#pragma once

// Copyright(c) 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.
//

#include <vulkan/vulkan.hpp>

#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#include <iostream>
#include <limits>
#include <map>
#include <memory>  // std::unique_ptr

namespace vk
{
  namespace su
  {
    const uint64_t FenceTimeout = 100000000;

    template <typename Func>
    void oneTimeSubmit( vk::CommandBuffer const & commandBuffer, vk::Queue const & queue, Func const & func )
    {
      commandBuffer.begin( vk::CommandBufferBeginInfo( vk::CommandBufferUsageFlagBits::eOneTimeSubmit ) );
      func( commandBuffer );
      commandBuffer.end();
      queue.submit( vk::SubmitInfo( 0, nullptr, nullptr, 1, &commandBuffer ), nullptr );
      queue.waitIdle();
    }

    template <typename Func>
    void oneTimeSubmit( vk::Device const & device, vk::CommandPool const & commandPool, vk::Queue const & queue, Func const & func )
    {
      vk::CommandBuffer commandBuffer =
        device.allocateCommandBuffers( vk::CommandBufferAllocateInfo( commandPool, vk::CommandBufferLevel::ePrimary, 1 ) ).front();
      oneTimeSubmit( commandBuffer, queue, func );
    }

    template <class T>
    void copyToDevice( vk::Device const & device, vk::DeviceMemory const & deviceMemory, T const * pData, size_t count, vk::DeviceSize stride = sizeof( T ) )
    {
      assert( sizeof( T ) <= stride );
      uint8_t * deviceData = static_cast<uint8_t *>( device.mapMemory( deviceMemory, 0, count * stride ) );
      if ( stride == sizeof( T ) )
      {
        memcpy( deviceData, pData, count * sizeof( T ) );
      }
      else
      {
        for ( size_t i = 0; i < count; i++ )
        {
          memcpy( deviceData, &pData[i], sizeof( T ) );
          deviceData += stride;
        }
      }
      device.unmapMemory( deviceMemory );
    }

    template <class T>
    void copyToDevice( vk::Device const & device, vk::DeviceMemory const & deviceMemory, T const & data )
    {
      copyToDevice<T>( device, deviceMemory, &data, 1 );
    }

    template <class T>
    VULKAN_HPP_INLINE constexpr const T & clamp( const T & v, const T & lo, const T & hi )
    {
      return v < lo ? lo : hi < v ? hi : v;
    }

    void setImageLayout(
      vk::CommandBuffer const & commandBuffer, vk::Image image, vk::Format format, vk::ImageLayout oldImageLayout, vk::ImageLayout newImageLayout );

    struct WindowData
    {
      WindowData( GLFWwindow * wnd, std::string const & name, vk::Extent2D const & extent );
      WindowData( const WindowData & ) = delete;
      WindowData( WindowData && other );
      ~WindowData() noexcept;

      GLFWwindow * handle;
      std::string  name;
      vk::Extent2D extent;
    };

    WindowData createWindow( std::string const & windowName, vk::Extent2D const & extent );

    struct BufferData
    {
      BufferData( vk::PhysicalDevice const & physicalDevice,
                  vk::Device const &         device,
                  vk::DeviceSize             size,
                  vk::BufferUsageFlags       usage,
                  vk::MemoryPropertyFlags    propertyFlags = vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent );

      void clear( vk::Device const & device )
      {
        device.freeMemory( deviceMemory );
        device.destroyBuffer( buffer );
      }

      template <typename DataType>
      void upload( vk::Device const & device, DataType const & data ) const
      {
        assert( ( m_propertyFlags & vk::MemoryPropertyFlagBits::eHostCoherent ) && ( m_propertyFlags & vk::MemoryPropertyFlagBits::eHostVisible ) );
        assert( sizeof( DataType ) <= m_size );

        void * dataPtr = device.mapMemory( deviceMemory, 0, sizeof( DataType ) );
        memcpy( dataPtr, &data, sizeof( DataType ) );
        device.unmapMemory( deviceMemory );
      }

