#if !defined(RESIP_PARSERCATEGORY_HXX)
#define RESIP_PARSERCATEGORY_HXX 

#include <iosfwd>
#include <vector>
#include <set>
#include "resip/stack/HeaderTypes.hxx"
#include "resip/stack/LazyParser.hxx"
#include "resip/stack/ParameterTypes.hxx"
#include "rutil/Data.hxx"
#include "rutil/BaseException.hxx"
#include "rutil/StlPoolAllocator.hxx"
#include "rutil/PoolBase.hxx"

#include "rutil/resipfaststreams.hxx"

#define defineParam(_enum, _name, _type, _RFC_ref_ignored)                      \
      const _enum##_Param::DType& param(const _enum##_Param& paramType) const;  \
      _enum##_Param::DType& param(const _enum##_Param& paramType)

namespace resip
{
class UnknownParameter;
class ExtensionParameter;
class Parameter;
class ParseBuffer;

/**
   @brief Base class for all SIP grammar elements that can have parameters.

   The pattern for accessing the parameters in a ParserCategory is very similar
   to accessing headers in a SipMessage. Each parameter type has an access token
   class (a subclass of ParamBase), and a corresponding ParserCategory::param() 
   function that takes an instance of that subclass as an argument, and returns
   the correct type for that parameter. Common examples of access-token include 
   p_tag, p_q, p_lr, p_expires, p_branch, etc.

   @code
      NameAddr& contact = sip.header(h_Contacts).front();
      if(contact.exists(p_q))
      {
         QValueParameter& q = contact.param(p_q);
         // do stuff with q
      }

      NameAddr& to = sip.header(h_To);
      if(to.exists(p_tag))
      {
         DataParameter& toTag = to.param(p_tag);
         // do stuff with toTag
      }

      Via& topVia = sip.header(h_Vias).front();
      if(topVia.exists(p_branch))
      {
         BranchParameter& branch = topVia.param(p_branch);
         // do stuff with branch
      }
   @endcode

   Note the calls to ParserCategory::exists() in the code above; calling 
   ParserCategory::param() when the relevant parameter doesn't exist will either
   cause the parameter to be created, or an exception to be thrown (if you're
   working with a const reference).

   In some cases, you will need to access parameter-types that are not natively 
   supported by the stack (ie, don't have an access-token). ExtensionParameter 
   will allow you to construct an access-token at runtime that will retrieve the
   parameter as a raw Data. Here's an example:

   @code
      // We need to access the foo parameter on the Request-Uri
      RequestLine& rLine = sip.header(h_RequestLine);
      static ExtensionParameter p_foo("foo");
      if(rLine.uri().exists(p_foo))
      {
         Data& foo = rLine.uri().param(p_foo);
      }
   @endcode

   @todo Maybe a better name? IHaveParams? ElemWithParams?
   @ingroup resip_crit
*/
class ParserCategory : public LazyParser
{
    public:
      enum {UnknownParserCategory = -1};

      // NoCommaTokenizing:        commas do not indicate a new header value
      // CommasAllowedOutputMulti: multi headers can be received with commas but
      //                           output them on separate lines.
      // CommasAllowedOutputCommas: multi headers can be received with commas
      //                            and will always output with commas when
      //                            parsed.  
      enum {NoCommaTokenizing = 0, CommasAllowedOutputMulti = 1, CommasAllowedOutputCommas = 3};

      /**
         @internal
         @brief Constructor used by SipMessage. Unless you _really_ know what
            you're doing, don't touch this.
      */
      ParserCategory(const HeaderFieldValue& headerFieldValue, 
                     Headers::Type type,
                     PoolBase* pool=0);

      /**
         @internal
         @brief Constructor used by SipMessage. Unless you _really_ know what
            you're doing, don't touch this.
      */
      ParserCategory(const char* buf, 
                     int length, 
                     Headers::Type type,
                     PoolBase* pool=0);

      /**
         @internal
         @brief Copy c'tor.
      */
      ParserCategory(const ParserCategory& rhs,
                     PoolBase* pool=0);

      /**
         @internal
         @brief Assignment operator.
      */
      ParserCategory& operator=(const ParserCategory& rhs);

      virtual ~ParserCategory();

      virtual ParserCategory* clone() const = 0;
      virtual Parameter* createParam(ParameterTypes::Type type, ParseBuffer& pb, const std::bitset<256>& terminators, PoolBase* pool);

      // Do a placement new
      virtual ParserCategory* clone(void* location) const = 0;

      // Do a pool allocated new
      virtual ParserCategory* clone(PoolBase* pool) const = 0;

      /**
         @brief Checks for the existence of a natively supported parameter.
         @param paramType The accessor token for the parameter.
         @return true iff the parameter is present.
      */
      inline bool exists(const ParamBase& paramType) const
      {
          checkParsed();
          return (getParameterByEnum(paramType.getTypeNum()) != NULL);
      }

