//
// Created by timo on 03.04.25.
//

#include "vulkan_app.hpp"
// throws duplicate include errors when in vulkan_app.hpp
#define STB_IMAGE_IMPLEMENTATION
#include <stb/stb_image.h>

namespace vapp{
    const std::vector<const char*> validationLayers = {
        "VK_LAYER_KHRONOS_validation"
    };

    const std::vector<const char*> deviceExtensions = {
        VK_KHR_SWAPCHAIN_EXTENSION_NAME,
    };

    static VKAPI_ATTR VkBool32 VKAPI_CALL debugCallback(VkDebugUtilsMessageSeverityFlagBitsEXT messageSeverity, VkDebugUtilsMessageTypeFlagsEXT messageType, const VkDebugUtilsMessengerCallbackDataEXT *pCallbackData, void *pUserData){
        std::cerr << "Validation Layer: " << pCallbackData->pMessage << std::endl;
        return VK_FALSE;
    }

    VkResult CreateDebugUtilsMessengerEXT(VkInstance instance, const VkDebugUtilsMessengerCreateInfoEXT *pCreateInfo, const VkAllocationCallbacks *pAllocator, VkDebugUtilsMessengerEXT *pDebugMessenger){
        auto func = (PFN_vkCreateDebugUtilsMessengerEXT)vkGetInstanceProcAddr(
            instance, "vkCreateDebugUtilsMessengerEXT");
        if(func == nullptr) return VK_ERROR_EXTENSION_NOT_PRESENT;
        if(func == nullptr) return VK_ERROR_EXTENSION_NOT_PRESENT;
        return func(instance, pCreateInfo, pAllocator, pDebugMessenger);
    }

    void DestroyDebugUtilsMessengerEXT(VkInstance instance, VkDebugUtilsMessengerEXT debugMessenger, const VkAllocationCallbacks *pAllocator){
        if(auto func = (PFN_vkDestroyDebugUtilsMessengerEXT)vkGetInstanceProcAddr(
            instance, "vkDestroyDebugUtilsMessengerEXT"); func != nullptr){
            func(instance, debugMessenger, pAllocator);
        }
    }

    void populateDebugMessengerCreateInfo(VkDebugUtilsMessengerCreateInfoEXT& createInfo){
        createInfo = {};
        createInfo.sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
        createInfo.messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT |
            VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
        // set which type of messages the callback is notified about
        createInfo.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT |
            VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
        createInfo.pfnUserCallback = debugCallback;
    }

    static std::vector<char> readFile(const std::string& filename){
        std::ifstream file(filename, std::ios::ate | std::ios::binary);

        if(!file.is_open()){
            throw std::runtime_error("Func: readFile\nError: Failed to open file!");
        }

        size_t fileSize = (size_t)file.tellg();
        std::vector<char> buffer(fileSize);

        file.seekg(0);
        file.read(buffer.data(), fileSize);

        file.close();
        return buffer;
    }

    bool Vulkan::checkValidationLayerSupport(){
        uint32_t layerCount;
        vkEnumerateInstanceLayerProperties(&layerCount, nullptr);

        std::vector<VkLayerProperties> availableLayers(layerCount);
        vkEnumerateInstanceLayerProperties(&layerCount, availableLayers.data());

        for(const char *layerName : validationLayers){
            bool layerFound = false;

            for(const auto& layerProperties : availableLayers){
                if(strcmp(layerName, layerProperties.layerName) == 0){
                    layerFound = true;
                    break;
                }
            }
            if(!layerFound) return false;
        }

        return true;
    }

    std::vector<const char*> Vulkan::getRequiredExtensions(){
        uint32_t glfwExtensionCount = 0;
        const char **glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);

        std::vector<const char*> extensions(glfwExtensions, glfwExtensions + glfwExtensionCount);

        if(enableValidationLayers) extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);

        return extensions;
    }

    void Vulkan::createInstance(){
        if(enableValidationLayers && !checkValidationLayerSupport()){
            throw std::runtime_error("Func: createInstance\nError: Validation Layers requested, but not available!\n");
        }
        VkApplicationInfo appInfo{};
        appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
        appInfo.pApplicationName = "Triangle App";
        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;

        std::vector<const char*> glfwExtensions = getRequiredExtensions();
        createInfo.enabledExtensionCount = static_cast<uint32_t>(glfwExtensions.size());
        createInfo.ppEnabledExtensionNames = glfwExtensions.data();

        VkDebugUtilsMessengerCreateInfoEXT debugCreateInfo{};
        if(enableValidationLayers){
            createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
            createInfo.ppEnabledLayerNames = validationLayers.data();
            populateDebugMessengerCreateInfo(debugCreateInfo);
            createInfo.pNext = (VkDebugUtilsMessengerCreateInfoEXT*)&debugCreateInfo;
        }
        else{
            createInfo.enabledLayerCount = 0;
            createInfo.pNext = nullptr;
        }

        if(vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS){
            throw std::runtime_error("Func: createInstance\nError: Failed to create Instance!\n");
        }

        uint32_t extensionCount = 0;
        vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, nullptr);

        std::vector<VkExtensionProperties> extensions(extensionCount);
        vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, extensions.data());

        if(enableValidationLayers){
            std::cout << "Available Extensions (" << extensionCount << "):\n";
            for(VkExtensionProperties extension : extensions){
                std::cout << '\t' << extension.extensionName << '\n';
            }
        }
    }

    void Vulkan::setupDebugMessenger(){
        if(!enableValidationLayers) return;
        VkDebugUtilsMessengerCreateInfoEXT createInfo{};
        populateDebugMessengerCreateInfo(createInfo);

        if(CreateDebugUtilsMessengerEXT(instance, &createInfo, nullptr, &debugMessenger) != VK_SUCCESS){
            throw std::runtime_error("Func: setupDebugMessenger\nError: Failed to set up Debug Messenger!\n");
        }
    }

    void Vulkan::pickPhysicalDevice(){
        uint32_t deviceCount = 0;
        vkEnumeratePhysicalDevices(instance, &deviceCount, nullptr);
        if(deviceCount == 0){
            throw std::runtime_error("Func: pickPhysicalDevice\nError: Failed to find GPUs with Vulkan support!\n");
        }

        std::vector<VkPhysicalDevice> devices(deviceCount);
        vkEnumeratePhysicalDevices(instance, &deviceCount, devices.data());

        for(VkPhysicalDevice device : devices){
            if(isDeviceSuitable(device)){
                physicalDevice = device;
                break;
            }
        }

        if(physicalDevice == VK_NULL_HANDLE){
            throw std::runtime_error("Func: pickPhysicalDevice\nError: Failed to find suitable GPU!\n");
        }
    }

    void Vulkan::createLogicalDevice(){
        QueueFamilyIndices indices = findQueueFamilies(physicalDevice);

        std::vector<VkDeviceQueueCreateInfo> queueCreateInfos;
        std::set<uint32_t> uniqueQueueFamilies = {indices.graphicsFamily.value(), indices.presentFamily.value()};

        float queuePriority = 1.0f;
        for(uint32_t queueFamily : uniqueQueueFamilies){
            VkDeviceQueueCreateInfo queueCreateInfo{};
            queueCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
            queueCreateInfo.queueFamilyIndex = queueFamily;
            queueCreateInfo.queueCount = 1;
            queueCreateInfo.pQueuePriorities = &queuePriority;
            queueCreateInfos.push_back(queueCreateInfo);
        }

