"""초기 계획노선 갈래(PLAN 20장) — `B05_Profile_Engine_RouteInitial` 합성 지형 시험.

    ./venv/Scripts/python.exe -m pytest resources/tester/test_route_initial.py -q

공통 제약(종단기울기 상한 · 최소 곡선반지름 · 계류 이격)은 넘지 못함 — 지형상 불가능할 때만
`metrics.violations` 에 측점 · 값 · 사유로 뜨고 `over_limit.total` 은 그 수와 같다.
예상노선 추적(follow)은 전처리 초기값과 같은 선 — 제약 탐색 없이 넘은 곳만 목록(PLAN 23-1).
갈래는 제 목표 비교값이 가장 좋은 후보 — 실프로젝트(랩탑_보조 · 읽기만)에서 갈래가 갈림.
"""

from pathlib import Path

import numpy as np
import pytest
from shapely.geometry import LineString

from B05_Profile.B05_Profile_Engine_RouteInitial import (
    MODES,
    PENDING,
    STREAM_OFFSET_M,
    Terrain,
    generate_initial_route,
    read_initial_choice,
    resolve_weights,
    stream_lines,
    write_initial_choice,
)
from B05_Profile.B05_Profile_Engine_RouteInitial_Metrics import grade_line, station_label
from common_util.common_util_route_polyline import build_planned_polyline

SEARCHED = [mode for mode in MODES if mode != "follow"]

GRADE = 0.14
RADIUS = 12.0


def _terrain(z_of) -> Terrain:
    x = np.arange(0.0, 802.0, 2.0)
    y = np.arange(0.0, 402.0, 2.0)
    xx, yy = np.meshgrid(x, y)
    return Terrain(x, y, z_of(xx, yy), np.ones(xx.shape, dtype=bool))


def _line(y: float) -> list[tuple[float, float]]:
    return [(float(x), y) for x in np.arange(50.0, 752.0, 4.0)]


def _run(terrain: Terrain, mode: str, streams=(), weights=None) -> dict:
    return generate_initial_route(
        _line(200.0),
        terrain,
        list(streams),
        mode=mode,
        weights=weights,
        max_grade=GRADE,
        min_radius_m=RADIUS,
    )


def _kept(result: dict) -> None:
    """제약을 지켰거나, 못 지킨 곳이 목록에 있고 수가 같음."""
    metrics = result["metrics"]
    assert metrics["over_limit"]["total"] == len(metrics["violations"])
    if not metrics["violations"]:
        assert metrics["max_grade_pct"] <= GRADE * 100.0 + 1e-6
        assert result["relaxed"] is False
    for curve in result["curves"]:
        assert curve["radius_m"] >= RADIUS - 1e-6 or curve["violations"]


@pytest.fixture(scope="module")
def hill() -> Terrain:
    """가운데 솟은 언덕(높이 40 m) — 곧은 예상노선이 꼭대기(측면 27 %)를 넘는다."""
    return _terrain(
        lambda xx, yy: 40.0 * np.exp(-((xx - 400.0) ** 2 + (yy - 200.0) ** 2) / 90.0**2)
    )


@pytest.mark.parametrize("mode", SEARCHED)
def test_every_mode_keeps_grade_limit_on_hill(hill: Terrain, mode: str) -> None:
    result = _run(hill, mode)
    _kept(result)
    metrics = result["metrics"]
    assert metrics["over_limit"]["total"] == 0
    assert metrics["max_grade_pct"] <= GRADE * 100.0 + 1e-6
    # 기점 · 종점은 옮기지 않고 복도(100 m) 밖으로 안 나감
    assert result["planned"][0] == [50.0, 200.0]
    assert result["planned"][-1] == [750.0, 200.0]
    assert metrics["offset_max_m"] <= result["criteria"]["corridor_m"] + 4.0


