# Generated by API Builder - https://www.apibuilder.io
# Service version: 0.2.6
# User agent: apibuilder app.apibuilder.io/bombas/storeback-api/0.2.6/ruby_client

require 'cgi'
require 'net/http'
require 'net/https'
require 'uri'
require 'base64'

require 'date'
require 'rubygems'
require 'json'
require 'bigdecimal'

# storeback-api is a test repo to poof of concept of PDP resource serving.
module Bombas
  module Storeback
    module Api
      module V0

        class Client

          module Constants

            BASE_URL = 'https://bombas-storeback-api.global.ssl.fastly.net/v1' unless defined?(Constants::BASE_URL)
            NAMESPACE = 'bombas.storeback.api.v0' unless defined?(Constants::NAMESPACE)
            USER_AGENT = 'apibuilder app.apibuilder.io/bombas/storeback-api/0.2.6/ruby_client' unless defined?(Constants::USER_AGENT)
            VERSION = '0.2.6' unless defined?(Constants::VERSION)
            VERSION_MAJOR = 0 unless defined?(VERSION_MAJOR)

          end

          attr_reader :url

          def initialize(url, opts={})
            @url = HttpClient::Preconditions.assert_class('url', url, String)
            @base_url = URI(url)
            @authorization = HttpClient::Preconditions.assert_class_or_nil('authorization', opts.delete(:authorization), HttpClient::Authorization)
            @default_headers = HttpClient::Preconditions.assert_class('default_headers', opts.delete(:default_headers) || {}, Hash)
            @http_handler = opts.delete(:http_handler) || HttpClient::DefaultHttpHandler.new

            HttpClient::Preconditions.assert_empty_opts(opts)
            HttpClient::Preconditions.check_state(url.match(/http.+/i), "URL[%s] must start with http" % url)
          end

          # Creates an instance of the client using the base url specified in the API spec.
          def Client.at_base_url(opts={})
            Client.new(Constants::BASE_URL, opts)
          end

          def request(path=nil)
            HttpClient::Preconditions.assert_class_or_nil('path', path, String)
            request = HttpClient::Request.new(@http_handler, @base_url, path.to_s).with_header('User-Agent', Constants::USER_AGENT).with_header('X-Apidoc-Version', Constants::VERSION).with_header('X-Apidoc-Version-Major', Constants::VERSION_MAJOR)

            @default_headers.each do |key, value|
              request = request.with_header(key, value)
            end

            if @authorization
              request = request.with_auth(@authorization)
            end

            request
          end

          def products
            @products ||= ::Bombas::Storeback::Api::V0::Clients::Products.new(self)
          end
        end

        module Clients

          class Products

            def initialize(client)
              @client = HttpClient::Preconditions.assert_class('client', client, ::Bombas::Storeback::Api::V0::Client)
            end

            # Returns a product by ID or by handle.
            # The following API will return a product object sanitized of private
            # information from shopify. It should be thought of as a serializer or
            # alturnative interface to the public shopify information per a product.
            def get(product_id)
              HttpClient::Preconditions.assert_class('product_id', product_id, String)
              r = @client.request("/v1/products/#{CGI.escape(product_id)}").get
              ::Bombas::Storeback::Api::V0::Models::Product.new(r)
            end

          end

        end

        module Models

          class Product

            attr_reader :id, :title, :handle, :description, :description_html, :item_count, :product_type, :gender, :colors, :sizes, :images, :variants, :breadcrumbs, :details, :created_at, :updated_at

