#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "library.h"

/*

ref: http://primepuzzle.com/lee-bradley/mini.challenges.html

gcc chapter.8.c library.o -o chapter.8

prints the average pace for each num contiguous records,
the fastest average pace of any num contiguous records,
the slowest average pace of any num contiguous records

the data file consists of records like this

3.6,12:25
3.7,12:29
3.8,11:20

*/

int main(int argc, char *argv[])
{
	char *index;
	int i, verbose = 0;
	float foo, f1, total, total_seconds, min = 99999, max = 0;
	char records[1000][30] = {{""}};
	printf("\nchapter.8.c - 2/15/23 - lrb\n");
	char filename[30] = "";
	int num = 30;
	printf("\nUsage : chapter.8 -f filename [-n num] [-v]\n");
	for (i = 1;i < argc;i++) {
		if (strcmp(argv[i],"-n") == 0) num = atoi(argv[++i]);
		if (strcmp(argv[i],"-f") == 0) strcpy(filename, argv[++i]);
		if (strcmp(argv[i],"-v") == 0) verbose = 1;
	}
	char buffer[5000] = {0};
	FILE *fp;
	if ((fp = fopen(filename, "r")) == NULL) {
		printf("\nerror on file open");exit(1);
	}
	fread(buffer, 1, 5000, fp);
	fclose(fp);
	int record_count = 0;
	i = 0;
	char records_work[30];
	while ((index = strchr(buffer, '\n')) != 0) {
		++record_count;
		*index = 0;
		strcpy(records[i++], buffer);
		strcpy(buffer, ++index);
	}
	printf("\nrecord count %d\n", record_count);
	if (num >= record_count) {
		printf("\n-n option of %d must not be >= %d" \
		,num,record_count);exit(1);
	}
	int start_record = 0;
	while (start_record+num < record_count) {
		total_seconds = 0;
		for (i = start_record;i < start_record+num;++i) {
			strcpy(records_work, records[i]);
			f1 = strtof(records_work, NULL);
			foo = 1/f1*3600; // convert mph to spm
			if (verbose) printf("\nseconds per mile %.2f", foo);
			total = foo;
			total_seconds += total;
		}
		total_seconds /= num;
		if (total_seconds > max) max = total_seconds;
		if (total_seconds < min) min = total_seconds;
		printf("\n\naverage pace over this %d record stretch ", num);
		show_pace("", (int)total_seconds);
		putchar(10);
		++start_record;
	}
	show_pace("\nfastest average pace", (int)min);
	show_pace("\nslowest average pace", (int)max);
	putchar(10);
	exit(0);
}