"""存储设施（树结构）+ 小格 CRUD（biz_storage_facility / biz_storage_facility_slot）"""
from __future__ import annotations

from datetime import datetime
import re
from typing import Any, Dict, List, Optional

from sqlalchemy import and_, case, false, func, or_
from sqlalchemy.orm import Session

from app.core.utils import generate_uuid
from app.models.models import BizStorageFacility, BizStorageFacilitySlot
from app.services.storage_facility_code import (
    assert_sibling_node_code_unique,
    build_full_slot_code,
    build_node_code_path,
    cascade_refresh_slot_name_snapshots_for_nodes,
    cascade_refresh_slot_name_snapshots_for_slots,
    decode_slot_layout_order,
    encode_slot_layout_order,
    load_facility_ancestor_map,
    load_facility_map,
    validate_node_code,
)


# ---------------------------------------------------------------------------
# Facility node helpers
# ---------------------------------------------------------------------------


def _row_to_dict(f: BizStorageFacility) -> Dict[str, Any]:
    return {
        "id": f.id,
        "parentId": f.parent_id,
        "nodeName": f.node_name,
        "nodeCode": f.node_code or "",
        "nodeType": f.node_type or "",
        "isLeaf": 1 if f.is_leaf else 0,
        "tenantNo": f.tenant_no,
        "orderNum": f.order_num if f.order_num is not None else 0,
        "remark": f.remark or "",
        "createTime": f.create_time.strftime("%Y-%m-%d %H:%M:%S") if f.create_time else "",
        "updateTime": f.update_time.strftime("%Y-%m-%d %H:%M:%S") if f.update_time else "",
    }


def list_all_facilities(
    db: Session,
    *,
    tenant_no: str,
    keyword: Optional[str] = None,
) -> List[Dict[str, Any]]:
    """Return FLAT list of all non-deleted facility nodes (no pagination, no tree building)."""
    q = db.query(BizStorageFacility).filter(BizStorageFacility.del_flag == 0)
    if tenant_no:
        q = q.filter(BizStorageFacility.tenant_no == tenant_no)
    kw = (keyword or "").strip()
    if kw:
        like = f"%{kw}%"
        q = q.filter(
            or_(
                BizStorageFacility.node_name.like(like),
                BizStorageFacility.node_code.like(like),
            )
        )
    rows = q.order_by(BizStorageFacility.order_num.asc(), BizStorageFacility.create_time.asc()).all()
    return [_row_to_dict(x) for x in rows]


def get_facility(db: Session, node_id: str, tenant_no: Optional[str] = None) -> Optional[BizStorageFacility]:
    q = db.query(BizStorageFacility).filter(
        and_(BizStorageFacility.id == node_id, BizStorageFacility.del_flag == 0)
    )
    if tenant_no:
        q = q.filter(BizStorageFacility.tenant_no == tenant_no)
    return q.first()


def get_children(db: Session, parent_id: str, tenant_no: str) -> List[BizStorageFacility]:
    """Direct children of a node."""
    return (
        db.query(BizStorageFacility)
        .filter(
            and_(
                BizStorageFacility.parent_id == parent_id,
                BizStorageFacility.del_flag == 0,
                BizStorageFacility.tenant_no == tenant_no,
            )
        )
        .order_by(BizStorageFacility.order_num.asc(), BizStorageFacility.create_time.asc())
        .all()
    )


def collect_descendant_ids(db: Session, node_id: str, tenant_no: str) -> List[str]:
    """Iteratively collect ALL descendant node IDs (stack-based, no recursion)."""
    ids: List[str] = []
    stack: List[str] = [node_id]
    while stack:
        current = stack.pop()
        children = get_children(db, current, tenant_no)
        for child in children:
            ids.append(child.id)
            stack.append(child.id)
    return ids


def create_facility(
    db: Session,
    *,
    parent_id: str = "0",
    node_name: str,
    node_code: str,
    node_type: Optional[str] = None,
    is_leaf: int = 0,
    tenant_no: str = "zkxw",
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
) -> BizStorageFacility:
    name = (node_name or "").strip()
    if not name:
        raise ValueError("节点名称不能为空")
    code = validate_node_code(node_code)
    pid = parent_id or "0"
    assert_sibling_node_code_unique(
        db, parent_id=pid, node_code=code, tenant_no=tenant_no
    )
    obj = BizStorageFacility(
        id=generate_uuid(),
        parent_id=pid,
        node_name=name,
        node_code=code,
        node_type=(node_type or "").strip() or None,
        is_leaf=is_leaf,
        tenant_no=tenant_no,
        order_num=order_num if order_num is not None else 0,
        remark=(remark or "").strip() or None,
        create_by=user_id,
        create_dept_id="",
        create_time=datetime.now(),
        update_by=user_id,
        update_time=datetime.now(),
        del_flag=0,
    )
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


