/*
 * MIT License
 * 
 * Copyright (c) 2020 Alessandro Mauri
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <unistd.h>
#include <limits.h>
#include "disk.h"
#include "util.h"

#define SYS_DEV_BLOCK_PATH "/sys/dev/block/"

struct disk_list *
disk_get_by_name (struct disk_list *head, const char *s)
{
	for (; head; head = head->next) {
		if (!strcmp(s, head->name))
			break;
	}
	return head;
}

void
disk_rm_by_name (struct disk_list **head, const char *s)
{
	struct disk_list *prev = NULL, *tmp = NULL;
	for (tmp = *head; tmp; prev = tmp, tmp = tmp->next) {
		if (!strcmp(s, tmp->name)) {
			if (prev)
				prev->next = tmp->next;
			else
				*head = tmp->next;
			free(tmp);
			break;
		}
	}
	return;
}

void
disk_list_free (struct disk_list **head)
{
	for (struct disk_list *tmp = *head; tmp;) {
		*head = (*head)->next;
		free(tmp);
		tmp = *head;
	}
	return;
}

/* return true if the path is the main disk (sda, sdb, etc not sda2, sdb1) */
int path_is_disk(const char *path)
{
	struct stat stbuf = {0};
	char buf[PATH_MAX] = {0};

	printf("%s\n", path);
	if (stat(path, &stbuf) < 0 || !S_ISBLK(stbuf.st_mode))
		return 0;

	if (snprintf(buf, PATH_MAX, SYS_DEV_BLOCK_PATH "%d:%d",
	major(stbuf.st_rdev), minor(stbuf.st_rdev)) >= PATH_MAX)
		return -1;
	// FIXME: possible race condition here
	snprintf(buf, PATH_MAX, "%s", get_path(buf));
	strcat(buf, "/partition");
	if (file_exists(buf) > 0)
		return 1;
	else
		return 0;
}

/* The do-all function */

/*int disk_add_disk (struct disk_list *head, const char *path)
{
	struct disk_list dt = {0};
	// verify if it is a disk
	if (!path_is_disk(path))
		return 0;
	
	// get info (real name, etc)
	
	// get partitions
	// add partitions
	
	disk_list_add(head, &dt);
	return 1;
}
*/