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

int main()
{
    FILE *input;
    input = fopen("C:\\Users\\zatovicovci\\Desktop\\Martin\\colours.txt", "r");
    FILE *output;
    output = fopen("C:\\Users\\zatovicovci\\Desktop\\Martin\\colours_RGB.txt", "w");

    if (input == NULL) {
        printf("Cannot open the selected FILE.\n");
    }

    int CountLines = 0;
    int ValidLines = 0;
    int i = 0;
    int see = 1;
    char read[256];
    char copy[256];

    char red[3];
    char green[3];
    char blue[3];

    long int red_int, green_int, blue_int;

    while(fgets(read, sizeof(read), input) != NULL)
        {
            if(read == '\n')
            {
                continue;
            }

            CountLines += 1;
            int len = strlen(read);

            if (len > 0 && read[len - 1] != '\n')
            {
                read[len] = '\n';
                strncpy(copy, read, len);
            }
            else
            {
                strncpy(copy, read, strlen(read));
                copy[strlen(copy) - 1] = '\0';
            }

            if(strlen(read) < 7)
            {
                continue;
            }

            if(strlen(read) > 7)
            {
                continue;
            }

            i = 0;

            for(i = 0; i <= 6; i += 1)
            {
                if((read[i] >= '0' && read[i] <= '9') || (read[i] >= 'a' && read[i] <= 'f') || (read[i] >= 'A' && read[i] <= 'F'))
                {
                    ValidLines += 1;

                    red[0] = read[0];
                    red[1] = read[1];
                    green[0] = read[2];
                    green[1] = read[3];
                    blue[0] = read[4];
                    blue[1] = read[5];
                    see = 1;
                    break;
                }
                else
                {
                    printf("\nThe line %s contains invalid characters.", copy);
                    see = 0;
                    break;

                }
            }

            red[2] = '\0';
            green[2] = '\0';
            blue[2] = '\0';

            if(see == 1)
            {
                red_int = (int)strtol(red, NULL, 16);
                green_int = (int)strtol(green, NULL, 16);
                blue_int = (int)strtol(blue, NULL, 16);

                fprintf(output, "RGB code of the hexadecimal code %s is: %i %i %i.\n", copy, red_int, green_int, blue_int);
            }
        }
    printf("\n\nThe number of occupied lines is: %i", CountLines);
    printf("\n\nThe number of valid lines is: %i", ValidLines);
}