"""배수 추천 구조물·관경과 자동 배치 주입 (PLAN 2026-08-17 「4」).

추천 근거는 **유량(유효직경)뿐**이다 — 계곡 횡단경사·하천 차수는 지형 계산이 필요해
이번 범위에서 뺐고 화면이 "현장 확인"으로 안내한다(사용자 확정).

  D ≤ 1,500㎜        배관 (레지스트리 선택지로 스냅, 하한 800㎜)
  1,500 < D ≤ 2,000  BOX암거 후보
  D > 2,000㎜        세월교·물넘이 검토
"""

import pytest

from B04_PreProcess.B04_PreProcess_Router_Basins import _apply_recommendations
from B05_Profile.B05_Profile_Structures_Schema import load_structure_types
from common_util.common_util_drainage_detail import (
    DrainageDetail,
    WatershedBasin,
    recommend_structure,
)
from common_util.common_util_drainage_pipes import (
    PIPE_FACILITY_BOX,
    PIPE_FACILITY_FORD_BRIDGE,
    PIPE_FACILITY_PIPE,
    PIPE_SOURCE_STREAM,
    PIPE_SOURCE_USER,
    PipePoint,
)
from config.config_system import DRAINAGE_RECOMMEND_DIAMETERS_MM


# ── 추천 판정 ──────────────────────────────────────────────────────────────


@pytest.mark.parametrize(
    "diameter_mm, expected",
    [
        (None, (PIPE_FACILITY_PIPE, None)),  # 강우량표 없음 — 관경 미정
        (300.0, (PIPE_FACILITY_PIPE, 800)),  # 하한 800㎜ 아래로는 안 내린다
        (800.0, (PIPE_FACILITY_PIPE, 800)),
        (800.1, (PIPE_FACILITY_PIPE, 1000)),  # 규격을 넘으면 바로 위 규격
        (1000.0, (PIPE_FACILITY_PIPE, 1000)),
        (1100.0, (PIPE_FACILITY_PIPE, 1200)),
        (1500.0, (PIPE_FACILITY_PIPE, 1500)),  # 경계값은 아직 배관
        (1500.1, (PIPE_FACILITY_BOX, None)),  # 초과 → BOX암거 후보
        (2000.0, (PIPE_FACILITY_BOX, None)),  # 경계값은 아직 BOX암거
        (2000.1, (PIPE_FACILITY_FORD_BRIDGE, None)),  # 관 최대 규격 초과
    ],
)
def test_recommend_structure_thresholds(diameter_mm, expected):
    assert recommend_structure(diameter_mm) == expected


def test_recommended_sizes_match_registry_choices():
    """추천 관경은 폼에서 고를 수 있어야 한다 — 레지스트리 선택지와 같은 목록."""
    by_id = {item.type_id: item for item in load_structure_types()}
    options = {option.key: option for option in by_id["pipe"].options}
    choices = [int(value) for value in options["pipe_diameter_mm"].choices]
    assert list(DRAINAGE_RECOMMEND_DIAMETERS_MM) == choices


# ── 자동 배치 주입 ─────────────────────────────────────────────────────────


def _detail(*basins: WatershedBasin) -> DrainageDetail:
    detail = DrainageDetail.__new__(DrainageDetail)
    detail.basins = list(basins)
    return detail


def _basin(chainage: float, facility: str, diameter: int | None) -> WatershedBasin:
    return WatershedBasin(
        index=1,
        chainage_m=chainage,
        outlet_x=0.0,
        outlet_y=0.0,
        recommended_facility=facility,
        recommended_diameter_mm=diameter,
    )


def test_auto_pipe_gets_recommended_diameter():
    """자동 배치 관은 폼을 열지 않아도 유역 유량에 맞는 관경을 갖는다."""
    points = [PipePoint(chainage_m=100.0, source=PIPE_SOURCE_STREAM)]
    _apply_recommendations(_detail(_basin(100.0, PIPE_FACILITY_PIPE, 1200)), points)
    assert points[0].options == {"pipe_diameter_mm": 1200}
    assert points[0].facility == PIPE_FACILITY_PIPE


def test_auto_point_switches_facility_to_box():
    """추천이 BOX암거면 시설 종류까지 바꾼다(관경은 붙이지 않는다)."""
    points = [PipePoint(chainage_m=100.0, source=PIPE_SOURCE_STREAM)]
    _apply_recommendations(_detail(_basin(100.0, PIPE_FACILITY_BOX, None)), points)
    assert points[0].facility == PIPE_FACILITY_BOX
    assert points[0].options is None


def test_user_placed_point_is_never_overwritten():
    """사용자가 직접 놓거나 옮긴 관은 재계산이 건드리지 않는다."""
    points = [PipePoint(chainage_m=100.0, source=PIPE_SOURCE_USER)]
    _apply_recommendations(_detail(_basin(100.0, PIPE_FACILITY_BOX, None)), points)
    assert points[0].facility == PIPE_FACILITY_PIPE
    assert points[0].options is None


def test_existing_option_is_kept():
    """설계자가 고른 관경을 추천이 되돌리면 안 된다 — 빈칸만 채운다."""
    points = [
        PipePoint(
            chainage_m=100.0,
            source=PIPE_SOURCE_STREAM,
            options={"pipe_diameter_mm": 800},
        )
    ]
    _apply_recommendations(_detail(_basin(100.0, PIPE_FACILITY_PIPE, 1500)), points)
    assert points[0].options == {"pipe_diameter_mm": 800}


def test_already_chosen_facility_is_kept():
    """이미 다른 시설로 바꿔 둔 지점은 추천이 되돌리지 않는다."""
    points = [
        PipePoint(
            chainage_m=100.0,
            source=PIPE_SOURCE_STREAM,
            facility=PIPE_FACILITY_FORD_BRIDGE,
        )
    ]
    _apply_recommendations(_detail(_basin(100.0, PIPE_FACILITY_BOX, None)), points)
    assert points[0].facility == PIPE_FACILITY_FORD_BRIDGE


def test_point_without_basin_is_untouched():
    """담당 유역이 없는 관(유역 미산출)은 그대로 둔다."""
    points = [PipePoint(chainage_m=500.0, source=PIPE_SOURCE_STREAM)]
    _apply_recommendations(_detail(_basin(100.0, PIPE_FACILITY_PIPE, 1200)), points)
    assert points[0].options is None