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @id = (x = opts.delete(:id); x.nil? ? nil : HttpClient::Preconditions.assert_class('id', x, Integer))
              @title = (x = opts.delete(:title); x.nil? ? nil : HttpClient::Preconditions.assert_class('title', x, String))
              @handle = (x = opts.delete(:handle); x.nil? ? nil : HttpClient::Preconditions.assert_class('handle', x, String))
              @description = (x = opts.delete(:description); x.nil? ? nil : HttpClient::Preconditions.assert_class('description', x, String))
              @description_html = (x = opts.delete(:description_html); x.nil? ? nil : HttpClient::Preconditions.assert_class('description_html', x, String))
              @item_count = (x = opts.delete(:item_count); x.nil? ? nil : HttpClient::Preconditions.assert_class('item_count', x, Integer))
              @product_type = (x = opts.delete(:product_type); x.nil? ? nil : HttpClient::Preconditions.assert_class('product_type', x, String))
              @gender = (x = opts.delete(:gender); x.nil? ? nil : HttpClient::Preconditions.assert_class('gender', x, String))
              @colors = (x = opts.delete(:colors); x.nil? ? nil : HttpClient::Preconditions.assert_class('colors', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::Color) ? x : ::Bombas::Storeback::Api::V0::Models::Color.new(x)) })
              @sizes = (x = opts.delete(:sizes); x.nil? ? nil : HttpClient::Preconditions.assert_class('sizes', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::Size) ? x : ::Bombas::Storeback::Api::V0::Models::Size.new(x)) })
              @images = (x = opts.delete(:images); x.nil? ? nil : HttpClient::Preconditions.assert_class('images', x, Array).map { |v| HttpClient::Preconditions.assert_class('images', HttpClient::Helper.to_object(v), Hash) })
              @variants = (x = opts.delete(:variants); x.nil? ? nil : HttpClient::Preconditions.assert_class('variants', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::Variant) ? x : ::Bombas::Storeback::Api::V0::Models::Variant.new(x)) })
              @breadcrumbs = (x = opts.delete(:breadcrumbs); x.nil? ? nil : HttpClient::Preconditions.assert_class('breadcrumbs', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::Breadcrumb) ? x : ::Bombas::Storeback::Api::V0::Models::Breadcrumb.new(x)) })
              @details = (x = opts.delete(:details); x.nil? ? nil : HttpClient::Preconditions.assert_class('details', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::Detail) ? x : ::Bombas::Storeback::Api::V0::Models::Detail.new(x)) })
              @created_at = (x = opts.delete(:created_at); x.nil? ? nil : HttpClient::Preconditions.assert_class('created_at', x, String))
              @updated_at = (x = opts.delete(:updated_at); x.nil? ? nil : HttpClient::Preconditions.assert_class('updated_at', x, String))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Product.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :id => id,
                :title => title,
                :handle => handle,
                :description => description,
                :description_html => description_html,
                :item_count => item_count,
                :product_type => product_type,
                :gender => gender,
                :colors => colors.nil? ? nil : colors.map { |o| o.to_hash },
                :sizes => sizes.nil? ? nil : sizes.map { |o| o.to_hash },
                :images => images.nil? ? nil : images,
                :variants => variants.nil? ? nil : variants.map { |o| o.to_hash },
                :breadcrumbs => breadcrumbs.nil? ? nil : breadcrumbs.map { |o| o.to_hash },
                :details => details.nil? ? nil : details.map { |o| o.to_hash },
                :created_at => created_at,
                :updated_at => updated_at
              }
            end

          end

          # A particular size options for a product
          class Size

            attr_reader :name, :values

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @name = (x = opts.delete(:name); x.nil? ? nil : HttpClient::Preconditions.assert_class('name', x, String))
              @values = (x = opts.delete(:values); x.nil? ? nil : HttpClient::Preconditions.assert_class('values', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::SizeValues) ? x : ::Bombas::Storeback::Api::V0::Models::SizeValues.new(x)) })
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Size.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :name => name,
                :values => values.nil? ? nil : values.map { |o| o.to_hash }
              }
            end

          end

          class SizeValues

            attr_reader :id, :name, :guidance

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @id = (x = opts.delete(:id); x.nil? ? nil : HttpClient::Preconditions.assert_class('id', x, String))
              @name = (x = opts.delete(:name); x.nil? ? nil : HttpClient::Preconditions.assert_class('name', x, String))
              @guidance = (x = opts.delete(:guidance); x.nil? ? nil : HttpClient::Preconditions.assert_class('guidance', x, String))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              SizeValues.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :id => id,
                :name => name,
                :guidance => guidance
              }
            end

          end

          class Color

            attr_reader :id, :position, :name, :fill

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @id = (x = opts.delete(:id); x.nil? ? nil : HttpClient::Preconditions.assert_class('id', x, String))
              @position = (x = opts.delete(:position); x.nil? ? nil : HttpClient::Preconditions.assert_class('position', x, Integer))
              @name = (x = opts.delete(:name); x.nil? ? nil : HttpClient::Preconditions.assert_class('name', x, String))
              @fill = (x = opts.delete(:fill); x.nil? ? nil : HttpClient::Preconditions.assert_class('fill', x, String))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Color.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :id => id,
                :position => position,
                :name => name,
                :fill => fill
              }
            end

          end

          class Variant

            attr_reader :id, :product_id, :sku, :title, :is_available, :price, :shipping, :created_at, :updated_at, :sizes

