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

int Pntr = 0;
const char D1[4] = "([{";
const char D2[4] = ")]}";

void Push (char *MassStack, char Ch ) {
    MassStack[Pntr] = Ch;
    Pntr++;
}

char Pop (char *MassStack) {
    Pntr--;
    if (Pntr > -1) {
        return (MassStack[Pntr]);
    }
    else {
        return ('0');
    }
}

char OpenBracket(char Ch) {
    switch (Ch) {
        case (')'): return('(');
        case (']'): return('[');
        case ('}'): return ('{');
        default: return ('0');
    }
}

bool Proc (char *StrSrc) {
    int i = 0;
    Pntr = 0;
    char MassStack [100];
    bool Balance = true;
    while ((i < strlen(StrSrc)) && Balance) {
        if (strchr(D1, StrSrc[i]) != NULL) {
            Push(MassStack, StrSrc[i]);
        }
        else {
            if (strchr(D2, StrSrc[i]) != NULL) {
                if (Pop(MassStack) != OpenBracket(StrSrc[i])) {
                    Balance = false;
                }
            }
        }
        i++;
    }
    return((Pntr == 0) && Balance);
}

bool IsStrCorrect(char *StrSrc) {
    const char D[7] = "([{)]}";
    bool isCorrect = false;
    for (int i = 0; i <  strlen(StrSrc); i++) {
        if (strchr(D, StrSrc[i]) != NULL) {
            isCorrect = true;
        }
    }
    return (isCorrect);
}

char *FileNameInputRead () {
    bool isCorrect = true;
    char *FileName;
    do {
        puts("Enter file name:");
        FileName = (char*)malloc(255);
        gets(FileName);
        if (fopen(FileName, "r") == NULL) {
            puts("This file does not exist!");
        }
        else{
            isCorrect = false;
        }
    }
    while (isCorrect);
    return(FileName);
}

void IsBracketCorrect() {
    char *FileNameIn;
    FileNameIn = FileNameInputRead();
    FILE *FileIn = fopen(FileNameIn, "r");
    char StrSrc[255];
    while (fgets(StrSrc, 255, FileIn)) {
        printf("%s", StrSrc);
        if (IsStrCorrect(StrSrc)) {
            if (Proc(StrSrc)) {
                puts("Brackets agreed.");
            }
            else {
                puts("Brackets are not agreed.");
            }
        }
        else {
            puts("There are no brackets in the line!");
        }
    }
}

int main() {
    printf("This program will check the balance of the brackets in the lines\n");
    IsBracketCorrect();
    return 0;
}