/*
 * Reference
 * http://anttweakbar.sourceforge.net/doc/tools:anttweakbar:howto
 * https://github.com/SpriteStudio/SpriteStudio5-SDK/blob/master/viewer_sample/main.cpp
 */

#include <AntTweakBar.h>
#include <GL/glfw3.h>
#include <stdio.h>

//typedef void (* GLFWmousebuttonfun)(GLFWwindow*,int,int,int);
void MouseButtonCB( GLFWwindow*,int button ,int action ,int mods)
{
	TwEventMouseButtonGLFW( button , action );
}

//typedef void (* GLFWcursorposfun)(GLFWwindow*,double,double);
void MousePosCB(GLFWwindow*,double x ,double y)
{
	TwEventMousePosGLFW( (int)x, (int)y );
}

//typedef void (* GLFWkeyfun)(GLFWwindow*,int,int,int,int);
void KeyFunCB( GLFWwindow* window,int key,int scancode,int action,int mods)
{
	TwEventKeyGLFW( key , action );
	TwEventCharGLFW( key  , action );
}

//typedef void (* GLFWscrollfun)(GLFWwindow*,double,double);
void MouseScrollCB(  GLFWwindow* window, double x , double y )
{
	TwEventMouseWheelGLFW( (int)y );
}


int main(void)
{
    GLFWwindow* window;
	int window_width = 640;
	int window_height = 480;

    /* Initialize the library */
	if (!glfwInit()){
		printf(" Can't initialize GLFW.\n");
		return -1;
	}
	
	/* Setting of resize */
	glfwWindowHint( GLFW_RESIZABLE, GL_FALSE);
	
    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(window_width, window_height, "AntTweakBar using GLFW", NULL, NULL);
    if (!window)
    {
		printf(" Can't create GLFW window.\n");
        glfwTerminate();
        return -1;
    }
	
    /* Make the window's context current */
    glfwMakeContextCurrent(window);
	
	printf("============================================\n");
	printf(" Vendor : %s\n",glGetString(GL_VENDOR));
	printf(" GPU : %s\n",glGetString(GL_RENDERER));
	printf(" OpenGL ver. %s\n",glGetString(GL_VERSION));
	printf("============================================\n\n");
	
	/* Initialize AntTweakBar */
	TwInit(TW_OPENGL,NULL);
	
	/* Tell the size of the graphic window to AntTweakBar */
	TwWindowSize(window_width,window_height);
	
	/* Create a tweak bar*/
	TwBar *bar = TwNewBar("TweakBar");
	TwDefine(" GLOBAL help='This example shows how to integrate AntTweakBar with GLFW and OpenGL.' "); // Message added to the help bar.
	
	/* Set GLFW event callbacks */
    // - Directly redirect GLFW mouse button events to AntTweakBar
    glfwSetMouseButtonCallback( window , MouseButtonCB );
    // - Directly redirect GLFW mouse position events to AntTweakBar
	glfwSetCursorPosCallback( window , MousePosCB);
    // - Directly redirect GLFW mouse wheel events to AntTweakBar
	glfwSetScrollCallback( window , MouseScrollCB );
    // - Directly redirect GLFW key events to AntTweakBar
    glfwSetKeyCallback(window , KeyFunCB);
	
	/* Initialize */
	glClearColor(0.0, 0.0, 0.0, 0.0); // Background color
	glEnable(GL_DEPTH_TEST); // 
	
	/* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
		/* Clear buffer */
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	
		
        /* Render here */
		TwDraw(); // draw the tweak bar(s)
		
        /* Swap front and back buffers */
        glfwSwapBuffers(window);
		
		/* Waiting for events */
		glfwWaitEvents();
		
        /* Poll for and process events */
        //glfwPollEvents();
    }
	
	TwTerminate();
    glfwTerminate();
    return 0;
}