#include <getopt.h>
#include <string.h>
#include <stdlib.h>
#include <string.h>

#include "options.h"
#include "debug.h"

void print_help_and_die(const char *exec_name)
{
	pr_info("Usage: %s [option]\n", exec_name);
	pr_info("  -d, --device=DEVICE     path to the serial device\n");
	pr_info("                          default: /dev/ttyUSB0\n");
	pr_info("  -b, --baud=BAUD         device baud rate, default 128000\n");
	pr_info("  -o, --output            logfile path, stdout only if omited\n");
	pr_info("  -v, --verbose           increase verbosity\n");
	pr_info("  -q, --quiet             decrease verbosity\n");
	pr_info("  -h, --help              show this help\n");

	exit(0);
}

static void set_default_options(struct plotter_options *opts)
{
	bzero(opts, sizeof(*opts));

	opts->baud_rate = 128000;
	opts->device_path = "/dev/ttyUSB0";
}

int read_args(int argc, char *argv[], struct plotter_options *opts)
{
	int option_index = 0, c;
	static struct option long_options[] = {
		{ .val = 'd', .name = "device", .has_arg = 1, },
		{ .val = 'o', .name = "output", .has_arg = 1 },
		{ .val = 'b', .name = "baud", .has_arg = 1 },
		{ .val = 'v', .name = "verbose", .has_arg = 2 },
		{ .val = 'q', .name = "quiet", },
		{ .val = 'h', .name = "help", },
	};
	char short_options[] = "d:o:b:vqh";

	set_default_options(opts);

	while (1) {
		c = getopt_long(argc, argv, short_options, long_options,
				&option_index);

		if (c == -1)
			break;

		switch (c) {
		case 'd':
			opts->device_path = optarg;
			break;
		case 'o':
			opts->output_path = optarg;
			break;
		case 'b':
			opts->baud_rate = atoi(optarg);
			break;
		case 'v':
			trace_level++;
			pr_debug("Increased trace level to %d\n", trace_level);
			break;
		case 'q':
			trace_level--;
			pr_debug("Degreased trace level to %d\n", trace_level);
			break;
		case 'h':
			print_help_and_die(argv[0]);
			break;
		case '?':
			return -1;
		}
	}

	while (optind < argc) {
		/* The rest of the options, ignored */
		optind++;
	}

	return 0;
}