"""Тесты для layout_signature helpers (Issue #113, Phase 2.1).

Pure-Python, без БД и external calls.
"""

from __future__ import annotations

import pytest

from app.services.site_finder.layout_signature import (
    area_bin,
    layout_signature,
    room_bucket_from_flat,
)


@pytest.mark.parametrize(
    "rooms, flat_type, is_studio, expected",
    [
        (None, None, True, "studio"),
        (0, "Квартира-студия", False, "studio"),
        (0, "Квартира", None, "studio"),
        (1, "Квартира", None, "1"),
        (2, "Квартира", None, "2"),
        (3, "Квартира", False, "3"),
        (4, "Квартира", False, "4+"),
        (5, "Квартира", None, "4+"),
        (None, "Квартира", None, "1"),  # fallback
    ],
)
def test_room_bucket(
    rooms: int | None, flat_type: str | None, is_studio: bool | None, expected: str
) -> None:
    assert room_bucket_from_flat(rooms, flat_type, is_studio) == expected


@pytest.mark.parametrize(
    "area, expected",
    [
        (0.5, "<25"),
        (24.9, "<25"),
        (25.0, "25-40"),
        (39.99, "25-40"),
        (40.0, "40-60"),
        (59.99, "40-60"),
        (60.0, "60-80"),
        (79.99, "60-80"),
        (80.0, "80-100"),
        (99.99, "80-100"),
        (100.0, "100+"),
        (250.0, "100+"),
    ],
)
def test_area_bin(area: float, expected: str) -> None:
    assert area_bin(area) == expected


def test_layout_signature_deterministic() -> None:
    assert layout_signature("studio", "<25") == "studio__<25"
    assert layout_signature("4+", "100+") == "4+__100+"
    # Same input → same output
    sig1 = layout_signature("2", "40-60")
    sig2 = layout_signature("2", "40-60")
    assert sig1 == sig2


def test_room_bucket_is_studio_overrides_rooms() -> None:
    """is_studio=True beats any rooms value."""
    assert room_bucket_from_flat(3, "Квартира", True) == "studio"


def test_room_bucket_flat_type_studio_overrides_rooms() -> None:
    """flat_type='Квартира-студия' beats rooms=2."""
    assert room_bucket_from_flat(2, "Квартира-студия", None) == "studio"


def test_room_bucket_large_rooms() -> None:
    """rooms=10 → '4+'."""
    assert room_bucket_from_flat(10, "Квартира", False) == "4+"


def test_area_bin_boundary_exact() -> None:
    """Граничные значения попадают в правильный бакет (включение левой границы)."""
    assert area_bin(25.0) == "25-40"
    assert area_bin(40.0) == "40-60"
    assert area_bin(60.0) == "60-80"
    assert area_bin(80.0) == "80-100"
    assert area_bin(100.0) == "100+"


def test_layout_signature_format() -> None:
    """Сигнатура всегда содержит двойное подчёркивание-разделитель."""
    sig = layout_signature("1", "25-40")
    assert "__" in sig
    parts = sig.split("__")
    assert parts[0] == "1"
    assert parts[1] == "25-40"