/*
    Following the vulkan tutorial on :
    https://vulkan-tutorial.com/en/Drawing_a_triangle/Setup/Instance

*/




#define GLFW_INCLUDE_VULKAN
#include <GLFW/glfw3.h>
#include <iostream>
#include <stdexcept>
#include <cstdlib>

const uint32_t WIDTH = 800;
const uint32_t HEIGHT = 600;

class HelloTriangleApplication{
    public :
        void run (){
            initWindow();
            initVulkan();
            mainLoop();
            cleanup();
        }

    private:
        GLFWwindow* window;
        VkInstance instance;

        void initWindow(){
            glfwInit();

            glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
            glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);

            window = glfwCreateWindow(WIDTH, HEIGHT, "Vulkan", nullptr, nullptr);
        }

        void initVulkan(){
            createInstance();
        }



        void createInstance(){
            VkApplicationInfo appInfo{};
            appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
            appInfo.pApplicationName = "Hello Triangle";
            appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
            appInfo.pEngineName = "No Engine";
            appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
            appInfo.apiVersion = VK_API_VERSION_1_0;

            VkInstanceCreateInfo createInfo{};
            createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
            createInfo.pApplicationInfo = &appInfo;

            uint32_t glfwExtesionCount = 0;
            const char** glfwExtensions;

            glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtesionCount);
            
            createInfo.enabledExtensionCount = glfwExtesionCount;
            createInfo.ppEnabledExtensionNames = glfwExtensions;
            createInfo.enabledLayerCount = 0;

            if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS ){
                throw std::runtime_error("Failed to create instance!");
            }



        }

        void mainLoop(){
                while (!glfwWindowShouldClose(window)){
                    glfwPollEvents();
                }
        }

        void cleanup(){
            glfwDestroyWindow(window);

            glfwTerminate();
        }
};


int main ( ) {
    HelloTriangleApplication app;

    try{
        app.run();
    } catch (const std::exception& e){
        std::cerr << e.what() << std::endl;
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
    
}