///
/// @file    wc.cpp
///
/// @author  David Liang
/// @brief   Lab 01 - wc - EE 491F - Spr 2020
///

#define _CRT_SECURE_NO_DEPRECATE /* allow fopen to be used w/o error */
#define WHITESPACE(n) (n == ' ' || n == '\t' || n == '\n' || n == '\0')
#define FILESIZE 100

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



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

    /* output header */
    printf("char\tword\tline\tfile\n");

    for (int i = 1; i < argc; i++) {

        /* 1. Get the FILE from the command line. If there is no filename, post an error message: Usage:  wc FILE */

        /* no file is passed */
        if (argc == 0) {
            printf("ERROR: no file is passed");
            return 0;
        }

        /* Variable Declaration */
        FILE* fp;
        char filename[FILESIZE] = "",
             charinc = 0;
        int lines = 0,
            words = 0,
            characters = 0;



        /* 2. Try to open FILE.  If the file can’t be opened, post an error message: program: Can’t open [FILE], substituting in the filename. */
        fp = fopen(argv[i], "r");
        if (fp == NULL) {
            fprintf(stderr, "Can't open %s: %s\n", argv[i], strerror(errno));
        }
        else {
            //printf("DEBUG: it worked!\n");
            while ((charinc = fgetc(fp)) != EOF)
            {
                /* increment character count */
                if (!WHITESPACE(charinc)) {
                    characters++;
                }

                /* increment line count */
                if (charinc == '\n' || charinc == '\0') {
                    lines++;
                }

                /* increment word count */
                if (WHITESPACE(charinc)) {
                    words++;
                }
            }

            /* increment word count and line count for last word */
            if (characters > 0) {
                words++;
                lines++;
            }

            /* 3. If FILE can be processed, then count the number of chars, words and lines and output: nn <tab> ww <tab> cc <tab> FILE */
            printf("%d\t%d\t%d\t%s\n", characters, words, lines, argv[i]);
        }

        fclose(fp);
    }

    return 0;
}