"""The daily full watch reconcile (`run_plex_watch_reconcile`) — the one pass that DELETES watch state:
a mirrored row Plex no longer has a record for is read as "Plex un-watched it" and cleared. E32 S2
found it trusting a scan a Plex hiccup had cut short; these hold what it may and may not clear.
"""

import pytest
from sqlalchemy import select

from app import sysconfig
from app.models import PlexItem, PlexLibrary, PlexLink, PlexState, User
from app.plex import watch_sync


class _FakePlex:
    """A PlexClient stand-in: one movie section whose listing reports `total` (more than it hands
    over = a walk cut short), and a record of every write the reconcile sends back to Plex."""

    def __init__(self, leaves: list[dict], total: int | None = None):
        self.leaves = leaves
        self.total = len(leaves) if total is None else total
        self.calls: list[tuple] = []

    def __enter__(self):
        return self

    def __exit__(self, *exc):
        return False

    def sections(self):
        return [{"type": "movie", "key": "1"}]

    def section_items(self, key, item_type, start, size):
        return self.leaves[start : start + size], self.total

    def scrobble(self, rk):
        self.calls.append(("scrobble", rk))

    def unscrobble(self, rk):
        self.calls.append(("unscrobble", rk))

    def set_timeline(self, rk, time_ms, duration_ms):
        self.calls.append(("timeline", rk, time_ms))


@pytest.fixture
def world(db):
    """Five mirrored movies and the owner's link; each test sets the local states it needs."""
    sysconfig.set_value(db, "plex_enabled", True)
    lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
    user = User(email="reconcile@example.com")
    db.add_all([lib, user])
    db.flush()
    items = {}
    for rk in ("m1", "m2", "m3", "m4", "m5"):
        items[rk] = PlexItem(
            rating_key=rk, library_id=lib.id, kind="movie", title=rk, duration_s=6000
        )
        db.add(items[rk])
    db.add(
        PlexLink(
            user_id=user.id,
            uses_admin=True,
            sync_enabled=True,
            initial_import_done=True,
            plex_account_id=1,
        )
    )
    db.flush()

    def state(rk, **kw):
        db.add(PlexState(user_id=user.id, item_id=items[rk].id, **kw))

    def rows():
        db.expire_all()
        by_id = {i.id: rk for rk, i in items.items()}
        return {
            by_id[s.item_id]: (s.status, s.position_seconds, s.synced_to_plex)
            for s in db.execute(select(PlexState).where(PlexState.user_id == user.id)).scalars()
        }

    return state, rows


def _run(db, monkeypatch, plex):
    monkeypatch.setattr(watch_sync, "PlexClient", lambda _db: plex)
    return watch_sync.run_plex_watch_reconcile(db)


def _local_states(state):
    state("m1", status="watched", synced_to_plex=True)  # mirrored; Plex has no record now
    state("m2", status="watched", synced_to_plex=False)  # local change that never reached Plex
    state("m3", status="hidden", synced_to_plex=True)  # Siftlode-only, never cleared
    state("m5", status="new", position_seconds=300, synced_to_plex=True)  # Plex says otherwise


def test_a_complete_scan_clears_what_plex_unwatched_and_keeps_the_rest(db, monkeypatch, world):
    state, rows = world
    _local_states(state)
    db.commit()
    plex = _FakePlex(
        [
            {"ratingKey": "m3"},  # listed, no watch signal
            {"ratingKey": "m4", "viewCount": 1, "lastViewedAt": 1_700_000_000},
            {"ratingKey": "m5", "viewOffset": 120_000, "lastViewedAt": 1_700_000_000},
        ]
    )
    out = _run(db, monkeypatch, plex)
    assert rows() == {
        "m2": ("watched", 0, True),  # re-pushed, then settled
        "m3": ("hidden", 0, True),
        "m4": ("watched", 0, True),  # pulled in
        "m5": ("new", 120, True),  # Plex's position wins
    }
    assert ("scrobble", "m2") in plex.calls
    assert out["cleared"] == 1 and out["repushed"] == 1 and "incomplete" not in out


def test_a_scan_cut_short_clears_nothing(db, monkeypatch, world):
    state, rows = world
    _local_states(state)
    db.commit()
    # The server said 5, the walk got 3: m1 may simply not have been reached.
    plex = _FakePlex(
        [
            {"ratingKey": "m3"},
            {"ratingKey": "m4", "viewCount": 1, "lastViewedAt": 1_700_000_000},
            {"ratingKey": "m5", "viewOffset": 120_000, "lastViewedAt": 1_700_000_000},
        ],
        total=5,
    )
    out = _run(db, monkeypatch, plex)
    after = rows()
    assert after["m1"] == ("watched", 0, True)  # NOT un-watched on a partial picture
    assert after["m4"] == ("watched", 0, True) and after["m5"] == ("new", 120, True)  # pulls stand
    assert after["m2"] == ("watched", 0, True)  # the dirty row is still pushed up
    assert out["cleared"] == 0 and out["incomplete"] == 1


def test_an_empty_listing_is_not_a_library_of_unwatched_titles(db, monkeypatch, world):
    state, rows = world
    state("m1", status="watched", synced_to_plex=True)
    db.commit()
    out = _run(db, monkeypatch, _FakePlex([]))
    assert rows() == {"m1": ("watched", 0, True)}
    assert out["cleared"] == 0


def test_a_dirty_resume_is_re_pushed_as_a_timeline_and_a_dirty_reset_as_an_unscrobble(
    db, monkeypatch, world
):
    state, rows = world
    state("m1", status="new", position_seconds=300, synced_to_plex=False)
    state("m2", status="new", position_seconds=2, synced_to_plex=False)  # under the 5 s floor
    db.commit()
    plex = _FakePlex([{"ratingKey": rk} for rk in ("m1", "m2", "m3", "m4", "m5")])
    _run(db, monkeypatch, plex)
    assert ("timeline", "m1", 300_000) in plex.calls
    assert ("unscrobble", "m2") in plex.calls
    assert {rk: synced for rk, (_s, _p, synced) in rows().items()} == {"m1": True, "m2": True}


def test_watch_fields_map_to_a_state_only_when_plex_holds_a_signal():
    to = watch_sync._plex_watch_to_state
    assert to(None, None, None) is None
    assert to(0, 4_000, None) is None  # a stray few seconds is not "in progress"
    assert to(0, 90_000, 1_700_000_000)[:2] == ("new", 90)
    assert to("2", 90_000, 1_700_000_000)[:2] == ("watched", 0)  # watched wins over an offset