/*  Copyright (c) MediaArea.net SARL. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license that can
 *  be found in the License.html file in the root of the source tree.
 */

//---------------------------------------------------------------------------
// Pre-compilation
#include "MediaInfo/PreComp.h"
#ifdef __BORLANDC__
    #pragma hdrstop
#endif
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
#include "MediaInfo/Setup.h"
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
#include "MediaInfo/Tag/File__Tags.h"
#if defined(MEDIAINFO_APETAG_YES)
    #include "MediaInfo/Tag/File_ApeTag.h"
#endif //MEDIAINFO_APETAG_YES
#if defined(MEDIAINFO_ID3_YES)
    #include "MediaInfo/Tag/File_Id3.h"
#endif //MEDIAINFO_ID3_YES
#if defined(MEDIAINFO_ID3V2_YES)
    #include "MediaInfo/Tag/File_Id3v2.h"
#endif //MEDIAINFO_ID3V2_YES
#if defined(MEDIAINFO_LYRICS3_YES)
    #include "MediaInfo/Tag/File_Lyrics3.h"
#endif //MEDIAINFO_LYRICS3_YES
#if defined(MEDIAINFO_LYRICS3V2_YES)
    #include "MediaInfo/Tag/File_Lyrics3v2.h"
#endif //MEDIAINFO_LYRICS3V2_YES
    #include "MediaInfo/File_Unknown.h"
//---------------------------------------------------------------------------

namespace MediaInfoLib
{

//***************************************************************************
// Constructor/Destructor
//***************************************************************************

//---------------------------------------------------------------------------
File__Tags_Helper::File__Tags_Helper()
{
    //In
    Base=NULL;

    //Out
    TagsSize=0;
    File_BeginTagSize=0;
    File_EndTagSize=0;

    //Temp
    Parser=NULL;
    Id3v1_Offset=(int64u)-1;
    Lyrics3_Offset=(int64u)-1;
    Lyrics3v2_Offset=(int64u)-1;
    ApeTag_Offset=(int64u)-1;
    JumpTo_WantedByParser=(int64u)-1;
    Id3v1_Size=0;
    Lyrics3_Size=0;
    Lyrics3v2_Size=0;
    ApeTag_Size=0;
    TagSizeIsFinal=false;
    SearchingForEndTags=false;
}

//---------------------------------------------------------------------------
File__Tags_Helper::~File__Tags_Helper()
{
    delete Parser; //Parser=NULL;
    for (size_t Pos=0; Pos<Parser_Streams_Fill.size(); Pos++)
        delete Parser_Streams_Fill[Pos]; //Parser_Streams_Fill[Pos]=NULL;
}

//***************************************************************************
// Streams management
//***************************************************************************

//---------------------------------------------------------------------------
void File__Tags_Helper::Streams_Fill()
{
    for (size_t Pos=0; Pos<Parser_Streams_Fill.size(); Pos++)
    {
        if (Parser_Streams_Fill[Pos] && Parser_Streams_Fill[Pos]->Status[File__Analyze::IsAccepted])
        {
            #ifndef MEDIAINFO_ID3V2_YES
                const bool Priority=false;
            #else
                bool Priority=Parser_Streams_Fill_Priority[Pos];
            #endif

            Parser_Streams_Fill[Pos]->Read_Buffer_Finalize();
            Base->Merge(*(Parser_Streams_Fill[Pos]), Stream_General, 0, 0, Priority);
            Base->Merge(*(Parser_Streams_Fill[Pos]), Stream_Audio  , 0, 0, Priority);
        }
        delete Parser_Streams_Fill[Pos]; //Parser_Streams_Fill[Pos]=NULL;
    }
    Parser_Streams_Fill.clear();
}

//---------------------------------------------------------------------------
void File__Tags_Helper::Streams_Finish()
{
    if (!Base->IsSub)
    {
        Base->Fill(Stream_General, 0, General_StreamSize, TagsSize+Base->Retrieve(Stream_General, 0, General_StreamSize).To_int64u(), 10, true);
        if (Base->Retrieve(Stream_Audio, 0, Audio_StreamSize).empty())
            Base->Fill(Stream_Audio, 0, Audio_StreamSize, Base->File_Size-TagsSize);
    }
}

