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

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 of this software and associated documentation files (the "Software"), to deal
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****************************************************************************/

#pragma once

#include "core/assets/Asset.h"
#include "core/assets/SimpleTexture.h"

namespace cc {

class ImageAsset;
class Texture2D;
struct ITexture2DCreateInfo;

using ITextureCubeCreateInfo = ITexture2DCreateInfo;

/**
 * @en The texture cube mipmap interface
 * @zh 立方体贴图的 Mipmap 接口。
 */
struct ITextureCubeMipmap {
    IntrusivePtr<ImageAsset> front;
    IntrusivePtr<ImageAsset> back;
    IntrusivePtr<ImageAsset> left;
    IntrusivePtr<ImageAsset> right;
    IntrusivePtr<ImageAsset> top;
    IntrusivePtr<ImageAsset> bottom;
};

struct ITextureCubeSerializeMipmapData {
    ccstd::string front;
    ccstd::string back;
    ccstd::string left;
    ccstd::string right;
    ccstd::string top;
    ccstd::string bottom;
};

/**
 * @en The MipmapAtlas region interface
 * @zh MipmapAtlas的region接口。
 */
struct MipmapAtlasLayoutInfo {
    uint32_t left{0};
    uint32_t top{0};
    uint32_t width{0};
    uint32_t height{0};
    uint32_t level{0};
};
/**
 * @en The texture cube MipmapAtlas interface
 * @zh 立方体贴图的 MipmapAtlas 接口。
 */
struct TextureCubeMipmapAtlasInfo {
    ITextureCubeMipmap atlas;
    ccstd::vector<MipmapAtlasLayoutInfo> layout;
};

/**
 * @en The way to fill mipmaps.
 * @zh 填充mipmaps的方式。
 */
enum class MipmapMode {
    /**
     * @zh
     * 不使用mipmaps
     * @en
     * Not using mipmaps
     * @readonly
     */
    NONE = 0,
    /**
     * @zh
     * 使用自动生成的mipmaps
     * @en
     * Using the automatically generated mipmaps
     * @readonly
     */
    AUTO = 1,
    /**
     * @zh
     * 使用卷积图填充mipmaps
     * @en
     * Filling mipmaps with convolutional maps.
     * @readonly
     */
    BAKED_CONVOLUTION_MAP = 2
};
struct TextureCubeSerializeData {
    ccstd::string base;
    bool rgbe{false};
    MipmapMode mipmapMode{MipmapMode::NONE};
    ccstd::vector<ITextureCubeSerializeMipmapData> mipmaps;
    TextureCubeMipmapAtlasInfo mipmapAtlas;
};

/**
 * @en The texture cube asset.
 * Each mipmap level of a texture cube have 6 [[ImageAsset]], represents 6 faces of the cube.
 * @zh 立方体贴图资源。
 * 立方体贴图资源的每个 Mipmap 层级都为 6 张 [[ImageAsset]]，分别代表了立方体贴图的 6 个面。
 */
class TextureCube final : public SimpleTexture {
public:
    using Super = SimpleTexture;

    TextureCube();
    ~TextureCube() override;

    /**
     * @en The index for all faces of the cube
     * @zh 立方体每个面的约定索引。
     */
    enum class FaceIndex {
        RIGHT = 0,
        LEFT = 1,
        TOP = 2,
        BOTTOM = 3,
        FRONT = 4,
        BACK = 5,
    };

    /**
     * @en Create a texture cube with an array of [[Texture2D]] which represents 6 faces of the texture cube.
     * @zh 通过二维贴图数组指定每个 Mipmap 的每个面创建立方体贴图。
     * @param textures Texture array, the texture count must be multiple of 6. Every 6 textures are 6 faces of a mipmap level.
     * The order should obey [[FaceIndex]] order.
     * @param out Output texture cube, if not given, will create a new texture cube.
     * @returns The created texture cube.
     * @example
     * ```ts
     * const textures = new Array<Texture2D>(6);
     * textures[TextureCube.FaceIndex.front] = frontImage;
     * textures[TextureCube.FaceIndex.back] = backImage;
     * textures[TextureCube.FaceIndex.left] = leftImage;
     * textures[TextureCube.FaceIndex.right] = rightImage;
     * textures[TextureCube.FaceIndex.top] = topImage;
     * textures[TextureCube.FaceIndex.bottom] = bottomImage;
     * const textureCube = TextureCube.fromTexture2DArray(textures);
     * ```
     */
    static TextureCube *fromTexture2DArray(const ccstd::vector<Texture2D *> &textures);

