/*

 * MP3/MPlayer plugin to VDR (C++)

 *

 * (C) 2001-2009 Stefan Huelswitt <s.huelswitt@gmx.de>

 *

 * This code 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 2

 * of the License, or (at your option) any later version.

 *

 * This code 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html

 */

#include <stdlib.h>

#include <stdio.h>

#include <errno.h>

#include <sys/stat.h>

#include <sys/vfs.h>

#include <vdr/videodir.h>

#include "common.h"

#include "data-mp3.h"

#include "data-src.h"

#include "decoder.h"

#include "decoder-core.h"

#include "decoder-mp3.h"

#include "decoder-mp3-stream.h"

#include "decoder-snd.h"

#include "decoder-ogg.h"

#include "decoder-ogg-stream.h"

#define CACHEFILENAME     "id3info.cache"

#define CACHESAVETIMEOUT  120 // secs

#define CACHEPURGETIMEOUT 120 // days

extern cFileSources MP3Sources;

cInfoCache InfoCache;

char *cachedir=0;

int MakeHashBuff(const char *buff, int len)

{

  int h=len;

  while(len--) h=(h*13 + *buff++) & 0x7ff;

  return h;

}

// --- cStrConv ----------------------------------------------------------------

class cStrConv : private cMutex {

private:

  cCharSetConv toSys;

public:

  cStrConv(void):toSys("UTF-8",cCharSetConv::SystemCharacterTable()) {}

  char *ToSys(char *from);

  };

static cStrConv *strconv;

char *cStrConv::ToSys(char *from)

{

  if(from) {

    Lock();

    const char *r=toSys.Convert(from);

    Unlock();

    if(r!=from) {

      char *n=strdup(r);

      if(n) {

        free(from);

        return n;

        }

      }

    }

  return from;

}

// --- cSongInfo ---------------------------------------------------------------

cSongInfo::cSongInfo(void)

{

  Title=Artist=Album=0;

  Clear();

}

cSongInfo::~cSongInfo()

{

  Clear();

}

void cSongInfo::Clear(void)

{

  Frames=0; Total=-1; DecoderID=0;

  SampleFreq=Channels=Bitrate=MaxBitrate=ChMode=-1;

  free(Title); Title=0;

  free(Artist); Artist=0;

  free(Album); Album=0;

  Year=-1;

  Level=Peak=0.0;

  infoDone=false; utf8clean=true;

}

void cSongInfo::Set(cSongInfo *si, bool update)

{

  if(!update || si->Utf8Clean()) {

    Clear();

    Title=si->Title ? strdup(si->Title):0;

    Artist=si->Artist ? strdup(si->Artist):0;

    Album=si->Album ? strdup(si->Album):0;

    utf8clean=si->utf8clean;

    }

  Frames=si->Frames;

  Total=si->Total;

  SampleFreq=si->SampleFreq;

  Channels=si->Channels;

  Bitrate=si->Bitrate;

  MaxBitrate=si->MaxBitrate;

  ChMode=si->ChMode;

  Year=si->Year;

  if(si->Level>0.0) { // preserve old level

    Level=si->Level;

    Peak=si->Peak;

    }

  DecoderID=si->DecoderID;

  InfoDone();

}

void cSongInfo::FakeTitle(const char *filename, const char *extention)

{

  // if no title, try to build a reasonable from the filename

  if(!Title && filename)  {

    const char *s=rindex(filename,'/');

    if(s && *s=='/') {

      s++;

      Title=strdup(s);

      strreplace(Title,'_',' ');

      if(extention) {                            // strip given extention

        int l=strlen(Title)-strlen(extention);

        if(l>0 && !strcasecmp(Title+l,extention)) Title[l]=0;

        }

      else {                                     // strip any extention

        char *e=rindex(Title,'.');

        if(e && *e=='.' && strlen(e)<=5) *e=0;

        }

      d(printf("mp3: faking title '%s' from filename '%s'\n",Title,filename))

      }

    }

}

void cSongInfo::ConvertToSys(void)

{

  if(cCharSetConv::SystemCharacterTable()) {

    Title=strconv->ToSys(Title);

    Artist=strconv->ToSys(Artist);

    Album=strconv->ToSys(Album);

    utf8clean=false;

    }

}

// --- cFileInfo ---------------------------------------------------------------

cFileInfo::cFileInfo(void)

{

  Filename=FsID=0; Clear();

}

cFileInfo::cFileInfo(const char *Name)

{

  Filename=FsID=0; Clear();

