#ifndef GLAD
#define GLAD
#include <glad/glad.h>
#endif 

#include <GLFW/glfw3.h>
#include <map>
#include <iostream>
#include <fstream>
#include <math.h>
#include <numbers>
#include <vector>
#include <png.h>
#include <stdio.h>

#include "shader.hpp"
#include "game.hpp"
#include "texture.hpp"
#include "mainMenu.hpp"
#include "text.hpp"

//Is called when the window is resized
void framebuffer_resize(GLFWwindow* win, int width, int height){
	glViewport(0,0,width,height);
}

const char* vsFileName = "shaders/vertex_shader.glsl";
const char* fsFileName = "shaders/fragment_shader.glsl";

unsigned int Text::texture;
Shader Text::shader;


int main(){
	//OpenGL stuff
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif

	GLFWwindow* win = glfwCreateWindow(640,320,"Minicraft",NULL,NULL);
	if(win==NULL){
		std::cerr << "Error while creating window" << std::endl;
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(win);
	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
	{
	    std::cerr << "Error while initialising GLAD" << std::endl;
	    return -1;
	}

	//When the window is resized it calls framebuffer_resize
	glfwSetFramebufferSizeCallback(win,framebuffer_resize);

	
	//Makes sure that things that are closer are drawn on top
	//of things that are further
	glEnable(GL_DEPTH_TEST);
	
	//Makes sure see-through textures are see-through
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);


    	unsigned int VBO, VAO, EBO;
	unsigned int shaderProgram;

	Text::initFont();

	Button b = Button("Create World", 0, -0.5,0.5,0.25);

	Control* control = new mainMenu(win);
	//Main loop
	while(!glfwWindowShouldClose(win)){
		Control* newControl = control->handle(win);
		if(newControl){
			control->shutdown();
			delete control;
			control =newControl;
		}
		int width,height;	
		glfwGetWindowSize(win,&width,&height);
		float screenRatio = (float)height/(float)width;
		//Clear the screen
		glClearColor(0.0,0.0,1.0f,1.0f/*blue*/);
		glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

		control->draw(screenRatio);

		glfwSwapBuffers(win);
		glfwPollEvents();
	}
	control->shutdown();
	//delete control;
	glfwTerminate();
	return 0;

}