    /**
     * @en All levels of mipmap images, be noted, automatically generated mipmaps are not included.
     * When setup mipmap, the size of the texture and pixel format could be modified.
     * @zh 所有层级 Mipmap，注意，这里不包含自动生成的 Mipmap。
     * 当设置 Mipmap 时，贴图的尺寸以及像素格式可能会改变。
     */
    const ccstd::vector<ITextureCubeMipmap> &getMipmaps() const {
        return _mipmaps;
    }

    inline const TextureCubeMipmapAtlasInfo &getMipmapAtlas() const {
        return _mipmapAtlas;
    }

    void setMipmaps(const ccstd::vector<ITextureCubeMipmap> &value);

    void setMipmapsForJS(const ccstd::vector<ITextureCubeMipmap> &value);

    void setMipmapAtlasForJS(const TextureCubeMipmapAtlasInfo &value);

    /**
     * @en Fill mipmaps with convolutional maps.
     * @zh 使用卷积图填充mipmaps。
     * @param value All mipmaps of each face of the cube map are stored in the form of atlas.
     * and the value contains the atlas of the 6 faces and the layout information of each mipmap layer.
     */
    void setMipmapAtlas(const TextureCubeMipmapAtlasInfo &value);

    /**
     * @en Level 0 mipmap image.
     * Be noted, `this.image = img` equals `this.mipmaps = [img]`,
     * sets image will clear all previous mipmaps.
     * @zh 0 级 Mipmap。
     * 注意，`this.image = img` 等价于 `this.mipmaps = [img]`，
     * 也就是说，通过 `this.image` 设置 0 级 Mipmap 时将隐式地清除之前的所有 Mipmap。
     */
    const ITextureCubeMipmap *getImage() const {
        return _mipmaps.empty() ? nullptr : &_mipmaps[0];
    }

    void setImage(const ITextureCubeMipmap *value);

    /**
     * @en Reset the current texture with given size, pixel format and mipmap images.
     * After reset, the gfx resource will become invalid, you must use [[uploadData]] explicitly to upload the new mipmaps to GPU resources.
     * @zh 将当前贴图重置为指定尺寸、像素格式以及指定 mipmap 层级。重置后，贴图的像素数据将变为未定义。
     * mipmap 图像的数据不会自动更新到贴图中，你必须显式调用 [[uploadData]] 来上传贴图数据。
     * @param info The create information
     */
    void reset(const ITextureCubeCreateInfo &info);

    /**
     * @en Release used GPU resources.
     * @zh 释放占用的 GPU 资源。
     * @deprecated please use [[destroy]] instead
     */
    void releaseTexture();

    // Override functions
    void updateMipmaps(uint32_t firstLevel, uint32_t count) override;

    /**
     * @en Whether mipmaps are baked convolutional maps.
     * @zh mipmaps是否为烘焙出来的卷积图。
     */
    bool isUsingOfflineMipmaps() override;

    void initialize();
    void onLoaded() override;
    /**
     * 销毁此贴图，清空所有 Mipmap 并释放占用的 GPU 资源。
     */
    bool destroy() override;

    ccstd::any serialize(const ccstd::any &ctxForExporting) override;
    void deserialize(const ccstd::any &serializedData, const ccstd::any &handle) override;

    gfx::TextureInfo getGfxTextureCreateInfo(gfx::TextureUsageBit usage, gfx::Format format, uint32_t levelCount, gfx::TextureFlagBit flags) override;
    gfx::TextureViewInfo getGfxTextureViewCreateInfo(gfx::Texture *texture, gfx::Format format, uint32_t baseLevel, uint32_t levelCount) override;

    void initDefault(const ccstd::optional<ccstd::string> &uuid) override;

    bool validate() const override;
    //

    /*@serializable*/
    MipmapMode _mipmapMode{MipmapMode::NONE};

    /*@serializable*/
    bool isRGBE{false};

private:
    void setMipmapParams(const ccstd::vector<ITextureCubeMipmap> &value);

    /*@serializable*/
    ccstd::vector<ITextureCubeMipmap> _mipmaps;

    ccstd::vector<ITextureCubeMipmap> _generatedMipmaps;

    /*@serializable*/
    TextureCubeMipmapAtlasInfo _mipmapAtlas;

    CC_DISALLOW_COPY_MOVE_ASSIGN(TextureCube);
};

} // namespace cc