/****************************************************************************
 Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.

 http://www.cocos.com

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights to
 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 of the Software, and to permit persons to whom the Software is furnished to do so,
 subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 THE SOFTWARE.
****************************************************************************/

#pragma once

#include "ResourceAllocator.h"

#include "Handle.h"
#include "renderer/gfx-base/GFXBuffer.h"
#include "renderer/gfx-base/GFXDevice.h"
#include "renderer/gfx-base/GFXFramebuffer.h"
#include "renderer/gfx-base/GFXRenderPass.h"
#include "renderer/gfx-base/GFXTexture.h"

namespace cc {
namespace framegraph {

template <typename DeviceResourceType, typename DescriptorType>
struct DeviceResourceCreator final {
    inline DeviceResourceType *operator()(const DescriptorType & /*desc*/) const {
        return nullptr;
    }
};

template <typename DescriptorType>
struct ResourceTypeLookupTable final {};

template <typename DeviceResourceType, typename DescriptorType,
          typename DeviceResourceCreatorType = DeviceResourceCreator<DeviceResourceType, DescriptorType>>
class Resource final {
public:
    using Allocator = ResourceAllocator<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>;
    using DeviceResource = DeviceResourceType;
    using Descriptor = DescriptorType;

    Resource() = default;
    explicit Resource(const Descriptor &desc);
    ~Resource() = default;
    Resource(const Resource &) = default;
    Resource(Resource &&) noexcept = default;
    Resource &operator=(const Resource &) = default;
    Resource &operator=(Resource &&) noexcept = default;

    void createTransient() noexcept;
    void createPersistent() noexcept;

    void destroyTransient() noexcept;
    void destroyPersistent() noexcept;
    inline DeviceResourceType *get() const noexcept;
    inline const Descriptor &getDesc() const noexcept;

private:
    explicit Resource(DeviceResourceType *external);

    Descriptor _desc;
    DeviceResourceType *_deviceObject{nullptr};

    friend class FrameGraph;
};

//////////////////////////////////////////////////////////////////////////

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::Resource(const Descriptor &desc)
: _desc(desc) {
}

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::Resource(DeviceResourceType *external)
: _desc(external->getInfo()), _deviceObject(external) {
}

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
void Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::createTransient() noexcept {
    _deviceObject = Allocator::getInstance().alloc(_desc);
}

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
void Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::createPersistent() noexcept {
    if (!_deviceObject) {
        DeviceResourceCreatorType creator;
        _deviceObject = creator(_desc);
        _deviceObject->addRef();
    }
}

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
void Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::destroyTransient() noexcept {
    Allocator::getInstance().free(_deviceObject);
    _deviceObject = nullptr;
}

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
void Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::destroyPersistent() noexcept {
    if (_deviceObject) {
        _deviceObject->release();
        _deviceObject = nullptr;
    }
}

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
DeviceResourceType *Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::get() const noexcept {
    return _deviceObject;
}

template <typename DeviceResourceType, typename DescriptorType, typename DeviceResourceCreatorType>
const DescriptorType &Resource<DeviceResourceType, DescriptorType, DeviceResourceCreatorType>::getDesc() const noexcept {
    return _desc;
}

//////////////////////////////////////////////////////////////////////////

#define DEFINE_GFX_RESOURCE(Type)                                         \
    template <>                                                           \
    struct DeviceResourceCreator<gfx::Type, gfx::Type##Info> final {      \
        inline gfx::Type *operator()(const gfx::Type##Info &desc) const { \
            return gfx::Device::getInstance()->create##Type(desc);        \
        }                                                                 \
    };                                                                    \
    using Type = Resource<gfx::Type, gfx::Type##Info>;                    \
    using Type##Handle = TypedHandle<Type>;                               \
    template <>                                                           \
    struct ResourceTypeLookupTable<gfx::Type##Info> final {               \
        using Resource = Type;                                            \
    };

// Descriptors must have std::hash specialization and == operators
DEFINE_GFX_RESOURCE(Buffer)
DEFINE_GFX_RESOURCE(Framebuffer)
DEFINE_GFX_RESOURCE(RenderPass)
DEFINE_GFX_RESOURCE(Texture)

} // namespace framegraph
} // namespace cc