      /**
         @brief Removes a natively supported parameter, if the parameter is 
            present.
         @param paramType The accessor token for the parameter.
      */
      void remove(const ParamBase& paramType);

      // !dlb! causes compiler error in windows -- change template to const T*
      /**
         @brief Const accessor for non-natively-supported parameter types.
         @throw ParserCategory::Exception if this parameter doesn't exist.
         @param param The runtime constructed parameter accessor.
         @return The parameter, as a raw Data.
      */
      const Data& param(const ExtensionParameter& param) const;
      
      /**
         @brief Accessor for non-natively-supported parameter types.
            Will create the parameter if it does not exist.
         @param param The runtime constructed parameter accessor.
         @return The parameter, as a raw Data.
      */
      Data& param(const ExtensionParameter& param);

      /**
         @brief Removes a non-natively-supported parameter, if the parameter is 
            present.
         @param param The accessor token for the parameter.
      */
      void remove(const ExtensionParameter& param); 

      /**
         @brief Checks for the existence of a non-natively-supported parameter.
         @param param The runtime constructed accessor token.
         @return true iff the parameter is present.
      */
      bool exists(const ExtensionParameter& param) const;

      typedef std::set<ParameterTypes::Type> ParameterTypeSet;      
      
      static const ParameterTypeSet EmptyParameterTypeSet;      

      /**
         @brief Removes all known parameters except those that are specified in 
            set.
         @param set The set of parameters to retain, as an enum.
         @note This does not remove unknown parameters.
      */
      void removeParametersExcept(const ParameterTypeSet& set = EmptyParameterTypeSet);
      void clearUnknownParameters();

      /**
         @brief Exception class used by ParserCategory.
      */
      class Exception final : public BaseException
      {
         public:
            Exception(const Data& msg, const Data& file, const int line)
               : BaseException(msg, file, line) {}

            const char* name() const noexcept override { return "ParserCategory::Exception"; }
      };

      /**
         @internal
         @brief Causes this ParserCategory to parse parameters out of pb.
         @param pb The ParseBuffer to parse params from.
      */
      void parseParameters(ParseBuffer& pb);

      /**
         @brief Encodes parameters as they should appear on the wire.
         @param str The ostream to encode to.
         @return str
      */
      EncodeStream& encodeParameters(EncodeStream& str) const;
      
      // used to compare 2 parameter lists for equality in an order independent way
      /**
         @internal
         @brief An order-sensitive hash over the set of parameters in this 
            ParserCategory.
         @return The hash value as a Data.
      */
      Data commutativeParameterHash() const;
      
      /**
         @internal
         @brief Typeless parameter get interface.
      */
      Parameter* getParameterByEnum(ParameterTypes::Type type) const;

      /**
         @internal
         @brief Removes a parameter.
         @param type The parameter type.
      */
      void removeParameterByEnum(ParameterTypes::Type type);

      /**
         @internal
         @brief Typeless parameter put interface.
      */
      void setParameter(const Parameter* parameter);

      /**
         @brief Returns the number of known (natively supported) parameters.
      */
      int numKnownParams() const {return (int)mParameters.size();};

      /**
         @brief Returns the number of unknown parameters.
      */
      int numUnknownParams() const {return (int)mUnknownParameters.size();};

   protected:
      ParserCategory(PoolBase* pool=0);

      /**
         @internal
         @brief Adds a recognised parameter to the internal ParameterList.
         @param param The parameter to add.
         @note Skips duplicate parameters.
      */
      bool addParameter(Parameter* param);

      /**
         @internal
         @brief Adds an unrecognised parameter to the internal ParameterList.
         @param unknownParam The parameter to add.
         @note Skips duplicate parameters.
      */
      bool addParameter(UnknownParameter* unknownParam);

      Parameter* getParameterByData(const Data& data) const;
      void removeParameterByData(const Data& data);
      inline PoolBase* getPool()
      {
         return mPool;
      }

      inline void freeParameter(Parameter* p)
      {
         if(p)
         {
            p->~Parameter();
            if(mPool)
            {
               mPool->deallocate(p);
               return;
            }
            ::operator delete(p);
         }
      }

      virtual const Data& errorContext() const;

      typedef std::vector<Parameter*, StlPoolAllocator<Parameter*, PoolBase> > ParameterList; 
      ParameterList mParameters;
      ParameterList mUnknownParameters;
      PoolBase* mPool;
      Headers::Type mHeaderType;
   private:
      void clear();
      void copyParametersFrom(const ParserCategory& other);
      friend EncodeStream& operator<<(EncodeStream&, const ParserCategory&);
      friend class NameAddr;
};

EncodeStream&
operator<<(EncodeStream&, const ParserCategory& category);

}

#undef defineParam

#endif

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