"""Unit tests for module-level helpers in unshackle.core.remote_service."""

from __future__ import annotations

from enum import Enum

import pytest

from unshackle.core.api.handlers import serialize_audio_track, serialize_subtitle_track, serialize_video_track
from unshackle.core.manifests.snapshot import match_track
from unshackle.core.remote_service import (
    RemoteService,
    build_title,
    build_tracks,
    deserialize_audio,
    deserialize_subtitle,
    deserialize_video,
    enum_get,
    reconstruct_drm,
)
from unshackle.core.titles.episode import Episode
from unshackle.core.titles.movie import Movie
from unshackle.core.tracks import Audio, Subtitle, Video

pytestmark = pytest.mark.unit


class _Color(Enum):
    RED = 1
    BLUE = 2


def test_enum_get_known() -> None:
    assert enum_get(_Color, "RED") is _Color.RED


def test_enum_get_unknown_returns_default() -> None:
    assert enum_get(_Color, "PURPLE", default=_Color.BLUE) is _Color.BLUE


def test_enum_get_none_returns_default() -> None:
    assert enum_get(_Color, None, default=_Color.RED) is _Color.RED


def test_deserialize_video_minimal() -> None:
    v = deserialize_video({"id": "video-1", "codec": "AVC", "width": 1920, "height": 1080, "bitrate": 5000})
    assert isinstance(v, Video)
    assert v.id == "video-1"
    assert v.codec is Video.Codec.AVC
    assert v.bitrate == 5_000_000  # kbps -> bps
    assert v.width == 1920
    assert v.height == 1080
    assert v.range is Video.Range.SDR


def test_a_dv_track_keeps_its_hdr10_base_label_over_remote() -> None:
    v = Video(url="https://x/v.mp4", language="en", codec=Video.Codec.HEVC, range_=Video.Range.DV, hdr10_base=True)
    assert deserialize_video(serialize_video_track(v)).range_label == "DV+HDR10"


def test_a_track_note_shows_over_remote_and_export_and_is_not_an_edition() -> None:
    from unshackle.core.tracks.track import Track

    v = Video(url="https://x/v.mp4", language="ja", codec=Video.Codec.AVC, note="h264mpl40-dash")
    a = Audio(url="https://x/a.mp4", language="ja", codec=Audio.Codec.AAC, note="heaac-2-dash")
    s = Subtitle(url="https://x/s.vtt", language="en", codec=Subtitle.Codec.WebVTT, note="webvtt-lssdh")
    copies = [deserialize_video(serialize_video_track(v)), deserialize_audio(serialize_audio_track(a))]
    copies += [deserialize_subtitle(serialize_subtitle_track(s))]
    copies += [Track.from_dict(t.to_dict()) for t in (v, a, s)]
    for copy in copies:
        assert copy.note and str(copy).endswith(f"| {copy.note}")
        assert copy.edition == []


def test_a_note_that_is_not_text_is_dropped_not_fatal() -> None:
    assert deserialize_video({"id": "v1", "codec": "AVC", "width": 1, "height": 1, "note": {"x": 1}}).note is None


def test_deserialize_video_unknown_codec_falls_back_to_none() -> None:
    v = deserialize_video({"id": "v2", "codec": "MADE_UP", "width": 0, "height": 0})
    assert v.codec is None


def test_deserialize_audio_atmos_flag_without_a_count() -> None:
    a = deserialize_audio({"id": "a1", "codec": "AAC", "atmos": True, "channels": 6, "bitrate": 256})
    assert isinstance(a, Audio)
    assert a.atmos is True
    assert a.joc is None
    assert a.channels == 6
    assert a.bitrate == 256_000


def test_deserialize_audio_atmos_keeps_a_real_joc_count() -> None:
    a = deserialize_audio({"id": "a3", "codec": "EC3", "atmos": True, "joc": 16, "channels": 6})
    assert a.atmos is True
    assert a.joc == 16


def test_deserialize_audio_no_atmos() -> None:
    a = deserialize_audio({"id": "a2", "codec": "AAC", "channels": 2})
    assert a.atmos is False
    assert not a.joc


def test_deserialize_subtitle_forced_flag() -> None:
    s = deserialize_subtitle({"id": "s1", "codec": "WebVTT", "language": "en", "forced": True})
    assert isinstance(s, Subtitle)
    assert s.forced is True
    assert s.sdh is False


