/*

Open Asset Import Library (assimp)

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  following disclaimer.

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*/

/** @file  FBXProperties.cpp

 *  @brief Implementation of the FBX dynamic properties system

 */

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include "FBXTokenizer.h"

#include "FBXParser.h"

#include "FBXDocument.h"

#include "FBXDocumentUtil.h"

#include "FBXProperties.h"

#include <utility>

namespace Assimp {

namespace FBX {

using namespace Util;

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

namespace {

    void checkTokenCount(const TokenList &tok, unsigned int expectedCount) {

        ai_assert(expectedCount >= 2);

        if (tok.size() < expectedCount) {

            const std::string &s = ParseTokenAsString(*tok[1]);

            if (tok[1]->IsBinary()) {

                throw DeadlyImportError("Not enough tokens for property of type ", s, " at offset ", tok[1]->Offset());

            } else {

                throw DeadlyImportError("Not enough tokens for property of type ", s, " at line ", tok[1]->Line());

            }

        }

}

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

// read a typed property out of a FBX element. The return value is nullptr if the property cannot be read.

Property* ReadTypedProperty(const Element& element)

{

    ai_assert(element.KeyToken().StringContents() == "P");

    const TokenList& tok = element.Tokens();

    if (tok.size() < 2) {

        return nullptr;

    }

    const std::string& s = ParseTokenAsString(*tok[1]);

    const char* const cs = s.c_str();

    if (!strcmp(cs,"KString")) {

        checkTokenCount(tok, 5);

        return new TypedProperty<std::string>(ParseTokenAsString(*tok[4]));

    }

    else if (!strcmp(cs,"bool") || !strcmp(cs,"Bool")) {

        checkTokenCount(tok, 5);

        return new TypedProperty<bool>(ParseTokenAsInt(*tok[4]) != 0);

    }

    else if (!strcmp(cs, "int") || !strcmp(cs, "Int") || !strcmp(cs, "enum") || !strcmp(cs, "Enum") || !strcmp(cs, "Integer")) {

        checkTokenCount(tok, 5);

        return new TypedProperty<int>(ParseTokenAsInt(*tok[4]));

    }

    else if (!strcmp(cs, "ULongLong")) {

        checkTokenCount(tok, 5);

        return new TypedProperty<uint64_t>(ParseTokenAsID(*tok[4]));

    }

    else if (!strcmp(cs, "KTime")) {

        checkTokenCount(tok, 5);

        return new TypedProperty<int64_t>(ParseTokenAsInt64(*tok[4]));

    }

    else if (!strcmp(cs,"Vector3D") ||

        !strcmp(cs,"ColorRGB") ||

        !strcmp(cs,"Vector") ||

        !strcmp(cs,"Color") ||

        !strcmp(cs,"Lcl Translation") ||

        !strcmp(cs,"Lcl Rotation") ||

        !strcmp(cs,"Lcl Scaling")

        ) {

        checkTokenCount(tok, 7);

        return new TypedProperty<aiVector3D>(aiVector3D(

            ParseTokenAsFloat(*tok[4]),

            ParseTokenAsFloat(*tok[5]),

            ParseTokenAsFloat(*tok[6]))

        );

    }

    else if (!strcmp(cs,"double") || !strcmp(cs,"Number") || !strcmp(cs,"float") || !strcmp(cs,"Float") || !strcmp(cs,"FieldOfView") || !strcmp( cs, "UnitScaleFactor" ) ) {

        checkTokenCount(tok, 5);

        return new TypedProperty<float>(ParseTokenAsFloat(*tok[4]));

    }

    else if (!strcmp(cs, "ColorAndAlpha")) {

        checkTokenCount(tok, 8);

        return new TypedProperty<aiColor4D>(aiColor4D(

            ParseTokenAsFloat(*tok[4]),

            ParseTokenAsFloat(*tok[5]),

            ParseTokenAsFloat(*tok[6]),

            ParseTokenAsFloat(*tok[7]))

        );

    }

    return nullptr;

}

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

// peek into an element and check if it contains a FBX property, if so return its name.

std::string PeekPropertyName(const Element& element) {

    ai_assert(element.KeyToken().StringContents() == "P");

    const TokenList& tok = element.Tokens();

    if(tok.size() < 4) {

        return std::string();

    }

    return ParseTokenAsString(*tok[0]);

}

} //! anon

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

PropertyTable::PropertyTable(const Element &element, std::shared_ptr<const PropertyTable> templateProps) :

        templateProps(std::move(templateProps)), element(&element) {

    const Scope& scope = GetRequiredScope(element);

    for(const ElementMap::value_type& v : scope.Elements()) {

        if(v.first != "P") {

            DOMWarning("expected only P elements in property table",v.second);

            continue;

        }

        const std::string& name = PeekPropertyName(*v.second);

        if(!name.length()) {

            DOMWarning("could not read property name",v.second);

            continue;

        }

        LazyPropertyMap::const_iterator it = lazyProps.find(name);

        if (it != lazyProps.end()) {

            DOMWarning("duplicate property name, will hide previous value: " + name,v.second);

            continue;

        }

        lazyProps[name] = v.second;

    }

}

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

PropertyTable::~PropertyTable()

{

    for(PropertyMap::value_type& v : props) {

        delete v.second;

    }

}

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

const Property* PropertyTable::Get(const std::string& name) const

{

    PropertyMap::const_iterator it = props.find(name);

    if (it == props.end()) {

        // hasn't been parsed yet?

        LazyPropertyMap::const_iterator lit = lazyProps.find(name);

        if(lit != lazyProps.end()) {

            props[name] = ReadTypedProperty(*(*lit).second);

            it = props.find(name);

            ai_assert(it != props.end());

        }

        if (it == props.end()) {

            // check property template

            if(templateProps) {

                return templateProps->Get(name);

            }

            return nullptr;

        }

    }

    return (*it).second;

}

DirectPropertyMap PropertyTable::GetUnparsedProperties() const

{

    DirectPropertyMap result;

    // Loop through all the lazy properties (which is all the properties)

    for(const LazyPropertyMap::value_type& currentElement : lazyProps) {

        // Skip parsed properties

        if (props.end() != props.find(currentElement.first)) {

            continue;

        }

        // Read the element's value.

        // Wrap the naked pointer (since the call site is required to acquire ownership)

        std::shared_ptr<Property> prop = std::shared_ptr<Property>(ReadTypedProperty(*currentElement.second));

        // Element could not be read. Skip it.

        if (!prop) {

            continue;

        }

        // Add to result

        result[currentElement.first] = prop;

    }

    return result;

}

} //! FBX

} //! Assimp

#endif