#include "EventFilter/GctRawToDigi/plugins/GctRawToDigi.h"

// System headers
#include <vector>
#include <sstream>
#include <iostream>

// Framework headers
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/MakerMacros.h"

// Raw data collection headers
#include "DataFormats/FEDRawData/interface/FEDNumbering.h"
#include "DataFormats/FEDRawData/interface/FEDRawDataCollection.h"

// GCT Format Translators
#include "EventFilter/GctRawToDigi/src/GctFormatTranslateMCLegacy.h"
#include "EventFilter/GctRawToDigi/src/GctFormatTranslateV35.h"
#include "EventFilter/GctRawToDigi/src/GctFormatTranslateV38.h"

// Unpack collections class
#include "EventFilter/GctRawToDigi/src/GctUnpackCollections.h"

// Namespace resolution
using std::cout;
using std::dec;
using std::endl;
using std::hex;
using std::string;
using std::vector;

GctRawToDigi::GctRawToDigi(const edm::ParameterSet& iConfig)
    : inputLabel_(iConfig.getParameter<edm::InputTag>("inputLabel")),
      fedId_(iConfig.getUntrackedParameter<int>("gctFedId", FEDNumbering::MINTriggerGCTFEDID)),
      hltMode_(iConfig.getParameter<bool>("hltMode")),
      numberOfGctSamplesToUnpack_(iConfig.getParameter<unsigned>("numberOfGctSamplesToUnpack")),
      numberOfRctSamplesToUnpack_(iConfig.getParameter<unsigned>("numberOfRctSamplesToUnpack")),
      unpackSharedRegions_(iConfig.getParameter<bool>("unpackSharedRegions")),
      formatVersion_(iConfig.getParameter<unsigned>("unpackerVersion")),
      checkHeaders_(iConfig.getUntrackedParameter<bool>("checkHeaders", false)),
      verbose_(iConfig.getUntrackedParameter<bool>("verbose", false)),
      formatTranslator_(nullptr),
      errors_(nullptr),
      errorCounters_(MAX_ERR_CODE + 1),  // initialise with the maximum error codes!
      unpackFailures_(0) {
  LogDebug("GCT") << "GctRawToDigi will unpack FED Id " << fedId_;

  // If the GctFormatTranslate version has been forced from config file, instantiate the relevant one.
  /***  THIS OBVIOUSLY STINKS - NEED TO REPLACE WITH SOMETHING BETTER THAN MASSIVE IF-ELSE SOON ***/
  /***  WHEN THIS MESS IS REMOVED REMEMBER THAT THE V38 FORMAT TRANSLATE HAS A DIFERENT CTOR TO THE OTHERS ***/
  if (formatVersion_ == 0) {
    edm::LogInfo("GCT")
        << "The required GCT Format Translator will be automatically determined from the first S-Link packet header.";
  } else if (formatVersion_ == 1) {
    edm::LogInfo("GCT") << "You have selected to use GctFormatTranslateMCLegacy";
    formatTranslator_ = new GctFormatTranslateMCLegacy(hltMode_, unpackSharedRegions_);
  } else if (formatVersion_ == 2) {
    edm::LogInfo("GCT") << "You have selected to use GctFormatTranslateV35";
    formatTranslator_ = new GctFormatTranslateV35(hltMode_, unpackSharedRegions_);
  } else if (formatVersion_ == 3) {
    edm::LogInfo("GCT") << "You have selected to use GctFormatTranslateV38";
    formatTranslator_ = new GctFormatTranslateV38(
        hltMode_, unpackSharedRegions_, numberOfGctSamplesToUnpack_, numberOfRctSamplesToUnpack_);
  } else {
    edm::LogWarning("GCT")
        << "You have requested a version of GctFormatTranslate that does not exist! Will attempt to auto-detect "
           "the required GCT Format Translator from the first S-Link packet header instead.";
  }

  if (hltMode_) {
    edm::LogInfo("GCT") << "HLT unpack mode selected: HLT unpack optimisations will be used.";
  }
  if (unpackSharedRegions_) {
    edm::LogInfo("GCT") << "You have selected to unpack shared RCT calo regions - be warned: "
                           "this is for commissioning purposes only!";
  }

  /** Register Products **/
  // GCT input collections
  produces<L1GctFibreCollection>();
  produces<L1CaloEmCollection>();
  produces<L1CaloRegionCollection>();

  // GCT internal collections
  produces<L1GctInternEmCandCollection>();
  produces<L1GctInternJetDataCollection>();
  produces<L1GctInternEtSumCollection>();
  produces<L1GctInternHFDataCollection>();
  produces<L1GctInternHtMissCollection>();

  // GCT output collections
  produces<L1GctEmCandCollection>("isoEm");
  produces<L1GctEmCandCollection>("nonIsoEm");
  produces<L1GctJetCandCollection>("cenJets");
  produces<L1GctJetCandCollection>("forJets");
  produces<L1GctJetCandCollection>("tauJets");
  produces<L1GctHFBitCountsCollection>();
  produces<L1GctHFRingEtSumsCollection>();
  produces<L1GctEtTotalCollection>();
  produces<L1GctEtHadCollection>();
  produces<L1GctEtMissCollection>();
  produces<L1GctHtMissCollection>();
  produces<L1GctJetCountsCollection>();  // Deprecated (empty collection still needed by GT)

