/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/

#include "hsStream.h"
#include "plAgeDescription.h"
#include "hsUtils.h"
#include "hsStlUtils.h"
#include "../plFile/hsFiles.h"
#include "../plFile/plInitFileReader.h"
#include "../plFile/plEncryptedStream.h"
#include "hsStringTokenizer.h"
#include <functional>
#include <algorithm>


const UInt32	plAgePage::kInvalidSeqSuffix = (UInt32)-1;

plAgePage::plAgePage( const char *name, UInt32 seqSuffix, Byte flags )
{
	fName = name != nil ? hsStrcpy( name ) : nil;
	fSeqSuffix = seqSuffix;
	fFlags = flags;
}

plAgePage::plAgePage( char *stringFrom ) : fName(nil)
{
	SetFromString( stringFrom );
}

plAgePage::plAgePage()
{
	fName = nil;
	fFlags = 0;
	fSeqSuffix = 0;
}

plAgePage::plAgePage( const plAgePage &src ) : fName(nil)
{
	fName = src.fName != nil ? hsStrcpy( src.fName ) : nil;
	fSeqSuffix = src.fSeqSuffix;
	fFlags = src.fFlags;
}

plAgePage::~plAgePage()
{
	delete [] fName;
}

plAgePage &plAgePage::operator=( const plAgePage &src )
{
	delete [] fName;
	fName = src.fName != nil ? hsStrcpy( src.fName ) : nil;
	fSeqSuffix = src.fSeqSuffix;
	fFlags = src.fFlags;
	
	return *this;
}

void plAgePage::SetFlags(Byte f, bool on)
{
	if (on)
		hsSetBits(fFlags, f);
	else
		hsClearBits(fFlags, f);
}

// now preservs original string
hsBool	plAgePage::SetFromString( const char *stringIn )
{
	char	*c, seps[] = ", \n";
	std::string string = stringIn;

	// Parse. Format is going to be "pageName[,seqSuffix[,flags]]"
	c = strtok( (char*)string.c_str(), seps );
	if( c == nil )
		return false;

	delete [] fName;
	fName = hsStrcpy( c );

	// Look for seqSuffix
	c = strtok( nil, seps );
	if( c != nil )
	{
		fSeqSuffix = atoi( c );

		// Look for flags
		c = strtok( nil, seps );
		if( c != nil )
		{
			fFlags = atoi( c );
		}
		else
			fFlags = 0;
	}
	else
	{
		fSeqSuffix = kInvalidSeqSuffix;
		fFlags = 0;
	}

	return true;
}

char	*plAgePage::GetAsString( void ) const
{
	static char	str[ 256 ];


	// Format is "pageName[,seqSuffix[,flags]]"
	if( fFlags != 0 )
		sprintf( str, "%s,%d,%d", fName, fSeqSuffix, fFlags );
	else
		sprintf( str, "%s,%d", fName, fSeqSuffix );
	return str;
}


//
//  plAgeDescription
//
//
//

// static
char	plAgeDescription::kAgeDescPath[]={"dat"PATH_SEPARATOR_STR};
char	*plAgeDescription::fCommonPages[] = { "Textures", "BuiltIn" };

// Also gotta init the separators for our helper reading function
plAgeDescription::plAgeDescription() : plInitSectionTokenReader()
{
	IInit();
}


plAgeDescription::~plAgeDescription()
{
	IDeInit();
}

void plAgeDescription::IDeInit()
{
	ClearPageList();
	delete [] fName;	
}

plAgeDescription::plAgeDescription( const char *fileNameToReadFrom ) : plInitSectionTokenReader()
{
	ReadFromFile(fileNameToReadFrom);
}

//
// Reads from a file, returns false if failed.
//
bool plAgeDescription::ReadFromFile( const char *fileNameToReadFrom )
{
	IInit();

	hsStream* stream = plEncryptedStream::OpenEncryptedFile(fileNameToReadFrom);
	if( !stream )
		return false;

	Read( stream );
	stream->Close();
	delete stream;

	SetAgeNameFromPath( fileNameToReadFrom );
	return true;
}

void	plAgeDescription::SetAgeNameFromPath( const char *path )
{
	delete [] fName;

	if( path == nil )
	{
		fName = nil;
		return;
	}

	// Construct our name from the path
	const char *pathSep1 = strrchr( path, '\\' );
	const char *pathSep2 = strrchr( path, '/' );
	if( pathSep2 > pathSep1 )
		pathSep1 = pathSep2;
	if( pathSep1 == nil )
		pathSep1 = path;
	else
		pathSep1++;	// Get past the actual character we found

	char	temp[ 512 ];
	strcpy( temp, pathSep1 );
	char *end = strrchr( temp, '.' );
	if( end != nil )
		*end = 0;

	fName = hsStrcpy( temp );
}

void	plAgeDescription::IInit( void )
{
	fName = nil;
	fDayLength = 24.0f;
	fMaxCapacity = -1;
	fLingerTime = 180;	// seconds
	fSeqPrefix = 0;
	fReleaseVersion = 0;
	fStart.SetMode( plUnifiedTime::kLocal );