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @id = (x = opts.delete(:id); x.nil? ? nil : HttpClient::Preconditions.assert_class('id', x, Integer))
              @product_id = (x = opts.delete(:product_id); x.nil? ? nil : HttpClient::Preconditions.assert_class('product_id', x, Integer))
              @sku = (x = opts.delete(:sku); x.nil? ? nil : HttpClient::Preconditions.assert_class('sku', x, String))
              @title = (x = opts.delete(:title); x.nil? ? nil : HttpClient::Preconditions.assert_class('title', x, String))
              @is_available = (x = opts.delete(:is_available); x.nil? ? nil : HttpClient::Preconditions.assert_boolean('is_available', x))
              @price = (x = opts.delete(:price); x.nil? ? nil : (x = x; x.is_a?(::Bombas::Storeback::Api::V0::Models::Price) ? x : ::Bombas::Storeback::Api::V0::Models::Price.new(x)))
              @shipping = (x = opts.delete(:shipping); x.nil? ? nil : (x = x; x.is_a?(::Bombas::Storeback::Api::V0::Models::Shipping) ? x : ::Bombas::Storeback::Api::V0::Models::Shipping.new(x)))
              @created_at = (x = opts.delete(:created_at); x.nil? ? nil : HttpClient::Preconditions.assert_class('created_at', x, String))
              @updated_at = (x = opts.delete(:updated_at); x.nil? ? nil : HttpClient::Preconditions.assert_class('updated_at', x, String))
              @sizes = (x = opts.delete(:sizes); x.nil? ? nil : HttpClient::Preconditions.assert_class('sizes', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::Size) ? x : ::Bombas::Storeback::Api::V0::Models::Size.new(x)) })
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Variant.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :id => id,
                :product_id => product_id,
                :sku => sku,
                :title => title,
                :is_available => is_available,
                :price => price.nil? ? nil : price.to_hash,
                :shipping => shipping.nil? ? nil : shipping.to_hash,
                :created_at => created_at,
                :updated_at => updated_at,
                :sizes => sizes.nil? ? nil : sizes.map { |o| o.to_hash }
              }
            end

          end

          class Shipping

            attr_reader :requires_shipping, :grams, :weight, :weight_unit

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @requires_shipping = (x = opts.delete(:requires_shipping); x.nil? ? nil : HttpClient::Preconditions.assert_boolean('requires_shipping', x))
              @grams = (x = opts.delete(:grams); x.nil? ? nil : HttpClient::Preconditions.assert_class('grams', x, Integer))
              @weight = (x = opts.delete(:weight); x.nil? ? nil : HttpClient::Preconditions.assert_class('weight', x, Integer))
              @weight_unit = (x = opts.delete(:weight_unit); x.nil? ? nil : HttpClient::Preconditions.assert_class('weight_unit', x, String))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Shipping.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :requires_shipping => requires_shipping,
                :grams => grams,
                :weight => weight,
                :weight_unit => weight_unit
              }
            end

          end

          class Breadcrumb

            attr_reader :name, :link, :position

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @name = (x = opts.delete(:name); x.nil? ? nil : HttpClient::Preconditions.assert_class('name', x, String))
              @link = (x = opts.delete(:link); x.nil? ? nil : HttpClient::Preconditions.assert_class('link', x, String))
              @position = (x = opts.delete(:position); x.nil? ? nil : HttpClient::Preconditions.assert_class('position', x, Integer))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Breadcrumb.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :name => name,
                :link => link,
                :position => position
              }
            end

