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

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
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* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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