# Copyright 2023 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.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Tests for interactive segmenter."""

import enum
import os

from absl.testing import absltest
from absl.testing import parameterized
import cv2
import numpy as np

from mediapipe.python._framework_bindings import image as image_module
from mediapipe.python._framework_bindings import image_frame
from mediapipe.tasks.python.components.containers import keypoint as keypoint_module
from mediapipe.tasks.python.components.containers import rect
from mediapipe.tasks.python.core import base_options as base_options_module
from mediapipe.tasks.python.test import test_utils
from mediapipe.tasks.python.vision import interactive_segmenter
from mediapipe.tasks.python.vision.core import image_processing_options as image_processing_options_module

InteractiveSegmenterResult = interactive_segmenter.InteractiveSegmenterResult
_BaseOptions = base_options_module.BaseOptions
_Image = image_module.Image
_ImageFormat = image_frame.ImageFormat
_NormalizedKeypoint = keypoint_module.NormalizedKeypoint
_Rect = rect.Rect
_InteractiveSegmenter = interactive_segmenter.InteractiveSegmenter
_InteractiveSegmenterOptions = interactive_segmenter.InteractiveSegmenterOptions
_RegionOfInterest = interactive_segmenter.RegionOfInterest
_Format = interactive_segmenter.RegionOfInterest.Format
_ImageProcessingOptions = image_processing_options_module.ImageProcessingOptions

_MODEL_FILE = 'ptm_512_hdt_ptm_woid.tflite'
_CATS_AND_DOGS = 'cats_and_dogs.jpg'
_CATS_AND_DOGS_MASK_DOG_1 = 'cats_and_dogs_mask_dog1.png'
_CATS_AND_DOGS_MASK_DOG_2 = 'cats_and_dogs_mask_dog2.png'
_MASK_MAGNIFICATION_FACTOR = 255
_MASK_SIMILARITY_THRESHOLD = 0.97
_TEST_DATA_DIR = 'mediapipe/tasks/testdata/vision'


def _calculate_soft_iou(m1, m2):
  intersection_sum = np.sum(m1 * m2)
  union_sum = np.sum(m1 * m1) + np.sum(m2 * m2) - intersection_sum

  if union_sum > 0:
    return intersection_sum / union_sum
  else:
    return 0


def _similar_to_float_mask(actual_mask, expected_mask, similarity_threshold):
  actual_mask = actual_mask.numpy_view()
  expected_mask = expected_mask.numpy_view() / 255.0

  return (
      actual_mask.shape == expected_mask.shape
      and _calculate_soft_iou(actual_mask, expected_mask) > similarity_threshold
  )


def _similar_to_uint8_mask(actual_mask, expected_mask, similarity_threshold):
  actual_mask_pixels = actual_mask.numpy_view().flatten()
  expected_mask_pixels = expected_mask.numpy_view().flatten()

  consistent_pixels = 0
  num_pixels = len(expected_mask_pixels)

  for index in range(num_pixels):
    consistent_pixels += (
        actual_mask_pixels[index] * _MASK_MAGNIFICATION_FACTOR
        == expected_mask_pixels[index]
    )

  return consistent_pixels / num_pixels >= similarity_threshold


class ModelFileType(enum.Enum):
  FILE_CONTENT = 1
  FILE_NAME = 2


class InteractiveSegmenterTest(parameterized.TestCase):

  def setUp(self):
    super().setUp()
    # Load the test input image.
    self.test_image = _Image.create_from_file(
        test_utils.get_test_data_path(
            os.path.join(_TEST_DATA_DIR, _CATS_AND_DOGS)
        )
    )
    # Loads ground truth segmentation file.
    self.test_seg_image = self._load_segmentation_mask(
        _CATS_AND_DOGS_MASK_DOG_1
    )
    self.model_path = test_utils.get_test_data_path(
        os.path.join(_TEST_DATA_DIR, _MODEL_FILE)
    )

  def _load_segmentation_mask(self, file_path: str):
    # Loads ground truth segmentation file.
    gt_segmentation_data = cv2.imread(
        test_utils.get_test_data_path(os.path.join(_TEST_DATA_DIR, file_path)),
        cv2.IMREAD_GRAYSCALE,
    )
    return _Image(_ImageFormat.GRAY8, gt_segmentation_data)

