#include "ggl.h"
#include "scene.h"
#pragma comment(lib,"opengl32.lib")
#pragma comment(lib, "glew32.lib")
#pragma comment(lib, "winmm.lib")
unsigned char * LoadFileContent(const char *path, int &filesize) {
	unsigned char*fileContent = nullptr;
	filesize = 0;
	FILE*pFile = fopen(path, "rb");
	if (pFile) {
		fseek(pFile, 0, SEEK_END);
		int nLen = ftell(pFile);
		if (nLen > 0) {
			rewind(pFile);
			fileContent = new unsigned char[nLen + 1];
			fread(fileContent, sizeof(unsigned char), nLen, pFile);
			fileContent[nLen] = '\0';
			filesize = nLen;
		}
		fclose(pFile);
	}
	return fileContent;
}
float GetFrameTime() {
	static unsigned long lastTime = 0, timeSinceComputerStart = 0;
	timeSinceComputerStart = timeGetTime();
	unsigned long frameTime = lastTime == 0 ? 0 : timeSinceComputerStart - lastTime;
	lastTime = timeSinceComputerStart;
	return float(frameTime) / 1000.0f;
}
LRESULT CALLBACK GLWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch (msg)
	{
	case WM_CLOSE:
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hwnd, msg, wParam, lParam);
}
INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	WNDCLASSEX wndclass;
	wndclass.cbClsExtra = 0;
	wndclass.cbSize = sizeof(WNDCLASSEX);
	wndclass.cbWndExtra = 0;
	wndclass.hbrBackground = NULL;
	wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
	wndclass.hIcon = NULL;
	wndclass.hIconSm = NULL;
	wndclass.hInstance = hInstance;
	wndclass.lpfnWndProc = GLWindowProc;
	wndclass.lpszClassName = L"GLWindow";
	wndclass.lpszMenuName = NULL;
	wndclass.style = CS_VREDRAW | CS_HREDRAW;

	ATOM atom = RegisterClassEx(&wndclass);
	if (!atom) {
		MessageBox(NULL, L"Register Fail", L"Error", MB_OK);
		return 0;
	}

	RECT rect;
	rect.left = 0;
	rect.right = 1280;
	rect.top = 0;
	rect.bottom = 720;
	AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, NULL);
	int windowWidth = rect.right - rect.left;
	int windowHeight = rect.bottom - rect.top;

	HWND hwnd = CreateWindowEx(NULL, L"GLWindow", L"OpenGL Window", WS_OVERLAPPEDWINDOW,
		100, 100, windowWidth, windowHeight,
		NULL, NULL, hInstance, NULL);

	HDC dc = GetDC(hwnd);
	PIXELFORMATDESCRIPTOR pfd;
	memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
	pfd.nVersion = 1;
	pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
	pfd.cColorBits = 32;
	pfd.cDepthBits = 24;
	pfd.cStencilBits = 8;
	pfd.iPixelType = PFD_TYPE_RGBA;
	pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
	int pixelFormat = ChoosePixelFormat(dc, &pfd);
	SetPixelFormat(dc, pixelFormat, &pfd);
	
	HGLRC rc = wglCreateContext(dc);
	wglMakeCurrent(dc, rc);

	glewInit();
	Init();
	SetViewPortSize(800.0f, 600.0f);

	ShowWindow(hwnd, SW_SHOW);
	UpdateWindow(hwnd);


	MSG msg;
	while (true)
	{
		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE))
		{
			if (msg.message == WM_QUIT)
			{
				break;
			}
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
		Draw();
		SwapBuffers(dc);
	}
	return 0;
}