/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#include "tensorflow/core/framework/types.h"
#include "tensorflow/core/framework/register_types.h"

#include "tensorflow/core/lib/strings/str_util.h"
#include "tensorflow/core/lib/strings/strcat.h"
#include "tensorflow/core/platform/logging.h"

namespace tensorflow {

bool DeviceType::operator<(const DeviceType& other) const {
  return type_ < other.type_;
}

bool DeviceType::operator==(const DeviceType& other) const {
  return type_ == other.type_;
}

std::ostream& operator<<(std::ostream& os, const DeviceType& d) {
  os << d.type();
  return os;
}

const char* const DEVICE_CPU = "CPU";
const char* const DEVICE_GPU = "GPU";
const char* const DEVICE_SYCL = "SYCL";

string DataTypeString(DataType dtype) {
  if (IsRefType(dtype)) {
    DataType non_ref = static_cast<DataType>(dtype - kDataTypeRefOffset);
    return strings::StrCat(DataTypeString(non_ref), "_ref");
  }
  switch (dtype) {
    case DT_INVALID:
      return "INVALID";
    case DT_FLOAT:
      return "float";
    case DT_DOUBLE:
      return "double";
    case DT_INT32:
      return "int32";
    case DT_UINT8:
      return "uint8";
    case DT_UINT16:
      return "uint16";
    case DT_INT16:
      return "int16";
    case DT_INT8:
      return "int8";
    case DT_STRING:
      return "string";
    case DT_COMPLEX64:
      return "complex64";
    case DT_COMPLEX128:
      return "complex128";
    case DT_INT64:
      return "int64";
    case DT_BOOL:
      return "bool";
    case DT_QINT8:
      return "qint8";
    case DT_QUINT8:
      return "quint8";
    case DT_QUINT16:
      return "quint16";
    case DT_QINT16:
      return "qint16";
    case DT_QINT32:
      return "qint32";
    case DT_BFLOAT16:
      return "bfloat16";
    case DT_HALF:
      return "half";
    case DT_RESOURCE:
      return "resource";
    default:
      LOG(ERROR) << "Unrecognized DataType enum value " << dtype;
      return strings::StrCat("unknown dtype enum (", dtype, ")");
  }
}

bool DataTypeFromString(StringPiece sp, DataType* dt) {
  if (sp.ends_with("_ref")) {
    sp.remove_suffix(4);
    DataType non_ref;
    if (DataTypeFromString(sp, &non_ref) && !IsRefType(non_ref)) {
      *dt = static_cast<DataType>(non_ref + kDataTypeRefOffset);
      return true;
    } else {
      return false;
    }
  }

  if (sp == "float" || sp == "float32") {
    *dt = DT_FLOAT;
    return true;
  } else if (sp == "double" || sp == "float64") {
    *dt = DT_DOUBLE;
    return true;
  } else if (sp == "int32") {
    *dt = DT_INT32;
    return true;
  } else if (sp == "uint8") {
    *dt = DT_UINT8;
    return true;
  } else if (sp == "uint16") {
    *dt = DT_UINT16;
    return true;
  } else if (sp == "int16") {
    *dt = DT_INT16;
    return true;
  } else if (sp == "int8") {
    *dt = DT_INT8;
    return true;
  } else if (sp == "string") {
    *dt = DT_STRING;
    return true;
  } else if (sp == "complex64") {
    *dt = DT_COMPLEX64;
    return true;
  } else if (sp == "complex128") {
    *dt = DT_COMPLEX128;
    return true;
  } else if (sp == "int64") {
    *dt = DT_INT64;
    return true;
  } else if (sp == "bool") {
    *dt = DT_BOOL;
    return true;
  } else if (sp == "qint8") {
    *dt = DT_QINT8;
    return true;
  } else if (sp == "quint8") {
    *dt = DT_QUINT8;
    return true;
  } else if (sp == "qint16") {
    *dt = DT_QINT16;
    return true;
  } else if (sp == "quint16") {
    *dt = DT_QUINT16;
    return true;
  } else if (sp == "qint32") {
    *dt = DT_QINT32;
    return true;
  } else if (sp == "bfloat16") {
    *dt = DT_BFLOAT16;
    return true;
  } else if (sp == "half" || sp == "float16") {
    *dt = DT_HALF;
    return true;
  } else if (sp == "resource") {
    *dt = DT_RESOURCE;
    return true;
  }
  return false;
}

string DeviceTypeString(const DeviceType& device_type) {
  return device_type.type();
}

string DataTypeSliceString(const DataTypeSlice types) {
  string out;
  for (auto it = types.begin(); it != types.end(); ++it) {
    strings::StrAppend(&out, ((it == types.begin()) ? "" : ", "),
                       DataTypeString(*it));
  }
  return out;
}

DataTypeVector AllTypes() {
  return {DT_FLOAT,   DT_DOUBLE, DT_INT32,  DT_UINT8,     DT_INT16,
          DT_UINT16,  DT_INT8,   DT_STRING, DT_COMPLEX64, DT_COMPLEX128,
          DT_INT64,   DT_BOOL,   DT_QINT8,  DT_QUINT8,    DT_QINT16,
          DT_QUINT16, DT_QINT32, DT_HALF,   DT_RESOURCE};
}

