// WinAPI.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "WinAPI.h"
#include <string>
#include <sstream>

#define MAX_LOADSTRING 100

using namespace std;

#ifdef UNICODE
typedef std::wostringstream tstringstream;
#else
typedef std::ostringstream tstringstream;
#endif

// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

                                                // Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
    _In_opt_ HINSTANCE hPrevInstance,
    _In_ LPWSTR    lpCmdLine,
    _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    // TODO: Place code here.


    // Initialize global strings
    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadStringW(hInstance, IDC_WINAPI, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance(hInstance, nCmdShow))
    {
        return FALSE;
    }

    HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINAPI));

    MSG msg;

    // Main message loop:
    while (GetMessage(&msg, nullptr, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int)msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEXW wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINAPI));
    wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_WINAPI);
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassExW(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    hInst = hInstance; // Store instance handle in our global variable

    HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

    if (!hWnd)
    {
        return FALSE;
    }

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    return TRUE;
}

int w_left = 100;
int w_right = 200;
int w_top = 100;
int w_bottom = 200;

bool collision = false;
POINT coordinates;
SYSTEMTIME previousTime;

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_COMMAND:
    {
        int wmId = LOWORD(wParam);
        // Parse the menu selections:
        switch (wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
    }
    break;
    case WM_PAINT:
    {
        // TODO: Add any drawing code that uses hdc here...
        PAINTSTRUCT ps;
        HDC hDC = BeginPaint(hWnd, &ps);
        HPEN hpenOld = static_cast<HPEN>(SelectObject(hDC, GetStockObject(DC_PEN)));
        HBRUSH hbrushOld = static_cast<HBRUSH>(SelectObject(hDC, GetStockObject(NULL_BRUSH)));

        // Calculate the dimensions of the 4 equal rectangles.
        RECT rcWindow;
        GetClientRect(hWnd, &rcWindow);

        // Draw (differently-colored) borders around these rectangles.
        if (collision)
        {
            SetDCPenColor(hDC, RGB(255, 0, 0));
        }
        else
        {
            SetDCPenColor(hDC, RGB(0, 0, 0));
        }

        Rectangle(hDC, w_left, w_top, w_right, w_bottom);

        tstringstream posX;
        posX << coordinates.x;

        tstringstream posY;
        posY << coordinates.y;

        std::string space = ", ";
        std::wstring wsSpace(space.begin(), space.end());

        std::wstring stringPosX = posX.str();
        std::wstring stringPosY = posY.str();
        stringPosX.append(wsSpace);
        stringPosX.append(stringPosY);

        DrawText(hDC, stringPosX.c_str(), -1, &rcWindow, DT_TOP | DT_SINGLELINE | DT_LEFT);

        // Draw the text into the center of each of the rectangles.
        SetBkMode(hDC, TRANSPARENT);
        SetBkColor(hDC, RGB(0, 0, 0));

        // Clean up after ourselves.
        SelectObject(hDC, hpenOld);
        SelectObject(hDC, hbrushOld);
        EndPaint(hWnd, &ps);
    }
    break;
    case WM_MOUSEMOVE:
        GetCursorPos(&coordinates);
        ScreenToClient(hWnd, &coordinates);

        if (coordinates.x >= w_left && coordinates.x <= w_right && coordinates.y >= w_top && coordinates.y <= w_bottom)
        {
            if (!collision)
            {
                SetTimer(hWnd, 15, 5000, (TIMERPROC)NULL);
            }

            collision = true;
        }
        else
        {
            KillTimer(hWnd, 15);
            collision = false;
        }

        RedrawWindow(hWnd, NULL, NULL, RDW_INVALIDATE | RDW_INTERNALPAINT);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    case WM_TIMER:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

VOID CALLBACK MyTimerProc(
    HWND hwnd,        // handle to window for timer messages
    UINT message,     // WM_TIMER message
    UINT idTimer,     // timer identifier
    DWORD dwTime)     // current system time
{
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}