#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <string>
#include <algorithm>
#include <limits>
#include <stdexcept>
#include <stdint.h>

#include "GenericIO.h"

using namespace gio;
using namespace std;

int main(int argc, char *argv[]) {
#ifndef GENERICIO_NO_MPI
  MPI_Init(&argc, &argv);
#endif

  if (argc < 2) {
    cerr << "Usage: " << argv[0] << " [-v] <mpiioName1> <mpiioName2> ..." << endl;
    exit(-1);
  }

  int arg = 1;
  bool Verbose = false;
  if (string(argv[arg]) == "-v") {
    Verbose = true;
    ++arg;
  }

  int Rank, NRanks;
#ifndef GENERICIO_NO_MPI
  MPI_Comm_rank(MPI_COMM_WORLD, &Rank);
  MPI_Comm_size(MPI_COMM_WORLD, &NRanks);
#else
  Rank = 0;
  NRanks = 1;
#endif

  bool AllOkay = true;

  for (; arg < argc; ++arg) {
    string FileName(argv[arg]);

    try {
      if (Verbose) cout << "verifying: " << FileName << endl;

      unsigned Method = GenericIO::FileIOPOSIX;
#ifndef GENERICIO_NO_MPI
      const char *EnvStr = getenv("GENERICIO_USE_MPIIO");
      if (EnvStr && string(EnvStr) == "1")
        Method = GenericIO::FileIOMPI;
#endif

#ifndef GENERICIO_NO_MPI
      GenericIO GIO(MPI_COMM_WORLD, FileName, Method);
#else
      GenericIO GIO(FileName, Method);
#endif

#ifndef GENERICIO_NO_MPI
      bool MustMatch = true;
#else
      bool MustMatch = false;
#endif
      GIO.openAndReadHeader(MustMatch);
      if (Verbose) cout << "\theader: okay" << endl;


      vector<GenericIO::VariableInfo> VI;
      GIO.getVariableInfo(VI);

#ifndef GENERICIO_NO_MPI
      size_t MaxNElem = GIO.readNumElems();
#else
      size_t MaxNElem = 0;
      int NR = GIO.readNRanks();
      for (int i = 0; i < NR; ++i) {
        size_t NElem = GIO.readNumElems(i);
        MaxNElem = max(MaxNElem, NElem);
      }
#endif

      vector< vector<char> > Vars(VI.size());
      for (size_t i = 0; i < VI.size(); ++i) {
        Vars[i].resize(VI[i].Size*MaxNElem + GIO.requestedExtraSpace());
        GIO.addVariable(VI[i], &Vars[i][0], true);
      }

#ifndef GENERICIO_NO_MPI
      GIO.readData(-1, false);
      if (Verbose) cout << "\tdata from rank " << Rank << ": okay" << endl;
#else
      for (int i = 0; i < NR; ++i) {
        GIO.readData(i, false);
        if (Verbose) cout << "\tdata from rank " << i << ": okay" << endl;
      }
#endif

      if (Rank == 0) {
        cout << FileName << ": okay" << endl;
        cout.flush();
      }
    } catch (exception &e) {
      cerr << "ERROR: " << FileName << ": " << e.what() << endl;
      cerr.flush();
      AllOkay = false;
    }
  }

#ifndef GENERICIO_NO_MPI
  MPI_Barrier(MPI_COMM_WORLD);
  MPI_Finalize();
#endif

  return AllOkay ? 0 : 1;
}