def test_deserialize_subtitle_sdh_flag() -> None:
    s = deserialize_subtitle({"id": "s2", "codec": "WebVTT", "language": "en", "sdh": True})
    assert s.sdh is True
    assert s.forced is False


def test_reconstruct_drm_empty() -> None:
    assert reconstruct_drm(None) == []
    assert reconstruct_drm([]) == []


def test_reconstruct_drm_skips_entries_without_pssh() -> None:
    assert reconstruct_drm([{"type": "widevine"}]) == []


def test_reconstruct_drm_invalid_pssh_silently_dropped() -> None:
    assert reconstruct_drm([{"type": "widevine", "pssh": "not-real-pssh"}]) == []


def test_build_tracks_aggregates() -> None:
    data = {
        "video": [{"id": "v", "codec": "AVC", "width": 1280, "height": 720, "bitrate": 2500}],
        "audio": [{"id": "a", "codec": "AAC", "channels": 2, "bitrate": 128}],
        "subtitles": [{"id": "s", "codec": "WebVTT", "language": "en"}],
        "attachments": [],
    }
    t = build_tracks(data)
    assert len(t.videos) == 1
    assert len(t.audio) == 1
    assert len(t.subtitles) == 1


def test_build_tracks_restores_drm_preference() -> None:
    data = {
        "video": [{"id": "v", "codec": "AVC", "width": 1280, "height": 720, "drm_preference": "playready"}],
        "audio": [{"id": "a", "codec": "AAC", "channels": 2, "drm_preference": "wv"}],
        "subtitles": [],
    }
    t = build_tracks(data)
    assert t.videos[0].drm_preference == "playready"
    assert t.audio[0].drm_preference == "wv"


def test_build_tracks_ignores_unknown_drm_preference() -> None:
    data = {"video": [{"id": "v", "codec": "AVC", "width": 1, "height": 1, "drm_preference": "fairplay"}]}
    t = build_tracks(data)
    assert t.videos[0].drm_preference is None


def test_match_track_by_id() -> None:
    a = deserialize_video({"id": "v1", "codec": "AVC", "width": 1920, "height": 1080})
    b = deserialize_video({"id": "v2", "codec": "AVC", "width": 1280, "height": 720})
    remote = deserialize_video({"id": "v2", "codec": "AVC", "width": 1280, "height": 720})
    assert match_track(remote, [a, b]) is b


def test_match_track_by_attributes_when_id_missing() -> None:
    local = deserialize_video({"id": "X", "codec": "AVC", "width": 1920, "height": 1080, "language": "en"})
    remote = deserialize_video({"id": "Y", "codec": "AVC", "width": 1920, "height": 1080, "language": "en"})
    assert match_track(remote, [local]) is local


def test_match_track_by_attributes_keeps_range_and_bitrate_apart() -> None:
    sdr = deserialize_video(
        {"id": "a", "codec": "HEVC", "width": 1920, "height": 960, "language": "en", "range": "SDR", "bitrate": 8000000}
    )
    hdr = deserialize_video(
        {
            "id": "b",
            "codec": "HEVC",
            "width": 1920,
            "height": 960,
            "language": "en",
            "range": "HDR10",
            "bitrate": 5000000,
        }
    )
    remote = deserialize_video(
        {
            "id": "z",
            "codec": "HEVC",
            "width": 1920,
            "height": 960,
            "language": "en",
            "range": "HDR10",
            "bitrate": 5000000,
        }
    )
    assert match_track(remote, [sdr, hdr]) is hdr


def test_match_track_by_attributes_matches_probed_hdr10p_to_local_hdr10() -> None:
    common = {"codec": "HEVC", "width": 3840, "height": 2160, "language": "en", "bitrate": 15000000}
    sdr = deserialize_video({**common, "id": "a", "range": "SDR"})
    hdr10 = deserialize_video({**common, "id": "b", "range": "HDR10"})
    remote = deserialize_video({**common, "id": "z", "range": "HDR10P"})
    assert match_track(remote, [sdr, hdr10]) is hdr10


def test_match_track_no_candidates_returns_none() -> None:
    remote = deserialize_video({"id": "X", "codec": "AVC", "width": 1, "height": 1})
    assert match_track(remote, []) is None


