// Copyright(c) 2018-2019, NVIDIA CORPORATION. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// VulkanHpp Samples : 05_InitSwapchain
//                     Initialize a swapchain

#include "../utils/utils.hpp"
#include "vulkan/vulkan.hpp"

#include <iostream>

static char const * AppName    = "05_InitSwapchain";
static char const * EngineName = "Vulkan.hpp";

int main( int /*argc*/, char ** /*argv*/ )
{
  try
  {
    vk::Instance instance = vk::su::createInstance( AppName, EngineName, {}, vk::su::getInstanceExtensions() );
#if !defined( NDEBUG )
    vk::DebugUtilsMessengerEXT debugUtilsMessenger =
      instance.createDebugUtilsMessengerEXT( vk::su::makeDebugUtilsMessengerCreateInfoEXT() );
#endif

    vk::PhysicalDevice physicalDevice = instance.enumeratePhysicalDevices().front();

    std::vector<vk::QueueFamilyProperties> queueFamilyProperties = physicalDevice.getQueueFamilyProperties();
    uint32_t graphicsQueueFamilyIndex = vk::su::findGraphicsQueueFamilyIndex( queueFamilyProperties );

    /* VULKAN_HPP_KEY_START */

    uint32_t           width  = 64;
    uint32_t           height = 64;
    vk::su::WindowData window = vk::su::createWindow( AppName, { width, height } );
    vk::SurfaceKHR     surface;
    {
      VkSurfaceKHR _surface;
      glfwCreateWindowSurface( static_cast<VkInstance>( instance ), window.handle, nullptr, &_surface );
      surface = vk::SurfaceKHR( _surface );
    }

    // determine a queueFamilyIndex that suports present
    // first check if the graphicsQueueFamiliyIndex is good enough
    size_t presentQueueFamilyIndex =
      physicalDevice.getSurfaceSupportKHR( static_cast<uint32_t>( graphicsQueueFamilyIndex ), surface )
        ? graphicsQueueFamilyIndex
        : queueFamilyProperties.size();
    if ( presentQueueFamilyIndex == queueFamilyProperties.size() )
    {
      // the graphicsQueueFamilyIndex doesn't support present -> look for an other family index that supports both
      // graphics and present
      for ( size_t i = 0; i < queueFamilyProperties.size(); i++ )
      {
        if ( ( queueFamilyProperties[i].queueFlags & vk::QueueFlagBits::eGraphics ) &&
             physicalDevice.getSurfaceSupportKHR( static_cast<uint32_t>( i ), surface ) )
        {
          graphicsQueueFamilyIndex = vk::su::checked_cast<uint32_t>( i );
          presentQueueFamilyIndex  = i;
          break;
        }
      }
      if ( presentQueueFamilyIndex == queueFamilyProperties.size() )
      {
        // there's nothing like a single family index that supports both graphics and present -> look for an other
        // family index that supports present
        for ( size_t i = 0; i < queueFamilyProperties.size(); i++ )
        {
          if ( physicalDevice.getSurfaceSupportKHR( static_cast<uint32_t>( i ), surface ) )
          {
            presentQueueFamilyIndex = i;
            break;
          }
        }
      }
    }
    if ( ( graphicsQueueFamilyIndex == queueFamilyProperties.size() ) ||
         ( presentQueueFamilyIndex == queueFamilyProperties.size() ) )
    {
      throw std::runtime_error( "Could not find a queue for graphics or present -> terminating" );
    }

    // create a device
    vk::Device device = vk::su::createDevice( physicalDevice, graphicsQueueFamilyIndex, vk::su::getDeviceExtensions() );

    // get the supported VkFormats
    std::vector<vk::SurfaceFormatKHR> formats = physicalDevice.getSurfaceFormatsKHR( surface );
    assert( !formats.empty() );
    vk::Format format =
      ( formats[0].format == vk::Format::eUndefined ) ? vk::Format::eB8G8R8A8Unorm : formats[0].format;

    vk::SurfaceCapabilitiesKHR surfaceCapabilities = physicalDevice.getSurfaceCapabilitiesKHR( surface );
    VkExtent2D                 swapchainExtent;
    if ( surfaceCapabilities.currentExtent.width == std::numeric_limits<uint32_t>::max() )
    {
      // If the surface size is undefined, the size is set to the size of the images requested.
      swapchainExtent.width =
        vk::su::clamp( width, surfaceCapabilities.minImageExtent.width, surfaceCapabilities.maxImageExtent.width );
      swapchainExtent.height =
        vk::su::clamp( height, surfaceCapabilities.minImageExtent.height, surfaceCapabilities.maxImageExtent.height );
    }
    else
    {
      // If the surface size is defined, the swap chain size must match
      swapchainExtent = surfaceCapabilities.currentExtent;
    }