        VkPhysicalDeviceFeatures deviceFeatures{};
        deviceFeatures.samplerAnisotropy = VK_TRUE;

        VkDeviceCreateInfo createInfo{};
        createInfo.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
        createInfo.queueCreateInfoCount = static_cast<uint32_t>(queueCreateInfos.size());
        createInfo.pQueueCreateInfos = queueCreateInfos.data();

        createInfo.pEnabledFeatures = &deviceFeatures;

        // not used anymore but sets backwards compatibility
        createInfo.enabledExtensionCount = static_cast<uint32_t>(deviceExtensions.size());
        createInfo.ppEnabledExtensionNames = deviceExtensions.data();

        if(enableValidationLayers){
            createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
            createInfo.ppEnabledLayerNames = validationLayers.data();
        }
        else{
            createInfo.enabledLayerCount = 0;
        }

        if(vkCreateDevice(physicalDevice, &createInfo, nullptr, &device) != VK_SUCCESS){
            throw std::runtime_error("Func: createLogicalDevice\nError: Failed to create logical Device!\n");
        }

        vkGetDeviceQueue(device, indices.graphicsFamily.value(), 0, &graphicsQueue);
        vkGetDeviceQueue(device, indices.presentFamily.value(), 0, &presentQueue);
    }

    QueueFamilyIndices Vulkan::findQueueFamilies(VkPhysicalDevice device){
        QueueFamilyIndices indices;

        uint32_t queueFamilyCount = 0;
        vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, nullptr);

        std::vector<VkQueueFamilyProperties> queueFamilies(queueFamilyCount);
        vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, queueFamilies.data());

        int i = 0;
        for(const VkQueueFamilyProperties queueFamily : queueFamilies){
            VkBool32 presentSupport = false;
            vkGetPhysicalDeviceSurfaceSupportKHR(device, i, surface, &presentSupport);
            if(presentSupport) indices.presentFamily = i;
            if(queueFamily.queueFlags & VK_QUEUE_GRAPHICS_BIT) indices.graphicsFamily = i;
            if(indices.isComplete()) break;
            i++;
        }

        return indices;
    }

    bool Vulkan::checkDeviceExtensionSupport(VkPhysicalDevice device){
        uint32_t extensionCount;
        vkEnumerateDeviceExtensionProperties(device, nullptr, &extensionCount, nullptr);

        std::vector<VkExtensionProperties> availableExtensions(extensionCount);
        vkEnumerateDeviceExtensionProperties(device, nullptr, &extensionCount, availableExtensions.data());

        std::set<std::string> requiredExtensions(deviceExtensions.begin(), deviceExtensions.end());

        for(const VkExtensionProperties& extension : availableExtensions){
            requiredExtensions.erase(extension.extensionName);
        }

        return requiredExtensions.empty();
    }

    bool Vulkan::isDeviceSuitable(VkPhysicalDevice device){
        QueueFamilyIndices indices = findQueueFamilies(device);
        bool extensionSupported = checkDeviceExtensionSupport(device);
        bool swapChainAdequate = false;
        if(extensionSupported){
            SwapChainSupportDetails swapChainSupport = querySwapChainSupport(device);
            swapChainAdequate = !swapChainSupport.formats.empty() && !swapChainSupport.presentModes.empty();
        }

        VkPhysicalDeviceFeatures supportedFeatures;
        vkGetPhysicalDeviceFeatures(device, &supportedFeatures);

        return indices.isComplete() && extensionSupported && swapChainAdequate && supportedFeatures.samplerAnisotropy;
    }

    void Vulkan::createSurface(){
        if(glfwCreateWindowSurface(instance, window, nullptr, &surface) != VK_SUCCESS){
            throw std::runtime_error("Func: createSurface\nError: Failed to create Window Surface!\n");
        }
    }

    SwapChainSupportDetails Vulkan::querySwapChainSupport(VkPhysicalDevice device){
        SwapChainSupportDetails details;

        vkGetPhysicalDeviceSurfaceCapabilitiesKHR(device, surface, &details.capabilities);

        uint32_t formatCount;
        vkGetPhysicalDeviceSurfaceFormatsKHR(device, surface, &formatCount, nullptr);

        if(formatCount != 0){
            details.formats.resize(formatCount);
            vkGetPhysicalDeviceSurfaceFormatsKHR(device, surface, &formatCount, details.formats.data());
        }

        uint32_t presentModeCount;
        vkGetPhysicalDeviceSurfacePresentModesKHR(device, surface, &presentModeCount, nullptr);

        if(presentModeCount != 0){
            details.presentModes.resize(presentModeCount);
            vkGetPhysicalDeviceSurfacePresentModesKHR(device, surface, &presentModeCount, details.presentModes.data());
        }

        return details;
    }

    VkSurfaceFormatKHR Vulkan::chooseSwapSurfaceFormat(const std::vector<VkSurfaceFormatKHR>& availableFormats){
        for(const VkSurfaceFormatKHR availableFormat : availableFormats){
            if(availableFormat.format == VK_FORMAT_R8G8B8A8_SRGB && availableFormat.colorSpace ==
                VK_COLOR_SPACE_SRGB_NONLINEAR_KHR){
                return availableFormat;
            }
        }

        return availableFormats[0];
    }

    VkPresentModeKHR Vulkan::chooseSwapPresentMode(const std::vector<VkPresentModeKHR> availablePresentModes){
        for(const VkPresentModeKHR availablePresentMode : availablePresentModes){
            if(availablePresentMode == WISHED_PRESENT_MODE){
                return availablePresentMode;
            }
        }
        return VK_PRESENT_MODE_FIFO_KHR; // always available
    }

    VkExtent2D Vulkan::chooseSwapExtent(const VkSurfaceCapabilitiesKHR& capabilities){
        if(capabilities.currentExtent.width != std::numeric_limits<uint32_t>::max()){
            return capabilities.currentExtent;
        }

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

        VkExtent2D actualExtent = {
            static_cast<uint32_t>(width),
            static_cast<uint32_t>(height)
        };

        actualExtent.width = std::clamp(actualExtent.width, capabilities.minImageExtent.width,
                                        capabilities.maxImageExtent.width);
        actualExtent.width = std::clamp(actualExtent.height, capabilities.minImageExtent.height,
                                        capabilities.maxImageExtent.height);

        return actualExtent;
    }

    void Vulkan::createSwapChain(){
        SwapChainSupportDetails swapChainSupport = querySwapChainSupport(physicalDevice);
        VkSurfaceFormatKHR surfaceFormat = chooseSwapSurfaceFormat(swapChainSupport.formats);
        VkPresentModeKHR presentMode = chooseSwapPresentMode(swapChainSupport.presentModes);
        VkExtent2D extent = chooseSwapExtent(swapChainSupport.capabilities);

        uint32_t imageCount = swapChainSupport.capabilities.minImageCount + 1;

        if(swapChainSupport.capabilities.maxImageCount > 0 && imageCount > swapChainSupport.capabilities.maxImageCount){
            imageCount = swapChainSupport.capabilities.maxImageCount;
        }

