"""物料入库/出库系统 - 数据模型 (SQLAlchemy 2.0)

实体:
  User        账号(admin / manager / operator)
  Material    物料主数据
  Inbound     入库流水(含"期初"来源的首笔)
  Outbound    出库流水(含生产领用)
  Bom         BOM 清单(产品型号)
  BomItem     BOM 组成(某物料单套用量)
  ProdOrder   生产订单(接单量) -> 按 BOM 展开领料需求
  OperationLog 操作日志(谁/何时/做了什么)

库存口径: 在库 = SUM(入库) - SUM(出库), 由 app 实时聚合, 不冗余存储。
"""
import os
from datetime import datetime, date
from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()


class User(db.Model):
    __tablename__ = "user"
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, nullable=False, index=True)
    password = db.Column(db.String(128), nullable=False)  # sha256 hex
    role = db.Column(db.String(32), default="operator")   # admin / manager / operator
    display_name = db.Column(db.String(64), default="")
    active = db.Column(db.Boolean, default=True)


class Material(db.Model):
    __tablename__ = "material"
    id = db.Column(db.Integer, primary_key=True)
    part_number = db.Column(db.String(64), unique=True, nullable=False, index=True)
    manufacturer = db.Column(db.String(255), default="")   # 型号 / 规格
    unit = db.Column(db.String(16), default="个")
    safety_stock = db.Column(db.Float, default=0)          # 安全库存
    note = db.Column(db.String(255), default="")
    created_at = db.Column(db.DateTime, default=datetime.now)


class Inbound(db.Model):
    __tablename__ = "inbound"
    id = db.Column(db.Integer, primary_key=True)
    material_id = db.Column(db.Integer, db.ForeignKey("material.id"), nullable=False, index=True)
    batch_no = db.Column(db.String(64), default="")        # 批次号
    qty = db.Column(db.Float, nullable=False)              # 入库数量(正)
    operator = db.Column(db.String(64), default="")        # 经手人
    source = db.Column(db.String(255), default="")         # 来源 / 供应商
    occur_date = db.Column(db.Date, default=date.today)
    remark = db.Column(db.String(255), default="")
    created_at = db.Column(db.DateTime, default=datetime.now)


class Outbound(db.Model):
    __tablename__ = "outbound"
    id = db.Column(db.Integer, primary_key=True)
    material_id = db.Column(db.Integer, db.ForeignKey("material.id"), nullable=False, index=True)
    batch_no = db.Column(db.String(64), default="")        # 批次号
    qty = db.Column(db.Float, nullable=False)              # 出库数量(正)
    operator = db.Column(db.String(64), default="")        # 经手人
    purpose = db.Column(db.String(255), default="")        # 用途
    order_ref = db.Column(db.String(64), default="")       # 关联生产单号
    occur_date = db.Column(db.Date, default=date.today)
    remark = db.Column(db.String(255), default="")
    created_at = db.Column(db.DateTime, default=datetime.now)


# ---------------- M2: BOM 与生产订单 ----------------
class Bom(db.Model):
    __tablename__ = "bom"
    id = db.Column(db.Integer, primary_key=True)
    code = db.Column(db.String(64), unique=True, nullable=False, index=True)  # BOM 型号简码
    name = db.Column(db.String(255), default="")
    note = db.Column(db.String(255), default="")
    created_at = db.Column(db.DateTime, default=datetime.now)


class BomItem(db.Model):
    __tablename__ = "bom_item"
    id = db.Column(db.Integer, primary_key=True)
    bom_id = db.Column(db.Integer, db.ForeignKey("bom.id"), nullable=False, index=True)
    material_id = db.Column(db.Integer, db.ForeignKey("material.id"), nullable=False, index=True)
    qty_per_unit = db.Column(db.Float, nullable=False, default=0)   # 单套用量


class ProdOrder(db.Model):
    __tablename__ = "prod_order"
    id = db.Column(db.Integer, primary_key=True)
    order_no = db.Column(db.String(64), unique=True, nullable=False, index=True)
    bom_id = db.Column(db.Integer, db.ForeignKey("bom.id"), nullable=False, index=True)
    qty = db.Column(db.Float, nullable=False, default=0)            # 接单量(台/套)
    status = db.Column(db.String(32), default="planned")            # planned / picked / closed
    operator = db.Column(db.String(64), default="")
    remark = db.Column(db.String(255), default="")
    created_at = db.Column(db.DateTime, default=datetime.now)


# ---------------- M3: 操作日志 ----------------
class OperationLog(db.Model):
    __tablename__ = "operation_log"
    id = db.Column(db.Integer, primary_key=True)
    operator = db.Column(db.String(64), default="")
    action = db.Column(db.String(64), default="")     # 动作分类
    target = db.Column(db.String(255), default="")    # 对象
    detail = db.Column(db.String(512), default="")    # 详情
    created_at = db.Column(db.DateTime, default=datetime.now)