# inventory-backend/app/api/v1/scrap.py
from flask import Blueprint, request, jsonify
from flask_jwt_extended import jwt_required, get_jwt_identity, get_jwt
from app.utils.decorators import permission_required, get_current_company_filter
from app.services.auth_service import AuthService
from app.extensions import db
from app.models.transaction import TransScrap, TransRepair
from app.models.inbound.buy import StockBuy
from app.models.inbound.semi import StockSemi
from app.models.inbound.product import StockProduct
from app.models.base import MaterialBase
from app.models.system import SysUser
import traceback
import math

scrap_bp = Blueprint('scrap', __name__, url_prefix='/scrap')


# ==============================================================================
# 报废记录字段级权限过滤（对齐 outbound 的 filter_item_by_permissions）
#
# 原先 /records 无条件剥离 cost_at_scrap / total_loss，导致即使角色持有
# scrap_list:loss_amount 也看不到金额——与「损失金额」权限元素的存在相矛盾。
# 改为按权限决定可见性，与出库记录保持一致。
# ==============================================================================
def filter_scrap_by_permissions(item, user_permissions):
    field_to_perm = {
        'total_loss': 'scrap_list:loss_amount',
        'loss_amount': 'scrap_list:loss_amount',
    }
    if 'scrap_list:*' in user_permissions:
        return item
    for field, perm_code in field_to_perm.items():
        if field in item and perm_code not in user_permissions:
            item[field] = None
    for sub in (item.get('items') or []):
        if isinstance(sub, dict):
            filter_scrap_by_permissions(sub, user_permissions)
    return item


# ==============================================================================
# 辅助函数：获取当前用户的完整权限列表（基于角色查询）
# ==============================================================================
def get_current_user_permissions():
    from flask_jwt_extended import get_jwt
    from app.services.auth_service import AuthService
    claims = get_jwt()
    user_role = claims.get('role')
    user_company = claims.get('company_name', '')
    if not user_role:
        return []
    if user_role.upper() == 'SUPER_ADMIN':
        return ['scrap_list:*']
    perm_dict = AuthService.get_user_permissions(user_role, company_name=user_company)
    perms = perm_dict.get('menus', []) + perm_dict.get('elements', [])
    return perms


# --------------------------------------------------------
# 1. 扫码查询库存接口 (关联三个库存表)
# GET /api/v1/scrap/scan?barcode=...
# --------------------------------------------------------
@scrap_bp.route('/scan', methods=['GET'])
@jwt_required()
@permission_required('scrap_selection')
def scan_barcode():
    barcode = request.args.get('barcode')
    if not barcode:
        return jsonify({'code': 400, 'msg': '请提供条码'}), 400

    try:
        result = ScrapService.get_stock_by_barcode(barcode)
        if result:
            # ★ Fail-Closed: 扫码响应剥离价格字段
            result.pop('price', None)
            return jsonify({'code': 200, 'msg': '扫描成功', 'data': result})
        else:
            return jsonify({'code': 404, 'msg': '未找到对应的库存记录'}), 404
    except Exception as e:
        import traceback
        traceback.print_exc()  # 强制在控制台打印真实错误堆栈
        return jsonify({"code": 500, "msg": f"服务器内部错误详情: {str(e)}"}), 500


# --------------------------------------------------------
# 2. 提交报废单接口
# POST /api/v1/scrap
# --------------------------------------------------------
@scrap_bp.route('', methods=['POST'])
@jwt_required()
def create_scrap():
    claims = get_jwt()
    user_role = claims.get('role')
    user_company = claims.get('company_name', '')
    if not user_role:
        return jsonify({'code': 403, 'msg': '未授权'}), 403

    # 超级管理员直接放行
    if user_role.upper() != 'SUPER_ADMIN':
        perm_dict = AuthService.get_user_permissions(user_role, company_name=user_company)
        perms = perm_dict.get('menus', []) + perm_dict.get('elements', [])
        if 'scrap_create:operation' not in perms:
            return jsonify({'code': 403, 'msg': '权限不足'}), 403

    data = request.get_json()
    if not data:
        return jsonify({'code': 400, 'msg': '无有效数据'}), 400

    current_user_name = get_jwt_identity() or 'Unknown'

    # items 必填
    if 'items' not in data or not data['items']:
        return jsonify({'code': 400, 'msg': '报废商品列表不能为空'}), 400

    try:
        result = ScrapService.process_scrap(data, operator_name=current_user_name)
        return jsonify({'code': 200, 'msg': '报废成功', 'data': result})
    except Exception as e:
        traceback.print_exc()
        db.session.rollback()
        return jsonify({'code': 400, 'msg': str(e)}), 400