        VkSwapchainCreateInfoKHR createInfo{};
        createInfo.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
        createInfo.surface = surface;

        createInfo.minImageCount = imageCount;
        createInfo.imageFormat = surfaceFormat.format;
        createInfo.imageColorSpace = surfaceFormat.colorSpace;
        createInfo.imageExtent = extent;
        createInfo.imageArrayLayers = 1;
        createInfo.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;

        QueueFamilyIndices indices = findQueueFamilies(physicalDevice);
        uint32_t queueFamiliyIndices[] = {indices.graphicsFamily.value(), indices.presentFamily.value()};

        if(indices.graphicsFamily != indices.presentFamily){
            createInfo.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
            createInfo.queueFamilyIndexCount = 2;
            createInfo.pQueueFamilyIndices = queueFamiliyIndices;
        }
        else{
            createInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
            // rest would default which already is
        }

        createInfo.preTransform = swapChainSupport.capabilities.currentTransform;
        createInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
        createInfo.presentMode = presentMode;
        createInfo.clipped = VK_TRUE;

        createInfo.oldSwapchain = VK_NULL_HANDLE; // swap chain needs to be recreated when window is resized

        if(vkCreateSwapchainKHR(device, &createInfo, nullptr, &swapChain) != VK_SUCCESS){
            throw std::runtime_error("Func: createSwapChain\nError: Failed to create Swap Chain!\n");
        }

        vkGetSwapchainImagesKHR(device, swapChain, &imageCount, nullptr);
        swapChainImages.resize(imageCount);
        vkGetSwapchainImagesKHR(device, swapChain, &imageCount, swapChainImages.data());

        swapChainImageFormat = surfaceFormat.format;
        swapChainExtent = extent;
    }

    void Vulkan::createImageViews(){
        swapChainImageViews.resize(swapChainImages.size());

        for(uint32_t i = 0; i < swapChainImages.size(); i++){
            swapChainImageViews[i] = createImageView(swapChainImages[i], swapChainImageFormat);
        }
    }

    void Vulkan::createDescriptorSetLayout(){
        VkDescriptorSetLayoutBinding uboLayoutBinding{};
        uboLayoutBinding.binding = 0;
        uboLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
        uboLayoutBinding.descriptorCount = 1;
        uboLayoutBinding.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;

        VkDescriptorSetLayoutCreateInfo layoutInfo{};
        layoutInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
        layoutInfo.bindingCount = 1;
        layoutInfo.pBindings = &uboLayoutBinding;

        if(vkCreateDescriptorSetLayout(device, &layoutInfo, nullptr, &descriptorSetLayout) != VK_SUCCESS){
            throw std::runtime_error("Func: createDescriptorSetLayout\nError: Failed to create Descriptor Set Layout!\n");
        }
    }

    void Vulkan::createGraphicsPipeline(){
        // TODO: find solution for file location
        std::vector<char> vertShaderCode;
        std::vector<char> fragShaderCode;
        try{
            vertShaderCode = readFile("shaders/shader.vert.spv");
            fragShaderCode = readFile("shaders/shader.frag.spv");
        }
        catch(std::exception e){
            std::cout << "Failed to read ./shaders/...\nTrying fallback folders!\n";
            vertShaderCode = readFile("../shaders/shader.vert.spv");
            fragShaderCode = readFile("../shaders/shader.frag.spv");
        }

        VkShaderModule vertShaderModule = createShaderModule(vertShaderCode);
        VkShaderModule fragShaderModule = createShaderModule(fragShaderCode);

        VkPipelineShaderStageCreateInfo vertShaderStageInfo{};
        vertShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
        vertShaderStageInfo.stage = VK_SHADER_STAGE_VERTEX_BIT;
        vertShaderStageInfo.module = vertShaderModule;
        vertShaderStageInfo.pName = "main";

        VkPipelineShaderStageCreateInfo fragShaderStageInfo{};
        fragShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
        fragShaderStageInfo.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
        fragShaderStageInfo.module = fragShaderModule;
        fragShaderStageInfo.pName = "main";

        VkPipelineShaderStageCreateInfo shaderStages[] = {vertShaderStageInfo, fragShaderStageInfo};

        // Dynamics are done to not reinitialize every pipeline for example resizes
        std::vector<VkDynamicState> dynamicStates = {
            VK_DYNAMIC_STATE_VIEWPORT,
            VK_DYNAMIC_STATE_SCISSOR,
        };

        VkPipelineDynamicStateCreateInfo dynamicState{};
        dynamicState.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
        dynamicState.dynamicStateCount = static_cast<uint32_t>(dynamicStates.size());
        dynamicState.pDynamicStates = dynamicStates.data();

        auto bindingDescription = Vertex::getBindingDescription();
        auto attributeDescription = Vertex::getAttributeDescriptions();

        VkPipelineVertexInputStateCreateInfo vertexInputInfo{};
        vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
        vertexInputInfo.vertexBindingDescriptionCount = 1;
        vertexInputInfo.vertexAttributeDescriptionCount = static_cast<uint32_t>(attributeDescription.size());
        vertexInputInfo.pVertexBindingDescriptions = &bindingDescription;
        vertexInputInfo.pVertexAttributeDescriptions = attributeDescription.data();

        VkPipelineInputAssemblyStateCreateInfo inputAssembly{};
        inputAssembly.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
        inputAssembly.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
        inputAssembly.primitiveRestartEnable = VK_FALSE;

        /*
        VkViewport viewport{};
        viewport.x = 0.0f;
        viewport.y = 0.0f;
        viewport.width = (float)swapChainExtent.width;
        viewport.height = (float)swapChainExtent.height;
        viewport.minDepth = 0.0f;
        viewport.maxDepth = 1.0f;
        vkCmdSetViewport(commandBuffer, 0, 1, &viewport);

        VkRect2D scissor{};
        scissor.offset = { 0, 0 };
        scissor.extent = swapChainExtent;
        vkCmdSetScissor(commandBuffer, 0, 1, &scissor);
        */

        VkPipelineViewportStateCreateInfo viewportState{};
        viewportState.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
        viewportState.viewportCount = 1;
        // viewportState.pViewports = &viewport; // possibly made immutable
        viewportState.scissorCount = 1;
        // viewportState.pScissors = &scissor; // possibly made immutable

        VkPipelineRasterizationStateCreateInfo rasterizer{};
        rasterizer.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
        rasterizer.depthClampEnable = VK_FALSE;
        rasterizer.rasterizerDiscardEnable = VK_FALSE;
        rasterizer.polygonMode = VK_POLYGON_MODE_FILL; // INFO: Other render effects
        rasterizer.lineWidth = 1.0f;
        rasterizer.cullMode = VK_CULL_MODE_BACK_BIT;
        // rasterizer.frontFace = VK_FRONT_FACE_CLOCKWISE; with descriptor sets this causes backface culling to occure
        rasterizer.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
        rasterizer.depthBiasEnable = VK_FALSE;

