//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
// $NoKeywords: $
//
//=============================================================================//

#ifndef DATATABLE_COMMON_H
#define DATATABLE_COMMON_H

#ifdef _WIN32
#pragma once
#endif	

#include "basetypes.h"
#include "tier0/dbg.h"
#include "vstdlib/strtools.h"


// Max number of properties in a datatable and its children.
#define MAX_DATATABLES		1024	// must be a power of 2.
#define MAX_DATATABLE_PROPS	1024

#define MAX_ARRAY_ELEMENTS	256		// a network array should have more that 128 elements

#define HIGH_DEFAULT		-121121.121121f

#define BITS_FULLRES	-1	// Use the full resolution of the type being encoded.
#define BITS_WORLDCOORD	-2	// Encode as a world coordinate.

#define DT_MAX_STRING_BITS			9
#define DT_MAX_STRING_BUFFERSIZE	(1<<DT_MAX_STRING_BITS)	// Maximum length of a string that can be sent.

#ifndef offsetof
#define offsetof(s,m)	(size_t)&(((s *)0)->m)
#endif

#define STRINGBUFSIZE(className, varName)	sizeof( ((className*)0)->varName )

// Gets the size of a variable in a class.
#define PROPSIZEOF(className, varName)		sizeof(((className*)0)->varName)


// SendProp::m_Flags.
#define SPROP_UNSIGNED			(1<<0)	// Unsigned integer data.

#define SPROP_COORD				(1<<1)	// If this is set, the float/vector is treated like a world coordinate.
										// Note that the bit count is ignored in this case.

#define SPROP_NOSCALE			(1<<2)	// For floating point, don't scale into range, just take value as is.

#define SPROP_ROUNDDOWN			(1<<3)	// For floating point, limit high value to range minus one bit unit

#define SPROP_ROUNDUP			(1<<4)	// For floating point, limit low value to range minus one bit unit

#define SPROP_NORMAL			(1<<5)	// If this is set, the vector is treated like a normal (only valid for vectors)
							
#define SPROP_EXCLUDE			(1<<6)	// This is an exclude prop (not excludED, but it points at another prop to be excluded).

#define SPROP_XYZE				(1<<7)	// Use XYZ/Exponent encoding for vectors.

#define SPROP_INSIDEARRAY		(1<<8)	// This tells us that the property is inside an array, so it shouldn't be put into the
										// flattened property list. Its array will point at it when it needs to.

#define SPROP_PROXY_ALWAYS_YES	(1<<9)	// Set for datatable props using one of the default datatable proxies like
										// SendProxy_DataTableToDataTable that always send the data to all clients.

#define SPROP_CHANGES_OFTEN		(1<<10)	// this is an often changed field, moved to head of sendtable so it gets a small index

#define SPROP_NUMFLAGBITS		11


// Used by the SendProp and RecvProp functions to disable debug checks on type sizes.
#define SIZEOF_IGNORE		-1


// Use this to extern send and receive datatables, and reference them.
#define EXTERN_SEND_TABLE(tableName)	namespace tableName {extern SendTable g_SendTable;}
#define EXTERN_RECV_TABLE(tableName)	namespace tableName {extern RecvTable g_RecvTable;}

#define REFERENCE_SEND_TABLE(tableName)	tableName::g_SendTable
#define REFERENCE_RECV_TABLE(tableName)	tableName::g_RecvTable


class SendProp;


typedef enum
{
	DPT_Int=0,
	DPT_Float,
	DPT_Vector,
	DPT_String,
	DPT_Array,	// An array of the base types (can't be of datatables).
	DPT_DataTable,
	DPT_NUMSendPropTypes
} SendPropType;


class DVariant
{
public:
				DVariant()				{m_Type = DPT_Float;}
				DVariant(float val)		{m_Type = DPT_Float; m_Float = val;}
				
				const char *ToString()
				{
					static char text[128];

					switch ( m_Type )
					{
						case DPT_Int : 
							Q_snprintf( text, sizeof(text), "%i", m_Int );
							break;
						case DPT_Float :
							Q_snprintf( text, sizeof(text), "%.3f", m_Float );
							break;
						case DPT_Vector :
							Q_snprintf( text, sizeof(text), "(%.3f,%.3f,%.3f)", 
								m_Vector[0], m_Vector[1], m_Vector[2] );
							break;
						case DPT_String : 
							if ( m_pString ) 
								return m_pString;
							else
								return "NULL";
							break;
						case DPT_Array :
							Q_snprintf( text, sizeof(text), "Array" ); 
							break;
						case DPT_DataTable :
							Q_snprintf( text, sizeof(text), "DataTable" ); 
							break;
						default :
							Q_snprintf( text, sizeof(text), "DVariant type %i unknown", m_Type ); 
							break;
					}

					return text;
				}

	union
	{
		float	m_Float;
		long	m_Int;
		char	*m_pString;
		void	*m_pData;	// For DataTables.
		float	m_Vector[3];
	};
	SendPropType	m_Type;
};


// This can be used to set the # of bits used to transmit a number between 0 and nMaxElements-1.
inline int NumBitsForCount( int nMaxElements )
{
	int nBits = 0;
	while ( nMaxElements > 0 )
	{
		++nBits;
		nMaxElements >>= 1;
	}
	return nBits;
}


#endif // DATATABLE_COMMON_H