# --------------------------------------------------------
# 2.1 报废申请专用库存列表（独立权限，解耦出库选单）
# GET /api/v1/scrap/stock-list
# --------------------------------------------------------
@scrap_bp.route('/stock-list', methods=['GET'])
@jwt_required()
@permission_required('scrap_apply')
def get_scrap_stock_list():
    """
    报废申请专用库存列表 — Fail-Closed: 剥离价格字段

    与借库 /transactions/borrow/stock-list 同构：复用 _do_get_stock_list，
    但挂 scrap_apply 权限，报废申请人无需持有出库选单权限。
    """
    from app.api.v1.inbound.stock import _do_get_stock_list
    return _do_get_stock_list(permission_prefix='scrap_apply')


# --------------------------------------------------------
# 3. 报废记录查询接口
# GET /api/v1/scrap/records
# --------------------------------------------------------
@scrap_bp.route('/records', methods=['GET'])
@jwt_required()
@permission_required('scrap_list')
def get_scrap_records():
    page = request.args.get('page', 1, type=int)
    page_size = request.args.get('pageSize', 50, type=int)
    sku = request.args.get('sku', '')
    start_date = request.args.get('start_date', '')
    end_date = request.args.get('end_date', '')
    keyword = request.args.get('keyword', '')
    search_type = request.args.get('search_type', 'all')

    # ★ 高级筛选：JSON 字符串 → 条件列表
    from app.utils.advanced_filter import parse_advanced_filters
    advanced_filters = parse_advanced_filters(request.args.get('advancedFilters', ''))

    try:
        result = ScrapService.query_records(
            page=page,
            page_size=page_size,
            sku=sku,
            start_date=start_date,
            end_date=end_date,
            keyword=keyword,
            search_type=search_type,
            advanced_filters=advanced_filters,
        )
        # 损失金额按 scrap_list:loss_amount 权限决定可见性（原为无条件剥离，
        # 会让持有该权限的角色也看不到金额，与权限元素的存在相矛盾）
        perms = get_current_user_permissions()
        if 'scrap_list:*' not in perms:
            for item in (result.get('list') or []):
                filter_scrap_by_permissions(item, perms)
        return jsonify({'code': 200, 'msg': 'success', 'data': result})
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': str(e)}), 500


# ============================================================
# Service 层：报废核心逻辑
# ============================================================
class ScrapService:

    @staticmethod
    def get_stock_by_barcode(barcode):
        """根据条码查找库存"""
        if not barcode:
            return None
        clean_code = barcode.strip()

        def get_price(item, table_type):
            if table_type == 'stock_product':
                return float(item.sale_price) if item.sale_price else 0
            elif table_type == 'stock_buy':
                return float(item.pre_tax_unit_price) if item.pre_tax_unit_price else 0
            return 0

        # 1. 查询成品
        prod = StockProduct.query.filter(
            db.or_(StockProduct.barcode == clean_code, StockProduct.sku == clean_code)
        ).first()
        if prod:
            res = ScrapService._format_stock(prod, 'stock_product')
            res['price'] = get_price(prod, 'stock_product')
            return res

        # 2. 查询半成品
        semi = StockSemi.query.filter(
            db.or_(StockSemi.barcode == clean_code, StockSemi.sku == clean_code)
        ).first()
        if semi:
            res = ScrapService._format_stock(semi, 'stock_semi')
            res['price'] = 0
            return res

        # 3. 查询原材料
        buy = StockBuy.query.filter(
            db.or_(StockBuy.barcode == clean_code, StockBuy.sku == clean_code)
        ).first()
        if buy:
            res = ScrapService._format_stock(buy, 'stock_buy')
            res['price'] = get_price(buy, 'stock_buy')
            return res

