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

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  following disclaimer.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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;

// ------------------------------------------------------------------------------------------------
Property::Property()
{
}

// ------------------------------------------------------------------------------------------------
Property::~Property()
{
}

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()
: templateProps()
, element()
{
}

// ------------------------------------------------------------------------------------------------
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::unique_ptr from C++11 would be preferred both as a wrapper and a return value.
        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