//***************************************************************************
// Buffer - Global
//***************************************************************************

//---------------------------------------------------------------------------
bool File__Tags_Helper::Read_Buffer_Continue()
{
    //Tags
    bool Tag_Found;
    if (File__Tags_Helper::Synchronize(Tag_Found) &&  Tag_Found)
        File__Tags_Helper::Synched_Test();
    return true;
}

//***************************************************************************
// Buffer - Synchro
//***************************************************************************

//---------------------------------------------------------------------------
bool File__Tags_Helper::Synchronize(bool &Tag_Found, size_t Synchro_Offset)
{
    //Buffer size
    if (Parser)
    {
        Synched_Test();
        if (Parser)
            return false;
    }

    if (SearchingForEndTags)
    {
        GoTo(0, "Tags detected");
        return false;
    }

    if (!Synchro_Offset)
    {
        if (!Synched_Test()) //Handling begin/intermediate Id3v2
            return false;
    }

    //ID
    if (Base->Buffer_Offset+Synchro_Offset+8>Base->Buffer_Size)
        return false;
    int32u ID3=CC3(Base->Buffer+Base->Buffer_Offset+Synchro_Offset);
    int64u ID8=CC8(Base->Buffer+Base->Buffer_Offset+Synchro_Offset);
    if (ID3==0x494433 //"ID3"
     || ID8==0x4150455441474558LL //"APETAGEX"
     || ID8==0x4C59524943534245LL //"LYRICSBE"
     || ID3==0x544147) //"TAG" / "TAG+"
        Tag_Found=true;
    else
        Tag_Found=false;

    return true;
}

//---------------------------------------------------------------------------
bool File__Tags_Helper::Synched_Test()
{
    if (SearchingForEndTags)
        return true;

    for (;;)
    {
        #ifdef MEDIAINFO_ID3V2_YES
            bool Priority=false;
        #else
            const bool Priority=false;
        #endif

        if (!Parser)
        {
            //Must have enough buffer for having header
            if (Base->Buffer_Offset+8>Base->Buffer_Size)
                return Base->IsSub; //If IsSub, we consider this is a complete block

