/*
 * Copyright © 2012 Keith Packard <keithp@keithp.com>
 *
 * 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; version 2 of the License.
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */

#include <err.h>
#include <fcntl.h>
#include <gelf.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <stdbool.h>
#include "ao-elf.h"
#include "ccdbg.h"
#include "cc-usb.h"
#include "cc.h"
#include "ao-usbload.h"
#include "ao-selfload.h"
#include "ao-verbose.h"
#include "ao-editaltos.h"

static uint16_t
get_uint16(struct cc_usb *cc, uint32_t addr)
{
	uint16_t	result;
	result = ao_self_get_uint16(cc, addr);
	printf ("read 0x%08x = 0x%04x\n", addr, result);
	return result;
}

/*
 * Read a 32-bit value from the target device with arbitrary
 * alignment
 */
static uint32_t
get_uint32(struct cc_usb *cc, uint32_t addr)
{
	uint32_t	result;

	result = ao_self_get_uint32(cc, addr);
	printf ("read 0x%08x = 0x%08x\n", addr, result);
	return result;
}

/*
 * Check to see if the target device has been
 * flashed with a similar firmware image before
 *
 * This is done by looking for the same romconfig version,
 * which should be at the same location as the linker script
 * places this at 0x100 from the start of the rom section
 */
static int
check_flashed(struct cc_usb *cc)
{
	uint16_t	romconfig_version = get_uint16(cc, AO_ROMCONFIG_VERSION);
	uint16_t	romconfig_check = get_uint16(cc, AO_ROMCONFIG_CHECK);

	if (romconfig_version != (uint16_t) ~romconfig_check) {
		fprintf (stderr, "Device has not been flashed before\n");
		return 0;
	}
	return 1;
}

static const struct option options[] = {
	{ .name = "tty", .has_arg = 1, .val = 'T' },
	{ .name = "device", .has_arg = 1, .val = 'D' },
	{ .name = "raw", .has_arg = 0, .val = 'r' },
	{ .name = "cal", .has_arg = 1, .val = 'c' },
	{ .name = "serial", .has_arg = 1, .val = 's' },
	{ .name = "verbose", .has_arg = 1, .val = 'v' },
	{ 0, 0, 0, 0},
};

static void usage(char *program)
{
	fprintf(stderr, "usage: %s [--raw] [--verbose=<verbose>] [--device=<device>] [-tty=<tty>] [--cal=<radio-cal>] [--serial=<serial>] file.{elf,ihx}\n", program);
	exit(1);
}

void
done(struct cc_usb *cc, int code)
{
/*	cc_usb_printf(cc, "a\n"); */
	cc_usb_close(cc);
	exit (code);
}

static int
ends_with(char *whole, char *suffix)
{
	int whole_len = strlen(whole);
	int suffix_len = strlen(suffix);

	if (suffix_len > whole_len)
		return 0;
	return strcmp(whole + whole_len - suffix_len, suffix) == 0;
}

int
main (int argc, char **argv)
{
	char			*device = NULL;
	char			*filename;
	Elf			*e;
	int			raw = 0;
	char			*serial_end;
	unsigned int		serial = 0;
	char			*serial_ucs2;
	int			serial_ucs2_len;
	char			serial_int[2];
	unsigned int		s;
	int			i;
	int			string_num;
	uint32_t		cal = 0;
	char			cal_int[4];
	char			*cal_end;
	int			c;
	int			was_flashed = 0;
	struct ao_hex_image	*load;
	int			tries;
	struct cc_usb		*cc = NULL;
	char			*tty = NULL;
	int			success;
	int			verbose = 0;
	struct ao_sym		*file_symbols;
	int			num_file_symbols;

	while ((c = getopt_long(argc, argv, "rT:D:c:s:v:", options, NULL)) != -1) {
		switch (c) {
		case 'T':
			tty = optarg;
			break;
		case 'D':
			device = optarg;
			break;
		case 'r':
			raw = 1;
			break;
		case 'c':
			cal = strtoul(optarg, &cal_end, 10);
			if (cal_end == optarg || *cal_end != '\0')
				usage(argv[0]);
			break;
		case 's':
			serial = strtoul(optarg, &serial_end, 10);
			if (serial_end == optarg || *serial_end != '\0')
				usage(argv[0]);
			break;
		case 'v':
			verbose++;
			break;
		default:
			usage(argv[0]);
			break;
		}
	}