        # 4. 查询维修单 (TransRepair)
        repair = TransRepair.query.filter(
            db.or_(TransRepair.sku == clean_code, TransRepair.serial_number == clean_code)
        ).filter(
            TransRepair.repair_status.notin_(['已出库', '报废转出'])
        ).first()
        if repair:
            return {
                'id': repair.id,
                'sku': repair.sku,
                'barcode': repair.sku,
                'name': repair.material_name or '维修件',
                'spec': '',
                'category': '',
                'material_type': '',
                'warehouse_loc': repair.customer_location or '',
                'stock_quantity': 1,
                'available_quantity': 1,
                'source_table': 'trans_repair',
                'price': float(repair.sale_price) if repair.sale_price else 0
            }

        return None

    @staticmethod
    def _format_stock(item, table_type):
        """格式化库存查询结果 - 使用安全 getattr 防止属性错误"""
        return {
            'id': getattr(item, 'id', None),
            'sku': getattr(item, 'sku', ''),
            'barcode': getattr(item, 'barcode', getattr(item, 'bar_code', '')),
            'name': item.base.name if getattr(item, 'base', None) else '',
            'spec': item.base.spec_model if getattr(item, 'base', None) else '',
            'category': item.base.category if getattr(item, 'base', None) else '',
            'material_type': item.base.material_type if getattr(item, 'base', None) else '',
            'warehouse_loc': getattr(item, 'warehouse_location', ''),
            'stock_quantity': float(getattr(item, 'stock_quantity', getattr(item, 'qty_stock', 0)) or 0),
            'available_quantity': float(getattr(item, 'available_quantity', getattr(item, 'qty_available', 0)) or 0),
            'source_table': table_type,
        }

    @staticmethod
    def process_scrap(data, operator_name='System'):
        """处理报废：扣减库存并记录报废单"""
        items = data.get('items', [])
        reason = data.get('reason', '')

        if not reason:
            raise ValueError('请填写报废原因')

        created_records = []

        for item in items:
            stock_id = item.get('id')
            source_table = item.get('source_table')
            scrap_qty = float(item.get('quantity', 0))

            if not stock_id or not source_table or scrap_qty <= 0:
                continue

            # 处理维修单报废
            if source_table == 'trans_repair':
                repair = TransRepair.query.get(stock_id)
                if not repair:
                    raise ValueError(f'维修单不存在: ID={stock_id}')
                
                # 更新维修单状态为报废转出
                repair.repair_status = '报废转出'
                
                # 创建报废记录
                scrap_record = TransScrap(
                    sku=repair.sku,
                    source_table='trans_repair',
                    stock_id=stock_id,
                    quantity=1,
                    reason=reason,
                    operator_name=operator_name,
                    approval_status='approved',
                    cost_at_scrap=float(repair.cost_price) if repair.cost_price else 0,
                    total_loss=float(repair.cost_price) if repair.cost_price else 0
                )
                db.session.add(scrap_record)
                created_records.append(scrap_record)
                continue

            # 获取库存记录 — ★ 修复并发：使用悲观锁防止超卖/负库存
            stock_record = None
            if source_table == 'stock_product':
                stock_record = StockProduct.query.with_for_update().get(stock_id)
            elif source_table == 'stock_semi':
                stock_record = StockSemi.query.with_for_update().get(stock_id)
            elif source_table == 'stock_buy':
                stock_record = StockBuy.query.with_for_update().get(stock_id)

            if not stock_record:
                raise ValueError(f'库存记录不存在: ID={stock_id}')

            # 检查可用数量（锁已持有，TOCTOU 窗口已消除）
            avail_qty = float(stock_record.available_quantity) if stock_record.available_quantity else 0
            if avail_qty < scrap_qty:
                raise ValueError(f"SKU {stock_record.sku} 可用库存不足，当前可用: {avail_qty}")

            # 计算损失金额
            unit_price = 0.0
            if source_table == 'stock_product':
                unit_price = float(stock_record.sale_price) if stock_record.sale_price else 0
            elif source_table == 'stock_buy':
                unit_price = float(stock_record.pre_tax_unit_price) if stock_record.pre_tax_unit_price else 0

            total_loss = round(unit_price * scrap_qty, 2)

            # 扣减库存
            stock_record.stock_quantity = float(stock_record.stock_quantity) - scrap_qty
            stock_record.available_quantity = float(stock_record.available_quantity) - scrap_qty

            # 创建报废记录
            scrap_record = TransScrap(
                sku=stock_record.sku,
                source_table=source_table,
                stock_id=stock_id,
                quantity=scrap_qty,
                reason=reason,
                operator_name=operator_name,
                approval_status='approved',
                cost_at_scrap=unit_price,
                total_loss=total_loss
            )
            db.session.add(scrap_record)
            created_records.append(scrap_record)

        db.session.commit()
        return {'count': len(created_records)}

    # ------------------------------------------------------------------
    # 辅助：用户名解析（库里存 '张三/zhangsan' 格式时取斜杠前的姓名）
    # ------------------------------------------------------------------
    @staticmethod
    def _display_name(raw):
        if raw is None or raw == '':
            return ''
        s = str(raw)
        if s.isdigit():
            u = SysUser.query.get(int(s))
            if u and u.username:
                s = u.username
        return s.split('/')[0] if '/' in s else s

