#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "uv.h"

static uv_loop_t *uv_loop;
uv_udp_t handle;

static void on_alloc(uv_handle_t* client, size_t suggested_size, uv_buf_t* buf) {
    buf->base = (char*) malloc(suggested_size);
    buf->len = suggested_size;
}

static void on_send(uv_udp_send_t *req, int status) {
    if (status) {
        fprintf(stderr, "Send error %s\n", uv_strerror(status));
        return;
    }
}

static void on_recv(uv_udp_t* handle, ssize_t nread, const uv_buf_t* rcvbuf, const struct sockaddr* addr, unsigned flags) {
    if (nread > 0) {
        printf("Length:  %lu\n", nread);
        printf("Message: %s", rcvbuf->base);

        uv_udp_send_t req;
        uv_buf_t buf = uv_buf_init(rcvbuf->base, nread);

        uv_udp_send(&req, handle, &buf, 1, addr, on_send);
    }

    free(rcvbuf->base);
}

int main(int argc,char *argv[]) {
    struct sockaddr_in addr;
    uv_loop = uv_default_loop();

    uv_udp_init(uv_loop, &handle);
    uv_ip4_addr("0.0.0.0", 3000, &addr);
    uv_udp_bind(&handle, (const struct sockaddr*) &addr, 0);
    uv_udp_recv_start(&handle, on_alloc, on_recv);

    uv_run(uv_loop, UV_RUN_DEFAULT);

    return 0;
}