def test_follow_is_initial_polyline_and_lists_violations(hill: Terrain) -> None:
    """추종 = 전처리 초기값 규칙(`build_planned_polyline` 기본값) — 언덕을 넘는 곳은 목록에."""
    result = _run(hill, "follow")
    initial = build_planned_polyline(_line(200.0), min_radius_m=RADIUS)
    assert result["planned"] == [[round(x, 4), round(y, 4)] for x, y in initial.vertices]
    assert result["nodes"] == [node.as_dict() for node in initial.nodes]
    assert result["relaxed"] is False and result["terrain_bound_pct"] is None
    grades = [v for v in result["metrics"]["violations"] if v["kind"] == "grade"]
    assert grades and all("예상노선 추적" in v["reason"] for v in grades)
    assert result["metrics"]["over_limit"]["total"] == len(result["metrics"]["violations"])


def _earth(result: dict) -> float:
    return result["metrics"]["cut_m3"] + result["metrics"]["fill_m3"]


def test_each_branch_best_at_own_goal(hill: Terrain) -> None:
    """토공 최소 = 절성토 가장 적음 · 기울기 순한 = 최대 기울기 가장 낮음(같은 후보 묶음)."""
    runs = {mode: _run(hill, mode) for mode in SEARCHED}
    assert all(_earth(runs["earthwork"]) <= _earth(r) + 1e-6 for r in runs.values())
    top = runs["gentle"]["metrics"]["max_grade_pct"]
    assert all(top <= r["metrics"]["max_grade_pct"] + 1e-6 for r in runs.values())


# 비중 끝값 · 단조(PLAN 23-3e) — 예상 · 토공 · 기울기 한쪽 100 이면 그 갈래와 같은 선
ENDS = {
    "follow": {"expected": 100, "earthwork": 0, "grade": 0},
    "earthwork": {"expected": 0, "earthwork": 100, "grade": 0},
    "gentle": {"expected": 0, "earthwork": 0, "grade": 100},
}
# 예상 100 → 0(나머지 반반) · 기울기 100 → 토공 100
TOWARD_OTHERS = [
    (100, 0, 0),
    (90, 5, 5),
    (75, 12.5, 12.5),
    (50, 25, 25),
    (25, 37.5, 37.5),
    (0, 50, 50),
]
TOWARD_EARTH = [(0, 0, 100), (0, 25, 75), (0, 50, 50), (0, 75, 25), (0, 100, 0)]


def _gap(first: dict, second: dict) -> float:
    return LineString(first["planned"]).hausdorff_distance(LineString(second["planned"]))


def _check_weight_ends(run) -> None:
    for mode, weights in ENDS.items():
        end, own = run("weighted", weights), run(mode)
        assert _gap(end, own) < 0.01, (mode, _gap(end, own))
        assert end["nodes"] == own["nodes"]
        assert end["metrics"]["length_m"] == own["metrics"]["length_m"]


def _check_weight_monotone(run) -> None:
    """비중을 한쪽으로 옮기면 그 목표 값은 나빠지지 않음(후보가 같으니 가중합 최소의 성질)."""

    def metrics(steps):
        keys = ("expected", "earthwork", "grade")
        return [run("weighted", dict(zip(keys, step)))["metrics"] for step in steps]

    offsets = [m["offset_avg_m"] for m in metrics(TOWARD_OTHERS)]
    assert offsets == sorted(offsets), offsets
    earth = metrics(TOWARD_EARTH)
    cuts = [m["cut_m3"] + m["fill_m3"] for m in earth]
    tops = [m["max_grade_pct"] for m in earth]
    assert cuts == sorted(cuts, reverse=True), cuts
    assert tops == sorted(tops), tops


def test_weight_ends_match_branches(hill: Terrain) -> None:
    _check_weight_ends(lambda mode, weights=None: _run(hill, mode, weights=weights))


def test_weight_moves_monotone(hill: Terrain) -> None:
    _check_weight_monotone(lambda mode, weights=None: _run(hill, mode, weights=weights))