    # ------------------------------------------------------------------
    # 辅助：批量解析报废行的物料名称/规格/库位/批号（多态 5 条来源路径）
    # ------------------------------------------------------------------
    @staticmethod
    def _resolve_materials(rows):
        from app.models.transaction import TransBorrow
        from sqlalchemy.orm import joinedload

        model_map = {
            'stock_buy': StockBuy,
            'stock_semi': StockSemi,
            'stock_product': StockProduct,
        }
        resolved = {}

        def _from_stock(stock_row):
            if not stock_row:
                return None
            base = getattr(stock_row, 'base', None)
            return {
                'material_name': (base.name if base else '') or '',
                'spec_model': (base.spec_model if base else '') or '',
                'warehouse_location': getattr(stock_row, 'warehouse_location', '') or '',
                'batch_number': (getattr(stock_row, 'batch_number', '')
                                 or getattr(stock_row, 'serial_number', '') or ''),
            }

        # 1) 常规库存三表：批量拉取并 joinedload 物料主表
        for table, model in model_map.items():
            ids = {r.stock_id for r in rows if r.source_table == table and r.stock_id}
            if not ids:
                continue
            for obj in model.query.options(joinedload(model.base)).filter(model.id.in_(ids)).all():
                resolved[(table, obj.id)] = _from_stock(obj)

        # 2) 借库转报废：stock_id 指向 trans_borrow.id，再经其 source_table 找库存
        borrow_ids = {r.stock_id for r in rows if r.source_table == 'trans_borrow' and r.stock_id}
        if borrow_ids:
            borrows = TransBorrow.query.filter(TransBorrow.id.in_(borrow_ids)).all()
            inner_ids = {}
            for b in borrows:
                if b.source_table in model_map and b.stock_id:
                    inner_ids.setdefault(b.source_table, set()).add(b.stock_id)
            inner_map = {}
            for table, ids in inner_ids.items():
                model = model_map[table]
                for obj in model.query.options(joinedload(model.base)).filter(model.id.in_(ids)).all():
                    inner_map[(table, obj.id)] = _from_stock(obj)
            for b in borrows:
                info = inner_map.get((b.source_table, b.stock_id))
                if info:
                    resolved[('trans_borrow', b.id)] = info

        # 3) 维修单来源：物料名在 TransRepair 上，无规格
        repair_ids = {r.stock_id for r in rows if r.source_table == 'trans_repair' and r.stock_id}
        if repair_ids:
            for rp in TransRepair.query.filter(TransRepair.id.in_(repair_ids)).all():
                resolved[('trans_repair', rp.id)] = {
                    'material_name': rp.material_name or '',
                    'spec_model': '',
                    'warehouse_location': '',
                    'batch_number': getattr(rp, 'serial_number', '') or '',
                }

        return resolved

    @staticmethod
    def query_records(page=1, page_size=50, sku='', start_date='', end_date='',
                      keyword='', search_type='all', advanced_filters=None):
        """
        分页查询报废记录 —— ★ 按报废申请单号分组，返回「订单级」结果。

        · 有 scrap_request_no：按单号分组；
        · 无单号（历史直接报废）：按 操作时间(精确到分钟) + 操作人 虚拟分组，
          并生成可读的虚拟单号，避免历史数据成为无主记录。
        每单返回 items 明细数组、损失合计、申请人（取自 ScrapApproval）。
        """
        query = TransScrap.query

        if sku:
            query = query.filter(TransScrap.sku.like(f'%{sku}%'))

        if start_date:
            query = query.filter(TransScrap.operation_time >= start_date)
        if end_date:
            query = query.filter(TransScrap.operation_time <= end_date + ' 23:59:59')

        # 单号 / SKU 可在 SQL 层直接过滤
        if keyword and search_type == 'no':
            query = query.filter(TransScrap.scrap_request_no.ilike(f'%{keyword}%'))
        elif keyword and search_type == 'sku':
            query = query.filter(TransScrap.sku.ilike(f'%{keyword}%'))

