# Copyright 2022 The MediaPipe Authors.
#
# 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.
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"""Base options for MediaPipe Task APIs."""

import dataclasses
import enum
from typing import Any, Optional

from mediapipe.tasks.python.core import base_options_c as base_options_c_lib
from mediapipe.tasks.python.core.optional_dependencies import doc_controls


@dataclasses.dataclass
class BaseOptions:
  """Base options for MediaPipe Tasks' Python APIs.

  Represents external model asset used by the Task APIs. The files can be
  specified by one of the following two ways:

  (1) model asset file path in `model_asset_path`.
  (2) model asset contents loaded in `model_asset_buffer`.

  If more than one field of these fields is provided, they are used in this
  precedence order.

  Attributes:
    model_asset_path: Path to the model asset file.
    model_asset_buffer: The model asset file contents as bytes.
    delegate: Acceleration to use. Supported values are GPU and CPU. GPU support
      is currently limited to Ubuntu platforms.
  """

  class Delegate(enum.IntEnum):
    CPU = 0
    GPU = 1

  model_asset_path: Optional[str] = None
  model_asset_buffer: Optional[bytes] = None
  delegate: Optional[Delegate] = None

  @doc_controls.do_not_generate_docs
  def to_ctypes(self) -> base_options_c_lib.BaseOptionsC:
    """Creates a BaseOptionsC struct from the BaseOptions object."""
    options = base_options_c_lib.BaseOptionsC()
    options.model_asset_buffer = self.model_asset_buffer
    options.model_asset_buffer_count = (
        len(self.model_asset_buffer) if self.model_asset_buffer else 0
    )
    options.model_asset_path = (
        self.model_asset_path.encode('utf-8') if self.model_asset_path else None
    )
    options.delegate = self.delegate.value if self.delegate else 0
    return options

  def __eq__(self, other: Any) -> bool:
    """Checks if this object is equal to the given object.

    Args:
      other: The object to be compared with.

    Returns:
      True if the objects are equal.
    """
    if not isinstance(other, BaseOptions):
      return False
    return (
        self.model_asset_path == other.model_asset_path
        and self.model_asset_buffer == other.model_asset_buffer
        and self.delegate == other.delegate
    )
