"""Tests для §9.7 forecast-overlay моста (#982, 953-A) recommendation.py.

Покрывает:
  • PURE bridge-таблицы map_room_bucket / map_room_bucket_inverse — обе стороны +
    unknown→None + DRIFT-GUARD (сверка _FORECAST_TO_LIVE_BUCKET с инверсом
    analytics_queries._BUCKET_PRETTY — таблицы НЕ должны разъехаться).
  • map_class — сворачивание классов + None/unknown→None.
  • build_forecast_overlay через @patch:
      - demand_supply (cad_num задан): rank_segments замокан → маппинг RankedSegment →
        segment-dict, advisory True, DESC-порядок сохранён, unknown room-bucket отброшен.
      - demand_only (cad_num=None): market_metrics/demand_norm/macro замоканы → mode
        flips, обязательный warning, balance_units None, supply НЕ фабрикуется.
      - graceful: rank_segments бросает ValueError → пустой ranked_segments + warning,
        НЕ исключение.

Mock-based — живой БД не требуют (db = MagicMock; §9.x вызовы патчатся по месту
ЛОКАЛЬНОГО импорта внутри функций recommendation.py).
"""

from __future__ import annotations

from typing import Any
from unittest.mock import MagicMock, patch

import pytest

from app.services.forecasting.recommendation import (
    _FORECAST_TO_LIVE_BUCKET,
    build_forecast_overlay,
    map_class,
    map_room_bucket,
    map_room_bucket_inverse,
)
from app.services.forecasting.what_to_build import RankedSegment, WhatToBuildRanking

# Точки ЛОКАЛЬНОГО импорта внутри функций recommendation.py — патчим источник,
# чтобы перехватить вызов независимо от того, где импорт исполнится.
_RANK = "app.services.forecasting.what_to_build.rank_segments"
_METRICS = "app.services.site_finder.market_metrics.compute_market_metrics"
_NORM = "app.services.forecasting.demand_normalization.compute_demand_normalization"
_MACRO = "app.services.forecasting.macro_coefficient.compute_macro_coefficient"
_GET_MACRO = "app.services.forecasting.macro_series.get_monthly_macro"
_HOLD = "app.services.forecasting.demand_supply_forecast.hold_last_rate"


# ── PURE: map_room_bucket / map_room_bucket_inverse ───────────────────────────


class TestMapRoomBucket:
    def test_forward_all_five(self) -> None:
        assert map_room_bucket("Студии 15-30") == "1-Студия"
        assert map_room_bucket("1-к 30-45") == "2-1-к"
        assert map_room_bucket("2-к 45-60") == "3-2-к"
        assert map_room_bucket("3-к 60-80") == "4-3-к"
        assert map_room_bucket("80+ м²") == "5-80+ м²"

    def test_inverse_all_five(self) -> None:
        assert map_room_bucket_inverse("1-Студия") == "Студии 15-30"
        assert map_room_bucket_inverse("2-1-к") == "1-к 30-45"
        assert map_room_bucket_inverse("3-2-к") == "2-к 45-60"
        assert map_room_bucket_inverse("4-3-к") == "3-к 60-80"
        assert map_room_bucket_inverse("5-80+ м²") == "80+ м²"

    def test_round_trip_forward_then_inverse(self) -> None:
        for forecast in _FORECAST_TO_LIVE_BUCKET:
            assert map_room_bucket_inverse(map_room_bucket(forecast)) == forecast

    def test_unknown_forward_none(self) -> None:
        assert map_room_bucket("чердак") is None

    def test_unknown_inverse_none(self) -> None:
        assert map_room_bucket_inverse("9-чердак") is None

    def test_none_passthrough(self) -> None:
        assert map_room_bucket(None) is None
        assert map_room_bucket_inverse(None) is None


class TestBucketTableDriftGuard:
    """_FORECAST_TO_LIVE_BUCKET ДОЛЖНА быть точным инверсом analytics_queries._BUCKET_PRETTY.

    Если кто-то поменяет один словарь и забудет другой (дублируем 5 литералов ради
    разрыва import-цикла) — этот тест падает первым.
    """

    def test_is_exact_inverse_of_bucket_pretty(self) -> None:
        from app.services.analytics_queries import _BUCKET_PRETTY

        expected_inverse = {pretty: bid for bid, pretty in _BUCKET_PRETTY.items()}
        assert _FORECAST_TO_LIVE_BUCKET == expected_inverse

    def test_same_cardinality(self) -> None:
        from app.services.analytics_queries import _BUCKET_PRETTY

        assert len(_FORECAST_TO_LIVE_BUCKET) == len(_BUCKET_PRETTY) == 5


# ── PURE: map_class ───────────────────────────────────────────────────────────


class TestMapClass:
    @pytest.mark.parametrize(
        ("live", "expected"),
        [
            ("Comfort", "комфорт"),
            ("Comfort+", "комфорт"),
            ("Business", "бизнес"),
            ("Elite", "бизнес"),
            ("Economy", "эконом"),
        ],
    )
    def test_folding(self, live: str, expected: str) -> None:
        assert map_class(live) == expected

    def test_none_to_none(self) -> None:
        assert map_class(None) is None

    def test_unknown_to_none(self) -> None:
        assert map_class("Luxury++") is None