        # ====================================================================
        # ★ 高级筛选
        #
        # 报废流水在 Python 侧按「单号 / (时间+操作人) 虚拟单号」分组，
        # 且历史数据 scrap_request_no 为 NULL，无法像出库/借还那样直接对
        # 单号列做 IN。因此这里统一用**行级等价键**表达父子关系：
        #
        #   1) 先用子级条件求出「命中行」；
        #   2) 把命中行折算成"同单等价键"谓词；
        #   3) 肯定操作符 → 放行同单全部行（OR），
        #      否定操作符 → 整单排除（NOT ...）。
        #
        # 等价键：有单号 → scrap_request_no 相等；
        #         无单号 → 同一分钟 + 同一操作人（与分组逻辑完全一致）。
        # ====================================================================
        if advanced_filters:
            from app.utils.advanced_filter import (
                build_predicate, is_negative, invert_condition,
            )
            from sqlalchemy import or_, and_, tuple_, func as _func

            parent_map = {
                'no': TransScrap.scrap_request_no,
                'operator': TransScrap.operator_name,
            }
            child_map = {'sku': TransScrap.sku}

            def _order_key_pred(rows):
                """把若干命中行折算成「同单」谓词（OR 连接）"""
                keys = []
                for h in rows:
                    if h.scrap_request_no:
                        keys.append(and_(
                            TransScrap.scrap_request_no.isnot(None),
                            TransScrap.scrap_request_no == h.scrap_request_no,
                        ))
                    else:
                        keys.append(and_(
                            TransScrap.scrap_request_no.is_(None),
                            _func.date_trunc('minute', TransScrap.operation_time)
                            == _func.date_trunc('minute', h.operation_time),
                            TransScrap.operator_name == h.operator_name,
                        ))
                return or_(*keys) if keys else None

            def _matched_rows(cond):
                """按肯定形式求出「命中该子级条件的报废行」"""
                probe = invert_condition(cond)
                field = probe.get('field')
                if field == 'material_name':
                    # 物料名不在流水表：先在三张库存表求出 (source_table, stock_id)
                    # 命中集合，再用元组 IN 定位报废行。
                    # ★ 用元组 IN 而非"单号 IN"：后者对 scrap_request_no 为 NULL 的
                    #   历史行永远匹配不上，会把历史数据整体漏掉。
                    from app.models.base import MaterialBase
                    name_col = MaterialBase.name
                    name_pred = (name_col == probe.get('value')
                                 if probe.get('operator') == 'eq'
                                 else name_col.ilike(f"%{probe.get('value')}%"))
                    pairs = []
                    for SM, sv in [(StockBuy, 'stock_buy'), (StockSemi, 'stock_semi'),
                                   (StockProduct, 'stock_product')]:
                        for r in (SM.query.join(MaterialBase, SM.base_id == MaterialBase.id)
                                  .filter(name_pred).all()):
                            pairs.append((sv, r.id))
                    if not pairs:
                        return None
                    return TransScrap.query.filter(
                        tuple_(TransScrap.source_table, TransScrap.stock_id).in_(pairs)
                    ).all()

                p = build_predicate(probe, child_map)
                if p is None:
                    return None
                return TransScrap.query.filter(p).all()

            for cond in advanced_filters:
                field = cond.get('field')

                # --- 父级字段：标准 SQL 谓词，否定操作符语义无歧义 ---
                if field in parent_map:
                    p = build_predicate(cond, parent_map)
                    if p is not None:
                        query = query.filter(p)
                    continue

                if field not in child_map and field != 'material_name':
                    continue

                # --- 子级字段：正/负操作符语义分派 ---
                negative = is_negative(cond)
                rows = _matched_rows(cond)

                if not rows:
                    # 没有命中行：肯定 → 结果为空；否定 → 无需排除任何单
                    if not negative:
                        query = query.filter(db.false())
                    continue

                key_pred = _order_key_pred(rows)
                if key_pred is None:
                    continue
                query = query.filter(~key_pred if negative else key_pred)

