/****************************************************************************
 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,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 THE SOFTWARE.
****************************************************************************/
#pragma once

#include <cmath>
#include <functional>
#include <numeric>
#include <sstream>
#include "base/RefVector.h"
#include "base/std/container/string.h"
#include "base/std/container/unordered_map.h"
#include "base/std/optional.h"
#include "core/Types.h"
#include "core/assets/EffectAsset.h"
#include "renderer/gfx-base/GFXDef-common.h"
#include "renderer/pipeline/Define.h"
#include "renderer/pipeline/RenderPipeline.h"

namespace cc {
class EffectAsset;

namespace render {
class PipelineRuntime;
} // namespace render

struct IDefineRecord : public IDefineInfo {
    std::function<int32_t(const MacroValue &)> map{nullptr};
    int32_t offset{0};
};
struct IMacroInfo {
    ccstd::string name;
    ccstd::string value;
    bool isDefault{false};
};

struct ITemplateInfo {
    ccstd::vector<gfx::Attribute> gfxAttributes;
    gfx::ShaderInfo shaderInfo;
    ccstd::vector<int32_t> blockSizes;
    RefVector<gfx::DescriptorSetLayout *> setLayouts;
    IntrusivePtr<gfx::PipelineLayout> pipelineLayout;
    ccstd::unordered_map<ccstd::string, uint32_t> handleMap;
    ccstd::vector<gfx::DescriptorSetLayoutBinding> bindings;
    int32_t samplerStartBinding{-1};
};

struct IProgramInfo : public IShaderInfo {
    ccstd::string effectName;
    ccstd::vector<IDefineRecord> defines;
    ccstd::string constantMacros;
    bool uber{false}; // macro number exceeds default limits, will fallback to string hash

    void copyFrom(const IShaderInfo &o);
};

const char *getDeviceShaderVersion(const gfx::Device *device);

/**
 * @en The global maintainer of all shader resources.
 * @zh 维护 shader 资源实例的全局管理器。
 */
class ProgramLib final {
public:
    static ProgramLib *getInstance();

    ProgramLib();
    ~ProgramLib();

    void registerEffect(EffectAsset *effect);

    /**
     * @en Register the shader template with the given info
     * @zh 注册 shader 模板。
     */
    IProgramInfo *define(IShaderInfo &shader);

    /**
     * @en Gets the shader template with its name
     * @zh 通过名字获取 Shader 模板
     * @param name Target shader name
     */

    const IProgramInfo *getTemplate(const ccstd::string &name) const;

    /**
     * @en Gets the shader template info with its name
     * @zh 通过名字获取 Shader 模版信息
     * @param name Target shader name
     */

    ITemplateInfo *getTemplateInfo(const ccstd::string &name);

    /**
     * @en Gets the pipeline layout of the shader template given its name
     * @zh 通过名字获取 Shader 模板相关联的管线布局
     * @param name Target shader name
     */
    gfx::DescriptorSetLayout *getDescriptorSetLayout(gfx::Device *device, const ccstd::string &name, bool isLocal = false);

    /**
     * @en
     * Does this library has the specified program
     * @zh
     * 当前是否有已注册的指定名字的 shader
     * @param name Target shader name
     */
    inline bool hasProgram(const ccstd::string &name) const {
        return _templates.count(name) > 0;
    }

    /**
     * @en Gets the shader key with the name and a macro combination
     * @zh 根据 shader 名和预处理宏列表获取 shader key。
     * @param name Target shader name
     * @param defines The combination of preprocess macros
     */
    ccstd::string getKey(const ccstd::string &name, const MacroRecord &defines);

    /**
     * @en Destroy all shader instance match the preprocess macros
     * @zh 销毁所有完全满足指定预处理宏特征的 shader 实例。
     * @param defines The preprocess macros as filter
     */

    void destroyShaderByDefines(const MacroRecord &defines);

    /**
     * @en Gets the shader resource instance with given information
     * @zh 获取指定 shader 的渲染资源实例
     * @param name Shader name
     * @param defines Preprocess macros
     * @param pipeline The [[RenderPipeline]] which owns the render command
     * @param key The shader cache key, if already known
     */
    gfx::Shader *getGFXShader(gfx::Device *device, const ccstd::string &name, MacroRecord &defines,
                              render::PipelineRuntime *pipeline, ccstd::string *key = nullptr);

private:
    CC_DISALLOW_COPY_MOVE_ASSIGN(ProgramLib);

    static ProgramLib *instance;
    ccstd::unordered_map<ccstd::string, IProgramInfo> _templates; // per shader
    ccstd::unordered_map<ccstd::string, IntrusivePtr<gfx::Shader>> _cache;
    ccstd::unordered_map<uint64_t, ITemplateInfo> _templateInfos;
};

} // namespace cc