  def test_create_from_file_succeeds_with_valid_model_path(self):
    # Creates with default option and valid model file successfully.
    with _InteractiveSegmenter.create_from_model_path(
        self.model_path
    ) as segmenter:
      self.assertIsInstance(segmenter, _InteractiveSegmenter)

  def test_create_from_options_succeeds_with_valid_model_path(self):
    # Creates with options containing model file successfully.
    base_options = _BaseOptions(model_asset_path=self.model_path)
    options = _InteractiveSegmenterOptions(base_options=base_options)
    with _InteractiveSegmenter.create_from_options(options) as segmenter:
      self.assertIsInstance(segmenter, _InteractiveSegmenter)

  def test_create_from_options_fails_with_invalid_model_path(self):
    with self.assertRaisesRegex(
        RuntimeError, 'Unable to open file at /path/to/invalid/model.tflite'
    ):
      base_options = _BaseOptions(
          model_asset_path='/path/to/invalid/model.tflite'
      )
      options = _InteractiveSegmenterOptions(base_options=base_options)
      _InteractiveSegmenter.create_from_options(options)

  def test_create_from_options_succeeds_with_valid_model_content(self):
    # Creates with options containing model content successfully.
    with open(self.model_path, 'rb') as f:
      base_options = _BaseOptions(model_asset_buffer=f.read())
      options = _InteractiveSegmenterOptions(base_options=base_options)
      segmenter = _InteractiveSegmenter.create_from_options(options)
      self.assertIsInstance(segmenter, _InteractiveSegmenter)

  @parameterized.parameters(
      (
          ModelFileType.FILE_NAME,
          _RegionOfInterest.Format.KEYPOINT,
          _NormalizedKeypoint(0.44, 0.7),
          _CATS_AND_DOGS_MASK_DOG_1,
          0.84,
      ),
      (
          ModelFileType.FILE_CONTENT,
          _RegionOfInterest.Format.KEYPOINT,
          _NormalizedKeypoint(0.44, 0.7),
          _CATS_AND_DOGS_MASK_DOG_1,
          0.84,
      ),
      (
          ModelFileType.FILE_NAME,
          _RegionOfInterest.Format.KEYPOINT,
          _NormalizedKeypoint(0.66, 0.66),
          _CATS_AND_DOGS_MASK_DOG_2,
          _MASK_SIMILARITY_THRESHOLD,
      ),
      (
          ModelFileType.FILE_CONTENT,
          _RegionOfInterest.Format.KEYPOINT,
          _NormalizedKeypoint(0.66, 0.66),
          _CATS_AND_DOGS_MASK_DOG_2,
          _MASK_SIMILARITY_THRESHOLD,
      ),
  )
  def test_segment_succeeds_with_category_mask(
      self,
      model_file_type,
      roi_format,
      keypoint,
      output_mask,
      similarity_threshold,
  ):
    # Creates segmenter.
    if model_file_type is ModelFileType.FILE_NAME:
      base_options = _BaseOptions(model_asset_path=self.model_path)
    elif model_file_type is ModelFileType.FILE_CONTENT:
      with open(self.model_path, 'rb') as f:
        model_content = f.read()
      base_options = _BaseOptions(model_asset_buffer=model_content)
    else:
      # Should never happen
      raise ValueError('model_file_type is invalid.')

    options = _InteractiveSegmenterOptions(
        base_options=base_options,
        output_category_mask=True,
        output_confidence_masks=False,
    )
    segmenter = _InteractiveSegmenter.create_from_options(options)

    # Performs image segmentation on the input.
    roi = _RegionOfInterest(format=roi_format, keypoint=keypoint)
    segmentation_result = segmenter.segment(self.test_image, roi)
    category_mask = segmentation_result.category_mask
    result_pixels = category_mask.numpy_view().flatten()

