// DINSTRING.H

#ifndef DINSTRING_H_INCLUDED
#define DINSTRING_H_INCLUDED

#include <iostream>
using namespace std;

class DinString
{
    private:
        int duzina;
        char *text;

    public:
        DinString();
        DinString(const char[]);
        DinString(const DinString&);
        ~DinString();

        int length() const;
        char& operator[](int);
        char operator[](int) const;
        DinString& operator=(const DinString&);
        DinString& operator+=(const DinString&);
        friend bool operator==(const DinString&, const DinString&);
        friend bool operator!=(const DinString&, const DinString&);
        friend DinString operator+(const DinString&, const DinString&);
        friend ostream& operator<<(ostream&, const DinString&);

};


#endif // DINSTRING_H_INCLUDED

// DINSTRING.CPP
#include "dinstring.h"

DinString :: DinString()
{
    duzina = 0;
    text = NULL;
}

DinString :: DinString(const char ulazniStr[])
{
    duzina = 0;
    while (ulazniStr[duzina] != '\0')
        duzina++;

    text = new char[duzina+1];
    for (int i = 0; i < duzina; i++)
        text[i] = ulazniStr[i];

    text[duzina] = '\0';
}

DinString :: DinString(const DinString &ds)
{
    duzina = ds.duzina;
    text = new char[duzina+1];
    for (int i = 0; i < duzina; i++)
        text[i] = ds.text[i];

    text[duzina] = '\0';
}

DinString :: ~DinString()
{
    delete[] text;
   // delete text;
}

int DinString :: length() const
{
    return duzina;
}

char& DinString :: operator[](int i)
{
    return text[i];
}

char DinString :: operator[](int i) const
{
    return text[i];
}

DinString& DinString :: operator=(const DinString &ds)
{
    if (this != &ds) // MIND = BLOWN! DAFUQ?
    {
        delete[] text;
        duzina = ds.duzina;
        text = new char[duzina+1];
        for (int i = 0; i < duzina; i++)
            text[i] = ds.text[i];
        text[duzina] = '\0';
    }
    return *this;
}

DinString& DinString :: operator+=(const DinString &ds)
{
    char *tempText = new char[duzina+ds.duzina+1];

    for (int i = 0; i < duzina; i++)
        tempText[i] = text[i];

    for (int i = 0; i < ds.duzina; i++)
        tempText[duzina+i] = ds.text[i];

    tempText[duzina+ds.duzina] = '\0';
    duzina+=ds.duzina;

    delete[] text;
    text = tempText;

    return *this;
}

bool operator==(const DinString &ds1, const DinString &ds2)
{
    if (ds1.duzina != ds2.duzina)
        return false;

    for (int i = 0; i < ds1.duzina; i++)
        if (ds1.text[i] != ds2.text[i])
            return false;

    return true;
}

bool operator!=(const DinString &ds1, const DinString &ds2)
{
    if (ds1.duzina != ds2.duzina)
        return true;

    for (int i = 0; i < ds1.duzina; i++)
        if (ds1.text[i] != ds2.text[i])
            return true;

    return false;
}

DinString operator+(const DinString &ds1, const DinString &ds2)
{
    int i;
    DinString temp;
    temp.duzina = ds1.duzina+ds2.duzina;
    temp.text = new char[temp.duzina+1];

    for (i = 0; i < ds1.duzina; i++)
        temp.text[i] = ds1.text[i];

    for (int j = 0; j < ds2.duzina; j++)
        temp.text[i+j] = ds2.text[j];

    temp.text[temp.duzina] = '\0';

    return temp;
}

ostream& operator<<(ostream &out, const DinString &ds)
{
    if (ds.duzina > 0)
        out << ds.text;

    return out;
}

// MAIN.CPP
#include <iostream>
#include "dinstring.h"

using namespace std;

int main()
{
    DinString a, b("Dobar"), c("dan");
    cout << "a " << a << endl;
    cout << "b " << b << endl;
    cout << "c " << c << endl;

    cout << endl << "Testiranje +=" << endl;
    cout << "a+=b: " << (a+=b) << endl;
    cout << "a+=c: " << (a+=c) << endl;
    cout << endl << "Testiranje +" << endl;
    cout << "a=b+c: " << (a=b+c) << endl;
    cout << "a=b+\" \"+c: " << (a=b+" "+c) << endl;
    cout << endl << "Testiranje []" << endl;
    char x=a[5];
    cout << "x=a[5] x: " << x << endl;
    a[5] = 'Z';
    cout << "Izvrseno a[5] = 'Z', sada je a: " << a << endl;
    cout << endl << "Testiranje ==, = i !=" << endl;
    cout << "a: " << a << endl;
    cout << "b: " << b << endl;
    cout << "a==b? " << (a==b) << endl;
    cout << "a!=b? " << (a!=b) << endl;
    a=b;
    cout << "a: " << a << endl;
    cout << "b: " << b << endl;
    cout << "a==b? " << (a==b) << endl;
    cout << "a!=b? " << (a!=b) << endl;
    cout << endl << "Ocitavanje duzine stringa pomocu length" << endl;
    cout << "a: " << a << endl;
    cout << "Duzina strina a: " << a.length() << endl;
    a = (a+=(" "+b))+" "+c;
    cout << "a: " << a << endl;
    cout << "Duzina stringa a: " << a.length() << endl;

    return 0;


}