#include <Windows.h>
#include <iostream>
#include <cstdlib>
#include <fstream>
#include <cstring>
#include <stdio.h>

using namespace std;



LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

HWND btn1, btn2, childWnd, childWnd1, childWnd2, childWnd3, Click, hMainWnd, childWnd4, childWnd5, childWndst3, childWndst2, childWndst1, childWndst4;

int selected_mark = 0;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    MSG msg;
    WNDCLASSEX wc;

    char szClassName[] = "AppClass";
    wc.cbSize = sizeof(wc);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = szClassName;
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    /*****************************************************************************************************************************/
    if (!RegisterClassEx(&wc)) {
        MessageBox(NULL, "Не удалось зарегистрировать класс окна", "Ошибка", MB_OK);
        return 0;
    }

    hMainWnd = CreateWindow(szClassName, "Программа работа(21)", WS_SYSMENU | WS_MINIMIZEBOX, 400, 200, 300, 300, NULL, NULL, hInstance, NULL);

    if (!hMainWnd) {
        MessageBox(NULL, "Не удалось создать главное окно программы", "Ошибка", MB_OK);
        return 0;
    }
    ShowWindow(hMainWnd, nCmdShow);


    /*Функция GetMessage возвращает FALSE, если получит сообщение WM_QUIT. Во всех остальных случаях она вернёт TRUE.*/
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}


LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{



    switch (uMsg) {
    case WM_CREATE: {

        childWnd = CreateWindow("BUTTON", "Сохранить", WS_VISIBLE | WS_CHILD | BS_PUSHLIKE, 65, 209, 150, 30, hWnd, NULL, (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE), NULL);

        childWnd1 = CreateWindow("edit", NULL, WS_VISIBLE | WS_CHILD | WS_BORDER, 122, 16, 150, 30, hWnd, NULL, NULL, NULL);

        childWnd2 = CreateWindow("edit", NULL, WS_VISIBLE | WS_CHILD | WS_BORDER, 122, 61, 150, 30, hWnd, NULL, NULL, NULL);

        childWnd3 = CreateWindow("edit", NULL, WS_VISIBLE | WS_VISIBLE | WS_CHILD | WS_BORDER, 122, 108, 150, 30, hWnd, NULL, NULL, NULL);

        childWnd4 = CreateWindow("LISTBOX", NULL, WS_VISIBLE | WS_CHILD | WS_BORDER, 122, 147, 125, 60, hWnd, NULL, NULL, NULL);

        btn1 = CreateWindow("BUTTON", "/\\", WS_VISIBLE | WS_CHILD | BS_PUSHLIKE, 250, 147, 30, 30, hWnd, NULL, (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE), NULL);
        btn2 = CreateWindow("BUTTON", "\\/", WS_VISIBLE | WS_CHILD | BS_PUSHLIKE, 250, 180, 30, 30, hWnd, NULL, (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE), NULL);

        childWndst1 = CreateWindow("static", "Фамилия", WS_VISIBLE | WS_CHILD | SS_SIMPLE, 20, 16, 70, 30, hWnd, NULL, NULL, NULL);

        childWndst2 = CreateWindow("static", "Имя", WS_VISIBLE | WS_CHILD | SS_SIMPLE, 20, 61, 70, 30, hWnd, NULL, NULL, NULL);

        childWndst3 = CreateWindow("static", "Отчество", WS_VISIBLE | WS_CHILD | SS_SIMPLE, 20, 108, 70, 30, hWnd, NULL, NULL, NULL);

        childWndst4 = CreateWindow("static", "Оценка", WS_VISIBLE | WS_CHILD | SS_SIMPLE, 20, 147, 70, 30, hWnd, NULL, NULL, NULL);
        for (int i = 1; i < 11; i++) {
            char buf[20];
            _itoa_s(i, buf, 10);
            SendMessage(childWnd4, LB_ADDSTRING, 0, LPARAM(buf));
        }
        SendMessage(childWnd4, LB_SETCURSEL, (LPARAM)selected_mark, true);
        EnableWindow(childWnd, FALSE);
        break;
    }

    case WM_COMMAND: {
        if ((HWND)lParam == btn1) {
            if (selected_mark - 1 < 0) break;
            selected_mark--;
            SendMessage(childWnd4, LB_SETCURSEL, (LPARAM)selected_mark, true);  //Изменяем позицию листбокс
        }
        else if ((HWND)lParam == btn2) {
            if (selected_mark - 1 > 9) break;
            selected_mark++;
            SendMessage(childWnd4, LB_SETCURSEL, (LPARAM)selected_mark, true); // Изменяем позицию листбокс
        }
        else if ((HWND)lParam == childWnd) {
            char bufa[20];
            char buffer[200];

            _itoa_s(selected_mark + 1, bufa, 10);
            ofstream f("list.txt", ios_base::app);
            char* buff = new char[1024];
            GetWindowText(childWnd1, buff, 100);
            f << buff << " ";

            GetWindowText(childWnd2, buff, 100);
            f << buff << " ";

            GetWindowText(childWnd3, buff, 100);
            f << buff << " ";

            f << bufa << "\n";
            delete buff;

            f.close();

            //MessageBox(NULL, buffer, buffer, 0);
        }
        EnableWindow(childWnd, FALSE);
        char buff[100];
        GetWindowText(childWnd1, buff, 100);
        if (strlen(buff) < 1) break;

        GetWindowText(childWnd2, buff, 100);
        if (strlen(buff) < 1) break;

        GetWindowText(childWnd3, buff, 100);
        if (strlen(buff) < 1) break;

        EnableWindow(childWnd, TRUE);
        break;
    }
    case WM_KEYUP: {


        break;
    }


    case WM_CLOSE: {
        DestroyWindow(hWnd);    //посылает окну сообщение WM_DESTROY, после которого окна на экране уже нет
        break;
    }
    case WM_DESTROY: {
        PostQuitMessage(0);     //посылает сообщение WM_QUIT, после которого прекращается цикл обработки сообщений
        break;
    }
    default: {
        return DefWindowProc(hWnd, uMsg, wParam, lParam); //обработка сообщений по умолчанию
    }
    }

    return 0;
}