"""B07 계획평면도 종류 — 정보 조각을 골라 한 장으로 얹는다(PLAN 60장).

계획평면도는 여러 종류(지형 · 노선배치도 · 대피소 · 라이다 · 사용자 추가)가 **같은 양식**이다.
정보 조각(등고선 · 중심선 · 비탈 외곽선 · 비탈 눈금 · IP · R · 측점 NO · 시종점 ·
대피소/사토장 · 라이다 배경)마다 프로젝트 저장소에 파일이 하나씩 있고, 종류는 그중
무엇을 얹을지 고른 목록이다. 이 모듈은 조각 기하 계산과 도면 조립만 한다(파일 입출력 없음).

좌표 규약: 종이 mm = (사업지 좌표 m - 그 장 도곽 최소점) x MM (1/1,200).
"""

import math
from bisect import bisect_left
from typing import Any

from B07_DesignDetail.B07_DesignDetail_Engine_Cad import (
    DRAWING_FORMAT,
    FRAME_LAYER_ID,
    TABLE_LABEL_COLOR,
    _layer,
    _text_entity,
    polyline_entity,
)
from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Plan import (
    _COMPASS_MARGIN,
    _COMPASS_SIZE,
    _FONT_SIZE,
    _ROUTE_WIDTH,
    _TITLE_FONT_SIZE,
    CONTOUR_COLOR,
    MM,
    STREAM_COLOR,
)
from B07_DesignDetail.B07_DesignDetail_Engine_Template import (
    compass_entities,
    entities_bbox,
    frame_entities,
    scale_fields,
)
from config.config_system import DRAWING_SCALE_PLAN

# 조각 (id, 이름, 도면층 잠금) — 그리는 차례(배경이 먼저).
PIECES: tuple[tuple[str, str, bool], ...] = (
    ("lidar", "라이다 배경", True),
    ("contour", "등고선", True),
    ("stream", "계류", True),
    ("slope_ticks", "비탈 눈금", False),
    ("slope_outline", "성토사면 외곽선", False),
    ("centerline", "중심선", False),
    ("ip", "IP", False),
    ("radius", "R", False),
    ("station", "측점 NO", False),
    ("endpoints", "시종점", False),
    ("refuge", "대피소 · 사토장", False),
)
PIECE_IDS: tuple[str, ...] = tuple(piece for piece, _name, _locked in PIECES)

_TERRAIN = ("contour", "stream", "centerline", "slope_outline", "slope_ticks", "ip", "radius")
# 기본 종류 넷 — 지울 수 있다. id 는 옛 도면 id(plan_terrain …)와 같아 확정본이 이어진다.
DEFAULT_KINDS: tuple[dict[str, Any], ...] = (
    {"id": "terrain", "name": "지형", "pieces": [*_TERRAIN, "station"]},
    {
        "id": "route",
        "name": "노선배치도",
        "pieces": [p for p in _TERRAIN if p != "radius"] + ["station", "endpoints"],
    },
    {
        "id": "layout",
        "name": "대피소",
        "pieces": [p for p in _TERRAIN if p != "radius"] + ["station", "refuge"],
    },
    # 라이다 = 지형과 같은 정보 · 배경만 라이다(등고선 · 계류 대신).
    {
        "id": "lidar",
        "name": "라이다",
        "pieces": ["lidar", *[p for p in _TERRAIN if p not in ("contour", "stream")], "station"],
    },
)

_COLORS = {
    "contour": CONTOUR_COLOR,
    "stream": STREAM_COLOR,
    "centerline": "#ff4d4d",
    "slope_outline": "#4dd8e6",
    "slope_ticks": "#ff4d4d",
    "ip": "#4d7dff",
    "radius": "#4d7dff",
    "station": "#ffe066",
    "endpoints": "#ff9d4d",
    "refuge": "#7ddc7d",
}
TICK_STEP_M = 2.0  # 비탈 눈금 간격(실거리 m) — 긴 · 짧은 눈금이 번갈아 선다
_MAJOR_EVERY = 5  # 측점 NO 큰 글자 · 동그라미 간격(측점 수)
_LABEL_FONT = 2.5
_MAJOR_FONT = 4.5
_TICK_MM = 1.5
_CIRCLE_MM = 1.2


def layer_id(piece: str) -> str:
    return f"b07-plan-{piece}"