def _format_seq(num: int, pad_width: int) -> str:
    s = str(num)
    width = int(pad_width or 0)
    if width <= 0:
        return s
    return s.zfill(width)


def batch_create_facilities(
    db: Session,
    *,
    parent_id: str = "0",
    name_prefix: str = "",
    name_suffix: str = "",
    start_num: int,
    end_num: int,
    pad_width: int = 0,
    code_prefix: str = "",
    code_suffix: str = "",
    node_type: Optional[str] = None,
    is_leaf: int = 0,
    tenant_no: str = "zkxw",
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
) -> List[Dict[str, Any]]:
    """按「前缀 + 序号 + 后缀」批量创建同级子节点。"""
    if start_num < 0 or end_num < 0:
        raise ValueError("序号不能为负数")
    if end_num < start_num:
        raise ValueError("结束序号不能小于起始序号")
    count = end_num - start_num + 1
    if count > 200:
        raise ValueError("单次最多创建 200 个子节点")
    if pad_width < 0 or pad_width > 8:
        raise ValueError("位数补零须在 0～8 之间")

    pid = (parent_id or "0").strip() or "0"
    if pid != "0":
        parent = get_facility(db, pid, tenant_no=tenant_no)
        if not parent:
            raise ValueError("上级节点不存在")

    name_prefix = name_prefix or ""
    name_suffix = name_suffix or ""
    code_prefix = code_prefix or ""
    code_suffix = code_suffix or ""
    gen_code = bool(code_prefix.strip() or code_suffix.strip())
    node_type_val = (node_type or "").strip() or None
    remark_val = (remark or "").strip() or None
    leaf_val = 1 if int(is_leaf or 0) == 1 else 0
    now = datetime.now()

    planned: List[tuple[str, str, int]] = []
    seen_codes: set[str] = set()
    for num in range(start_num, end_num + 1):
        seq = _format_seq(num, pad_width)
        name = f"{name_prefix}{seq}{name_suffix}".strip()
        if not name:
            raise ValueError("节点名称不能为空，请填写前缀或后缀")
        code = ""
        if gen_code:
            code = validate_node_code(f"{code_prefix}{seq}{code_suffix}")
            if not code:
                raise ValueError("节点编号不能为空")
            if code in seen_codes:
                raise ValueError(f"批次内节点编号重复：{code}")
            seen_codes.add(code)
            assert_sibling_node_code_unique(
                db, parent_id=pid, node_code=code, tenant_no=tenant_no
            )
        planned.append((name, code, num))

    objs: List[BizStorageFacility] = []
    for name, code, num in planned:
        obj = BizStorageFacility(
            id=generate_uuid(),
            parent_id=pid,
            node_name=name,
            node_code=code,
            node_type=node_type_val,
            is_leaf=leaf_val,
            tenant_no=tenant_no,
            order_num=num,
            remark=remark_val,
            create_by=user_id,
            create_dept_id="",
            create_time=now,
            update_by=user_id,
            update_time=now,
            del_flag=0,
        )
        db.add(obj)
        objs.append(obj)
    db.commit()
    for obj in objs:
        db.refresh(obj)
    return [_row_to_dict(obj) for obj in objs]


def update_facility(
    db: Session,
    node_id: str,
    *,
    node_name: Optional[str] = None,
    node_code: Optional[str] = None,
    node_type: Optional[str] = None,
    is_leaf: Optional[int] = None,
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
    tenant_no: Optional[str] = None,
) -> BizStorageFacility:
    obj = get_facility(db, node_id, tenant_no=tenant_no)
    if not obj:
        raise ValueError("存储设施节点不存在")
    old_node_code = (obj.node_code or "").strip()
    if node_name is not None:
        name = (node_name or "").strip()
        if not name:
            raise ValueError("节点名称不能为空")
        obj.node_name = name
    if node_code is not None:
        code = validate_node_code(node_code)
        assert_sibling_node_code_unique(
            db,
            parent_id=obj.parent_id or "0",
            node_code=code,
            tenant_no=obj.tenant_no,
            exclude_id=obj.id,
        )
        obj.node_code = code
    if node_type is not None:
        obj.node_type = (node_type or "").strip() or None
    if is_leaf is not None:
        obj.is_leaf = is_leaf
    if order_num is not None:
        obj.order_num = order_num
    if remark is not None:
        obj.remark = (remark or "").strip() or None
    obj.update_by = user_id
    obj.update_time = datetime.now()
    db.add(obj)

    node_code_changed = node_code is not None and (obj.node_code or "").strip() != old_node_code
    if node_code_changed:
        cascade_refresh_slot_name_snapshots_for_nodes(
            db,
            [node_id],
            obj.tenant_no,
            collect_descendant_ids_fn=collect_descendant_ids,
        )