      template <typename DataType>
      void upload( vk::Device const & device, std::vector<DataType> const & data, size_t stride = 0 ) const
      {
        assert( m_propertyFlags & vk::MemoryPropertyFlagBits::eHostVisible );

        size_t elementSize = stride ? stride : sizeof( DataType );
        assert( sizeof( DataType ) <= elementSize );

        copyToDevice( device, deviceMemory, data.data(), data.size(), elementSize );
      }

      template <typename DataType>
      void upload( vk::PhysicalDevice const &    physicalDevice,
                   vk::Device const &            device,
                   vk::CommandPool const &       commandPool,
                   vk::Queue                     queue,
                   std::vector<DataType> const & data,
                   size_t                        stride ) const
      {
        assert( m_usage & vk::BufferUsageFlagBits::eTransferDst );
        assert( m_propertyFlags & vk::MemoryPropertyFlagBits::eDeviceLocal );

        size_t elementSize = stride ? stride : sizeof( DataType );
        assert( sizeof( DataType ) <= elementSize );

        size_t dataSize = data.size() * elementSize;
        assert( dataSize <= m_size );

        vk::su::BufferData stagingBuffer( physicalDevice, device, dataSize, vk::BufferUsageFlagBits::eTransferSrc );
        copyToDevice( device, stagingBuffer.deviceMemory, data.data(), data.size(), elementSize );

        vk::su::oneTimeSubmit( device,
                               commandPool,
                               queue,
                               [&]( vk::CommandBuffer const & commandBuffer )
                               { commandBuffer.copyBuffer( stagingBuffer.buffer, buffer, vk::BufferCopy( 0, 0, dataSize ) ); } );

        stagingBuffer.clear( device );
      }

      vk::Buffer       buffer;
      vk::DeviceMemory deviceMemory;
#if !defined( NDEBUG )
    private:
      vk::DeviceSize          m_size;
      vk::BufferUsageFlags    m_usage;
      vk::MemoryPropertyFlags m_propertyFlags;
#endif
    };

    struct ImageData
    {
      ImageData( vk::PhysicalDevice const & physicalDevice,
                 vk::Device const &         device,
                 vk::Format                 format,
                 vk::Extent2D const &       extent,
                 vk::ImageTiling            tiling,
                 vk::ImageUsageFlags        usage,
                 vk::ImageLayout            initialLayout,
                 vk::MemoryPropertyFlags    memoryProperties,
                 vk::ImageAspectFlags       aspectMask );

      void clear( vk::Device const & device )
      {
        device.destroyImageView( imageView );
        device.freeMemory( deviceMemory );
        device.destroyImage( image );
      }

      vk::Format       format;
      vk::Image        image;
      vk::DeviceMemory deviceMemory;
      vk::ImageView    imageView;
    };

    struct DepthBufferData : public ImageData
    {
      DepthBufferData( vk::PhysicalDevice const & physicalDevice, vk::Device const & device, vk::Format format, vk::Extent2D const & extent );
    };

    struct SurfaceData
    {
      SurfaceData( vk::Instance const & instance, std::string const & windowName, vk::Extent2D const & extent );

      vk::Extent2D   extent;
      WindowData     window;
      vk::SurfaceKHR surface;
    };

    struct SwapChainData
    {
      SwapChainData( vk::PhysicalDevice const & physicalDevice,
                     vk::Device const &         device,
                     vk::SurfaceKHR const &     surface,
                     vk::Extent2D const &       extent,
                     vk::ImageUsageFlags        usage,
                     vk::SwapchainKHR const &   oldSwapChain,
                     uint32_t                   graphicsFamilyIndex,
                     uint32_t                   presentFamilyIndex );

      void clear( vk::Device const & device )
      {
        for ( auto & imageView : imageViews )
        {
          device.destroyImageView( imageView );
        }
        imageViews.clear();
        images.clear();
        device.destroySwapchainKHR( swapChain );
      }