        VkPipelineMultisampleStateCreateInfo multisampling{};
        multisampling.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
        multisampling.sampleShadingEnable = VK_FALSE;
        multisampling.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;

        VkPipelineColorBlendAttachmentState colorBlendAttachment{};
        colorBlendAttachment.colorWriteMask = VK_COLOR_COMPONENT_R_BIT
            | VK_COLOR_COMPONENT_G_BIT
            | VK_COLOR_COMPONENT_B_BIT
            | VK_COLOR_COMPONENT_A_BIT;
        colorBlendAttachment.blendEnable = VK_TRUE;
        colorBlendAttachment.srcColorBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
        colorBlendAttachment.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
        colorBlendAttachment.colorBlendOp = VK_BLEND_OP_ADD;
        colorBlendAttachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
        colorBlendAttachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
        colorBlendAttachment.alphaBlendOp = VK_BLEND_OP_ADD;

        VkPipelineColorBlendStateCreateInfo colorBlending{};
        colorBlending.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
        colorBlending.logicOpEnable = VK_FALSE;
        colorBlending.attachmentCount = 1;
        colorBlending.pAttachments = &colorBlendAttachment;

        VkPipelineLayoutCreateInfo pipelineLayoutInfo{};
        pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
        pipelineLayoutInfo.setLayoutCount = 1;
        pipelineLayoutInfo.pSetLayouts = &descriptorSetLayout;

        if(vkCreatePipelineLayout(device, &pipelineLayoutInfo, nullptr, &pipelineLayout) != VK_SUCCESS){
            throw std::runtime_error("Func; createGraphicsPipeline\nError: Failed to create pipeline layout!\n");
        }

        VkGraphicsPipelineCreateInfo pipelineInfo{};
        pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
        pipelineInfo.stageCount = 2;
        // FINALLY REFERENCE ALL TOGETHER
        pipelineInfo.pStages = shaderStages;
        pipelineInfo.pVertexInputState = &vertexInputInfo;
        pipelineInfo.pInputAssemblyState = &inputAssembly;
        pipelineInfo.pViewportState = &viewportState;
        pipelineInfo.pRasterizationState = &rasterizer;
        pipelineInfo.pMultisampleState = &multisampling;
        pipelineInfo.pDepthStencilState = nullptr; // Optional because {} as initializer
        pipelineInfo.pColorBlendState = &colorBlending;
        pipelineInfo.pDynamicState = &dynamicState;
        pipelineInfo.layout = pipelineLayout;
        pipelineInfo.renderPass = renderPass;
        pipelineInfo.subpass = 0;

        /* Performance optimization entrypoint
        pipelineInfo.basePipelineIndex = -1;
        pipelineInfo.basePipelineHandle = VK_NULL_HANDLE;
         */

        if(vkCreateGraphicsPipelines(device, VK_NULL_HANDLE, 1, &pipelineInfo, nullptr, &graphicsPipeline) !=
            VK_SUCCESS){
            throw std::runtime_error("Func; createGraphicsPipeline\nError: Failed to create graphics pipeline!\n");
        }

        vkDestroyShaderModule(device, vertShaderModule, nullptr);
        vkDestroyShaderModule(device, fragShaderModule, nullptr);
    }

    VkShaderModule Vulkan::createShaderModule(const std::vector<char>& code){
        VkShaderModuleCreateInfo createInfo{};
        createInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
        createInfo.codeSize = code.size();
        createInfo.pCode = reinterpret_cast<const uint32_t*>(code.data());

        VkShaderModule shaderModule;
        if(vkCreateShaderModule(device, &createInfo, nullptr, &shaderModule) != VK_SUCCESS){
            throw std::runtime_error("Func: createShaderModule\nError: Failed to create Shader Module!\n");
        }

        return shaderModule;
    }

    void Vulkan::createRenderPass(){
        VkAttachmentDescription colorAttachment{};
        colorAttachment.format = swapChainImageFormat;
        colorAttachment.samples = VK_SAMPLE_COUNT_1_BIT;
        colorAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
        colorAttachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
        colorAttachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
        colorAttachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
        colorAttachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
        colorAttachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;

        VkAttachmentReference colorAttachmentRef{};
        colorAttachmentRef.attachment = 0;
        colorAttachmentRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;

        VkSubpassDescription subpass{};
        subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
        subpass.colorAttachmentCount = 1;
        subpass.pColorAttachments = &colorAttachmentRef;

        VkSubpassDependency dependency{};
        dependency.srcSubpass = VK_SUBPASS_EXTERNAL;
        dependency.dstSubpass = 0;
        dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
        dependency.srcAccessMask = 0;
        dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
        dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;

        VkRenderPassCreateInfo renderPassInfo{};
        renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
        renderPassInfo.attachmentCount = 1;
        renderPassInfo.pAttachments = &colorAttachment;
        renderPassInfo.subpassCount = 1;
        renderPassInfo.pSubpasses = &subpass;
        renderPassInfo.dependencyCount = 1;
        renderPassInfo.pDependencies = &dependency;

        if(vkCreateRenderPass(device, &renderPassInfo, nullptr, &renderPass) != VK_SUCCESS){
            throw std::runtime_error("Func: createRenderPass\nError: Failed to create render pass!\n");
        }
    }

    void Vulkan::createFrameBuffers(){
        swapChainFramebuffers.resize(swapChainImageViews.size());

        for(size_t i = 0; i < swapChainImageViews.size(); i++){
            VkImageView attachements[] = {swapChainImageViews[i]};

            VkFramebufferCreateInfo framebufferInfo{};
            framebufferInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
            framebufferInfo.renderPass = renderPass;
            framebufferInfo.attachmentCount = 1;
            framebufferInfo.pAttachments = attachements;
            framebufferInfo.width = swapChainExtent.width;
            framebufferInfo.height = swapChainExtent.height;
            framebufferInfo.layers = 1;

            if(vkCreateFramebuffer(device, &framebufferInfo, nullptr, &swapChainFramebuffers[i]) != VK_SUCCESS){
                throw std::runtime_error("Func: createFrameBuffers\nError: Failed to create Framebuffer!\n");
            }
        }
    }

    void Vulkan::createCommandPool(){
        QueueFamilyIndices queueFamilyIndices = findQueueFamilies(physicalDevice);
        VkCommandPoolCreateInfo poolInfo{};
        poolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
        poolInfo.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
        poolInfo.queueFamilyIndex = queueFamilyIndices.graphicsFamily.value();

        if(vkCreateCommandPool(device, &poolInfo, nullptr, &commandPool) != VK_SUCCESS){
            throw std::runtime_error("Func: createCommandPool\nError: Failed to create Command Pool!\n");
        }
    }

    VkCommandBuffer Vulkan::beginSingleTimeCommands(){
        VkCommandBufferAllocateInfo allocInfo{};
        allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
        allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
        allocInfo.commandPool = commandPool;
        allocInfo.commandBufferCount = 1;

        VkCommandBuffer commandBuffer;
        vkAllocateCommandBuffers(device, &allocInfo, &commandBuffer);