    db.commit()
    db.refresh(obj)
    return obj


def soft_delete_facility(db: Session, node_id: str, tenant_no: Optional[str] = None) -> None:
    """Cascade soft-delete: node + all descendants + their slots."""
    node = get_facility(db, node_id, tenant_no=tenant_no)
    if not node:
        raise ValueError("存储设施节点不存在")
    # Collect all descendant IDs
    all_ids = [node_id] + collect_descendant_ids(db, node_id, node.tenant_no)
    now = datetime.now()
    # Soft-delete all slots belonging to these nodes
    db.query(BizStorageFacilitySlot).filter(
        BizStorageFacilitySlot.facility_node_id.in_(all_ids),
        BizStorageFacilitySlot.del_flag == 0,
    ).update({"del_flag": 1, "update_time": now}, synchronize_session=False)
    # Soft-delete all facility nodes
    db.query(BizStorageFacility).filter(
        BizStorageFacility.id.in_(all_ids),
        BizStorageFacility.del_flag == 0,
    ).update({"del_flag": 1, "update_time": now}, synchronize_session=False)
    db.commit()


# ---------------------------------------------------------------------------
# Slot helpers
# ---------------------------------------------------------------------------


def _slot_to_dict(
    s: BizStorageFacilitySlot,
    facility_by_id: Optional[Dict[str, BizStorageFacility]] = None,
) -> Dict[str, Any]:
    occupied_count = s.occupied_count if s.occupied_count is not None else 0
    full_slot_code = ""
    if facility_by_id is not None:
        full_slot_code = build_full_slot_code(s.facility_node_id, s.slot_code, facility_by_id)
    return {
        "id": s.id,
        "facilityNodeId": s.facility_node_id,
        "slotCode": s.slot_code or "",
        "fullSlotCode": full_slot_code,
        "slotStatus": s.slot_status or "",
        "occupiedCount": int(occupied_count),
        "tenantNo": s.tenant_no,
        "orderNum": s.order_num if s.order_num is not None else 0,
        "remark": s.remark or "",
        "createTime": s.create_time.strftime("%Y-%m-%d %H:%M:%S") if s.create_time else "",
        "updateTime": s.update_time.strftime("%Y-%m-%d %H:%M:%S") if s.update_time else "",
    }


def aggregate_slot_stats_by_facility(*, query) -> List[Dict[str, Any]]:
    """按设施叶子节点聚合格子总数与占用数（单次 GROUP BY，供树节点徽章展示）。"""
    rows = (
        query.with_entities(
            BizStorageFacilitySlot.facility_node_id,
            func.count(BizStorageFacilitySlot.id).label("total"),
            func.sum(
                case((BizStorageFacilitySlot.slot_status == "占用", 1), else_=0)
            ).label("occupied"),
        )
        .group_by(BizStorageFacilitySlot.facility_node_id)
        .all()
    )
    result: List[Dict[str, Any]] = []
    for facility_node_id, total, occupied in rows:
        total_int = int(total or 0)
        occupied_int = int(occupied or 0)
        result.append(
            {
                "facilityNodeId": facility_node_id,
                "total": total_int,
                "occupied": occupied_int,
                "empty": total_int - occupied_int,
            }
        )
    return result


def list_slots(
    db: Session,
    *,
    facility_node_id: str,
    tenant_no: Optional[str] = None,
) -> List[Dict[str, Any]]:
    q = db.query(BizStorageFacilitySlot).filter(
        and_(
            BizStorageFacilitySlot.facility_node_id == facility_node_id,
            BizStorageFacilitySlot.del_flag == 0,
        )
    )
    if tenant_no:
        q = q.filter(BizStorageFacilitySlot.tenant_no == tenant_no)
    rows = q.order_by(BizStorageFacilitySlot.order_num.asc(), BizStorageFacilitySlot.create_time.asc()).all()
    facility_by_id = load_facility_map(db, tenant_no or "") if tenant_no else {}
    items = [_slot_to_dict(x, facility_by_id) for x in rows]
    if tenant_no:
        from app.crud import storage_occupancy as occupancy_svc

        items = occupancy_svc.enrich_slots_with_stored_cell_products(db, tenant_no, items)
    return items


def _is_slot_available_row(row: Dict[str, Any]) -> bool:
    status = row.get("slotStatus") or ""
    occupied = int(row.get("occupiedCount") or 0)
    return status == "空" or occupied == 0


def _slot_select_display_name(row: Dict[str, Any]) -> str:
    full = (row.get("fullSlotCode") or "").strip()
    code = (row.get("slotCode") or "").strip()
    return full or code or str(row.get("id") or "")


def _slot_available_filter():
    """空格子：状态为「空」或 occupied_count 为 0 / NULL。"""
    return or_(
        BizStorageFacilitySlot.slot_status == "空",
        BizStorageFacilitySlot.occupied_count == 0,
        BizStorageFacilitySlot.occupied_count.is_(None),
    )


