from __future__ import absolute_import, unicode_literals

import mock

import pytest

import responses

from mopidy import exceptions
from mopidy.audio import scan
from mopidy.stream import actor


TIMEOUT = 1000
PLAYLIST_URI = 'http://example.com/listen.m3u'
STREAM_URI = 'http://example.com/stream.mp3'
BODY = """
#EXTM3U
http://example.com/stream.mp3
http://foo.bar/baz
""".strip()


@pytest.fixture
def config():
    return {
        'proxy': {},
        'stream': {
            'timeout': TIMEOUT,
        },
    }


@pytest.fixture
def audio():
    return mock.Mock()


@pytest.fixture
def scanner():
    return mock.Mock(spec=scan.Scanner)


@pytest.fixture
def backend(scanner):
    backend = mock.Mock()
    backend.uri_schemes = ['file']
    backend._scanner = scanner
    return backend


@pytest.fixture
def provider(audio, backend, config):
    return actor.StreamPlaybackProvider(audio, backend, config)


class TestTranslateURI(object):

    @responses.activate
    def test_audio_stream_returns_same_uri(self, scanner, provider):
        scanner.scan.return_value.mime = 'audio/mpeg'

        result = provider.translate_uri(STREAM_URI)

        scanner.scan.assert_called_once_with(STREAM_URI, timeout=mock.ANY)
        assert result == STREAM_URI

    @responses.activate
    def test_text_playlist_with_mpeg_stream(
            self, scanner, provider, caplog):

        scanner.scan.side_effect = [
            mock.Mock(mime='text/foo'),  # scanning playlist
            mock.Mock(mime='audio/mpeg'),  # scanning stream
        ]
        responses.add(
            responses.GET, PLAYLIST_URI,
            body=BODY, content_type='audio/x-mpegurl')

        result = provider.translate_uri(PLAYLIST_URI)

        assert scanner.scan.mock_calls == [
            mock.call(PLAYLIST_URI, timeout=mock.ANY),
            mock.call(STREAM_URI, timeout=mock.ANY),
        ]
        assert result == STREAM_URI

        # Check logging to ensure debuggability
        assert 'Unwrapping stream from URI: %s' % PLAYLIST_URI
        assert 'Parsed playlist (%s)' % PLAYLIST_URI in caplog.text()
        assert 'Unwrapping stream from URI: %s' % STREAM_URI
        assert (
            'Unwrapped potential audio/mpeg stream: %s' % STREAM_URI
            in caplog.text())

        # Check proper Requests session setup
        assert responses.calls[0].request.headers['User-Agent'].startswith(
            'Mopidy-Stream/')

    @responses.activate
    def test_xml_playlist_with_mpeg_stream(self, scanner, provider):
        scanner.scan.side_effect = [
            mock.Mock(mime='application/xspf+xml'),  # scanning playlist
            mock.Mock(mime='audio/mpeg'),  # scanning stream
        ]
        responses.add(
            responses.GET, PLAYLIST_URI,
            body=BODY, content_type='application/xspf+xml')

        result = provider.translate_uri(PLAYLIST_URI)

        assert scanner.scan.mock_calls == [
            mock.call(PLAYLIST_URI, timeout=mock.ANY),
            mock.call(STREAM_URI, timeout=mock.ANY),
        ]
        assert result == STREAM_URI

    @responses.activate
    def test_scan_fails_but_playlist_parsing_succeeds(
            self, scanner, provider, caplog):

        scanner.scan.side_effect = [
            exceptions.ScannerError('some failure'),  # scanning playlist
            mock.Mock(mime='audio/mpeg'),  # scanning stream
        ]
        responses.add(
            responses.GET, PLAYLIST_URI,
            body=BODY, content_type='audio/x-mpegurl')

        result = provider.translate_uri(PLAYLIST_URI)

        assert 'Unwrapping stream from URI: %s' % PLAYLIST_URI
        assert (
            'GStreamer failed scanning URI (%s)' % PLAYLIST_URI
            in caplog.text())
        assert 'Parsed playlist (%s)' % PLAYLIST_URI in caplog.text()
        assert (
            'Unwrapped potential audio/mpeg stream: %s' % STREAM_URI
            in caplog.text())
        assert result == STREAM_URI

    @responses.activate
    def test_scan_fails_and_playlist_parsing_fails(
            self, scanner, provider, caplog):

        scanner.scan.side_effect = exceptions.ScannerError('some failure')
        responses.add(
            responses.GET, STREAM_URI,
            body=b'some audio data', content_type='audio/mpeg')

        result = provider.translate_uri(STREAM_URI)

        assert 'Unwrapping stream from URI: %s' % STREAM_URI
        assert (
            'GStreamer failed scanning URI (%s)' % STREAM_URI
            in caplog.text())
        assert (
            'Failed parsing URI (%s) as playlist; found potential stream.'
            % STREAM_URI in caplog.text())
        assert result == STREAM_URI

    def test_failed_download_returns_none(self, provider, caplog):
        with mock.patch.object(actor, 'http') as http_mock:
            http_mock.download.return_value = None

            result = provider.translate_uri(PLAYLIST_URI)

        assert result is None