def test_build_title_movie() -> None:
    info = {"type": "movie", "id": "movie-0001", "name": "Foo", "year": 2024, "language": "en"}
    title = build_title(info, "EXAMPLE", "fallback")
    assert isinstance(title, Movie)
    assert title.id == "movie-0001"
    assert title.name == "Foo"


def test_build_title_episode() -> None:
    info = {
        "type": "episode",
        "id": "ep-00001",
        "series_title": "Show",
        "season": 1,
        "number": 2,
        "name": "Pilot",
        "year": 2024,
        "language": "en",
    }
    title = build_title(info, "EXAMPLE", "fallback")
    assert isinstance(title, Episode)
    assert title.season == 1
    assert title.number == 2
    assert title.name == "Pilot"


def test_build_title_falls_back_to_id_when_missing() -> None:
    title = build_title({"type": "movie", "name": "x"}, "EXAMPLE", "fallback-id")
    assert title.id == "fallback-id"


def test_credential_cache_digests_cover_common_key_schemes() -> None:
    import hashlib

    from unshackle.core.credential import Credential
    from unshackle.core.remote_service import credential_cache_digests

    cred = Credential("user@example.com", "hunter2")
    digests = credential_cache_digests(cred)
    assert cred.sha1 in digests
    assert hashlib.sha1(cred.username.encode()).hexdigest() in digests
    assert hashlib.md5(cred.username.encode()).hexdigest() in digests


def test_cache_stem_relevance_filters_foreign_digests_and_profiles() -> None:
    import hashlib

    from unshackle.core.credential import Credential
    from unshackle.core.remote_service import cache_stem_is_relevant, credential_cache_digests

    active = Credential("us@example.com", "pw1")
    other = Credential("uk@example.com", "pw2")
    allowed = credential_cache_digests(active)
    foreign = {"uk"}

    assert cache_stem_is_relevant(f"tokens_{active.sha1}", allowed, "us", foreign)
    assert not cache_stem_is_relevant(f"tokens_{other.sha1}", allowed, "us", foreign)
    username_hash = hashlib.sha1(active.username.encode()).hexdigest()
    assert cache_stem_is_relevant(f"device_id_{username_hash}", allowed, "us", foreign)
    # Service-global state carries no identity marker, so the client sends it
    assert cache_stem_is_relevant("session_guid", allowed, "us", foreign)
    assert cache_stem_is_relevant("tokens", allowed, "us", foreign)
    # Files keyed by profile name: only the active profile's file goes
    assert cache_stem_is_relevant("tokens_us", allowed, "us", foreign)
    assert not cache_stem_is_relevant("tokens_uk", allowed, "us", foreign)
    # Region prefix plus a matching digest (the region is not a profile name here)
    assert cache_stem_is_relevant(f"tokens_intl_{active.sha1}", allowed, "us", foreign)
    # An active-credential digest takes priority over a colliding foreign-profile token
    assert cache_stem_is_relevant(f"tokens_uk_{active.sha1}", allowed, "us", foreign)


def test_cache_stem_relevance_active_profile_beats_region_collision() -> None:
    from unshackle.core.remote_service import cache_stem_is_relevant

    # tokens_{profile}_{region}_{device}_{6hex} style key, where the region "us"
    # collides with a foreign profile named "us"
    assert cache_stem_is_relevant("tokens_default_us_androidtv_abc123", set(), "default", {"us", "de"})
    assert not cache_stem_is_relevant("tokens_us_us_androidtv_abc123", set(), "default", {"us", "de"})
    assert cache_stem_is_relevant("web_device_id_default_us", set(), "default", {"us"})


def test_cache_stem_relevance_without_credential_withholds_hex_stems() -> None:
    from unshackle.core.credential import Credential
    from unshackle.core.remote_service import cache_stem_is_relevant

    stray = Credential("someone@example.com", "pw")
    assert not cache_stem_is_relevant(f"tokens_{stray.sha1}", set(), "default", set())
    assert cache_stem_is_relevant("tokens_guest", set(), "default", set())


def test_cache_stem_relevance_separator_and_case_profile_names() -> None:
    from unshackle.core.remote_service import cache_stem_is_relevant