      vk::Format                 colorFormat;
      vk::SwapchainKHR           swapChain;
      std::vector<vk::Image>     images;
      std::vector<vk::ImageView> imageViews;
    };

    class CheckerboardImageGenerator
    {
    public:
      CheckerboardImageGenerator( std::array<uint8_t, 3> const & rgb0 = { { 0, 0, 0 } }, std::array<uint8_t, 3> const & rgb1 = { { 255, 255, 255 } } );

      void operator()( void * data, vk::Extent2D & extent ) const;

    private:
      std::array<uint8_t, 3> const & m_rgb0;
      std::array<uint8_t, 3> const & m_rgb1;
    };

    class MonochromeImageGenerator
    {
    public:
      MonochromeImageGenerator( std::array<unsigned char, 3> const & rgb );

      void operator()( void * data, vk::Extent2D const & extent ) const;

    private:
      std::array<unsigned char, 3> const & m_rgb;
    };

    class PixelsImageGenerator
    {
    public:
      PixelsImageGenerator( vk::Extent2D const & extent, size_t channels, unsigned char const * pixels );

      void operator()( void * data, vk::Extent2D const & extent ) const;

    private:
      vk::Extent2D          m_extent;
      size_t                m_channels;
      unsigned char const * m_pixels;
    };

    struct TextureData
    {
      TextureData( vk::PhysicalDevice const & physicalDevice,
                   vk::Device const &         device,
                   vk::Extent2D const &       extent_            = { 256, 256 },
                   vk::ImageUsageFlags        usageFlags         = {},
                   vk::FormatFeatureFlags     formatFeatureFlags = {},
                   bool                       anisotropyEnable   = false,
                   bool                       forceStaging       = false );

      void clear( vk::Device const & device )
      {
        if ( stagingBufferData )
        {
          stagingBufferData->clear( device );
        }
        imageData->clear( device );
        device.destroySampler( sampler );
      }

      template <typename ImageGenerator>
      void setImage( vk::Device const & device, vk::CommandBuffer const & commandBuffer, ImageGenerator const & imageGenerator )
      {
        void * data = needsStaging
                      ? device.mapMemory( stagingBufferData->deviceMemory, 0, device.getBufferMemoryRequirements( stagingBufferData->buffer ).size )
                      : device.mapMemory( imageData->deviceMemory, 0, device.getImageMemoryRequirements( imageData->image ).size );
        imageGenerator( data, extent );
        device.unmapMemory( needsStaging ? stagingBufferData->deviceMemory : imageData->deviceMemory );

        if ( needsStaging )
        {
          // Since we're going to blit to the texture image, set its layout to eTransferDstOptimal
          vk::su::setImageLayout( commandBuffer, imageData->image, imageData->format, vk::ImageLayout::eUndefined, vk::ImageLayout::eTransferDstOptimal );
          vk::BufferImageCopy copyRegion( 0,
                                          extent.width,
                                          extent.height,
                                          vk::ImageSubresourceLayers( vk::ImageAspectFlagBits::eColor, 0, 0, 1 ),
                                          vk::Offset3D( 0, 0, 0 ),
                                          vk::Extent3D( extent, 1 ) );
          commandBuffer.copyBufferToImage( stagingBufferData->buffer, imageData->image, vk::ImageLayout::eTransferDstOptimal, copyRegion );
          // Set the layout for the texture image from eTransferDstOptimal to SHADER_READ_ONLY
          vk::su::setImageLayout(
            commandBuffer, imageData->image, imageData->format, vk::ImageLayout::eTransferDstOptimal, vk::ImageLayout::eShaderReadOnlyOptimal );
        }
        else
        {
          // If we can use the linear tiled image as a texture, just do it
          vk::su::setImageLayout(
            commandBuffer, imageData->image, imageData->format, vk::ImageLayout::ePreinitialized, vk::ImageLayout::eShaderReadOnlyOptimal );
        }
      }