        VkCommandBufferBeginInfo beginInfo{};
        beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
        beginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;

        vkBeginCommandBuffer(commandBuffer, &beginInfo);

        return commandBuffer;
    }

    void Vulkan::endSingleTimeCommands(VkCommandBuffer commandBuffer){
        vkEndCommandBuffer(commandBuffer);

        VkSubmitInfo submitInfo{};
        submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
        submitInfo.commandBufferCount = 1;
        submitInfo.pCommandBuffers = &commandBuffer;

        vkQueueSubmit(graphicsQueue, 1, &submitInfo, VK_NULL_HANDLE);
        vkQueueWaitIdle(graphicsQueue);
        vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);
    }

    void Vulkan::copyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size){
        VkCommandBuffer commandBuffer = beginSingleTimeCommands();

        VkBufferCopy copyRegion{};
        copyRegion.size = size;
        vkCmdCopyBuffer(commandBuffer, srcBuffer, dstBuffer, 1, &copyRegion);

        endSingleTimeCommands(commandBuffer);
    }

    void Vulkan::transitionImageLayout(VkImage image, VkFormat format, VkImageLayout oldLayout, VkImageLayout newLayout){
        VkCommandBuffer commandBuffer = beginSingleTimeCommands();

        VkImageMemoryBarrier barrier{};
        barrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
        barrier.oldLayout = oldLayout;
        barrier.newLayout = newLayout;

        barrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
        barrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;

        barrier.image = image;

        barrier.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
        barrier.subresourceRange.baseMipLevel = 0;
        barrier.subresourceRange.levelCount = 1;
        barrier.subresourceRange.baseArrayLayer = 0;
        barrier.subresourceRange.layerCount = 1;

        VkPipelineStageFlags sourceStage;
        VkPipelineStageFlags destinationStage;

        if(oldLayout == VK_IMAGE_LAYOUT_UNDEFINED && newLayout == VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL){
            barrier.srcAccessMask = 0;
            barrier.dstAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;

            sourceStage = VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT;
            destinationStage = VK_PIPELINE_STAGE_TRANSFER_BIT;
        }
        else if(oldLayout == VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL && newLayout == VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL){
            barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
            barrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;

            sourceStage = VK_PIPELINE_STAGE_TRANSFER_BIT;
            destinationStage = VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT;
        }
        else{
            throw std::invalid_argument("Func: transitionImageLayout\nError: Unsupported Layout Transition!\n");
        }

        vkCmdPipelineBarrier(commandBuffer, sourceStage, destinationStage, 0, 0, nullptr, 0, nullptr, 1, &barrier);
        endSingleTimeCommands(commandBuffer);
    }

    void Vulkan::copyBufferToImage(VkBuffer buffer, VkImage image, uint32_t width, uint32_t height){
        VkCommandBuffer commandBuffer = beginSingleTimeCommands();

        VkBufferImageCopy region{};
        region.bufferOffset = 0;
        region.bufferRowLength = 0;
        region.bufferImageHeight = 0;

        region.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
        region.imageSubresource.mipLevel = 0;
        region.imageSubresource.baseArrayLayer = 0;
        region.imageSubresource.layerCount = 1;

        region.imageOffset = { 0, 0, 0 };
        region.imageExtent = { width, height, 1 };

        vkCmdCopyBufferToImage(commandBuffer, buffer, image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &region);
        endSingleTimeCommands(commandBuffer);
    }

    void Vulkan::createImage(uint32_t width, uint32_t height, VkFormat format, VkImageTiling tiling, VkImageUsageFlags usage, VkMemoryPropertyFlags properties, VkImage& image, VkDeviceMemory &imageMemory){
        VkImageCreateInfo imageInfo{};
        imageInfo.sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO;
        imageInfo.imageType = VK_IMAGE_TYPE_2D; // 3D is used to store voxel volumes
        imageInfo.extent.width = width;
        imageInfo.extent.height = height;
        imageInfo.extent.depth = 1;
        imageInfo.mipLevels = 1;
        imageInfo.arrayLayers = 1;
        imageInfo.format = format;
        imageInfo.tiling = tiling; // or LINEAR for direct memory access of texels, OPTIMAL provides efficient access from shader
        imageInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
        imageInfo.usage = usage;
        imageInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
        imageInfo.samples = VK_SAMPLE_COUNT_1_BIT;
        imageInfo.flags = 0; // something tells me this has another value when using voxels

        if(vkCreateImage(device, &imageInfo, nullptr, &image) != VK_SUCCESS){
            throw std::runtime_error("Func: createTextureImage\nError: Failed to create Image!\n");
        }

        VkMemoryRequirements memRequirements;
        vkGetImageMemoryRequirements(device, image, &memRequirements);

        VkMemoryAllocateInfo allocInfo{};
        allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
        allocInfo.allocationSize = memRequirements.size;
        allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, properties);

        if(vkAllocateMemory(device, &allocInfo, nullptr, &imageMemory) != VK_SUCCESS){
            throw std::runtime_error("Func: createTextureImage\nError: Failed to allocate memory for Image!\n");
        }

        vkBindImageMemory(device, image, imageMemory, 0);
    }

    void Vulkan::createTextureImage(){
        int texWidth, texHeight, texChannels;
        stbi_uc *pixels = stbi_load("textures/texture.jpeg", &texWidth, &texHeight, &texChannels, STBI_rgb_alpha);
        VkDeviceSize imageSize = texWidth * texHeight * 4; // 4 bytes per pixel

        if(!pixels) throw std::runtime_error("Func: createTextureImage\nError: Failed to load Texture Image!\n");

        VkBuffer stagingBuffer;
        VkDeviceMemory stagingBufferMemory;

        createBuffer(imageSize, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, stagingBuffer, stagingBufferMemory);

        void *data;
        vkMapMemory(device, stagingBufferMemory, 0, imageSize, 0, &data);
        memcpy(data, pixels, static_cast<size_t>(imageSize));
        vkUnmapMemory(device, stagingBufferMemory);

        stbi_image_free(pixels);

        createImage(texWidth, texHeight, VK_FORMAT_R8G8B8A8_SRGB, VK_IMAGE_TILING_OPTIMAL, VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_SAMPLED_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, textureImage, textureImageMemory);
        transitionImageLayout(textureImage, VK_FORMAT_R8G8B8A8_SRGB, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);
        copyBufferToImage(stagingBuffer, textureImage, static_cast<uint32_t>(texWidth), static_cast<uint32_t>(texHeight));
        transitionImageLayout(textureImage, VK_FORMAT_R8G8B8A8_SRGB, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
        vkDestroyBuffer(device, stagingBuffer, nullptr);
        vkFreeMemory(device, stagingBufferMemory, nullptr);
    }

    VkImageView Vulkan::createImageView(VkImage image, VkFormat format){
        VkImageViewCreateInfo viewInfo{};
        viewInfo.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
        viewInfo.image = image;
        viewInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
        viewInfo.format = VK_FORMAT_R8G8B8A8_SRGB;
        viewInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
        viewInfo.subresourceRange.baseMipLevel = 0;
        viewInfo.subresourceRange.levelCount = 1;
        viewInfo.subresourceRange.baseArrayLayer = 0;
        viewInfo.subresourceRange.layerCount = 1;