    # Check if data type of `category_mask` is correct.
    self.assertEqual(result_pixels.dtype, np.uint8)

    # Loads ground truth segmentation file.
    test_seg_image = self._load_segmentation_mask(output_mask)

    self.assertTrue(
        _similar_to_uint8_mask(
            category_mask, test_seg_image, similarity_threshold
        ),
        (
            'Number of pixels in the candidate mask differing from that of the'
            f' ground truth mask exceeds {similarity_threshold}.'
        ),
    )

    # Closes the segmenter explicitly when the segmenter is not used in
    # a context.
    segmenter.close()

  @parameterized.parameters(
      (
          _RegionOfInterest.Format.KEYPOINT,
          _NormalizedKeypoint(0.44, 0.7),
          _CATS_AND_DOGS_MASK_DOG_1,
          0.84,
      ),
      (
          _RegionOfInterest.Format.KEYPOINT,
          _NormalizedKeypoint(0.66, 0.66),
          _CATS_AND_DOGS_MASK_DOG_2,
          _MASK_SIMILARITY_THRESHOLD,
      ),
  )
  def test_segment_succeeds_with_confidence_mask(
      self, roi_format, keypoint, output_mask, similarity_threshold
  ):
    # Creates segmenter.
    base_options = _BaseOptions(model_asset_path=self.model_path)
    roi = _RegionOfInterest(format=roi_format, keypoint=keypoint)

    # Run segmentation on the model in CONFIDENCE_MASK mode.
    options = _InteractiveSegmenterOptions(
        base_options=base_options,
        output_category_mask=False,
        output_confidence_masks=True,
    )

    with _InteractiveSegmenter.create_from_options(options) as segmenter:
      # Perform segmentation
      segmentation_result = segmenter.segment(self.test_image, roi)
      confidence_masks = segmentation_result.confidence_masks

      # Check if confidence mask shape is correct.
      self.assertLen(
          confidence_masks,
          2,
          'Number of confidence masks must match with number of categories.',
      )

      # Loads ground truth segmentation file.
      expected_mask = self._load_segmentation_mask(output_mask)

      self.assertTrue(
          _similar_to_float_mask(
              confidence_masks[1], expected_mask, similarity_threshold
          )
      )

  def test_segment_succeeds_with_rotation(self):
    # Creates segmenter.
    base_options = _BaseOptions(model_asset_path=self.model_path)
    roi = _RegionOfInterest(
        format=_RegionOfInterest.Format.KEYPOINT,
        keypoint=_NormalizedKeypoint(0.66, 0.66),
    )

    # Run segmentation on the model in CONFIDENCE_MASK mode.
    options = _InteractiveSegmenterOptions(
        base_options=base_options,
        output_category_mask=False,
        output_confidence_masks=True,
    )

    with _InteractiveSegmenter.create_from_options(options) as segmenter:
      # Perform segmentation
      image_processing_options = _ImageProcessingOptions(rotation_degrees=-90)
      segmentation_result = segmenter.segment(
          self.test_image, roi, image_processing_options
      )
      confidence_masks = segmentation_result.confidence_masks

      # Check if confidence mask shape is correct.
      self.assertLen(
          confidence_masks,
          2,
          'Number of confidence masks must match with number of categories.',
      )

  def test_segment_fails_with_roi_in_image_processing_options(self):
    # Creates segmenter.
    base_options = _BaseOptions(model_asset_path=self.model_path)
    roi = _RegionOfInterest(
        format=_RegionOfInterest.Format.KEYPOINT,
        keypoint=_NormalizedKeypoint(0.66, 0.66),
    )

    # Run segmentation on the model in CONFIDENCE_MASK mode.
    options = _InteractiveSegmenterOptions(
        base_options=base_options,
        output_category_mask=False,
        output_confidence_masks=True,
    )

    with self.assertRaisesRegex(
        ValueError, "This task doesn't support region-of-interest."
    ):
      with _InteractiveSegmenter.create_from_options(options) as segmenter:
        # Perform segmentation
        image_processing_options = _ImageProcessingOptions(
            _Rect(left=0.1, top=0, right=0.9, bottom=1)
        )
        segmenter.segment(self.test_image, roi, image_processing_options)


if __name__ == '__main__':
  absltest.main()