#if !defined(IS_MOBILE_PLATFORM) || defined(SUPPORT_SELECTIVE_REGISTRATION)

DataTypeVector RealNumberTypes() {
  return {DT_FLOAT, DT_DOUBLE, DT_INT32,  DT_INT64, DT_UINT8,
          DT_INT16, DT_INT8,   DT_UINT16, DT_HALF};
}

DataTypeVector QuantizedTypes() {
  return {DT_QINT8, DT_QUINT8, DT_QINT16, DT_QUINT16, DT_QINT32};
}

DataTypeVector RealAndQuantizedTypes() {
  return {DT_FLOAT,  DT_DOUBLE,  DT_INT32,  DT_INT64, DT_UINT8,
          DT_UINT16, DT_UINT16,  DT_INT8,   DT_QINT8, DT_QUINT8,
          DT_QINT16, DT_QUINT16, DT_QINT32, DT_HALF};
}

DataTypeVector NumberTypes() {
  return {DT_FLOAT,  DT_DOUBLE, DT_INT64,  DT_INT32,     DT_UINT8,
          DT_UINT16, DT_INT16,  DT_INT8,   DT_COMPLEX64, DT_COMPLEX128,
          DT_QINT8,  DT_QUINT8, DT_QINT32, DT_HALF};
}

#elif defined(__ANDROID_TYPES_FULL__)

DataTypeVector RealNumberTypes() {
  return {DT_FLOAT, DT_INT32, DT_INT64, DT_HALF};
}

DataTypeVector NumberTypes() {
  return {DT_FLOAT,  DT_INT32,  DT_INT64, DT_QINT8,
          DT_QUINT8, DT_QINT32, DT_HALF};
}

DataTypeVector QuantizedTypes() {
  return {DT_QINT8, DT_QUINT8, DT_QINT16, DT_QUINT16, DT_QINT32};
}

DataTypeVector RealAndQuantizedTypes() {
  return {DT_FLOAT,  DT_INT32,   DT_INT64,  DT_QINT8, DT_QUINT8,
          DT_QINT16, DT_QUINT16, DT_QINT32, DT_HALF};
}

#else  // defined(IS_MOBILE_PLATFORM) && !defined(__ANDROID_TYPES_FULL__)

DataTypeVector RealNumberTypes() { return {DT_FLOAT, DT_INT32}; }

DataTypeVector NumberTypes() {
  return {DT_FLOAT, DT_INT32, DT_QINT8, DT_QUINT8, DT_QINT32};
}

DataTypeVector QuantizedTypes() {
  return {DT_QINT8, DT_QUINT8, DT_QINT16, DT_QUINT16, DT_QINT32};
}

DataTypeVector RealAndQuantizedTypes() {
  return {DT_FLOAT,  DT_INT32,   DT_QINT8, DT_QUINT8,
          DT_QINT16, DT_QUINT16, DT_QINT32};
}

#endif  // defined(IS_MOBILE_PLATFORM)

// TODO(jeff): Maybe unify this with Tensor::CanUseDMA, or the underlying
// is_simple<T> in tensor.cc (and possible choose a more general name?)
bool DataTypeCanUseMemcpy(DataType dt) {
  switch (dt) {
    case DT_FLOAT:
    case DT_DOUBLE:
    case DT_INT32:
    case DT_UINT8:
    case DT_UINT16:
    case DT_INT16:
    case DT_INT8:
    case DT_COMPLEX64:
    case DT_COMPLEX128:
    case DT_INT64:
    case DT_BOOL:
    case DT_QINT8:
    case DT_QUINT8:
    case DT_QINT16:
    case DT_QUINT16:
    case DT_QINT32:
    case DT_BFLOAT16:
    case DT_HALF:
      return true;
    default:
      return false;
  }
}

bool DataTypeIsQuantized(DataType dt) {
  switch (dt) {
    case DT_QINT8:
    case DT_QUINT8:
    case DT_QINT16:
    case DT_QUINT16:
    case DT_QINT32:
      return true;
    default:
      return false;
  }
}

bool DataTypeIsInteger(DataType dt) {
  switch (dt) {
    case DT_INT8:
    case DT_UINT8:
    case DT_INT16:
    case DT_UINT16:
    case DT_INT32:
    case DT_INT64:
      return true;
    default:
      return false;
  }
}

int DataTypeSize(DataType dt) {
#define CASE(T)                  \
  case DataTypeToEnum<T>::value: \
    return sizeof(T);
  switch (dt) {
    TF_CALL_POD_TYPES(CASE);
    TF_CALL_QUANTIZED_TYPES(CASE);
    // TF_CALL_QUANTIZED_TYPES() macro does no cover quint16 and qint16, since
    // they are not supported widely, but are explicitly listed here for
    // bitcast.
    TF_CALL_qint16(CASE);
    TF_CALL_quint16(CASE);
    default:
      return 0;
  }
#undef CASE
}

}  // namespace tensorflow