            //Quick test of synchro
            int32u ID=CC3(Base->Buffer+Base->Buffer_Offset);
            int32u ID4=CC4(Base->Buffer+Base->Buffer_Offset);
            int64u ID8=CC8(Base->Buffer+Base->Buffer_Offset);
                 if (ID==0x494433 || ID==0x656133) //"ID3" and "ea3" (found in OpenMG)
            {
                if (Base->Buffer_Offset+10>Base->Buffer_Size)
                    return false;
                int32u Size=BigEndian2int32u(Base->Buffer+Base->Buffer_Offset+6);
                Parser_Buffer_Size=(((Size>>0)&0x7F)
                                  | ((Size>>1)&0x3F80)
                                  | ((Size>>2)&0x1FC000)
                                  | ((Size>>3)&0x0FE00000))
                                  +10;
                if (Base->Buffer_Offset+Parser_Buffer_Size>Base->Buffer_Size)
                    return false;
                if (!TagSizeIsFinal)
                    File_BeginTagSize+=Parser_Buffer_Size;
                if (Base->File_Offset_FirstSynched==(int64u)-1)
                    Base->Buffer_TotalBytes_FirstSynched_Max+=Parser_Buffer_Size;
                #ifdef MEDIAINFO_ID3V2_YES
                    Parser=new File_Id3v2;
                    Priority=true;
                #else
                    Parser=new File_Unknown;
                #endif
                Base->Element_Begin1("Id3v2");
            }
            else if (ID8==0x4150455441474558LL) //"APETAGEX"
            {
                if (Base->Buffer_Offset+16>Base->Buffer_Size)
                    return false;
                Parser_Buffer_Size=LittleEndian2int32u(Base->Buffer+Base->Buffer_Offset+12);
                if (LittleEndian2int32u(Base->Buffer+Base->Buffer_Offset+8))
                    Parser_Buffer_Size+=32;
                if (Base->Buffer_Offset+Parser_Buffer_Size>Base->Buffer_Size)
                    return false;
                if (!TagSizeIsFinal)
                    File_BeginTagSize+=Parser_Buffer_Size;
                if (Base->File_Offset_FirstSynched==(int64u)-1)
                    Base->Buffer_TotalBytes_FirstSynched_Max+=Parser_Buffer_Size;
                #ifdef MEDIAINFO_APETAG_YES
                    Parser=new File_ApeTag;
                #else
                    Parser=new File_Unknown;
                #endif
                Base->Element_Begin1("ApeTag");
            }
            else if (ID8==0x4C59524943534245LL) //"LYRICSBE"
            {
                if (Base->Buffer_Offset+16>Base->Buffer_Size)
                    return false;
                //Searching for "LYRICS200"
                std::string Buf((const char*)(Base->Buffer+Base->Buffer_Offset), Base->Buffer_Size-Base->Buffer_Offset);
                size_t Pos2=Buf.find("LYRICS200");
                size_t Pos1=std::string::npos;
                if (Pos2==std::string::npos)
                    Pos1=Buf.find("LYRICSEND");
                if (Pos2!=std::string::npos)
                    Parser_Buffer_Size=Pos2+9;
                else if (Pos1!=std::string::npos)
                    Parser_Buffer_Size=Pos1+9;
                else
                    Parser_Buffer_Size=(size_t)(Base->File_Size-(Base->File_Offset+Base->Buffer_Offset));
                if (Base->Buffer_Offset+Parser_Buffer_Size>Base->Buffer_Size)
                    return false;
                if (!TagSizeIsFinal)
                    File_BeginTagSize+=Parser_Buffer_Size;
                if (Base->File_Offset_FirstSynched==(int64u)-1)
                    Base->Buffer_TotalBytes_FirstSynched_Max+=Parser_Buffer_Size;
                if (Pos2!=std::string::npos)
                {
                    #ifdef MEDIAINFO_LYRICS3V2_YES
                        Parser=new File_Lyrics3v2;
                        ((File_Lyrics3v2*)Parser)->TotalSize=Parser_Buffer_Size;
                    #else
                        Parser=new File_Unknown;
                    #endif
                    Base->Element_Begin1("Lyrics2");
                }
                else if (Pos1!=std::string::npos)
                {
                    #ifdef MEDIAINFO_LYRICS3_YES
                        Parser=new File_Lyrics3;
                        ((File_Lyrics3*)Parser)->TotalSize=Parser_Buffer_Size;
                    #else
                        Parser=new File_Unknown;
                    #endif
                    Base->Element_Begin1("Lyrics");
                }
                else
                {
                    Parser=new File_Unknown;
                    Base->Element_Begin1("Problem");
                }
            }
            else if (ID4==0x5441472B) //"TAG+"
            {
                #ifdef MEDIAINFO_ID3_YES
                    Parser=new File_Id3;
                #else
                    Parser=new File_Unknown;
                #endif
                Parser_Buffer_Size=227+128;
                Base->Element_Begin1("Id3+");
            }
            else if (ID==0x544147) //"TAG"
            {
                #ifdef MEDIAINFO_ID3_YES
                    Parser=new File_Id3;
                #else
                    Parser=new File_Unknown;
                #endif
                Parser_Buffer_Size=128;
                if (!TagSizeIsFinal)
                    File_BeginTagSize+=Parser_Buffer_Size;
                Base->Element_Begin1("Id3");
            }
            else if (Base->File_Offset+Base->Buffer_Offset==Lyrics3_Offset)
            {
                #ifdef MEDIAINFO_LYRICS3_YES
                    Parser=new File_Lyrics3;
                    ((File_Lyrics3*)Parser)->TotalSize=Lyrics3_Size;
                #else
                    Parser=new File__Analyze;
                #endif
                Parser_Buffer_Size=(size_t)Lyrics3_Size;
                if (!TagSizeIsFinal)
                    File_BeginTagSize+=Parser_Buffer_Size;
                Base->Element_Begin1("Lyrics3");
            }
            else if (Base->File_Offset+Base->Buffer_Offset==Lyrics3v2_Offset)
            {
                #ifdef MEDIAINFO_LYRICS3V2_YES
                    Parser=new File_Lyrics3v2;
                    ((File_Lyrics3v2*)Parser)->TotalSize=Lyrics3v2_Size;
                #else
                    Parser=new File_Unknown;
                #endif
                Parser_Buffer_Size=(size_t)Lyrics3v2_Size;
                if (!TagSizeIsFinal)
                    File_BeginTagSize+=Parser_Buffer_Size;
                Base->Element_Begin1("Lyrics3v2");
            }
            else if (Base->File_Offset+Base->Buffer_Offset==ApeTag_Offset)
            {
                #ifdef MEDIAINFO_APETAG_YES
                    Parser=new File_ApeTag;
                #else
                    Parser=new File_Unknown;
                #endif
                if (!TagSizeIsFinal)
                    File_BeginTagSize+=Parser_Buffer_Size;
                Parser_Buffer_Size=(size_t)ApeTag_Size;
                Base->Element_Begin1("ApeTag");
            }
            else
                break;
            Base->Open_Buffer_Init(Parser);
        }

