//-*- Mode: C++ -*-
// $Id$

#ifndef ALIHLTESDMANAGERIMPLEMENTATION_H
#define ALIHLTESDMANAGERIMPLEMENTATION_H
//* This file is property of and copyright by the ALICE HLT Project        * 
//* ALICE Experiment at CERN, All rights reserved.                         *
//* See cxx source for full Copyright notice                               *

/** @file   AliHLTEsdManagerImplementation.h
    @author Matthias Richter
    @date   
    @brief  Implementation of the AliHLTEsdManager
*/

#include "AliHLTEsdManager.h"
#include "TString.h"
#include <vector>

class AliESDEvent;
class TTree;
class TFile;

/**
 * @class AliHLTEsdManagerImplementation
 * Implementation of the AliHLTEsdManager.
 *
 * For the sake of library (in)dependencies, the concrete implementation of
 * the AliHLTEsdManager is separated from the libHLTbase class as this would
 * introduce dependencies to AliRoot libraries. See AliHLTEsdManager for
 * usage.
 *
 * @ingroup alihlt_aliroot_reconstruction
 */
class AliHLTEsdManagerImplementation : public AliHLTEsdManager {
 public:
  /** constructor */
  AliHLTEsdManagerImplementation();
  /** destructor */
  virtual ~AliHLTEsdManagerImplementation();

  /**
   * Inherited from base class, see AliHLTEsdManager::SetOption() for
   * documentation.
   */
  virtual int SetOption(const char* option);

  /**
   * Convert data buffer to ESD.
   * The buffer is supposed to describe a streamed AliESDEvent object.
   * If no target object is specified, the ESD is written to a file AliHLTdetESDs.root,
   * where 'det' is derived from the data type origin. Each time the function is invoked
   * a new event is created. Dummy events are added if the previous events did not contain
   *
   * @param pBuffer  [in] the data buffer
   * @param size     [in] data buffer size
   * @param dt       [in] data type of the block
   * @param tgtesd   [out] optional target
   * @param eventno  [in] optional event no
   */
  int WriteESD(const AliHLTUInt8_t* pBuffer, AliHLTUInt32_t size, AliHLTComponentDataType dt,
	       AliESDEvent* tgtesd=NULL, int eventno=-1);

  /**
   * Merge content of source ESD into the target ESD.
   * Merging is done on the level of objects in the ESD and for the
   * moment it's only implemented for the TClonesArrays. In that case it's
   * easy to detect whether the object is empty or not.
   *
   * \b Note: The function can not match entries of the same type, like e.g.
   * tracks from the 'Tracks' member.
   */
  int Merge(AliESDEvent* pTgt, AliESDEvent* pSrc) const;

  /**
   * Align all ESD to the same number of events.
   * The function adds empty events to all ESD files if their event number
   * does not match the specified one.
   * @param eventno     the desired event no
   * @return neg. error code if failed
   */
  int PadESDs(int eventno);

  /**
   * Set the target directory for the ESD files.
   */
  void SetDirectory(const char* directory);

  /**
   * Get the list of the internally created files.
   * Returns a blank separated list of the file names.
   */
  TString GetFileNames(AliHLTComponentDataType dt=kAliHLTAnyDataType) const;

  /**
   * Embed an ESD into a TTree object.
   * The tree object needs to be deleted by the caller.
   */
  static TTree* EmbedIntoTree(AliESDEvent* pESD, const char* name="esdTree", const char* title="Tree with HLT ESD objects");

 protected:

 private:
  /** copy constructor prohibited */
  AliHLTEsdManagerImplementation(const AliHLTEsdManagerImplementation&);
  /** assignment operator prohibited */
  AliHLTEsdManagerImplementation& operator=(const AliHLTEsdManagerImplementation&);

  class AliHLTEsdListEntry : public AliHLTLogging {
  public:
    /** constructor */
    AliHLTEsdListEntry(AliHLTComponentDataType dt);
    /** destructor */
    ~AliHLTEsdListEntry();

    /**
     * Write the ESD to the corresponding file.
     * The tree is first synchronized with the eventno and additional empty
     * events might be inserted if there was a gap. Since we are writing
     * several files in parallel, we have to make sure that those files contain
     * the same number of events.
     * @param pESD        ESD to write
     * @param eventno     optional event no for tree synchronization
     */
    int WriteESD(AliESDEvent* pESD, int eventno=-1);

    /**
     * Set the target directory for the ESD file.
     */
    void SetDirectory(const char* directory);

    /**
     * Delete the ESD file.
     */
    void Delete();

    /**
     * Get name of the ESD file.
     */
    const char* GetFileName() const;

    /**
     * Get the object name prefix generated from the data origin
     * The prefix is added to the names of the ESD objects when copied to the
     * master ESD.
     */
    const char* GetPrefix();

    bool operator==(AliHLTComponentDataType dt) const;

  private:
    /** copy constructor prohibited */
    AliHLTEsdListEntry(const AliHLTEsdListEntry& src);
    /** assignment operator prohibited */
    AliHLTEsdListEntry& operator=(const AliHLTEsdListEntry& src);

    /**
     * Write ESD to temporary file.
     * The ESD is embedded into a tree and saved to a temporary file.
     * The file name is retrieved by TSystem::GetTempFileName and returned
     * on success.
     * @return file name, empty on failure
     */
    TString WriteTempFile(AliESDEvent* pESD) const;

    /** root file name */
    TString fName; //!transient
    /** target directory */
    TString fDirectory; //!transient
    /** data type of the corresponding block */
    AliHLTComponentDataType fDt; //!transient
    /** the root file for this esd */
    TFile* fpFile; //!transient
    /** the tree for this esd */
    TTree* fpTree; //!transient
    /** the esd to fill into the tree */
    AliESDEvent* fpEsd; //!transient
    /** Prefix for generated ESD objects in the master ESD */
    TString fPrefix; //!transient
  };

  typedef vector<AliHLTEsdListEntry*> AliHLTEsdPList;

  /**
   * Find list entry for given data type
   */
  AliHLTEsdListEntry* Find(AliHLTComponentDataType dt) const;

  /** the list of the ESDs */
  AliHLTEsdPList fESDs; //!transient

  /** target directory */
  TString fDirectory; //!transient
  /** write local files */
  bool fWriteLocal; //!transient

  ClassDef(AliHLTEsdManagerImplementation, 2)
};

#endif