# ── 노선 따라가기 ─────────────────────────────────────


def route_frame(
    route: list[tuple[float, float, float]], chainage: float
) -> tuple[float, float, float, float]:
    """노선 (누가거리, x, y) 위 그 누가거리 자리와 좌측 법선 (x, y, nx, ny)."""
    chainages = [item[0] for item in route]
    index = min(max(bisect_left(chainages, chainage), 1), len(route) - 1)
    (c0, x0, y0), (c1, x1, y1) = route[index - 1], route[index]
    dx, dy = x1 - x0, y1 - y0
    length = math.hypot(dx, dy) or 1.0
    ratio = (chainage - c0) / (c1 - c0) if c1 > c0 else 0.0
    return (x0 + dx * ratio, y0 + dy * ratio, -dy / length, dx / length)


def _interp(records: list[dict[str, float]], chainage: float, key: str) -> float:
    chainages = [record["chainage_m"] for record in records]
    index = bisect_left(chainages, chainage)
    if index <= 0:
        return records[0][key]
    if index >= len(records):
        return records[-1][key]
    before, after = records[index - 1], records[index]
    span = after["chainage_m"] - before["chainage_m"]
    ratio = (chainage - before["chainage_m"]) / span if span > 0 else 0.0
    return before[key] + (after[key] - before[key]) * ratio


def slope_end(
    design_line: list[dict[str, Any]], samples: list[dict[str, Any]], edge: float, side: str
) -> float:
    """노견 끝에서 바깥으로 — 설계선이 원지반에 닿는 오프셋(비탈 끝). 못 닿으면 설계선 끝.

    설계선(B06 횡단 설계 결과)은 비탈이 지반과 만난 뒤로 지반을 따라간다 — 그 첫 자리가 끝이다.
    좌측은 오프셋이 커지는 쪽, 우측은 작아지는 쪽이 바깥이다.
    """
    ground = sorted(
        (float(item["offset_m"]), float(item["elevation_m"]))
        for item in samples
        if item.get("valid", True) and isinstance(item.get("elevation_m"), (int, float))
    )
    points = sorted((float(p["offset_m"]), float(p["elevation_m"])) for p in design_line)
    outward = (
        [p for p in points if p[0] > edge]
        if side == "left"
        else [p for p in points[::-1] if p[0] < edge]
    )
    if not ground:
        return outward[-1][0] if outward else edge
    offsets = [offset for offset, _z in ground]

    def ground_at(offset: float) -> float:
        index = min(max(bisect_left(offsets, offset), 1), len(ground) - 1)
        (x0, z0), (x1, z1) = ground[index - 1], ground[index]
        return z0 + (z1 - z0) * ((offset - x0) / (x1 - x0) if x1 > x0 else 0.0)

    end, differs = edge, False
    for offset, elevation in outward:
        if abs(elevation - ground_at(offset)) <= 1e-3:
            return offset if differs else end
        differs, end = True, offset
    return end


def slope_pieces(
    route: list[tuple[float, float, float]],
    records: list[dict[str, Any]],
    start_m: float,
    end_m: float,
) -> tuple[dict[str, Any], dict[str, Any]]:
    """측점별 노견 끝 · 비탈 끝 오프셋에서 외곽선 넷과 비탈 눈금을 만든다.