        //We continue
        if (Parser)
        {
            if (!Parser_Buffer_Size)
            {
                delete Parser; Parser=NULL;
                return false; //Probably stuck in a loop, exit
            }
            int64u Size_ToParse=(Parser_Buffer_Size<Base->Buffer_Size-Base->Buffer_Offset)?Parser_Buffer_Size:(Base->Buffer_Size-Base->Buffer_Offset);
            Base->Open_Buffer_Continue(Parser, Base->Buffer+Base->Buffer_Offset, (size_t)Size_ToParse);
            Base->Buffer_Offset+=(size_t)Size_ToParse;
            TagsSize+=Size_ToParse;
            Parser_Buffer_Size-=(size_t)Size_ToParse;
            if (Parser->Status[File__Analyze::IsFinished] || Parser_Buffer_Size==0)
            {
                if (Base->Status[File__Analyze::IsAccepted] && Parser->Count_Get(Stream_General)>0)
                {
                    if (!Base->Status[File__Analyze::IsFilled])
                        Base->Fill();
                    Parser->Read_Buffer_Finalize();
                    Base->Merge(*Parser, Stream_General, 0, 0, Priority);
                    Base->Merge(*Parser, Stream_Audio  , 0, 0, Priority);
                    delete Parser; Parser=NULL;
                }
                else
                {
                    Parser_Streams_Fill.push_back(Parser);
                    #ifdef MEDIAINFO_ID3V2_YES
                        Parser_Streams_Fill_Priority.push_back(Priority);
                    #endif
                    Parser=NULL;
                }
                if (Parser_Buffer_Size)
                    Base->Skip_XX(Parser_Buffer_Size,           "Data continued");
                Base->Element_Show();
                Base->Element_End0();
            }
            else
                break;
        }
    }

    return true;
}

//***************************************************************************
// Streams
//***************************************************************************

//---------------------------------------------------------------------------
size_t File__Tags_Helper::Stream_Prepare(stream_t StreamKind)
{
    if (Base->Count_Get(StreamKind))
        return 1; //Only one is permited
    return Base->Stream_Prepare(StreamKind);
}

//***************************************************************************
// End
//***************************************************************************

//---------------------------------------------------------------------------
void File__Tags_Helper::GoTo (int64u GoTo, const char* ParserName)
{
    if (Base->IsSub)
    {
        Base->GoTo(GoTo, ParserName);
        return;
    }

    //Normal Data_GoTo;

    //Configuring
    if (!SearchingForEndTags)
    {
        if (GoTo==(int64u)-1)
            JumpTo_WantedByParser=Base->File_Offset+Base->Buffer_Offset;
        else
            JumpTo_WantedByParser=GoTo;
        SearchingForEndTags=true;
    }

    //Trying to parse tags
    while (!TagSizeIsFinal && DetectBeginOfEndTags_Test());

    //If a jump is requested
    if (!TagSizeIsFinal)
        return;

    //Positionning (if finnished)
    if (TagSizeIsFinal)
    {
        if (JumpTo_WantedByParser!=(int64u)-1)
        {
            if (JumpTo_WantedByParser<Id3v1_Size+Lyrics3_Size+Lyrics3v2_Size+ApeTag_Size)
                Base->GoTo(JumpTo_WantedByParser, ParserName);
            else
                Base->GoTo(JumpTo_WantedByParser-Id3v1_Size-Lyrics3_Size-Lyrics3v2_Size-ApeTag_Size, ParserName);
        }
        SearchingForEndTags=false;
    }
    else
        Base->GoTo(GoTo, ParserName);
}

