#include "input.h"
#include <string.h>
#include <ctype.h>

/*
Read a single word from file and store it in buffer.
Returns the length of the word, or 0 if no more words are available (EOF).
*/
static int readSingleWord(FILE *file, char buffer[MAX_WORD_LEN])
{
    int len = 0;
    int c;

    //clear leading seperators
    while((c = fgetc(file)) != EOF && (c == ',' || c == ';' || c == ' ' || c == '\n')) {}

    //check for empty file
    if(c == EOF)
        return 0;


    //read word
    do
    {
        if(len < MAX_WORD_LEN - 1) // -1 to leave space for '\0'
        {
            buffer[len] = toupper((unsigned char)c);
            len++;
        }
        c = fgetc(file);
    }
    while(c != EOF && !(c == ',' || c == ';' || c == ' ' || c == '\n'));

    //append string end-delimiter
    buffer[len] = '\0';   // '\0' marks the end of a string, we need to apend it for strcpy
    return len;
}

// Read words from file and store in 'words' array
int readWords(FILE *file, char words[][MAX_WORD_LEN], unsigned int maxWordCount)
{
    char buffer[MAX_WORD_LEN];
    unsigned int wordCount = 0;
    int len;

    while(wordCount < maxWordCount && (len = readSingleWord(file, buffer)) > 0)
        strcpy(words[wordCount++], buffer);

    return wordCount;
}