/*******************************************************************************
/
/      filename:  wc.c
/
/   description:  Implements the wc function
/
/        author:  Pelini, Nick
/      login id:  FA_12_CPS444_20
/
/         class:  CPS 456
/    instructor:  Perugini
/    assignment:  Homework #2
/
/      assigned:  September 11, 2012
/           due:  September 18, 2012
/
/******************************************************************************/

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


// how to read in file / multiple files
// check if getopt is correct
// how to check if no file specified then to read stdin
// how / when to print errors
// using argc / argv

int main(int argc, char **argv)
{
	char previousLetter = 0;
	char line[1000];
	char fileName[30];
	int length, a, i, numberOfWords, numberOfLines, numberOfChars, numberOfFiles = 0;
	int totalWords, totalLines, totalChars = 0;
	FILE *openedFile;
	extern char *optarg;
	extern int optind;
	int c, err = 0;
	int lFlag=0, wFlag=0, mFlag=0;
	//char *sname = "default_sname", *fname;
	//static char usage[] = "usage: %s [-dmp] -f fname [-s sname] name [name ...]\n";

	// Sets flag if user specifies an option
	while ((c = getopt(argc, argv, "l::w::m::")) != -1)
		switch (c) {
		case 'l':
			lFlag = 1;
			break;
		case 'w':
			wFlag = 1;
			break;
		case 'm':
			mFlag = 1;
			break;
		case '?':
			err = 1;
			break;
	}

	// use argv and argc to check if filenames were entered
	if (argc > 1)
	{
		a = 1;
		while (a < argc)
		{
			if (argv[a][0] == '-')
			{

				a++;
			}
			else
			{
				numberOfFiles++;
				// Get filename and open file
				strncpy(fileName, argv[a], 30);
				openedFile = fopen(fileName, "r");
				// Read through file and count until EOF reached
				while (!feof(openedFile))
				{
					if (fgets (line, 1000, openedFile) != NULL)
					{
						length = strlen(line);
						if (length > 0)
						{
							previousLetter = line[0];
						}
						for (i=0; i < (length - 1); i++)
						{
							if (!isspace(line[i]) && isspace(previousLetter) && line[i] != EOF)
							{
								numberOfWords++;
							}
							numberOfChars++;
							previousLetter = line[i];
						}
						numberOfChars++;
						numberOfLines++;
					}
				}
			}
			// Keep tota1l values in case a next file is read
			totalWords = totalWords + numberOfWords;
			totalLines = totalLines + numberOfLines;
			totalChars = totalChars + numberOfChars;
			// Close the file
			fclose(openedFile);
			// Increment argv count
			a++;
		}
	}

	// Read stdin because no files specified
	// Only enter loop if no files
	if (numberOfFiles == 0)
	{
		while (!feof(stdin))
		{
			if (fgets (line, 1000, stdin) != NULL)
			{
				length = strlen(line);
				if (length > 0)
				{
					previousLetter = line[0];
				}
				for (i=0; i < (length - 1); i++)
				{
					if (!isspace(line[i]) && isspace(previousLetter) && line[i] != EOF)
					{
						totalWords++;
					}
					totalChars++;
					previousLetter = line[i];
				}
				totalChars++;
				totalLines++;
			}
		}
	}

	// ****Use field width and precision****
	//  Output totals depending on options inputted
	if (lFlag == 1) {
		printf("%d ", numberOfLines);
	} else if (wFlag == 1) {
		printf("%d ", numberOfWords);
	} else if (mFlag == 1) {
		printf("%d/n", numberOfChars);
	} else if (lFlag == 0 && wFlag == 0 && mFlag == 0) {
		printf("%d ", totalLines);
		printf("%d ", totalWords);
		printf("%d\n", totalChars);
	} else if (err) {
		fprintf(stderr, "invalid option -- ", argv[0]);
		exit(1);
	}

	exit(0);
}