"""Transaction model - 交易记录."""

from __future__ import annotations
from datetime import datetime
from decimal import Decimal
from sqlalchemy import String, Text, DateTime, Numeric, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.models.database import Base


class Transaction(Base):
    __tablename__ = "transactions"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    case_id: Mapped[int] = mapped_column(ForeignKey("cases.id", ondelete="CASCADE"), index=True)
    screenshot_id: Mapped[int] = mapped_column(ForeignKey("screenshots.id", ondelete="CASCADE"), index=True)
    app_source: Mapped[str] = mapped_column(String(128))
    transaction_type: Mapped[str] = mapped_column(String(32))  # 转出/转入/消费/收款/提现/充值
    amount: Mapped[Decimal] = mapped_column(Numeric(18, 2))
    currency: Mapped[str] = mapped_column(String(16), default="CNY")
    counterparty_name: Mapped[str | None] = mapped_column(String(256), nullable=True)
    counterparty_account: Mapped[str | None] = mapped_column(String(512), nullable=True)
    order_number: Mapped[str | None] = mapped_column(String(128), nullable=True)
    transaction_time: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    remark: Mapped[str | None] = mapped_column(Text, nullable=True)
    raw_text: Mapped[str | None] = mapped_column(Text, nullable=True)
    confidence: Mapped[str] = mapped_column(String(16), default="medium")  # high | medium | low
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)

    case: Mapped["Case"] = relationship("Case", back_populates="transactions")
    screenshot: Mapped["Screenshot"] = relationship("Screenshot", back_populates="transactions")

    def __repr__(self) -> str:
        return f"<Transaction(id={self.id}, amount={self.amount}, app={self.app_source})>"