def _facility_node_ids_matching_keyword(
    db: Session,
    tenant_no: str,
    keyword: str,
) -> set[str]:
    like = f"%{keyword.strip()}%"
    return {
        row[0]
        for row in db.query(BizStorageFacility.id)
        .filter(
            BizStorageFacility.tenant_no == tenant_no,
            BizStorageFacility.del_flag == 0,
            or_(
                BizStorageFacility.node_name.like(like),
                BizStorageFacility.node_code.like(like),
            ),
        )
        .all()
    }


def _slot_matches_select_keyword(
    slot: BizStorageFacilitySlot,
    keyword: str,
    facility_by_id: Dict[str, BizStorageFacility],
    matching_node_ids: set[str],
) -> bool:
    """下拉关键词：完整 fullSlotCode 子串 + 备注 + 设施节点名/编号。"""
    kw = keyword.strip().lower()
    if not kw:
        return True
    row = _slot_to_dict(slot, facility_by_id)
    display = _slot_select_display_name(row).lower()
    if kw in display:
        return True
    remark = (row.get("remark") or "").lower()
    if kw in remark:
        return True
    if slot.facility_node_id in matching_node_ids:
        return True
    return False


def _leaf_node_ids_for_path_prefix(
    facility_by_id: Dict[str, BizStorageFacility],
    path_prefix: str,
) -> set[str]:
    """按设施 node_code 路径前缀/子串匹配叶子节点（储物格挂在节点上）。"""
    prefix = (path_prefix or "").strip().lower()
    if not prefix:
        return set()
    result: set[str] = set()
    for node_id in facility_by_id:
        path = build_node_code_path(node_id, facility_by_id).lower()
        if not path:
            continue
        if (
            prefix in path
            or path in prefix
            or path.startswith(f"{prefix}-")
            or prefix.startswith(f"{path}-")
        ):
            result.add(node_id)
    return result


def _build_node_path_cache(
    facility_by_id: Dict[str, BizStorageFacility],
) -> Dict[str, str]:
    return {
        node_id: build_node_code_path(node_id, facility_by_id)
        for node_id in facility_by_id
    }


def _exact_node_ids_for_path(
    path_cache: Dict[str, str],
    path: str,
) -> List[str]:
    target = (path or "").strip().lower()
    if not target:
        return []
    return [
        node_id
        for node_id, node_path in path_cache.items()
        if (node_path or "").strip().lower() == target
    ]


def _collect_slot_host_node_ids(
    path_cache: Dict[str, str],
    facility_by_id: Dict[str, BizStorageFacility],
    path: str,
) -> List[str]:
    """储物格只挂在叶子节点；路径命中非叶子（如 1-1 架子）时展开其下全部叶子层。"""
    target = (path or "").strip().lower()
    if not target:
        return []

    anchor_ids = _exact_node_ids_for_path(path_cache, path)
    if not anchor_ids:
        return []

    host_ids: List[str] = []
    seen: set[str] = set()
    child_prefix = f"{target}-"

    for anchor_id in anchor_ids:
        anchor = facility_by_id.get(anchor_id)
        if anchor and int(getattr(anchor, "is_leaf", 0) or 0) == 1:
            if anchor_id not in seen:
                seen.add(anchor_id)
                host_ids.append(anchor_id)
            continue

        for node_id, node_path in path_cache.items():
            if node_id in seen:
                continue
            node = facility_by_id.get(node_id)
            if not node or int(getattr(node, "is_leaf", 0) or 0) != 1:
                continue
            np = (node_path or "").strip().lower()
            if np.startswith(child_prefix):
                seen.add(node_id)
                host_ids.append(node_id)

    return host_ids


def _resolve_path_keyword(
    path_cache: Dict[str, str],
    keyword: str,
) -> tuple[Optional[str], Optional[str]]:
    """
    解析路径型储物格编号关键词。
    - '1-1-2-' -> ('1-1-2', None) 整盒
    - '1-1-2-1' -> ('1-1-2', '1')  精确格位
    - '1-1-2'   -> ('1-1-2', None) 若存在该节点路径
    """
    kw = (keyword or "").strip()
    if not kw or "-" not in kw:
        return None, None

    if kw.endswith("-"):
        path = kw.rstrip("-").strip()
        if path and _exact_node_ids_for_path(path_cache, path):
            return path, None
        return None, None

    known_paths = {
        (path or "").strip().lower()
        for path in path_cache.values()
        if (path or "").strip()
    }
    parts = kw.split("-")
    for i in range(len(parts), 0, -1):
        candidate = "-".join(parts[:i]).strip()
        if not candidate:
            continue
        if candidate.lower() not in known_paths:
            continue
        slot_part = "-".join(parts[i:]).strip() if i < len(parts) else ""
        return candidate, slot_part or None