    `records` = [{chainage_m, left_edge_m, left_end_m, right_edge_m, right_end_m,
    (x, y, nx, ny)?}] — 좌(+) · 우(-) 오프셋. 측점 자리는 횡단 파일의 중심 · 좌축을 그대로
    써서 측점에서 외곽선 폭이 횡단 설계 값과 같다. 측점 사이는 노선을 따라 보간한다.
    """
    records = sorted(records, key=lambda record: record["chainage_m"])
    if len(route) < 2 or not records:
        return {"lines": [], "stations": []}, {"ticks": []}
    keys = ("left_edge_m", "left_end_m", "right_edge_m", "right_end_m")
    by_chainage = {round(record["chainage_m"], 3): record for record in records}
    samples = {
        round(record["chainage_m"], 3)
        for record in records
        if start_m <= record["chainage_m"] <= end_m
    }
    step = start_m
    while step <= end_m:
        samples.add(round(step, 3))
        step += TICK_STEP_M
    lines: dict[str, list[list[float]]] = {key: [] for key in keys}
    ticks: list[list[list[float]]] = []
    for index, chainage in enumerate(sorted(samples)):
        record = by_chainage.get(chainage)
        if record and all(k in record for k in ("x", "y", "nx", "ny")):
            x, y, nx, ny = record["x"], record["y"], record["nx"], record["ny"]
        else:
            x, y, nx, ny = route_frame(route, chainage)
        offsets = {key: _interp(records, chainage, key) for key in keys}
        points = {
            key: [round(x + nx * value, 4), round(y + ny * value, 4)]
            for key, value in offsets.items()
        }
        for key in keys:
            lines[key].append(points[key])
        # 눈금은 노견 끝에서 비탈 끝으로 — 긴 것 · 짧은 것이 번갈아 선다(납품 도면 관례).
        for side in ("left", "right"):
            edge, end = offsets[f"{side}_edge_m"], offsets[f"{side}_end_m"]
            if abs(end - edge) < 0.05:
                continue
            reach = end if index % 2 == 0 else edge + (end - edge) / 2.0
            ticks.append([points[f"{side}_edge_m"], [x + nx * reach, y + ny * reach]])
    outline = {
        "lines": [lines[key] for key in keys],
        "stations": [
            {key: record[key] for key in ("chainage_m", *keys)}
            for record in records
            if start_m <= record["chainage_m"] <= end_m
        ],
    }
    return outline, {"ticks": ticks}


def curve_pieces(
    curves: list[dict[str, Any]],
    route: list[tuple[float, float, float]],
    box: tuple[float, float, float, float],
) -> tuple[dict[str, Any], dict[str, Any]]:
    """곡선표에서 IP(교각점 · 접선)와 R 라벨을 만든다. 번호는 노선 전체 차례(IP1 …)."""
    ips: list[dict[str, Any]] = []
    radii: list[dict[str, Any]] = []
    min_x, min_y, max_x, max_y = box
    for number, curve in enumerate(curves, start=1):
        apex, start, end = curve.get("apex"), curve.get("start"), curve.get("end")
        radius = curve.get("radius_m")
        if not (apex and start and end) or not isinstance(radius, (int, float)):
            continue
        if not (min_x <= apex[0] <= max_x and min_y <= apex[1] <= max_y):
            continue
        ips.append(
            {
                "name": f"IP{number}",
                "apex": list(apex[:2]),
                "start": list(start[:2]),
                "end": list(end[:2]),
            }
        )
        # R 라벨은 곡선 한가운데에서 교각점 반대쪽(곡선 안쪽)으로 조금 띄운다.
        middle = min(
            ((x, y) for _c, x, y in route),
            key=lambda point: math.hypot(point[0] - apex[0], point[1] - apex[1]),
            default=(apex[0], apex[1]),
        )
        dx, dy = middle[0] - apex[0], middle[1] - apex[1]
        length = math.hypot(dx, dy) or 1.0
        radii.append(
            {
                "label": f"R={round(float(radius), 1):g}",
                "at": [middle[0] + dx / length * 4.0, middle[1] + dy / length * 4.0],
            }
        )
    return {"items": ips}, {"items": radii}


