/* main.c */

#include <stdio.h>
#include <ctype.h>

#define SIZEB 3
#define CBLOCKOUTPUT 4

struct storage {
    char currentCh;
    char hyphen;
    char additionalSymb;
    char lastCh;
    unsigned int hyphenStatus, lastChStatus, additionalSymbStatus, status;
} symb;

void resetCh(void);
void addCh(char *ch);
int writeGroup(char *ptrSym, char *ptrSym2, char *ptrSym3);

int main(void) {
    symb.additionalSymbStatus = symb.hyphenStatus = symb.lastChStatus = symb.status = 0;
    FILE *fp;
    if((fp = fopen("referat.txt","r"))==NULL) {
        printf("Can't open file!\n");
        return -1;
    }
    char buffer[SIZEB], ch;
    char *buff = buffer;
    int i;
    do {
        for(i=0;i<SIZEB;++i) {
            ch = getc(fp);
            if(feof(fp)) {
                *(buff+i) = '\0';
                break;
            } else
                *(buff+i) = ch;
        }
        for(i=0;i<SIZEB;++i) {
            if(isalpha(*(buff)) && *(buff+1)=='-' && isalpha(*(buff+2))) {
                printf("%c %c %c\n", *buff, *(buff+1), *(buff+2));
                if(writeGroup(buff, (buff+1), (buff+2))) printf("Error writeGroup call point\n");
                resetCh();
                break;
            }
            if(symb.status) {
                if(symb.lastChStatus) {
                    if(*buff == '-') {
                        if(isalpha(*(buff+1))) {
                            printf("%c %c %c\n",symb.lastCh, *buff, *(buff+1));
                            if(writeGroup(&symb.lastCh, buff, (buff+1))) printf("Error writeGroup call point\n");
                            resetCh();
                            break;
                        }
                    }
                }
                if(symb.hyphenStatus) {
                    if(symb.additionalSymbStatus) {
                        if(isalpha(*(buff))) {
                            printf("%c %c %c\n", symb.additionalSymb, symb.hyphen, *buff);
                            if(writeGroup(&symb.additionalSymb, &symb.hyphen, buff))  printf("Error writeGroup call point\n");
                            resetCh();
                            break;
                        }
                    }
                }
            }
        }
            addCh(buff);
    } while(!feof(fp));
fclose(fp);
return 0;
}

int writeGroup(char *ptrSym, char *ptrSym2, char *ptrSym3) {
    FILE *fpwrite;
    char *ptrArr[3] = {ptrSym, ptrSym2, ptrSym3};
    char str1[5];
    int i;
    for(i=0;i<3;++i) {
        str1[i] = *ptrArr[i];
    }
    str1[3] = '\n';
    str1[4] = '\0';
    if((fpwrite = fopen("output.txt","a"))==NULL) {
        printf("Error open file for writing!\n");
        return -1;
    }
    if(fwrite(str1, sizeof(char), CBLOCKOUTPUT, fpwrite)!=CBLOCKOUTPUT) {
            printf("End write\n");
            fclose(fpwrite);
            return -1;
        }
    fclose(fpwrite);
    return 0;
}

void resetCh(void) {
    symb.additionalSymbStatus = symb.hyphenStatus = symb.lastChStatus = symb.status = 0;
}
void addCh(char *buff) {
    if(*(buff+(SIZEB-1))=='-') {
        symb.hyphen = *(buff+(SIZEB-1));
        if(isalpha(*(buff+(SIZEB-2)))) {
            symb.additionalSymb = *(buff+((SIZEB-2)));
            symb.additionalSymbStatus = 1;
            symb.hyphenStatus = 1;
            symb.lastChStatus = 0;
            symb.status = 1;
        }
        else
            symb.additionalSymbStatus = 0;
    }
    if(isalpha(*(buff+(SIZEB-1)))) {
        symb.lastCh = *(buff+(SIZEB-1));
        symb.hyphenStatus = 0;
        symb.lastChStatus = 1;
        symb.status = 1;
    }
}