    return None, None


def _build_slot_keyword_sql_filters(
    db: Session,
    tenant_no: str,
    keyword: str,
    facility_by_id: Dict[str, BizStorageFacility],
    matching_node_ids: set[str],
):
    """SQL 预筛：slot_code / remark / 设施节点 + 路径型关键词分段，缩小 Python 校验范围。"""
    kw = keyword.strip()
    like = f"%{kw}%"
    filters = [
        BizStorageFacilitySlot.slot_code.like(like),
        BizStorageFacilitySlot.remark.like(like),
    ]
    if matching_node_ids:
        filters.append(BizStorageFacilitySlot.facility_node_id.in_(list(matching_node_ids)))

    path_cache = _build_node_path_cache(facility_by_id)
    path_prefix, slot_part = _resolve_path_keyword(path_cache, kw)
    if path_prefix:
        host_nodes = _collect_slot_host_node_ids(path_cache, facility_by_id, path_prefix)
        if host_nodes:
            filters.append(BizStorageFacilitySlot.facility_node_id.in_(host_nodes))
            if slot_part:
                filters.append(BizStorageFacilitySlot.slot_code.like(f"{slot_part}%"))
    elif "-" in kw:
        prefix, loose_slot_part = kw.rsplit("-", 1)
        prefix = prefix.strip()
        loose_slot_part = loose_slot_part.strip()
        if loose_slot_part:
            filters.append(BizStorageFacilitySlot.slot_code.like(f"%{loose_slot_part}%"))
        if prefix:
            path_node_ids = _leaf_node_ids_for_path_prefix(facility_by_id, prefix)
            if path_node_ids:
                filters.append(BizStorageFacilitySlot.facility_node_id.in_(list(path_node_ids)))
    return filters


# ---------------------------------------------------------------------------
# Slot select options (remote dropdown)
# ---------------------------------------------------------------------------

SLOT_SELECT_DEFAULT_PAGE_SIZE = 20
SLOT_SELECT_MAX_PAGE_SIZE = 50
SLOT_SELECT_KEYWORD_SCAN_LIMIT = 120


def _apply_slot_select_base_filters(
    query,
    *,
    available_only: bool = False,
    include_slot_ids: Optional[List[str]] = None,
):
    include_set = {
        str(x).strip()
        for x in (include_slot_ids or [])
        if str(x).strip()
    }
    filtered = query
    if available_only:
        availability = _slot_available_filter()
        if include_set:
            filtered = filtered.filter(
                or_(BizStorageFacilitySlot.id.in_(list(include_set)), availability)
            )
        else:
            filtered = filtered.filter(availability)
    return filtered


def _search_slot_select_matched_ids(
    db: Session,
    filtered,
    tenant_no: str,
    keyword: str,
    *,
    max_results: int,
) -> List[str]:
    """关键词匹配储物格 ID（限量扫描，路径型编码优先精确匹配）。"""
    kw = (keyword or "").strip()
    if not kw or max_results <= 0:
        return []

    facility_by_id = load_facility_map(db, tenant_no)
    path_cache = _build_node_path_cache(facility_by_id)
    matching_node_ids = _facility_node_ids_matching_keyword(db, tenant_no, kw)

    matched_ids: List[str] = []
    seen: set[str] = set()

    def collect(rows: List[BizStorageFacilitySlot]) -> bool:
        for slot in rows:
            sid = slot.id
            if sid in seen:
                continue
            if _slot_matches_select_keyword(slot, kw, facility_by_id, matching_node_ids):
                seen.add(sid)
                matched_ids.append(sid)
                if len(matched_ids) >= max_results:
                    return True
        return False

    order_clause = (
        BizStorageFacilitySlot.order_num.asc(),
        BizStorageFacilitySlot.create_time.asc(),
    )

    # 快路径：路径型编码 1-1-2- / 1-1-2 / 1-1-2-1 → 设施路径 + 可选格位前缀（非叶子展开子层）
    path_prefix, slot_part = _resolve_path_keyword(path_cache, kw)
    if path_prefix:
        host_nodes = _collect_slot_host_node_ids(path_cache, facility_by_id, path_prefix)
        if host_nodes:
            exact_q = filtered.filter(
                BizStorageFacilitySlot.facility_node_id.in_(host_nodes)
            )
            if slot_part:
                exact_q = exact_q.filter(
                    BizStorageFacilitySlot.slot_code.like(f"{slot_part}%")
                )
            exact_rows = (
                exact_q.order_by(*order_clause)
                .limit(max(max_results * 2, 10))
                .all()
            )
            if collect(exact_rows):
                return matched_ids
            if matched_ids:
                return matched_ids

    keyword_filters = _build_slot_keyword_sql_filters(
        db, tenant_no, kw, facility_by_id, matching_node_ids
    )
    sql_q = filtered.filter(or_(*keyword_filters)).order_by(*order_clause)

    offset = 0
    batch_size = 40
    while len(matched_ids) < max_results and offset < SLOT_SELECT_KEYWORD_SCAN_LIMIT:
        rows = sql_q.offset(offset).limit(batch_size).all()
        if not rows:
            break
        if collect(rows):
            return matched_ids
        offset += batch_size

