# api/design_router.py
"""模具结构设计类接口（批次 3 自 advanced_router 拆分，D1）。

- 请求体一律 Pydantic 模型（原 request.json() 手动解析退役，校验失败统一 422）
- 纯 Python 设计计算统一经 asyncio.to_thread 投放线程池，不阻塞事件循环；
  OCC 相关的倒扣检测经 processing_service.run_occ 的常驻 OCC 进程池
  （PythonOCC 非线程安全，进程内串行；见 OCC_THROUGHPUT.md 方案 B）
"""
import asyncio
from typing import List, Optional

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field
from sqlalchemy.ext.asyncio import AsyncSession

from shared.services.auth_service import get_current_active_user
from shared.database.database import get_db_session
from shared.models.identity import User
from moldinsight.services.processing_service import processing_service
from moldinsight.services.task_query_service import TaskQueryService
from moldinsight.api.core_modules import get_core_module

router = APIRouter()


# ---- 请求模型 ----

class BBox3D(BaseModel):
    dimensions: List[float] = Field(default_factory=lambda: [100.0, 100.0, 50.0])
    min: Optional[List[float]] = None
    max: Optional[List[float]] = None


class MoldSize(BaseModel):
    length: float = 300.0
    width: float = 300.0
    height: float = 200.0


class OptimizeLayoutRequest(BaseModel):
    product_bbox: BBox3D = Field(default_factory=BBox3D)
    cavity_count: int = Field(default=1, ge=1, le=64)
    mold_base_size: Optional[BBox3D] = None
    layout_type: str = "auto"


class CoolingDesignRequest(BaseModel):
    mold_size: MoldSize = Field(default_factory=MoldSize)
    product_bbox: BBox3D = Field(default_factory=BBox3D)
    material: str = "ABS"
    cavity_count: int = Field(default=1, ge=1, le=64)
    cycle_time_target: Optional[float] = None


class GatingDesignRequest(BaseModel):
    product_bbox: BBox3D = Field(default_factory=BBox3D)
    material: str = "ABS"
    cavity_count: int = Field(default=1, ge=1, le=64)
    gate_type: str = "auto"
    layout_positions: Optional[List[List[float]]] = None


class MoldSystemDesignRequest(BaseModel):
    mold_size: MoldSize = Field(default_factory=MoldSize)
    product_bbox: BBox3D = Field(default_factory=BBox3D)
    material: str = "ABS"
    cavity_count: int = Field(default=1, ge=1, le=64)
    gate_type: str = "auto"
    cycle_time_target: Optional[float] = None
    layout_positions: Optional[List[List[float]]] = None


class UndercutDetectRequest(BaseModel):
    task_id: str
    parting_direction: List[float] = Field(default_factory=lambda: [0.0, 0.0, 1.0])
    mold_size: MoldSize = Field(default_factory=MoldSize)


@router.post("/optimize-layout")
async def optimize_cavity_layout(
    body: OptimizeLayoutRequest,
    current_user: User = Depends(get_current_active_user),
):
    optimizer = get_core_module("cavity_layout_optimizer")
    if not optimizer:
        raise HTTPException(503, "服务不可用：核心模块未加载")
    # 纯 Python 布局优化，投放线程池避免阻塞事件循环
    result = await asyncio.to_thread(
        optimizer.optimize_layout,
        product_bbox=body.product_bbox.model_dump(exclude_none=True),
        cavity_count=body.cavity_count,
        mold_base_size=body.mold_base_size.model_dump(exclude_none=True) if body.mold_base_size else None,
        layout_type=body.layout_type,
    )
    return {"status": "success", "data": result}


@router.post("/design-cooling")
async def design_cooling_system(
    body: CoolingDesignRequest,
    current_user: User = Depends(get_current_active_user),
):
    from moldinsight.core.mold_system_designer import CoolingSystemDesigner
    designer = CoolingSystemDesigner()
    result = await asyncio.to_thread(
        designer.design_cooling_system,
        mold_size=body.mold_size.model_dump(),
        product_bbox=body.product_bbox.model_dump(exclude_none=True),
        material=body.material,
        cavity_count=body.cavity_count,
        cycle_time_target=body.cycle_time_target,
    )
    return {"status": "success", "data": result}


@router.post("/design-gating")
async def design_gating_system(
    body: GatingDesignRequest,
    current_user: User = Depends(get_current_active_user),
):
    from moldinsight.core.mold_system_designer import GatingSystemDesigner
    designer = GatingSystemDesigner()
    result = await asyncio.to_thread(
        designer.design_gating_system,
        product_bbox=body.product_bbox.model_dump(exclude_none=True),
        material=body.material,
        cavity_count=body.cavity_count,
        gate_type=body.gate_type,
        layout_positions=body.layout_positions,
    )
    return {"status": "success", "data": result}


@router.post("/design-mold-system")
async def design_complete_mold_system(
    body: MoldSystemDesignRequest,
    current_user: User = Depends(get_current_active_user),
):
    ds = get_core_module("mold_system_designer")
    if not ds:
        raise HTTPException(503, "服务不可用：核心模块未加载")
    result = await asyncio.to_thread(
        ds.design_complete_system,
        mold_size=body.mold_size.model_dump(),
        product_bbox=body.product_bbox.model_dump(exclude_none=True),
        material=body.material,
        cavity_count=body.cavity_count,
        gate_type=body.gate_type,
        cycle_time_target=body.cycle_time_target,
        layout_positions=body.layout_positions,
    )
    return {"status": "success", "data": result}


@router.post("/detect-undercuts")
async def detect_undercuts(
    body: UndercutDetectRequest,
    current_user: User = Depends(get_current_active_user),
    db_session: AsyncSession = Depends(get_db_session),
):
    # 归属校验统一走 TaskQueryService（与 /api/status 共用，含 404/403 语义）
    await TaskQueryService.ensure_task_access(db_session, body.task_id, current_user.id)

    sd = get_core_module("side_action_designer")
    if not sd:
        raise HTTPException(503, "服务不可用：核心模块未加载")

    # 方案 B：从持久化 STP 原件落盘，倒扣分析在常驻 OCC 子进程内完成（形状不跨进程）
    from moldinsight.services.stp_materializer import get_stp_materializer
    stp_path = await get_stp_materializer().materialize_stp_for_task(db_session, body.task_id)
    if stp_path is None:
        raise HTTPException(410, "任务几何不可用：无法从存储重建 STP 形状，请重新上传分析")

    try:
        result = await processing_service.run_occ(
            "detect_undercuts",
            {
                "stp_path": str(stp_path),
                "parting_direction": body.parting_direction,
                "mold_size": body.mold_size.model_dump(),
            },
        )
    finally:
        stp_path.unlink(missing_ok=True)
    return {"status": "success", "data": result}