"""Shared fixtures and helpers for screen_locker tests.

Safety:
  ``_block_real_tk_and_exit`` (autouse) replaces the **entire** ``tk`` module
  reference inside ``screen_lock`` with a MagicMock, replaces ``GateRoot``
  with a callable returning that same mock root, and stubs ``sys.exit`` — no
  test can create a real Tk root, go fullscreen, or grab input, even one
  that forgets to request the explicit ``mock_tk`` fixture.
"""

from __future__ import annotations

from contextlib import ExitStack
from datetime import datetime, timezone
import json
from pathlib import Path
import tkinter as tk
from typing import TYPE_CHECKING
from unittest.mock import MagicMock, patch

import pytest

from screen_locker.tests._gatelock_fixtures import (
    FAKE_OUTPUTS,
    TWO_OUTPUTS,
    _hermetic_gatelock,
    dual_output,
)
from screen_locker.tests._locker_factories import (
    _make_locker,
    create_locker,
    create_locker_early_bird,
    create_locker_relaxed_day,
)

if TYPE_CHECKING:
    from collections.abc import Generator, Iterator


# Every module that imports ``tkinter as tk`` and calls it directly. The UI is
# split across these, so each ``tk`` must be patched — so no test touches a real
# display and a ``mock_tk`` holder sees widgets made on that same mock.
_TK_MODULES = (
    "screen_locker.screen_lock",
    "screen_locker._sick_dialog",
    "screen_locker._manual_workout_dialog",
    "screen_locker._manual_workout_widgets",
    "screen_locker._ui_widgets",
    "screen_locker._window_setup",
    "screen_locker.status_view",
    "screen_locker._heat_skip",
    "screen_locker._surface_group",
    # The scroll viewport the lock surfaces are built from lives in gatelock
    # and imports tkinter independently, so it needs the same mock -- otherwise
    # container.first is a *real* tk.Frame whose winfo_children() cannot be
    # stubbed, and every surface assertion breaks.
    "gatelock._scrollable",
)
__all__ = [
    "FAKE_OUTPUTS",
    "TWO_OUTPUTS",
    "_hermetic_gatelock",
    "_make_locker",
    "create_locker",
    "create_locker_early_bird",
    "create_locker_relaxed_day",
    "dual_output",
]

_VT_SHUTIL = "gatelock._vt.shutil"
_VT_SUBPROCESS = "gatelock._vt.subprocess"


def _make_mock_tk() -> MagicMock:
    """Build a MagicMock that stands in for the ``tkinter`` module."""
    mock = MagicMock()
    mock_root = MagicMock()
    mock_root.winfo_screenwidth.return_value = 1920
    mock_root.winfo_screenheight.return_value = 1080
    mock.Tk.return_value = mock_root

    mock_frame = MagicMock()
    mock_frame.winfo_children.return_value = []
    mock.Frame.return_value = mock_frame

    # Keep real TclError so ``except tk.TclError`` still works.
    mock.TclError = tk.TclError
    return mock


@pytest.fixture(autouse=True)
def _block_real_tk_and_exit() -> Iterator[None]:
    """Replace the whole ``tk`` module and ``sys.exit`` for every test.

    Patching the entire module (not just ``tk.Tk``) ensures that
    **nothing** in tkinter can touch the real display server.
    """
    mock = _make_mock_tk()

    with ExitStack() as stack:
        for module in _TK_MODULES:
            stack.enter_context(patch(f"{module}.tk", mock))
        stack.enter_context(
            patch(
                "screen_locker.screen_lock.GateRoot",
                return_value=mock.Tk.return_value,
            )
        )
        stack.enter_context(patch("screen_locker.screen_lock.sys.exit"))
        # The startup early-exit checks moved to _startup_checks; sys.exit is
        # bound there now, so it needs blocking separately.
        stack.enter_context(patch("screen_locker._startup_checks.sys.exit"))
        yield


@pytest.fixture(autouse=True)
def mock_subprocess_run() -> Generator[MagicMock]:
    """Block real subprocess calls (e.g. setxkbmap) for every test.

    Also exposed as a named fixture so individual tests can assert
    on the calls made (e.g. VT switching tests).

    ``shutil.which`` is mocked to return a stable fake path so tests work
    regardless of whether setxkbmap is installed on the host machine.
    """
    with (
        patch(f"{_VT_SHUTIL}.which", return_value="/usr/bin/setxkbmap"),
        patch(f"{_VT_SUBPROCESS}.run") as mock,
    ):
        yield mock


@pytest.fixture(autouse=True)
def _block_real_network() -> Iterator[None]:
    """Block real subnet probes and wttr.in calls for every test.

    Otherwise phone verification / StatusWindow's temperature fetch would
    reach the real network. Tests needing a real probe patch it locally.
    """
    targets = (
        "screen_locker._phone_verification.socket.create_connection",
        "screen_locker._temperature.urllib.request.urlopen",
    )
    with ExitStack() as stack:
        for target in targets:
            stack.enter_context(patch(target, side_effect=OSError("blocked")))
        yield


@pytest.fixture(autouse=True)
def _isolate_sick_history(tmp_path: Path) -> Iterator[None]:
    """Redirect SICK_HISTORY_FILE to tmp_path so tests cannot touch real state."""
    target = tmp_path / "sick_history.json"
    with (
        patch(
            "screen_locker._sick_tracker.SICK_HISTORY_FILE",
            target,
        ),
        patch(
            "screen_locker._constants.SICK_HISTORY_FILE",
            target,
        ),
    ):
        yield


@pytest.fixture(autouse=True)
def _isolate_early_bird_pending(tmp_path: Path) -> Iterator[None]:
    """Redirect EARLY_BIRD_PENDING_FILE to tmp_path so tests use a clean file."""
    target = tmp_path / "early_bird_pending.json"
    with (
        patch(
            "screen_locker._early_bird.EARLY_BIRD_PENDING_FILE",
            target,
        ),
        patch(
            "screen_locker._constants.EARLY_BIRD_PENDING_FILE",
            target,
        ),
    ):
        yield


@pytest.fixture(autouse=True)
def _isolate_extra_benefits(tmp_path: Path) -> Iterator[None]:
    """Redirect EXTRA_BENEFITS_FILE to tmp_path so tests cannot touch real state.