    return matched_ids


def _apply_slot_select_query_filters(
    db: Session,
    query,
    *,
    tenant_no: str,
    keyword: Optional[str] = None,
    available_only: bool = False,
    include_slot_ids: Optional[List[str]] = None,
):
    """兼容旧调用：无关键词时等同 base；有关键词时返回 ID 过滤后的 query。"""
    filtered = _apply_slot_select_base_filters(
        query,
        available_only=available_only,
        include_slot_ids=include_slot_ids,
    )
    kw = (keyword or "").strip()
    if not kw:
        return filtered
    matched_ids = _search_slot_select_matched_ids(
        db,
        filtered,
        tenant_no,
        kw,
        max_results=SLOT_SELECT_KEYWORD_SCAN_LIMIT,
    )
    if not matched_ids:
        return filtered.filter(false())
    return filtered.filter(BizStorageFacilitySlot.id.in_(matched_ids))


def list_slot_select_options(
    db: Session,
    *,
    query,
    tenant_no: str,
    keyword: Optional[str] = None,
    available_only: bool = False,
    include_slot_ids: Optional[List[str]] = None,
    page: int = 1,
    page_size: int = SLOT_SELECT_DEFAULT_PAGE_SIZE,
) -> tuple[List[Dict[str, Any]], int]:
    """储物格下拉远程选项：默认 20 条；关键词检索限量扫描 + 路径快路径。"""
    page = max(int(page or 1), 1)
    page_size = max(
        min(int(page_size or SLOT_SELECT_DEFAULT_PAGE_SIZE), SLOT_SELECT_MAX_PAGE_SIZE),
        1,
    )
    need_count = page * page_size

    filtered = _apply_slot_select_base_filters(
        query,
        available_only=available_only,
        include_slot_ids=include_slot_ids,
    )
    kw = (keyword or "").strip()
    order_clause = (
        BizStorageFacilitySlot.order_num.asc(),
        BizStorageFacilitySlot.create_time.asc(),
    )

    if kw:
        matched_ids = _search_slot_select_matched_ids(
            db,
            filtered,
            tenant_no,
            kw,
            max_results=need_count,
        )
        total = len(matched_ids)
        page_ids = matched_ids[(page - 1) * page_size : page * page_size]
        if not page_ids:
            return [], total
        rows_by_id = {
            row.id: row
            for row in filtered.filter(BizStorageFacilitySlot.id.in_(page_ids)).all()
        }
        rows = [rows_by_id[sid] for sid in page_ids if sid in rows_by_id]
    else:
        total = (
            filtered.order_by(None)
            .with_entities(func.count(BizStorageFacilitySlot.id))
            .scalar()
            or 0
        )
        rows = (
            filtered.order_by(*order_clause)
            .offset((page - 1) * page_size)
            .limit(page_size)
            .all()
        )

    if not rows:
        return [], int(total)

    facility_by_id = load_facility_map(db, tenant_no)
    result_list = []
    for slot_row in rows:
        row = _slot_to_dict(slot_row, facility_by_id)
        result_list.append(
            {
                "id": row.get("id"),
                "name": _slot_select_display_name(row),
                "fullSlotCode": row.get("fullSlotCode") or "",
                "slotCode": row.get("slotCode") or "",
                "facilityNodeId": row.get("facilityNodeId") or "",
                "slotStatus": row.get("slotStatus") or "",
                "occupiedCount": int(row.get("occupiedCount") or 0),
            }
        )
    return result_list, int(total)


def get_slot(db: Session, slot_id: str, tenant_no: Optional[str] = None) -> Optional[BizStorageFacilitySlot]:
    q = db.query(BizStorageFacilitySlot).filter(
        and_(BizStorageFacilitySlot.id == slot_id, BizStorageFacilitySlot.del_flag == 0)
    )
    if tenant_no:
        q = q.filter(BizStorageFacilitySlot.tenant_no == tenant_no)
    return q.first()


def _slot_to_dict_for_row(db: Session, s: BizStorageFacilitySlot) -> Dict[str, Any]:
    facility_by_id = load_facility_map(db, s.tenant_no)
    return _slot_to_dict(s, facility_by_id)


def create_slot(
    db: Session,
    *,
    facility_node_id: str,
    slot_code: Optional[str] = None,
    slot_status: Optional[str] = None,
    tenant_no: str = "zkxw",
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
    at_row_num: Optional[int] = None,
) -> BizStorageFacilitySlot:
    fid = (facility_node_id or "").strip()
    if not fid:
        raise ValueError("所属设施节点不能为空")
    if at_row_num is not None:
        return insert_slot_at_row_end(
            db,
            facility_node_id=fid,
            row_num=at_row_num,
            slot_status=slot_status,
            tenant_no=tenant_no,
            remark=remark,
            user_id=user_id,
        )
    obj = BizStorageFacilitySlot(
        id=generate_uuid(),
        facility_node_id=fid,
        slot_code=(slot_code or "").strip() or None,
        slot_status=(slot_status or "").strip() or None,
        tenant_no=tenant_no,
        order_num=order_num if order_num is not None else 0,
        remark=(remark or "").strip() or None,
        create_by=user_id,
        create_dept_id="",
        create_time=datetime.now(),
        update_by=user_id,
        update_time=datetime.now(),
        del_flag=0,
    )
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


