"""Tests for the ``GenerationState`` str-Enum and its construction waist.

These pin three things the non-breaking typing refinement (#1345) depends on:

* ``GenerationState`` behaves exactly like the bare status strings it replaced
  (``==``, ``in``, ``str``/``f""``, ``json.dumps``, ``isinstance(_, str)``), and
  ``__str__``/``__repr__`` keep display + ``console.print`` output unchanged.
* The private ``_status_from_code`` waist covers every status code the API can
  emit (the *range pin*), honouring ``None -> PENDING``.
* The five producers partition the states correctly: ``REMOVED`` is emitted only
  by ``wait_for_completion``; ``poll_status`` and ``_parse_generation_result``
  never fabricate it (and the parsers never emit ``NOT_FOUND`` either).
"""

from __future__ import annotations

import json
from contextlib import asynccontextmanager
from dataclasses import asdict
from unittest.mock import AsyncMock, MagicMock

import pytest

import notebooklm
import notebooklm.types
from notebooklm._artifact.polling import ArtifactPollingService
from notebooklm._types.artifacts import _status_from_code
from notebooklm.cli.error_handler import _generation_status_extra
from notebooklm.exceptions import ArtifactTimeoutError
from notebooklm.rpc.types import _ARTIFACT_STATUS_MAP, ArtifactStatus
from notebooklm.types import GenerationState, GenerationStatus

# ---------------------------------------------------------------------------
# Export surface + module identity
# ---------------------------------------------------------------------------


def test_generation_state_exported_from_both_facades():
    assert notebooklm.GenerationState is GenerationState
    assert notebooklm.types.GenerationState is GenerationState


def test_generation_state_module_is_public_types():
    # The types.py __module__-rewrite makes it look like it lives in the
    # public facade (so pickle + repr advertise the stable path).
    assert GenerationState.__module__ == "notebooklm.types"


# ---------------------------------------------------------------------------
# str-Enum behaviour (the non-breaking contract)
# ---------------------------------------------------------------------------


@pytest.mark.parametrize("member", list(GenerationState))
def test_str_returns_bare_value(member: GenerationState):
    assert str(member) == member.value
    assert f"{member}" == member.value


@pytest.mark.parametrize("member", list(GenerationState))
def test_repr_matches_plain_string_repr(member: GenerationState):
    # console.print(status) at cli/artifact_cmd.py renders the GenerationStatus
    # dataclass via repr(); without this the status field would render as
    # "<GenerationState.COMPLETED: 'completed'>" instead of "'completed'".
    assert repr(member) == repr(member.value)


@pytest.mark.parametrize("member", list(GenerationState))
def test_member_is_a_str_instance(member: GenerationState):
    assert isinstance(member, str)


def test_generation_state_values_are_unique():
    # Iterate __members__ (not the class) so duplicate-value aliases — which
    # Enum silently collapses when iterating the class — are still detected.
    # A stray alias would shrink list(GenerationState) and silently weaken the
    # parametrized member tests above.
    values = [member.value for member in GenerationState.__members__.values()]
    assert len(values) == len(set(values))


def test_equality_and_membership_against_bare_strings():
    assert GenerationState.COMPLETED == "completed"
    assert GenerationState.FAILED in {"failed", "removed"}
    # Reverse operand order: a bare str on the left still compares equal.
    plain = "completed"
    assert plain == GenerationState.COMPLETED


def test_json_dumps_member_is_bare_string():
    assert json.dumps(GenerationState.COMPLETED) == '"completed"'


def test_generation_status_repr_unchanged_with_enum_status():
    enum_built = GenerationStatus(task_id="t", status=GenerationState.COMPLETED)
    str_built = GenerationStatus(task_id="t", status="completed")
    assert repr(enum_built) == repr(str_built)
    assert "'completed'" in repr(enum_built)
    assert "GenerationState" not in repr(enum_built)


def test_console_print_renders_enum_status_identically():
    from io import StringIO

    from rich.console import Console

    def render(status: GenerationStatus) -> str:
        buffer = StringIO()
        Console(file=buffer, width=200, no_color=True).print(status)
        return buffer.getvalue()

    enum_built = GenerationStatus(task_id="t", status=GenerationState.COMPLETED)
    str_built = GenerationStatus(task_id="t", status="completed")
    assert render(enum_built) == render(str_built)


def test_asdict_to_json_round_trips_to_bare_string():
    status = GenerationStatus(task_id="t", status=GenerationState.COMPLETED)
    dumped = json.dumps(asdict(status))
    assert json.loads(dumped)["status"] == "completed"


