"""The status window's "Check Phone" verify-and-credit flow.

Split out of ``status_view`` to keep that module focused on rendering. Holds
the one place the voluntary status window *writes*: a verified workout here is
appended to the log and earns its shutdown reward, exactly as the locked
screen's unlock does.
"""

from __future__ import annotations

from concurrent.futures import ThreadPoolExecutor
from dataclasses import dataclass
from datetime import date
from typing import TYPE_CHECKING

import earned_time

from screen_locker._day import today_str
from screen_locker._earned import extra_minutes, span
from screen_locker._status_data import gather_status
from screen_locker._weekly_check import WEEKLY_WORKOUT_MINIMUM, count_weekly_workouts
from screen_locker.screen_lock import ScreenLocker

if TYPE_CHECKING:
    from collections.abc import Callable
    from concurrent.futures import Future
    from pathlib import Path

    from screen_locker._workout_credit import WorkoutCreditResult


@dataclass(frozen=True)
class PhoneCheckOutcome:
    """Result of the "Check Phone" button's verify-then-backfill chain.

    ``credited_type`` is ``"phone_verified"`` / ``"runnerup_verified"`` when
    *today's* workout verified directly, or ``None`` otherwise (whether or
    not the week-scan backfill found something — that's reported separately
    via ``week_fill_message``, since it applies its own credit already).
    """

    credited_type: str | None
    status: str
    phone_message: str
    runnerup_message: str | None
    week_fill_message: str | None = None


def _make_bare_verifier(log_file: Path) -> ScreenLocker:
    """Build a minimal ``ScreenLocker`` for verification calls.

    Same ``object.__new__`` bypass ``screen_lock.py`` already uses for
    ``--status`` — just enough state for the verification mixins' methods
    to run, no Tk lock UI, no ``__init__`` side effects.
    """
    verifier = object.__new__(ScreenLocker)
    verifier.log_file = log_file
    verifier.workout_data = {}
    return verifier


def _backfill_week_and_apply_bonus(verifier: ScreenLocker) -> str | None:
    """Scan the current week for unlogged RunnerUp/StrongLifts and credit it.

    Each RunnerUp fill is credited through the same ``on_ingested`` callback
    as the timer's sync pass and every other ingestion source
    (``_sync_mixin._credit_ingested_workout``): +2h for the first counted
    workout of its day, +1h for each further one. The callback files the
    reward against the entry's OWN day, so a back-dated fill is not mis-dated
    the way routing it through ``_apply_workout_credit`` (always today) would.

    The StrongLifts fill keeps the weekly-surplus rule for now (+1h per
    workout above the weekly minimum); it is a separate source with its own
    dedup and is out of scope for the RunnerUp credit fix.

    Returns a human-readable summary if anything was filled, else ``None``.
    """
    prev_count = count_weekly_workouts(verifier.log_file)
    filled = verifier._scan_and_fill_week_runnerup(
        verifier.log_file, on_ingested=verifier._credit_ingested_workout
    )
    verifier.workout_data = {}
    sl_filled = verifier._try_fill_stronglifts_for_week(verifier.log_file)
    bonus = 0
    if sl_filled:
        new_count = count_weekly_workouts(verifier.log_file)
        extra = max(0, new_count - max(WEEKLY_WORKOUT_MINIMUM, prev_count + filled))
        # Day-aware: 0 per further unit on earned_time's ladder (2026-10-10).
        today = date.fromisoformat(today_str())
        bonus = extra * extra_minutes(earned_time.WORKOUT, today)
        if bonus > 0:
            verifier._adjust_shutdown_time_by(bonus)
    filled += sl_filled
    if not filled:
        return None
    plural = "workout" if filled == 1 else "workouts"
    message = f"Auto-filled {filled} {plural} from earlier this week."
    if bonus > 0:
        message += f" +{span(bonus)} shutdown time."
    return message


def _verify_phone_then_runnerup(verifier: ScreenLocker) -> PhoneCheckOutcome:
    """Check StrongLifts first, then RunnerUp, then backfill the rest of the week.