  Filename=strdup(Name);

}

cFileInfo::~cFileInfo()

{

  Clear();

}

void cFileInfo::Clear(void)

{

  free(Filename); Filename=0;

  free(FsID); FsID=0;

  Filesize=0; CTime=0; FsType=0; removable=-1;

  infoDone=false;

}

bool cFileInfo::Removable(void)

{

  if(removable<0 && Filename) {

    cFileSource *src=MP3Sources.FindSource(Filename);

    if(src) removable=src->NeedsMount();

    else removable=1;

    }

  return (removable!=0);

}

void cFileInfo::Set(cFileInfo *fi)

{

  Clear(); InfoDone();

  Filename=fi->Filename ? strdup(fi->Filename):0;

  FsID=fi->FsID ? strdup(fi->FsID):0;

  Filesize=fi->Filesize;

  CTime=fi->CTime;

}

bool cFileInfo::FileInfo(bool log)

{

  if(Filename) {

    struct stat64 ds;

    if(!stat64(Filename,&ds)) {

      if(S_ISREG(ds.st_mode)) {

        free(FsID); FsID=0;

        FsType=0;

        struct statfs64 sfs;

        if(!statfs64(Filename,&sfs)) {

          if(Removable()) FsID=aprintf("%llx:%llx",sfs.f_blocks,sfs.f_files);

          FsType=sfs.f_type;

          }

        else if(errno!=ENOSYS && log) { esyslog("ERROR: can't statfs %s: %s",Filename,strerror(errno)); }

        Filesize=ds.st_size;

        CTime=ds.st_ctime;

#ifdef CDFS_MAGIC

        if(FsType==CDFS_MAGIC) CTime=0; // CDFS returns mount time as ctime

#endif

        InfoDone();

        return true;

        }

      else if(log) { esyslog("ERROR: %s is not a regular file",Filename); }

      }

    else if(log) { esyslog("ERROR: can't stat %s: %s",Filename,strerror(errno)); }

    }

  return false;

}

// --- cDecoders ---------------------------------------------------------------

cDecoder *cDecoders::FindDecoder(cFileObj *Obj)

{

  const char *full=Obj->FullPath();

  cFileInfo fi(full);

  cCacheData *dat;

  cDecoder *decoder=0;

  if(fi.FileInfo(false) && (dat=InfoCache.Search(&fi))) {

    if(dat->DecoderID) {

      //d(printf("mp3: found DecoderID '%s' for %s from cache\n",cDecoders::ID2Str(dat->DecoderID),Filename))

      switch(dat->DecoderID) {

        case DEC_MP3:  decoder=new cMP3Decoder(full); break;

        case DEC_MP3S: decoder=new cMP3StreamDecoder(full); break;

#ifdef HAVE_SNDFILE

        case DEC_SND:  decoder=new cSndDecoder(full); break;

#endif

#ifdef HAVE_VORBISFILE

        case DEC_OGG:  decoder=new cOggDecoder(full); break;

        case DEC_OGGS: decoder=new cOggStreamDecoder(full); break;

#endif

        default:       esyslog("ERROR: bad DecoderID '%s' from info cache: %s",cDecoders::ID2Str(dat->DecoderID),full); break;

        }

      }

    dat->Unlock();

    }

  if(!decoder || !decoder->Valid()) {

    // no decoder in cache or cached decoder doesn't matches.

    // try to detect a decoder

    delete decoder; decoder=0;

#ifdef HAVE_SNDFILE

    if(!decoder) {

      decoder=new cSndDecoder(full);

      if(!decoder || !decoder->Valid()) { delete decoder; decoder=0; }

      }

#endif

#ifdef HAVE_VORBISFILE

    if(!decoder) {

      decoder=new cOggDecoder(full);

      if(!decoder || !decoder->Valid()) { delete decoder; decoder=0; }

      }

    if(!decoder) {

      decoder=new cOggStreamDecoder(full);

      if(!decoder || !decoder->Valid()) { delete decoder; decoder=0; }

      }

#endif

    if(!decoder) {

      decoder=new cMP3StreamDecoder(full);

      if(!decoder || !decoder->Valid()) { delete decoder; decoder=0; }

      }

    if(!decoder) {

      decoder=new cMP3Decoder(full);

      if(!decoder || !decoder->Valid()) { delete decoder; decoder=0; }

      }

    if(!decoder) esyslog("ERROR: no decoder found for %s",Obj->Name());

    }

  return decoder;

