/*
    Copyright 2005-2011 Intel Corporation.  All Rights Reserved.

    This file is part of Threading Building Blocks.

    Threading Building Blocks is free software; you can redistribute it
    and/or modify it under the terms of the GNU General Public License
    version 2 as published by the Free Software Foundation.

    Threading Building Blocks is distributed in the hope that it will be
    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Threading Building Blocks; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    As a special exception, you may use this file as part of a free software
    library without restriction.  Specifically, if other files instantiate
    templates or use macros or inline functions from this file, or you compile
    this file and link it with other files to produce an executable, this
    file does not by itself cause the resulting executable to be covered by
    the GNU General Public License.  This exception does not however
    invalidate any other reasons why the executable file might be covered by
    the GNU General Public License.
*/

// common Windows parts
#include "winvideo.h"
// include GDI+ headers
#include <gdiplus.h>
// and another headers
#include <stdio.h>

// tag linking library
#pragma comment(lib, "gdiplus.lib")

// global specific variables
Gdiplus::Bitmap *           g_pBitmap;           // main drawing bitmap
ULONG_PTR                   gdiplusToken;
Gdiplus::GdiplusStartupInput gdiplusStartupInput;// GDI+

//! display system error
bool DisplayError(LPSTR lpstrErr, HRESULT hres)
{
    static bool InError = false;
    int retval = 0;
    if (!InError)
    {
        InError = true;
        LPCSTR lpMsgBuf;
        if(!hres) hres = GetLastError();
        FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
                               NULL, hres, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpMsgBuf, 0, NULL );
        retval = MessageBox(g_hAppWnd, lpstrErr, lpMsgBuf, MB_OK|MB_ICONERROR);
        LocalFree( (HLOCAL)lpMsgBuf );
        InError = false;
    }
    return false;
}

//! Win event processing function
LRESULT CALLBACK InternalWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    switch (iMsg)
    {
        case WM_MOVE:
            // Check to make sure our window exists before we tell it to repaint.
            // This will fail the first time (while the window is being created).
            if (hwnd) {
                InvalidateRect(hwnd, NULL, FALSE);
                UpdateWindow(hwnd);
            }
            return 0L;

        case WM_PAINT:
            {
                PAINTSTRUCT ps;
                Gdiplus::Graphics graphics( BeginPaint(hwnd, &ps) );
                // redraw just requested area. This call is as fast as simple DrawImage() call.
                if(g_video->updating) graphics.DrawImage(g_pBitmap, ps.rcPaint.left, ps.rcPaint.top, ps.rcPaint.left, ps.rcPaint.top,
                                    ps.rcPaint.right, ps.rcPaint.bottom, Gdiplus::UnitPixel);
                EndPaint(hwnd, &ps);
            }
            return 0L;

        // Proccess all mouse and keyboard events
        case WM_LBUTTONDOWN:    g_video->on_mouse( (int)LOWORD(lParam), (int)HIWORD(lParam), 1); break;
        case WM_LBUTTONUP:      g_video->on_mouse( (int)LOWORD(lParam), (int)HIWORD(lParam), -1); break;
        case WM_RBUTTONDOWN:    g_video->on_mouse( (int)LOWORD(lParam), (int)HIWORD(lParam), 2); break;
        case WM_RBUTTONUP:      g_video->on_mouse( (int)LOWORD(lParam), (int)HIWORD(lParam), -2); break;
        case WM_MBUTTONDOWN:    g_video->on_mouse( (int)LOWORD(lParam), (int)HIWORD(lParam), 3); break;
        case WM_MBUTTONUP:      g_video->on_mouse( (int)LOWORD(lParam), (int)HIWORD(lParam), -3); break;
        case WM_CHAR:           g_video->on_key( (int)wParam); break;

        // some useless stuff
        case WM_ERASEBKGND:     return 1;  // keeps erase-background events from happening, reduces chop
        case WM_DISPLAYCHANGE:  return 0;

        // Now, shut down the window...
        case WM_DESTROY:        PostQuitMessage(0); return 0;
    }
    // call user defined proc, if exists
    return g_pUserProc? g_pUserProc(hwnd, iMsg, wParam, lParam) : DefWindowProc(hwnd, iMsg, wParam, lParam);
}

///////////// video functions ////////////////

bool video::init_window(int sizex, int sizey)
{
    assert(win_hInstance != 0);
    g_sizex = sizex; g_sizey = sizey;
    if (!WinInit(win_hInstance, win_iCmdShow, gWndClass, title, true)) {
        DisplayError("Unable to initialize the program's window.");
        return false;
    }
    ShowWindow(g_hAppWnd, SW_SHOW);
    Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
    g_pImg = new unsigned int[sizex*sizey];
    g_pBitmap = new Gdiplus::Bitmap(g_sizex, g_sizey, 4*g_sizex, PixelFormat32bppRGB, (BYTE*)g_pImg );
    running = true;
    return true;
}

void video::terminate()
{
    if(g_pBitmap) { delete g_pBitmap; g_pBitmap = 0; }
    Gdiplus::GdiplusShutdown(gdiplusToken);
    g_video = 0; running = false;
    if(g_pImg) { delete[] g_pImg; g_pImg = 0; }
}

//////////// drawing area constructor & destructor /////////////

drawing_area::drawing_area(int x, int y, int sizex, int sizey)
: start_x(x), start_y(y), size_x(sizex), size_y(sizey), pixel_depth(24),
    base_index(y*g_sizex + x), max_index(g_sizex*g_sizey), index_stride(g_sizex), ptr32(g_pImg)
{
    assert(x < g_sizex); assert(y < g_sizey);
    assert(x+sizex <= g_sizex); assert(y+sizey <= g_sizey);

    index = base_index; // current index
}

void drawing_area::update()
{
    if(g_video->updating) {
        RECT r;
        r.left = start_x; r.right  = start_x + size_x;
        r.top  = start_y; r.bottom = start_y + size_y;
        InvalidateRect(g_hAppWnd, &r, false);
    }
}