	fPageIterator = -1;
}

struct SzDelete {	void operator()(char * str) { delete [] str;} };
void plAgeDescription::ClearPageList()
{
	fPages.Reset();
}


void	plAgeDescription::AppendPage( const char *name, int seqSuffix, Byte flags )
{
	fPages.Append( plAgePage( name, ( seqSuffix == -1 ) ? fPages.GetCount() : (UInt32)seqSuffix, flags ) );
}

void	plAgeDescription::SeekFirstPage( void )
{
	fPageIterator = 0;
}

plAgePage	*plAgeDescription::GetNextPage( void )
{
	plAgePage	*ret = nil;


	if( fPageIterator >= 0 && fPageIterator < fPages.GetCount() )
	{
		ret = &fPages[ fPageIterator++ ];
		if( fPageIterator >= fPages.GetCount() )
			fPageIterator = -1;
	}

	return ret;
}

void	plAgeDescription::RemovePage( const char *page )
{
	int		i;

	for( i = 0; i < fPages.GetCount(); i++ )
	{
		if( strcmp( page, fPages[ i ].GetName() ) == 0 )
		{
			fPages.Remove( i );
			return;
		}
	}
}

plAgePage	*plAgeDescription::FindPage( const char *name ) const
{
	int		i;


	for( i = 0; i < fPages.GetCount(); i++ )
	{
		if( strcmp( name, fPages[ i ].GetName() ) == 0 )
			return &fPages[ i ];
	}

	return nil;
}

plLocation	plAgeDescription::CalcPageLocation( const char *page ) const
{
	plAgePage *ap = FindPage( page );
	if( ap != nil )
	{
		// Combine our sequence # together
		Int32 combined;
		hsAssert(abs(fSeqPrefix) < 0xFF, "Age sequence prefex is out of range!"); // sequence prefix can NOT be larger or equal to 1-byte max value
		UInt32 suffix = ap->GetSeqSuffix();
		hsAssert(suffix <= 0xFFFF, "Page sequence number is out of range!"); // page sequence number can NOT be larger then 2-byte max value
		if( fSeqPrefix < 0 ) // we are a global age
			combined = -(Int32)( ( ( -fSeqPrefix ) << 16 ) + suffix );
		else
			combined = ( fSeqPrefix << 16 ) + suffix;

		// Now, our 32 bit number looks like the following:
		// 0xRRAAPPPP
		// - RR is FF when reserved, and 00 when normal
		// - AA is the one byte for age sequence prefix (FF not allowed because 0xFFFFFFFFFF is reserved for invalid sequence number)
		// - PPPP is the two bytes for page sequence number

		if( IsGlobalAge() )
			return plLocation::MakeReserved( (UInt32)combined );
		else
		{
			plLocation ret = plLocation::MakeNormal( combined );
			if (page && !stricmp(page, "builtin"))
				ret.SetFlags(plLocation::kBuiltIn);
			return ret;
		}		
	}

	// Just make a blank (invalid) one
	plLocation	loc;
	return loc;
}

//
// Writes the Age Description File
//
void plAgeDescription::Write(hsStream* stream) const
{
	char buf[256];

	// Write the date/time
    sprintf(buf, "StartDateTime=%010lu\n", (unsigned long)fStart.GetSecs());
	stream->WriteString(buf);

	// Write the day length
	sprintf(buf, "DayLength=%f\n", fDayLength);
	stream->WriteString(buf);

	// Write the max capacity
	sprintf(buf, "MaxCapacity=%d\n", fMaxCapacity);
	stream->WriteString(buf);

	// Write the linger time
	sprintf(buf, "LingerTime=%d\n", fLingerTime);
	stream->WriteString(buf);

	// Write out the sequence prefix
	sprintf( buf, "SequencePrefix=%d\n", fSeqPrefix );
	stream->WriteString( buf );

	// Write out the release version
	sprintf( buf, "ReleaseVersion=%d\n", fReleaseVersion );
	stream->WriteString( buf );

	// Write out the pages
	int i;
	for( i = 0; i < fPages.GetCount(); i++ )
	{
		sprintf(buf, "Page=%s\n", fPages[ i ].GetAsString() );
		stream->WriteString(buf);
	}
}