      vk::Format                  format;
      vk::Extent2D                extent;
      bool                        needsStaging;
      std::unique_ptr<BufferData> stagingBufferData;
      std::unique_ptr<ImageData>  imageData;
      vk::Sampler                 sampler;
    };

    struct UUID
    {
    public:
      UUID( uint8_t const data[VK_UUID_SIZE] );

      uint8_t m_data[VK_UUID_SIZE];
    };

    template <typename TargetType, typename SourceType>
    VULKAN_HPP_INLINE TargetType checked_cast( SourceType value )
    {
      static_assert( sizeof( TargetType ) <= sizeof( SourceType ), "No need to cast from smaller to larger type!" );
      static_assert( std::numeric_limits<SourceType>::is_integer, "Only integer types supported!" );
      static_assert( !std::numeric_limits<SourceType>::is_signed, "Only unsigned types supported!" );
      static_assert( std::numeric_limits<TargetType>::is_integer, "Only integer types supported!" );
      static_assert( !std::numeric_limits<TargetType>::is_signed, "Only unsigned types supported!" );
      assert( value <= std::numeric_limits<TargetType>::max() );
      return static_cast<TargetType>( value );
    }

    vk::DeviceMemory               allocateDeviceMemory( vk::Device const &                         device,
                                                         vk::PhysicalDeviceMemoryProperties const & memoryProperties,
                                                         vk::MemoryRequirements const &             memoryRequirements,
                                                         vk::MemoryPropertyFlags                    memoryPropertyFlags );
    bool                           contains( std::vector<vk::ExtensionProperties> const & extensionProperties, std::string const & extensionName );
    vk::CommandPool                createCommandPool( vk::Device const & device, uint32_t queueFamilyIndex );
    vk::DescriptorPool             createDescriptorPool( vk::Device const & device, std::vector<vk::DescriptorPoolSize> const & poolSizes );
    vk::DescriptorSetLayout        createDescriptorSetLayout( vk::Device const &                                                                  device,
                                                              std::vector<std::tuple<vk::DescriptorType, uint32_t, vk::ShaderStageFlags>> const & bindingData,
                                                              vk::DescriptorSetLayoutCreateFlags                                                  flags = {} );
    vk::Device                     createDevice( vk::PhysicalDevice const &         physicalDevice,
                                                 uint32_t                           queueFamilyIndex,
                                                 std::vector<std::string> const &   extensions             = {},
                                                 vk::PhysicalDeviceFeatures const * physicalDeviceFeatures = nullptr,
                                                 void const *                       pNext                  = nullptr );
    std::vector<vk::Framebuffer>   createFramebuffers( vk::Device const &                 device,
                                                       vk::RenderPass &                   renderPass,
                                                       std::vector<vk::ImageView> const & imageViews,
                                                       vk::ImageView const &              depthImageView,
                                                       vk::Extent2D const &               extent );
    vk::Pipeline                   createGraphicsPipeline( vk::Device const &                                                  device,
                                                           vk::PipelineCache const &                                           pipelineCache,
                                                           std::pair<vk::ShaderModule, vk::SpecializationInfo const *> const & vertexShaderData,
                                                           std::pair<vk::ShaderModule, vk::SpecializationInfo const *> const & fragmentShaderData,
                                                           uint32_t                                                            vertexStride,
                                                           std::vector<std::pair<vk::Format, uint32_t>> const &                vertexInputAttributeFormatOffset,
                                                           vk::FrontFace                                                       frontFace,
                                                           bool                                                                depthBuffered,
                                                           vk::PipelineLayout const &                                          pipelineLayout,
                                                           vk::RenderPass const &                                              renderPass );
    vk::Instance                   createInstance( std::string const &              appName,
