/*

Open Asset Import Library (assimp)

----------------------------------------------------------------------

Copyright (c) 2006-2026, assimp team

All rights reserved.

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with or without modification, are permitted provided that the

following conditions are met:

* Redistributions of source code must retain the above

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following disclaimer.

* Redistributions in binary form must reproduce the above

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*/

#ifndef INCLUDED_AI_IRRXML_WRAPPER

#define INCLUDED_AI_IRRXML_WRAPPER

#include <assimp/ai_assert.h>

#include <assimp/StringUtils.h>

#include <assimp/DefaultLogger.hpp>

#include "BaseImporter.h"

#include "IOStream.hpp"

#include <pugixml.hpp>

#include <istream>

#include <utility>

#include <vector>

namespace Assimp {

/// @brief  Will find a node by its name.

struct find_node_by_name_predicate {

    /// @brief The default constructor.

    find_node_by_name_predicate() = default;

    /// @brief Constructor with the predicate name

    /// @param name    The name.

    explicit find_node_by_name_predicate(const std::string &name) : mName(name) {

        // empty

    }

    std::string mName; ///< The name to find.

    bool operator()(pugi::xml_node node) const {

        return node.name() == mName;

    }

};

/// @brief  Will convert an attribute to its int value.

/// @tparam[in] TNodeType  The node type.

template <class TNodeType>

struct NodeConverter {

public:

    /// @brief Will convert the attribute from the node to an int.

    /// @param node            The XML-node.

    /// @param attribName      The name of the attribute.

    static int to_int(TNodeType &node, const char *attribName) {

        ai_assert(nullptr != attribName);

        return node.attribute(attribName).to_int();

    }

};

using XmlNode = pugi::xml_node;

using XmlAttribute = pugi::xml_attribute;

/// @brief The Xml-Parser class.

///

/// Use this parser if you have to import any kind of xml-format.

///

/// An example:

/// @code

/// TXmlParser<XmlNode> theParser;

/// if (theParser.parse(fileStream)) {

///     auto node = theParser.getRootNode();

///     for ( auto currentNode : node.children()) {

///         // Will loop over all children

///     }

/// }

/// @endcode

/// @tparam TNodeType

template <class TNodeType>

class TXmlParser {

public:

    /// @brief The default class constructor.

    TXmlParser();

    /// @brief  The class destructor.

    ~TXmlParser();

    /// @brief  Will clear the parsed xml-file.

    void clear();

    /// @brief  Will search for a child-node by its name

    /// @param[in] name     The name of the child-node.

    /// @return The node instance or nullptr, if nothing was found.

    TNodeType *findNode(const std::string &name);

    /// @brief  Will return true, if the node is a child-node.

    /// @param[in]  name    The name of the child node to look for.

    /// @return true, if the node is a child-node or false if not.

    bool hasNode(const std::string &name);

    /// @brief  Will parse an xml-file from a given stream.

    /// @param[in] stream      The input stream.

    /// @return true, if the parsing was successful, false if not.

    bool parse(IOStream *stream);

    /// @brief  Will parse an xml-file from a stringstream.

    /// @param[in] str      The input istream (note: not "const" to match pugixml param)

    /// @return true, if the parsing was successful, false if not.

    bool parse(std::istream &inStream);

    /// @brief  Will return true if a root node is there.

    /// @return true in case of an existing root.

    bool hasRoot() const;

    /// @brief  Will return the document pointer, is nullptr if no xml-file was parsed.

    /// @return The pointer showing to the document.

    pugi::xml_document *getDocument() const;

    /// @brief  Will return the root node, const version.

    /// @return The root node.

    const TNodeType getRootNode() const;

    /// @brief  Will return the root node, non-const version.

    /// @return The root node.

    TNodeType getRootNode();

    /// @brief Will check if a node with the given name is in.

    /// @param[in] node     The node to look in.

    /// @param[in] name     The name of the child-node.