# ---------------------------------------------------------------------------
# Raw-string-constructed instances keep their predicates working
# ---------------------------------------------------------------------------


def test_raw_string_constructed_predicates():
    assert GenerationStatus(task_id="t", status="completed").is_complete is True
    assert GenerationStatus(task_id="t", status="failed").is_failed is True
    assert GenerationStatus(task_id="t", status="pending").is_pending is True
    assert GenerationStatus(task_id="t", status="in_progress").is_in_progress is True
    assert GenerationStatus(task_id="t", status="not_found").is_not_found is True
    assert GenerationStatus(task_id="t", status="removed").is_removed is True


def test_raw_string_rate_limited_chain():
    rate_limited = GenerationStatus(
        task_id="t",
        status="removed",
        error="Daily quota exceeded",
    )
    assert rate_limited.is_rate_limited is True

    code_based = GenerationStatus(
        task_id="t",
        status="failed",
        error_code="USER_DISPLAYABLE_ERROR",
    )
    assert code_based.is_rate_limited is True


def test_enum_constructed_predicates():
    assert GenerationStatus(task_id="t", status=GenerationState.COMPLETED).is_complete is True
    assert GenerationStatus(task_id="t", status=GenerationState.NOT_FOUND).is_not_found is True


# ---------------------------------------------------------------------------
# CLI --json and exception/error-handler serialization stay bare strings
# ---------------------------------------------------------------------------


def test_cli_json_dict_emits_bare_status_string():
    # Mirrors the dict built at cli/artifact_cmd.py before json output.
    status = GenerationStatus(task_id="t", status=GenerationState.COMPLETED, url="u")
    payload = {"task_id": status.task_id, "status": status.status, "url": status.url}
    assert json.loads(json.dumps(payload))["status"] == "completed"


def test_exception_status_history_joins_bare_strings():
    transitions = [
        GenerationStatus(task_id="t", status=GenerationState.PENDING),
        GenerationStatus(task_id="t", status=GenerationState.IN_PROGRESS),
        GenerationStatus(task_id="t", status=GenerationState.REMOVED),
    ]
    err = ArtifactTimeoutError("nb1", "task1", 1.0, status_transitions=transitions)
    assert err.status_history == ("pending", "in_progress", "removed")
    assert " -> ".join(err.status_history) == "pending -> in_progress -> removed"
    assert "GenerationState" not in str(err)


def test_error_handler_extra_serializes_bare_status():
    status = GenerationStatus(task_id="t", status=GenerationState.FAILED)
    extra = _generation_status_extra(status)
    assert json.loads(json.dumps(extra))["status"] == "failed"


# ---------------------------------------------------------------------------
# W3: range pin — _status_from_code can never raise on a real API code
# ---------------------------------------------------------------------------


def test_status_map_values_are_subset_of_generation_state():
    api_status_strings = set(_ARTIFACT_STATUS_MAP.values()) | {
        "unknown",
        "not_found",
        "removed",
    }
    state_values = {member.value for member in GenerationState}
    assert api_status_strings <= state_values


def test_status_from_code_covers_every_mapped_code():
    for code, expected in _ARTIFACT_STATUS_MAP.items():
        result = _status_from_code(code)
        assert isinstance(result, GenerationState)
        assert result.value == expected


def test_status_from_code_none_defaults_to_pending():
    assert _status_from_code(None) is GenerationState.PENDING


def test_status_from_code_none_status_override():
    assert _status_from_code(None, none_status=GenerationState.UNKNOWN) is GenerationState.UNKNOWN


def test_status_from_code_unknown_code_is_unknown():
    assert _status_from_code(9999) is GenerationState.UNKNOWN


def test_generation_state_rejects_unmapped_string():
    # The ValueError that _status_from_code's defensive branch guards against:
    # a status string with no matching member raises on direct construction.
    # The range pin above proves artifact_status_to_str never produces such a
    # string today, so the guard is purely future-drift insurance.
    with pytest.raises(ValueError):
        GenerationState("some_future_status")


def test_status_from_code_never_returns_wait_only_states():
    codes = [None, *_ARTIFACT_STATUS_MAP.keys(), 9999]
    for code in codes:
        assert _status_from_code(code) not in {
            GenerationState.NOT_FOUND,
            GenerationState.REMOVED,
        }


# ---------------------------------------------------------------------------
# W3: producer partition — poll_status / _parse_generation_result never emit
# REMOVED; only wait_for_completion does.
# ---------------------------------------------------------------------------


class _StubProvider:
    """Minimal loop-guard / op-scope stub.