        VkImageView imageView;
        if(vkCreateImageView(device, &viewInfo, nullptr, &imageView) != VK_SUCCESS){
            throw std::runtime_error("Func: createTextureImageView\nError: Failed to create Texture Image View!\n");
        }

        return imageView;
    }

    void Vulkan::createTextureImageView(){
        textureImageView = createImageView(textureImage, VK_FORMAT_R8G8B8A8_SRGB);
    }

    void Vulkan::createTextureSampler(){
        VkSamplerCreateInfo samplerInfo{};
        samplerInfo.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
        samplerInfo.magFilter = VK_FILTER_LINEAR;
        samplerInfo.minFilter = VK_FILTER_LINEAR;

        // INFO: Here can preferences be used -> instead of REPEAT I use CLAMP_TO_EDGE to get this nice eye cancer
        samplerInfo.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
        samplerInfo.addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
        samplerInfo.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;

        // INFO: filter user preferences here
        samplerInfo.anisotropyEnable = VK_TRUE;

        VkPhysicalDeviceProperties properties{};
        vkGetPhysicalDeviceProperties(physicalDevice, &properties);

        samplerInfo.maxAnisotropy = properties.limits.maxSamplerAnisotropy;

        samplerInfo.borderColor = VK_BORDER_COLOR_INT_OPAQUE_BLACK;
        samplerInfo.unnormalizedCoordinates = VK_FALSE;
        samplerInfo.compareEnable = VK_FALSE;
        samplerInfo.compareOp = VK_COMPARE_OP_ALWAYS;
        samplerInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
        samplerInfo.mipLodBias = 0.0f;
        samplerInfo.minLod = 0.0f;
        samplerInfo.maxLod = 0.0f;

        if(vkCreateSampler(device, &samplerInfo, nullptr, &textureSampler) != VK_SUCCESS){
            throw std::runtime_error("Func: createTextureSampler\nError: Failed to create Texture Sampler!\n");
        }
    }

    uint32_t Vulkan::findMemoryType(uint32_t typeFilter, VkMemoryPropertyFlags properties){
        VkPhysicalDeviceMemoryProperties memProperties;
        vkGetPhysicalDeviceMemoryProperties(physicalDevice, &memProperties);
        for(uint32_t i = 0; i < memProperties.memoryTypeCount; i++){
            if(typeFilter & (1 << i) && (memProperties.memoryTypes[i].propertyFlags & properties) == properties) return i;
        }

        throw std::runtime_error("Func: findMemoryType\nError: Failed to find suitable memory type!\n");
    }

    void Vulkan::createBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VkBuffer &buffer, VkDeviceMemory &bufferMemory){
        VkBufferCreateInfo bufferInfo{};
        bufferInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
        bufferInfo.size = size;
        bufferInfo.usage = usage;
        bufferInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;

        if(vkCreateBuffer(device, &bufferInfo, nullptr, &buffer) != VK_SUCCESS){
            throw std::runtime_error("Func: createBuffer\nError: Failed to create buffer!\n");
        }

        VkMemoryRequirements memRequirements;
        vkGetBufferMemoryRequirements(device, buffer, &memRequirements);

        VkMemoryAllocateInfo allocInfo{};
        allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
        allocInfo.allocationSize = memRequirements.size;
        allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, properties);

        // TODO: switch vkAllocateMemory with own implementation or GPUOpen's VulkanMemoryAllocator
        if(vkAllocateMemory(device, &allocInfo, nullptr, &bufferMemory) != VK_SUCCESS){
            throw std::runtime_error("Func: createBuffer\nError: Failed to allocate memory for buffer!\n");
        }

        vkBindBufferMemory(device, buffer, bufferMemory, 0);
    }

    void Vulkan::copyBufferOld(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size){
        VkCommandBufferAllocateInfo allocInfo{};
        allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
        allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
        allocInfo.commandPool = commandPool;
        allocInfo.commandBufferCount = 1;

        VkCommandBuffer commandBuffer;
        vkAllocateCommandBuffers(device, &allocInfo, &commandBuffer);

        VkCommandBufferBeginInfo beginInfo{};
        beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
        beginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;

        vkBeginCommandBuffer(commandBuffer, &beginInfo);

        VkBufferCopy copyRegion{};
        copyRegion.size = size;

        vkCmdCopyBuffer(commandBuffer, srcBuffer, dstBuffer, 1, &copyRegion);

        vkEndCommandBuffer(commandBuffer);

        VkSubmitInfo submitInfo{};
        submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
        submitInfo.commandBufferCount = 1;
        submitInfo.pCommandBuffers = &commandBuffer;

        vkQueueSubmit(graphicsQueue, 1, &submitInfo, VK_NULL_HANDLE);
        vkQueueWaitIdle(graphicsQueue);

        vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);
    }

    void Vulkan::createVertexBuffer(){
        VkDeviceSize bufferSize = sizeof(vertices[0]) * vertices.size();

        VkBuffer stagingBuffer;
        VkDeviceMemory stagingBufferMemory;

        createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, stagingBuffer, stagingBufferMemory);

        void *data;
        vkMapMemory(device, stagingBufferMemory, 0, bufferSize, 0, &data);
        memcpy(data, vertices.data(), (size_t)bufferSize);
        vkUnmapMemory(device, stagingBufferMemory);

        createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, vertexBuffer, vertexBufferMemory);

        copyBuffer(stagingBuffer, vertexBuffer, bufferSize);

        vkDestroyBuffer(device, stagingBuffer, nullptr);
        vkFreeMemory(device, stagingBufferMemory, nullptr);
    }

    void Vulkan::createIndexBuffer(){
        VkDeviceSize bufferSize = sizeof(indices[0]) * indices.size();

        VkBuffer stagingBuffer;
        VkDeviceMemory stagingBufferMemory;

        createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, stagingBuffer, stagingBufferMemory);

        void *data;
        vkMapMemory(device, stagingBufferMemory, 0, bufferSize, 0, &data);
        memcpy(data, indices.data(), (size_t)bufferSize);
        vkUnmapMemory(device, stagingBufferMemory);

        createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_INDEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, indexBuffer, indexBufferMemory);

        copyBuffer(stagingBuffer, indexBuffer, bufferSize);

        vkDestroyBuffer(device, stagingBuffer, nullptr);
        vkFreeMemory(device, stagingBufferMemory, nullptr);
    }

    void Vulkan::createUniformBuffers(){
        VkDeviceSize bufferSize = sizeof(UniformBufferObject);

        uniformBuffers.resize(MAX_FRAMES_IN_FLIGHT);
        uniformBuffersMemory.resize(MAX_FRAMES_IN_FLIGHT);
        uniformBuffersMapped.resize(MAX_FRAMES_IN_FLIGHT);

        for(size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++){
            createBuffer(bufferSize, VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, uniformBuffers[i], uniformBuffersMemory[i]);
            vkMapMemory(device, uniformBuffersMemory[i], 0, bufferSize, 0, &uniformBuffersMapped[i]);
        }
    }

    void Vulkan::createDescriptorPool(){
        VkDescriptorPoolSize poolSize{};
        poolSize.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
        poolSize.descriptorCount = static_cast<uint32_t>(MAX_FRAMES_IN_FLIGHT);

