from typing import Optional
from decimal import Decimal
from sqlalchemy import Integer, String, DECIMAL, PrimaryKeyConstraint, DateTime, ForeignKeyConstraint, UniqueConstraint, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column
from core.database import Base


class ExchangeRate(Base):
    __tablename__ = "exchange_rate"
    __table_args__ = (
        PrimaryKeyConstraint('id', name='exchange_rate_pkey'),
        ForeignKeyConstraint(['tenant_id'], ['a76.tenants.id'], name='fk_exchange_rate_tenant'),
        UniqueConstraint('date', 'tenant_id', name='uq_exchange_rate_date_tenant'),
        {"schema": "a76"}
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    date: Mapped[int] = mapped_column(DateTime)
    value: Mapped[Optional[Decimal]] = mapped_column(DECIMAL(13, 6))
    local_currency: Mapped[Optional[str]] = mapped_column(String(7))
    foreign_currency: Mapped[Optional[str]] = mapped_column(String(7))    
    tenant_id: Mapped[int] = mapped_column(Integer, nullable=False, index=True)