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#include <string>

#include <iostream>

#include <windows.h>

#include <shellapi.h>

#include <gl/glew.h>

#include <time.h>

#include "SOIL.h"

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

void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);

void DisableOpenGL(HWND, HDC, HGLRC);

int WINAPI WinMain(HINSTANCE hInstance,

                   HINSTANCE hPrevInstance,

                   LPSTR lpCmdLine,

                   int nCmdShow)

{

    WNDCLASSEX wcex;

    HWND hwnd;

    HDC hDC;

    HGLRC hRC;

    MSG msg;

    BOOL bQuit = FALSE;

    float theta = 0.0f;

    // register window class

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style = CS_OWNDC;

    wcex.lpfnWndProc = WindowProc;

    wcex.cbClsExtra = 0;

    wcex.cbWndExtra = 0;

    wcex.hInstance = hInstance;

    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);

    wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);

    wcex.lpszMenuName = NULL;

    wcex.lpszClassName = "GLSample";

    wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    if (!RegisterClassEx(&wcex))

        return 0;

    // create main window

    hwnd = CreateWindowEx(0,

                          "GLSample",

                          "SOIL Sample",

                          WS_OVERLAPPEDWINDOW,

                          CW_USEDEFAULT,

                          CW_USEDEFAULT,

                          512,

                          512,

                          NULL,

                          NULL,

                          hInstance,

                          NULL);

    ShowWindow(hwnd, nCmdShow);

    //	check my error handling

    /*

    SOIL_load_OGL_texture( "img_test.png", SOIL_LOAD_AUTO, SOIL_CREATE_NEW_ID, 0 );

    std::cout << "'" << SOIL_last_result() << "'" << std::endl;

    */

    // enable OpenGL for the window

    EnableOpenGL(hwnd, &hDC, &hRC);

    glEnable( GL_BLEND );

    //glDisable( GL_BLEND );

    //	straight alpha

    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );

    //	premultiplied alpha (remember to do the same in glColor!!)

    //glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA );

    //	do I want alpha thresholding?

    glEnable( GL_ALPHA_TEST );

    glAlphaFunc( GL_GREATER, 0.5f );

    //	log what the use is asking us to load

    std::string load_me = lpCmdLine;

    if( load_me.length() > 2 )

    {

		//load_me = load_me.substr( 1, load_me.length() - 2 );

		load_me = load_me.substr( 0, load_me.length() - 0 );

    } else

    {

    	//load_me = "img_test_uncompressed.dds";

    	//load_me = "img_test_indexed.tga";

    	//load_me = "img_test.dds";

    	load_me = "img_test.png";

    	//load_me = "odd_size.jpg";

    	//load_me = "img_cheryl.jpg";

    	//load_me = "oak_odd.png";

    	//load_me = "field_128_cube.dds";

    	//load_me = "field_128_cube_nomip.dds";

    	//load_me = "field_128_cube_uc.dds";

    	//load_me = "field_128_cube_uc_nomip.dds";

    	//load_me = "Goblin.dds";

    	//load_me = "parquet.dds";

    	//load_me = "stpeters_probe.hdr";

    	//load_me = "VeraMoBI_sdf.png";

    	//	for testing the texture rectangle code

    	//load_me = "test_rect.png";

    }

	std::cout << "'" << load_me << "'" << std::endl;

	//	1st try to load it as a single-image-cubemap

	//	(note, need DDS ordered faces: "EWUDNS")

	GLuint tex_ID;

    int time_me;

    std::cout << "Attempting to load as a cubemap" << std::endl;

    time_me = clock();

	tex_ID = SOIL_load_OGL_single_cubemap(

			load_me.c_str(),

			SOIL_DDS_CUBEMAP_FACE_ORDER,

			SOIL_LOAD_AUTO,

			SOIL_CREATE_NEW_ID,

			SOIL_FLAG_POWER_OF_TWO

			| SOIL_FLAG_MIPMAPS

			//| SOIL_FLAG_COMPRESS_TO_DXT

			//| SOIL_FLAG_TEXTURE_REPEATS

			//| SOIL_FLAG_INVERT_Y

			| SOIL_FLAG_DDS_LOAD_DIRECT

			);

	time_me = clock() - time_me;

	std::cout << "the load time was " << 0.001f * time_me << " seconds (warning: low resolution timer)" << std::endl;

    if( tex_ID > 0 )

