//! \file picloudserver.h
//! \ingroup Cloud
//! \brief
//! \~english PICloud Server
//! \~russian Сервер PICloud
//! \details
//! \~english Server implementation for accepting PICloud client connections over TCP.
//! \~russian Реализация сервера для приема подключений клиентов PICloud по TCP.
/*
    PIP - Platform Independent Primitives
    PICloud Server
    Ivan Pelipenko peri4ko@yandex.ru, Andrey Bychkov work.a.b@yandex.ru

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef PICLOUDSERVER_H
#define PICLOUDSERVER_H

#include "picloudbase.h"
#include "piconditionvar.h"


//! \brief PICloud server implementation
//! \~english PICloud server for accepting client connections
//! \~russian Сервер PICloud для приема подключений клиентов
class PIP_CLOUD_EXPORT PICloudServer
	: public PIIODevice
	, public PICloudBase {
	PIIODEVICE(PICloudServer, "");

public:
	//! \brief
	//! \~english Constructs PICloudServer
	//! \~russian Создает PICloudServer
	explicit PICloudServer(const PIString & path = PIString(), PIIODevice::DeviceMode mode = PIIODevice::ReadWrite);

	//! \brief
	//! \~english Destructor
	//! \~russian Деструктор
	virtual ~PICloudServer();

	//! \brief Connected client representation
	//! \~english Represents a client connected to the server
	//! \~russian Представляет клиента, подключенного к серверу
	class Client: public PIIODevice {
		PIIODEVICE(PICloudServer::Client, "");
		friend class PICloudServer;

	public:
		//! \brief
		//! \~english Constructs Client
		//! \~russian Создает Client
		//! \param srv Parent server / Родительский сервер
		//! \param id Client ID / ID клиента
		Client(PICloudServer * srv = nullptr, uint id = 0);

		//! \brief
		//! \~english Destructor
		//! \~russian Деструктор
		virtual ~Client();

	protected:
		//! \brief
		//! \~english Opens device
		//! \~russian Открывает устройство
		bool openDevice() override;

		//! \brief
		//! \~english Closes device
		//! \~russian Закрывает устройство
		bool closeDevice() override;

		//! \brief
		//! \~english Reads data from device
		//! \~russian Читает данные из устройства
		ssize_t readDevice(void * read_to, ssize_t max_size) override;

		//! \brief
		//! \~english Writes data to device
		//! \~russian Записывает данные в устройство
		ssize_t writeDevice(const void * data, ssize_t size) override;

		//! \brief
		//! \~english Returns device info flags
		//! \~russian Возвращает флаги информации об устройстве
		DeviceInfoFlags deviceInfoFlags() const override { return PIIODevice::Reliable; }

		//! \brief
		//! \~english Returns number of bytes available
		//! \~russian Возвращает количество доступных байт
		ssize_t bytesAvailable() const override { return buff.size(); }

		//! \brief
		//! \~english Interrupts connection
		//! \~russian Прерывает соединение
		void interrupt() override;

	private:
		void pushBuffer(const PIByteArray & ba);
		PICloudServer * server;
		uint client_id;
		PIByteArray buff;
		PIMutex mutex_buff;
		PIConditionVariable cond_buff;
		std::atomic_bool is_connected;
	};

	//! \brief
	//! \~english Sets server name
	//! \~russian Устанавливает имя сервера
	void setServerName(const PIString & server_name);

	//! \brief
	//! \~english Returns list of connected clients
	//! \~russian Возвращает список подключенных клиентов
	PIVector<PICloudServer::Client *> clients() const;

	//! \brief
	//! \~english Raised when new client connects
	//! \~russian Вызывается при подключении нового клиента
	EVENT1(newConnection, PICloudServer::Client *, client);

protected:
	//! \brief
	//! \~english Opens device
	//! \~russian Открывает устройство
	bool openDevice() override;

	//! \brief
	//! \~english Closes device
	//! \~russian Закрывает устройство
	bool closeDevice() override;

	//! \brief
	//! \~english Reads data from device
	//! \~russian Читает данные из устройства
	ssize_t readDevice(void * read_to, ssize_t max_size) override;

	//! \brief
	//! \~english Writes data to device
	//! \~russian Записывает данные в устройство
	ssize_t writeDevice(const void * data, ssize_t max_size) override;

	//! \brief
	//! \~english Interrupts connection
	//! \~russian Прерывает соединение
	void interrupt() override;

private:
	EVENT_HANDLER1(void, _readed, PIByteArray &, ba);
	EVENT_HANDLER1(void, clientDeleted, PIObject *, o);
	void clientDisconnect(uint client_id);
	int sendData(const PIByteArray & data, uint client_id);

	PIVector<Client *> clients_;
	PIVector<Client *> removed_clients_;
	PIMap<uint, Client *> index_clients;
	PIThread ping_timer;
	PIConditionVariable cvar;
	PIMutex open_mutex;
	mutable PIMutex clients_mutex;
	std::atomic_bool is_deleted;
};

#endif // PICLOUDSERVER_H