"""B07 종단도 — 장마다 그림 좌하단 = 작도영역 좌하단 · 고정 축척 · 넘치면 장을 더 나눔 (59-3)."""

import pytest

from B07_DesignDetail.B07_DesignDetail_Engine_Cad import FRAME_LAYER_ID
from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Long import (
    build_longitudinal_drawing,
    longitudinal_chunks,
)
from B07_DesignDetail.B07_DesignDetail_Engine_Template import entities_bbox, usable_area


def _longitudinal(count: int, interval: float, slope: float) -> dict:
    xs = [index * interval for index in range(count)]
    return {
        "samples": [{"valid": True, "chainage_m": x, "elevation_m": 100.0 + slope * x} for x in xs],
        "stations": [{"chainage_m": x} for x in xs],
        "design_profiles": [
            {"samples": [{"chainage_m": x, "elevation_m": 100.5 + slope * x} for x in xs]}
        ],
    }


def _sheets(longitudinal: dict) -> list[tuple[tuple, tuple]]:
    result = []
    for chunk in longitudinal_chunks(longitudinal):
        entities = build_longitudinal_drawing(longitudinal, chunk["id"], chunk)["entities"]
        content = entities_bbox([e for e in entities if e.get("layerId") != FRAME_LAYER_ID])
        frame = entities_bbox([e for e in entities if e.get("layerId") == FRAME_LAYER_ID])
        result.append((content, frame))
    return result


@pytest.mark.parametrize(
    ("count", "interval", "slope"),
    [(66, 20.0, 0.05), (40, 40.0, 0.0), (40, 20.0, 0.25)],
)
def test_every_sheet_fits_and_starts_at_same_corner(count, interval, slope) -> None:
    longitudinal = _longitudinal(count, interval, slope)
    sheets = _sheets(longitudinal)
    usable_w, usable_h = usable_area()
    corners = set()
    for content, frame in sheets:
        assert content[2] - content[0] <= usable_w + 1e-6
        assert content[3] - content[1] <= usable_h + 1e-6
        corners.add((round(content[0] - frame[0], 3), round(content[1] - frame[1], 3)))
    assert len(corners) == 1
    chunks = longitudinal_chunks(longitudinal)
    # 이어지는 장은 경계 측점 하나를 나눠 갖고 끝까지 덮는다.
    assert chunks[0]["start_m"] == 0.0
    assert chunks[-1]["end_m"] == (count - 1) * interval
    for before, after in zip(chunks, chunks[1:]):
        assert before["end_m"] == after["start_m"]


def test_wide_interval_splits_more() -> None:
    # 40 m 간격 30측점 = 1,160 mm > 작도영역 폭 → 30개보다 적게 담는다
    chunks = longitudinal_chunks(_longitudinal(40, 40.0, 0.0))
    assert len(chunks) > 2