//      Пусть в файле храняться строки, представляющие собой
//      исходный код программы на языке с++. Вывести синтаксически
//      правильные операторы присваивания одной переменной значение
//      другой. Список зарезервированных слов задать в отдельном файле.
//
//  Created by Дмитрий Рябовский on 14/03/2019.
//  Copyright © 2019 Дмитрий Рябовский. All rights reserved.
//

#include <iostream>
#include <fstream>
#include <stdio.h>
#include <string.h>

using namespace std;

enum States {
    State_Start,
    State_Variable,
    State_Assignment,
    State_Complete,
    State_Skip
};


void getStrFromFile (char* str, char* way) {
    ifstream fin(way);
    if (!fin.is_open()) {
        cout << "Файл не найден!\n";
        exit(-1);
    }
    string line;
    char line_char[300] = "";
    int i = 0;
    while (getline(fin, line)) {
        while (line[i] != '\0') {
            line_char[i] = line[i];
            i++;
        }
        strcat(str, " ");
        strcat(str, line_char);
        i = 0;
        while (line_char[i] != '\0') {
            line_char[i] = '\0';
            i++;
        }
        i = 0;
    }
    fin.close();
}


bool checkWord(char* var, char* key_words) {
    bool correct = 1;

    return correct;
}


bool verificationKeyword(char* operation) {
    bool correct = 1;
    char var1[250] = "";
    char var2[250] = "";
    char key_words[500] = "";
    int i = 0;
    bool found_equal = 0;
    getStrFromFile(key_words, "/Users/dmitrijrabovskij/Desktop/C++/labs/5/5/1keywords.txt"); // 1
    //cout << 1 << endl << key_words << endl;

    while (operation[i] != ';') {
        if (operation[i] == '=') {
            found_equal = 1;
        } else {
            char symb[2];
            symb[0] = operation[i];
            if (operation[i] != ' ') {
                if (!found_equal) {
                    strcat(var1, symb);
                } else {
                    strcat(var2, symb);
                }
            }
        }
        i++;
    }
    //cout << var1 << ' ' << var2 << endl;

    correct = (checkWord(var1, key_words) && checkWord(var2, key_words));
    return correct;
}


void assignOperatorSearch(string text) {   //char* text) {
    States state = State_Start;
    char operation[100] = "";

    bool count = 0;
    int current = int(text[0]);
    char symb[2];
    for (int i = 0; current != '\0'; i++) {
        current = int(text[i]);
        symb[0] = text[i];
        strcat(operation, symb);

        switch (state) {

            case State_Start:
                if (current < 57 && current > 48) {
                    state = State_Skip;
                    count = 0;
                } else if ((current <= 122 && current >= 97) || (current <= 90 && current >= 65)
                         || (current == 95)) {
                    state = State_Variable;
                } else {
                    if (current != 32) {
                        count = 0;
                        state = State_Skip;
                    }
                }
                break;


            case State_Variable:
                if ((current == 32) || (cout && (current == 59)) || (!count && current == 61) ) {
                    if (count) {
//cout << "\n +++   " << text[i] << " " << i<< "\n";
                        verificationKeyword(operation);
                        cout << operation << endl;
                        count = 0;
                        state = State_Start;
                    } else {
                        if (current == 61) {
                            state = State_Start;
                            count = 1;
                        } else {
                            state = State_Assignment;
                        }
                    }
                } else if ((current > 122 || current < 97) && (current > 90 || current < 65)
                         && (current > 57 || current < 48) && (current != 95)) {                // a-z 97-122   A-Z 65-90   0-9 48-57     _ 95
                    state = State_Skip;
                }
                break;


            case State_Assignment:
                if (current == 32) {

                } else if (current == 61) {           // =
                    state = State_Start;
                    count = 1;
                } else {
                    i = i - 2;
                    state = State_Skip;
                }
                break;


            case State_Complete:
                if (current == 32) {
                } else if (current == 59) {           // ;
//cout << "\n +++ \n";
                    verificationKeyword(operation);
                    cout << operation << endl;
                } else {
                    state = State_Skip;
                }
                break;


            case State_Skip:
                operation[0] = '\0';                    //  !!!  !!!   !!!   !!!   !!!   !!!
                if (current == 32 || current == 59) {
                    state = State_Start;
                }
                break;
        }
    }
}


int main() {

    char str_cin[9999] = "";
    getStrFromFile(str_cin, "/Users/dmitrijrabovskij/Desktop/C++/labs/5/5/cin.txt");
    //cout << str_cin;

    assignOperatorSearch(str_cin);
    return 0;
}