          end

          class Image

            attr_reader :id, :position, :alt, :src

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @id = (x = opts.delete(:id); x.nil? ? nil : HttpClient::Preconditions.assert_class('id', x, Integer))
              @position = (x = opts.delete(:position); x.nil? ? nil : HttpClient::Preconditions.assert_class('position', x, Integer))
              @alt = (x = opts.delete(:alt); x.nil? ? nil : HttpClient::Preconditions.assert_class('alt', x, String))
              @src = (x = opts.delete(:src); x.nil? ? nil : HttpClient::Preconditions.assert_class('src', x, String))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Image.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :id => id,
                :position => position,
                :alt => alt,
                :src => src
              }
            end

          end

          class Price

            attr_reader :msrp, :price, :isDiscounted, :percentOff

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @msrp = (x = opts.delete(:msrp); x.nil? ? nil : HttpClient::Preconditions.assert_class('msrp', x, String))
              @price = (x = opts.delete(:price); x.nil? ? nil : HttpClient::Preconditions.assert_class('price', x, String))
              @isDiscounted = (x = opts.delete(:isDiscounted); x.nil? ? nil : HttpClient::Preconditions.assert_boolean('isDiscounted', x))
              @percentOff = (x = opts.delete(:percentOff); x.nil? ? nil : HttpClient::Preconditions.assert_class('percentOff', x, String))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Price.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :msrp => msrp,
                :price => price,
                :isDiscounted => isDiscounted,
                :percentOff => percentOff
              }
            end

          end

          class Detail

            attr_reader :icon_handle, :title, :tech

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @icon_handle = (x = opts.delete(:icon_handle); x.nil? ? nil : HttpClient::Preconditions.assert_class('icon_handle', x, String))
              @title = (x = opts.delete(:title); x.nil? ? nil : HttpClient::Preconditions.assert_class('title', x, String))
              @tech = (x = opts.delete(:tech); x.nil? ? nil : HttpClient::Preconditions.assert_class('tech', x, Array).map { |v| (x = v; x.is_a?(::Bombas::Storeback::Api::V0::Models::Tech) ? x : ::Bombas::Storeback::Api::V0::Models::Tech.new(x)) })
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Detail.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :icon_handle => icon_handle,
                :title => title,
                :tech => tech.nil? ? nil : tech.map { |o| o.to_hash }
              }
            end

          end

          class Tech

            attr_reader :title, :handle, :content

            def initialize(incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @title = (x = opts.delete(:title); x.nil? ? nil : HttpClient::Preconditions.assert_class('title', x, String))
              @handle = (x = opts.delete(:handle); x.nil? ? nil : HttpClient::Preconditions.assert_class('handle', x, String))
              @content = (x = opts.delete(:content); x.nil? ? nil : HttpClient::Preconditions.assert_class('content', x, String))
            end

            def to_json
              JSON.dump(to_hash)
            end

            def copy(incoming={})
              Tech.new(to_hash.merge(HttpClient::Helper.symbolize_keys(incoming)))
            end

            def to_hash
              {
                :title => title,
                :handle => handle,
                :content => content
              }
            end

          end

        end

        # ===== END OF SERVICE DEFINITION =====
        module HttpClient

          class HttpHandler

            # Returns a client instance to use
            #
            # @param base_uri The base URI for this API
            # @param path the Requested full http path (including any query strings)
            def instance(base_uri, path)
              raise "Override in subclass"
            end

          end

          class HttpHandlerInstance

            # Executes a request. The provided request object will be an
            # instance of Net::HTTP (e.g. Net::HTTP::Get)
            def execute(request)
              raise "Override in subclass"
            end

          end

          class DefaultHttpHandler < HttpHandler

            def instance(base_uri, path)
              DefaultHttpHandlerInstance.new(base_uri)
            end

          end

          class DefaultHttpHandlerInstance < HttpHandlerInstance

            attr_reader :client

            def initialize(base_uri)
              @base_uri = Preconditions.assert_class('base_uri', base_uri, URI)
              @client = Net::HTTP.new(@base_uri.host, @base_uri.port)
              if @base_uri.scheme == "https"
                configure_ssl
              end
            end

            def execute(request)
              response = begin
                           @client.request(request)
                         rescue SocketError => e
                           raise StandardError.new("Error accessing uri[#{full_uri(request.path)}]: #{e}")
                         end

              case response
              when Net::HTTPSuccess
                response.body
              else
                body = response.body rescue nil
                raise HttpClient::ServerError.new(response.code.to_i, response.message, :body => body, :uri => full_uri(request.path).to_s)
              end
            end

            def full_uri(path)
              path.start_with?(@base_uri.to_s) ? path : File.join(@base_uri.to_s, path)
            end

