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/* Camicro - Microscope camera viewer.
 *
 * Copyright (C) 2019 Nicolas Schodet
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Contact :
 *        Web: http://ni.fr.eu.org/
 *      Email: <nico at ni.fr.eu.org>
 */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>

#include "options.h"
#include "device.h"
#include "live.h"
#include "utils.h"

void
run(struct device *device, int count, const char *out)
{
    for (int i = 0; i < count;) {
	const struct device_image *device_image = device_read(device);
	if (device_image) {
	    char *name = NULL;
	    if (asprintf(&name, out, i) < 0)
		utils_fatal("can not prepare file name");
	    utils_info("write %s", name);
	    png_image image;
	    memset(&image, 0, sizeof(image));
	    image.version = PNG_IMAGE_VERSION;
	    image.width = device_image->width;
	    image.height = device_image->height;
	    image.format = PNG_FORMAT_BGRA;
	    int r = png_image_write_to_file(&image, name, 0,
		    device_image->pixels, device_image->stride, NULL);
	    if (r == 0)
		utils_fatal("can not write image: %s", image.message);
	    free(name);
	    i++;
	}
    }
}

int
main(int argc, char **argv)
{
    struct options options;
    options_parse(argc, argv, &options);
    libusb_context *usb;
    int r = libusb_init(&usb);
    if (r)
	utils_fatal("unable to initialize libusb: %s", libusb_strerror(r));
    struct device *device = device_open(usb);
    if (!device)
	utils_fatal("unable to find device");
    const struct device_info *info = device_get_info(device);
    if (options.exposure_ms > 0.0)
	device_set_exposure(device, options.exposure_ms);
    else
	options.exposure_ms = info->exposure_default_ms;
    if (options.gain > 0.0)
	device_set_gain(device, options.gain);
    else
	options.gain = info->gain_default;
    int width = -1, height = -1;
    for (int i = 0; width == -1 && i < info->resolutions; i++) {
	const struct device_info_resolution *ir = &info->resolution[i];
	if ((options.width == -1 || options.width == ir->width)
	    && (options.height == -1 || options.height == ir->height)) {
	    width = ir->width;
	    height = ir->height;
	}
    }
    if (width == -1)
	utils_fatal("no matching resolution");
    device_set_resolution(device, width, height, 0);
    options.width = width;
    options.height = height;
    if (options.count)
	run(device, options.count, options.out);
    else
	live_run(device, &options);
    device_close(device);
    libusb_exit(usb);
    return EXIT_SUCCESS;
}