def insert_slot_at_row_end(
    db: Session,
    *,
    facility_node_id: str,
    row_num: int,
    slot_status: Optional[str] = None,
    tenant_no: str = "zkxw",
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
) -> BizStorageFacilitySlot:
    fid = (facility_node_id or "").strip()
    row = int(row_num)
    if row < 1:
        raise ValueError("行号参数不合法")

    node = db.query(BizStorageFacility).filter(
        and_(BizStorageFacility.id == fid, BizStorageFacility.del_flag == 0)
    ).first()
    if not node:
        raise ValueError("所属设施节点不存在")
    if not node.is_leaf:
        raise ValueError("只能为叶子节点创建格子")

    max_col = 0
    for slot in _list_facility_slots(db, fid, tenant_no):
        slot_row, slot_col = _resolve_slot_layout_position(slot)
        if slot_row == row:
            max_col = max(max_col, slot_col)
            _ensure_slot_layout_order(slot, user_id=user_id)

    now = datetime.now()
    obj = BizStorageFacilitySlot(
        id=generate_uuid(),
        facility_node_id=fid,
        slot_code=None,
        slot_status=(slot_status or "空").strip() or "空",
        tenant_no=tenant_no,
        order_num=encode_slot_layout_order(row, max_col + 1),
        remark=(remark or "").strip() or None,
        create_by=user_id,
        create_dept_id="",
        create_time=now,
        update_by=user_id,
        update_time=now,
        del_flag=0,
    )
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


def update_slot(
    db: Session,
    slot_id: str,
    *,
    slot_code: Optional[str] = None,
    slot_status: Optional[str] = None,
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
    tenant_no: Optional[str] = None,
) -> BizStorageFacilitySlot:
    obj = get_slot(db, slot_id, tenant_no=tenant_no)
    if not obj:
        raise ValueError("存储设施小格不存在")
    old_slot_code = (obj.slot_code or "").strip()
    if slot_code is not None:
        obj.slot_code = (slot_code or "").strip() or None
    if slot_status is not None:
        obj.slot_status = (slot_status or "").strip() or None
    if order_num is not None:
        obj.order_num = order_num
    if remark is not None:
        obj.remark = (remark or "").strip() or None
    obj.update_by = user_id
    obj.update_time = datetime.now()
    db.add(obj)

    slot_code_changed = slot_code is not None and (obj.slot_code or "").strip() != old_slot_code
    if slot_code_changed:
        cascade_refresh_slot_name_snapshots_for_slots(db, [slot_id], obj.tenant_no)

    db.commit()
    db.refresh(obj)
    return obj


def soft_delete_slot(db: Session, slot_id: str, tenant_no: Optional[str] = None, user_id: Optional[str] = None) -> None:
    obj = get_slot(db, slot_id, tenant_no=tenant_no)
    if not obj:
        raise ValueError("存储设施小格不存在")
    obj.del_flag = 1
    obj.update_time = datetime.now()
    obj.update_by = user_id
    db.add(obj)
    db.commit()


def clear_slots_by_facility_node(
    db: Session,
    *,
    facility_node_id: str,
    tenant_no: str,
    user_id: Optional[str] = None,
) -> int:
    fid = (facility_node_id or "").strip()
    if not fid:
        raise ValueError("所属设施节点不能为空")
    node = db.query(BizStorageFacility).filter(
        and_(
            BizStorageFacility.id == fid,
            BizStorageFacility.del_flag == 0,
            BizStorageFacility.tenant_no == tenant_no,
        )
    ).first()
    if not node:
        raise ValueError("所属设施节点不存在")
    now = datetime.now()
    updated = db.query(BizStorageFacilitySlot).filter(
        BizStorageFacilitySlot.facility_node_id == fid,
        BizStorageFacilitySlot.del_flag == 0,
        BizStorageFacilitySlot.tenant_no == tenant_no,
    ).update(
        {"del_flag": 1, "update_time": now, "update_by": user_id},
        synchronize_session=False
    )
    db.commit()
    return int(updated or 0)