            # Called to configure SSL if the base uri requires it
            def configure_ssl
              @client.use_ssl = true
              @client.verify_mode = OpenSSL::SSL::VERIFY_PEER
              @client.cert_store = OpenSSL::X509::Store.new
              @client.cert_store.set_default_paths
            end

          end

          class Request

            attr_reader :base_uri, :path, :full_uri

            def initialize(http_handler, base_uri, path)
              @http_handler = http_handler
              @base_uri = Preconditions.assert_class('base_uri', base_uri, URI)
              @path = Preconditions.assert_class('path', path, String)
              @full_uri = @base_uri.to_s + @path
              @params = nil
              @body = nil
              @auth = nil
              @headers = {}
              @header_keys_lower_case = []
            end

            def with_header(name, value)
              Preconditions.check_not_blank('name', name, "Header name is required")
              Preconditions.check_not_blank('value', value, "Header value is required")
              Preconditions.check_state(!@headers.has_key?(name),
                                        "Duplicate header named[%s]" % name)
              @headers[name] = value
              @header_keys_lower_case << name.downcase
              self
            end

            def with_auth(auth)
              Preconditions.assert_class('auth', auth, HttpClient::Authorization)
              Preconditions.check_state(@auth.nil?, "auth previously set")

              if auth.scheme.name == AuthScheme::BASIC.name
                @auth = auth
              else
                raise "Auth Scheme[#{auth.scheme.name}] not supported"
              end
              self
            end

            def with_query(params)
              Preconditions.assert_class('params', params, Hash)
              Preconditions.check_state(@params.nil?, "Already have query parameters")
              @params = params
              self
            end

            # Wrapper to set Content-Type header to application/json and set
            # the provided json document as the body
            def with_json(json)
              @headers['Content-Type'] ||= 'application/json; charset=UTF-8'
              with_body(json)
            end

            def with_body(body)
              Preconditions.check_not_blank('body', body)
              @body = body
              self
            end

            def get(&block)
              do_request(Net::HTTP::Get, &block)
            end

            def delete(&block)
              do_request(Net::HTTP::Delete, &block)
            end

            def options(&block)
              do_request(Net::HTTP::Options, &block)
            end

            def post(&block)
              do_request(Net::HTTP::Post, &block)
            end

            def put(&block)
              do_request(Net::HTTP::Put, &block)
            end

            class PATCH < Net::HTTP::Put
              METHOD = "PATCH"
            end

            def patch(&block)
              do_request(PATCH, &block)
            end

            def do_request(klass)
              Preconditions.assert_class('klass', klass, Class)

              uri = @full_uri.dup
              if q = to_query(@params)
                uri += "?%s" % q
              end

              request = klass.send(:new, uri)

              # DEBUG curl = ['curl']
              # DEBUG if klass != Net::HTTP::Get
              # DEBUG  curl << "-X%s" % klass.name.split("::").last.upcase
              # DEBUG end

              if @body
                # DEBUG tmpfile = "/tmp/rest_client.tmp"
                # DEBUG File.open(tmpfile, "w") { |os| os << @body.to_s }
                # DEBUG curl << "-d@%s" % tmpfile
                request.body = @body
              end

              if @auth
                # DEBUG curl << "-u \"%s:%s\"" % [@auth.username, @auth.password]
                Preconditions.check_state(!@header_keys_lower_case.include?("authorization"),
                                          "Cannot specify both an Authorization header and an auth instance")
                user_pass = "%s:%s" % [@auth.username, @auth.password]
                encoded = Base64.encode64(user_pass).to_s.split("\n").map(&:strip).join
                request.add_field("Authorization", "Basic %s" % encoded)
              end