    {

    	glEnable( GL_TEXTURE_CUBE_MAP );

		glEnable( GL_TEXTURE_GEN_S );

		glEnable( GL_TEXTURE_GEN_T );

		glEnable( GL_TEXTURE_GEN_R );

		glTexGeni( GL_S, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP );

		glTexGeni( GL_T, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP );

		glTexGeni( GL_R, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP );

		glBindTexture( GL_TEXTURE_CUBE_MAP, tex_ID );

		//	report

		std::cout << "the loaded single cube map ID was " << tex_ID << std::endl;

		//std::cout << "the load time was " << 0.001f * time_me << " seconds (warning: low resolution timer)" << std::endl;

    } else

    {

    	std::cout << "Attempting to load as a HDR texture" << std::endl;

		time_me = clock();

		tex_ID = SOIL_load_OGL_HDR_texture(

				load_me.c_str(),

				//SOIL_HDR_RGBE,

				//SOIL_HDR_RGBdivA,

				SOIL_HDR_RGBdivA2,

				0,

				SOIL_CREATE_NEW_ID,

				SOIL_FLAG_POWER_OF_TWO

				| SOIL_FLAG_MIPMAPS

				//| SOIL_FLAG_COMPRESS_TO_DXT

				);

		time_me = clock() - time_me;

		std::cout << "the load time was " << 0.001f * time_me << " seconds (warning: low resolution timer)" << std::endl;

		//	did I fail?

		if( tex_ID < 1 )

		{

			//	loading of the single-image-cubemap failed, try it as a simple texture

			std::cout << "Attempting to load as a simple 2D texture" << std::endl;

			//	load the texture, if specified

			time_me = clock();

			tex_ID = SOIL_load_OGL_texture(

					load_me.c_str(),

					SOIL_LOAD_AUTO,

					SOIL_CREATE_NEW_ID,

					SOIL_FLAG_POWER_OF_TWO

					| SOIL_FLAG_MIPMAPS

					//| SOIL_FLAG_MULTIPLY_ALPHA

					//| SOIL_FLAG_COMPRESS_TO_DXT

					| SOIL_FLAG_DDS_LOAD_DIRECT

					//| SOIL_FLAG_NTSC_SAFE_RGB

					//| SOIL_FLAG_CoCg_Y

					//| SOIL_FLAG_TEXTURE_RECTANGLE

					);

			time_me = clock() - time_me;

			std::cout << "the load time was " << 0.001f * time_me << " seconds (warning: low resolution timer)" << std::endl;

		}

		if( tex_ID > 0 )

		{

			//	enable texturing

			glEnable( GL_TEXTURE_2D );

			//glEnable( 0x84F5 );// enables texture rectangle

			//  bind an OpenGL texture ID

			glBindTexture( GL_TEXTURE_2D, tex_ID );

			//	report

			std::cout << "the loaded texture ID was " << tex_ID << std::endl;

			//std::cout << "the load time was " << 0.001f * time_me << " seconds (warning: low resolution timer)" << std::endl;

		} else

		{

			//	loading of the texture failed...why?

			glDisable( GL_TEXTURE_2D );

			std::cout << "Texture loading failed: '" << SOIL_last_result() << "'" << std::endl;

		}

    }

    // program main loop

    const float ref_mag = 0.1f;

    while (!bQuit)

    {

        // check for messages

        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))

        {

            // handle or dispatch messages

            if (msg.message == WM_QUIT)

            {

                bQuit = TRUE;

            }

            else

            {

                TranslateMessage(&msg);

                DispatchMessage(&msg);

            }

        }

        else

        {

            // OpenGL animation code goes here

            theta = clock() * 0.1f;

            float tex_u_max = 1.0f;//0.2f;

            float tex_v_max = 1.0f;//0.2f;

            glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

            glClear(GL_COLOR_BUFFER_BIT);

            glPushMatrix();

            glScalef( 0.8f, 0.8f, 0.8f );