# ---------------------------------------------------------------------------
# Slot layout & sequential code helpers
# ---------------------------------------------------------------------------


def _resolve_slot_layout_position(slot: BizStorageFacilitySlot) -> tuple[int, int]:
    order = int(slot.order_num or 0)
    row, col = decode_slot_layout_order(order)
    if row > 0:
        return row, col
    match = re.match(r"^(.*?)(\d+)-(\d+)$", (slot.slot_code or "").strip())
    if match:
        return int(match.group(2)), int(match.group(3))
    return 0, 0


def _ensure_slot_layout_order(
    slot: BizStorageFacilitySlot,
    *,
    user_id: Optional[str] = None,
) -> tuple[int, int]:
    row, col = _resolve_slot_layout_position(slot)
    if row > 0:
        expected = encode_slot_layout_order(row, col)
        if int(slot.order_num or 0) != expected:
            slot.order_num = expected
            if user_id:
                slot.update_by = user_id
            slot.update_time = datetime.now()
        return row, col
    return 0, 0


def _list_facility_slots(
    db: Session,
    facility_node_id: str,
    tenant_no: str,
) -> List[BizStorageFacilitySlot]:
    return (
        db.query(BizStorageFacilitySlot)
        .filter(
            BizStorageFacilitySlot.facility_node_id == facility_node_id,
            BizStorageFacilitySlot.del_flag == 0,
            BizStorageFacilitySlot.tenant_no == tenant_no,
        )
        .order_by(
            BizStorageFacilitySlot.order_num.asc(),
            BizStorageFacilitySlot.create_time.asc(),
        )
        .all()
    )


def batch_create_slots(
    db: Session,
    *,
    facility_node_id: str,
    rows: int,
    cols: int,
    tenant_no: str = "zkxw",
    user_id: Optional[str] = None,
) -> List[Dict[str, Any]]:
    fid = (facility_node_id or "").strip()
    if not fid:
        raise ValueError("所属设施节点不能为空")
    if rows < 1 or cols < 1:
        raise ValueError("行数和列数必须大于 0")
    if rows > 50 or cols > 50:
        raise ValueError("单次最多生成 50×50 = 2500 个格子")
    node = db.query(BizStorageFacility).filter(
        and_(BizStorageFacility.id == fid, BizStorageFacility.del_flag == 0)
    ).first()
    if not node:
        raise ValueError("所属设施节点不存在")
    if not node.is_leaf:
        raise ValueError("只能为叶子节点创建格子")
    now = datetime.now()
    slots: List[BizStorageFacilitySlot] = []
    seq = 0
    for r in range(1, rows + 1):
        for c in range(1, cols + 1):
            seq += 1
            obj = BizStorageFacilitySlot(
                id=generate_uuid(),
                facility_node_id=fid,
                slot_code=str(seq),
                slot_status="空",
                tenant_no=tenant_no,
                order_num=encode_slot_layout_order(r, c),
                remark=None,
                create_by=user_id,
                create_dept_id="",
                create_time=now,
                update_by=user_id,
                update_time=now,
                del_flag=0,
            )
            db.add(obj)
            slots.append(obj)
    db.commit()
    facility_by_id = load_facility_map(db, tenant_no)
    for s in slots:
        db.refresh(s)
    return [_slot_to_dict(s, facility_by_id) for s in slots]


def insert_row_and_shift_slots(
    db: Session,
    *,
    facility_node_id: str,
    after_row_num: int,
    cols: int,
    tenant_no: str = "zkxw",
    user_id: Optional[str] = None,
) -> Dict[str, int]:
    fid = (facility_node_id or "").strip()
    if not fid:
        raise ValueError("所属设施节点不能为空")
    if after_row_num < 0:
        raise ValueError("插入行号参数不合法")
    if cols < 1:
        raise ValueError("列数必须大于 0")

    node = db.query(BizStorageFacility).filter(
        and_(
            BizStorageFacility.id == fid,
            BizStorageFacility.del_flag == 0,
            BizStorageFacility.tenant_no == tenant_no,
        )
    ).first()
    if not node:
        raise ValueError("所属设施节点不存在")
    if not node.is_leaf:
        raise ValueError("只能为叶子节点新增格子行")

    slots = _list_facility_slots(db, fid, tenant_no)

    now = datetime.now()
    shifted_count = 0
    for slot in slots:
        row_no, col_no = _ensure_slot_layout_order(slot, user_id=user_id)
        if row_no <= 0:
            continue
        if row_no > after_row_num:
            slot.order_num = encode_slot_layout_order(row_no + 1, col_no)
            slot.update_by = user_id
            slot.update_time = now
            shifted_count += 1

    insert_row_num = after_row_num + 1
    created_slots: List[BizStorageFacilitySlot] = []
    for col in range(1, cols + 1):
        created_slots.append(
            BizStorageFacilitySlot(
                id=generate_uuid(),
                facility_node_id=fid,
                slot_code=None,
                slot_status="空",
                tenant_no=tenant_no,
                order_num=encode_slot_layout_order(insert_row_num, col),
                remark=None,
                create_by=user_id,
                create_dept_id="",
                create_time=now,
                update_by=user_id,
                update_time=now,
                del_flag=0,
            )
        )
    if created_slots:
        db.add_all(created_slots)
    db.commit()
    return {"shiftedCount": shifted_count, "createdCount": len(created_slots)}