def test_follow_stays_on_expected_where_allowed() -> None:
    """고른 경사(2 %) — 추종은 예상노선을 그대로(격자 칸 반 안쪽)."""
    ramp = _terrain(lambda xx, yy: 0.02 * xx)
    result = _run(ramp, "follow")
    _kept(result)
    assert result["metrics"]["offset_max_m"] <= 3.0


def test_weighted_expected_share_pulls_route_back(hill: Terrain) -> None:
    near = _run(hill, "weighted", weights={"expected": 90, "earthwork": 5, "grade": 5})
    far = _run(hill, "weighted", weights={"expected": 10, "earthwork": 45, "grade": 45})
    assert near["metrics"]["offset_avg_m"] <= far["metrics"]["offset_avg_m"]


def test_stream_offset_is_hard() -> None:
    """평지 · 예상노선 20 m 옆을 나란히 흐르는 소하천 — 모든 갈래가 버퍼를 비켜 감."""
    flat = _terrain(lambda xx, yy: np.zeros_like(xx))
    stream = [[(0.0, 220.0), (800.0, 220.0)]]
    for mode in SEARCHED:
        result = _run(flat, mode, streams=stream)
        _kept(result)
        assert result["metrics"]["over_limit"]["stream"] == 0
        assert result["metrics"]["offset_avg_m"] > STREAM_OFFSET_M - 20.0 - 30.0


def test_stream_crossing_is_allowed() -> None:
    flat = _terrain(lambda xx, yy: np.zeros_like(xx))
    crossing = [[(400.0, 0.0), (400.0, 400.0)]]
    result = _run(flat, "follow", streams=crossing)
    _kept(result)
    assert result["metrics"]["over_limit"]["total"] == 0


def test_terrain_impossible_is_listed() -> None:
    """복도 전체를 가로지르는 20 m 벽 — 어떤 길도 상한을 넘음 → 목록 · 사유 · 막은 기울기."""
    wall = _terrain(lambda xx, yy: np.where(xx > 400.0, 20.0, 0.0))
    result = _run(wall, "weighted")
    _kept(result)
    assert result["relaxed"] is True
    assert result["terrain_bound_pct"] > GRADE * 100.0
    grades = [v for v in result["metrics"]["violations"] if v["kind"] == "grade"]
    assert grades and all("지형상 불가능" in v["reason"] for v in grades)
    assert all(v["station"].startswith("No.") for v in grades)


def test_grade_line_stays_within_limit() -> None:
    ground = np.array([0.0, 0.0, 5.0, 10.0, 10.0, 2.0, 0.0])
    line = grade_line(ground, 2.0, GRADE)
    assert np.all(np.abs(np.diff(line)) <= GRADE * 2.0 + 1e-9)
    assert station_label(125.0) == "No.6+5.0"


def test_weights_and_stream_filter() -> None:
    assert resolve_weights("weighted", None) == {"expected": 50.0, "earthwork": 25.0, "grade": 25.0}
    assert resolve_weights("gentle", {"expected": 99})["grade"] == 100.0
    assert set(MODES) == {"follow", "earthwork", "gentle", "weighted"}
    line = {"type": "LineString", "coordinates": [[0, 0], [1, 1]]}
    features = [
        {"properties": {"구분": "세류"}, "geometry": line},
        {"properties": {"구분": "소하천"}, "geometry": line},
    ]
    assert len(stream_lines(features)) == 1


def test_unknown_mode_rejected(hill: Terrain) -> None:
    with pytest.raises(ValueError):
        _run(hill, "shortest")


def test_criteria_confirmed(hill: Terrain) -> None:
    """기준값 확정(2026-09-29 사용자 결정) — `pending` 은 이제 늘 빈 목록."""
    assert _run(hill, "follow")["criteria"]["pending"] == [] == list(PENDING)


