/*
 * Author:          Patrick-Christopher Mattulat
 * Company:         Lynar Studios
 * E-Mail:          webmaster@lynarstudios.com
 * Created:         2020-10-08
 * Changed:         2020-11-20
 *
 * */

#ifndef LS_STD_XML_READER_HPP
#define LS_STD_XML_READER_HPP

#include <ls_std/base/Class.hpp>
#include "XMLDocument.hpp"
#include <ls_std/io/IReader.hpp>
#include <ls_std/io/File.hpp>
#include "XMLParseMode.hpp"
#include "XMLParseData.hpp"
#include <list>

namespace ls_std {
  class XMLReader : public Class, IReader {
    public:

      explicit XMLReader(const std::shared_ptr<ls_std::XMLDocument>& _document, const std::string& _absolutePath);
      ~XMLReader() = default;

      // implementation

      ls_std::byte_field read() override;

      // additional functionality

      std::shared_ptr<ls_std::XMLDocument> getDocument();
      void setFile(const ls_std::File& _xmlFile);

    protected:

      static std::pair<std::string, std::string> _readAttribute_(const ls_std::byte_field& _data);
      static std::list<std::pair<std::string, std::string>> _readAttributes_(ls_std::byte_field _data);

    private:

      uint8_t currentLevel {};
      std::shared_ptr<ls_std::XMLDocument> document {};
      uint8_t maxLevel {};
      ls_std::XMLParseMode mode {};
      std::list<ls_std::XMLParseData> parseData {};
      ls_std::File xmlFile;

      void _analyze(const ls_std::byte_field &_data, std::string::size_type _index);
      static void _checkDocumentExistence(const std::shared_ptr<ls_std::XMLDocument>& _document);
      static void _checkFileExistence(ls_std::File _xmlFile);
      static std::shared_ptr<ls_std::XMLDeclaration> _createDeclaration(const std::list<std::pair<std::string, std::string>>& _attributes);
      static std::shared_ptr<ls_std::XMLNode> _createNode(const std::list<std::pair<std::string, std::string>>& _attributes, const std::string& _name);
      static std::pair<std::string, std::string> _findAttribute(const std::list<std::pair<std::string, std::string>>& _attributes, const std::string& _name);
      static size_t _findAttributeEndPosition(const ls_std::byte_field& _data);
      static ls_std::byte_field _getNextTagString(const ls_std::byte_field& _data, std::string::size_type _index);
      void _isClosingTag(const ls_std::byte_field& _data, std::string::size_type _index);
      void _isDeclaration(const ls_std::byte_field& _data, std::string::size_type _index);
      void _isOpeningTag(const ls_std::byte_field& _data, std::string::size_type _index);
      void _isValue(const ls_std::byte_field& _data, std::string::size_type _index);
      void _mergeNodes();
      void _mergeChildrenToParentNode(const std::shared_ptr<ls_std::XMLNode>& _parent, std::list<ls_std::XMLParseData>::iterator& _iterator, uint8_t _parentLevel);
      void _mergeNodesOnCurrentLevel();
      void _parse(const ls_std::byte_field& _data);
      static std::pair<std::string, std::string> _parseAttribute(const ls_std::byte_field& _data);
      static std::list<std::pair<std::string, std::string>> _parseAttributes(ls_std::byte_field _data);
      size_t _parseClosingTag(const ls_std::byte_field& _data, std::string::size_type _index);
      size_t _parseDeclaration(const ls_std::byte_field& _data, std::string::size_type _index);
      size_t _parseOpeningTag(const ls_std::byte_field& _data, std::string::size_type _index);
      static ls_std::byte_field _parseTagName(const ls_std::byte_field& _data);
      size_t _parseValue(const ls_std::byte_field& _data, std::string::size_type _index);
      void _reset();
      void _setMaxLevel();
  };
}

#endif