        # 【行级数据隔离】基于 JWT 多租户公司过滤
        # 通过 stock 表或 trans_repair 关联到 MaterialBase
        company_limit = get_current_company_filter()
        if company_limit is not None:
            buy_subq = db.session.query(TransScrap.id).join(
                StockBuy, db.and_(TransScrap.stock_id == StockBuy.id,
                                  TransScrap.source_table == 'stock_buy')
            ).join(MaterialBase, StockBuy.base_id == MaterialBase.id).filter(
                MaterialBase.company_name == company_limit
            )
            semi_subq = db.session.query(TransScrap.id).join(
                StockSemi, db.and_(TransScrap.stock_id == StockSemi.id,
                                   TransScrap.source_table == 'stock_semi')
            ).join(MaterialBase, StockSemi.base_id == MaterialBase.id).filter(
                MaterialBase.company_name == company_limit
            )
            product_subq = db.session.query(TransScrap.id).join(
                StockProduct, db.and_(TransScrap.stock_id == StockProduct.id,
                                      TransScrap.source_table == 'stock_product')
            ).join(MaterialBase, StockProduct.base_id == MaterialBase.id).filter(
                MaterialBase.company_name == company_limit
            )
            repair_subq = db.session.query(TransScrap.id).join(
                TransRepair, db.and_(TransScrap.stock_id == TransRepair.id,
                                     TransScrap.source_table == 'trans_repair')
            ).join(MaterialBase, TransRepair.base_id == MaterialBase.id).filter(
                MaterialBase.company_name == company_limit
            )
            # ★ 借库转报废：stock_id 指向 trans_borrow.id，通过 borrow 关联源库存表再关联 MaterialBase
            from app.models.transaction import TransBorrow
            borrow_stock_buy = db.session.query(TransScrap.id).join(
                TransBorrow, db.and_(TransScrap.stock_id == TransBorrow.id,
                                     TransScrap.source_table == 'trans_borrow')
            ).join(StockBuy, TransBorrow.stock_id == StockBuy.id).join(
                MaterialBase, StockBuy.base_id == MaterialBase.id
            ).filter(MaterialBase.company_name == company_limit)
            borrow_stock_semi = db.session.query(TransScrap.id).join(
                TransBorrow, db.and_(TransScrap.stock_id == TransBorrow.id,
                                     TransScrap.source_table == 'trans_borrow')
            ).join(StockSemi, TransBorrow.stock_id == StockSemi.id).join(
                MaterialBase, StockSemi.base_id == MaterialBase.id
            ).filter(MaterialBase.company_name == company_limit)
            borrow_stock_product = db.session.query(TransScrap.id).join(
                TransBorrow, db.and_(TransScrap.stock_id == TransBorrow.id,
                                     TransScrap.source_table == 'trans_borrow')
            ).join(StockProduct, TransBorrow.stock_id == StockProduct.id).join(
                MaterialBase, StockProduct.base_id == MaterialBase.id
            ).filter(MaterialBase.company_name == company_limit)
            all_matches = buy_subq.union(
                semi_subq, product_subq, repair_subq,
                borrow_stock_buy, borrow_stock_semi, borrow_stock_product
            ).subquery()
            query = query.filter(TransScrap.id.in_(all_matches))

        # 按时间倒序
        query = query.order_by(TransScrap.operation_time.desc())

        # ==================================================================
        # ★ 分组：先取全量（报废量级小），在内存里按「订单」聚合后再分页
        #   有单号 → 按 scrap_request_no
        #   无单号 → 按 操作时间(分钟) + 操作人 虚拟分组
        # ==================================================================
        rows = query.all()
        mat_info = ScrapService._resolve_materials(rows)

        groups = {}
        for r in rows:
            if r.scrap_request_no:
                gkey = ('req', r.scrap_request_no)
            else:
                ts = r.operation_time.strftime('%Y-%m-%d %H:%M') if r.operation_time else '未知时间'
                gkey = ('legacy', ts, r.operator_name or '')

            g = groups.get(gkey)
            if g is None:
                op_name = ScrapService._display_name(r.operator_name)
                if gkey[0] == 'req':
                    req_no = r.scrap_request_no
                else:
                    # 虚拟单号：无单号的历史直接报废，仍给出可读标识便于追溯
                    ts_raw = r.operation_time.strftime('%Y%m%d%H%M') if r.operation_time else '000000000000'
                    req_no = f"LEGACY-{ts_raw}-{op_name or '未知'}"
                g = {
                    'scrap_request_no': req_no,
                    'is_legacy': gkey[0] == 'legacy',
                    'operator_name': op_name,
                    'applicant_id': None,
                    'applicant_name': '',
                    'scrap_time': r.operation_time.strftime('%Y-%m-%d %H:%M:%S') if r.operation_time else '',
                    '_sort_time': r.operation_time,
                    'approval_status': r.approval_status or '',
                    'total_loss': 0.0,
                    'total_quantity': 0.0,
                    'reason': r.reason or '',
                    'items': [],
                }
                groups[gkey] = g

            info = mat_info.get((r.source_table, r.stock_id), {})
            qty = float(r.quantity or 0)
            loss = float(r.total_loss or 0)
            g['total_quantity'] += qty
            g['total_loss'] += loss
            g['items'].append({
                'id': r.id,
                'sku': r.sku or '',
                'material_name': info.get('material_name', ''),
                'spec_model': info.get('spec_model', ''),
                'warehouse_location': info.get('warehouse_location', ''),
                'batch_number': info.get('batch_number', ''),
                'quantity': qty,
                'reason': r.reason or '',
                'source_table': r.source_table or '',
                'loss_amount': round(loss, 2),
            })

        orders = list(groups.values())

