/*
 * Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <endian.h>
#include <sys/types.h>

#include "lg-downloader.h"
#include "hdlc.h"
#include "usb.h"
#include "download.h"

static int download_response_check(struct download_response *response)
{
	if (response == NULL)
		return -1;

	if (response->ack != DOWNLOAD_ACK)
		return -1;

	return 0;
}

static int download_response(struct context *context)
{
	struct download_response response;
	int rc;

	rc = hdlc_recv(context, &response, sizeof(response));
	if (rc < 0)
		return -1;

	rc = download_response_check(&response);
	if (rc < 0)
		return -1;

	return 0;
}

static int download_request(struct context *context, uint8_t command)
{
	struct download_request request;
	int rc;

	memset(&request, 0, sizeof(request));
	request.command = command;

	rc = hdlc_send(context, &request, sizeof(request));
	if (rc < 0)
		return -1;

	return 0;
}

int download_start_flash_write(struct context *context)
{
	int rc;

	rc = download_request(context, DOWNLOAD_START_FLASH_WRITE);
	if (rc < 0)
		return -1;

	rc = download_response(context);
	if (rc < 0)
		return -1;

	return 0;
}

int download_write(struct context *context, void *buffer, off_t address, size_t length)
{
	struct download_write_request request;
	struct download_response response;
	int rc;

	memset(&request, 0, sizeof(request));
	request.command = DOWNLOAD_WRITE;
	request.address = htole32(address);
	request.length = htole32(length);

	rc = hdlc_send(context, &request, sizeof(request));
	if (rc < 0)
		return -1;

	rc = usb_send(context, buffer, length);
	if (rc < 0)
		return -1;

	rc = hdlc_recv(context, &response, sizeof(response));
	if (rc < 0)
		return -1;

	if (response.ack != DOWNLOAD_WRITE)
		return -1;

	return 0;
}

int download_erase(struct context *context, off_t address, size_t length)
{
	struct download_erase_request request;
	int rc;

	memset(&request, 0, sizeof(request));
	request.command = DOWNLOAD_ERASE;
	request.address = htole32(address);
	request.length = htole32(length);

	rc = hdlc_send(context, &request, sizeof(request));
	if (rc < 0)
		return -1;

	rc = download_response(context);
	if (rc < 0)
		return -1;

	return 0;
}

int download_read(struct context *context, void *buffer, size_t length)
{
	struct download_read_request request;
	int rc;

	memset(&request, 0, sizeof(request));
	request.command = DOWNLOAD_READ;
	request.length = htole32(length);

	rc = hdlc_send(context, &request, sizeof(request));
	if (rc < 0)
		return -1;

	rc = usb_recv(context, buffer, length);
	if (rc < 0)
		return -1;

	return 0;
}

int download_initialize_partition(struct context *context, off_t address, size_t length)
{
	struct download_initialize_partition_request request;
	int rc;

	memset(&request, 0, sizeof(request));
	request.command = DOWNLOAD_INITIALIZE_PARTITION;
	request.address = htole32(address);
	request.length = htole32(length);

	rc = hdlc_send(context, &request, sizeof(request));
	if (rc < 0)
		return -1;

	rc = download_response(context);
	if (rc < 0)
		return -1;

	return 0;
}

int download_ready_read(struct context *context, off_t address, size_t length)
{
	struct download_ready_read_request request;
	int rc;

	memset(&request, 0, sizeof(request));
	request.command = DOWNLOAD_READY_READ;
	request.address = htole32(address);
	request.length = htole32(length);

	rc = hdlc_send(context, &request, sizeof(request));
	if (rc < 0)
		return -1;

	rc = download_response(context);
	if (rc < 0)
		return -1;

	return 0;
}

int download_reset(struct context *context)
{
	int rc;

	rc = download_request(context, DOWNLOAD_RESET);
	if (rc < 0)
		return -1;

	rc = download_response(context);
	if (rc < 0)
		return -1;

	return 0;
}

int download_notify_start_dl(struct context *context)
{
	int rc;

	rc = download_request(context, DOWNLOAD_NOTIFY_START_DL);
	if (rc < 0)
		return -1;

	rc = download_response(context);
	if (rc < 0)
		return -1;

	return 0;
}