	ao_verbose = verbose;

	if (verbose > 1)
		ccdbg_add_debug(CC_DEBUG_BITBANG);

	filename = argv[optind];
	if (filename == NULL)
		usage(argv[0]);

	if (ends_with (filename, ".elf")) {
		load = ao_load_elf(filename, &file_symbols, &num_file_symbols);
	} else if (ends_with (filename, ".ihx")) {
		load = ao_hex_load(filename, &file_symbols, &num_file_symbols);
	} else
		usage(argv[0]);

	if (!raw) {
		if (!ao_editaltos_find_symbols(file_symbols, num_file_symbols, ao_symbols, ao_num_symbols)) {
			fprintf(stderr, "Cannot find required symbols\n");
			usage(argv[0]);
		}
	}

	{
		int	is_loader;
		int	tries;

		for (tries = 0; tries < 3; tries++) {
			char	*this_tty = tty;
			if (!this_tty)
				this_tty = cc_usbdevs_find_by_arg(device, "AltosFlash");
			if (!this_tty)
				this_tty = cc_usbdevs_find_by_arg(device, "TeleMega");
			if (!this_tty)
				this_tty = getenv("ALTOS_TTY");
			if (!this_tty)
				this_tty="/dev/ttyACM0";

			cc = cc_usb_open(this_tty);

			if (!cc)
				exit(1);
			cc_usb_printf(cc, "v\n");
			is_loader = 0;
			for (;;) {
				char	line[256];
				cc_usb_getline(cc, line, sizeof(line));
				if (!strncmp(line, "altos-loader", 12))
					is_loader = 1;
				if (!strncmp(line, "software-version", 16))
					break;
			}
			if (is_loader)
				break;
			printf ("rebooting to loader\n");
			cc_usb_printf(cc, "X\n");
			cc_usb_close(cc);
			sleep(1);
			cc = NULL;
		}
		if (!is_loader) {
			fprintf(stderr, "Cannot switch to boot loader\n");
			exit(1);
		}
#if 0
		{
			uint8_t	check[256];
			int	i = 0;

			ao_self_block_read(cc, AO_BOOT_APPLICATION_BASE, check);
			for (;;) {
				uint8_t block[256];
				putchar ('.');
				if (++i == 40) {
					putchar('\n');
					i = 0;
				}
				fflush(stdout);
				ao_self_block_write(cc, AO_BOOT_APPLICATION_BASE, block);
				ao_self_block_read(cc, AO_BOOT_APPLICATION_BASE, block);
				if (memcmp(block, check, 256) != 0) {
					fprintf (stderr, "read differed\n");
					exit(1);
				}
			}
		}
#endif
	}

	if (!raw) {
		/* Go fetch existing config values
		 * if available
		 */
		was_flashed = check_flashed(cc);

		if (!serial) {
			if (!was_flashed) {
				fprintf (stderr, "Must provide serial number\n");
				done(cc, 1);
			}
			serial = get_uint16(cc, AO_SERIAL_NUMBER);
			if (!serial || serial == 0xffff) {
				fprintf (stderr, "Invalid existing serial %d\n", serial);
				done(cc, 1);
			}
		}

		if (!cal && AO_RADIO_CAL && was_flashed) {
			cal = get_uint32(cc, AO_RADIO_CAL);
			if (!cal || cal == 0xffffffff) {
				fprintf (stderr, "Invalid existing rf cal %d\n", cal);
				done(cc, 1);
			}
		}

		if (!ao_editaltos(load, serial, cal))
			done(cc, 1);
	}

	/* And flash the resulting image to the device
	 */
	success = ao_self_write(cc, load);
		
	if (!success) {
		fprintf (stderr, "\"%s\": Write failed\n", filename);
		done(cc, 1);
	}

	done(cc, 0);
}