  // Error collection
  produces<L1TriggerErrorCollection>();
  consumes<FEDRawDataCollection>(inputLabel_);
}

GctRawToDigi::~GctRawToDigi() {
  // do anything here that needs to be done at destruction time
  // (e.g. close files, deallocate resources etc.)
  delete formatTranslator_;
}

void GctRawToDigi::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  edm::ParameterSetDescription desc;
  desc.add<bool>("unpackSharedRegions", false);
  desc.add<unsigned int>("numberOfGctSamplesToUnpack", 1);
  desc.add<unsigned int>("numberOfRctSamplesToUnpack", 1);
  desc.add<bool>("hltMode", false);
  desc.add<edm::InputTag>("inputLabel", edm::InputTag("rawDataCollector"));
  static const char* const kComment =
      " \n"
      "   value   |                        Unpacker/RAW Format Version \n"
      "-----------|---------------------------------------------------------------------------- \n"
      "     0     |   Auto-detects RAW Format in use - the recommended option \n"
      "     1     |   Force usage of the Monte-Carlo Legacy unpacker (unpacks DigiToRaw events) \n"
      "     2     |   Force usage of the RAW Format V35 unpacker \n"
      "     3     |   Force usage of the RAW Format V38 unpacker \n";
  desc.add<unsigned int>("unpackerVersion", 0)->setComment(kComment);
  desc.addUntracked<int>("gctFedId", 745);
  desc.addUntracked<bool>("checkHeaders", false), desc.addUntracked<bool>("verbose", false);
  descriptions.add("gctRawToDigi", desc);
}

//
// member functions
//

// ------------ method called to produce the data  ------------
void GctRawToDigi::produce(edm::Event& iEvent, const edm::EventSetup& iSetup) {
  using namespace edm;

  // Instantiate all the collections the unpacker needs; puts them in event when this object goes out of scope.
  std::unique_ptr<GctUnpackCollections> colls(new GctUnpackCollections(iEvent));
  errors_ = colls->errors();

  // get raw data collection
  edm::Handle<FEDRawDataCollection> feds;
  iEvent.getByLabel(inputLabel_, feds);

  // if raw data collection is present, do the unpacking
  if (feds.isValid()) {
    const FEDRawData& gctRcd = feds->FEDData(fedId_);

    LogDebug("GCT") << "Upacking FEDRawData of size " << std::dec << gctRcd.size();

    // check for empty events
    if (gctRcd.size() < 16) {
      LogDebug("GCT") << "Cannot unpack: empty/invalid GCT raw data (size = " << gctRcd.size()
                      << "). Returning empty collections!";
      addError(1);
      return;
    }

    // If no format translator yet set, need to auto-detect from header.
    // If auto format detection fails, we have no concrete format
    // translator instantiated... set error and bail
    if (!formatTranslator_) {
      if (!autoDetectRequiredFormatTranslator(gctRcd.data()))
        return;
    }

    // reset collection of block headers
    blockHeaders_.clear();

    // do the unpacking
    unpack(gctRcd, iEvent, colls.get());

    // check headers, if enabled
    if (checkHeaders_)
      checkHeaders();

    // dump summary in verbose mode
    if (verbose_) {
      doVerboseOutput(blockHeaders_, colls.get());
    }
  }
}

void GctRawToDigi::unpack(const FEDRawData& d, edm::Event& e, GctUnpackCollections* const colls) {
  // We should now have a valid formatTranslator pointer
  formatTranslator_->setUnpackCollections(colls);

  const unsigned char* data = d.data();  // The 8-bit wide raw-data array.

  // Data offset - starts at 16 as there is a 64-bit S-Link header followed
  // by a 64-bit software-controlled header (for pipeline format version
  // info that is not yet used).
  unsigned dPtr = 16;

  const unsigned dEnd = d.size() - 8;  // End of payload is at (packet size - final slink header)

  // read blocks
  for (unsigned nb = 0; dPtr < dEnd; ++nb) {
    if (nb >= MAX_BLOCKS) {
      LogDebug("GCT") << "Reached block limit - bailing out from this event!";
      addError(6);
      break;
    }

    // read block header
    GctBlockHeader blockHeader = formatTranslator_->generateBlockHeader(&data[dPtr]);

    // unpack the block; dPtr+4 is to get to the block data.
    if (!formatTranslator_->convertBlock(&data[dPtr + 4],
                                         blockHeader))  // Record if we had an unpack problem then skip rest of event.
    {
      LogDebug("GCT") << "Encountered block unpack error - bailing out from this event!";
      addError(4);
      break;
    }

    // advance pointer
    dPtr += 4 * (blockHeader.blockLength() * blockHeader.nSamples() +
                 1);  // *4 because blockLen is in 32-bit words, +1 for header

    // if verbose or checking block headers, store the header
    if (verbose_ || checkHeaders_)
      blockHeaders_.push_back(blockHeader);
  }
}

