#pragma once
#include <AwFileIO.h> // AnyWave base class header
#include <QFile>      // Qt QFile object
 
class Q_DECL_EXPORT MyReader : public AwFileIO
{
   Q_OBJECT
   Q_INTERFACES(AwFileIO)
public:
   explicit MyReader(const QString& fileName);
   ~MyReader();
 
  qint64 readDataFromChannels(float start, float duration, QList<AwChannel *>& channels) override;
  AwFileIO::FileStatus openFile(const QString &path) override;
  AwFileIO::FileStatus canRead(const QString &path) override;
  void cleanUpAndClose() override;
protected:
// keep a file object to read data
   QFile m_dataFile;
};
 
class Q_DECL_EXPORT MyReaderPlugin : public AwFileIOPlugin
{
   Q_OBJECT
   Q_INTERFACES(AwFileIOPlugin)
   Q_PLUGIN_METADATA(IID AwFileIOInterfacePlugin_IID)
public:
   MyReaderPlugin();
   MyReader *newInstance(const QString& fileName) { return new MyReader(fileName); }
};

explicit MyReader(const QString& fileName);
~MyReader();

#include "MyReader.h"
 
// constructor for reader object
MyReader::MyReader(const QString& fileName) : AwFileIO(fileName)
{
   // do some inits here.
}
 
// constructor of Plugin object
// Here we will define the name of our Plugin and it's properties/flags for AnyWave
MyReaderPlugin::MyReaderPlugin() : AwFileIOPlugin()
{
   // define the name (must be unique in AnyWave)
   name = QString("MyReader Plugin");
   // short description of what the plugin does.
   description = QString("Read My Format");
   // info about manufacturer/author
   manufacturer = QString("Myself");
   // version string
   version = QString("1.0");
   // the file extensions the reader can open.
   fileExtensions = { ".myr" };
   // Flags to define the behavior in AnyWave
   m_flags = Aw::HasExtension|Aw::CanRead; // Here we tell AnyWave that the plugin handle file extension (mostly the case)
  // and we also specify CanRead flag to tell AnyWave that this is a READER plugin.
}

#include "MyReader.h"
#include <QFile>
 
///
/// canRead : use to open a file and check if the format is ok.
/// Returns a flag informing AnyWave that we can or can't read that file.
AwFileIO::FileStatus MyReader::canRead(const QString& fileName)
{
    // Here we won't really open the file, we are just going to check if we can.
 
   // Let's suppose or .myr format is a text header file where the first line is a string with the following keyword "MYFORMAT".
 
   QFile file(fileName);
   if (file.open(QIODevice::ReadOnly|QIODevice::Text) // try to open as a text file.
   {
       QString line = file.readLine(); // read the first line.  
       file.close(); 
       if (line == "MYFORMAT") {
           return AwFileIO::NoError;  // it's OUR format!
       }
   }
   return AwFileIO::WrongFormat;  // We don't know this file format.
}

#include "MyReader.h"
#include <QFile>
 
AwFileIO::FileStatus MyReader::openFile(const QString& fileName)
{
    // open the text header file and get informations about what is present in the data file.
    // We suppose that a binary data file is associated to the header file (like in the ADES format).
    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly|QIODevice::Text)  {
       // failed to open the header file: provide an error message and quit.
       m_error = QString("Failed to open the file.");
       return AwFileStatus::FileAccess;
    }
    // read first line (remember MYFORMAT tag)
   file.readLine();
   // the second line contains the global sampling rate of data
   // We store that information in a member variable for further use in readDataFromChannels.
   m_samplingRate = (float)file.readLine().toDouble();
   // the next line contains the total number of samples per channel.
   qint64 nSamples = file.readLine().toInt();
   // the next line contains the number of channels and their order in the data.
   int nChannels = file.readLine().toInt();
   // the following lines contains all the electrode labels of the corresponding channels.
   // Use a list to store them
   QStringList labels, types;
   for (auto i = 0; i < nChannels; i++) // now get all the channels label
      labels.append(file.readLine());
   // the following lines (nChannels) contains the types of the channels (EEG, SEEG, Other, ECG, ...)
   // We suppose the types are compatible with the ones AnyWave can handle.
   for (auto i = 0; i < nChannels; i++) 
      types.append(file.readLine());
 