              @headers.each { |key, value|
                # DEBUG curl <<  "-H \"%s: %s\"" % [key, value]
                request.add_field(key, value)
              }

              # DEBUG curl << "'%s%s'" % [@base_uri, path]
              # DEBUG puts curl.join(" ")

              raw_response = @http_handler.instance(@base_uri, request.path).execute(request)
              response = raw_response.to_s == "" ? nil : JSON.parse(raw_response)

              if block_given?
                yield response
              else
                response
              end
            end

            private
            def to_query(params={})
              parts = (params || {}).map { |k,v|
                if v.is_a?(Enumerable)
                  v.map { |el| "%s=%s" % [k, CGI.escape(el.to_s)] }
                else
                  "%s=%s" % [k, CGI.escape(v.to_s)]
                end
              }
              parts.empty? ? nil : parts.join("&")
            end

          end

          class ServerError < StandardError

            attr_reader :code, :details, :body, :uri

            def initialize(code, details, incoming={})
              opts = HttpClient::Helper.symbolize_keys(incoming)
              @code = HttpClient::Preconditions.assert_class('code', code, Integer)
              @details = HttpClient::Preconditions.assert_class('details', details, String)
              @body = HttpClient::Preconditions.assert_class_or_nil('body', opts.delete(:body), String)
              @uri = HttpClient::Preconditions.assert_class_or_nil('uri', opts.delete(:uri), String)
              HttpClient::Preconditions.assert_empty_opts(opts)
              super(self.message)
            end

            def message
              m = "%s %s" % [@code, @details]
              if @body
                m << ": %s" % @body
              end
              m
            end

            def body_json
              @body ? JSON.parse(@body) : nil
            end

          end

          class PreconditionException < StandardError

            attr_reader :message

            def initialize(message)
              super(message)
              @message = message
            end

          end

          module Preconditions

            def Preconditions.check_argument(expression, error_message=nil)
              if !expression
                raise PreconditionException.new(error_message || "check_argument failed")
              end
              nil
            end

            def Preconditions.check_state(expression, error_message=nil)
              if !expression
                raise PreconditionException.new(error_message || "check_state failed")
              end
              nil
            end

            def Preconditions.check_not_nil(field_name, reference, error_message=nil)
              if reference.nil?
                raise PreconditionException.new(error_message || "argument for %s cannot be nil" % field_name)
              end
              reference
            end

            def Preconditions.check_not_blank(field_name, reference, error_message=nil)
              if reference.to_s.strip == ""
                raise PreconditionException.new(error_message || "argument for %s cannot be blank" % field_name)
              end
              reference
            end

            # Throws an error if opts is not empty. Useful when parsing
            # arguments to a function
            def Preconditions.assert_empty_opts(opts)
              if !opts.empty?
                raise PreconditionException.new("Invalid opts: #{opts.keys.inspect}\n#{opts.inspect}")
              end
            end

            # Requires that the provided hash has the specified keys.
            # @param fields A list of symbols
            def Preconditions.require_keys(hash, fields, error_prefix=nil)
              missing = fields.select { |f| !hash.has_key?(f) }
              if !missing.empty?
                msg = "Missing required fields: " + missing.join(", ")
                raise PreconditionException.new(error_prefix.empty? ? msg : "#{error_prefix}: #{msg}")
              end
            end

            # Asserts that value is not nill and is_?(klass). Returns
            # value. Common use is
            #
            # amount = Preconditions.assert_class('amount', amount, BigDecimal)
            def Preconditions.assert_class(field_name, value, klass)
              Preconditions.check_not_nil('field_name', field_name)
              Preconditions.check_not_nil('klass', klass)
              Preconditions.check_not_nil('value', value, "Value for %s cannot be nil. Expected an instance of class %s" % [field_name, klass.name])
              Preconditions.check_state(value.is_a?(klass),
                                        "Value for #{field_name} is of type[#{value.class}] - class[#{klass}] is required. value[#{value.inspect.to_s}]")
              value
            end

            def Preconditions.assert_class_or_nil(field_name, value, klass)
              if !value.nil?
                Preconditions.assert_class(field_name, value, klass)
              end
            end