    Mirrors the locked screen's StrongLifts→RunnerUp chain (``_ui_flows.py``):
    a user may have run instead of lifted, so a failed phone check falls back
    to today's RunnerUp export. When neither source verifies *today*, this
    also scans the rest of the current ISO week for an unlogged, already-real
    (ADB-pulled, TCX/JSON-verified) workout — e.g. a run from yesterday that
    was never on-screen when the phone wasn't connected yet — and credits it
    directly. Only calls the verifier's ADB methods — never touches Tk — so
    it is safe to run inside a background thread.
    """
    phone_status, phone_message = verifier._verify_phone_workout()
    if phone_status == "verified":
        return PhoneCheckOutcome("phone_verified", phone_status, phone_message, None)
    runnerup_status, runnerup_message = verifier._verify_runnerup_workout()
    if runnerup_status == "verified":
        return PhoneCheckOutcome(
            "runnerup_verified", runnerup_status, phone_message, runnerup_message
        )
    week_fill_message = _backfill_week_and_apply_bonus(verifier)
    return PhoneCheckOutcome(
        None, runnerup_status, phone_message, runnerup_message, week_fill_message
    )


class PhoneCheckMixin:
    """The "Check Phone" button: verify today's workout, then credit it.

    Composed onto ``StatusWindow``, which supplies ``log_file``,
    ``verifier_factory``, ``root``, ``render`` and the result/message slots
    declared below.
    """

    log_file: Path
    verifier_factory: Callable[[Path], ScreenLocker]
    _phone_future: Future[PhoneCheckOutcome] | None
    _phone_check_result: tuple[str, str] | None
    _credit_message: str | None

    def _on_check_phone_clicked(self) -> None:
        """Verify today's workout (StrongLifts then RunnerUp) and apply its reward.

        Runs the two-step check in one background worker so the Tk loop stays
        responsive, then polls the future. Unlike the old display-only probe,
        a verified result here writes the entry and applies the shutdown bonus
        (see :meth:`_on_phone_check_result`). When neither source verifies
        today, the same worker also backfills any unlogged workout from
        earlier this week before giving up.
        """
        self._phone_check_result = None
        self._credit_message = None
        verifier = self.verifier_factory(self.log_file)
        executor = ThreadPoolExecutor(max_workers=1)
        self._phone_future = executor.submit(_verify_phone_then_runnerup, verifier)
        executor.shutdown(wait=False)
        self._poll_phone_check()

    def _poll_phone_check(self) -> None:
        """Poll the background verification future until it resolves."""
        if self._phone_future is not None and self._phone_future.done():
            self._on_phone_check_result(self._phone_future.result())
        else:
            self.root.after(500, self._poll_phone_check)

    def _on_phone_check_result(self, outcome: PhoneCheckOutcome) -> None:
        """Apply credit on a verified workout, else show a combined failure.

        On a verified *today* result this writes the entry and applies the
        reward via ``_apply_workout_credit`` — the same path the locked
        screen's ``unlock_screen`` and the "Log Manual Workout" button use,
        guarded against double-crediting on the same day. When the week-scan
        backfill found something instead (see ``_verify_phone_then_runnerup``),
        its message is shown as-is — that step already wrote the entry and
        applied its own bonus, applying credit again here would double it.
        When nothing verified or filled, both today-check messages are shown
        so the user knows why nothing counted.
        """
        if outcome.credited_type is not None:
            message = (
                outcome.runnerup_message
                if outcome.credited_type == "runnerup_verified"
                else outcome.phone_message
            )
            source_label = (
                "RunnerUp"
                if outcome.credited_type == "runnerup_verified"
                else "StrongLifts"
            )
            verifier = self.verifier_factory(self.log_file)
            verifier.workout_data = {
                "type": outcome.credited_type,
                "source": message or "",
            }
            credit = verifier._apply_workout_credit()
            self._credit_message = "\n".join(
                self._credit_result_lines(f"{source_label} verified: {message}", credit)
            )
        elif outcome.week_fill_message is not None:
            self._credit_message = outcome.week_fill_message
        else:
            self._phone_check_result = (
                outcome.status,
                (
                    f"StrongLifts: {outcome.phone_message} · "
                    f"RunnerUp: {outcome.runnerup_message}"
                ),
            )
        self.render(gather_status())

    def _credit_result_lines(
        self, header: str, credit: WorkoutCreditResult
    ) -> list[str]:
        """Human-readable outcome lines for an applied workout credit.

        Shared by the "Check Phone" verify path and the "Log Manual Workout"
        path so both report the reward identically: the base +2h shutdown push
        for the day's first workout, the +1h bonus for an additional same-day
        verified workout — or a note when this exact
        workout was already recorded today (idempotent, no new credit).
        """
        lines = [header]
        if credit.already_counted_today:
            lines.append("(Already recorded today — no additional credit.)")
            return lines
        if credit.shutdown_adjusted:
            lines.append("Shutdown time +2h later!")
        if credit.extra_bonus_delta > 0:
            lines.append(
                f"Extra workout today! +{span(credit.extra_bonus_delta)} tonight"
            )
        return lines