        VkDescriptorPoolCreateInfo poolInfo{};
        poolInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
        poolInfo.poolSizeCount = 1;
        poolInfo.pPoolSizes = &poolSize;
        poolInfo.maxSets = static_cast<uint32_t>(MAX_FRAMES_IN_FLIGHT);

        if(vkCreateDescriptorPool(device, &poolInfo, nullptr, &descriptorPool) != VK_SUCCESS){
            throw std::runtime_error("Func: createDescriptorPool\nError: Failed to create Descriptor Pool!\n");
        }
    }

    void Vulkan::createDescriptorSets(){
        std::vector<VkDescriptorSetLayout> layouts(MAX_FRAMES_IN_FLIGHT, descriptorSetLayout);

        VkDescriptorSetAllocateInfo allocInfo{};
        allocInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
        allocInfo.descriptorPool = descriptorPool;
        allocInfo.descriptorSetCount = static_cast<uint32_t>(MAX_FRAMES_IN_FLIGHT);
        allocInfo.pSetLayouts = layouts.data();

        descriptorSets.resize(MAX_FRAMES_IN_FLIGHT);

        if(vkAllocateDescriptorSets(device, &allocInfo, descriptorSets.data()) != VK_SUCCESS){
            throw std::runtime_error("Func: createDescriptorSets\nError: Failed to allocate Descriptor Sets!\n");
        }

        for(size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++){
            VkDescriptorBufferInfo bufferInfo{};
            bufferInfo.buffer = uniformBuffers[i];
            bufferInfo.offset = 0;
            bufferInfo.range = sizeof(UniformBufferObject);

            VkWriteDescriptorSet descriptorWrite{};
            descriptorWrite.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
            descriptorWrite.dstSet = descriptorSets[i];
            descriptorWrite.dstBinding = 0;
            descriptorWrite.dstArrayElement = 0;

            descriptorWrite.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
            descriptorWrite.descriptorCount = 1;

            descriptorWrite.pBufferInfo = &bufferInfo;

            vkUpdateDescriptorSets(device, 1, &descriptorWrite, 0, nullptr);
        }
    }

    void Vulkan::createCommandBuffers(){
        commandBuffers.resize(MAX_FRAMES_IN_FLIGHT);

        VkCommandBufferAllocateInfo allocInfo{};
        allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
        allocInfo.commandPool = commandPool;
        allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
        allocInfo.commandBufferCount = (uint32_t)commandBuffers.size();

        if(vkAllocateCommandBuffers(device, &allocInfo, commandBuffers.data()) != VK_SUCCESS){
            throw std::runtime_error("Func: createCommandBuffer\nError: Failed to allocate Command Buffers!\n");
        }
    }

    void Vulkan::recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex){
        VkCommandBufferBeginInfo beginInfo{};
        beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;

        if(vkBeginCommandBuffer(commandBuffer, &beginInfo) != VK_SUCCESS){
            throw std::runtime_error("Func: recordCommandBuffer\nError: Failed to begin recording command buffer!\n");
        }

        VkRenderPassBeginInfo renderPassInfo{};
        renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
        renderPassInfo.renderPass = renderPass;
        renderPassInfo.framebuffer = swapChainFramebuffers[imageIndex];
        renderPassInfo.renderArea.offset = {0, 0};
        renderPassInfo.renderArea.extent = swapChainExtent;

        VkClearValue clearColor = {{{0.01f, 0.01f, 0.01f, 1.0f}}}; // Background color after clear (Black 100%)
        renderPassInfo.clearValueCount = 1;
        renderPassInfo.pClearValues = &clearColor;

        vkCmdBeginRenderPass(commandBuffer, &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);
        vkCmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, graphicsPipeline);

        VkBuffer vertexBuffers[] = { vertexBuffer };
        VkDeviceSize offsets[] = { 0 };
        vkCmdBindVertexBuffers(commandBuffer, 0, 1, vertexBuffers, offsets);

        vkCmdBindIndexBuffer(commandBuffer, indexBuffer, 0, VK_INDEX_TYPE_UINT32);

        VkViewport viewport{};
        viewport.x = 0.0f;
        viewport.y = 0.0f;
        viewport.width = (float)swapChainExtent.width;
        viewport.height = (float)swapChainExtent.height;
        viewport.minDepth = 0.0f;
        viewport.maxDepth = 1.0f;
        vkCmdSetViewport(commandBuffer, 0, 1, &viewport);

        VkRect2D scissor{};
        scissor.offset = {0, 0};
        scissor.extent = swapChainExtent;
        vkCmdSetScissor(commandBuffer, 0, 1, &scissor);

        vkCmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets[currentFrame], 0, nullptr);

        // vkCmdDraw(commandBuffer, static_cast<uint32_t>(vertices.size()), 1, 0, 0);
        // -> goto indexed draw
        vkCmdDrawIndexed(commandBuffer, static_cast<uint32_t>(indices.size()), 1, 0, 0, 0);

        vkCmdEndRenderPass(commandBuffer);
        if(vkEndCommandBuffer(commandBuffer) != VK_SUCCESS){
            throw std::runtime_error("Func: recordCommandBuffer\nError: Failed to record command buffer!\n");
        }
    }

    void Vulkan::createSyncObjects(){
        imageAvailableSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
        renderFinishedSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
        inFlightFences.resize(MAX_FRAMES_IN_FLIGHT);

        VkSemaphoreCreateInfo semaphoreInfo{};
        semaphoreInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;

        VkFenceCreateInfo fenceInfo{};
        fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
        fenceInfo.flags = VK_FENCE_CREATE_SIGNALED_BIT;

        for(size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++){
            if(vkCreateSemaphore(device, &semaphoreInfo, nullptr, &imageAvailableSemaphores[i]) != VK_SUCCESS
                || vkCreateSemaphore(device, &semaphoreInfo, nullptr, &renderFinishedSemaphores[i]) != VK_SUCCESS
                || vkCreateFence(device, &fenceInfo, nullptr, &inFlightFences[i]) != VK_SUCCESS){
                throw std::runtime_error("Func: createSyncObjects\nError: Failed to create semaphores!\n");
            }
        }
    }

    void Vulkan::updateUniformBuffer(uint32_t currentFrame){
        static auto startTime = std::chrono::high_resolution_clock::now();

        auto currentTime = std::chrono::high_resolution_clock::now();
        float time = std::chrono::duration<float, std::chrono::seconds::period>(currentTime - startTime).count();

        // to not pass rotation over time instead by fps
        // float time = (currentTime - startTime).count();

        UniformBufferObject ubo{};
        // INFO: Change here for other angles
        ubo.model = glm::rotate(glm::mat4(1.0f), time * glm::radians(60.0f), glm::vec3(0.2f, 0.2f, 0.8f));
        ubo.view = glm::lookAt(glm::vec3(2.0f, 2.0f, 2.0f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f));
        ubo.proj = glm::perspective(glm::radians(45.0f), swapChainExtent.width / (float)swapChainExtent.height, 0.1f, 10.0f);