    /// @return true, if node was found, false if not.

    static inline bool hasNode(XmlNode &node, const char *name);

    /// @brief Will check if an attribute is part of the XmlNode.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @return true, if the was found, false if not.

    static inline bool hasAttribute(XmlNode &xmlNode, const char *name);

    /// @brief Will try to get an unsigned int attribute value.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @param[out] val     The unsigned int value from the attribute.

    /// @return true, if the node contains an attribute with the given name and if the value is an unsigned int.

    static inline bool getUIntAttribute(XmlNode &xmlNode, const char *name, unsigned int &val);

    /// @brief Will try to get an int attribute value.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @param[out] val     The int value from the attribute.

    /// @return true, if the node contains an attribute with the given name and if the value is an int.

    static inline bool getIntAttribute(XmlNode &xmlNode, const char *name, int &val);

    /// @brief Will try to get a real attribute value.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @param[out] val     The real value from the attribute.

    /// @return true, if the node contains an attribute with the given name and if the value is a real.

    static inline bool getRealAttribute(XmlNode &xmlNode, const char *name, ai_real &val);

    /// @brief Will try to get a float attribute value.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @param[out] val     The float value from the attribute.

    /// @return true, if the node contains an attribute with the given name and if the value is a float.

    static inline bool getFloatAttribute(XmlNode &xmlNode, const char *name, float &val);

    /// @brief Will try to get a double attribute value.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @param[out] val     The double value from the attribute.

    /// @return true, if the node contains an attribute with the given name and if the value is a double.

    static inline bool getDoubleAttribute(XmlNode &xmlNode, const char *name, double &val);

    /// @brief Will try to get a std::string attribute value.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @param[out] val     The std::string value from the attribute.

    /// @return true, if the node contains an attribute with the given name and if the value is a std::string.

    static inline bool getStdStrAttribute(XmlNode &xmlNode, const char *name, std::string &val);

    /// @brief Will try to get a bool attribute value.

    /// @param[in] xmlNode  The node to search in.

    /// @param[in] name     The attribute name to look for.

    /// @param[out] val     The bool value from the attribute.

    /// @return true, if the node contains an attribute with the given name and if the value is a bool.

    static inline bool getBoolAttribute(XmlNode &xmlNode, const char *name, bool &val);

    /// @brief Will try to get the value of the node as a string.

    /// @param[in] node     The node to search in.

    /// @param[out] text    The value as a text.

    /// @return true, if the value can be read out.

    static inline bool getValueAsString(XmlNode &node, std::string &text);

    /// @brief Will try to get the value of the node as a real.

    /// @param[in]  node   The node to search in.

    /// @param[out] v      The value as a ai_real.

    /// @return true, if the value can be read out.

    static inline bool getValueAsReal(XmlNode &node, ai_real &v);

    /// @brief Will try to get the value of the node as a float.

    /// @param[in] node     The node to search in.

    /// @param[out]v        The value as a float.

    /// @return true, if the value can be read out.

    static inline bool getValueAsFloat(XmlNode &node, float &v);

    /// @brief Will try to get the value of the node as an integer.

    /// @param[in]  node    The node to search in.

    /// @param[out] i       The value as a int.

    /// @return true, if the value can be read out.

    static inline bool getValueAsInt(XmlNode &node, int &v);

    /// @brief Will try to get the value of the node as an bool.

    /// @param[in]  node    The node to search in.

    /// @param[out] v       The value as a bool.

    /// @return true, if the value can be read out.

    static inline bool getValueAsBool(XmlNode &node, bool &v);

private:

    pugi::xml_document *mDoc;

    TNodeType mCurrent;

    std::vector<char> mData;

};

template <class TNodeType>

inline TXmlParser<TNodeType>::TXmlParser() :

        mDoc(nullptr),

        mData() {

    // empty

}

template <class TNodeType>

inline TXmlParser<TNodeType>::~TXmlParser() {

    clear();

}

template <class TNodeType>

inline void TXmlParser<TNodeType>::clear() {

    if (mData.empty()) {

        if (mDoc) {

            delete mDoc;

        }

        mDoc = nullptr;

        return;