    # A foreign profile name with separators still matches
    assert not cache_stem_is_relevant("tokens_us-east", set(), "eu", {"us-east"})
    assert not cache_stem_is_relevant("tokens_us_east", set(), "eu", {"us-east"})
    # Case variants of a foreign profile name still match
    assert not cache_stem_is_relevant("tokens_UK", set(), "us", {"uk"})
    # The active profile matches through case and separator variants too
    assert cache_stem_is_relevant("tokens_US-EAST", set(), "us-east", {"eu"})
    # A longer matching foreign name beats an active name that is its prefix
    assert not cache_stem_is_relevant("tokens_us-east", set(), "us", {"us-east"})
    # ...but a shorter foreign match does not override the active name
    assert cache_stem_is_relevant("tokens_default_us_androidtv_abc123", set(), "default", {"us"})


def test_load_cache_files_wiring(tmp_path, monkeypatch) -> None:
    import json
    import logging
    from types import SimpleNamespace

    from unshackle.core.config import config
    from unshackle.core.credential import Credential
    from unshackle.core.remote_service import RemoteService

    tag = "TESTSVC"
    cache_dir = tmp_path / tag
    cache_dir.mkdir()
    other = Credential("other@example.com", "pw2")
    for stem in ("tokens_us", "tokens_uk", "tokens_default", "session_guid", f"tokens_{other.sha1}", "titles_abc"):
        (cache_dir / f"{stem}.json").write_text(json.dumps({"k": stem}))

    monkeypatch.setattr(config.directories, "cache", tmp_path)
    monkeypatch.setattr(
        config,
        "credentials",
        {tag: {"default": "a@example.com:pw", "us": "b@example.com:pw", "uk": "c@example.com:pw"}},
    )
    stub = SimpleNamespace(service_tag=tag, log=logging.getLogger("test"))

    sent = RemoteService.load_cache_files(stub, "us")
    assert set(sent) == {"tokens_us", "session_guid"}

    # A profile with no credentials entry falls back to the default credential
    sent = RemoteService.load_cache_files(stub, "missing")
    assert set(sent) == {"tokens_default", "session_guid"}


def test_load_cache_files_forwards_nested_keys(tmp_path, monkeypatch) -> None:
    """A service that keeps its cache in subfolders (session_web/<sha1>.json) must have
    those files forwarded under the Cacher key, and the credential filter must still apply
    to the basename of a nested file."""
    import base64
    import json
    import logging
    import zlib
    from types import SimpleNamespace

    from unshackle.core.config import config
    from unshackle.core.credential import Credential
    from unshackle.core.remote_service import RemoteService

    tag = "TESTSVC"
    cache_dir = tmp_path / tag
    active = Credential("a@example.com", "pw")
    other = Credential("other@example.com", "pw2")
    for rel in (
        "tokens",
        f"session_web/{active.sha1}",
        f"session_web/{other.sha1}",
        "session_androidtv/default",
        "MSL/web/keys",
        "MSL/web/keys.v2",
        f"{other.sha1}/state",
        "titles_abc",
        "sub/titles_abc",
    ):
        path = cache_dir / f"{rel}.json"
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text(json.dumps({"k": rel}))

    monkeypatch.setattr(config.directories, "cache", tmp_path)
    monkeypatch.setattr(config, "credentials", {tag: {"default": f"{active.username}:{active.password}"}})
    stub = SimpleNamespace(service_tag=tag, log=logging.getLogger("test"))

    sent = RemoteService.load_cache_files(stub, None)
    assert set(sent) == {
        "tokens",
        f"session_web/{active.sha1}",
        "session_androidtv/default",
        "MSL/web/keys",
        "MSL/web/keys.v2",
    }
    payload = json.loads(zlib.decompress(base64.b64decode(sent[f"session_web/{active.sha1}"])))
    assert payload == {"k": f"session_web/{active.sha1}"}


def test_save_returned_cache_writes_nested_keys_and_rejects_escapes(tmp_path, monkeypatch) -> None:
    import base64
    import logging
    import zlib
    from types import SimpleNamespace

    from unshackle.core.config import config
    from unshackle.core.remote_service import RemoteService

    tag = "TESTSVC"
    monkeypatch.setattr(config.directories, "cache", tmp_path)
    stub = SimpleNamespace(service_tag=tag, log=logging.getLogger("test"))

    def blob(text: str) -> str:
        return base64.b64encode(zlib.compress(text.encode())).decode("ascii")

