#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <pthread.h>

#define PORT 8001
#define BUFFER_SIZE 1024
#define MAX_CLIENTS 10

// 处理函数示例
void handle_function() {
    printf("处理函数被调用！\n");
}

// 客户端处理线程
void *client_handler(void *arg) {
    int client_socket = *(int *)arg;
    char buffer[BUFFER_SIZE];
    int bytes_read;

    while ((bytes_read = recv(client_socket, buffer, sizeof(buffer), 0)) > 0) {
        buffer[bytes_read] = '\0';
        printf("接收到客户端消息: %s\n", buffer);

        // 判断是否执行处理函数
        if (strcmp(buffer, "execute") == 0) {
            handle_function();
            send(client_socket, "处理函数已执行\n", strlen("处理函数已执行\n"), 0);
        } else {
            send(client_socket, "收到消息\n", strlen("收到消息\n"), 0);
        }
    }

    close(client_socket);
    printf("客户端断开连接\n");
    return NULL;
}

int main() {
    int server_socket, client_socket;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_addr_len = sizeof(client_addr);
    pthread_t thread_pool[MAX_CLIENTS];
    int client_count = 0;

    // 创建服务器 socket
    server_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket == -1) {
        perror("服务器 socket 创建失败");
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);

    // 绑定服务器 socket
    if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("绑定失败");
        close(server_socket);
        exit(EXIT_FAILURE);
    }

    // 开始监听
    if (listen(server_socket, MAX_CLIENTS) == -1) {
        perror("监听失败");
        close(server_socket);
        exit(EXIT_FAILURE);
    }

    printf("服务器已启动，等待客户端连接...\n");

    while (1) {
        // 接受客户端连接
        client_socket = accept(server_socket, (struct sockaddr *)&client_addr, &client_addr_len);
        if (client_socket == -1) {
            perror("接受客户端连接失败");
            continue;
        }

        printf("客户端连接成功，地址: %s\n", inet_ntoa(client_addr.sin_addr));

        // 创建线程处理客户端
        if (pthread_create(&thread_pool[client_count++], NULL, client_handler, &client_socket) != 0) {
            perror("线程创建失败");
        }

        // 防止线程池溢出
        if (client_count >= MAX_CLIENTS) {
            client_count = 0;
        }
    }

    close(server_socket);
    return 0;
}