/****************************************************************************
 Copyright (c) 2019-2023 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,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 THE SOFTWARE.
****************************************************************************/

#pragma once

#import "MTLConfig.h"
#import "gfx-base/GFXDevice.h"

namespace cc {
namespace gfx {

struct CCMTLGPUDeviceObject;

class CCMTLGPUStagingBufferPool;
class CCMTLSemaphore;
class CCMTLSwapchain;

class CCMTLDevice final : public Device {
public:
    static CCMTLDevice *getInstance();

    CCMTLDevice();
    ~CCMTLDevice();

    CCMTLDevice(const CCMTLDevice &) = delete;
    CCMTLDevice(CCMTLDevice &&) = delete;
    CCMTLDevice &operator=(const CCMTLDevice &) = delete;
    CCMTLDevice &operator=(CCMTLDevice &&) = delete;

    using Device::copyBuffersToTexture;
    using Device::createBuffer;
    using Device::createCommandBuffer;
    using Device::createDescriptorSet;
    using Device::createDescriptorSetLayout;
    using Device::createFramebuffer;
    using Device::createInputAssembler;
    using Device::createPipelineLayout;
    using Device::createPipelineState;
    using Device::createQueryPool;
    using Device::createQueue;
    using Device::createRenderPass;
    using Device::createShader;
    using Device::createTexture;

    void frameSync() override;

    void acquire(Swapchain *const *swapchains, uint32_t count) override;
    void present() override;

    void onPresentCompleted(uint32_t index);

    inline void *getMTLCommandQueue() const { return _mtlCommandQueue; }
    inline void *getMTLDevice() const { return _mtlDevice; }
    inline uint32_t getMaximumSamplerUnits() const { return _maxSamplerUnits; }
    inline uint32_t getMaximumColorRenderTargets() const { return _caps.maxColorRenderTargets; }
    inline uint32_t getMaximumBufferBindingIndex() const { return _maxBufferBindingIndex; }
    inline bool isIndirectCommandBufferSupported() const { return _icbSuppored; }
    inline bool isIndirectDrawSupported() const { return _indirectDrawSupported; }
    inline CCMTLGPUStagingBufferPool *gpuStagingBufferPool() const { return _gpuStagingBufferPools[_currentFrameIndex]; }
    inline bool isSamplerDescriptorCompareFunctionSupported() const { return _isSamplerDescriptorCompareFunctionSupported; }
    inline uint32_t currentFrameIndex() const { return _currentFrameIndex; }

    inline void registerSwapchain(CCMTLSwapchain *swapchain) { _swapchains.push_back(swapchain); }
    inline void unRegisterSwapchain(CCMTLSwapchain *swapchain) {
        auto iter = std::find(_swapchains.begin(), _swapchains.end(), swapchain);
        if (iter != _swapchains.end()) {
            _swapchains.erase(iter);
        }
    }
    
    inline CCMTLGPUDeviceObject* gpuObject() const { return _gpuDeviceObj; }

protected:
    static CCMTLDevice *_instance;

    friend class DeviceManager;

    bool doInit(const DeviceInfo &info) override;
    void doDestroy() override;
    CommandBuffer *createCommandBuffer(const CommandBufferInfo &info, bool hasAgent) override;
    Queue *createQueue() override;
    QueryPool *createQueryPool() override;
    Buffer *createBuffer() override;
    Texture *createTexture() override;
    Shader *createShader() override;
    InputAssembler *createInputAssembler() override;
    RenderPass *createRenderPass() override;
    Framebuffer *createFramebuffer() override;
    DescriptorSet *createDescriptorSet() override;
    DescriptorSetLayout *createDescriptorSetLayout() override;
    PipelineLayout *createPipelineLayout() override;
    PipelineState *createPipelineState() override;
    Sampler *createSampler(const SamplerInfo &info) override;
    Swapchain *createSwapchain() override;
    void copyBuffersToTexture(const uint8_t *const *buffers, Texture *dst, const BufferTextureCopy *regions, uint32_t count) override;
    void copyTextureToBuffers(Texture *src, uint8_t *const *buffers, const BufferTextureCopy *region, uint32_t count) override;
    void getQueryPoolResults(QueryPool *queryPool) override;
    SampleCount getMaxSampleCount(Format format, TextureUsage usage, TextureFlags flags) const override;

    void onMemoryWarning();
    void initFormatFeatures(uint32_t family);

    void *_mtlCommandQueue = nullptr;
    void *_mtlDevice = nullptr;
    void *_activeDrawable = nullptr;
    unsigned long _mtlFeatureSet = 0;
    uint32_t _maxSamplerUnits = 0;
    uint32_t _maxBufferBindingIndex = 0;
    bool _icbSuppored = false;
    bool _indirectDrawSupported = false;
    bool _isSamplerDescriptorCompareFunctionSupported = false;
    CCMTLGPUStagingBufferPool *_gpuStagingBufferPools[MAX_FRAMES_IN_FLIGHT] = {nullptr};
    uint32_t _currentBufferPoolId = 0;
    uint32_t _currentFrameIndex = 0;
    CC_UNUSED uint32_t _memoryAlarmListenerId = 0;

    ccstd::vector<CCMTLSwapchain *> _swapchains;

    CCMTLGPUDeviceObject *_gpuDeviceObj = nullptr;
};

} // namespace gfx
} // namespace cc