        # ★ 补申请人：有单号的取 ScrapApproval，无单号的以操作人兜底
        req_nos = [o['scrap_request_no'] for o in orders if not o['is_legacy']]
        if req_nos:
            from app.models.scrap_approval import ScrapApproval
            approver_cache = {}
            for ap in ScrapApproval.query.filter(
                ScrapApproval.request_no.in_(req_nos)
            ).all():
                if ap.applicant_id not in approver_cache:
                    # 统一走 _display_name，去掉 username 里的 '/账号' 后缀
                    approver_cache[ap.applicant_id] = ScrapService._display_name(
                        ScrapApproval._user_name(ap.applicant_id)
                    )
                o = groups.get(('req', ap.request_no))
                if o:
                    o['applicant_id'] = ap.applicant_id
                    o['applicant_name'] = approver_cache.get(ap.applicant_id, '')
        for o in orders:
            if not o['applicant_name']:
                o['applicant_name'] = o['operator_name']
            o['total_loss'] = round(o['total_loss'], 2)
            o['items'].sort(key=lambda x: x['sku'] or '')

        # 关键词过滤：单号/SKU 已在 SQL 层处理，这里处理操作人/申请人/物料名
        if keyword and search_type in ('all', 'name', 'material_name'):
            kw = keyword.lower()
            def _hit(o):
                if search_type == 'name':
                    return kw in (o['operator_name'] or '').lower() or kw in (o['applicant_name'] or '').lower()
                if search_type == 'material_name':
                    return any(kw in (it['material_name'] or '').lower() for it in o['items'])
                return (kw in (o['scrap_request_no'] or '').lower()
                        or kw in (o['operator_name'] or '').lower()
                        or kw in (o['applicant_name'] or '').lower()
                        or any(kw in (it['sku'] or '').lower()
                               or kw in (it['material_name'] or '').lower()
                               or kw in (it['spec_model'] or '').lower() for it in o['items']))
            orders = [o for o in orders if _hit(o)]

        orders.sort(key=lambda o: (o['_sort_time'] is None, o['_sort_time']), reverse=True)

        total = len(orders)
        start = (page - 1) * page_size
        paged = orders[start:start + page_size]

        for o in paged:
            o.pop('_sort_time', None)

        return {
            'list': paged,
            'total': total,
            'page': page,
            'pageSize': page_size
        }


# ==============================================================================
# 报废审批流（申请 → 审批 → 按单执行）—— 镜像 借库/出库 审批框架
# 与旧 /scrap（直接报废）并存，旧入口不动
# ==============================================================================

def _current_user_role():
    try:
        claims = get_jwt()
        return (claims.get('role') or '').upper()
    except Exception:
        return ''


@scrap_bp.route('/request/check-approval', methods=['POST'])
@jwt_required()
@permission_required('scrap_apply')
def scrap_check_approval():
    """
    提交前预检：报废一律需审批，本接口返回 need_approval=true，
    并附带命中「需审批物料」标记的明细，供前端展示审批提示文案。
    """
    try:
        from app.services.approval_control import resolve_approval_control
        from app.services.scrap_approval_service import SCRAP_ALWAYS_REQUIRES_APPROVAL
        data = request.get_json() or {}
        items = data.get('items', []) or []
        _, flagged = resolve_approval_control(items)
        return jsonify({'code': 200, 'msg': 'success',
                        'data': {'need_approval': SCRAP_ALWAYS_REQUIRES_APPROVAL,
                                 'materials': flagged}}), 200
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'预检失败: {str(e)}'}), 500


@scrap_bp.route('/request', methods=['POST'])
@jwt_required()
@permission_required('scrap_apply')
def create_scrap_request():
    """提交报废申请（不扣库存；扣减在库管执行时）"""
    try:
        from app.services.scrap_approval_service import ScrapApprovalService
        identity = get_jwt_identity()
        if not identity:
            return jsonify({'code': 401, 'msg': '用户未登录'}), 401
        data = request.get_json() or {}
        req = ScrapApprovalService.submit_approval(
            applicant_id=int(identity),
            items=data.get('items', []),
            allowed_approvers=data.get('allowed_approvers'),
            remark=data.get('remark'),
            approver_id=data.get('approver_id'),
            force_approval=(_current_user_role() == 'WAREHOUSE_MGR'),
        )
        return jsonify({'code': 200, 'msg': '报废申请已提交', 'data': req.to_dict()}), 200
    except ValueError as e:
        return jsonify({'code': 400, 'msg': str(e)}), 400
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'提交报废申请失败: {str(e)}'}), 500


