import json
import pathlib
import shutil
from http import HTTPStatus
from itertools import zip_longest
from typing import List
from uuid import uuid4

import mock
import pytest
from PIL import Image

from modules.videos.downloader import VideoDownloader, ChannelDownloader
from modules.videos.lib import set_test_channels_config, set_test_downloader_config
from modules.videos.models import Channel, Video
from wrolpi.api_utils import api_app
from wrolpi.downloader import DownloadFrequency, DownloadManager
from wrolpi.files.models import FileGroup
from wrolpi.vars import PROJECT_DIR


@pytest.fixture
def simple_channel(test_session, test_directory) -> Channel:
    """Get a Channel with the minimum properties.  This Channel has no download!"""
    channel = Channel(
        directory=test_directory,
        name='Simple Channel',
        url='https://example.com/channel1',
    )
    test_session.add(channel)
    test_session.commit()
    return channel


@pytest.fixture
def channel_factory(test_session, test_directory):
    """Create a random Channel with a directory, ChannelDownload, and Download."""

    def factory(source_id: str = None, download_frequency: DownloadFrequency = None, url: str = None, name: str = None,
                directory: pathlib.Path = None):
        name = name or str(uuid4())
        directory = directory or test_directory / name
        if not directory.is_dir():
            directory.mkdir()
        channel = Channel(
            directory=directory,  # noqa
            name=name,
            url=url or f'https://example.com/{name}',
            source_id=source_id,
        )
        test_session.add(channel)
        test_session.flush([channel])
        assert channel.id and channel.url
        if download_frequency:
            cd = channel.get_or_create_download(channel.url)
            cd.download.frequency = download_frequency
            assert cd and cd.download_url == channel.url
            assert channel.channel_downloads
        test_session.commit()
        return channel

    return factory


@pytest.fixture
def download_channel(test_session, test_directory, video_download_manager) -> Channel:
    """Get a test Channel that has a download frequency."""
    # Add a frequency to the test channel, then give it a download.
    channel = Channel(directory=test_directory, name='Download Channel', url='https://example.com/channel1',
                      source_id='channel1')
    test_session.add(channel)
    test_session.flush([channel, ])
    assert channel and channel.id and channel.url
    cd = channel.get_or_create_download(channel.url, test_session)
    assert cd.download_url == channel.url
    cd.download.frequency = DownloadFrequency.weekly
    test_session.commit()
    return channel


@pytest.fixture
def simple_video(test_session, test_directory, simple_channel, video_file) -> Video:
    """A Video with a video file, the channel is `simple_channel`."""
    video_path = test_directory / 'simple_video.mp4'
    video_file.rename(video_path)
    video = Video.from_paths(test_session, video_path)
    video.channel = simple_channel
    test_session.commit()
    video = Video.find_by_id(video.id, session=test_session)
    return video


@pytest.fixture
def video_factory(test_session, test_directory):
    """Creates Videos for testing."""

    def factory(channel_id: int = None, title: str = None, upload_date=None, with_video_file=None,
                with_info_json: dict = None, with_poster_ext: str = None, with_caption_file: bool = False,
                source_id: str = None, tag_names: List[str] = None) -> Video:
        title = title or str(uuid4())
        tag_names = tag_names or list()

        if with_video_file and isinstance(with_video_file, (pathlib.Path, str)):
            # Put the video exactly where specified for the test.
            path = pathlib.Path(with_video_file) if not isinstance(with_video_file, pathlib.Path) else with_video_file
        elif channel_id:
            # Put the video in its Channel's directory.
            channel = test_session.query(Channel).filter_by(id=channel_id).one()
            path = (channel.directory or test_directory) / f'{title}.mp4'
        else:
            # Put any video not in a Channel and without a specified file in the NO CHANNEL directory.
            (test_directory / 'videos/NO CHANNEL').mkdir(exist_ok=True, parents=True)
            path = test_directory / f'videos/NO CHANNEL/{title}.mp4'

        # Create a real video file for mimetype.
        shutil.copy(PROJECT_DIR / 'test/big_buck_bunny_720p_1mb.mp4', path)

        info_json_path = None
        if with_info_json:
            # Use the provided object as the json.
            with_info_json = {'duration': 5, 'epoch': 12345678} if with_info_json is True else with_info_json
            info_json_path = path.with_suffix('.info.json')
            info_json_path.write_text(json.dumps(with_info_json))

        poster_path = None
        if with_poster_ext:
            poster_path = path.with_suffix(f'.{with_poster_ext.lstrip(".")}')
            Image.new('RGB', (25, 25)).save(poster_path)

        caption_path = None
        if with_caption_file:
            caption_path = path.with_suffix('.en.vtt')
            shutil.copy(PROJECT_DIR / 'test/example1.en.vtt', caption_path)

        paths = (path, info_json_path, poster_path, caption_path)
        paths = list(filter(None, paths))

