// This file is originally from Trantor - TcpServer.h

// Copyright (c) 2016-2021, Tao An.  All rights reserved.

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//   * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//   * Neither the name of Tao An nor the names of other contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#pragma once

#include "core/log/logger.h"
#include "core/loops/callbacks.h"
#include "core/loops/event_loop_thread_pool.h"
#include "core/loops/timing_wheel.h"
#include "core/net/inet_address.h"
#include "core/net/tcp_connection.h"
#include <signal.h>
#include <memory>
#include <set>
#include <string>

class Acceptor;
class SSLContext;

//Inherit from Acceptor (-> Could be called ServerSocket)? 

class TcpServer {
protected:
	TcpServer(const TcpServer &) = delete;
	TcpServer &operator=(const TcpServer &) = delete;
	// some uncopyable classes maybe support move constructor....
	TcpServer(TcpServer &&) noexcept(true) = default;
	TcpServer &operator=(TcpServer &&) noexcept(true) = default;

public:
	TcpServer(EventLoop *loop, const InetAddress &address, const std::string &name, bool reUseAddr = true, bool reUsePort = true);
	~TcpServer();

	void start();
	void stop();

	void setIoLoopNum(size_t num) {
		assert(!started_);
		loopPoolPtr_ = std::make_shared<EventLoopThreadPool>(num);
		loopPoolPtr_->start();
	}

	void setIoLoopThreadPool(const std::shared_ptr<EventLoopThreadPool> &pool) {
		assert(pool->size() > 0);
		assert(!started_);
		loopPoolPtr_ = pool;
		loopPoolPtr_->start();
	}

	void setRecvMessageCallback(const RecvMessageCallback &cb) {
		recvMessageCallback_ = cb;
	}
	void setRecvMessageCallback(RecvMessageCallback &&cb) {
		recvMessageCallback_ = std::move(cb);
	}

	void setConnectionCallback(const ConnectionCallback &cb) {
		connectionCallback_ = cb;
	}
	void setConnectionCallback(ConnectionCallback &&cb) {
		connectionCallback_ = std::move(cb);
	}

	void setWriteCompleteCallback(const WriteCompleteCallback &cb) {
		writeCompleteCallback_ = cb;
	}
	void setWriteCompleteCallback(WriteCompleteCallback &&cb) {
		writeCompleteCallback_ = std::move(cb);
	}

	const std::string &name() const {
		return serverName_;
	}

	const std::string ipPort() const;
	const InetAddress &address() const;

	EventLoop *getLoop() const {
		return loop_;
	}

	std::vector<EventLoop *> getIoLoops() const {
		return loopPoolPtr_->getLoops();
	}

	void kickoffIdleConnections(size_t timeout) {
		loop_->runInLoop([this, timeout]() {
			assert(!started_);
			idleTimeout_ = timeout;
		});
	}

	// certPath The path of the certificate file.
	// keyPath The path of the private key file.
	// useOldTLS If true, the TLS 1.0 and 1.1 are supported by the server.
	// sslConfCmds The commands used to call the SSL_CONF_cmd function in OpenSSL.
	// Note: It's well known that TLS 1.0 and 1.1 are not considered secure in 2020. And it's a good practice to only use TLS 1.2 and above.
	void enableSSL(const std::string &certPath, const std::string &keyPath, bool useOldTLS = false, const std::vector<std::pair<std::string, std::string> > &sslConfCmds = {});

private:
	EventLoop *loop_;
	std::unique_ptr<Acceptor> acceptorPtr_;

	void newConnection(int fd, const InetAddress &peer);

	std::string serverName_;
	std::set<TcpConnectionPtr> connSet_;

	RecvMessageCallback recvMessageCallback_;
	ConnectionCallback connectionCallback_;
	WriteCompleteCallback writeCompleteCallback_;

	size_t idleTimeout_{ 0 };
	std::map<EventLoop *, std::shared_ptr<TimingWheel> > timingWheelMap_;
	void connectionClosed(const TcpConnectionPtr &connectionPtr);
	std::shared_ptr<EventLoopThreadPool> loopPoolPtr_;

#ifndef _WIN32
	class IgnoreSigPipe {
	public:
		IgnoreSigPipe() {
			::signal(SIGPIPE, SIG_IGN);
			LOG_TRACE << "Ignore SIGPIPE";
		}
	};

	IgnoreSigPipe initObj;
#endif

	bool started_{ false };

	// OpenSSL SSL context Object;
	std::shared_ptr<SSLContext> sslCtxPtr_;
};