    // The FIFO present mode is guaranteed by the spec to be supported
    vk::PresentModeKHR swapchainPresentMode = vk::PresentModeKHR::eFifo;

    vk::SurfaceTransformFlagBitsKHR preTransform =
      ( surfaceCapabilities.supportedTransforms & vk::SurfaceTransformFlagBitsKHR::eIdentity )
        ? vk::SurfaceTransformFlagBitsKHR::eIdentity
        : surfaceCapabilities.currentTransform;

    vk::CompositeAlphaFlagBitsKHR compositeAlpha =
      ( surfaceCapabilities.supportedCompositeAlpha & vk::CompositeAlphaFlagBitsKHR::ePreMultiplied )
        ? vk::CompositeAlphaFlagBitsKHR::ePreMultiplied
      : ( surfaceCapabilities.supportedCompositeAlpha & vk::CompositeAlphaFlagBitsKHR::ePostMultiplied )
        ? vk::CompositeAlphaFlagBitsKHR::ePostMultiplied
      : ( surfaceCapabilities.supportedCompositeAlpha & vk::CompositeAlphaFlagBitsKHR::eInherit )
        ? vk::CompositeAlphaFlagBitsKHR::eInherit
        : vk::CompositeAlphaFlagBitsKHR::eOpaque;

    vk::SwapchainCreateInfoKHR swapChainCreateInfo( vk::SwapchainCreateFlagsKHR(),
                                                    surface,
                                                    surfaceCapabilities.minImageCount,
                                                    format,
                                                    vk::ColorSpaceKHR::eSrgbNonlinear,
                                                    swapchainExtent,
                                                    1,
                                                    vk::ImageUsageFlagBits::eColorAttachment,
                                                    vk::SharingMode::eExclusive,
                                                    {},
                                                    preTransform,
                                                    compositeAlpha,
                                                    swapchainPresentMode,
                                                    true,
                                                    nullptr );

    uint32_t queueFamilyIndices[2] = { static_cast<uint32_t>( graphicsQueueFamilyIndex ),
                                       static_cast<uint32_t>( presentQueueFamilyIndex ) };
    if ( graphicsQueueFamilyIndex != presentQueueFamilyIndex )
    {
      // If the graphics and present queues are from different queue families, we either have to explicitly transfer
      // ownership of images between the queues, or we have to create the swapchain with imageSharingMode as
      // VK_SHARING_MODE_CONCURRENT
      swapChainCreateInfo.imageSharingMode      = vk::SharingMode::eConcurrent;
      swapChainCreateInfo.queueFamilyIndexCount = 2;
      swapChainCreateInfo.pQueueFamilyIndices   = queueFamilyIndices;
    }

    vk::SwapchainKHR swapChain = device.createSwapchainKHR( swapChainCreateInfo );

    std::vector<vk::Image> swapChainImages = device.getSwapchainImagesKHR( swapChain );

    std::vector<vk::ImageView> imageViews;
    imageViews.reserve( swapChainImages.size() );
    vk::ImageViewCreateInfo imageViewCreateInfo(
      {}, {}, vk::ImageViewType::e2D, format, {}, { vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1 } );
    for ( auto image : swapChainImages )
    {
      imageViewCreateInfo.image = image;
      imageViews.push_back( device.createImageView( imageViewCreateInfo ) );
    }

    // destroy the imageViews, the swapChain,and the surface
    for ( auto & imageView : imageViews )
    {
      device.destroyImageView( imageView );
    }
    device.destroySwapchainKHR( swapChain );
    instance.destroySurfaceKHR( surface );

    /* VULKAN_HPP_KEY_END */

    device.destroy();
#if !defined( NDEBUG )
    instance.destroyDebugUtilsMessengerEXT( debugUtilsMessenger );
#endif
    instance.destroy();
  }
  catch ( vk::SystemError & err )
  {
    std::cout << "vk::SystemError: " << err.what() << std::endl;
    exit( -1 );
  }
  catch ( std::exception & err )
  {
    std::cout << "std::exception: " << err.what() << std::endl;
    exit( -1 );
  }
  catch ( ... )
  {
    std::cout << "unknown error\n";
    exit( -1 );
  }
  return 0;
}