#include <inttypes.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <uv.h>

uv_loop_t *loop;

struct child_worker {

    uv_process_t req;

    uv_process_options_t options;

    uv_pipe_t pipe;

} *workers;

int round_robin_counter;

int child_worker_count;

uv_buf_t dummy_buf;

char worker_path[500];

void close_process_handle(uv_process_t *req, int64_t exit_status, int term_signal) {

    fprintf(stderr, "Process exited with status %" PRId64 ", signal %d\n", exit_status, term_signal);

    uv_close((uv_handle_t*) req, NULL);

}

void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {

  buf->base = malloc(suggested_size);

  buf->len = suggested_size;

}

void on_new_connection(uv_stream_t *server, int status) {

    if (status == -1) {

        // error!

        return;

    }

    uv_tcp_t *client = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));

    uv_tcp_init(loop, client);

    if (uv_accept(server, (uv_stream_t*) client) == 0) {

        uv_write_t *write_req = (uv_write_t*) malloc(sizeof(uv_write_t));

        dummy_buf = uv_buf_init("a", 1);

        struct child_worker *worker = &workers[round_robin_counter];

        uv_write2(write_req, (uv_stream_t*) &worker->pipe, &dummy_buf, 1, (uv_stream_t*) client, NULL);

        round_robin_counter = (round_robin_counter + 1) % child_worker_count;

    }

    else {

        uv_close((uv_handle_t*) client, NULL);

    }

}

void setup_workers() {

    size_t path_size = 500;

    uv_exepath(worker_path, &path_size);

    strcpy(worker_path + (strlen(worker_path) - strlen("multi-echo-server")), "worker");

    fprintf(stderr, "Worker path: %s\n", worker_path);

    char* args[2];

    args[0] = worker_path;

    args[1] = NULL;

    round_robin_counter = 0;

    // ...

    // launch same number of workers as number of CPUs

    uv_cpu_info_t *info;

    int cpu_count;

    uv_cpu_info(&info, &cpu_count);

    uv_free_cpu_info(info, cpu_count);

    child_worker_count = cpu_count;

    workers = calloc(cpu_count, sizeof(struct child_worker));

    while (cpu_count--) {

        struct child_worker *worker = &workers[cpu_count];

        uv_pipe_init(loop, &worker->pipe, 1);

        uv_stdio_container_t child_stdio[3];

        child_stdio[0].flags = UV_CREATE_PIPE | UV_READABLE_PIPE;

        child_stdio[0].data.stream = (uv_stream_t*) &worker->pipe;

        child_stdio[1].flags = UV_IGNORE;

        child_stdio[2].flags = UV_INHERIT_FD;

        child_stdio[2].data.fd = 2;

        worker->options.stdio = child_stdio;

        worker->options.stdio_count = 3;

        worker->options.exit_cb = close_process_handle;

        worker->options.file = args[0];

        worker->options.args = args;

        uv_spawn(loop, &worker->req, &worker->options); 

        fprintf(stderr, "Started worker %d\n", worker->req.pid);

    }

}

int main() {

    loop = uv_default_loop();

    setup_workers();

    uv_tcp_t server;

    uv_tcp_init(loop, &server);

    struct sockaddr_in bind_addr;

    uv_ip4_addr("0.0.0.0", 7000, &bind_addr);

    uv_tcp_bind(&server, (const struct sockaddr *)&bind_addr, 0);

    int r;

    if ((r = uv_listen((uv_stream_t*) &server, 128, on_new_connection))) {

        fprintf(stderr, "Listen error %s\n", uv_err_name(r));

        return 2;

    }

    return uv_run(loop, UV_RUN_DEFAULT);

}