#include "./file.hpp"
#include "./base.hpp"

namespace triqs {
namespace h5 {

 file::file(const char* name, unsigned flags) {

  if ((flags == H5F_ACC_RDWR) || (flags == H5F_ACC_RDONLY)) {
   id = H5Fopen(name, flags, H5P_DEFAULT);
   if (id < 0) TRIQS_RUNTIME_ERROR << "HDF5 : can not open file" << name;
   return;
  }

  if (flags == H5F_ACC_TRUNC) {
   id = H5Fcreate(name, flags, H5P_DEFAULT, H5P_DEFAULT);
   if (id < 0) TRIQS_RUNTIME_ERROR << "HDF5 : can not create file " << name;
   return;
  }

  if (flags == H5F_ACC_EXCL) {
   id = H5Fcreate(name, flags, H5P_DEFAULT, H5P_DEFAULT);
   if (id < 0) TRIQS_RUNTIME_ERROR << "HDF5 : can not create file " << name << ". Does it exists ?";
   return;
  }

  TRIQS_RUNTIME_ERROR << "HDF5 file opening : flag not recognized";
 }

 //---------------------------------------------

 file::file (hid_t id_) : h5_object(h5_object(id_)){}

 file::file(h5_object obj) : h5_object(std::move(obj)) {
  if (!H5Iis_valid(this->id)) TRIQS_RUNTIME_ERROR << "Invalid input in h5::file constructor from id";
  if (H5Iget_type(this->id) != H5I_FILE) TRIQS_RUNTIME_ERROR << "h5::file constructor must take the id of a file ";
 }

 //---------------------------------------------

 std::string file::name() const { // same function as for group
  char _n[1];
  ssize_t size = H5Fget_name(id, _n, 1); // first call, get the size only
  std::vector<char> buf(size + 1, 0x00);
  H5Fget_name(id, buf.data(), 1); // now get the name
  std::string res = "";
  res.append(&(buf.front()));
  return res;
 }
}
}