// vulkan_engine.h : Include file for standard system include files,
// or project specific include files.

#pragma once

#include <core/vk_types.h>

#include "core/vk_descriptors.h"
#include <unordered_map>
#include <filesystem>

class VulkanEngine;

struct Bounds
{
    glm::vec3 origin;
    float sphereRadius;
    glm::vec3 extents;
};

struct GLTFMaterial
{
    MaterialInstance data;
};

struct GeoSurface
{
    uint32_t startIndex;
    uint32_t count;
    Bounds bounds;
    std::shared_ptr<GLTFMaterial> material;
};

struct MeshAsset
{
    std::string name;


    std::vector<GeoSurface> surfaces;
    GPUMeshBuffers meshBuffers;
};

struct LoadedGLTF : public IRenderable
{
    // storage for all the data on a given gltf file
    std::unordered_map<std::string, std::shared_ptr<MeshAsset> > meshes;
    std::unordered_map<std::string, std::shared_ptr<Node> > nodes;
    std::unordered_map<std::string, AllocatedImage> images;
    std::unordered_map<std::string, std::shared_ptr<GLTFMaterial> > materials;

    // nodes that dont have a parent, for iterating through the file in tree order
    std::vector<std::shared_ptr<Node> > topNodes;

    std::vector<VkSampler> samplers;

    DescriptorAllocatorGrowable descriptorPool;

    AllocatedBuffer materialDataBuffer;

    VulkanEngine *creator;

    ~LoadedGLTF() { clearAll(); };

    void clearMeshes(){ clearAll(); };

    virtual void Draw(const glm::mat4 &topMatrix, DrawContext &ctx);

private:
    void clearAll();
};

std::optional<std::shared_ptr<LoadedGLTF> > loadGltf(VulkanEngine *engine, std::string_view filePath);