# ── Helpers для мок-сегментов demand_supply ───────────────────────────────────


def _ranked(
    *,
    room_bucket: str | None,
    deficit_index: float,
    obj_class: str = "комфорт",
    balance_units: float | None = 12.0,
    confidence: str = "medium",
) -> RankedSegment:
    return RankedSegment(
        segment={
            "obj_class": obj_class,
            "room_bucket": room_bucket,
            "district": "Ленинский",
            "price_bucket": None,
        },
        deficit_index=deficit_index,
        balance_units=balance_units,
        confidence=confidence,  # type: ignore[arg-type]
    )


def _ranking(ranked: list[RankedSegment]) -> WhatToBuildRanking:
    return WhatToBuildRanking(
        district="Ленинский",
        cad_num="66:41:0000000:1",
        horizon_months=12,
        ranked=ranked,
        n_cells_scanned=len(ranked),
        n_cells_ranked=len(ranked),
        generated_advisory=True,
    )


# ── build_forecast_overlay: demand_supply (cad_num задан) ──────────────────────


class TestDemandSupplyOverlay:
    def test_mode_and_advisory(self) -> None:
        ranking = _ranking([_ranked(room_bucket="2-к 45-60", deficit_index=0.5)])
        with patch(_RANK, return_value=ranking):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class="Comfort",
            )
        assert out["mode"] == "demand_supply"
        assert out["advisory"] is True
        assert out["horizon_months"] == 12

    def test_maps_segment_buckets_to_live(self) -> None:
        ranking = _ranking(
            [
                _ranked(room_bucket="Студии 15-30", deficit_index=0.9),
                _ranked(room_bucket="2-к 45-60", deficit_index=0.3),
            ]
        )
        with patch(_RANK, return_value=ranking):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class=None,
            )
        buckets = [s["bucket"] for s in out["ranked_segments"]]
        assert buckets == ["1-Студия", "3-2-к"]

    def test_desc_order_preserved(self) -> None:
        # rank_segments уже отдаёт DESC; overlay не переупорядочивает.
        ranking = _ranking(
            [
                _ranked(room_bucket="80+ м²", deficit_index=0.8),
                _ranked(room_bucket="1-к 30-45", deficit_index=0.2),
                _ranked(room_bucket="3-к 60-80", deficit_index=-0.4),
            ]
        )
        with patch(_RANK, return_value=ranking):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class=None,
            )
        indices = [s["deficit_index"] for s in out["ranked_segments"]]
        assert indices == [0.8, 0.2, -0.4]

    def test_fields_passed_through(self) -> None:
        ranking = _ranking(
            [
                _ranked(
                    room_bucket="2-к 45-60",
                    deficit_index=0.55,
                    obj_class="бизнес",
                    balance_units=33.0,
                    confidence="medium",
                )
            ]
        )
        with patch(_RANK, return_value=ranking):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=9,
                target_class="Business",
            )
        seg = out["ranked_segments"][0]
        assert seg["obj_class"] == "бизнес"
        assert seg["deficit_index"] == 0.55
        assert seg["balance_units"] == 33.0
        assert seg["confidence"] == "medium"

    def test_unknown_room_bucket_dropped(self) -> None:
        ranking = _ranking(
            [
                _ranked(room_bucket="2-к 45-60", deficit_index=0.5),
                _ranked(room_bucket="мансарда", deficit_index=0.9),  # неизвестный → drop
            ]
        )
        with patch(_RANK, return_value=ranking):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class=None,
            )
        buckets = [s["bucket"] for s in out["ranked_segments"]]
        assert buckets == ["3-2-к"]

    def test_class_mapped_into_rank_kwargs(self) -> None:
        ranking = _ranking([_ranked(room_bucket="2-к 45-60", deficit_index=0.5)])
        with patch(_RANK, return_value=ranking) as mock_rank:
            build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class="Elite",
            )
        # Elite → бизнес, передаётся ранкеру как classes=["бизнес"].
        assert mock_rank.call_args.kwargs["classes"] == ["бизнес"]

    def test_no_class_omits_classes_kwarg(self) -> None:
        # target_class=None → classes НЕ передаётся (движковый дефолт _DEFAULT_CLASSES).
        ranking = _ranking([_ranked(room_bucket="2-к 45-60", deficit_index=0.5)])
        with patch(_RANK, return_value=ranking) as mock_rank:
            build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class=None,
            )
        assert "classes" not in mock_rank.call_args.kwargs

    def test_empty_ranking_yields_warning(self) -> None:
        with patch(_RANK, return_value=_ranking([])):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class=None,
            )
        assert out["ranked_segments"] == []
        assert out["warnings"]