    }

    mData.clear();

    delete mDoc;

    mDoc = nullptr;

}

template <class TNodeType>

inline TNodeType *TXmlParser<TNodeType>::findNode(const std::string &name) {

    if (name.empty()) {

        return nullptr;

    }

    if (nullptr == mDoc) {

        return nullptr;

    }

    find_node_by_name_predicate predicate(name);

    mCurrent = mDoc->find_node(std::move(predicate));

    if (mCurrent.empty()) {

        return nullptr;

    }

    return &mCurrent;

}

template <class TNodeType>

bool TXmlParser<TNodeType>::hasNode(const std::string &name) {

    return nullptr != findNode(name);

}

template <class TNodeType>

bool TXmlParser<TNodeType>::parse(IOStream *stream) {

    if (hasRoot()) {

        clear();

    }

    if (nullptr == stream) {

        ASSIMP_LOG_DEBUG("Stream is nullptr.");

        return false;

    }

    const size_t len = stream->FileSize();

    mData.resize(len + 1);

    memset(&mData[0], '\0', len + 1);

    stream->Read(&mData[0], 1, len);

    mDoc = new pugi::xml_document();

    // load_string assumes native encoding (aka always utf-8 per build options)

    //pugi::xml_parse_result parse_result = mDoc->load_string(&mData[0], pugi::parse_full);

    pugi::xml_parse_result parse_result = mDoc->load_buffer(&mData[0], mData.size(), pugi::parse_full);

    if (parse_result.status == pugi::status_ok) {

        return true;

    }

    ASSIMP_LOG_DEBUG("Error while parse xml.", std::string(parse_result.description()), " @ ", parse_result.offset);

    return false;

}

template <class TNodeType>

bool TXmlParser<TNodeType>::parse(std::istream &inStream) {

    if (hasRoot()) {

        clear();

    }

    mDoc = new pugi::xml_document();

    pugi::xml_parse_result parse_result = mDoc->load(inStream);

    if (parse_result.status == pugi::status_ok) {

        return true;

    }

    ASSIMP_LOG_DEBUG("Error while parse xml.", std::string(parse_result.description()), " @ ", parse_result.offset);

    return false;

}

template <class TNodeType>

bool TXmlParser<TNodeType>::hasRoot() const {

    return nullptr != mDoc;

}

template <class TNodeType>

pugi::xml_document *TXmlParser<TNodeType>::getDocument() const {

    return mDoc;

}

template <class TNodeType>

const TNodeType TXmlParser<TNodeType>::getRootNode() const {

    static pugi::xml_node none;

    if (nullptr == mDoc) {

        return none;

    }

    return mDoc->root();

}

template <class TNodeType>

TNodeType TXmlParser<TNodeType>::getRootNode() {

    static pugi::xml_node none;

    if (nullptr == mDoc) {

        return none;

    }

    return mDoc->root();

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::hasNode(XmlNode &node, const char *name) {

    pugi::xml_node child = node.find_child(find_node_by_name_predicate(name));

    return !child.empty();

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::hasAttribute(XmlNode &xmlNode, const char *name) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    return !attr.empty();

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getUIntAttribute(XmlNode &xmlNode, const char *name, unsigned int &val) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    if (attr.empty()) {

        return false;

    }

    val = attr.as_uint();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getIntAttribute(XmlNode &xmlNode, const char *name, int &val) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    if (attr.empty()) {

        return false;

    }

    val = attr.as_int();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getRealAttribute(XmlNode &xmlNode, const char *name, ai_real &val) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    if (attr.empty()) {

        return false;

    }

#ifdef ASSIMP_DOUBLE_PRECISION

    val = attr.as_double();

#else

    val = attr.as_float();

#endif

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getFloatAttribute(XmlNode &xmlNode, const char *name, float &val) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    if (attr.empty()) {

        return false;

    }

    val = attr.as_float();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getDoubleAttribute(XmlNode &xmlNode, const char *name, double &val) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    if (attr.empty()) {

        return false;