            def Preconditions.assert_boolean(field_name, value)
              Preconditions.check_not_nil('field_name', field_name)
              Preconditions.check_not_nil('value', value, "Value for %s cannot be nil. Expected an instance of TrueClass or FalseClass" % field_name)
              Preconditions.check_state(value.is_a?(TrueClass) || value.is_a?(FalseClass),
                                        "Value for #{field_name} is of type[#{value.class}] - class[TrueClass or FalseClass] is required. value[#{value.inspect.to_s}]")
              value
            end

            def Preconditions.assert_boolean_or_nil(field_name, value)
              if !value.nil?
                Preconditions.assert_boolean(field_name, value)
              end
            end

            def Preconditions.assert_collection_of_class(field_name, values, klass)
              Preconditions.assert_class(field_name, values, Array)
              values.each { |v| Preconditions.assert_class(field_name, v, klass) }
            end

            def Preconditions.assert_hash_of_class(field_name, hash, klass)
              Preconditions.assert_class(field_name, hash, Hash)
              values.each { |k, v| Preconditions.assert_class(field_name, v, klass) }
            end

          end

          class AuthScheme

            attr_reader :name

            def initialize(name)
              @name = HttpClient::Preconditions.check_not_blank('name', name)
            end

            BASIC = AuthScheme.new("basic") unless defined?(BASIC)

          end

          class Authorization

            attr_reader :scheme, :username, :password

            def initialize(scheme, username, opts={})
              @scheme = HttpClient::Preconditions.assert_class('schema', scheme, AuthScheme)
              @username = HttpClient::Preconditions.check_not_blank('username', username, "username is required")
              @password = HttpClient::Preconditions.assert_class_or_nil('password', opts.delete(:password), String)
              HttpClient::Preconditions.assert_empty_opts(opts)
            end

            def Authorization.basic(username, password=nil)
              Authorization.new(AuthScheme::BASIC, username, :password => password)
            end

          end

          module Helper

            def Helper.symbolize_keys(hash)
              Preconditions.assert_class('hash', hash, Hash)
              new_hash = {}
              hash.each { |k, v|
                new_hash[k.to_sym] = v
              }
              new_hash
            end

            def Helper.to_big_decimal(value)
              value ? BigDecimal(value.to_s) : nil
            end

            def Helper.to_object(value)
              value ? (value.is_a?(Hash) ? value : JSON.parse(value)) : nil
            end

            def Helper.to_uuid(value)
              Preconditions.check_state(value.nil? || value.match(/^\w\w\w\w\w\w\w\w\-\w\w\w\w\-\w\w\w\w\-\w\w\w\w\-\w\w\w\w\w\w\w\w\w\w\w\w$/),
                                        "Invalid guid[%s]" % value)
              value
            end

            def Helper.to_date_iso8601(value)
              if value.is_a?(Date)
                value
              elsif value
                Date.parse(value.to_s)
              else
                nil
              end
            end

            def Helper.to_date_time_iso8601(value)
              if value.is_a?(DateTime)
                value
              elsif value
                DateTime.parse(value.to_s)
              else
                nil
              end
            end

            def Helper.date_iso8601_to_string(value)
              value.nil? ? nil : value.strftime('%Y-%m-%d')
            end

            def Helper.date_time_iso8601_to_string(value)
              value.nil? ? nil : value.strftime('%Y-%m-%dT%H:%M:%S%z')
            end

            TRUE_STRINGS = ['t', 'true', 'y', 'yes', 'on', '1', 'trueclass'] unless defined?(TRUE_STRINGS)
            FALSE_STRINGS = ['f', 'false', 'n', 'no', 'off', '0', 'falseclass'] unless defined?(FALSE_STRINGS)

            def Helper.to_boolean(field_name, value)
              string = value.to_s.strip.downcase
              if TRUE_STRINGS.include?(string)
                true
              elsif FALSE_STRINGS.include?(string)
                false
              elsif string != ""
                raise PreconditionException.new("Unsupported boolean value[#{string}]. For true, must be one of: #{TRUE_STRINGS.inspect}. For false, must be one of: #{FALSE_STRINGS.inspect}")
              else
                nil
              end
            end

          end

        end
      end
    end
  end
end