"""物料选择器 — 读 MOM material_base，按 category 手风琴分组（仅本部门）"""
from fastapi import APIRouter, Query, HTTPException, status, Depends
from pydantic import BaseModel
from app.core.config import settings
from app.core.mom_database import MomSessionLocal
from app.services.auth_service import get_current_user
from sqlalchemy import text

router = APIRouter(prefix="/materials", tags=["物料选择"])

# 部门隔离：只放行本部门 category 前缀（IRIS/…）。
#
# ⚠️ 必须用**前缀** LIKE，不能反推成 ILIKE '%IRIS%'：两套实例共用同一个 MOM 库，
#    LICA 的物料是 `LICA/<中文>`（LICA/生产配件 687、LICA/销售产品 89、
#    LICA/维修服务 16 …），而 IRIS 分类树里另有 `IRIS/成品/LICA/…`
#    （野外便携 59 / 无人机 38 / 实验室内 34 / 高塔监测 30，共 171 条）——
#    那是**挂在 IRIS 名下、给 LICA 做的成品**，本来就属于本部门。
#    前缀匹配天然把前者排除、把后者包含，不需要再加特例。
#
# 另注：IRIS 的分类是多段式（`IRIS/半成品/无人机U`、`IRIS/原材料/光学/光电Opt1`），
# 拿「成品/半成品」这类类型词过滤没有意义，一律走前缀。
CATEGORY_PREFIX_LIKE = f"{settings.MATERIAL_CATEGORY_PREFIX}%"


# ============================================================
# 响应模型
# ============================================================

class MaterialGroup(BaseModel):
    category: str
    count: int


class MaterialItem(BaseModel):
    id: int
    name: str
    spec: str
    category: str
    type: str
    unit: str
    is_enabled: bool


# ============================================================
# 端点
# ============================================================

@router.get("/groups", response_model=list[MaterialGroup])
def get_material_groups(
    keyword: str = Query("", description="搜索（按名称/规格）"),
    current_user: dict = Depends(get_current_user),
):
    """
    按 category 分组汇总，前端渲染手风琴外层。
    只返回本部门（ORG_DEPARTMENT）名下的分类。
    """
    db = MomSessionLocal()
    try:
        if keyword.strip():
            sql = text("""
                SELECT category, COUNT(*) AS count
                FROM material_base
                WHERE is_enabled = TRUE
                  AND category LIKE :cat_prefix
                  AND (name ILIKE :kw OR spec_model ILIKE :kw)
                GROUP BY category
                ORDER BY category
            """)
            result = db.execute(
                sql, {"cat_prefix": CATEGORY_PREFIX_LIKE, "kw": f"%{keyword.strip()}%"}
            )
        else:
            sql = text("""
                SELECT category, COUNT(*) AS count
                FROM material_base
                WHERE is_enabled = TRUE
                  AND category LIKE :cat_prefix
                GROUP BY category
                ORDER BY category
            """)
            result = db.execute(sql, {"cat_prefix": CATEGORY_PREFIX_LIKE})

        rows = result.fetchall()
        return [MaterialGroup(category=row.category, count=row.count) for row in rows]
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(
            status_code=status.HTTP_502_BAD_GATEWAY,
            detail=f"MOM material_base 查询失败: {str(e)}",
        )
    finally:
        db.close()


@router.get("/items", response_model=list[MaterialItem])
def get_material_items(
    category: str = Query(..., description="物料分类"),
    keyword: str = Query("", description="分组内搜索"),
    limit: int = Query(500, ge=1, le=9999),
    current_user: dict = Depends(get_current_user),
):
    """
    获取指定 category 下的物料条目，前端展开手风琴时懒加载。

    这里同样要加部门前缀条件（纵深防御）：`category` 完全由客户端提供，
    只靠 `category = :cat` 精确匹配的话，构造一个跨部门的 category 就能
    把别的部门的物料捞出来。
    """
    db = MomSessionLocal()
    try:
        if keyword.strip():
            sql = text("""
                SELECT id, name, spec_model AS spec, category, material_type AS type,
                       COALESCE(unit, '') AS unit, is_enabled
                FROM material_base
                WHERE is_enabled = TRUE
                  AND category LIKE :cat_prefix
                  AND category = :cat
                  AND (name ILIKE :kw OR spec_model ILIKE :kw)
                ORDER BY name
                LIMIT :lim
            """)
            result = db.execute(
                sql,
                {
                    "cat_prefix": CATEGORY_PREFIX_LIKE,
                    "cat": category,
                    "kw": f"%{keyword.strip()}%",
                    "lim": limit,
                },
            )
        else:
            sql = text("""
                SELECT id, name, spec_model AS spec, category, material_type AS type,
                       COALESCE(unit, '') AS unit, is_enabled
                FROM material_base
                WHERE is_enabled = TRUE
                  AND category LIKE :cat_prefix
                  AND category = :cat
                ORDER BY name
                LIMIT :lim
            """)
            result = db.execute(
                sql, {"cat_prefix": CATEGORY_PREFIX_LIKE, "cat": category, "lim": limit}
            )

        rows = result.fetchall()
        return [
            MaterialItem(
                id=row.id,
                name=row.name,
                spec=row.spec,
                category=row.category,
                type=row.type,
                unit=row.unit,
                is_enabled=row.is_enabled,
            )
            for row in rows
        ]
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(
            status_code=status.HTTP_502_BAD_GATEWAY,
            detail=f"MOM material_base 查询失败: {str(e)}",
        )
    finally:
        db.close()