"""노면공(G군) 구조물 정본 → 횡단 측점 포장 제원(`section.pavement`).

범위(start~end · ±0.02 m) 안 측점마다 `[{type_id, spec, thickness_m, start_m, end_m, widening_on}]`.
두께 = `options.height_m` · 무늬 = `options.pave_spec` · 확폭 끈 구간 = `options.widening_off`("s-e,s-e").
그림 · 정보만 — 토공 면적 · 포장 켜기(`design.paved`)는 건드리지 않음.

**짝**: `common_util/common_util_structure_pavement.ts` — 브라우저는 저장 전 목록으로 같은 제원을 얹음.
거울 시험 `resources/tester/test_b06_structure_pavement_mirror.py`.
"""

import logging
import math
from pathlib import Path
from typing import Any

logger = logging.getLogger(__name__)

# 구간 경계 측점을 구간 안으로 볼 허용 오차(m) — C군 벽(`common_util_structure_walls`)과 같은 값.
_EDGE_TOLERANCE_M = 0.02


def _num(value: Any) -> float | None:
    if isinstance(value, bool) or not isinstance(value, (int, float)):
        return None
    return value if math.isfinite(value) else None


def widening_off_ranges(text: Any) -> list[tuple[float, float]]:
    """「시작-끝,시작-끝」(측점 m) → 구간 목록. 못 읽는 조각은 버림(= 켬)."""
    ranges: list[tuple[float, float]] = []
    for part in str(text or "").split(","):
        bounds = part.split("-")
        if len(bounds) != 2 or not bounds[0].strip() or not bounds[1].strip():
            continue
        try:
            start, end = float(bounds[0]), float(bounds[1])
        except ValueError:
            continue
        if math.isfinite(start) and math.isfinite(end):
            ranges.append((min(start, end), max(start, end)))
    return ranges


def pavement_specs_from(
    structures: list[dict[str, Any]], type_ids: set[str]
) -> list[dict[str, Any]]:
    """G군 구조물 → 구간 제원. 범위가 없으면(시작 · 끝 · 기준 모두 빔) 건너뜀."""
    specs: list[dict[str, Any]] = []
    for item in structures:
        if item.get("type_id") not in type_ids:
            continue
        anchor = _num(item.get("chainage_m"))
        start = _num(item.get("start_m"))
        end = _num(item.get("end_m"))
        start = anchor if start is None else start
        end = anchor if end is None else end
        if start is None or end is None:
            continue
        options = item.get("options") or {}
        spec = options.get("pave_spec")
        specs.append(
            {
                "type_id": item["type_id"],
                "spec": spec if isinstance(spec, str) and spec else None,
                "thickness_m": _num(options.get("height_m")),
                "start_m": min(start, end),
                "end_m": max(start, end),
                "widening_off": widening_off_ranges(options.get("widening_off")),
            }
        )
    return specs


def _inside(chainage: float, start: float, end: float) -> bool:
    return start - _EDGE_TOLERANCE_M <= chainage <= end + _EDGE_TOLERANCE_M


def attach_pavement_specs(sections: list[dict[str, Any]], specs: list[dict[str, Any]]) -> int:
    """범위 안 측점에 `pavement` 목록을 얹음. 얹은 측점 수를 돌려줌."""
    attached = 0
    for section in sections:
        chainage = _num(section.get("chainage_m"))
        if chainage is None:
            continue
        found = [
            {
                "type_id": spec["type_id"],
                "spec": spec["spec"],
                "thickness_m": spec["thickness_m"],
                "start_m": spec["start_m"],
                "end_m": spec["end_m"],
                "widening_on": not any(
                    _inside(chainage, start, end) for start, end in spec["widening_off"]
                ),
            }
            for spec in specs
            if _inside(chainage, spec["start_m"], spec["end_m"])
        ]
        if found:
            section["pavement"] = found
            attached += 1
    return attached


def attach_pavement_structures(project_root: Path, cross_sections: list[dict[str, Any]]) -> int:
    """저장된 구조물 정본으로 `section.pavement` 를 얹음. 정본을 못 읽으면 0(비치명)."""
    from B05_Profile.B05_Profile_Structures_Repository import load_structures
    from B05_Profile.B05_Profile_Structures_Schema import structure_type_map

    try:
        type_ids = {key for key, value in structure_type_map().items() if value.group == "G"}
        structures = [item.model_dump() for item in load_structures(str(project_root))[1]]
    except Exception:  # noqa: BLE001 — 정본을 못 읽어도 횡단 조회는 이어 감
        logger.exception("B06 노면공 정본을 읽지 못했습니다 (없는 것으로 본다)")
        return 0
    return attach_pavement_specs(cross_sections, pavement_specs_from(structures, type_ids))