    RemoteService.save_returned_cache(
        stub,
        {
            "tokens": blob('"flat"'),
            "session_web/abc": blob('"nested"'),
            "session_web\\def": blob('"windows"'),
            "MSL/keys.v2": blob('"dotted"'),
            "../escape": blob('"bad"'),
            "/abs": blob('"bad"'),
            "C:/x": blob('"bad"'),
        },
    )

    assert (tmp_path / tag / "tokens.json").read_text() == '"flat"'
    assert (tmp_path / tag / "session_web" / "abc.json").read_text() == '"nested"'
    assert (tmp_path / tag / "session_web" / "def.json").read_text() == '"windows"'
    assert (tmp_path / tag / "MSL" / "keys.v2.json").read_text() == '"dotted"'
    assert not (tmp_path / "escape.json").exists()
    written = sorted(p.relative_to(tmp_path).as_posix() for p in tmp_path.rglob("*.json"))
    assert written == [
        f"{tag}/MSL/keys.v2.json",
        f"{tag}/session_web/abc.json",
        f"{tag}/session_web/def.json",
        f"{tag}/tokens.json",
    ]


def test_save_returned_cache_drops_other_profiles_files(tmp_path, monkeypatch) -> None:
    """A returned file for another profile must not overwrite that profile's local file."""
    import base64
    import logging
    import zlib
    from types import SimpleNamespace

    from unshackle.core.config import config
    from unshackle.core.remote_service import RemoteService

    tag = "TESTSVC"
    monkeypatch.setattr(config.directories, "cache", tmp_path)
    monkeypatch.setattr(config, "credentials", {tag: {"default": "a@example.com:pw", "work": "b@example.com:pw"}})
    stub = SimpleNamespace(service_tag=tag, log=logging.getLogger("test"))
    blob = base64.b64encode(zlib.compress(b'"x"')).decode("ascii")

    RemoteService.save_returned_cache(stub, {"tokens_work": blob, "tokens_default": blob, "tokens": blob}, "work")

    assert sorted(p.name for p in (tmp_path / tag).iterdir()) == ["tokens.json", "tokens_work.json"]


def test_save_returned_cache_ignores_oversized_payload(tmp_path, monkeypatch) -> None:
    import logging
    from types import SimpleNamespace

    from unshackle.core.api.sanitize import MAX_SESSION_CACHE_KEYS
    from unshackle.core.config import config
    from unshackle.core.remote_service import RemoteService

    monkeypatch.setattr(config.directories, "cache", tmp_path)
    stub = SimpleNamespace(service_tag="TESTSVC", log=logging.getLogger("test"))
    RemoteService.save_returned_cache(stub, {f"k{i}": "x" for i in range(MAX_SESSION_CACHE_KEYS + 1)})
    assert not list(tmp_path.rglob("*.json"))


@pytest.mark.asyncio
async def test_session_delete_returns_nested_cache_keys(tmp_path, monkeypatch) -> None:
    """The server harvests a session's whole cache tree and keys each file by its path
    relative to the session cache dir, so it round-trips to the same Cacher key."""
    import base64
    import json
    import zlib
    from types import SimpleNamespace

    from unshackle.core.api import handlers, session_store

    cache_tag = "_sessions/abc/sid/TESTSVC"
    cache_dir = tmp_path / cache_tag
    for rel in ("tokens", "session_web/abc", "titles_x", "MSL/web/keys", "MSL/keys.v2"):
        path = cache_dir / f"{rel}.json"
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text(rel)
    monkeypatch.setattr(handlers.config.directories, "cache", tmp_path)

    session = SimpleNamespace(cache_tag=cache_tag, client_auth=True, input_bridge=None)

    async def fake_validated(session_id, request):
        return session

    class FakeStore:
        async def delete(self, session_id):
            return True

    monkeypatch.setattr(handlers, "get_validated_session", fake_validated)
    monkeypatch.setattr(session_store, "get_session_store", lambda: FakeStore())

    response = await handlers.session_delete_handler("sid", None)
    body = json.loads(response.body)
    assert set(body["cache"]) == {"tokens", "session_web/abc", "MSL/web/keys", "MSL/keys.v2"}
    assert zlib.decompress(base64.b64decode(body["cache"]["session_web/abc"])) == b"session_web/abc"


def test_resolve_manifest_data_matches_across_per_range_manifests() -> None:
    """One ISM manifest per range. The HDR10 track must take the quality level from its
    own manifest, not the same-sized one in the SDR manifest, in any manifest order."""
    import base64
    import zlib

