"""Freshness-монитор данных deals по max(deal_date) — #2212.

Покрывает:
  1. Чистую логику evaluate_deals_freshness (frozen now, без БД):
     - нет алерта: 2026Q1 @ 2026-07-02 (порог 2026-08-15 не наступил);
     - алерт:     2026Q1 @ 2026-08-20 (days_overdue=5);
     - граница порога (== threshold → нет алерта; +1 день → алерт);
     - кастомный lag_allowance_days.
  2. check_deals_freshness с FakeDB (no-alert / alert / empty→mark_failed).
  3. Свойства миграции 162 (по образцу test_deactivate_stale_listings).
  4. Регистрацию в kit product_handlers (registry остаётся зелёным).
"""

from __future__ import annotations

import os
import re
from datetime import UTC, date, datetime
from pathlib import Path
from typing import Any

import pytest

os.environ.setdefault("DATABASE_URL", "postgresql+psycopg://test:test@localhost:5432/test")

from app.services.product_handlers import build_product_handlers
from app.tasks import deals_freshness_monitor as mon

_SQL_DIR = Path(__file__).resolve().parents[1] / "data" / "sql"
_MIGRATION_162 = _SQL_DIR / "162_seed_deals_freshness_monitor.sql"

# max(deal_date) = 2026Q1 label (проверено на проде 2026-07-02).
_Q1_2026 = date(2026, 1, 1)


# ── evaluate_deals_freshness (чистая логика, frozen now) ──────────────────────


def _now(y: int, m: int, d: int) -> datetime:
    return datetime(y, m, d, tzinfo=UTC)


def test_no_alert_now_2026_07_02() -> None:
    """Сейчас: 2026Q1 @ 2026-07-02 — порог просрочки 2026-08-15 не наступил."""
    v = mon.evaluate_deals_freshness(_Q1_2026, _now(2026, 7, 2))
    assert v.overdue is False
    assert v.days_overdue == 0
    assert v.latest_q_end == date(2026, 4, 1)
    assert v.overdue_threshold == date(2026, 8, 15)


def test_alert_2026_08_20() -> None:
    """К 2026-08-20 Q2 не импортирован — алерт, просрочка 5 дней (порог 2026-08-15)."""
    v = mon.evaluate_deals_freshness(_Q1_2026, _now(2026, 8, 20))
    assert v.overdue is True
    assert v.days_overdue == 5


def test_threshold_boundary_exact_no_alert() -> None:
    """Ровно в день порога (2026-08-15) алерта ещё нет (строгое >)."""
    v = mon.evaluate_deals_freshness(_Q1_2026, _now(2026, 8, 15))
    assert v.overdue is False
    assert v.days_overdue == 0


def test_threshold_boundary_next_day_alert() -> None:
    """Порог + 1 день (2026-08-16) — первый алерт, просрочка 1 день."""
    v = mon.evaluate_deals_freshness(_Q1_2026, _now(2026, 8, 16))
    assert v.overdue is True
    assert v.days_overdue == 1


def test_custom_lag_allowance_shifts_threshold() -> None:
    """lag_allowance_days=0 сдвигает порог на конец следующего квартала (2026-07-01)."""
    v = mon.evaluate_deals_freshness(_Q1_2026, _now(2026, 7, 2), lag_allowance_days=0)
    assert v.overdue_threshold == date(2026, 7, 1)
    assert v.overdue is True
    assert v.days_overdue == 1


def test_add_months_quarter_starts() -> None:
    assert mon._add_months(date(2026, 1, 1), 3) == date(2026, 4, 1)
    assert mon._add_months(date(2026, 1, 1), 6) == date(2026, 7, 1)
    assert mon._add_months(date(2026, 10, 1), 3) == date(2027, 1, 1)


def test_add_months_end_of_month_clamp() -> None:
    # 31 янв + 1 мес → 28 фев (зажим на конец месяца).
    assert mon._add_months(date(2026, 1, 31), 1) == date(2026, 2, 28)