                                                   std::string const &              engineName,
                                                   std::vector<std::string> const & layers     = {},
                                                   std::vector<std::string> const & extensions = {},
                                                   uint32_t                         apiVersion = VK_API_VERSION_1_0 );
    vk::RenderPass                 createRenderPass( vk::Device const &   device,
                                                     vk::Format           colorFormat,
                                                     vk::Format           depthFormat,
                                                     vk::AttachmentLoadOp loadOp           = vk::AttachmentLoadOp::eClear,
                                                     vk::ImageLayout      colorFinalLayout = vk::ImageLayout::ePresentSrcKHR );
    VKAPI_ATTR VkBool32 VKAPI_CALL debugUtilsMessengerCallback( VkDebugUtilsMessageSeverityFlagBitsEXT       messageSeverity,
                                                                VkDebugUtilsMessageTypeFlagsEXT              messageTypes,
                                                                VkDebugUtilsMessengerCallbackDataEXT const * pCallbackData,
                                                                void * /*pUserData*/ );
    uint32_t                       findGraphicsQueueFamilyIndex( std::vector<vk::QueueFamilyProperties> const & queueFamilyProperties );
    std::pair<uint32_t, uint32_t>  findGraphicsAndPresentQueueFamilyIndex( vk::PhysicalDevice physicalDevice, vk::SurfaceKHR const & surface );
    uint32_t findMemoryType( vk::PhysicalDeviceMemoryProperties const & memoryProperties, uint32_t typeBits, vk::MemoryPropertyFlags requirementsMask );
    std::vector<char const *> gatherExtensions( std::vector<std::string> const & extensions
#if !defined( NDEBUG )
                                                ,
                                                std::vector<vk::ExtensionProperties> const & extensionProperties
#endif
    );
    std::vector<char const *> gatherLayers( std::vector<std::string> const & layers
#if !defined( NDEBUG )
                                            ,
                                            std::vector<vk::LayerProperties> const & layerProperties
#endif
    );
    std::vector<std::string>             getDeviceExtensions();
    std::vector<std::string>             getInstanceExtensions();
    vk::DebugUtilsMessengerCreateInfoEXT makeDebugUtilsMessengerCreateInfoEXT();
#if defined( NDEBUG )
    vk::StructureChain<vk::InstanceCreateInfo>
#else
    vk::StructureChain<vk::InstanceCreateInfo, vk::DebugUtilsMessengerCreateInfoEXT>
#endif
                         makeInstanceCreateInfoChain( vk::ApplicationInfo const &       applicationInfo,
                                                      std::vector<char const *> const & layers,
                                                      std::vector<char const *> const & extensions );
    vk::Format           pickDepthFormat( vk::PhysicalDevice const & physicalDevice );
    vk::PresentModeKHR   pickPresentMode( std::vector<vk::PresentModeKHR> const & presentModes );
    vk::SurfaceFormatKHR pickSurfaceFormat( std::vector<vk::SurfaceFormatKHR> const & formats );
    void                 submitAndWait( vk::Device const & device, vk::Queue const & queue, vk::CommandBuffer const & commandBuffer );
    void                 updateDescriptorSets( vk::Device const &                                                                                              device,
                                               vk::DescriptorSet const &                                                                                       descriptorSet,
                                               std::vector<std::tuple<vk::DescriptorType, vk::Buffer const &, vk::DeviceSize, vk::BufferView const &>> const & bufferData,
                                               vk::su::TextureData const &                                                                                     textureData,
                                               uint32_t bindingOffset = 0 );
    void                 updateDescriptorSets( vk::Device const &                                                                                              device,
                                               vk::DescriptorSet const &                                                                                       descriptorSet,
                                               std::vector<std::tuple<vk::DescriptorType, vk::Buffer const &, vk::DeviceSize, vk::BufferView const &>> const & bufferData,
                                               std::vector<vk::su::TextureData> const &                                                                        textureData,
                                               uint32_t bindingOffset = 0 );

  }  // namespace su
}  // namespace vk

std::ostream & operator<<( std::ostream & os, vk::su::UUID const & uuid );