/*

Open Asset Import Library (assimp)

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  copyright notice, this list of conditions and the

  following disclaimer.

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*/

/** @file  FBXParser.h

 *  @brief FBX parsing code

 */

#ifndef INCLUDED_AI_FBX_PARSER_H

#define INCLUDED_AI_FBX_PARSER_H

#include <stdint.h>

#include <map>

#include <memory>

#include <vector>

#include <assimp/LogAux.h>

#include <assimp/fast_atof.h>

#include "Common/StackAllocator.h"

#include "FBXCompileConfig.h"

#include "FBXTokenizer.h"

namespace Assimp {

namespace FBX {

class Scope;

class Parser;

class Element;

using ScopeList = std::vector<Scope*>;

using ElementMap = std::fbx_unordered_multimap< std::string, Element*>;

using ElementCollection = std::pair<ElementMap::const_iterator,ElementMap::const_iterator>;

#define new_Scope new (allocator.Allocate(sizeof(Scope))) Scope

#define new_Element new (allocator.Allocate(sizeof(Element))) Element

#define delete_Scope(_p) (_p)->~Scope()

#define delete_Element(_p) (_p)->~Element()

/** FBX data entity that consists of a key:value tuple.

 *

 *  Example:

 *  @verbatim

 *    AnimationCurve: 23, "AnimCurve::", "" {

 *        [..]

 *    }

 *  @endverbatim

 *

 *  As can be seen in this sample, elements can contain nested #Scope

 *  as their trailing member.

**/

class Element {

public:

    Element(const Token& key_token, Parser& parser);

    ~Element();

    const Scope* Compound() const {

        return compound;

    }

    const Token& KeyToken() const {

        return key_token;

    }

    const TokenList& Tokens() const {

        return tokens;

    }

private:

    const Token& key_token;

    TokenList tokens;

    Scope* compound;

};

/** FBX data entity that consists of a 'scope', a collection

 *  of not necessarily unique #Element instances.

 *

 *  Example:

 *  @verbatim

 *    GlobalSettings:  {

 *        Version: 1000

 *        Properties70:

 *        [...]

 *    }

 *  @endverbatim  */

class Scope

{

public:

    Scope(Parser& parser, bool topLevel = false);

    ~Scope();

    const Element* operator[] (const std::string& index) const {

        ElementMap::const_iterator it = elements.find(index);

        return it == elements.end() ? nullptr : (*it).second;

    }

  const Element* FindElementCaseInsensitive(const std::string& elementName) const {

    const char* elementNameCStr = elementName.c_str();

    for (auto element = elements.begin(); element != elements.end(); ++element)

    {

            if (!ASSIMP_strincmp(element->first.c_str(), elementNameCStr, AI_MAXLEN)) {

        return element->second;

      }

    }

        return nullptr;

  }

    ElementCollection GetCollection(const std::string& index) const {

        return elements.equal_range(index);

    }

    const ElementMap& Elements() const  {

        return elements;

    }

private:

    ElementMap elements;

};

/** FBX parsing class, takes a list of input tokens and generates a hierarchy

 *  of nested #Scope instances, representing the fbx DOM.*/

class Parser

{

public:

    /** Parse given a token list. Does not take ownership of the tokens -

     *  the objects must persist during the entire parser lifetime */

    Parser(const TokenList &tokens, StackAllocator &allocator, bool is_binary);

    ~Parser();

    const Scope& GetRootScope() const {

        return *root;

    }

    bool IsBinary() const {

        return is_binary;

    }

    StackAllocator &GetAllocator() {

        return allocator;

    }

private:

    friend class Scope;

    friend class Element;

    TokenPtr AdvanceToNextToken();

    TokenPtr LastToken() const;

    TokenPtr CurrentToken() const;

private:

    const TokenList& tokens;

    StackAllocator &allocator;

    TokenPtr last, current;

    TokenList::const_iterator cursor;

    Scope *root;

    const bool is_binary;

};

/* token parsing - this happens when building the DOM out of the parse-tree*/

uint64_t ParseTokenAsID(const Token& t, const char*& err_out);

size_t ParseTokenAsDim(const Token& t, const char*& err_out);

float ParseTokenAsFloat(const Token& t, const char*& err_out);

int ParseTokenAsInt(const Token& t, const char*& err_out);

int64_t ParseTokenAsInt64(const Token& t, const char*& err_out);

std::string ParseTokenAsString(const Token& t, const char*& err_out);

/* wrapper around ParseTokenAsXXX() with DOMError handling */

uint64_t ParseTokenAsID(const Token& t);

size_t ParseTokenAsDim(const Token& t);

float ParseTokenAsFloat(const Token& t);

int ParseTokenAsInt(const Token& t);

int64_t ParseTokenAsInt64(const Token& t);

std::string ParseTokenAsString(const Token& t);

/* read data arrays */

void ParseVectorDataArray(std::vector<aiVector3D>& out, const Element& el);

void ParseVectorDataArray(std::vector<aiColor4D>& out, const Element& el);

void ParseVectorDataArray(std::vector<aiVector2D>& out, const Element& el);

void ParseVectorDataArray(std::vector<int>& out, const Element& el);

void ParseVectorDataArray(std::vector<float>& out, const Element& el);

void ParseVectorDataArray(std::vector<unsigned int>& out, const Element& el);

void ParseVectorDataArray(std::vector<uint64_t>& out, const Element& e);

void ParseVectorDataArray(std::vector<int64_t>& out, const Element& el);

bool HasElement( const Scope& sc, const std::string& index );

// extract a required element from a scope, abort if the element cannot be found

const Element &GetRequiredElement(const Scope &sc, const std::string &index, const Element *element = nullptr);

// extract required compound scope

const Scope& GetRequiredScope(const Element& el);

// get token at a particular index

const Token& GetRequiredToken(const Element& el, unsigned int index);

// read a 4x4 matrix from an array of 16 floats

aiMatrix4x4 ReadMatrix(const Element& element);

} // ! FBX

} // ! Assimp

#endif // ! INCLUDED_AI_FBX_PARSER_H