/*

Open Asset Import Library (assimp)

----------------------------------------------------------------------

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All rights reserved.

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* Redistributions in binary form must reproduce the above

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*/

/** @file  COBScene.h

*  @brief Utilities for the COB importer.

*/

#pragma once

#ifndef INCLUDED_AI_COB_SCENE_H

#define INCLUDED_AI_COB_SCENE_H

#include <assimp/BaseImporter.h>

#include <assimp/material.h>

#include <deque>

#include <map>

namespace Assimp::COB {

// ------------------

/** Represents a single vertex index in a face */

struct VertexIndex {

    // intentionally uninitialized

    unsigned int pos_idx,uv_idx;

};

// ------------------

/** COB Face data structure */

struct Face {

    // intentionally uninitialized

    unsigned int material;

    unsigned int flags;

    std::vector<VertexIndex> indices;

};

// ------------------

/** COB chunk header information */

constexpr unsigned int NO_SIZE = UINT_MAX;

struct ChunkInfo {

    ChunkInfo() = default;

    virtual ~ChunkInfo() = default;

    // Id of this chunk, unique within file

    unsigned int id{ 0 };

    // and the corresponding parent

    unsigned int parent_id{ 0 };

    // version. v1.23 becomes 123

    unsigned int version{ 0 };

    // chunk size in bytes, only relevant for binary files

    // NO_SIZE is also valid.

    unsigned int size{NO_SIZE};

};

// ------------------

/** A node in the scenegraph */

struct Node : ChunkInfo {

    enum Type {

        TYPE_INVALID = -1,

        TYPE_MESH = 0,

        TYPE_GROUP,

        TYPE_LIGHT,

        TYPE_CAMERA,

        TYPE_BONE,

        TYPE_COUNT

    };

    ~Node() override = default;

    explicit Node(Type type) : type(type), unit_scale(1.f){}

    Type type;

    // used during resolving

    using ChildList = std::deque<const Node*> ;

    mutable ChildList temp_children;

    // unique name

    std::string name;

    // local mesh transformation

    aiMatrix4x4 transform;

    // scaling for this node to get to the metric system

    float unit_scale;

};

// ------------------

/** COB Mesh data structure */

struct Mesh final : Node {

    using ChunkInfo::operator=;

    enum DrawFlags {

        SOLID = 0x1,

        TRANS = 0x2,

        WIRED = 0x4,

        BBOX  = 0x8,

        HIDE  = 0x10

    };

    Mesh()

        : Node(TYPE_MESH)

        , draw_flags(SOLID)

    {}

    // vertex elements

    std::vector<aiVector2D> texture_coords;

    std::vector<aiVector3D> vertex_positions;

    // face data

    std::vector<Face> faces;

    // misc. drawing flags

    unsigned int draw_flags;

    // used during resolving

    typedef std::deque<Face*> FaceRefList;

    typedef std::map< unsigned int,FaceRefList > TempMap;

    TempMap temp_map;

};

// ------------------

/** COB Group data structure */

struct Group final : Node {

    using ChunkInfo::operator=;

    Group() : Node(TYPE_GROUP) {

        // empty

    }

};

// ------------------

/** COB Bone data structure */

struct Bone final : Node {

    using ChunkInfo::operator=;

    Bone() : Node(TYPE_BONE) {

        // empty

    }

};

// ------------------

/** COB Light data structure */

struct Light final : Node {

    enum LightType {

        SPOT,

        LOCAL,

        INFINITE

    };

    using ChunkInfo::operator=;

    Light() : Node(TYPE_LIGHT), ltype() {

        // empty

    }

    aiColor3D color;

    float angle{ 0.0f };

    float inner_angle{ 0.0f };

    LightType ltype{SPOT};

};

// ------------------

/** COB Camera data structure */

struct Camera final : Node {

    using ChunkInfo::operator=;

    Camera() : Node(TYPE_CAMERA) {

        // empty

    }

};

// ------------------

/** COB Texture data structure */

struct Texture {

    std::string path;

    aiUVTransform transform;

};

// ------------------

/** COB Material data structure */

struct Material : ChunkInfo {

    using ChunkInfo::operator=;

    enum Shader {

        FLAT,

        PHONG,

        METAL

    };

    enum AutoFacet {

        FACETED,

        AUTOFACETED,

        SMOOTH

    };

    Material() : shader(FLAT) {

        // empty

    }

    std::string type;

    aiColor3D rgb;

    float alpha{ 0.0f };

    float exp{ 0.0f };

    float ior{ 0.0f };

    float ka{ 0.0f };

    float ks{ 1.0f };

    unsigned int matnum{ UINT_MAX };

    Shader shader;

    AutoFacet autofacet{FACETED};

    float autofacet_angle{ 0.0f };

    std::shared_ptr<Texture> tex_env,tex_bump,tex_color;

};

// ------------------

/** Embedded bitmap, for instance for the thumbnail image */

struct Bitmap : ChunkInfo {

    Bitmap() = default;

    struct BitmapHeader {

        // empty

    };

    BitmapHeader head;

    size_t orig_size{ 0u };

    std::vector<char> buff_zipped;

};

using NodeList      = std::deque< std::shared_ptr<Node>>;

using MaterialList = std::vector< Material >;

// ------------------

/** Represents a master COB scene, even if we loaded just a single COB file */

struct Scene {

    NodeList nodes;

    MaterialList materials;

    // becomes *0 later

    Bitmap thumbnail;

};

} // end Assimp::COB

#endif // INCLUDED_AI_COB_SCENE_H