"""test_producers.py -- test the producers in the pipeline (eg ffmpeg, visualisation, json)"""
import unittest
import pipeline.video_producers as producers
import test.mocks as mocks


class TestFfmpegVideoProducer(unittest.TestCase):
    """Test FfmpegVideoProducer (produces videos using ffmpeg)"""

    def mock_run_no_output(self, cmd, cwd="."):
        """Mock out _run_no_output"""
        return None

    def test_init_empty(self):
        # test with no features -- should raise ValueError
        with self.assertRaises(ValueError):
            producers.FfmpegVideoProducer(features=None)

    def test_init(self):
        # test with features
        feature = mocks.MockFeature(interval="")
        features = [feature]
        vidprod = producers.FfmpegVideoProducer(features=features)
        self.assertEqual(vidprod.features, features)

    def test_ffmpeg_feature_to_clip(self):
        """Test without a feature and without output path -- unhappy path"""
        feature = mocks.MockFeature(interval=mocks.MockInterval(start=0, end=5),
                              source=mocks.MockSource(path="test.mp4"))
        features = [feature]
        vidprod = producers.FfmpegVideoProducer(features=features)
        with self.assertRaises(ValueError):
            vidprod._ffmpeg_feature_to_clip(feature=None)
        with self.assertRaises(ValueError):
            vidprod._ffmpeg_feature_to_clip(feature=feature, output_filepath=None)

    def test_ffmpeg_concat_clips(self):
        """Test without clips and without output path -- unhappy path"""
        feature = mocks.MockFeature(interval="")
        features = [feature]
        vidprod = producers.FfmpegVideoProducer(features=features)
        with self.assertRaises(ValueError):
            vidprod._ffmpeg_concat_clips(clips=None)
        with self.assertRaises(ValueError):
            vidprod._ffmpeg_concat_clips(clips=features, output_filepath=None)

    # happy path
    def test_produce(self):
        """Test we can call produce without error"""
        feature = mocks.MockFeature(interval=mocks.MockInterval(start=0, end=5),
                              source=mocks.MockSource(path="test.mp4"))
        features = [feature]
        vidprod = producers.FfmpegVideoProducer(features=features)
        vidprod.produce()

class TestVisualisationProducer(unittest.TestCase):
    """Test VisualisationProducer (produces matplotlib visualisations)"""

    def test_init_empty(self):
        # test with no features -- should raise ValueError
        with self.assertRaises(ValueError):
            producers.VisualisationProducer(features=None)

    def test_init(self):
        # test with features
        feature = mocks.MockFeature(interval="")
        features = [feature]
        visprod = producers.VisualisationProducer(features=features)
        self.assertEqual(visprod.features, features)

    def test_produce(self):
        """Test we can call produce without error"""
        # to do this, we need to mock out plt.savefig(path)
        feature = mocks.MockFeature(interval=mocks.MockInterval(start=0, end=5),
                                    source=mocks.MockSource(path="test.mp4"))
        features = [feature]
        visprod = producers.VisualisationProducer(features=features)
        with unittest.mock.patch("matplotlib.pyplot.savefig") as mock_savefig:
            visprod.produce()
            mock_savefig.assert_called()

        # TODO: more more granular test coverage of produce behaviour

class TestJSONProducer(unittest.TestCase):
    def test_init_empty(self):
        # test with no features -- should raise ValueError
        with self.assertRaises(ValueError):
            producers.JSONProducer(features=None)

    def test_init(self):
        # test with features
        feature = mocks.MockFeature(interval="")
        features = [feature]
        jsonprod = producers.JSONProducer(features=features)
        self.assertEqual(jsonprod.features, features)

    def test_produce(self):
        """Test we can call produce without error"""
        feature = mocks.MockFeature(interval="")
        features = [feature]
        jsonprod = producers.JSONProducer(features=features)
        jsonprod.produce()

class TestPipelineJSONEncoder(unittest.TestCase):
    """Test PipelineJSONEncoder"""
    # unhappy path

    def test_default_unserializable(self):
        pje = producers.PipelineJSONEncoder()
        with self.assertRaises(TypeError):
            pje.default(object())