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#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <curl/curl.h>

static int ping(CURL *curl, const char *send_payload)
{
    size_t sent;
    CURLcode result =
            curl_ws_send(curl, send_payload, strlen(send_payload), &sent, 0,
                         CURLWS_PING);
    return (int)result;
}

static int recv_pong(CURL *curl, const char *expected_payload)
{
    size_t rlen;
    const struct curl_ws_frame *meta;
    char buffer[256];
    CURLcode result = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
    if(!result) {
        if(meta->flags & CURLWS_PONG) {
            int same = 0;
            fprintf(stderr, "ws: got PONG back\n");
            if(rlen == strlen(expected_payload)) {
                if(!memcmp(expected_payload, buffer, rlen)) {
                    fprintf(stderr, "ws: got the same payload back\n");
                    same = 1;
                }
            }
            if(!same)
                fprintf(stderr, "ws: did NOT get the same payload back\n");
        }
        else {
            fprintf(stderr, "recv_pong: got %u bytes rflags %x\n", (int)rlen,
                    meta->flags);
        }
    }
    fprintf(stderr, "ws: curl_ws_recv returned %u, received %u\n",
            (unsigned int)result, (unsigned int)rlen);
    return (int)result;
}

static int recv_any(CURL *curl)
{
    size_t rlen;
    const struct curl_ws_frame *meta;
    char buffer[256];
    CURLcode result = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
    printf("%s\n", buffer);
    if(result)
        return result;

    return 0;
}

/* close the connection */
static void websocket_close(CURL *curl)
{
    size_t sent;
    (void)curl_ws_send(curl, "", 0, &sent, 0, CURLWS_CLOSE);
}

static void websocket(CURL *curl)
{
    int i = 0;
    do {
        recv_any(curl);
        if(ping(curl, "foobar"))
            return;
        if(recv_pong(curl, "foobar")) {
            return;
        }
        sleep(2);
    } while(i++ < 10);
    websocket_close(curl);
}

int main(void)
{
    CURL *curl;
    CURLcode res;

    curl = curl_easy_init();

    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "wss://api.csgoroll.com/graphql");

        curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 2L); /* websocket style */
        /* Perform the request, res will get the return code */
        res = curl_easy_perform(curl);
        /* Check for errors */
        if(res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));
        else {
            /* connected and ready */
            websocket(curl);
        }

        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    return 0;
}