}

const char *cDecoders::ID2Str(int id)

{

  switch(id) {

    case DEC_MP3:  return DEC_MP3_STR;

    case DEC_MP3S: return DEC_MP3S_STR;

    case DEC_SND:  return DEC_SND_STR;

    case DEC_OGG:  return DEC_OGG_STR;

    case DEC_OGGS: return DEC_OGGS_STR;

    }

  return 0;

}

int cDecoders::Str2ID(const char *str)

{

  if     (!strcmp(str,DEC_MP3_STR )) return DEC_MP3;

  else if(!strcmp(str,DEC_MP3S_STR)) return DEC_MP3S;

  else if(!strcmp(str,DEC_SND_STR )) return DEC_SND;

  else if(!strcmp(str,DEC_OGG_STR )) return DEC_OGG;

  else if(!strcmp(str,DEC_OGGS_STR)) return DEC_OGGS;

  return 0;

}

// --- cDecoder ----------------------------------------------------------------

cDecoder::cDecoder(const char *Filename)

{

  filename=strdup(Filename);

  locked=0; urgentLock=playing=false;

}

cDecoder::~cDecoder()

{

  free(filename);

}

void cDecoder::Lock(bool urgent)

{

  locklock.Lock();

  if(urgent && locked) urgentLock=true; // signal other locks to release quickly

  locked++;

  locklock.Unlock(); // don't hold the "locklock" when locking "lock", may cause a deadlock

  lock.Lock();

  urgentLock=false;

}

void cDecoder::Unlock(void)

{

  locklock.Lock();

  locked--;

  lock.Unlock();

  locklock.Unlock();

}

bool cDecoder::TryLock(void)

{

  bool res=false;

  locklock.Lock();

  if(!locked && !playing) {

    Lock();

    res=true;

    }

  locklock.Unlock();

  return res;

}

// --- cCacheData -----------------------------------------------------

cCacheData::cCacheData(void)

{

  touch=0; version=0;

}

void cCacheData::Touch(void)

{

  touch=time(0);

}

#define SECS_PER_DAY (24*60*60)

bool cCacheData::Purge(void)

{

  time_t now=time(0);

  //XXX does this realy made sense?

  //if(touch+CACHEPURGETIMEOUT*SECS_PER_DAY < now) {

  //  d(printf("cache: purged: timeout %s\n",Filename))

  //  return true;

  //  }

  if(touch+CACHEPURGETIMEOUT*SECS_PER_DAY/10 < now) {

    if(!Removable()) {                            // is this a permant source?

      struct stat64 ds;                           // does the file exists? if not, purge

      if(stat64(Filename,&ds) || !S_ISREG(ds.st_mode) || access(Filename,R_OK)) {

        d(printf("cache: purged: file not found %s\n",Filename))

        return true;

        }

      }

    }

  return false;

}

bool cCacheData::Check8bit(const char *str)

{

  if(str) while(*str) if(*str++ & 0x80) return true;

  return false;

}

bool cCacheData::Upgrade(void)

{

  if(version<8) {

    if(Check8bit(Title) || Check8bit(Artist) || Check8bit(Album))

      return false;              // Trash entries not 7bit clean

    }

  if(version<7) {

    if(DecoderID==DEC_SND || (Title && startswith(Title,"track-")))

      return false;              // Trash older SND entries (incomplete)

    if(Removable()) {

      if(!FsID) FsID=strdup("old"); // Dummy entry, will be replaced in InfoCache::Search()

      }

    else { free(FsID); FsID=0; }

    }

  if(version<4) {

    Touch();                     // Touch entry

    }

  if(version<3 && !Title) {

    FakeTitle(Filename,".mp3");  // Fake title

    }

  if(version<2 && Bitrate<=0) {

    return false;                // Trash entry without bitrate

    }

  return true;

}

void cCacheData::Create(cFileInfo *fi, cSongInfo *si, bool update)

{

  cFileInfo::Set(fi);

  cSongInfo::Set(si,update);

  hash=MakeHash(Filename);

  Touch();

}

bool cCacheData::Save(FILE *f)

{

  fprintf(f,"##BEGIN\n"

            "Filename=%s\n"

            "Filesize=%lld\n"

            "Timestamp=%ld\n"

            "Touch=%ld\n"

            "Version=%d\n"

            "Frames=%d\n"

            "Total=%d\n"

            "SampleFreq=%d\n"

            "Channels=%d\n"

            "Bitrate=%d\n"

            "MaxBitrate=%d\n"

