/*
 * Program to merge counts created by countalpha program.
 *
 * Names of output file and one or more input files are given as command-line 
 * arguments.
 *
 * Program merges counts and writes the result to output file.
 *
 * Programs also prints some tracking output (names of input files, error
 * messages for any input files that can't be opened, error messages if 
 * there's anything in an input file that's not in the format produced by
 * "countalpha".
 */
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <stdbool.h>

#include "alphacounters.h"

bool processfile(char * filename, letter_count_t * counters, int num_counters);

int main(int argc, char * argv[]) {

	if (argc < 3) {
		printf("usage %s outfile infile(s)\n", argv[0]);
		return 1;
	}

	int num_counters;
	letter_count_t * counters = build_alphacounters(&num_counters);
	if (counters == NULL) {
		printf("could not get space for %d counters\n", num_counters);
		return 1;
	}
	print_alphabet(stdout, counters, num_counters);

	int rval = 0;
	for (int i = 2; i < argc; ++i) {
		if (!processfile(argv[i], counters, num_counters)) rval = 1;
	}

	/* FIXME your code to write to output file goes here */

	return rval;
}

/* 
 * function to process one input file
 *
 * returns true if file could be opened and contains all good data,
 *   false if the file could not be opened or contained at least one
 *   line that's not in the right format.
 * if file could be opened, increments counters.
 */
bool processfile(char * filename, letter_count_t * counters, int num_counters) {

	printf("processing input file %s\n", filename);

	/* 
	 * FIXME your code goes here 
	 *
	 * outline:
	 *
	 * open file, printing an error message if open fails and returning
	 *   false
	 * read the file a line at a time with fgets (it returns NULL at
	 *   end of file)
	 * print a message for any lines that are too long
	 * parse lines with sscanf (format string "%c%c%ld%c" worked well
	 *   for me, and notice that sscanf returns a count similar to what
	 *   scanf returns), printing error messages for invalid lines
	 * for each line, update counter using update_counter() function
	 */
	return true;
}