# ── check_deals_freshness (FakeDB) ────────────────────────────────────────────


class _Row:
    def __init__(self, latest: date | None) -> None:
        self.latest = latest


class _FakeResult:
    def __init__(self, latest: date | None) -> None:
        self._latest = latest

    def first(self) -> _Row:
        return _Row(self._latest)


class _FakeDB:
    def __init__(self, latest: date | None) -> None:
        self._latest = latest
        self.rolled_back = False

    def execute(self, stmt: Any, params: dict[str, Any] | None = None) -> _FakeResult:
        return _FakeResult(self._latest)

    def rollback(self) -> None:
        self.rolled_back = True


def _patch_runs(monkeypatch: pytest.MonkeyPatch) -> dict[str, Any]:
    calls: dict[str, Any] = {"done": None, "failed": None, "heartbeat": 0}
    monkeypatch.setattr(
        mon.runs_mod,
        "update_heartbeat",
        lambda *a, **k: calls.__setitem__("heartbeat", calls["heartbeat"] + 1),
    )
    monkeypatch.setattr(
        mon.runs_mod,
        "mark_done",
        lambda _db, run_id, counters: calls.__setitem__("done", dict(counters)),
    )
    monkeypatch.setattr(
        mon.runs_mod,
        "mark_failed",
        lambda _db, run_id, err, counters: calls.__setitem__("failed", err),
    )
    return calls


def test_check_no_alert_marks_done(monkeypatch: pytest.MonkeyPatch) -> None:
    calls = _patch_runs(monkeypatch)
    db = _FakeDB(_Q1_2026)
    out = mon.check_deals_freshness(db, run_id=1, params={}, now=_now(2026, 7, 2))  # type: ignore[arg-type]
    assert out == {"latest_year": 2026, "latest_quarter": 1, "days_overdue": 0, "alert": 0}
    assert calls["done"] == out
    assert calls["failed"] is None


def test_check_overdue_marks_done_with_alert(monkeypatch: pytest.MonkeyPatch) -> None:
    calls = _patch_runs(monkeypatch)
    db = _FakeDB(_Q1_2026)
    out = mon.check_deals_freshness(db, run_id=2, params={}, now=_now(2026, 8, 20))  # type: ignore[arg-type]
    assert out["alert"] == 1
    assert out["days_overdue"] == 5
    # Монитор НЕ падает при алерте — прогон done, а не failed.
    assert calls["done"] == out
    assert calls["failed"] is None


def test_check_empty_deals_marks_failed(monkeypatch: pytest.MonkeyPatch) -> None:
    calls = _patch_runs(monkeypatch)
    db = _FakeDB(None)
    out = mon.check_deals_freshness(db, run_id=3, params={}, now=_now(2026, 7, 2))  # type: ignore[arg-type]
    assert out["alert"] == 0
    assert calls["done"] is None
    assert calls["failed"] is not None


def test_check_reads_lag_from_params(monkeypatch: pytest.MonkeyPatch) -> None:
    _patch_runs(monkeypatch)
    db = _FakeDB(_Q1_2026)
    # lag=0 → порог 2026-07-01 → @2026-07-02 уже просрочено.
    out = mon.check_deals_freshness(
        db, run_id=4, params={"lag_allowance_days": 0}, now=_now(2026, 7, 2)
    )  # type: ignore[arg-type]
    assert out["alert"] == 1


# ── Миграция 162 ──────────────────────────────────────────────────────────────


def test_migration_162_exists() -> None:
    assert _MIGRATION_162.is_file(), f"missing migration: {_MIGRATION_162}"


def test_migration_162_seeds_source() -> None:
    sql = _MIGRATION_162.read_text("utf-8")
    assert "'deals_freshness_monitor'" in sql


def test_migration_162_enabled_true() -> None:
    sql = _MIGRATION_162.read_text("utf-8")
    assert "true" in sql


def test_migration_162_is_idempotent() -> None:
    sql = _MIGRATION_162.read_text("utf-8")
    assert "ON CONFLICT (source) DO NOTHING" in sql


def test_migration_162_is_transactional() -> None:
    sql = _MIGRATION_162.read_text("utf-8")
    assert "BEGIN;" in sql
    assert "COMMIT;" in sql


def test_migration_162_window_8_to_9_utc() -> None:
    sql = _MIGRATION_162.read_text("utf-8")
    assert re.search(r"\b8\b", sql), "window_start_hour 8 missing"
    assert re.search(r"\b9\b", sql), "window_end_hour 9 missing"


def test_migration_162_lag_allowance_45() -> None:
    sql = _MIGRATION_162.read_text("utf-8")
    assert "lag_allowance_days" in sql
    assert "45" in sql


def test_migration_162_no_psycopg_trap() -> None:
    sql = _MIGRATION_162.read_text("utf-8")
    assert not re.search(r":\w+::", sql)


# ── Регистрация в kit registry ─────────────────────────────────────────────────


def test_kit_product_handler_registered() -> None:
    # ctx не нужен для сборки dict ключей — build_product_handlers его не замыкает.
    handlers = build_product_handlers(ctx=None)  # type: ignore[arg-type]
    assert "deals_freshness_monitor" in handlers