# ── 도면 조립 ─────────────────────────────────────────


def _circle(center: tuple[float, float], radius: float) -> list[tuple[float, float]]:
    return [
        (center[0] + radius * math.cos(a), center[1] + radius * math.sin(a))
        for a in (2 * math.pi * i / 24 for i in range(25))
    ]


def _reading(nx: float, ny: float) -> tuple[float, float]:
    """글자 방향 — 노선 방향(법선을 돌린 것)으로 쓰되 거꾸로 서지 않게."""
    tx, ty = ny, -nx
    return (tx, ty) if tx > 0 or (abs(tx) < 1e-9 and ty > 0) else (-tx, -ty)


def _piece_entities(
    drawing_id: str, piece: str, data: dict[str, Any], paper: Any
) -> list[dict[str, Any]]:
    layer, color = layer_id(piece), _COLORS.get(piece, TABLE_LABEL_COLOR)
    out: list[dict[str, Any]] = []

    def line(points: Any, suffix: str, width: int = 1, dash: list[int] | None = None) -> None:
        entity = polyline_entity(
            drawing_id,
            [paper(p) for p in points],
            layer,
            color,
            suffix=suffix,
            width=width,
            dash=dash,
        )
        if entity:
            out.append(entity)

    def text(seed: str, label: str, at: tuple[float, float], size: float, **kw: Any) -> None:
        out.append(
            _text_entity(
                f"{drawing_id}:{piece}:{seed}", label, at[0], at[1], layer, size, color, **kw
            )
        )

    if piece == "lidar":
        image, box = data.get("image"), data.get("box")
        if image and box:
            left, bottom = paper((box[0], box[1]))
            right, top = paper((box[2], box[3]))
            corners = [(left, bottom), (right, bottom), (right, top), (left, top)]
            out.append(
                {
                    "id": f"{drawing_id}:lidar",
                    "type": "Image",
                    "lineColor": "#ffffff",
                    "lineWidth": 1,
                    "layerId": layer,
                    "shapeData": {
                        "points": [{"x": x, "y": y} for x, y in corners],
                        "imageData": image,
                    },
                }
            )
    elif piece in ("contour", "stream", "slope_outline"):
        for index, points in enumerate(data.get("lines") or []):
            line(points, f":{index}")
    elif piece == "centerline":
        for index, points in enumerate(data.get("lines") or []):
            line(points, f":{index}", width=_ROUTE_WIDTH)
    elif piece == "slope_ticks":
        for index, points in enumerate(data.get("ticks") or []):
            line(points, f":{index}")
    elif piece == "ip":
        for index, item in enumerate(data.get("items") or []):
            line([item["start"], item["apex"], item["end"]], f":{index}", dash=[4, 2])
            apex = paper(item["apex"])
            out_circle = polyline_entity(
                drawing_id, _circle(apex, _CIRCLE_MM), layer, color, suffix=f":c:{index}"
            )
            if out_circle:
                out.append(out_circle)
            text(f"{index}", item["name"], (apex[0], apex[1] - _CIRCLE_MM - 3.0), _LABEL_FONT)
    elif piece == "radius":
        for index, item in enumerate(data.get("items") or []):
            text(f"{index}", item["label"], paper(item["at"]), _LABEL_FONT)
    elif piece == "station":
        for index, item in enumerate(data.get("items") or []):
            cx, cy = paper((item["x"], item["y"]))
            nx, ny = item["nx"], item["ny"]
            line(
                [
                    (item["x"] - nx * _TICK_MM / MM, item["y"] - ny * _TICK_MM / MM),
                    (item["x"] + nx * _TICK_MM / MM, item["y"] + ny * _TICK_MM / MM),
                ],
                f":{index}",
            )
            if item.get("major"):
                circle = polyline_entity(
                    drawing_id, _circle((cx, cy), _CIRCLE_MM), layer, color, suffix=f":c:{index}"
                )
                if circle:
                    out.append(circle)
                gap = _MAJOR_FONT * 1.8
                text(
                    f"{index}",
                    item["label"],
                    (cx + nx * gap, cy + ny * gap),
                    _MAJOR_FONT,
                    direction=_reading(nx, ny),
                )
    elif piece == "endpoints":
        for index, item in enumerate(data.get("items") or []):
            nx, ny = item["nx"], item["ny"]
            reach = 6.0 / MM  # 종이 6mm 막대
            line(
                [
                    (item["x"] - nx * reach, item["y"] - ny * reach),
                    (item["x"] + nx * reach, item["y"] + ny * reach),
                ],
                f":{index}",
                width=2,
            )
            cx, cy = paper((item["x"], item["y"]))
            text(f"{index}", item["label"], (cx + nx * 9.0, cy + ny * 9.0), _LABEL_FONT + 0.5)
    elif piece == "refuge":
        size = 2.0  # 네모 기호 반크기(종이 mm)
        for index, item in enumerate(data.get("items") or []):
            x, y, half = item["x"], item["y"], size / MM
            corners = [(-1, -1), (1, -1), (1, 1), (-1, 1), (-1, -1)]
            line([(x + sx * half, y + sy * half) for sx, sy in corners], f":{index}")
            cx, cy = paper((x, y))
            text(f"{index}", item["label"], (cx + size + 1.0, cy), _LABEL_FONT, align="left")
    return out