        video = Video.from_paths(test_session, *paths)
        video.channel_id = channel_id
        video.source_id = source_id or title
        video.file_group.published_datetime = upload_date
        video.validate()

        for tag_name in tag_names:
            video.add_tag(tag_name)

        return video

    return factory


@pytest.fixture
def video_download_manager(test_download_manager) -> DownloadManager:
    """Get a DownloadManager ready to download Videos and Channels."""
    channel_downloader = ChannelDownloader()
    video_downloader = VideoDownloader()

    test_download_manager.register_downloader(channel_downloader)
    test_download_manager.register_downloader(video_downloader)

    with mock.patch('modules.videos.downloader.YDL.extract_info') as mock_extract_info:  # prevent real downloads
        mock_extract_info.side_effect = Exception('You must patch modules.videos.downloader.YDL.extract_info!')
        yield test_download_manager


@pytest.fixture
def test_channels_config(test_directory):
    (test_directory / 'config').mkdir(exist_ok=True)
    config_path = test_directory / 'config/channels.yaml'
    with set_test_channels_config() as config:
        config.initialize(api_app.shared_ctx.channels_config)
        yield config_path


@pytest.fixture
def test_downloader_config(test_directory):
    (test_directory / 'config').mkdir(exist_ok=True)
    config_path = test_directory / 'config/downloader.yaml'
    set_test_downloader_config(True)
    yield config_path
    set_test_downloader_config(False)


@pytest.fixture
def mock_video_extract_info():
    with mock.patch('modules.videos.downloader.extract_info') as mock_extract_info:
        # Add some simple data so the function can be called.
        mock_extract_info.return_value = dict(
            entries=[],
            uploader='mock_video_extract_info',
            id='mock_video_extract_info',
        )
        yield mock_extract_info


@pytest.fixture
def mock_video_prepare_filename():
    with mock.patch('modules.videos.downloader.prepare_filename') as mock_prepare_filename:
        yield mock_prepare_filename


@pytest.fixture
def mock_video_process_runner():
    with mock.patch('modules.videos.downloader.VideoDownloader.process_runner') as mock_process_runner:
        mock_process_runner.return_value = (0, {'stdout': None, 'stderr': None}, None)
        yield mock_process_runner


@pytest.fixture
def assert_video_ids(test_session):
    """Check that only the expected Videos are in the DB."""

    def checker(expected_video_ids: List[int]):
        video_ids = [i.id for i in test_session.query(Video).order_by(Video.id)]
        for id_, expected in zip_longest(video_ids, expected_video_ids):
            assert id_ == expected, f'Video ids were not as expected: {expected_video_ids=} != {video_ids=}'

    return checker


@pytest.fixture
def video_with_search_factory(test_session, test_directory, video_file_factory):
    """A factory that creates a Video record with an associated video File record."""

    def video_with_search(path: str = None, title: str = None, b_text: str = None, c_text: str = None,
                          d_text: str = None, mimetype: str = 'video/mp4'):
        video_file_group = FileGroup.from_paths(test_session, video_file_factory(path))
        video_file_group.a_text = title
        video_file_group.b_text = b_text
        video_file_group.c_text = c_text
        video_file_group.d_text = d_text
        video_file_group.mimetype = mimetype
        video_file_group.model = 'video'
        video = Video(file_group=video_file_group)
        test_session.add(video)
        return video

    return video_with_search


@pytest.fixture
def assert_video_search(test_client):
    """A fixture which performs a video search request against the API.

    If assert_* params are passed, the response is checked."""

    def _search_videos(
            assert_total: int = None,
            assert_ids: List[int] = None,
            assert_paths: List[str] = None,
            search_str: str = None,
            tag_names: List[str] = None,
            offset: int = None,
            limit: int = None,
            order_by: str = None,
            channel_id: int = None,
    ):
        content = dict()
        if search_str is not None:
            content['search_str'] = search_str
        if tag_names is not None:
            content['tag_names'] = tag_names
        if offset is not None:
            content['offset'] = offset
        if limit is not None:
            content['limit'] = limit
        if order_by is not None:
            content['order_by'] = order_by
        if channel_id is not None:
            content['channel_id'] = channel_id

        request, response = test_client.post('/api/videos/search', content=json.dumps(content))

        assert response.json
        assert response.status_code == HTTPStatus.OK

        if assert_ids is not None:
            assert 'file_groups' in response.json, 'No video file_groups in response'
            assert [i['id'] for i in response.json['file_groups']] == assert_ids, 'Video IDs do not match'

        if assert_paths is not None:
            assert 'file_groups' in response.json, 'No video file_groups in response'
            assert [i['primary_path'] for i in response.json['file_groups']] == assert_paths, 'Video paths do not match'

        if assert_total and not (count := response.json['totals']['file_groups']) == int(assert_total):
            raise AssertionError(f'Video count does not match: {count} != {assert_total}')

        return request, response

    return _search_videos