#include <stdio.h>
#include "glfw3.h"
//#include "spdlog.h"
GLFWwindow *  window;

int main (void) {

//	spdlog::info("Welcome to spdlog!");

	if ( !glfwInit()){
		puts("Failed to initialize GLFW!");
		return -1;
	}


	window = glfwCreateWindow( 640 , 480, "BarinkEngine", NULL, NULL);

	if( !window){
		puts("Failed to create the window");
		glfwTerminate();
		return -1;
	}



	glfwMakeContextCurrent(window);

	if(glfwVulkanSupported()) 
	{
		puts("Vulkan is supported!");
	}


	int width,height;
	glfwGetFramebufferSize(window, &width, &height);
	glViewport(0,0, width, height);

// SOURCE: https://learnopengl.com/Getting-started/Hello-Triangle


	float vertices[] = {
		-0.5, -0.5f, 0.0f,
		0.5, -0.5f, 0.0f,
		0.5, 0.5f, 0.0f,
		
	};

	unsigned int VBO;
	glGenBuffers(1,&VBO);

	glBindBuffer(GL_ARRAY_BUFFER, VBO);

	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

	// Load the vertex shader program
	const char *vertexShaderSource = "#version 330 core\n"
    "layout (location = 0) in vec3 aPos;\n"
    "void main()\n"
    "{\n"
    "   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
    "}\0";

	unsigned int vertexShader;
	vertexShader = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
	glCompileShader(vertexShader);

	const char *fragmentShaderSource = "#version 330 core\n"
	"out vec4 FragColor;\n"
	"void main ()\n {\n"
	"FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f); \n"
	"}\n";

	unsigned int fragmentShader ;
	fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
	glCompileShader(fragmentShader);

	unsigned int shaderProgram;
	shaderProgram = glCreateProgram();

	glAttachShader (shaderProgram, vertexShader);
	glAttachShader(shaderProgram, fragmentShader);
	glLinkProgram(shaderProgram);

	glUseProgram(shaderProgram);

	glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,3*sizeof(float), (void*)0);
	glEnableVertexAttribArray(0);

	// Copy our vertices array in a buffer for OpenGL to use
	glBindBuffer(GL_ARRAY_BUFFER, VBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

	// then set the vertex attributes pointers
	glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,3*sizeof(float), (void*)0);
	glEnableVertexAttribArray(0);
	

	unsigned int VAO;
	glGenVertexArrays(1,&VAO);

	glBindVertexArray(VAO);

	// use our hader program when we want to render an object
	glUseProgram(shaderProgram);
	glBindVertexArray(VAO);


	while(!glfwWindowShouldClose(window)){
		/* Start rendering here */
		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT);


		glDrawArrays(GL_TRIANGLES, 0, 3);


		/* Swap front and back buffers */
		glfwSwapBuffers(window);

		/* Poll for and process events */
		glfwPollEvents();
	}


	glDeleteShader(vertexShader);
	glDeleteShader(fragmentShader);


	glfwTerminate();
	

	return 0;
}