def test_criteria_overrides_change_result(hill: Terrain) -> None:
    """화면 제약 칸(계류 이격 · 지반 고름)을 겹치면 그 값으로 셈하고, 안 겹치면 기본값."""
    default = generate_initial_route(
        _line(200.0),
        hill,
        [],
        mode="follow",
        weights=None,
        max_grade=GRADE,
        min_radius_m=RADIUS,
    )
    assert default["criteria"]["stream_offset_m"] == STREAM_OFFSET_M
    overridden = generate_initial_route(
        _line(200.0),
        hill,
        [],
        mode="follow",
        weights=None,
        max_grade=GRADE,
        min_radius_m=RADIUS,
        stream_offset_m=30.0,
        grade_smooth_m=2.0,
    )
    assert overridden["criteria"]["stream_offset_m"] == 30.0
    assert overridden["criteria"]["grade_smooth_m"] == 2.0
    assert overridden["criteria"]["max_grade_pct"] == default["criteria"]["max_grade_pct"]
    _kept(overridden)


def test_initial_choice_roundtrip(tmp_path) -> None:
    """[확인] 때 적은 현재 초기값(갈래 · 비중 · 제약 겹침)을 다시 읽음 · 없거나 깨지면 추종."""
    assert read_initial_choice(tmp_path) == {
        "logic": "follow",
        "weights": {"expected": 100.0, "earthwork": 0.0, "grade": 0.0},
        "criteria": None,
    }
    write_initial_choice(tmp_path, "weighted", {"expected": 60, "earthwork": 20, "grade": 20})
    assert read_initial_choice(tmp_path) == {
        "logic": "weighted",
        "weights": {"expected": 60.0, "earthwork": 20.0, "grade": 20.0},
        "criteria": None,
    }
    # 사용자가 화면 칸에 겹쳐 넣은 값만(빈 칸은 안 담김) — 남으면 다시 열 때 그 칸만 채운다.
    write_initial_choice(
        tmp_path, "earthwork", None, {"stream_offset_m": 30.0, "grade_smooth_m": 2.0}
    )
    assert read_initial_choice(tmp_path) == {
        "logic": "earthwork",
        "weights": {"expected": 0.0, "earthwork": 100.0, "grade": 0.0},
        "criteria": {"stream_offset_m": 30.0, "grade_smooth_m": 2.0},
    }
    (tmp_path / "B05_Profile" / "route" / "initial_choice.json").write_text("{", encoding="utf-8")
    assert read_initial_choice(tmp_path)["logic"] == "follow"
    assert read_initial_choice(tmp_path)["criteria"] is None


def test_request_accepts_logic_name() -> None:
    from B05_Profile.B05_Profile_Router_Replan import RouteInitialRequest, RouteReplanRequest

    assert RouteInitialRequest.model_validate({"logic": "gentle"}).mode == "gentle"
    assert RouteInitialRequest.model_validate({"mode": "earthwork"}).mode == "earthwork"
    replan = RouteReplanRequest.model_validate({"vertices": [], "initial": {"logic": "weighted"}})
    assert replan.initial is not None and replan.initial.mode == "weighted"


def test_request_accepts_criteria_overrides() -> None:
    """화면 제약 칸 — 비운 칸은 None(서버 기본값), 채운 칸만 값이 실린다(계획서 20)."""
    from B05_Profile.B05_Profile_Router_Replan import RouteInitialRequest, RouteReplanRequest

    request = RouteInitialRequest.model_validate(
        {"mode": "earthwork", "criteria": {"stream_offset_m": 30, "grade_smooth_m": 2}}
    )
    assert request.criteria is not None
    assert request.criteria.stream_offset_m == 30
    assert request.criteria.grade_smooth_m == 2
    assert request.criteria.max_grade_pct is None
    assert request.criteria.min_radius_m is None
    replan = RouteReplanRequest.model_validate(
        {"vertices": [], "initial": {"mode": "weighted", "criteria": {"max_grade_pct": 12}}}
    )
    assert replan.initial is not None and replan.initial.criteria is not None
    assert replan.initial.criteria.max_grade_pct == 12