    Bound by value into several modules at import time, so every bound name
    needs patching individually — not just the ``_constants`` source.
    """
    target = tmp_path / "extra_benefits_state.json"
    with (
        patch("screen_locker._constants.EXTRA_BENEFITS_FILE", target),
        patch("screen_locker._startup_checks.EXTRA_BENEFITS_FILE", target),
        patch("screen_locker._sync_mixin.EXTRA_BENEFITS_FILE", target),
        patch("screen_locker._early_bird.EXTRA_BENEFITS_FILE", target),
        patch("screen_locker._status.EXTRA_BENEFITS_FILE", target),
    ):
        yield


@pytest.fixture(autouse=True)
def _isolate_shutdown_base(tmp_path: Path) -> Iterator[None]:
    """Redirect SHUTDOWN_BASE_FILE to tmp_path so tests cannot touch real state.

    Pre-seeded with today's date so reset_to_base_if_new_day() is a no-op by
    default (matching the real file's steady state) -- tests that want to
    exercise the actual reset path patch reset_to_base_if_new_day directly,
    same as the rest of the suite already does.
    """
    target = tmp_path / "shutdown_base.json"
    today = datetime.now(tz=timezone.utc).strftime("%Y-%m-%d")
    target.write_text(
        json.dumps(
            {"base_mon_wed_hour": 21, "base_thu_sun_hour": 21, "last_reset_date": today}
        )
    )
    with (
        patch("screen_locker._constants.SHUTDOWN_BASE_FILE", target),
        patch("screen_locker._startup_checks.SHUTDOWN_BASE_FILE", target),
    ):
        yield


@pytest.fixture(autouse=True)
def _isolate_sick_day_state(tmp_path: Path) -> Iterator[None]:
    """Redirect SICK_DAY_STATE_FILE to tmp_path so tests cannot touch real state."""
    target = tmp_path / "sick_day_state.json"
    with (
        patch("screen_locker._constants.SICK_DAY_STATE_FILE", target),
        patch("screen_locker._startup_checks.SICK_DAY_STATE_FILE", target),
    ):
        yield


@pytest.fixture(autouse=True)
def _isolate_scheduled_skips(tmp_path: Path) -> Iterator[None]:
    """Redirect SCHEDULED_SKIPS_FILE to tmp_path so tests use a clean file."""
    target = tmp_path / "scheduled_skips.json"
    with patch(
        "screen_locker._log_mixin.SCHEDULED_SKIPS_FILE",
        target,
    ):
        yield


@pytest.fixture(autouse=True)
def _mock_weekly_logic() -> Iterator[None]:
    """Default to Fri-Mon enforcement with weekly minimum not yet met.

    Without this, tests that run on a Tue/Wed/Thu would hit the relaxed-day
    branch instead of the full-lock path that existing tests expect.
    Setting has_weekly_minimum=False ensures the full lock is shown
    (weekly quota not reached → enforce).
    """
    with (
        patch(
            "screen_locker._startup_checks.is_relaxed_day",
            return_value=False,
        ),
        patch(
            "screen_locker._startup_checks.has_weekly_minimum",
            return_value=False,
        ),
    ):
        yield


@pytest.fixture
def mock_tk() -> Generator[MagicMock]:
    """Mock the ``tkinter`` module across every UI module for display-free tests.

    Patches the same single mock into all ``_TK_MODULES`` so assertions on
    ``mock_tk.Button`` capture widgets created by any of the split UI mixins
    (``_ui_widgets``, ``_sick_dialog``, ...), not just ``screen_lock``.
    """
    mock = _make_mock_tk()
    with ExitStack() as stack:
        for module in _TK_MODULES:
            stack.enter_context(patch(f"{module}.tk", mock))
        stack.enter_context(
            patch(
                "screen_locker.screen_lock.GateRoot",
                return_value=mock.Tk.return_value,
            )
        )
        yield mock


@pytest.fixture
def mock_sys_exit() -> Generator[MagicMock]:
    """Mock sys.exit to prevent test termination."""
    with patch("screen_locker.screen_lock.sys.exit") as mock:
        yield mock


@pytest.fixture
def _mock_sys_exit(mock_sys_exit: MagicMock) -> MagicMock:
    """Alias for mock_sys_exit when the return value is unused."""
    return mock_sys_exit


@pytest.fixture
def temp_log_file(tmp_path: Path) -> Path:
    """Create a temporary log file path."""
    return tmp_path / "workout_log.json"


@pytest.fixture(autouse=True)
def _no_real_firebase_config(monkeypatch: pytest.MonkeyPatch) -> None:
    """Point the Firebase config at a path that does not exist.

    ``remote_client`` reads ``crdt_sync.CONFIG_FILE`` to decide whether to
    build a Firebase-primary mirror. On a developer machine that file *does*
    exist, so without this the sync tests would reach the real database and
    assert against live data instead of their own fakes. Tests that want the
    Firebase path point it back at a file they control.
    """
    from screen_locker import _workout_sync

    monkeypatch.setattr(
        _workout_sync, "CONFIG_FILE", Path("/nonexistent/firebase.json")
    )