"""Test cases for utils"""
import unittest

import pipeline.utils as utils


class TestSource(unittest.TestCase):
    """Source is a container for source, path, and provider of a media file

    source -- the source of the media file (eg, a URL or a local path)
    path -- the path to the media file
    provider -- the provider of the media file (eg, "FileInputJSON")

    Accessing the object should return the path to the media file.

    Methods:

    duration() -- return the duration of the media file (uses ffprobe, result is cached)
    """
    # Happy path tests
    def setUp(self):
        self.source = "audio_clips/testclip-5min.aac"
        self.path = "audio_clips/testclip-5min.aac"
        self.provider = "FileInputJSON"
        self._duration = 306.121214 # duration of testclip-5min.aac

    def test_init(self):
        source = utils.Source(self.source, self.path, self.provider)
        self.assertEqual(source.source, self.source)
        self.assertEqual(source.path, self.path)
        self.assertEqual(source.provider, self.provider)

    def test_str(self):
        """Accessing the object should return the path to the media file"""
        source = utils.Source(self.source, self.path, self.provider)
        self.assertEqual(str(source), self.path)

    def test_repr(self):
        source = utils.Source(self.source, self.path, self.provider)
        self.assertEqual(repr(source), f"Source({self.source}, {self.path}, {self.provider})")

    def test_duration(self):
        """Use a mock duration of 306.121214 for the test clip"""
        source = utils.Source(self.source, self.path, self.provider)
        self.assertEqual(source.duration(), self._duration)

    def test_to_json(self):
        source = utils.Source(self.source, self.path, self.provider)
        self.assertEqual(source.to_json(), {"source": self.source, "path": self.path, "provider": self.provider})

    # Sad path tests
    def test_init_no_source(self):
        with self.assertRaises(ValueError):
            utils.Source("", self.path, self.provider)

    def test_init_no_path(self):
        with self.assertRaises(ValueError):
            utils.Source(self.source, "", self.provider)

    def test_init_no_provider(self):
        with self.assertRaises(ValueError):
            utils.Source(self.source, self.path, "")

    def test_duration_no_file(self):
        """Test that duration raises FileNotFoundError if the file does not exist"""
        source = utils.Source(self.source, "fakepath-noexist!😇", self.provider)
        # if that file actually exists I'll eat my hat
        with self.assertRaises(FileNotFoundError):
            source.duration()


class TestSourceMedia(unittest.TestCase):
    """SourceMedia is a container for Source objects"""
    class FakeSource():
        """Fake source object for testing SourceMedia

         Since SourceMedia doesn't actually access any of the attributes of Source objects,
         we can use a very empty class for testing.
         """

    def setUp(self):
        self.source1 = self.FakeSource()
        self.source2 = self.FakeSource()
        self.source3 = self.FakeSource()
        self.sources = [self.source1, self.source2, self.source3]

    def test_init(self):
        source_media = utils.SourceMedia(sources=self.sources)
        self.assertEqual(source_media.sources, self.sources)

    def test_iter(self):
        source_media = utils.SourceMedia(sources=self.sources)
        self.assertEqual(list(source_media), self.sources)


class TestInterval(unittest.TestCase):
    """Interval is a container for start, end and duration attributes"""
    def setUp(self):
        self.start = 0
        self.end = 10
        self.duration = 10

    # Happy path tests

    def test_init_start_end(self):
        """Create an Interval using start and end attributes"""
        interval = utils.Interval(start=self.start, end=self.end)
        self.assertEqual(interval.start, self.start)
        self.assertEqual(interval.end, self.end)
        self.assertEqual(interval.duration, self.duration)

    def test_init_start_duration(self):
        """Create an Interval using start and duration attributes"""
        interval = utils.Interval(start=self.start, duration=self.duration)
        self.assertEqual(interval.start, self.start)
        self.assertEqual(interval.end, self.end)
        self.assertEqual(interval.duration, self.duration)

    def test_init_end_duration(self):
        """Create an Interval using end and duration attributes"""
        interval = utils.Interval(end=self.end, duration=self.duration)
        self.assertEqual(interval.start, self.start)
        self.assertEqual(interval.end, self.end)
        self.assertEqual(interval.duration, self.duration)

