#include <stdio.h>
#include <float.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int parse_double(const char *str, double *res) {
	char *ptr;

	*res = strtod(str, &ptr);
	if (*ptr)
		return 0;

	return 1;
}

void print(double diff, char *str, double min) {
	double val = 0;
	if (!parse_double(str, &val))
		return;

	putchar('\xe2');
	putchar('\x96');
	putchar('\x81' + (int)round((val - min + 1) / diff * 7));
}

int main(int argc, char **argv) {
	if (argc == 1) {
		fprintf(stderr, "spark: missing operands\n");
		return 1;
	}

	unsigned int r_flag = 0;
	char ret = '\n';

	double min = DBL_MAX;
	double max = DBL_MIN;

	/* Remove programm name */
	argv++;
	argc--;

	for (int i = 0; i < argc; i++) {
		double val = 0;
		if (strstr(argv[i], "r"))
			r_flag = 1;

		else if (strstr(argv[i], "n"))
			ret = '\r';

		else if (parse_double(argv[i], &val)) {
			if (val > max)
				max = val;

			if (val < min)
				min = val;
		}

		else {
			printf("spark [num1 num2...]\n\t[-n Use \\r] [-r Reverse]\n");
			return 0;
		}
	}

	double diff = max - min + 1;
	if (diff < 1)
		diff = 1;

	if (r_flag)
		for (int i = argc - 1; i >= 0; i--)
			print(diff, argv[i], min);

	else
		for (int i = 0; i < argc; i++)
			 print(diff, argv[i], min);

	putchar(ret);
	return 0;
}