"""Unit tests for ``NotebookLMClient._reqid.next_reqid``.

Covers:
- ``next_reqid()`` returns monotonic, post-increment values.
- Custom ``step`` parameter works.
- ``next_reqid()`` itself does NOT emit a ``DeprecationWarning``.

The ``NotebookLMClient.next_reqid`` compatibility forward was deleted in Wave 11c
of session-decoupling; callers reach the canonical counter directly via
``core._collaborators.reqid.next_reqid(...)``. The ``_reqid_counter`` compat property +
setter (the read-bridge and the deprecation gesture on direct mutation)
were retired earlier in the session-shrink arc; tests read
``core._collaborators.reqid.value`` directly and use ``core._collaborators.reqid.set_value(...)`` to
seed a baseline.
"""

import warnings

import pytest

from notebooklm.auth import AuthTokens
from notebooklm.client import NotebookLMClient
from tests._helpers.client_factory import build_client_shell_for_tests


def _make_core() -> NotebookLMClient:
    auth = AuthTokens(
        cookies={"SID": "test"},
        csrf_token="test_csrf",
        session_id="test_session",
    )
    return build_client_shell_for_tests(auth=auth)


@pytest.mark.asyncio
async def test_next_reqid_returns_post_increment_values() -> None:
    """Three successive calls bump by the default step and return new values."""
    core = _make_core()
    assert core._collaborators.reqid.value == 100000  # baseline

    first = await core._collaborators.reqid.next_reqid()
    second = await core._collaborators.reqid.next_reqid()
    third = await core._collaborators.reqid.next_reqid()

    assert first == 200000
    assert second == 300000
    assert third == 400000
    # And the property reflects the final state.
    assert core._collaborators.reqid.value == 400000


@pytest.mark.asyncio
async def test_next_reqid_custom_step() -> None:
    """A non-default ``step`` parameter is honoured."""
    core = _make_core()
    assert await core._collaborators.reqid.next_reqid(step=1) == 100001
    assert await core._collaborators.reqid.next_reqid(step=7) == 100008
    assert await core._collaborators.reqid.next_reqid(step=1000) == 101008


@pytest.mark.asyncio
async def test_next_reqid_does_not_warn() -> None:
    """The intended API surface must be silent — no ``DeprecationWarning``."""
    core = _make_core()
    with warnings.catch_warnings(record=True) as caught:
        warnings.simplefilter("always")
        await core._collaborators.reqid.next_reqid()
        await core._collaborators.reqid.next_reqid()
    deprecations = [w for w in caught if issubclass(w.category, DeprecationWarning)]
    assert deprecations == [], (
        "next_reqid() must not emit DeprecationWarning; "
        f"got {[(w.category.__name__, str(w.message)) for w in deprecations]}"
    )


@pytest.mark.asyncio
async def test_next_reqid_rejects_zero_step() -> None:
    """``step=0`` would break uniqueness (two callers see the same value)."""
    core = _make_core()
    with pytest.raises(ValueError, match="step must be positive"):
        await core._collaborators.reqid.next_reqid(step=0)
    # Counter must not have moved.
    assert core._collaborators.reqid.value == 100000


@pytest.mark.asyncio
async def test_next_reqid_rejects_negative_step() -> None:
    """``step<0`` would break monotonicity (counter moves backwards)."""
    core = _make_core()
    with pytest.raises(ValueError, match="step must be positive"):
        await core._collaborators.reqid.next_reqid(step=-1)
    assert core._collaborators.reqid.value == 100000


@pytest.mark.asyncio
async def test_next_reqid_rejects_non_int_step() -> None:
    """Non-``int`` ``step`` (e.g. ``str``) must raise ``TypeError`` early."""
    core = _make_core()
    with pytest.raises(TypeError, match="step must be int"):
        await core._collaborators.reqid.next_reqid(step="100")  # type: ignore[arg-type]
    assert core._collaborators.reqid.value == 100000


@pytest.mark.asyncio
async def test_next_reqid_rejects_bool_step() -> None:
    """``bool`` is a subclass of ``int`` in Python; the guard must still
    reject ``step=True`` to prevent a silent degradation to ``step=1``.
    """
    core = _make_core()
    with pytest.raises(TypeError, match="step must be int"):
        await core._collaborators.reqid.next_reqid(step=True)  # type: ignore[arg-type]
    with pytest.raises(TypeError, match="step must be int"):
        await core._collaborators.reqid.next_reqid(step=False)  # type: ignore[arg-type]
    assert core._collaborators.reqid.value == 100000