#pragma once

#include "log.hpp"

#include <iostream>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <cstdlib>
#include <unistd.h>

namespace ns_tcp
{
    const uint16_t g_port = 8080;
    const int backlog = 5;
    enum
    {
        SOCK_ERR = 2,
        BIND_ERR,
        LISTEN_ERR
    };
    class TcpServer
    {
    private:
        uint16_t _port;
        int _listen_sock;
        static TcpServer* svr;//单例模式
    private:
    TcpServer(uint16_t port = g_port):_port(port)
    {}
    TcpServer(const TcpServer& s)
    {}
    
    public:
    static TcpServer* getInstance(int port)
    {
        if(nullptr == svr)
        {
            static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;//静态初始化锁
            pthread_mutex_lock(&lock);//加锁
            if(nullptr == svr)
            {
                svr = new TcpServer(port);
            }
            pthread_mutex_unlock(&lock);//解锁
        }
        return svr;
    }

    void InitTcpServer()
    {
        Socket();
        Bind();
        Listen();
        LOG(INFO, "init tcp success");
    }

    void Socket()
    {
        _listen_sock = socket(AF_INET, SOCK_STREAM, 0);
        if(_listen_sock < 0)
        {
            LOG(FATAL, "socket error.");
            exit(SOCK_ERR);
        }
        //std::cout << "listen_sock create success" << std::endl;
        int opt = 1;
        setsockopt(_listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));//设置地址复用
        LOG(INFO, "socket success.");
    }

    void Bind()
    {
        struct sockaddr_in local;
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY;//云服务器不绑定公网ip
        if(bind(_listen_sock, (sockaddr*)&local, sizeof(local)) < 0)
        {
            LOG(FATAL, "bind error.");
            exit(BIND_ERR);
        }
        //std::cout << "bind success:" << _port << std::endl;
        LOG(INFO, "bind success.");
    }

    void Listen()
    {
        if(listen(_listen_sock, backlog) < 0)
        {
            LOG(FATAL, "listen error.");
            exit(LISTEN_ERR);
        }
        LOG(INFO, "listen success");
    }

    int Sock()
    {
        return _listen_sock;
    }

    ~TcpServer()
    {
        if(_listen_sock >= 0)
            close(_listen_sock);
    }
    };

    TcpServer* TcpServer::svr = nullptr;

}