   // ok now we can add the channels to the info object of our plugin:
   for (auto i = 0; i < nChannels; i++) {
      AwChannel channel;
      channel.setName(labels.at(i));
      channel.setType(AwChannel::stringToType(types.at(i)));
      channel.setSamplingRate(samplingRate);
      // adjust the unit and default gain depending on type:
      if (channel.isEEG() || channel.isSEEG())
         channel.setUnit(QString::fromLatin1("µv"));
      if (channel.isMEG() || channel.isReference())
         channel.setUnit("pT");
 
      infos.addChannel(channel);
   }
   // A Block is the basic data set object AnyWave uses.
   AwBlock *block = infos.newBlock(); // instantiate a new data set using the infos object (a member of AwFileIO).
   // set the number of samples in the block
   block->setSamples(nSamples);
   // set also the duration in seconds
   block->setDuration(nSamples / samplingRate); 
 
   // Done
   file.close();
   // we suppose the binary file has got he same filename but a .dat extension.
   // So open our binary file for further use (in the readDataFromChannels method).
   // replace .myr extension with .dat
   QString dataFileName = fileName;
   dataFileName.replace(QString(".myr"), QString(".dat");
 
   if (!m_dataFile.open(QIODevice::ReadOnly)) {
      m_error = "Could not open the binary file.";
      return AwFileIO::FileAcess
   }
 
  // we're ok the binary file is open.   
   return AwFileIO::NoError;
}

#include "MyReader.h"
 
///
/// readDataFromChannels expects a position in the file (start) and a duration in seconds (duration).
/// It will read the data for the requested channels (channels).
/// Returns the number of samples read for a channel.
/// Returns 0 if no data could be loaded.
qin64 MyReader::readDataFromChannels(float start, float duration, AwChannelList& channels)
{
   // basic checking
   if (channels.isEmpty())  
      return;
 
   // number of samples to read
   qint64 nSamples = (qint64)floor(duration * m_samplingRate);
   // offset sample in channel
   qint64 nStart = (qint64)floor(start * m_samplingRate);
   // total number of channels in the file:
   auto nChannels = infos.channelsCount();
   // Starting sample in the file.
   qint64 startSample = nStart * nChannels;
 
   // check positions and samples
   if (nSamples <= 0 || nStart > infos.totalSamples())
      return 0;
 
   // check if the length requested goes beyond the file limit:
   if (nStart + nSamples > infos.totalSamples())
      nSamples = info.totalSamples() - nStart;  // reduce the number of samples to read to match the file limit.
 
   // total number of samples to read
   qint64 totalSize = nSamples * nChannels;
 
   // instantiate a buffer to read samples 
   float *buf = new float[totalSize];
   // Set the file position
   m_dataFile.seek(startSample * sizeof(float));
   // read data
   qint64 = m_dataFile.read((char *)buf, totalSize * sizeof(float));
   if (read <= 0) {
      delete[] buf;
      return 0;
   }
 
   // compute the real number of samples successfully read.
   read /= sizeof(float);
   read /= nChannels;
 
   // ok now fill the data vector of the requested channels:
   for (auto c : channels) {
      int index = infos.indexOfChannel(c->name());
      float *data = c->newData(read); // replace the current data vector of the channel by a new one. The size of vector is the number of samples read.
      qint64 count = 0;
      while (count++ < read) // get the data from the buffer for the current channel.
         *data++ = (float)buf[index + count * nChannels];
   }
   // Done, free the buffer and finish.
   delete[] buf;
   return read;
}