/*
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vector>

#define GLM_FORCE_RADIANS
#define GLM_FORCE_DEPTH_ZERO_TO_ONE
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>



#ifdef VK_USE_PLATFORM_ANDROID_KHR
	#define TINYGLTF_ANDROID_LOAD_FROM_ASSETS
#endif

#define TINYGLTF_IMPLEMENTATION
#define STB_IMAGE_IMPLEMENTATION
#define TINYGLTF_NO_STB_IMAGE_WRITE
#include "tiny_gltf.h"
*/
#include "vulkanexamplebase.h"
#include "glTFModel.h"

#define ENABLE_VALIDATION false



class VulkanExample : public VulkanExampleBase
{
public:
	bool wireframe = false;
	bool normalMapping = true;
	bool ToneMapping = true;
	bool pbrEnabled = true;

	VulkanglTFModel glTFModel;

	struct ShaderData {
		vks::Buffer buffer;
		struct Values {
			glm::mat4 projection;
			glm::mat4 model;
			glm::vec4 lightPos = glm::vec4(5.0f, 5.0f, 5.0f, 1.0f);
			glm::vec4 viewPos;
			glm::vec4 bFlagSet = glm::vec4(0.0f, 0.0f, 0.0f, 0.0f);
		} values;
		vks::Buffer skinSSBO;
	} shaderData;

	struct StagingBuffer {
		VkBuffer buffer;
		VkDeviceMemory memory;
	} vertexStaging, indexStaging;

	struct Pipelines {
		VkPipeline solid;
		VkPipeline wireframe = VK_NULL_HANDLE;
		VkPipeline toneMapping = VK_NULL_HANDLE;
	} pipelines;

	struct  PipelineLayouts
	{
		VkPipelineLayout pbrLayout;
		VkPipelineLayout tonemappingLayout;
	} pipelineLayouts;

	VkPipelineLayout pipelineLayout;
	
	VkDescriptorSet descriptorSet;
	VkDescriptorSet skinDescriptorSet;
	VkDescriptorSet tonemappingDescriptorSet = VK_NULL_HANDLE;

	struct FrameBufferAttachment
	{
		VkImage image;
		VkDeviceMemory deviceMemory;
		VkImageView imageView;
		VkFormat format;
		

		void destroy(VkDevice device)
		{
			vkDestroyImage(device, image, nullptr);
			vkDestroyImageView(device, imageView,nullptr);
			vkFreeMemory(device, deviceMemory, nullptr);

		}
	};

	struct FrameBuffer
	{
		int32_t width, height;
		VkFramebuffer frameBuffer;
		VkRenderPass renderPass;
		void setSize(int32_t w, int32_t h)
		{
			this->width = w;
			this->height = h;
		}
		void destroy(VkDevice device)
		{
			vkDestroyFramebuffer(device, frameBuffer, nullptr);
			vkDestroyRenderPass(device, renderPass, nullptr);
		}
	};

	struct PBRFrameBuffer {
		FrameBufferAttachment color, depth;
		FrameBuffer fbo;
		bool bCreate = false;
	} pbrFrameBuffer;

	VkSampler colorSampler;

	struct DescriptorSetLayouts {
		VkDescriptorSetLayout matrices;
		VkDescriptorSetLayout textures;
		VkDescriptorSetLayout materialUniform;
		VkDescriptorSetLayout ssbo;
		VkDescriptorSetLayout jointMatrices;
	} descriptorSetLayouts;

	struct IBLTextures
	{
		vks::TextureCubeMap skyboxCube;
		vks::TextureCubeMap irradianceCube;
		vks::TextureCubeMap prefilteredCube;
		vks::Texture2D lutBrdf;
	} ibltextures;

	struct OffScreen
	{
		VkImage image;
		VkImageView view;
		VkDeviceMemory memory;
		VkFramebuffer framebuffer;
	} offscreen;

	struct IrradiancePushBlock
	{
		glm::mat4 mvp;
		// Sampling deltas
		float deltaPhi = (2.0f * float(M_PI)) / 180.0f;
		float deltaTheta = (0.5f * float(M_PI)) / 64.0f;
	} irradiancePushBlock;

	struct PrefilterPushBlock {
		glm::mat4 mvp;
		float roughness;
		uint32_t numSamples = 32u;
	} prefilterPushBlock;

	VulkanglTFModel skyboxModel;

	VulkanExample();
	~VulkanExample()
	{
		// Clean up used Vulkan resources
		// Note : Inherited destructor cleans up resources stored in base class
		vkDestroyPipeline(device, pipelines.solid, nullptr);
		vkDestroyPipeline(device, pipelines.toneMapping, nullptr);
		if (pipelines.wireframe != VK_NULL_HANDLE) {
			vkDestroyPipeline(device, pipelines.wireframe, nullptr);
		}

		vkDestroyPipelineLayout(device, pipelineLayouts.pbrLayout, nullptr);
		vkDestroyPipelineLayout(device, pipelineLayouts.tonemappingLayout, nullptr);
		vkDestroyDescriptorSetLayout(device, descriptorSetLayouts.matrices, nullptr);
		vkDestroyDescriptorSetLayout(device, descriptorSetLayouts.textures, nullptr);
		vkDestroyDescriptorSetLayout(device, descriptorSetLayouts.materialUniform, nullptr);
		vkDestroyDescriptorSetLayout(device, descriptorSetLayouts.ssbo, nullptr);
		ibltextures.irradianceCube.destroy();
		ibltextures.skyboxCube.destroy();
		ibltextures.prefilteredCube.destroy();
		ibltextures.lutBrdf.destroy();
		pbrFrameBuffer.color.destroy(device);
		pbrFrameBuffer.depth.destroy(device);
		pbrFrameBuffer.fbo.destroy(device);
		vkDestroySampler(device, colorSampler, nullptr);

		shaderData.buffer.destroy();
		shaderData.skinSSBO.destroy();
	}
	void         loadglTFFile(std::string filename, VulkanglTFModel& model, bool bSkyboxFlag);
	virtual void getEnabledFeatures();
	void createAttachment(VkFormat format, VkImageUsageFlagBits usage, FrameBufferAttachment* attachment, uint32_t width, uint32_t height);
	virtual void setupFrameBuffer();
	void         buildCommandBuffers();
	void         loadAssets();
	void         setupDescriptors();
	void         preparePipelines();
	void CreateToneMappingPipeline();
	void GenerateIrradianceCubemap();
	void GeneratePrefilteredCubemap();
	void GenerateBRDFLUT();
	void         prepareUniformBuffers();
	void         updateUniformBuffers();
	void         prepare();
	virtual void render();
	virtual void viewChanged();
	virtual void OnUpdateUIOverlay(vks::UIOverlay* overlay);
};