//---------------------------------------------------------------------------
void File__Tags_Helper::GoToFromEnd (int64u GoToFromEnd, const char* ParserName)
{
    if (GoToFromEnd>Base->File_Size)
    {
        if (ParserName)
        {
            bool MustElementBegin=Base->Element_Level?true:false;
            if (Base->Element_Level>0)
                Base->Element_End0(); //Element
            Base->Info(Ztring(ParserName)+__T(", wants to go to somewhere, but not valid"));
            if (MustElementBegin)
                Base->Element_Level++;
        }
        Finish(ParserName);
        return;
    }

    GoTo(Base->File_Size-GoToFromEnd, ParserName);
}

//---------------------------------------------------------------------------
void File__Tags_Helper::Accept (const char* ParserName)
{
    Base->Accept(ParserName);
}

//---------------------------------------------------------------------------
void File__Tags_Helper::Reject (const char* ParserName)
{
    Base->Reject(ParserName);
}

//---------------------------------------------------------------------------
void File__Tags_Helper::Finish (const char* ParserName)
{
    if (ParserName)
    {
        bool MustElementBegin=Base->Element_Level?true:false;
        if (Base->Element_Level>0)
            Base->Element_End0(); //Element
        Base->Info(Ztring(ParserName)+__T(", finished but searching tags"));
        if (MustElementBegin)
            Base->Element_Level++;
    }

    GoToFromEnd(0, ParserName);
}

//---------------------------------------------------------------------------
bool File__Tags_Helper::DetectBeginOfEndTags_Test()
{
        TagSizeIsFinal=true;

        //Id3v1
        if (Id3v1_Size==0 && File_EndTagSize==0 && Base->File_Size>=128) //Only one, at the end, larger than 128 bytes
        {
            if (Base->File_Offset>Base->File_Size-128-32) //Must be at least at the end less 128 bytes
            {
                Base->GoTo(Base->File_Size-128-32, "Tags detection"); //32 to be able to quickly see another tag system
                TagSizeIsFinal=false;
                return false;
            }

            if (Base->File_Offset+Base->Buffer_Size<Base->File_Size) //Must be at least at the end less 128 bytes of tags
            {
                if (Base->File_Offset<Base->File_Size-128-32)
                    Base->GoTo(Base->File_Size-128-32, "Tags detection");
                TagSizeIsFinal=false;
                return false;
            }

            if (CC3(Base->Buffer+((size_t)((Base->File_Size-128)-Base->File_Offset)))==CC3("TAG"))
            {
                Id3v1_Size=128;
                File_EndTagSize+=128;
                Id3v1_Offset=Base->File_Size-File_EndTagSize;
                TagSizeIsFinal=false;
            }
        }

        //Lyrics3
        if (Lyrics3_Size==0 && Base->File_Size>=File_EndTagSize+9) //Only one, larger than File_EndTagSize+15 bytes
        {
            if (Base->File_Offset>Base->File_Size-File_EndTagSize-9) //Must be at the end less 15 bytes
            {
                Base->GoTo(Base->File_Size-File_EndTagSize-9, "Tags");
                TagSizeIsFinal=false;
                return false;
            }

            if (Base->File_Offset+Base->Buffer_Size<Base->File_Size-File_EndTagSize) //Must be at the end less File_EndTagSize+9 bytes plus 9 bytes of tags
            {
                if (Base->File_Offset!=Base->File_Size-File_EndTagSize)
                    Base->GoTo(Base->File_Size-File_EndTagSize, "Tags");
                TagSizeIsFinal=false;
                return false;
            }

            if (CC8(Base->Buffer+((size_t)((Base->File_Size-File_EndTagSize-9)-Base->File_Offset)))==CC8("LYRICSEN"))
            {
                //Must find the beginning, 5100 bytes before
                if (Base->File_Offset>Base->File_Size-File_EndTagSize-5100) //Must be at the end less 15 bytes
                {
                    Base->GoTo(Base->File_Size-File_EndTagSize-5100, "Tags");
                    TagSizeIsFinal=false;
                    return false;
                }

                if (Base->File_Offset+Base->Buffer_Size<Base->File_Size-File_EndTagSize) //Must be at the end less File_EndTagSize
                {
                    if (Base->File_Offset!=Base->File_Size-File_EndTagSize)
                        Base->GoTo(Base->File_Size-File_EndTagSize, "Tags");
                    TagSizeIsFinal=false;
                    return false;
                }