@scrap_bp.route('/request', methods=['GET'])
@jwt_required()
@permission_required('scrap_approval')
def list_scrap_requests():
    """
    报废申请列表。
    scope: mine(我提交的,默认) / pending(待我审批) / executable(待执行) / all(管理者)
    Query: page, limit, status(可选覆盖)
    """
    try:
        from app.services.scrap_approval_service import ScrapApprovalService
        from app.utils.decorators import is_privileged_viewer
        identity = int(get_jwt_identity())

        scope = (request.args.get('scope') or 'mine').lower()
        page = int(request.args.get('page', 1))
        limit = int(request.args.get('limit', 10))
        status = request.args.get('status')
        status = int(status) if status not in (None, '', 'all') else None
        priv = is_privileged_viewer()

        kwargs = {'page': page, 'limit': limit, 'status': status}
        if scope == 'pending':
            kwargs['status'] = 0
            kwargs['approver_id'] = identity
        elif scope == 'executable':
            kwargs['status'] = 1
        elif scope == 'all':
            if not priv:
                kwargs['applicant_id'] = identity
        else:  # mine
            kwargs['applicant_id'] = identity

        data = ScrapApprovalService.get_list(**kwargs)
        return jsonify({'code': 200, 'msg': '获取成功', 'data': data}), 200
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'获取报废申请列表失败: {str(e)}'}), 500


@scrap_bp.route('/request/<int:request_id>', methods=['GET'])
@jwt_required()
@permission_required('scrap_approval')
def get_scrap_request_detail(request_id):
    try:
        from app.models.scrap_approval import ScrapApproval
        from app.utils.decorators import is_privileged_viewer
        req = db.session.get(ScrapApproval, request_id)
        if not req:
            return jsonify({'code': 404, 'msg': '报废申请不存在'}), 404
        if not is_privileged_viewer() and int(req.applicant_id) != int(get_jwt_identity()):
            # 被指定审批人也可查看
            allowed = req.get_allowed_approvers() or []
            if str(get_jwt_identity()) not in [str(a.get('value')) for a in allowed if a.get('type') == 'user']:
                return jsonify({'code': 403, 'msg': '无权查看该报废申请'}), 403
        return jsonify({'code': 200, 'msg': '获取成功', 'data': req.to_dict()}), 200
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'获取报废申请详情失败: {str(e)}'}), 500


@scrap_bp.route('/request/<int:request_id>/approve', methods=['PATCH'])
@jwt_required()
@permission_required('scrap_approval')
def approve_scrap_request(request_id):
    """审批报废申请（仅被指定审批人）"""
    try:
        from app.services.scrap_approval_service import ScrapApprovalService
        data = request.get_json() or {}
        req = ScrapApprovalService.approve(
            request_id, int(get_jwt_identity()),
            data.get('action'), data.get('reject_reason', '')
        )
        return jsonify({'code': 200, 'msg': '操作成功', 'data': req.to_dict()}), 200
    except ValueError as e:
        return jsonify({'code': 400, 'msg': str(e)}), 400
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'审批报废申请失败: {str(e)}'}), 500


@scrap_bp.route('/request/<int:request_id>/execute', methods=['POST'])
@jwt_required()
@permission_required('scrap_execute')
def execute_scrap_request(request_id):
    """
    按单报废：有 scrap_execute 权限者执行，扣减实物库存并写报废流水。

    Body: { "items": [{"source_table", "stock_id", "quantity", "name"/"sku"(可选)}, ...] }
    实扫明细必须是该申请单批准明细的子集，且累计数量不得超过批准数量。
    """
    try:
        from app.services.scrap_approval_service import ScrapApprovalService
        identity = int(get_jwt_identity())
        u = SysUser.query.get(identity)
        data = request.get_json(silent=True) or {}
        req = ScrapApprovalService.execute(
            request_id,
            operator_name=(u.username if u else str(identity)),
            scanned_items=data.get('items') or [],
        )
        return jsonify({'code': 200, 'msg': '已执行报废并扣减库存', 'data': req.to_dict()}), 200
    except ValueError as e:
        return jsonify({'code': 400, 'msg': str(e)}), 400
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'执行报废失败: {str(e)}'}), 500