def build_plan_kind_drawing(
    drawing_id: str,
    label: str,
    box: tuple[float, float, float, float],
    pieces: dict[str, dict[str, Any]],
) -> dict[str, Any]:
    """고른 조각만 얹어 계획평면도 한 장을 만든다. `box` = 그 장 도곽 범위(실좌표 m)."""
    min_x, min_y = box[0], box[1]

    def paper(point: Any) -> tuple[float, float]:
        return ((point[0] - min_x) * MM, (point[1] - min_y) * MM)

    entities: list[dict[str, Any]] = []
    for piece in PIECE_IDS:
        if piece in pieces:
            entities.extend(_piece_entities(drawing_id, piece, pieces[piece], paper))
    # 도곽 · 방위표 자리는 조각과 무관하게 같은 자리 — 그 장 범위를 기준으로 잡는다.
    frame_box = (0.0, 0.0, (box[2] - min_x) * MM, (box[3] - min_y) * MM)
    entities.extend(
        compass_entities(
            drawing_id,
            (
                frame_box[2] + _COMPASS_MARGIN + _COMPASS_SIZE / 2.0,
                frame_box[3] - _COMPASS_SIZE / 2.0,
            ),
            _COMPASS_SIZE,
        )
    )
    bbox = entities_bbox(entities) or frame_box
    min_bx, _min_by, max_bx, max_by = bbox
    entities.append(
        _text_entity(
            f"{drawing_id}:title",
            label,
            (min_bx + max_bx) / 2.0,
            max_by + 12.0,
            "b07-plan-title",
            _TITLE_FONT_SIZE,
            TABLE_LABEL_COLOR,
        )
    )
    entities.append(
        _text_entity(
            f"{drawing_id}:scale",
            f"S = 1/{DRAWING_SCALE_PLAN:,}",
            max_bx,
            max_by + 5.0,
            "b07-plan-title",
            _FONT_SIZE,
            TABLE_LABEL_COLOR,
            align="right",
        )
    )
    entities.extend(
        frame_entities(
            drawing_id,
            entities_bbox(entities) or bbox,
            fit=False,
            fields={"도면명": label, **scale_fields(("", DRAWING_SCALE_PLAN))},
        )
    )
    layers = [
        _layer(layer_id(piece), name, locked=locked)
        for piece, name, locked in PIECES
        if piece in pieces
    ]
    return {
        "format": DRAWING_FORMAT,
        "entities": entities,
        "layers": [
            *layers,
            _layer("b07-plan-title", "표제"),
            _layer(FRAME_LAYER_ID, "도각", locked=True),
        ],
    }