#include <boost/variant.hpp>
#include <jsonpp.h>
#include <slicer/slicer.h>
#include <json/serializer.h>
#include <boost/format.hpp>
#include <boost/lexical_cast.hpp>

namespace TMDb {
	class HttpClient {
		public:
			class ParameterValue {
				public:
					ParameterValue(const std::string & v) :
						value(v)
					{
					}

					template <typename V>
					ParameterValue(const V & v) :
						value(boost::lexical_cast<std::string>(v))
					{
					}

					template <typename V>
					ParameterValue(const IceUtil::Optional<V> & v) :
						value(v ? boost::lexical_cast<std::string>(*v) : IceUtil::Optional<std::string>())
					{
					}
				
					IceUtil::Optional<std::string> value;
			};
			typedef std::map<std::string, ParameterValue> Parameters;

		protected:
			HttpClient(const std::string & baseUrl, const std::string & apikey);

			template <typename ... Params>
			std::string
			GetUrl(const std::string & pathFormat, const Params & ... params, const Parameters & parameters) const
			{
				boost::format path(pathFormat);
				packParams(path, params...);
				std::string pathStr(path.str());
				appendQueryParameters(pathStr, parameters);
				return BaseURL + pathStr;
			}

			template <typename ReturnModel, typename ... Params>
			IceInternal::Handle<ReturnModel>
			GetData(const std::string & pathFormat, const Params & ... params, const Parameters & parameters) const
			{
				json::Value data = FetchJson(GetUrl<Params...>(pathFormat, params..., parameters));
				return Slicer::Deserialize<Slicer::JsonValueDeserializer, ReturnModel>(data);
			}

			static void packParams(boost::format &);

			template <typename T, typename ... Ts>
			static void packParams(boost::format & fmt, const T & param, const Ts & ... params)
			{
				fmt % param;
				packParams(fmt, params...);
			}

			void appendQueryParameters(std::string & path, const Parameters & parameters) const;
			void appendQueryParameters(std::string & path, const Parameters::value_type & nvp) const;
			json::Value FetchJson(const std::string & path) const;

			const std::string BaseURL;
			const std::string ApiKey;
	};
};