#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <glusterfs/api/glfs.h>
#include <glusterfs/api/glfs-handles.h>

#define LOG_ERR(msg)                                                           \
    do {                                                                       \
        fprintf(stderr, "%s : Error (%s)\n", msg, strerror(errno));            \
    } while (0)

int cbk_complete = 0;
int cbk_ret_val = -1;

int
fill_iov(struct iovec *iov, char fillchar, int count)
{
    int ret = -1;

    iov->iov_base = malloc(count + 1);
    if (iov->iov_base == NULL) {
        return ret;
    } else {
        iov->iov_len = count;
        ret = 0;
    }
    memset(iov->iov_base, fillchar, count);
    memset(iov->iov_base + count, '\0', 1);

    return ret;
}

glfs_t *
init_glfs(const char *hostname, const char *volname, const char *logfile)
{
    int ret = -1;
    glfs_t *fs = NULL;

    fs = glfs_new(volname);
    if (!fs) {
        LOG_ERR("glfs_new failed");
        return NULL;
    }

    ret = glfs_set_volfile_server(fs, "tcp", hostname, 24007);
    if (ret < 0) {
        LOG_ERR("glfs_set_volfile_server failed");
        goto out;
    }

    ret = glfs_set_logging(fs, logfile, 7);
    if (ret < 0) {
        LOG_ERR("glfs_set_logging failed");
        goto out;
    }

    ret = glfs_init(fs);
    if (ret < 0) {
        LOG_ERR("glfs_init failed");
        goto out;
    }

    ret = 0;
out:
    if (ret) {
        glfs_fini(fs);
        fs = NULL;
    }

    return fs;
}

void
write_async_cbk(glfs_fd_t *fd, ssize_t ret, struct stat *prestat,
                struct stat *poststat, void *cookie)
{
    if (ret < 0) {
        LOG_ERR("glfs_write failed");
    }
    cbk_ret_val = ret;
    cbk_complete = 1;
}

int
write_async(glfs_t *fs, glfs_fd_t *glfd, int char_count)
{
    ssize_t ret = -1;
    int flags = O_RDWR;
    const char *buff = "This is from my prog\n";
    struct iovec iov = {0};
    void *write_cookie = NULL;
    void *read_cookie = NULL;

    ret = fill_iov(&iov, 'a', char_count);
    if (ret) {
        LOG_ERR("failed to create iov");
        goto out;
    }

    write_cookie = strdup("write_cookie");
    ret = glfs_pwritev_async(glfd, &iov, 1, 0, flags, write_async_cbk,
                             &write_cookie);
out:
    if (ret < 0) {
        LOG_ERR("glfs_pwritev async failed");
    }
    return ret;
}

int
main(int argc, char *argv[])
{
    int ret = 0;
    char *hostname = NULL;
    char *volname = NULL;
    char *logfile = NULL;
    glfs_t *fs = NULL;
    const char *filename = "glfs_test.txt";
    int flags = (O_RDWR | O_CREAT);
    glfs_fd_t *glfd = NULL;
    int count = 200;

    if (argc != 4) {
        fprintf(stderr, "Invalid argument\n");
        exit(1);
    }

    hostname = argv[1];
    volname = argv[2];
    logfile = argv[3];

    fs = init_glfs(hostname, volname, logfile);
    if (fs == NULL) {
        LOG_ERR("init_glfs failed");
        return -1;
    }

    glfd = glfs_creat(fs, filename, flags, 0644);
    if (glfd == NULL) {
        LOG_ERR("glfs_creat failed");
        exit(1);
    }

    ret = write_async(fs, glfd, count);
    if (ret) {
        LOG_ERR("glfs_test_function failed");
        exit(1);
    }

    while (cbk_complete != 1) {
        sleep(1);
    }

    ret = glfs_close(glfd);
    if (ret < 0) {
        LOG_ERR("glfs close  failed");
    }

    /*
     * skipping fini
     */

    if (cbk_ret_val == count)
        return 0;
    else
        return -1;
}