    def test_from_start_classmethod(self):
        """Create an Interval using the from_start classmethod (ie start attribute only- uses default duration)"""
        interval = utils.Interval.from_start(start=self.start)
        self.assertEqual(interval.start, self.start)
        self.assertEqual(interval.end, interval.start + utils.Interval.DEFAULT_DURATION)
        self.assertEqual(interval.duration, utils.Interval.DEFAULT_DURATION)

    def test_from_end_classmethod(self):
        """Create an Interval using the from_end classmethod (ie end attribute only- uses default duration)"""
        interval = utils.Interval.from_end(end=self.end)
        self.assertEqual(interval.start, interval.end - utils.Interval.DEFAULT_DURATION)
        self.assertEqual(interval.end, self.end)
        self.assertEqual(interval.duration, utils.Interval.DEFAULT_DURATION)

    def test_repr(self):
        interval = utils.Interval(start=self.start, end=self.end)
        self.assertEqual(repr(interval), f"Interval({self.start}, {self.end}, {self.duration})")

    def test_lt(self):
        """Test the __lt__ method used for sorting Interval objects based on start time

        If the start times are equal, the interval with the smaller end time is considered smaller
        """
        interval1 = utils.Interval(start=0, end=10)
        interval2 = utils.Interval(start=0, end=15)
        interval3 = utils.Interval(start=5, end=10)
        interval4 = utils.Interval(start=5, end=15)
        self.assertTrue(interval1 < interval2) # same start, interval1 has smaller end
        self.assertTrue(interval1 < interval3) # interval1 start is smaller
        self.assertTrue(interval3 > interval2) # interval3 start is larger
        self.assertTrue(interval3 < interval4) # same start, interval3 has smaller end

    def test_to_json(self):
        """Test to_json method"""
        interval = utils.Interval(start=self.start, end=self.end)
        self.assertEqual(interval.to_json(), {"start": self.start, "end": self.end, "duration": self.duration})

    def test_move_start(self):
        """Test the move_start method - changes start time to time specified, keeps end time constant"""
        interval = utils.Interval(start=self.start, end=self.end)
        interval.move_start(5)
        self.assertEqual(interval.start, 5)
        self.assertEqual(interval.end, 10)
        self.assertEqual(interval.duration, 5)

    def test_move_start_relative(self):
        """Test the move_start method with relative=True - changes start time by a relative amount"""
        interval = utils.Interval(start=self.start, end=self.end)
        interval.move_start(2, relative=True)
        self.assertEqual(interval.start, 2)
        self.assertEqual(interval.end, 10)
        self.assertEqual(interval.duration, 8)

    def test_move_end(self):
        """Test the move_end method - changes end time to time specified, keeps start time constant"""
        interval = utils.Interval(start=self.start, end=self.end)
        interval.move_end(15)
        self.assertEqual(interval.start, 0)
        self.assertEqual(interval.end, 15)
        self.assertEqual(interval.duration, 15)

    def test_update_duration(self):
        """Test the update_duration method - changes duration to time specified, keeps start time constant"""
        interval = utils.Interval(start=self.start, end=self.end)
        interval.update_duration(15)
        self.assertEqual(interval.start, 0)
        self.assertEqual(interval.end, 15)
        self.assertEqual(interval.duration, 15)
        # test with relative=True
        interval.update_duration(5, relative=True)
        self.assertEqual(interval.start, 0)

    # Unhappy path tests

    def test_init_no_start_end(self):
        with self.assertRaises(ValueError):
            utils.Interval()

    def test_init_start_end_duration(self):
        with self.assertRaises(ValueError):
            utils.Interval(start=self.start, end=self.end, duration=self.duration)

    def test_init_start_after_end(self):
        with self.assertRaises(ValueError):
            utils.Interval(start=10, end=0)

    def test_init_negative_duration(self):
        with self.assertRaises(ValueError):
            utils.Interval(start=0, duration=-10)
        with self.assertRaises(ValueError):
            utils.Interval(end=0, duration=-10)


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