# ── build_forecast_overlay: graceful (rank_segments бросает) ───────────────────


class TestDemandSupplyGraceful:
    def test_value_error_yields_empty_plus_warning_no_raise(self) -> None:
        with patch(_RANK, side_effect=ValueError("нет геометрии участка")):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num="66:41:0000000:1",
                horizon_months=12,
                target_class=None,
            )
        assert out["mode"] == "demand_supply"
        assert out["advisory"] is True
        assert out["ranked_segments"] == []
        assert out["warnings"]


# ── build_forecast_overlay: demand_only (cad_num=None) ─────────────────────────


def _mk_metrics(unit_velocity: float | None) -> MagicMock:
    m = MagicMock()
    m.unit_velocity = unit_velocity
    return m


def _mk_coef(coefficient: float) -> MagicMock:
    c = MagicMock()
    c.coefficient = coefficient
    return c


class TestDemandOnlyOverlay:
    def test_mode_flips_when_no_cad_num(self) -> None:
        with (
            patch(_METRICS, return_value=_mk_metrics(4.0)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
            patch(_NORM, return_value=_mk_coef(1.0)),
            patch(_MACRO, return_value=_mk_coef(1.0)),
        ):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class=None,
            )
        assert out["mode"] == "demand_only"
        assert out["advisory"] is True

    def test_mandatory_supply_warning_present(self) -> None:
        with (
            patch(_METRICS, return_value=_mk_metrics(4.0)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
            patch(_NORM, return_value=_mk_coef(1.0)),
            patch(_MACRO, return_value=_mk_coef(1.0)),
        ):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class=None,
            )
        assert any("supply/конкуренты НЕ учтены" in w for w in out["warnings"])

    def test_balance_units_always_none_no_fabricated_supply(self) -> None:
        with (
            patch(_METRICS, return_value=_mk_metrics(4.0)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
            patch(_NORM, return_value=_mk_coef(1.0)),
            patch(_MACRO, return_value=_mk_coef(1.0)),
        ):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class=None,
            )
        assert out["ranked_segments"], "ожидали 5 ранжированных форматов"
        assert all(s["balance_units"] is None for s in out["ranked_segments"])

    def test_confidence_low_for_all_segments(self) -> None:
        with (
            patch(_METRICS, return_value=_mk_metrics(4.0)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
            patch(_NORM, return_value=_mk_coef(1.0)),
            patch(_MACRO, return_value=_mk_coef(1.0)),
        ):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class=None,
            )
        assert all(s["confidence"] == "low" for s in out["ranked_segments"])

    def test_deficit_index_is_pace_proxy_zero_to_one(self) -> None:
        # Разные §9.5-коэффициенты per вызов → разные pace → deficit_index = pace/max ∈ (0,1].
        macro_coeffs = iter([_mk_coef(c) for c in (0.5, 1.0, 1.5, 1.2, 0.8)])
        with (
            patch(_METRICS, return_value=_mk_metrics(4.0)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
            patch(_NORM, return_value=_mk_coef(1.0)),
            patch(_MACRO, side_effect=lambda *a, **k: next(macro_coeffs)),
        ):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class=None,
            )
        indices = [s["deficit_index"] for s in out["ranked_segments"]]
        assert max(indices) == pytest.approx(1.0)  # топ нормирован к 1.0
        assert all(0.0 < i <= 1.0 for i in indices)
        # DESC по pace.
        assert indices == sorted(indices, reverse=True)

    def test_no_velocity_yields_empty_plus_warning(self) -> None:
        # base_pace None (нет §9.2 темпа) → НЕ фабрикуем сигнал, пустой ранкинг + warning.
        with (
            patch(_METRICS, return_value=_mk_metrics(None)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
        ):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class=None,
            )
        assert out["mode"] == "demand_only"
        assert out["ranked_segments"] == []
        assert out["warnings"]

    def test_five_default_room_buckets_ranked(self) -> None:
        with (
            patch(_METRICS, return_value=_mk_metrics(4.0)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
            patch(_NORM, return_value=_mk_coef(1.0)),
            patch(_MACRO, return_value=_mk_coef(1.0)),
        ):
            out = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class=None,
            )
        buckets = {s["bucket"] for s in out["ranked_segments"]}
        assert buckets == {"1-Студия", "2-1-к", "3-2-к", "4-3-к", "5-80+ м²"}

    def test_overlay_validates_against_schema(self) -> None:
        # Sanity: demand_only-выход проходит RecommendForecastOverlay-валидацию.
        from app.schemas.recommend import RecommendForecastOverlay

        with (
            patch(_METRICS, return_value=_mk_metrics(4.0)),
            patch(_GET_MACRO, return_value=[]),
            patch(_HOLD, return_value={12: 18.0}),
            patch(_NORM, return_value=_mk_coef(1.0)),
            patch(_MACRO, return_value=_mk_coef(1.0)),
        ):
            out: dict[str, Any] = build_forecast_overlay(
                MagicMock(),
                district="Ленинский",
                cad_num=None,
                horizon_months=12,
                target_class="Comfort",
            )
        model = RecommendForecastOverlay.model_validate(out)
        assert model.mode == "demand_only"
        assert model.advisory is True