/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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* Redistributions in binary form must reproduce the above
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

----------------------------------------------------------------------
*/

/** @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 {
namespace 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, flags;
    std::vector<VertexIndex> indices;
};

// ------------------
/** COB chunk header information */
const unsigned int NO_SIZE = UINT_MAX;

struct ChunkInfo
{
    ChunkInfo ()
        :   id        (0)
        ,   parent_id (0)
        ,   version   (0)
        ,   size      (NO_SIZE)
    {}

    // Id of this chunk, unique within file
    unsigned int id;

    // and the corresponding parent
    unsigned int parent_id;

    // version. v1.23 becomes 123
    unsigned int version;

    // chunk size in bytes, only relevant for binary files
    // NO_SIZE is also valid.
    unsigned int size;
};

// ------------------
/** A node in the scenegraph */
struct Node : public ChunkInfo
{
    enum Type {
        TYPE_MESH,TYPE_GROUP,TYPE_LIGHT,TYPE_CAMERA,TYPE_BONE
    };

    virtual ~Node() = default;
    Node(Type type) : type(type), unit_scale(1.f){}

    Type type;

    // used during resolving
    typedef std::deque<const Node*> ChildList;
    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 : public 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 : public Node
{
    using ChunkInfo::operator=;
    Group() : Node(TYPE_GROUP) {}
};

// ------------------
/** COB Bone data structure */
struct Bone : public Node
{
    using ChunkInfo::operator=;
    Bone() : Node(TYPE_BONE) {}
};

// ------------------
/** COB Light data structure */
struct Light : public Node
{
    enum LightType {
        SPOT,LOCAL,INFINITE
    };

    using ChunkInfo::operator=;
    Light() : Node(TYPE_LIGHT),angle(),inner_angle(),ltype(SPOT) {}

    aiColor3D color;
    float angle,inner_angle;

    LightType ltype;
};

// ------------------
/** COB Camera data structure */
struct Camera : public Node
{
    using ChunkInfo::operator=;
    Camera() : Node(TYPE_CAMERA) {}
};

// ------------------
/** 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() : alpha(),exp(),ior(),ka(),ks(1.f),
        matnum(UINT_MAX),
        shader(FLAT),autofacet(FACETED),
        autofacet_angle()
    {}

    std::string type;

    aiColor3D rgb;
    float alpha, exp, ior,ka,ks;

    unsigned int matnum;
    Shader shader;

    AutoFacet autofacet;
    float autofacet_angle;

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

// ------------------
/** Embedded bitmap, for instance for the thumbnail image */
struct Bitmap : ChunkInfo
{
    Bitmap() : orig_size() {}
    struct BitmapHeader
    {
    };

    BitmapHeader head;
    size_t orig_size;
    std::vector<char> buff_zipped;
};

typedef std::deque< std::shared_ptr<Node> > NodeList;
typedef std::vector< Material > MaterialList;

// ------------------
/** 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 COB
} // end Assimp

#endif