# ── 실프로젝트(랩탑_보조) — 읽기만 · storage 가 없으면 건너뜀 ──────────────────────────
PROJECT = Path(__file__).resolve().parents[2] / "storage/1/3/936be972-11bc-46c2-8bf3-b15d8de7df0d"
SURFACE = PROJECT / "B05_Profile/route/cost_surface_classification_dtm_smooth.npz"


@pytest.fixture(scope="module")
def project_runs() -> dict:
    """네 갈래 결과 — 비용면 캐시 · 계류 · 예상노선을 읽기만(파일 안 씀). 기준 14 % · R12."""
    if not SURFACE.is_file():
        pytest.skip("랩탑_보조 storage 없음")
    from pyproj import Transformer

    from B04_PreProcess.B04_PreProcess_Router_Watershed import (
        STREAM_FILE,
        _load_features,
        _reproject_features,
    )
    from common_util.common_util_crs import resolve_project_crs
    from common_util.common_util_route_geometry import (
        expected_route_csv_path,
        read_planned_route_csv,
    )

    cached = np.load(SURFACE, allow_pickle=False)
    terrain = Terrain(cached["x"], cached["y"], cached["z"], cached["valid_mask"])
    to_metric = Transformer.from_crs("EPSG:4326", resolve_project_crs(PROJECT), always_xy=True)
    features = _load_features(PROJECT / "B04_PreProcess" / "processed", STREAM_FILE)
    streams = stream_lines(_reproject_features(features, to_metric))
    route = read_planned_route_csv(expected_route_csv_path(PROJECT))
    expected = [(float(v.x), float(v.y)) for v in route.vertices]

    def run(mode: str, weights: dict | None = None) -> dict:
        return generate_initial_route(
            expected,
            terrain,
            streams,
            mode=mode,
            weights=weights,
            max_grade=GRADE,
            min_radius_m=RADIUS,
        )

    return {**{mode: run(mode) for mode in MODES}, "run": run}


def test_project_follow_is_preprocess_initial(project_runs: dict) -> None:
    """추종 = 전처리 초기값 `planned_route_initial.csv`(1078 m) 그대로."""
    from common_util.common_util_route_geometry import (
        planned_route_initial_path,
        read_planned_route_csv,
    )

    initial = read_planned_route_csv(planned_route_initial_path(PROJECT))
    stored = LineString([(v.x, v.y) for v in initial.vertices])
    follow = LineString(project_runs["follow"]["planned"])
    assert follow.hausdorff_distance(stored) < 0.01
    assert abs(follow.length - stored.length) < 0.01


def test_project_branches_differ_by_goal(project_runs: dict) -> None:
    """갈래끼리 선이 수 m 이상 갈리고 · 각 갈래가 제 목표 비교값에서 가장 좋음."""
    searched = {mode: project_runs[mode] for mode in SEARCHED}  # 비중은 50/25/25
    for first in SEARCHED:
        for second in SEARCHED:
            if first < second:
                gap = LineString(searched[first]["planned"]).hausdorff_distance(
                    LineString(searched[second]["planned"])
                )
                assert gap >= 3.0, (first, second, gap)
    assert all(_earth(searched["earthwork"]) <= _earth(r) for r in searched.values())
    top = searched["gentle"]["metrics"]["max_grade_pct"]
    assert all(top <= r["metrics"]["max_grade_pct"] for r in searched.values())
    for result in searched.values():
        assert result["metrics"]["over_limit"]["total"] == len(result["metrics"]["violations"])


def test_project_weight_ends_match_branches(project_runs: dict) -> None:
    """랩탑_보조 — 비중 100/0/0 = 추적(1078.01 m) · 0/100/0 = 토공 최소 · 0/0/100 = 기울기 순한."""
    _check_weight_ends(project_runs["run"])
    assert project_runs["run"]("weighted", ENDS["follow"])["metrics"]["length_m"] == 1078.01


def test_project_weight_moves_monotone(project_runs: dict) -> None:
    _check_weight_monotone(project_runs["run"])