// detect raw data format version from known raw data address
bool GctRawToDigi::autoDetectRequiredFormatTranslator(const unsigned char* d) {
  LogDebug("GCT") << "About to auto-detect the required format translator from the firmware version header.";

  const uint32_t* p32 = reinterpret_cast<const uint32_t*>(d);
  unsigned firmwareHeader = p32[2];

  /***  THIS OBVIOUSLY STINKS - NEED TO REPLACE WITH SOMETHING BETTER THAN MASSIVE IF-ELSE SOON ***/
  /***  WHEN THIS MESS IS REMOVED REMEMBER THAT THE V38 FORMAT TRANSLATE HAS A DIFERENT CTOR TO THE OTHERS ***/

  if (firmwareHeader >= 25 && firmwareHeader <= 35) {
    edm::LogInfo("GCT") << "Firmware Version V" << firmwareHeader << " detected: GctFormatTranslateV" << firmwareHeader
                        << " will be used to unpack.";
    formatTranslator_ = new GctFormatTranslateV35(hltMode_, unpackSharedRegions_);
    return true;
  } else if (firmwareHeader == 38) {
    edm::LogInfo("GCT") << "Firmware Version V" << firmwareHeader << " detected: GctFormatTranslateV" << firmwareHeader
                        << " will be used to unpack.";
    formatTranslator_ = new GctFormatTranslateV38(
        hltMode_, unpackSharedRegions_, numberOfGctSamplesToUnpack_, numberOfRctSamplesToUnpack_);
    return true;
  } else if (firmwareHeader == 0x00000000) {
    edm::LogInfo("GCT") << "Legacy Monte-Carlo data detected: GctFormatTranslateMCLegacy will be used to unpack.";
    formatTranslator_ = new GctFormatTranslateMCLegacy(hltMode_, unpackSharedRegions_);
    return true;
  }
  // these lines comments otherwise error is not reported!!!
  //  else if(firmwareHeader == 0xdeadffff) { /* Driver detected unknown firmware version. L1TriggerError code? */ }
  //  else if( firmwareHeader == 0xaaaaaaaa) { /* Before driver firmware version checks implemented. L1TriggerError code?  */ }
  else { /* Totally unknown firmware header */

    LogDebug("GCT") << "Failed to determine unpacker to use from the firmware version header! "
                       "(firmware header = 0x"
                    << hex << firmwareHeader << dec << ")";
    addError(2);
    return false;
  }
}

void GctRawToDigi::checkHeaders() {
  // TODO : loop over block headers found this event and check for consistency
}

void GctRawToDigi::doVerboseOutput(const GctBlockHeaderCollection& bHdrs,
                                   const GctUnpackCollections* const colls) const {
  std::ostringstream os;
  os << "Found " << bHdrs.size() << " GCT block headers" << endl;
  for (unsigned i = 0, size = bHdrs.size(); i < size; ++i) {
    os << "GCT Raw Data Block : " << formatTranslator_->getBlockDescription(bHdrs[i]) << " : " << bHdrs[i] << endl;
  }
  os << *colls << endl;
  edm::LogVerbatim("GCT") << os.str();
}

void GctRawToDigi::addError(const unsigned code) {
  // check this isn't going to break error handling
  if (code > MAX_ERR_CODE) {
    LogDebug("GCT") << "Unknown error code : " << code;
    return;
  }

  // print message on first instance of this error and if verbose flag set to true
  if (errorCounters_.at(code) == 0 && verbose_) {
    std::ostringstream os;
    switch (code) {
      case 0:
        os << "Reserved error code - not in use";
        break;
      case 1:
        os << "FED record empty or too short";
        break;
      case 2:
        os << "Unknown raw data version";
        break;
      case 3:
        os << "Detected unknown firmware version";
        break;
      case 4:
        os << "Detected unknown data block";
        break;
      case 5:
        os << "Block headers out of sync";
        break;
      case 6:
        os << "Too many blocks";
        break;
      default:
        os << "Unknown error code";
    }
    edm::LogError("GCT") << "Unpacking error " << code << " : " << os.str();
  }

  // increment error counter
  ++(errorCounters_.at(code));

  // store error in event if possible
  if (errors_ != nullptr) {
    errors_->push_back(L1TriggerError(fedId_, code));
  } else
    LogDebug("GCT") << "Detected error (code=" << code << ") but no error collection available!";
}

// ------------ method called once each job just after ending the event loop  ------------
void GctRawToDigi::endJob() {
  unsigned total = 0;
  std::ostringstream os;

  for (unsigned i = 0; i <= MAX_ERR_CODE; ++i) {
    total += errorCounters_.at(i);
    os << "Error " << i << " (" << errorCounters_.at(i) << ")";
    if (i < MAX_ERR_CODE) {
      os << ", ";
    }
  }

  if (total > 0 && verbose_) {
    edm::LogError("GCT") << "Encountered " << total << " unpacking errors: " << os.str();
  }
}

/// make this a plugin
DEFINE_FWK_MODULE(GctRawToDigi);