/*
 * This file is part of libsamsung-ipc.
 *
 * Copyright (C) 2021 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
 *
 * libsamsung-ipc is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * libsamsung-ipc is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with libsamsung-ipc.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/stat.h>
#include <sys/types.h>

#include <samsung-ipc.h>

#include <partitions/android/android.h>
#include "android.h"

static char const * const dummy_modem_image_paths[] = {
	/* We can't use mktemp here since everything is const
	 * echo libsamsung-ipc | sha1sum | cut -c-20
	 * gives 55f4731d2e11e85bd889
	 */
	"/tmp/libsamsung-ipc.55f4731d2e11e85bd889/modem.img",
	NULL
};

int delete_dummy_modem_image(struct ipc_client *client,
			     __attribute__((unused)) const char * const path)
{
	int rc;
	char *endp;
	char *dir;

	rc = unlink(path);
	if (rc == -1) {
		rc = errno;
		if (rc != ENOENT) {
			ipc_client_log(client,
				       "%s: unlink %s failed with error %d: %s",
				       __func__, path, rc, strerror(rc));
			errno = rc;
			return -1;
		}
	}

	endp = strrchr(path, '/');

	dir = malloc(endp - path + 1);
	if (dir == NULL) {
		rc = errno;
		ipc_client_log(client,
			       "%s: calloc failed with error %d: %s",
			       __func__, rc, strerror(rc));
		errno = rc;
		return -1;

	}

	memcpy(dir, path, endp - path);
	dir[endp - path] = '\0';

	rc = rmdir(dir);
	if (rc == -1) {
		rc = errno;
		if (rc != ENOENT) {
			ipc_client_log(client,
				       "%s: rmdir %s failed with error %d: %s",
				       __func__, dir, rc, strerror(rc));

			free(dir);
			errno = rc;
			return -1;
		}
	}

	free(dir);
	return 0;
}


int create_dummy_modem_image(struct ipc_client *client,
			     __attribute__((unused)) const char * const path)
{
	int fd;
	int rc;

	rc = mkdir("/tmp/", 0755);
	if (rc == -1) {
		rc = errno;
		if (rc != EEXIST) {
			ipc_client_log(client,
				       "%s: mkdir %s failed with error %d: %s",
				       __func__, "/tmp/", rc, strerror(rc));
			return -1;
		}
	}

	rc = mkdir("/tmp/libsamsung-ipc.55f4731d2e11e85bd889/", 0755);
	if (rc == -1) {
		rc = errno;
		if (rc != EEXIST) {
			ipc_client_log(client,
				       "%s: mkdir %s failed with error %d: %s",
				       __func__,
				       "/tmp/libsamsung-ipc.55f4731d2e11e85bd889/",
				       rc, strerror(rc));
			return -1;
		}
	}

	fd = open("/tmp/libsamsung-ipc.55f4731d2e11e85bd889/modem.img",
		  O_CREAT, 0755);
	if (fd == -1) {
		rc = errno;
		ipc_client_log(client,
			       "%s: open %s failed with error %d: %s",
			       __func__,
			       "/tmp/libsamsung-ipc.55f4731d2e11e85bd889/modem.img",
			       rc, strerror(rc));
		goto error;
	}

	rc = close(fd);
	if (rc == -1) {
		rc = errno;
		ipc_client_log(client,
			       "%s: close %s failed with error %d: %s",
			       __func__,
			       "/tmp/libsamsung-ipc.55f4731d2e11e85bd889/modem.img",
			       rc, strerror(rc));
		goto error;
	}

	return 0;

error:
	rc = delete_dummy_modem_image(
		client, "/tmp/libsamsung-ipc.55f4731d2e11e85bd889/modem.img");
	if (rc == -1)
		ipc_client_log(client,
			       "%s: delete_dummy_modem_image %s failed with error -1",
			       __func__);
	return -1;
}

int test_open_android_modem_partition(struct ipc_client *client)
{
	int i;
	int rc;

	for (i = 0; dummy_modem_image_paths[i] != NULL; i++) {
		rc = create_dummy_modem_image(client,
					      dummy_modem_image_paths[i]);
		if (rc == -1) {
			ipc_client_log(
				client,
				"%s: create_dummy_modem_image(client, %s)"
				" failed\n",
				__func__, dummy_modem_image_paths[i]);
			return -1;
		}
	}

	rc = open_android_modem_partition(client, dummy_modem_image_paths);
	if (rc == -1) {
		rc = errno;
		ipc_client_log(client, "%s: open_android_modem_partition"
			       " failed with errror %d: %s\n",
			       __func__, rc, strerror(rc));
		errno = rc;
		return -1;
	}

	rc = close(rc);
	if (rc == -1) {
		rc = errno;
		ipc_client_log(client,
			       "%s: close() failed with errror %d: %s\n",
			       __func__, rc, strerror(rc));
		return -1;
	}

	rc = delete_dummy_modem_image(
		client, "/tmp/libsamsung-ipc.55f4731d2e11e85bd889/modem.img");
	if (rc == -1) {
		rc = errno;
		ipc_client_log(client,
			       "%s: delete_dummy_modem_image() failed with errror %d: %s\n",
			       __func__, rc, strerror(rc));
		return -1;
	}

	return 0;
}