        // removing this line results in the image rendering upside down
        ubo.proj[1][1] *= -1;

        memcpy(uniformBuffersMapped[currentFrame], &ubo, sizeof(ubo));
    }

    void Vulkan::drawFrame(){
        vkWaitForFences(device, 1, &inFlightFences[currentFrame], VK_TRUE, UINT64_MAX);
        vkResetFences(device, 1, &inFlightFences[currentFrame]);

        uint32_t imageIndex;
        VkResult result = vkAcquireNextImageKHR(device, swapChain, UINT64_MAX, imageAvailableSemaphores[currentFrame], VK_NULL_HANDLE, &imageIndex);

        // INFO: is this right here?
        // vkResetFences(device, 1, &inFlightFences[currentFrame]);

        vkResetCommandBuffer(commandBuffers[currentFrame], 0);
        recordCommandBuffer(commandBuffers[currentFrame], imageIndex);

        updateUniformBuffer(currentFrame);

        VkSubmitInfo submitInfo{};
        submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;

        VkSemaphore waitSemaphores[] = {imageAvailableSemaphores[currentFrame]};
        VkPipelineStageFlags waitStages[] = {VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT};

        submitInfo.waitSemaphoreCount = 1;
        submitInfo.pWaitSemaphores = waitSemaphores;
        submitInfo.pWaitDstStageMask = waitStages;
        submitInfo.commandBufferCount = 1;
        submitInfo.pCommandBuffers = &commandBuffers[currentFrame];

        VkSemaphore signalSemaphore[] = {renderFinishedSemaphores[currentFrame]};
        submitInfo.signalSemaphoreCount = 1;
        submitInfo.pSignalSemaphores = signalSemaphore;

        if(vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]) != VK_SUCCESS){
            throw std::runtime_error("Func: drawFrame\nError: Failed to submit draw command buffer!\n");
        }

        VkPresentInfoKHR presentInfo{};
        presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
        presentInfo.waitSemaphoreCount = 1;
        presentInfo.pWaitSemaphores = signalSemaphore;

        VkSwapchainKHR swapChains[] = {swapChain};
        presentInfo.swapchainCount = 1;
        presentInfo.pSwapchains = swapChains;
        presentInfo.pImageIndices = &imageIndex;

        vkQueuePresentKHR(presentQueue, &presentInfo);

        if(result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR || framebufferResized){
            framebufferResized = false;
            recreateSwapChain();
        }
        else if(result != VK_SUCCESS){
            throw std::runtime_error("Func: drawFrame\nError: Failed to acquire swap chain image!\n");
        }

        currentFrame = (currentFrame + 1) % MAX_FRAMES_IN_FLIGHT;
    }

    void Vulkan::cleanupSwapChain(){
        for(const auto & swapChainFramebuffer : swapChainFramebuffers)
            { vkDestroyFramebuffer(device, swapChainFramebuffer, nullptr); }
        for(const auto & swapChainImageView : swapChainImageViews)
            { vkDestroyImageView(device, swapChainImageView, nullptr); }

        vkDestroySwapchainKHR(device, swapChain, nullptr);
    }

    void Vulkan::recreateSwapChain(){
        int width = 0, height = 0;
        glfwGetFramebufferSize(window, &width, &height);
        while(width == 0 || height == 0){
            glfwGetFramebufferSize(window, &width, &height);
            glfwPollEvents();
        }

        vkDeviceWaitIdle(device);

        cleanupSwapChain();

        createSwapChain();
        createImageViews();
        createFrameBuffers();
    }

    static void framebufferResizeCallback(GLFWwindow *window, int width, int height){
        auto app = reinterpret_cast<Vulkan*>(glfwGetWindowUserPointer(window));
        app->framebufferResized = true;
    }

    void Vulkan::initWindow(const char *windowName){
        glfwInit();
        glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API); // tell glfw to not use opengl
        glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE); // disable window resize
        this->window = glfwCreateWindow(static_cast<int>(_width), static_cast<int>(_height), windowName, nullptr, nullptr);
        glfwSetWindowUserPointer(window, this);
        glfwSetFramebufferSizeCallback(window, framebufferResizeCallback);
    }

    void Vulkan::initVulkan(){
        createInstance();
        setupDebugMessenger();
        createSurface();
        pickPhysicalDevice();
        createLogicalDevice();
        createSwapChain();
        createImageViews();
        createRenderPass();
        createDescriptorSetLayout();
        createGraphicsPipeline();
        createFrameBuffers();
        createCommandPool();
        createTextureImage();
        createTextureImageView();
        createTextureSampler();
        createVertexBuffer();
        createIndexBuffer();
        createUniformBuffers();
        createDescriptorPool();
        createDescriptorSets();
        createCommandBuffers();
        createSyncObjects();
    }

    void Vulkan::mainLoop(){
        while(!glfwWindowShouldClose(this->window)){
            // glfwSwapBuffers(window);
            glfwPollEvents();
            drawFrame();
        }
        vkDeviceWaitIdle(device);
    }

    void Vulkan::cleanup(){
        // Vulkan
        cleanupSwapChain();

        vkDestroySampler(device, textureSampler, nullptr);
        vkDestroyImageView(device, textureImageView, nullptr);

        vkDestroyImage(device, textureImage, nullptr);
        vkFreeMemory(device, textureImageMemory, nullptr);

        for(size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++){
            vkDestroyBuffer(device, uniformBuffers[i], nullptr);
            vkFreeMemory(device, uniformBuffersMemory[i], nullptr);
        }

        vkDestroyDescriptorPool(device, descriptorPool, nullptr);

        vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);

        vkDestroyBuffer(device, indexBuffer, nullptr);
        vkFreeMemory(device, indexBufferMemory, nullptr);

        vkDestroyBuffer(device, vertexBuffer, nullptr);
        vkFreeMemory(device, vertexBufferMemory, nullptr);

        vkDestroyPipeline(device, graphicsPipeline, nullptr);
        vkDestroyPipelineLayout(device, pipelineLayout, nullptr);

        vkDestroyRenderPass(device, renderPass, nullptr);

        for(size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++){
            vkDestroySemaphore(device, imageAvailableSemaphores[i], nullptr);
            vkDestroySemaphore(device, renderFinishedSemaphores[i], nullptr);
            vkDestroyFence(device, inFlightFences[i], nullptr);
        }

        vkDestroyCommandPool(device, commandPool, nullptr);

        vkDestroyDevice(device, nullptr);

        if(enableValidationLayers){
            DestroyDebugUtilsMessengerEXT(instance, debugMessenger, nullptr);
        }

        vkDestroySurfaceKHR(instance, surface, nullptr);
        vkDestroyInstance(instance, nullptr);

        vkDestroyInstance(instance, nullptr);

        // GLFW
        glfwDestroyWindow(this->window);
        glfwTerminate();
    }

    void Vulkan::run(const char *windowName, const uint32_t width, const uint32_t height){
        this->_width = width;
        this->_height = height;

        initWindow(windowName);
        initVulkan();
        mainLoop();
        cleanup();
    }
}