    ``poll_status`` never touches either collaborator, but the constructor
    requires them; a plain class avoids ``MagicMock`` blocking the
    ``assert_bound_loop`` attribute name.
    """

    bound_loop = None

    def assert_bound_loop(self) -> None:
        return None


def _make_polling_service() -> ArtifactPollingService:
    provider = _StubProvider()
    return ArtifactPollingService(
        loop_guard=provider,
        op_scope=provider,
        sleep=AsyncMock(),
        monotonic=lambda: 0.0,
    )


async def _poll_with_status_code(code: int | None) -> GenerationStatus:
    service = _make_polling_service()
    # Minimal LIST_ARTIFACTS row: [id, title, type_code, error, status_code].
    row = ["task1", "Title", 7, None, code]

    async def list_raw(_notebook_id: str) -> list:
        return [row]

    return await service.poll_status(
        "nb1",
        "task1",
        list_raw=list_raw,
        is_media_ready=lambda *_: True,
        get_artifact_type_name=lambda _code: "report",
        extract_artifact_error=lambda _raw: "err",
    )


@pytest.mark.asyncio
@pytest.mark.parametrize("code", list(_ARTIFACT_STATUS_MAP.keys()) + [9999])
async def test_poll_status_never_returns_removed(code: int):
    status = await _poll_with_status_code(code)
    assert status.status is not GenerationState.REMOVED


@pytest.mark.asyncio
async def test_poll_status_completed_code_maps_to_completed():
    status = await _poll_with_status_code(ArtifactStatus.COMPLETED)
    assert status.status is GenerationState.COMPLETED


@pytest.mark.asyncio
async def test_poll_status_missing_artifact_is_not_found_not_removed():
    service = _make_polling_service()

    async def list_raw(_notebook_id: str) -> list:
        return []

    status = await service.poll_status(
        "nb1",
        "task1",
        list_raw=list_raw,
        is_media_ready=lambda *_: True,
        get_artifact_type_name=lambda _code: "report",
        extract_artifact_error=lambda _raw: "err",
    )
    assert status.status is GenerationState.NOT_FOUND
    assert status.status is not GenerationState.REMOVED


@asynccontextmanager
async def _noop_operation_scope():
    yield None


def _make_parse_api():
    from notebooklm._artifacts import ArtifactsAPI
    from tests._fixtures.fake_core import make_fake_core

    core = make_fake_core(
        rpc_call=AsyncMock(),
        get_source_ids=AsyncMock(return_value=[]),
        operation_scope=MagicMock(side_effect=lambda _label: _noop_operation_scope()),
    )
    notebooks = MagicMock()
    notebooks.get_source_ids = AsyncMock(return_value=[])
    return ArtifactsAPI(
        rpc=core,
        drain=core,
        lifecycle=core,
        notebooks=notebooks,
        mind_maps=MagicMock(),
        note_service=MagicMock(),
    )


@pytest.mark.parametrize("code", list(_ARTIFACT_STATUS_MAP.keys()) + [9999, None])
def test_parse_generation_result_never_emits_wait_or_notfound_states(code):
    api = _make_parse_api()
    result = api._parse_generation_result(
        [["artifact_x", "Title", 7, None, code]], method_id="R7cb6c"
    )
    assert isinstance(result.status, GenerationState)
    assert result.status not in {GenerationState.REMOVED, GenerationState.NOT_FOUND}


def test_parse_generation_result_none_code_is_pending():
    api = _make_parse_api()
    result = api._parse_generation_result(
        [["artifact_x", "Title", 7, None, None]], method_id="R7cb6c"
    )
    assert result.status is GenerationState.PENDING