#include "DarkRP2D.h"

#ifndef NDEBUG
	#include "imgui.h"
	#include "imgui_impl_sdl_gl3.h"
#endif

#include <GL/glew.h>
#include <iostream>
#include <entityx/entityx.h>

DarkRP2D::~DarkRP2D() {
	std::cout << "Game got destroyed!" << std::endl;
	#ifndef NDEBUG
		ImGui_ImplSdlGL3_Shutdown();
    	ImGui::DestroyContext();
	#endif
	delete assets;
	delete obj;
	delete inputHandler;
	delete camera;
	delete renderer;
}

void DarkRP2D::create () {
	std::cout << "Hello World!" << std::endl;
	assets = new Assets();
	assets->loadTexture("police_officer.png",true,"police_officer");
	assets->loadShader("vert.shader","frag.shader",nullptr,"defaultShader");
	assets->loadShader("bitmapvert.shader","bitmapfrag.shader",nullptr,"bitmapShader");

	renderer = new Renderer();

	std::vector<Vertex2D> vertices({
		Vertex2D{glm::vec2(-0.5f,-0.5f), glm::vec2(0.0f,1.0f)},
		Vertex2D{glm::vec2(0.5f,-0.5f), glm::vec2(1.0f,1.0f)},
		Vertex2D{glm::vec2(0.5f,0.5f), glm::vec2(1.0f,0.0f)},
		Vertex2D{glm::vec2(-0.5f,0.5f), glm::vec2(0.0f,0.0f)}
	});
	std::vector<unsigned int> indices({
		0,1,3,
		1,2,3
	});

	obj = new Mesh(vertices,indices,assets->getTexture("police_officer"));
	inputHandler = new InputHandler();
	font = new BitmapFont("arial.ttf");

	camera = new OrtographicCamera();

	entityx::EntityX ex;
	entityx::Entity charakter = ex.entities.create();
	charakter.assign<Position>();

	#ifndef NDEBUG
		//Setup IMGUI debugging
		ImGui::CreateContext();
		ImGui_ImplSdlGL3_Init(this->gWindow);
		ImGui::StyleColorsDark();
	#endif
}

void DarkRP2D::loop(unsigned int delta) {
	static unsigned int accumulator = 0, ups = 0, fps = 0, acc = 0;
	accumulator += delta;
	acc += delta;

	while(accumulator >= 17) {
		accumulator -= 17;
		update(delta);
		ups++;
	}

	if(acc >= 1000) {
		std::cout << "Updates per second: " << ups << " Frames per Second: " << fps << std::endl;
		acc -= 1000;
		ups = 0;
		fps = 0;
	}
	render(delta);
	fps++;
}

void DarkRP2D::update(unsigned int delta) {
	SDL_Event event;
	while(SDL_PollEvent(&event) != 0) {
		Command* command = inputHandler->handleInput(&event);
		if (command) {
			command->execute();
		}
	}

	//camera update
}

#ifndef NDEBUG
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
#endif

void DarkRP2D::render(unsigned int delta) {
	renderer->clear();
	#ifndef NDEBUG
		ImGui_ImplSdlGL3_NewFrame(gWindow);
	#endif

	//Drawing
	Shader defaultShader = assets->getShader("defaultShader");
	defaultShader.SetMatrix4("MVP",camera->getCombinedMatrix(),true);
	//Draw Mesh	
	renderer->draw(*obj,defaultShader);
	
	//texttest
	Shader bitmapShader = assets->getShader("bitmapShader");
	font->drawText(bitmapShader, "Hallo du noob", 25.0f, 25.0f, 1.f, glm::vec3(0.5f,0.8f,0.2f));


	#ifndef NDEBUG
		// 1. Show a simple window.
        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
        {
            static float f = 0.0f;
            static int counter = 0;
            ImGui::Text("-------------------OpenGL Info-------------------------");
			ImGui::Text("GLEW Version: %s\n", glewGetString(GLEW_VERSION));
			ImGui::Text("     Version: %s\n", glGetString(GL_VERSION));
			ImGui::Text("      Vendor: %s\n", glGetString(GL_VENDOR));
			ImGui::Text("    Renderer: %s\n", glGetString(GL_RENDERER));
			ImGui::Text("     Shading: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION));
			ImGui::Text("----------------------------------------------------------");
            ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
        }

		ImGui::Render();
    	ImGui_ImplSdlGL3_RenderDrawData(ImGui::GetDrawData());
	#endif
	SDL_GL_SwapWindow(gWindow);
}

void DarkRP2D::resize(int width, int height){
}