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/*
 * Copyright (c) 2008 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vfs/vfs.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <devmap.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "../tester.h"

#define FS_TYPE      "tmpfs"
#define MOUNT_POINT  "/tmp"
#define OPTIONS      ""
#define FLAGS        0

#define TEST_DIRECTORY  MOUNT_POINT "/testdir"
#define TEST_FILE       TEST_DIRECTORY "/testfile"
#define TEST_FILE2      TEST_DIRECTORY "/nextfile"

#define MAX_DEVICE_NAME  32
#define BUF_SIZE         16

static char text[] = "Lorem ipsum dolor sit amet, consectetur adipisicing elit";

static char *read_root(void)
{
    TPRINTF("Opening the root directory...");
    
    DIR *dirp = opendir("/");
    if (!dirp) {
        TPRINTF("\n");
        return "opendir() failed";
    } else
        TPRINTF("OK\n");
    
    struct dirent *dp;
    while ((dp = readdir(dirp)))
        TPRINTF(" node \"%s\"\n", dp->d_name);
    closedir(dirp);
    
    return NULL;
}

char *test_vfs1(void)
{
    if (mkdir(MOUNT_POINT, 0) != 0)
        return "mkdir() failed";
    TPRINTF("Created directory %s\n", MOUNT_POINT);
    
    char null[MAX_DEVICE_NAME];
    int null_id = devmap_null_create();
    
    if (null_id == -1)
        return "Unable to create null device";
    
    snprintf(null, MAX_DEVICE_NAME, "null%d", null_id);
    int rc = mount(FS_TYPE, MOUNT_POINT, null, OPTIONS, FLAGS);
    switch (rc) {
    case EOK:
        TPRINTF("Mounted /dev/%s as %s on %s\n", null, FS_TYPE, MOUNT_POINT);
        break;
    case EBUSY:
        TPRINTF("(INFO) Filesystem already mounted on %s\n", MOUNT_POINT);
        break;
    default:
        TPRINTF("(ERR) IPC returned errno %d (is tmpfs loaded?)\n", rc);
        return "mount() failed";
    }
    
    if (mkdir(TEST_DIRECTORY, 0) != 0)
        return "mkdir() failed";
    TPRINTF("Created directory %s\n", TEST_DIRECTORY);
    
    int fd0 = open(TEST_FILE, O_CREAT);
    if (fd0 < 0)
        return "open() failed";
    TPRINTF("Created file %s (fd=%d)\n", TEST_FILE, fd0);
    
    size_t size = sizeof(text);
    ssize_t cnt = write(fd0, text, size);
    if (cnt < 0)
        return "write() failed";
    TPRINTF("Written %d bytes\n", cnt);
    
    if (lseek(fd0, 0, SEEK_SET) != 0)
        return "lseek() failed";
    TPRINTF("Sought to position 0\n");
    
    char buf[BUF_SIZE];
    while ((cnt = read(fd0, buf, BUF_SIZE))) {
        if (cnt < 0)
            return "read() failed";
        
        TPRINTF("Read %d bytes: \".*s\"\n", cnt, cnt, buf);
    }
    
    close(fd0);
    
    char *rv = read_root();
    if (rv != NULL)
        return rv;
    
    if (rename(TEST_FILE, TEST_FILE2))
        return "rename() failed";
    TPRINTF("Renamed %s to %s\n", TEST_FILE, TEST_FILE2);
    
    if (unlink(TEST_FILE2))
        return "unlink() failed";
    TPRINTF("Unlinked %s\n", TEST_FILE2);
    
    if (rmdir(TEST_DIRECTORY))
        return "rmdir() failed";
    TPRINTF("Removed directory %s\n", TEST_DIRECTORY);
    
    rv = read_root();
    if (rv != NULL)
        return rv;
    
    return NULL;
}