// PROG.1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <fstream>
#include <iostream>

struct data
{
    int type;
    char marker;
    int lenght;
    int _len;
    char array[1024];
};

void insert(data &_data, int index, char sym)
{
    char _old = _data.array[index];
    _data.array[index] = sym;
    for (int j = index; j < _countof(_data.array) - 1; j++)
    {
        char _new = _data.array[j + 1];
        _data.array[j + 1] = _old;
        _old = _new;
    }
}

void del(data &_data, int index, char sym)
{
    while (_data.array[index + 1] == sym)
    {
        for (int i = index + 1; i < _countof(_data.array) - 2; i++)
        {
            _data.array[i] = _data.array[i + 1];
        }
        _data.lenght--;
    }
}

bool mode_lenght_def(data &_data, std::ifstream &in)
{
    if (sscanf_s(_data.array, "%d %n", &_data.lenght, &_data._len) != 1)
    {
        char error[] = "Incorrect format";
        strcpy_s(_data.array, error);
        _data.lenght = _countof(error) - 1;
        _data._len = 0;
        return false;
    }
    _data.lenght = _data.lenght + _data._len;
    for (int i = _data._len; i < _data.lenght; i++)
    {
        char sym = '.';
        if (_data.array[i] == sym)
            del(_data, i, sym);
    }
    return true;
}

bool mode_lenght_mark(data &_data, std::ifstream &in)
{
    if (sscanf_s(_data.array, "%d %n", &_data.lenght, &_data._len) != 1)
    {
        char error[] = "Incorrect format";
        strcpy_s(_data.array, error);
        _data.lenght = _countof(error) - 1;
        _data._len = 0;
        return false;
    }
    _data.marker = '❤';
    _data.lenght = _data.lenght + _data._len;
    insert(_data, _data.lenght, _data.marker);
    int i = _data._len - 1;
    while (_data.array[i++] != _data.marker)
    {
        char sym = '.';
        if (_data.array[i] == sym)
            del(_data, i, sym);
    }
    return true;
}

bool mode_marker_def(data &_data, std::ifstream &in)
{
    _data._len = 1;
    _data.marker = _data.array[0];
    for (int i = _data._len; i < _countof(_data.array) - 1; i++)
    {
        if (_data.array[i + 1] == _data.marker)
        {
            _data.lenght = i;
        }
    }
    if (_data.lenght == -1)
    {
        char error[] = "Missing closing quote";
        strcpy_s(_data.array, error);
        _data.lenght = _countof(error) - 1;
        _data._len = 0;
        return false;
    }

    _data.lenght = _data.lenght + _data._len;
    for (int i = _data._len; i < _data.lenght; i++)
    {
        char sym = '.';
        if (_data.array[i] == sym)
            del(_data, i, sym);
    }
    return true;
}

bool mode_marker_mark(data &_data, std::ifstream &in)
{
    _data._len = 1;
    _data.marker = _data.array[0];
    for (int i = _data._len; i < _countof(_data.array) - 1; i++)
    {
        if (_data.array[i + 1] == _data.marker)
        {
            _data.lenght = i;
        }
    }

    if (_data.lenght == -1)
    {
        char error[] = "Missing closing quote";
        strcpy_s(_data.array, error);
        _data.lenght = _countof(error) - 1;
        _data._len = 0;
        return false;
    }

    _data.marker = '❤';
    _data.lenght = _data.lenght + _data._len;
    insert(_data, _data.lenght, _data.marker);
    int i = _data._len - 1;
    while (_data.array[i++] != _data.marker)
    {
        char sym = '.';
        if (_data.array[i] == sym)
            del(_data, i, sym);
    }
    return true;
}

void print(data &_data, std::ofstream &out)
{
    out << "Result for [" << _data.type << "] type : ";
    switch (_data.type)
    {
    case 1:
    case 3:
        for (int i = _data._len; i < _data.lenght && _data.array[i] != '\0'; i++)
            out << _data.array[i];
        break;
    case 2:
    case 4:
        int i = _data._len;
        while (_data.array[i] != _data.marker && i < _data.lenght && _data.array[i] != '\0')
        {
            out << _data.array[i++];
        }
        break;
    }
    out << "\n";
}

int main()
{
    std::ifstream input("input.txt");
    std::ofstream output("output.txt");

    if (!input || !output) {
        std::cout << "Unable to work with files";
        system("pause");
        return 0;
    }

    while (!input.eof())
    {
        data _data = data();
        _data.lenght = -1;
        std::cout << "Enter type : ";
        std::cin >> _data.type;

        input.getline(_data.array, _countof(_data.array));
        switch (_data.type)
        {
        case 1://длинна
            mode_lenght_def(_data, input);
            break;
        case 2://длина маркер
            mode_lenght_mark(_data, input);
            break;
        case 3://кавычки длина
            mode_marker_def(_data, input);
            break;
        case 4://кавычки маркер
            mode_marker_mark(_data, input);
            break;
        }
        print(_data, output);
    }
    system("pause");
    return 0;
}