// Somewhat of an overkill, but I created it, so I better use it.
// The really nifty (or scary, depending on your viewpoint) thing is that, since
// we only have one section, we can safely use ourselves as the section reader.
// Later I might just add section readers with function pointers to avoid this need entirely

const char	*plAgeDescription::GetSectionName( void ) const
{
	return "AgeInfo";
}

hsBool		plAgeDescription::IParseToken( const char *token, hsStringTokenizer *tokenizer, UInt32 userData )
{
	char *tok;

	if( !stricmp( token, "StartDateTime" ) )
	{
		if( ( tok = tokenizer->next() ) != nil )
		{
			char buf[11];
			strncpy(buf, tok, 10); buf[10] = '\0';
			fStart.SetSecs(atoi(buf));
		}
	}
	else if (!stricmp(token, "DayLength"))
	{
		if( ( tok = tokenizer->next() ) != nil )
			fDayLength = (float)atof(tok);
	}
	else if (!stricmp(token, "Page"))
	{
		fPages.Append( plAgePage( tokenizer->GetRestOfString() ) );
		if( fPages[ fPages.GetCount() - 1 ].GetSeqSuffix() == plAgePage::kInvalidSeqSuffix )
			fPages[ fPages.GetCount() - 1 ].SetSeqSuffix( fPages.GetCount() );
	}
	else if (!stricmp(token, "MaxCapacity"))
	{
		if( ( tok = tokenizer->next() ) != nil )
			fMaxCapacity = atoi(tok);
	}
	else if (!stricmp(token, "LingerTime"))
	{
		if( ( tok = tokenizer->next() ) != nil )
			fLingerTime = atoi(tok);
	}
	else if( !stricmp(token, "SequencePrefix"))
	{
		if( ( tok = tokenizer->next() ) != nil )
			fSeqPrefix = atoi(tok);
	}
	else if( !stricmp(token, "ReleaseVersion"))
	{
		if( ( tok = tokenizer->next() ) != nil )
			fReleaseVersion = atoi(tok);
	}

	return true;
}

//
// Reads the Age Description File
//
void plAgeDescription::Read(hsStream* stream)
{
	plInitSectionReader	*sections[] = { (plInitSectionReader *)this, nil };

	plInitFileReader	reader( stream, sections );

	if( !reader.IsOpen() )
	{
		hsAssert( false, "Unable to open age description file for reading" );
		return;
	}
	
	reader.Parse();
	reader.Close();
}

//
// What is the current time in the age (in secs), based on dayLength.
//
int plAgeDescription::GetAgeTimeOfDaySecs(const plUnifiedTime& earthCurrentTime) const
{
	double elapsedSecs = GetAgeElapsedSeconds(earthCurrentTime);
	int secsInADay = (int)(fDayLength * 60 * 60);
	int ageTime = (int)elapsedSecs % secsInADay;
	return ageTime;
}

//
// What is the current time in the age (from 0-1), based on dayLength.
//
float plAgeDescription::GetAgeTimeOfDayPercent(const plUnifiedTime& earthCurrentTime) const
{
	double elapsedSecs = GetAgeElapsedSeconds(earthCurrentTime);
	int secsInADay = (int)(fDayLength * 60 * 60);
	double ageTime = fmod(elapsedSecs, secsInADay);
	float percent=(float)(ageTime/secsInADay);
	if (percent<0.f)
		percent=0.f;
	if (percent>1.f)
		percent=1.f;
	return percent;
}

//
// How old is the age in days.
//
double plAgeDescription::GetAgeElapsedDays(plUnifiedTime earthCurrentTime) const
{
	earthCurrentTime.SetMicros(0);  // Ignore micros for this calculation

	double elapsedSecs = GetAgeElapsedSeconds(earthCurrentTime);
	return elapsedSecs / 60.0 / 60.0 / fDayLength;  // days and fractions
}

//
// How many seconds have elapsed since the age was born.  or how old is the age (in secs)
//
double plAgeDescription::GetAgeElapsedSeconds(const plUnifiedTime & earthCurrentTime) const
{
	plUnifiedTime elapsed = earthCurrentTime - fStart;
	return elapsed.GetSecsDouble();
}

	// Static functions for the available common pages
	enum CommonPages
	{
		kTextures,
		kGlobal
	};

const char *plAgeDescription::GetCommonPage( int pageType )
{
	hsAssert( pageType < kNumCommonPages, "Invalid page type in GetCommonPage()" );
	return fCommonPages[ pageType ];
}

void	plAgeDescription::AppendCommonPages( void )
{
	UInt32 startSuffix = 0xffff, i;


	if( IsGlobalAge() )
		return;

	for( i = 0; i < kNumCommonPages; i++ )
		fPages.Append( plAgePage( fCommonPages[ i ], startSuffix - i, 0 ) );
}

void	plAgeDescription::CopyFrom(const plAgeDescription& other)
{
	IDeInit();
	fName = hsStrcpy(other.GetAgeName());
	int i;
	for(i=0;i<other.fPages.GetCount(); i++)
		fPages.Append( other.fPages[ i ] );

	fStart = other.fStart;
	fDayLength = other.fDayLength;
	fMaxCapacity = other.fMaxCapacity;
	fLingerTime = other.fLingerTime;

	fSeqPrefix = other.fSeqPrefix;
	fReleaseVersion = other.fReleaseVersion;
}

bool plAgeDescription::FindLocation(const plLocation& loc) const
{
	int i;
	for( i = 0; i < fPages.GetCount(); i++ )
	{
		plLocation pageLoc = CalcPageLocation(fPages[i].GetName());
		if (pageLoc == loc)
			return true;
	}
	return false;
}