#include "MainWindow.h"

MainWindow::MainWindow(HINSTANCE& g_hInstance, int g_nCmdShow)
    :hInstance(g_hInstance), nCmdShow(g_nCmdShow) {}

MainWindow::~MainWindow()
{
}

BOOL MainWindow::init()
{
    return !initAppClass() || !initWindow();
}

BOOL MainWindow::initAppClass()
{
    ATOM class_id;
    WNDCLASS wc;
    memset(&wc, 0, sizeof(wc));
    wc.lpszMenuName = NULL;
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = static_cast<WNDPROC> (wndProc);
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = static_cast<HBRUSH> (GetStockObject(WHITE_BRUSH));
    wc.lpszClassName = L"LabWork1";
    class_id = RegisterClass(&wc);

    if (class_id != 0)
        return TRUE;

    return FALSE;
}

BOOL MainWindow::initWindow()
{
    mainWind = CreateWindow(L"LabWork1", L"Лабораторная работа №1",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, NULL,
        400, 400,
        NULL,
        NULL,
        hInstance,
        nullptr);

    if (!hInstance)
        return FALSE;

    ShowWindow(mainWind, nCmdShow);
    UpdateWindow(mainWind);
    startMessageLoop();

    return TRUE;
}

WPARAM MainWindow::startMessageLoop()
{
    MSG msg = MSG();

    while (GetMessage(&msg, 0, 0, 0))
        DispatchMessage(&msg);

    return msg.wParam;
}

LRESULT CALLBACK MainWindow::wndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    case WM_PAINT:
        PAINTSTRUCT ps;
        HDC hDC = BeginPaint(hWnd, &ps);
        ball.draw(hDC);
        EndPaint(hWnd, &ps);
        return 0;
    }

    return DefWindowProc(hWnd, msg, wParam, lParam);
}