    from tests.core.test_ism_init import VIDEO_HEVC_PQ_CPD, VIDEO_HEVC_SDR_CPD
    from tests.core.test_ism_range import manifest_xml
    from unshackle.core.manifests import ISM
    from unshackle.core.manifests.snapshot import restore

    urls = {"sdr": "https://x/sdr/manifest", "hdr": "https://x/hdr/manifest"}
    xml = {"sdr": manifest_xml(VIDEO_HEVC_SDR_CPD), "hdr": manifest_xml(VIDEO_HEVC_PQ_CPD)}
    local = {k: ISM.from_text(xml[k], url=urls[k]).to_tracks(language="en").videos[0] for k in xml}
    assert local["sdr"].range == Video.Range.SDR and local["hdr"].range == Video.Range.HDR10

    remote_hdr = deserialize_video(
        {
            "id": str(local["hdr"].id),
            "codec": "HEVC",
            "width": 3840,
            "height": 2160,
            "language": "en",
            "range": "HDR10",
            "bitrate_bps": 15000000,
        }
    )
    tracks = build_tracks({"video": [], "audio": [], "subtitles": []})
    tracks.videos.append(remote_hdr)
    manifests = [
        {"type": "ism", "url": urls[k], "data": base64.b64encode(zlib.compress(xml[k].encode())).decode()}
        for k in ("sdr", "hdr")
    ]

    restore(tracks, {"manifests": manifests})

    assert remote_hdr.data["ism"]["quality_level"].get("CodecPrivateData") == VIDEO_HEVC_PQ_CPD


def test_session_create_writes_nested_cache_and_skips_colliding_keys(tmp_path, monkeypatch) -> None:
    """The server writes a nested key under the session cache dir with the ``.json``
    suffix appended, not substituted, and a key that collides with an existing file
    (``x`` then ``x.json/y``) is skipped instead of failing the whole create."""
    import asyncio
    import base64
    import logging
    import zlib
    from types import SimpleNamespace

    from unshackle.core.api import handlers

    class Stop(Exception):
        pass

    def blob(text: str) -> str:
        return base64.b64encode(zlib.compress(text.encode())).decode("ascii")

    monkeypatch.setattr(handlers.config.directories, "cache", tmp_path)
    monkeypatch.setattr(handlers, "validate_service", lambda service, request=None: service)
    monkeypatch.setattr(handlers, "resolve_handler_proxy", lambda *args: (None, []))
    monkeypatch.setattr(handlers, "server_account_for", lambda *args: False)
    monkeypatch.setattr(handlers.Services, "load", lambda service: type("Svc", (), {}))
    monkeypatch.setattr(
        handlers,
        "create_service_instance",
        lambda *args, **kwargs: (SimpleNamespace(log=logging.getLogger("Svc")), None, None),
    )
    monkeypatch.setattr("unshackle.core.api.session_store.refuse_while_draining", lambda: None)
    monkeypatch.setattr("unshackle.core.api.session_store.get_session_store", lambda: (_ for _ in ()).throw(Stop()))

    cache = {"x": blob('"flat"'), "x.json/y": blob('"collides"'), "MSL/keys.v2": blob('"dotted"')}
    response = asyncio.run(handlers.session_create_handler({"service": "TESTSVC", "title_id": "t", "cache": cache}))
    assert response.status == 422  # the Stop stand-in fired after the cache write

    written = {p.name: p.read_text() for p in tmp_path.rglob("*.json") if p.is_file()}
    assert written == {"x.json": '"flat"', "keys.v2.json": '"dotted"'}


class _SentCreate(Exception):
    pass


def _remote_service(parent_params: dict, service_params: dict) -> RemoteService:
    """A RemoteService whose session create raises _SentCreate with the request body."""
    import logging
    from types import SimpleNamespace

    import requests

    def post(path: str, data: dict) -> dict:
        raise _SentCreate(data)

    svc = object.__new__(RemoteService)
    svc.ctx = SimpleNamespace(parent=SimpleNamespace(params={"no_proxy": True, **parent_params}), obj=None)
    svc.service_tag = "EXAMPLE"
    svc.title_id = "t1"
    svc._server_accounts = {"global": True}
    svc._server_cdm = True
    svc._service_params = service_params
    svc._session = requests.Session()
    svc.log = logging.getLogger("test")
    svc.client = SimpleNamespace(post=post, server_url="https://server.example")
    return svc


def _sent_create_data(parent_params: dict, service_params: dict) -> dict:
    with pytest.raises(_SentCreate) as exc:
        _remote_service(parent_params, service_params).authenticate()
    return exc.value.args[0]


