"""inventory 财务域模型：收付款交易与订单分摊。"""
from sqlalchemy import Column, Integer, String, Text, DateTime, Numeric, ForeignKey
from sqlalchemy.sql import func
from sqlalchemy.orm import relationship

from shared.models.base import Base


class FinanceTransaction(Base):
    __tablename__ = "finance_transactions"

    id = Column(Integer, primary_key=True, index=True)
    txn_no = Column(String(50), unique=True, index=True, nullable=False)
    txn_type = Column(String(20), nullable=False, index=True)
    partner_type = Column(String(20), nullable=False, index=True)
    partner_id = Column(Integer, nullable=False, index=True)
    amount = Column(Numeric(12, 2), nullable=False)
    txn_date = Column(DateTime, default=func.now(), index=True)
    method = Column(String(30), default="bank")
    account_name = Column(String(100), nullable=True)
    status = Column(String(20), default="confirmed", index=True)
    remark = Column(Text, nullable=True)
    operator_id = Column(Integer, ForeignKey("users.id"), nullable=True)
    created_at = Column(DateTime, default=func.now(), index=True)

    allocations = relationship("FinanceAllocation", back_populates="transaction", cascade="all, delete-orphan")

    def __repr__(self):
        return f"<FinanceTransaction(txn_no='{self.txn_no}', txn_type='{self.txn_type}', amount={self.amount})>"


class FinanceAllocation(Base):
    __tablename__ = "finance_allocations"

    id = Column(Integer, primary_key=True, index=True)
    transaction_id = Column(Integer, ForeignKey("finance_transactions.id"), nullable=False, index=True)
    order_type = Column(String(20), nullable=False, index=True)
    order_id = Column(Integer, nullable=False, index=True)
    allocated_amount = Column(Numeric(12, 2), nullable=False)
    created_at = Column(DateTime, default=func.now(), index=True)

    transaction = relationship("FinanceTransaction", back_populates="allocations")

    def __repr__(self):
        return f"<FinanceAllocation(transaction_id={self.transaction_id}, order_type='{self.order_type}', amount={self.allocated_amount})>"