                //Searching for "LYRICSBEGIN"
                std::string Buf((const char*)(Base->Buffer+Base->Buffer_Offset), Base->Buffer_Size-Base->Buffer_Offset);
                size_t Pos=Buf.find("LYRICSBEGIN");
                if (Pos!=std::string::npos)
                {
                    Lyrics3_Size=Base->File_Size-File_EndTagSize-(Base->File_Offset+Base->Buffer_Offset+Pos);
                    File_EndTagSize+=Lyrics3_Size;
                    Lyrics3_Offset=Base->File_Size-File_EndTagSize;
                    TagSizeIsFinal=false;
                }
            }
        }

        //Lyrics3v2
        if (Lyrics3v2_Size==0 && Base->File_Size>=File_EndTagSize+15) //Only one, larger than File_EndTagSize+15 bytes
        {
            if (Base->File_Offset>Base->File_Size-File_EndTagSize-15) //Must be at the end less 15 bytes
            {
                Base->GoTo(Base->File_Size-File_EndTagSize-15, "Tags");
                TagSizeIsFinal=false;
                return false;
            }

            if (Base->File_Offset+Base->Buffer_Size<Base->File_Size-File_EndTagSize) //Must be at the end less File_EndTagSize
            {
                if (Base->File_Offset!=Base->File_Size-File_EndTagSize)
                    Base->GoTo(Base->File_Size-File_EndTagSize, "Tags");
                TagSizeIsFinal=false;
                return false;
            }

            if (CC8(Base->Buffer+((size_t)((Base->File_Size-File_EndTagSize-15+6)-Base->File_Offset)))==CC8("LYRICS20"))
            {
                Lyrics3v2_Size=Ztring((const char*)(Base->Buffer+((size_t)((Base->File_Size-File_EndTagSize-15)-Base->File_Offset))), 6).To_int32u()+15;
                File_EndTagSize+=Lyrics3v2_Size;
                Lyrics3v2_Offset=Base->File_Size-File_EndTagSize;
                TagSizeIsFinal=false;
            }
        }

        //ApeTag
        if (ApeTag_Size==0 && Base->File_Size>=File_EndTagSize+32) //Only one, larger than File_EndTagSize+32 bytes
        {
            if (Base->File_Offset>Base->File_Size-File_EndTagSize-32) //Must be at the end less 32 bytes
            {
                Base->GoTo(Base->File_Size-File_EndTagSize-32, "Tags");
                TagSizeIsFinal=false;
                return false;
            }

            if (Base->File_Offset+Base->Buffer_Size<Base->File_Size-File_EndTagSize) //Must be at the end less File_EndTagSize+15 bytes plus 15 bytes of tags
            {
                if (Base->File_Offset!=Base->File_Size-File_EndTagSize-32)
                    Base->GoTo(Base->File_Size-File_EndTagSize-32, "Tags");
                TagSizeIsFinal=false;
                return false;
            }

            if (CC8(Base->Buffer+((size_t)((Base->File_Size-File_EndTagSize-32)-Base->File_Offset)))==CC8("APETAGEX"))
            {
                ApeTag_Size=LittleEndian2int32u(Base->Buffer+((size_t)((Base->File_Size-File_EndTagSize-32+12)-Base->File_Offset)));
                if (LittleEndian2int32u(Base->Buffer+((size_t)((Base->File_Size-File_EndTagSize-32+8)-Base->File_Offset)))==2000)
                    ApeTag_Size+=32;
                File_EndTagSize+=ApeTag_Size;
                ApeTag_Offset=Base->File_Size-File_EndTagSize;
                TagSizeIsFinal=false;
            }
        }

        //Finished
        return true;
}

//***************************************************************************
// C++
//***************************************************************************

} //NameSpace

