#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>
#include <sys/wait.h>
#include <stdbool.h>

int gfapi = 1;

#define LOG_ERR(func, ret)                                                     \
    do {                                                                       \
        if (ret != 0) {                                                        \
            fprintf(stderr, "%s : returned error %d (%s)\n", func, ret,        \
                    strerror(errno));                                          \
            goto out;                                                          \
        } else {                                                               \
            fprintf(stderr, "%s : returned %d\n", func, ret);                  \
        }                                                                      \
    } while (0)

char lownera[8] = "lownera", lownerb[8] = "lownerb";
char lownerc[8] = "lownerc";

int
lock_test(glfs_fd_t *glfd1, glfs_fd_t *glfd2, bool should_fail, int l1_start,
          int l1_len, char *l1_owner, int lo1_len, int l2_start, int l2_len,
          char *l2_owner, int lo2_len)
{
    int ret = -1, f_ret = -1;
    struct flock lock1 =
                     {
                         0,
                     },
                 lock2 = {
                     0,
                 };

lock1:
    if (!glfd1)
        goto lock2;

    /* lock on glfd1 */
    lock1.l_type = F_WRLCK;
    lock1.l_whence = SEEK_SET;
    lock1.l_start = l1_start;
    lock1.l_len = l1_len;

    ret = glfs_fd_set_lkowner(glfd1, l1_owner, lo1_len);
    LOG_ERR("glfs_fd_set_lkowner on glfd1", ret);

    ret = glfs_posix_lock(glfd1, F_SETLK, &lock1);
    LOG_ERR("glfs_posix_lock on glfd1", ret);

lock2:
    if (!glfd2)
        goto out;

    /* lock on glfd2 */
    lock2.l_type = F_WRLCK;
    lock2.l_whence = SEEK_SET;
    lock2.l_start = l2_start;
    lock2.l_len = l2_len;

    ret = glfs_fd_set_lkowner(glfd2, l2_owner, lo2_len);
    LOG_ERR("glfs_fd_set_lkowner on glfd2", ret);

    ret = glfs_posix_lock(glfd2, F_SETLK, &lock2);

    if (should_fail && ret) {
        f_ret = 0;
    } else if (!ret && !should_fail) {
        f_ret = 0;
    } else {
        f_ret = -1;
    }
out:
    fprintf(stderr,
            "Lock test on glfd1 (start(%d), len(%d),"
            " lk_owner(%s)) and glfd2 (start(%d), len(%d), "
            "lk_owner(%s)) - expected(%s) - result(%s)\n",
            l1_start, l1_len, l1_owner, l2_start, l2_len, l2_owner,
            (should_fail ? "FAIL" : "SUCCESS"), (ret ? "FAIL" : "SUCCESS"));
    return f_ret;
}

int
main(int argc, char *argv[])
{
    glfs_t *fs = NULL;
    int ret = 0, i, status = 0;
    glfs_fd_t *fd1 = NULL;
    glfs_fd_t *fd2 = NULL;
    glfs_fd_t *fd3 = NULL;
    char *filename = "file_tmp";
    char *volname = NULL;
    char *logfile = NULL;
    char *hostname = NULL;

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

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

    fs = glfs_new(volname);
    if (!fs) {
        fprintf(stderr, "glfs_new: returned NULL\n");
        return -1;
    }

    ret = glfs_set_volfile_server(fs, "tcp", hostname, 24007);
    LOG_ERR("glfs_set_volfile_server", ret);

    ret = glfs_set_logging(fs, logfile, 7);
    LOG_ERR("glfs_set_logging", ret);

    ret = glfs_init(fs);
    LOG_ERR("glfs_init", ret);

    fd1 = glfs_creat(fs, filename, O_RDWR | O_SYNC, 0644);
    if (fd1 <= 0) {
        ret = -1;
        LOG_ERR("glfs_creat", ret);
    }
    fprintf(stderr, "glfs-create fd1 - %d\n", fd1);

    fd2 = glfs_dup(fd1);
    fprintf(stderr, "glfs-dup fd2 - %d\n", fd2);

    fd3 = glfs_open(fs, filename, O_RDWR | O_SYNC);
    if (fd2 <= 0) {
        ret = -1;
        LOG_ERR("glfs_open", ret);
    }
    fprintf(stderr, "glfs-open fd3 - %d\n", fd3);

    /* TEST 1: Conflicting ranges, same lk_owner
     * lock1 (0, 10, lownera)
     * lock2 (5, 10, lownera)
     * Expected: should not fail but get merged
     */
    ret = lock_test(fd1, fd2, false, 0, 10, lownera, 8, 5, 10, lownera, 8);
    LOG_ERR("==== glfs_lock_test_1", ret);

    /* TEST 2: Conflicting ranges, different lk_owner
     * lock1 (0, 10, lownera) - already taken
     * lock2 (5, 10, lownerb)
     * Expected: should fail and not get merged
     */
    ret = lock_test(NULL, fd2, true, 0, 10, lownera, 8, 5, 10, lownerb, 8);
    LOG_ERR("==== glfs_lock_test_2", ret);

    /* TEST 3: Different ranges, same lk_owner
     * lock1 (0, 10, lownera) - already taken
     * lock2 (30, 10, lownera)
     * Expected: should not fail
     */
    ret = lock_test(NULL, fd2, false, 0, 10, lownera, 8, 30, 10, lownera, 8);
    LOG_ERR("==== glfs_lock_test_3", ret);

    /* TEST 4: Conflicting ranges, different lk_owner
     * lock1 (0, 10, lownera) - already taken
     * lock2 (50, 10, lownerb)
     * Expected: should not fail
     */
    ret = lock_test(NULL, fd2, false, 0, 10, lownera, 8, 50, 10, lownerb, 8);
    LOG_ERR("==== glfs_lock_test_4", ret);

    /* TEST 5: Close fd1 & retry TEST2
     * lock1 (not applicable)
     * lock2 (5, 10, lownerb)
     * Expected: should succeed now
     */
    ret = glfs_close(fd1);
    LOG_ERR("glfs_close", ret);

    ret = lock_test(NULL, fd2, false, 0, 10, lownera, 8, 5, 10, lownerb, 8);
    LOG_ERR("==== glfs_lock_test_5", ret);

    /* TEST 6: Check closing fd1 doesn't flush fd2 locks
     * retry TEST 4 but with fd2 and fd3.
     * lock1 (50, 10, lownerb) - already taken
     * lock2 (55, 10, lownerc)
     * Expected: should fail
     */
    ret = lock_test(NULL, fd3, true, 50, 10, lownerb, 8, 55, 10, lownerc, 8);
    LOG_ERR("==== glfs_lock_test_6", ret);

err:
    ret = glfs_close(fd2);
    LOG_ERR("glfs_close", ret);

    ret = glfs_close(fd3);
    LOG_ERR("glfs_close", ret);

out:
    if (fs) {
        ret = glfs_fini(fs);
        fprintf(stderr, "glfs_fini(fs) returned %d\n", ret);
    }

    if (ret)
        exit(1);
    exit(0);
}