#include <iostream>
#include <string>
#include <cerrno>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include "Log.hpp"

class Sock
{
private:
    const static int _backlog = 20;

public:
    Sock() {}
    ~Sock() {}
    // 1. 创建套接字
    int Socket()
    {
        int listen_sockfd = socket(AF_INET, SOCK_STREAM, 0);
        if (listen_sockfd < 0)
        {
            logMessage(FATAL, "%d:%s", errno, strerror(errno));
            exit(2);
        }
        logMessage(NORMAL, "%s: %d", "create socket success, sockfd", listen_sockfd);
        return listen_sockfd;
    }
    // 2. 绑定
    void Bind(int listen_sockfd, uint16_t port, std::string ip = "0.0.0.0")
    {
        // 2.1 填充属性
        struct sockaddr_in local;
        memset(&local, 0, sizeof(local));
        local.sin_family = AF_INET;   // 网络传输
        local.sin_port = htons(port); // 本地->网络
        local.sin_addr.s_addr = ip.empty() ? INADDR_ANY : inet_addr(ip.c_str());
        // 2.2 绑定
        if (bind(listen_sockfd, (struct sockaddr *)&local, sizeof(local)) < 0)
        {
            logMessage(FATAL, "bind():errno:%d:%s", errno, strerror(errno));
            exit(3);
        }
    }
    // 3. 监听
    void Listen(int listen_sockfd)
    {
        if (listen(listen_sockfd, _backlog) < 0)
        {
            logMessage(FATAL, "listen()errno:%d:%s", errno, strerror(errno));
            exit(4);
        }
        logMessage(NORMAL, "initialize tcp server...%s", strerror(errno));
    }
    // 4. 获取连接
    int Accept(int listen_sockfd, std::string *ip, uint16_t *port)
    {
        struct sockaddr_in client;
        socklen_t len = sizeof(client);
        int service_sockfd = accept(listen_sockfd, (struct sockaddr *)&client, &len);
        // 获取连接失败
        if (service_sockfd < 0)
        {
            logMessage(ERROR, "accept()errno:%d:%s", errno, strerror(errno));
            return -1;
        }
        if (port)
            *port = ntohs(client.sin_port);
        if (ip)
            *ip = inet_ntoa(client.sin_addr);

        return service_sockfd;
    }
    // 获取连接成功
    // 通信准备 (网络->主机)
    bool Connect(int service_sockfd, const std::string &server_ip, const uint16_t &server_port)
    {
        struct sockaddr_in server;
        memset(&server, 0, sizeof(server));
        server.sin_family = AF_INET;
        server.sin_port = htons(server_port);
        server.sin_addr.s_addr = inet_addr(server_ip.c_str());

        if (connect(service_sockfd, (struct sockaddr *)&server, sizeof(server)) == 0)
            return true;
        else
            return false;
    }
};