@pytest.mark.parametrize("no_proxy, expected", [(False, {"all": "http://proxy.example:8080"}), (True, {})])
def test_the_client_session_downloads_through_the_proxy_it_sends(
    monkeypatch: pytest.MonkeyPatch, no_proxy: bool, expected: dict
) -> None:
    """The client fetches playlists and segments itself, so --proxy must reach its own session too."""
    from unshackle.core import remote_service

    monkeypatch.setattr(remote_service, "resolve_remote_proxy_arg", lambda proxy, providers=None: proxy)
    monkeypatch.setattr("unshackle.core.utils.ip_info.get_ip_info", lambda *args, **kwargs: None)
    svc = _remote_service({"no_proxy": no_proxy, "proxy": "http://proxy.example:8080"}, {})
    with pytest.raises(_SentCreate) as exc:
        svc.authenticate()
    assert dict(svc._session.proxies) == expected
    assert svc._session.trust_env is no_proxy  # a proxied session ignores HTTP(S)_PROXY
    assert exc.value.args[0].get("proxy") == (None if no_proxy else "http://proxy.example:8080")


def test_dl_selection_travels_nested_and_a_service_option_cannot_override_it() -> None:
    parent_params = {
        "lang": ["orig", "es-419"],
        "v_lang": [],
        "a_lang": [],
        "s_lang": ["ko"],
        "acodec": [Audio.Codec.EC3],
        "forced_subs": True,
        "exact_lang": True,
    }
    data = _sent_create_data(parent_params, {"lang": 3, "a_lang": "x"})
    assert data["dl_params"] == {
        "lang": ["orig", "es-419"],
        "v_lang": [],
        "a_lang": [],
        "s_lang": ["ko"],
        "acodec": ["EC3"],
        "forced_subs": True,
        "exact_lang": True,
    }
    assert "lang" not in data and "a_lang" not in data
    assert data["service_params"] == {"lang": 3, "a_lang": "x"}


def test_a_service_profile_option_travels_nested_and_keeps_the_credential_profile() -> None:
    data = _sent_create_data({"profile": "work"}, {"profile": "QC"})
    assert data["profile"] == "work"
    assert data["service_params"] == {"profile": "QC"}


def test_no_dl_params_when_the_ctx_has_no_selection() -> None:
    assert "dl_params" not in _sent_create_data({}, {})


def test_resolve_manifest_data_keeps_the_periods_the_server_filtered() -> None:
    """A service drops periods (a mid-roll ad) on the server only. The client must skip the
    same periods after it re-parses the manifest, or a remote download joins them back in."""
    from unshackle.core.manifests import DASH
    from unshackle.core.manifests.snapshot import capture, restore

    periods = "".join(
        f"""<Period id="{pid}" duration="PT1S"><AdaptationSet contentType="video" mimeType="video/mp4" lang="en">
        <Representation id="v0" codecs="avc1.640028" bandwidth="1000000" width="1920" height="1080">
        <SegmentTemplate timescale="1" duration="1" startNumber="1" initialization="{pid}/i.mp4"
        media="{pid}/$Number$.m4s"/></Representation></AdaptationSet></Period>"""
        for pid in ("main1", "ad1", "main2")
    )
    mpd = f"""<?xml version="1.0"?><MPD xmlns="urn:mpeg:dash:schema:mpd:2011" type="static"
    mediaPresentationDuration="PT3S"><BaseURL>https://x/</BaseURL>{periods}</MPD>"""
    server = DASH.from_text(mpd, url="https://x/manifest.mpd").to_tracks(language="en")
    for track in server:
        track.data["dash"]["filtered_period_ids"] = ["ad1"]

    remote = deserialize_video(serialize_video_track(server.videos[0]))
    tracks = build_tracks({"video": [], "audio": [], "subtitles": []})
    tracks.videos.append(remote)
    restore(tracks, capture(server))

    assert remote.data["dash"]["filtered_period_ids"] == ["ad1"]