    }

    val = attr.as_double();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getStdStrAttribute(XmlNode &xmlNode, const char *name, std::string &val) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    if (attr.empty()) {

        return false;

    }

    val = attr.as_string();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getBoolAttribute(XmlNode &xmlNode, const char *name, bool &val) {

    pugi::xml_attribute attr = xmlNode.attribute(name);

    if (attr.empty()) {

        return false;

    }

    val = attr.as_bool();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getValueAsString(XmlNode &node, std::string &text) {

    text = std::string();

    if (node.empty()) {

        return false;

    }

    text = node.text().as_string();

    text = ai_trim(text);

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getValueAsReal(XmlNode& node, ai_real& v) {

    if (node.empty()) {

        return false;

    }

    v = node.text().as_float();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getValueAsFloat(XmlNode &node, float &v) {

    if (node.empty()) {

        return false;

    }

    v = node.text().as_float();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getValueAsInt(XmlNode &node, int &v) {

    if (node.empty()) {

        return false;

    }

    v = node.text().as_int();

    return true;

}

template <class TNodeType>

inline bool TXmlParser<TNodeType>::getValueAsBool(XmlNode &node, bool &v) {

    if (node.empty()) {

        return false;

    }

    v = node.text().as_bool();

    return true;

}

using XmlParser = TXmlParser<pugi::xml_node>;

/// @brief  This class declares an iterator to loop through all children of the root node.

class XmlNodeIterator {

public:

    /// @brief The iteration mode.

    enum IterationMode {

        PreOrderMode, ///< Pre-ordering, get the values, continue the iteration.

        PostOrderMode ///< Post-ordering, continue the iteration, get the values.

    };

    /// @brief  The class constructor

    /// @param  parent      [in] The xml parent to to iterate through.

    /// @param  mode        [in] The iteration mode.

    explicit XmlNodeIterator(XmlNode &parent, IterationMode mode) :

            mParent(parent),

            mNodes(),

            mIndex(0) {

        if (mode == PreOrderMode) {

            collectChildrenPreOrder(parent);

        } else {

            collectChildrenPostOrder(parent);

        }

    }

    /// @brief  The class destructor, default implementation.

    ~XmlNodeIterator() = default;

    /// @brief  Will iterate through all children in pre-order iteration.

    /// @param  node    [in] The nod to iterate through.

    void collectChildrenPreOrder(XmlNode &node) {

        if (node != mParent && node.type() == pugi::node_element) {

            mNodes.push_back(node);

        }

        for (XmlNode currentNode : node.children()) {

            collectChildrenPreOrder(currentNode);

        }

    }

    /// @brief  Will iterate through all children in post-order iteration.

    /// @param  node    [in] The nod to iterate through.

    void collectChildrenPostOrder(XmlNode &node) {

        for (XmlNode currentNode = node.first_child(); currentNode; currentNode = currentNode.next_sibling()) {

            collectChildrenPostOrder(currentNode);

        }

        if (node != mParent) {

            mNodes.push_back(node);

        }

    }

    /// @brief  Will iterate through all collected nodes.

    /// @param  next    The next node, if there is any.

    /// @return true, if there is a node left.

    bool getNext(XmlNode &next) {

        if (mIndex == mNodes.size()) {

            return false;

        }

        next = mNodes[mIndex];

        ++mIndex;

        return true;

    }

    /// @brief  Will return the number of collected nodes.

    /// @return The number of collected nodes.

    size_t size() const {

        return mNodes.size();

    }

    /// @brief  Returns true, if the node is empty.

    /// @return true, if the node is empty, false if not.

    bool isEmpty() const {

        return mNodes.empty();

    }

    /// @brief  Will clear all collected nodes.

    void clear() {

        if (mNodes.empty()) {

            return;

        }

        mNodes.clear();

        mIndex = 0;

    }

private:

    XmlNode &mParent;

    std::vector<XmlNode> mNodes;

    size_t mIndex;

};

} // namespace Assimp

#endif // !! INCLUDED_AI_IRRXML_WRAPPER