            //glRotatef(-0.314159f*theta, 0.0f, 0.0f, 1.0f);

			glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );

			glNormal3f( 0.0f, 0.0f, 1.0f );

            glBegin(GL_QUADS);

				glNormal3f( -ref_mag, -ref_mag, 1.0f );

                glTexCoord2f( 0.0f, tex_v_max );

                glVertex3f( -1.0f, -1.0f, -0.1f );

                glNormal3f( ref_mag, -ref_mag, 1.0f );

                glTexCoord2f( tex_u_max, tex_v_max );

                glVertex3f( 1.0f, -1.0f, -0.1f );

                glNormal3f( ref_mag, ref_mag, 1.0f );

                glTexCoord2f( tex_u_max, 0.0f );

                glVertex3f( 1.0f, 1.0f, -0.1f );

                glNormal3f( -ref_mag, ref_mag, 1.0f );

                glTexCoord2f( 0.0f, 0.0f );

                glVertex3f( -1.0f, 1.0f, -0.1f );

            glEnd();

            glPopMatrix();

			tex_u_max = 1.0f;

            tex_v_max = 1.0f;

            glPushMatrix();

            glScalef( 0.8f, 0.8f, 0.8f );

            glRotatef(theta, 0.0f, 0.0f, 1.0f);

			glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );

			glNormal3f( 0.0f, 0.0f, 1.0f );

            glBegin(GL_QUADS);

                glTexCoord2f( 0.0f, tex_v_max );		glVertex3f( 0.0f, 0.0f, 0.1f );

                glTexCoord2f( tex_u_max, tex_v_max );		glVertex3f( 1.0f, 0.0f, 0.1f );

                glTexCoord2f( tex_u_max, 0.0f );		glVertex3f( 1.0f, 1.0f, 0.1f );

                glTexCoord2f( 0.0f, 0.0f );		glVertex3f( 0.0f, 1.0f, 0.1f );

            glEnd();

            glPopMatrix();

            {

				/*	check for errors	*/

				GLenum err_code = glGetError();

				while( GL_NO_ERROR != err_code )

				{

					printf( "OpenGL Error @ %s: %i", "drawing loop", err_code );

					err_code = glGetError();

				}

			}

            SwapBuffers(hDC);

            Sleep (1);

        }

    }

    //	and show off the screenshot capability

    /*

    load_me += "-screenshot.tga";

    SOIL_save_screenshot( load_me.c_str(), SOIL_SAVE_TYPE_TGA, 0, 0, 512, 512 );

    //*/

    //*

    load_me += "-screenshot.bmp";

    SOIL_save_screenshot( load_me.c_str(), SOIL_SAVE_TYPE_BMP, 0, 0, 512, 512 );

    //*/

    /*

    load_me += "-screenshot.dds";

    SOIL_save_screenshot( load_me.c_str(), SOIL_SAVE_TYPE_DDS, 0, 0, 512, 512 );

    //*/

    // shutdown OpenGL

    DisableOpenGL(hwnd, hDC, hRC);

    // destroy the window explicitly

    DestroyWindow(hwnd);

    return msg.wParam;

}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)

{

    switch (uMsg)

    {

        case WM_CLOSE:

            PostQuitMessage(0);

        break;

        case WM_DESTROY:

            return 0;

        case WM_KEYDOWN:

        {

            switch (wParam)

            {

                case VK_ESCAPE:

                    PostQuitMessage(0);

                break;

            }

        }

        break;

        default:

            return DefWindowProc(hwnd, uMsg, wParam, lParam);

    }

    return 0;

}

void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)

{

    PIXELFORMATDESCRIPTOR pfd;

    int iFormat;

    /* get the device context (DC) */

    *hDC = GetDC(hwnd);

    /* set the pixel format for the DC */

    ZeroMemory(&pfd, sizeof(pfd));

    pfd.nSize = sizeof(pfd);

    pfd.nVersion = 1;

    pfd.dwFlags = PFD_DRAW_TO_WINDOW |

                  PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;

    pfd.iPixelType = PFD_TYPE_RGBA;

    pfd.cColorBits = 24;

    pfd.cDepthBits = 16;

    pfd.iLayerType = PFD_MAIN_PLANE;

    iFormat = ChoosePixelFormat(*hDC, &pfd);

    SetPixelFormat(*hDC, iFormat, &pfd);

    /* create and enable the render context (RC) */

    *hRC = wglCreateContext(*hDC);

    wglMakeCurrent(*hDC, *hRC);

}

void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)

{

    wglMakeCurrent(NULL, NULL);

    wglDeleteContext(hRC);

    ReleaseDC(hwnd, hDC);

}