"""Hole executors (hole_blind / hole_countersink / hole_counterbore / hole_wizard)."""

from __future__ import annotations

from typing import TYPE_CHECKING, Any

from ..registry import atomic_executor
from ..specs import HoleSpec, PlaneSpec, vector_scale
from ..topology import FeaturePlanNode, FeatureResult, RuntimeDiagnostic
from .common import _hole_starts, _host_plane

if TYPE_CHECKING:  # pragma: no cover - import for type checkers only
    from ..session import ExecutionSession


@atomic_executor("hole_blind", "hole_countersink", "hole_counterbore")
def _hole_executor(node: FeaturePlanNode, session: "ExecutionSession", sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_hole(node, session, wizard=False)


@atomic_executor("hole_wizard")
def _hole_wizard_executor(node: FeaturePlanNode, session: "ExecutionSession", sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_hole(node, session, wizard=True)


def _execute_hole(node: FeaturePlanNode, session: "ExecutionSession", *, wizard: bool = False) -> FeatureResult:
    # 孔特征（hole）执行入口：在指定宿主面上按孔规格生成切除工具，并从主体上减去。
    
    # 1. 校验：孔是切除操作，必须先有主体。
    if session.body is None:
        raise ValueError("hole feature has no body")
    # 2. 确定宿主面 host_face：
    host_selector = node.params.get("host_face")
    if isinstance(host_selector, dict) and isinstance(host_selector.get("frame"), dict):
        #   若直接带 frame（平面定义），则以该平面为宿主，孔位按局部坐标解释。
        host = PlaneSpec.from_mapping(host_selector["frame"])
        positions_are_local = True
    else:
        #   否则从特征选择器中取 face，解析出宿主平面，孔位按世界坐标解释。
        selectors = list(node.selectors)
        if isinstance(host_selector, dict):
            selectors.append(host_selector)
        selector = next((item for item in selectors if item.get("kind") == "face"), None)
        if selector is None:
            raise ValueError("hole requires host_face selector or frame")
        host = _host_plane(session.resolve(selector))
        positions_are_local = False
    # 3. 解析孔规格 HoleSpec（直径、深度、类型等，wizard 模式提供额外默认值）。
    spec = HoleSpec.from_feature(node.atomic_id, node.params, wizard=wizard)
    # 4. A host-face normal is an outward B-rep orientation, so its inverse
    # always enters the material.  Inferring direction from the global body
    # centre fails for concave or multi-leg parts: for example, the top face
    # of an L bracket can sit below the whole body's centre and the old rule
    # drilled outward, producing a no-op feature reported as successful.
    # The selected topology face is the local, authoritative orientation.
    inward = vector_scale(host.normal, -1)
    # 5. 生成孔切除工具：按孔规格、起始位置、内方向及“贯穿到主体底面”的深度构造工具实体。
    tool = session.adapter.hole_tool(
        spec,
        _hole_starts(spec, host_plane=host, positions_are_local=positions_are_local),
        inward,
        session.adapter.body_span(session.body, inward) + 2.0,
    )
    # 6. 从主体上减去工具实体，登记新主体并返回结果。
    #    thread 是装饰螺纹（无螺距、不进实体几何，SolidWorks/STEP 的螺纹孔
    #    即光滑孔）：孔按光滑圆柱孔执行，同时记录 info 级诊断便于批量报告
    #    追溯降级数量（issue #9，capabilities 已不再拒绝 thread）。
    diagnostics: list[RuntimeDiagnostic] = []
    if wizard and node.params.get("thread"):
        diagnostics.append(RuntimeDiagnostic(
            code="thread_decoration_ignored",
            message="Thread decoration is not modeled; the hole falls back to a plain cylindrical bore",
            feature_id=node.feature_id,
        ))
    session.register_body(node.feature_id, session.adapter.cut(session.body, tool), replay_node=node)
    return session.result(node, diagnostics=diagnostics)