"""test_feature_extractors_functional.py -- functional tests for feature extractors

This module contains functional tests for FEs using crafted and/or generated media files
to verify that the FEs are working as expected:

 - laughter detection -- uses videos with laughs at known times
 - video activity -- uses videos with visual activity at known times
 - audio loudness -- uses videos with audio at known times

etc.

These tests are marked slow to avoid running them during normal test runs.
"""

import unittest
import pipeline.feature_extractors as extractors
import test.mocks as mocks

class FEFunctionalTest(unittest.TestCase):
    """FEFunctionalTest -- base class for functional tests for feature extractors
    """
    SAMPLE_DIR = "/home/robert/code/softdev2023-24/summerproject/highlights/test/sample_videos"


class TestLaughterFEFunctional(FEFunctionalTest):
    """TestLaughterFEFunctional -- functional tests for laughter detection feature extractor"""

    def test_laughter_detection(self):
        """Test laughter detection feature extractor

        Uses:
            - sample_videos/sample-manual-audio-laughs-video-colours.mp4
              :: laughters at 15-20s
                 -- pass iff laughter features extracted in this range, *but*
                    NOTE: LaughFE subtracts from start time to capture what preceded the laughter
                    so we need to subtract this time (and adds a little after too)
                    FE 'exposes' these as _PREPEND_TIME and _APPEND_TIME
        """
        SAMPLE_VIDEO = f"{self.SAMPLE_DIR}/sample-manual-audio-laughs-video-colours.mp4"

        START_TIME = 15
        END_TIME = 20
        # create mock source with the video
        source = mocks.MockSource(path=SAMPLE_VIDEO)

        # create the feature extractor
        testfe = extractors.LaughterFeatureExtractor(input_files=[source])
        testfe.setup()
        testfe.run()
        testfe.teardown()

        # check if the feature was extracted:
        self.assertTrue(testfe.features)
        # check if the feature interval is within the expected range
        self.assertTrue(testfe.features[0].interval.start >= (START_TIME - testfe._PREPEND_TIME))
        self.assertTrue(testfe.features[0].interval.end <= (END_TIME + testfe._APPEND_TIME))


class TestVideoActivityFEFunctional(FEFunctionalTest):
    """TestVisualActivityFEFunctional -- functional tests for visual activity feature extractor
    """

    def test_visual_activity_functional(self):
        """Test visual activity feature extractor

        use:
         - sample_videos/sample-manual-visualactivity.mp4 :: activity at 15-20s -- pass if activity detected anywhere in this range
        """
        SAMPLE_VIDEO = f"{self.SAMPLE_DIR}/sample-manual-visualactivity.mp4"

        START_TIME = 15
        END_TIME = 20
        # create mock source with the video
        source = mocks.MockSource(path=SAMPLE_VIDEO)

        # create the feature extractor
        testfe = extractors.VideoActivityFeatureExtractor(input_files=[source])
        testfe.setup()
        testfe.run()
        testfe.teardown()

        # check if the feature was extracted:
        self.assertTrue(testfe.features)
        # check if the feature interval is within the expected range
        self.assertTrue(testfe.features[0].interval.start >= START_TIME)


class TestLoudAudioFEFunctional(FEFunctionalTest):
    """TestAudioLoudnessFEFunctional -- functional tests for audio loudness feature extractor
    """

    def test_audio_loudness_functional_one_feature(self):
        """Test audio loudness feature extractor

        use:
         - sample_videos/sample-manual-audio.mp4 :: audio at 15-20s -- pass if audio detected anywhere in this range
                                                                    -- peak at 16s - 18s, verify this is highest scoring
        """
        SAMPLE_VIDEO = f"{self.SAMPLE_DIR}/sample-manual-audio.mp4"

        START_TIME = 15
        END_TIME = 20
        PEAK_START = 16
        PEAK_END = 18
        # create mock source with the video
        source = mocks.MockSource(path=SAMPLE_VIDEO)

        # create the feature extractor
        testfe = extractors.LoudAudioFeatureExtractor(input_files=[source])
        testfe.setup()
        testfe.run()
        testfe.teardown()

        # check if the feature was extracted:
        self.assertTrue(testfe.features)
        # check if the feature interval is within the expected range
        self.assertTrue(testfe.features[0].interval.start >= START_TIME)

        # get sorted list of features based on feature.score
        sorted_features = sorted(testfe.features, key=lambda x: x.score, reverse=True)
        # check if the highest scoring feature is within the peak range
        self.assertTrue(sorted_features[0].interval.start >= PEAK_START)

    def test_audio_loudness_functional_no_features(self):
        """Test audio loudness feature extractor using a silent video. This should produce no features
        since "-inf" results from pyloudnorm are filtered out by the FE.

        Use:
         - sample_videos/sample-manual-audio-blank-video-colours.mp4
           :: silent video (30s)
              -- pass if no features extracted
        """
        SAMPLE_VIDEO = f"{self.SAMPLE_DIR}/sample-manual-audio-blank-video-colours.mp4"

        # create mock source with the video
        source = mocks.MockSource(path=SAMPLE_VIDEO)

        # create the feature extractor
        testfe = extractors.LoudAudioFeatureExtractor(input_files=[source])
        testfe.setup()
        testfe.run()
        testfe.teardown()

        # check if the feature was extracted:
        self.assertFalse(testfe.features)


if __name__ == "__main__":
    unittest.main()