body)
            request_options = self.request_options(request_properties[:request_format], action_details[:actions][request.action])
            authorization = request_options.delete(:authorization)
            full_request = self.formulate_request(request_properties, request_options)

            @faraday = Faraday.new(url: request_properties[:formatted_full_url], request: { params_encoder: Faraday::FlatParamsEncoder }) do |faraday|
              faraday.request(:multipart) if options[:attachment_urls].present?
              faraday.request(:url_encoded)
              #TODO: change these to faraday = self.auth_strategy.set_authorization!(request: faraday)
              unless request.without_headers
                if authorization
                  if authorization.key?(:token)
                    faraday.authorization(:Bearer, authorization[:token])
                  elsif authorization.key?(:basic_auth)
                    faraday.request(:basic_auth, authorization[:basic_auth][:username], authorization[:basic_auth][:password])
                  end
                end
              end
              faraday.adapter Faraday.default_adapter
            end
            attachment_urls = options[:attachment_url] || options[:attachment_urls]
            if attachment_urls.present?
              resp = @faraday.post do |req|
                payload = {}
                # create an array to just iterate over for 1 or many urls
                attachment_urls = [attachment_urls] if options[:attachment_url]
                attachments = attachment_urls.map do |url|
                  image = open(url, 'rb')
                  Faraday::UploadIO.new(image, T.must(image).content_type, File.basename(url))
                end
                if request_properties[:request_format] == :json
                  payload[:json] = Faraday::UploadIO.new(StringIO.new(full_request), 'application/json')
                else
                  payload.merge!(full_request)
                end
                # if using the singular "attachment_url" key pull out the first item
                payload[options[:attachment_url_key]] = options[:attachment_url] ? attachments.first : attachments
                req.body = payload
              end
            else
              if request.without_headers
                @faraday.headers = {}
              elsif request_options[:headers]
                @faraday.headers = (@faraday.headers || {}).merge(request_options[:headers])
              end
              resp = @faraday.send(request_properties[:request_method], request_properties[:formatted_full_url], full_request)
            end
            resp
          end

          sig do
            params(
                action_name: Symbol,
                for_stub: T::Boolean,
                req_params: T::Hash[T.untyped, T.untyped],
                action_details: T::Hash[Symbol, T.untyped]
            ).returns(T::Hash[Symbol, T.untyped])
          end
          def get_request_properties(action_name:, for_stub: false, req_params: {}, action_details: { actions: self.plugin.api_actions, url: self.plugin.api_base_url })
            action = action_details[:actions][action_name]
            url = action.has_key?(:request_url) ? action[:request_url] : action_details[:url]
            request_method, endpoint = action.first
            request_method = request_method.downcase.to_sym
            request_format = action[:request_type]
            response_format = action[:response_type]
            stub_data = action[:stub_data] if for_stub
            full_url = url + endpoint
            formatted_full_url, req_params = self.replace_dynamic_vars(full_url: full_url, req_params: req_params)
            {
                request_method: request_method,
                endpoint: endpoint,
                request_format: request_format,
                response_format: response_format,
                formatted_full_url: formatted_full_url,
                req_params: req_params,
                stub_data: stub_data,
            }
          end

          # Create the proper request body based on the request_properties and request_options passed
          #
          # @param request_properties [Hash] information pertaining to the body of the request
          # @param request_options [Hash] information pertainint to the headers of the request
          #
          # @return full_request [Hash/String] returns the request body in the format required
          def formulate_request(request_properties = {}, request_options = {})
            request_format = request_properties.dig(:request_format).to_s
            params = request_properties[:req_params].merge(request_options.except(:headers))
            if request_properties[:request_method] == :get
              # Faraday expects get requests params to be a hash
              params
            elsif request_properties[:req_params].empty?
              if %i[put patch post].include?(request_properties[:request_method])
                params.to_json # Faraday doesn't support an empty hash for PUT/PATCH/POST requests
              else
                params # Faraday supports empty hashes for other request types...
              end
            else
              # if the header or request format include urlencoded return the body as a hash
              if request_format.include?('urlencoded')
                params
              else
                # return either xml or json
                if request_properties[:request_format] == :xml
                  convert_hash_to_xml(params)
                else
                  params.to_json
                end
              end
            end
          end

          def request_options(request_format = nil, action_details = {})
            request_options = {}
            (request_options = {})[:headers] = {}
            request_options[:headers]
              .merge!(self.auth_strategy.get_from_context(:auth_headers).except(:authorization))
              .merge!(self.get_from_context(:api_headers))
              .merge!(action_details[:request_options] || {})
            request_options[:authorization] = action_details[:authorization] || self.auth_strategy.get_from_context(:auth_headers)[:authorization]

            content_type = case request_format
                           when :json
                             'application/json'
                           when :xml
                             'application/xml'
                           when :text, :file
                             'text/plain'
                           when :pdf
                             'application/pdf'
                           when :'x-www-form-urlencoded;charset=UTF-8'
                             'application/x-www-form-urlencoded;charset=UTF-8'
                           else
                             'application/json'
                           end
            (request_options[:headers] ||= {})[:'Content-Type'] = content_type
            request_options
          end

          def replace_dynamic_vars(full_url:, req_params: {})
            # replace matching vars in the action with matching params.
            # scans the string for variables like {{number_sid}} and replaces it with the matching key in params
            # removes the params variable, as it's probably intended to be in the url only. If you encounter a need to have
            # it in the body and the url, then you should put it in params twice with different names.
            req_params = req_params.dup
            full_url = full_url.dup
            dynamic_vars = self.plugin.dynamic_url_params.merge(req_params).with_indifferent_access
            full_url.scan(/({{.*?}})/).flatten.each do |var|
              var_name = var.tr('{{ }}', '')
              next unless dynamic_vars[var_name]

              full_url.gsub!(var, dynamic_vars[var_name])
              req_params.delete(var_name)
              req_params.delete(var_name.to_sym)
            end
            [full_url, req_params]
          end
        end
      end
    end
  end
end