#pragma once

#include <mutex>
#include <memory>
#include <chrono>
#include "LicenseManager.h"

namespace license {
	namespace stats {
		struct GeneralStatistics {
			std::chrono::system_clock::time_point age;

			uint64_t instances = 0;
			uint64_t servers = 0;
			uint64_t clients = 0;
			uint64_t bots = 0;
		};

		struct HistoryStatistics {
		    enum HistoryPeriod {
		        DAY,
		        WEEK,
		        MONTH,
		        HALF_YEAR,
		        YEAR
		    };
		    enum HistoryOffset {
		        NOW,
		        ONE_BEFORE,
		        SEVEN_BEFORE,
		        TWELVE_BEFORE
		    };
			enum HistoryType {
				LAST_DAY,
				DAY_YESTERDAY,
				DAY_7DAYS_AGO,
				LAST_WEEK,
				LAST_MONTH,
				LAST_HALF_YEAR
			};
			static std::chrono::system_clock::time_point align_type(HistoryType type, const std::chrono::system_clock::time_point&);
			static std::chrono::milliseconds time_period(HistoryType type);
			static std::chrono::milliseconds cache_timeout(HistoryType type);
			static std::chrono::milliseconds type_duration(HistoryType type);

			std::chrono::system_clock::time_point evaluated;
			std::chrono::system_clock::time_point begin;
			std::chrono::system_clock::time_point end;
			std::chrono::milliseconds period;
			HistoryType type;

			std::shared_ptr<server::LicenseManager::UserHistory> statistics;
		};

		class StatisticManager {
			public:
				explicit StatisticManager(const std::shared_ptr<server::LicenseManager>& /* manager */);
				virtual ~StatisticManager();

				void reset_cache_general();
				std::shared_ptr<GeneralStatistics> general_statistics();
				std::shared_ptr<HistoryStatistics> history(HistoryStatistics::HistoryType);
			private:
				std::shared_ptr<server::LicenseManager> license_manager;

				std::recursive_mutex _general_statistics_lock;
				std::recursive_mutex _general_statistics_generate_lock;
				std::shared_ptr<GeneralStatistics> _general_statistics;

				std::map<HistoryStatistics::HistoryType, std::recursive_mutex> _history_locks;
				std::map<HistoryStatistics::HistoryType, std::shared_ptr<HistoryStatistics>> _history;
		};
	}
}