//Programmer : MustafaJF@Aol.com
#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdlib>

using namespace std;

void menu();
void getTime();
void clrscr();
void setFileNames();
//****************آرایه دو بعدی برای ذخیره نام فایلها
char fileNames[1024][4];
long start, end, buffer, fileSize, oldFileSize = 1024000;

class file
{
    char str[1025];
    long bytes;
    public:
        file();
        ~file();
        void setStr(char chr);
        void makeFile(char *fileName, int buffer, long fileSize);
        void readFile(char *fileName, int buffer, long fileSize, bool writeDevided);
        void delFile ();
}File;

file::file()
{
    setStr('a');
    makeFile("Text.txt",1024,102400);
}

file::~file()
{
    remove("Text.txt");
}

void file::setStr(char chr)
{
for (int i = 0; i <= 1023; i++)
    str[i] = chr;
}

void file::makeFile(char *fileName, int buffer, long fileSize)
{
    ofstream out(fileName, ios::out | ios::binary);
    long aaa = 0;
    bytes = fileSize * 1024 / buffer;
    while (aaa < bytes)
    {
        out.write(str, buffer);
        aaa ++;
    }
    out.close();
}

void file::readFile(char *fileName, int buffer, long fileSize, bool wr)
{
    ifstream in(fileName, ios::in | ios::binary);
    int a;
    ofstream out;
        File.delFile();
    for (int i = 0; i < 102400 / fileSize; i++)
    {
        if (wr)
            out.open((char*)fileNames[i], ios::out | ios::binary);
        for (int j = 0; j < ((102400 / (102400 / fileSize)) * 1024) / buffer; j++)
        {
            in.read(str, buffer);
            if (wr)
                out.write(str, buffer);
        }
        out.close();
    }
    in.close();
    oldFileSize = fileSize;
}

void file::delFile ()
{
    for (int i = 0; i < 102400 / oldFileSize; i++)
        remove((char*)fileNames[i]);
}

int main (int argc,char *argv[])
{
    setFileNames();
    menu();
    return 0;
}

void menu()
{
    int choice;
    cout << "\n ( 1 ) - Set the size of buffer" << "\n ( 2 ) - Set the size of File" << "\n ( 3 ) - Create File(s)" << "\n ( 4 ) - Read File(s)" << "\n ( 5 ) - Exit" << "\n" ;
    cout << "\n Enter the number (1 to 5) : ";
    cin >> choice;
    switch (choice)
    {
        case 1:
            clrscr();
            cout << "\n  - Enter the size of buffer (under 1024) : ";
            cin >> buffer;
            menu();
            break;
        case 2:
            clrscr();
            cout << "\n (Sizes [100-MB ; 10-MB ; 1-MB ; 100-KB] are recomended) for 100MB enter 102400 \n  - Enter the size of File in KB : ";
            cin >> fileSize;
            menu();
            break;
        case 3:
            clrscr();
            if (buffer <= 0)
                cout << "Set the buffer`s size \n";
            else if (fileSize <= 0)
                cout << "Set the File`s size \n";
            else
            {
                File.readFile("Text.txt", buffer,fileSize, true);
                getTime();
            }
            menu();
            break;
        case 4:
            clrscr();
            if (buffer <= 0)
                cout << "Set the buffer`s size \n";
            else if (fileSize <= 0)
                cout << "Set the File`s size \n";
            else
            {
                File.readFile("Text.txt", buffer,fileSize, false);
                getTime();
            }
            menu();
            break;
        case 5:
            File.delFile();
            exit(1);
        default:
            menu();
    }
}

//*******************تابع تعیین زمان سپری شده برای انجام هر عملیات
void getTime()
{
    long miliSecond, seconds, minutes, timer;
    start = end;
    end = clock() / 1000;
    timer = difftime (end, start);
    miliSecond = timer % 1000;
    seconds = timer / 1000 % 60;
    minutes = timer / 60000;
    cout << endl << minutes << " Minutes " << seconds << " Seconds " << miliSecond << " Mili Seconds " <<  endl;
}

//********************تابع برای ایجاد یکدسته فایل برای تقسیم کردن فایل بزرگتر به فایلهای کوچکتر
void setFileNames()
{
    int aaa = 0;
    for(int i = 97; i <= 122; i++)
        for(int j = 97; j <= 122; j++)
            for(int k = 97; k <= 122; k++)
            {
                if (aaa == 1024)
                    break;
                fileNames[aaa][0] = (char)i;
                fileNames[aaa][1] = (char)j;
                fileNames[aaa][2] = (char)k;
                aaa++;
            }
}

void clrscr()
{
    for (int i = 0; i < 60; i++)
        cout << endl;
}