            "ChMode=%d\n"

            "Year=%d\n"

            "Level=%.4f\n"

            "Peak=%.4f\n",

            Filename,Filesize,CTime,touch,CACHE_VERSION,Frames,Total,SampleFreq,Channels,Bitrate,MaxBitrate,ChMode,Year,Level,Peak);

  if(Title)     fprintf(f,"Title=%s\n"    ,Title);

  if(Artist)    fprintf(f,"Artist=%s\n"   ,Artist);

  if(Album)     fprintf(f,"Album=%s\n"    ,Album);

  if(DecoderID) fprintf(f,"DecoderID=%s\n",cDecoders::ID2Str(DecoderID));

  if(FsID)      fprintf(f,"FsID=%s\n"     ,FsID);

  fprintf(f,"##END\n");

  return ferror(f)==0;

}

bool cCacheData::Load(FILE *f)

{

  static const char delimiters[] = { "=\n" };

  char buf[1024];

  cFileInfo::Clear();

  cSongInfo::Clear();

  while(fgets(buf,sizeof(buf),f)) {

    char *ptrptr;

    char *name =strtok_r(buf ,delimiters,&ptrptr);

    char *value=strtok_r(0,delimiters,&ptrptr);

    if(name) {

      if(!strcasecmp(name,"##END")) break;

      if(value) {

        if     (!strcasecmp(name,"Filename"))   Filename  =strdup(value);

        else if(!strcasecmp(name,"Filesize") ||

                !strcasecmp(name,"Size"))       Filesize  =atoll(value);

        else if(!strcasecmp(name,"FsID"))       FsID      =strdup(value);

        else if(!strcasecmp(name,"Timestamp"))  CTime     =atol(value);

        else if(!strcasecmp(name,"Touch"))      touch     =atol(value);

        else if(!strcasecmp(name,"Version"))    version   =atoi(value);

        else if(!strcasecmp(name,"DecoderID"))  DecoderID =cDecoders::Str2ID(value);

        else if(!strcasecmp(name,"Frames"))     Frames    =atoi(value);

        else if(!strcasecmp(name,"Total"))      Total     =atoi(value);

        else if(!strcasecmp(name,"SampleFreq")) SampleFreq=atoi(value);

        else if(!strcasecmp(name,"Channels"))   Channels  =atoi(value);

        else if(!strcasecmp(name,"Bitrate"))    Bitrate   =atoi(value);

        else if(!strcasecmp(name,"MaxBitrate")) MaxBitrate=atoi(value);

        else if(!strcasecmp(name,"ChMode"))     ChMode    =atoi(value);

        else if(!strcasecmp(name,"Year"))       Year      =atoi(value);

        else if(!strcasecmp(name,"Title"))      Title     =strdup(value);

        else if(!strcasecmp(name,"Artist"))     Artist    =strdup(value);

        else if(!strcasecmp(name,"Album"))      Album     =strdup(value);

        else if(!strcasecmp(name,"Level"))      Level     =atof(value);

        else if(!strcasecmp(name,"Peak"))       Peak      =atof(value);

        else d(printf("cache: ignoring bad token '%s' from cache file\n",name))

        }

      }

    }

  if(ferror(f) || !Filename) return false;

  hash=MakeHash(Filename);

  return true;

}

// --- cInfoCache ----------------------------------------------------

cInfoCache::cInfoCache(void)

{

  lasttime=0; modified=false;

  lastpurge=time(0)-(50*60);

}

void cInfoCache::Shutdown(void)

{

  Cancel(10);

  Save(true);

}

void cInfoCache::Cache(cSongInfo *info, cFileInfo *file)

{

  lock.Lock();

  cCacheData *dat=Search(file);

  if(dat) {

    dat->Create(file,info,true);

    Modified();

    dat->Unlock();

    d(printf("cache: updating infos for %s\n",file->Filename))

    }

  else {

    dat=new cCacheData;

    dat->Create(file,info,false);

    AddEntry(dat);

    d(printf("cache: caching infos for %s\n",file->Filename))

    }

  lock.Unlock();

}

cCacheData *cInfoCache::Search(cFileInfo *file)

{

  int hash=MakeHash(file->Filename);

  lock.Lock();

  cCacheData *dat=FirstEntry(hash);

  while(dat) {

    if(dat->hash==hash && !strcmp(dat->Filename,file->Filename) && dat->Filesize==file->Filesize) {

      dat->Lock();

      if(file->FsID && dat->FsID && !strcmp(dat->FsID,"old")) { // duplicate FsID for old entries

        dat->FsID=strdup(file->FsID);

        dat->Touch(); Modified();

        //d(printf("adding FsID for %s\n",dat->Filename))

        }

      if((!file->FsID && !dat->FsID) || (file->FsID && dat->FsID && !strcmp(dat->FsID,file->FsID))) {

        //d(printf("cache: found cache entry for %s\n",dat->Filename))

        dat->Touch(); Modified();

        if(dat->CTime!=file->CTime) {

          d(printf("cache: ctime differs, removing from cache: %s\n",dat->Filename))

          DelEntry(dat); dat=0;

          }

        break;

        }

      dat->Unlock();

      }

    dat=(cCacheData *)dat->Next();

    }

  lock.Unlock();

  return dat;

}

void cInfoCache::AddEntry(cCacheData *dat)

{

  lists[dat->hash%CACHELINES].Add(dat);

  Modified();

}

void cInfoCache::DelEntry(cCacheData *dat)

{

  dat->Lock();

  lists[dat->hash%CACHELINES].Del(dat);

  Modified();

}

cCacheData *cInfoCache::FirstEntry(int hash)

{

  return lists[hash%CACHELINES].First();

}

bool cInfoCache::Purge(void)

{

  time_t now=time(0);

  if(now-lastpurge>(60*60)) {

    isyslog("cleaning up id3 cache");

    Start();

    lastpurge=now;

    }

  return Active();

}

void cInfoCache::Action(void)

{

  d(printf("cache: id3 cache purge thread started (pid=%d)\n",getpid()))

  if(nice(3)<0);

  lock.Lock();

  for(int i=0,n=0 ; i<CACHELINES && Running(); i++) {

    cCacheData *dat=FirstEntry(i);

    while(dat && Running()) {

      cCacheData *ndat=(cCacheData *)dat->Next();

      if(dat->Purge()) DelEntry(dat);

      dat=ndat;

      if(++n>30) {

        lastmod=false; n=0;

        lock.Unlock(); lock.Lock();    // give concurrent thread an access chance

        if(lastmod) dat=FirstEntry(i); // restart line, if cache changed meanwhile

        }

      }

    }

  lock.Unlock();

  d(printf("cache: id3 cache purge thread ended (pid=%d)\n",getpid()))

}

char *cInfoCache::CacheFile(void)

{

  return AddPath(cachedir?cachedir:VideoDirectory,CACHEFILENAME);

}

void cInfoCache::Save(bool force)

{

  if(modified && (force || (!Purge() && time(0)>lasttime))) {

    char *name=CacheFile();

    cSafeFile f(name);

    free(name);

    if(f.Open()) {

      lock.Lock();

      fprintf(f,"## This is a generated file. DO NOT EDIT!!\n"

                "## This file will be OVERWRITTEN WITHOUT WARNING!!\n");

      for(int i=0 ; i<CACHELINES ; i++) {

        cCacheData *dat=FirstEntry(i);

        while(dat) {

          if(!dat->Save(f)) { i=CACHELINES+1; break; }

          dat=(cCacheData *)dat->Next();

          }

        }

      lock.Unlock();

      f.Close();

      modified=false; lasttime=time(0)+CACHESAVETIMEOUT;

      d(printf("cache: saved cache to file\n"))

      }

    }

}

void cInfoCache::Load(void)

{

  if(!strconv) strconv=new cStrConv;

  char *name=CacheFile();

  if(access(name,F_OK)==0) {

    isyslog("loading id3 cache from %s",name);

    FILE *f=fopen(name,"r");

    if(f) {

      char buf[256];

      bool mod=false;

      lock.Lock();

      for(int i=0 ; i<CACHELINES ; i++) lists[i].Clear();

      while(fgets(buf,sizeof(buf),f)) {

        if(!strcasecmp(buf,"##BEGIN\n")) {

          cCacheData *dat=new cCacheData;

          if(dat->Load(f)) {

            if(dat->version!=CACHE_VERSION) {

              if(dat->Upgrade()) mod=true;

              else { delete dat; continue; }

              }

            AddEntry(dat);

            }

          else {

            delete dat;

            if(ferror(f)) {

              esyslog("ERROR: failed to load id3 cache");

              break;

              }

            }

          }

        }

      lock.Unlock();

      fclose(f);

      modified=false; if(mod) Modified();

      }

    else LOG_ERROR_STR(name);

    }

  free(name);

}