import uuid
from datetime import date, datetime
from decimal import Decimal

from sqlalchemy import Boolean, Date, DateTime, ForeignKey, Numeric, String, Text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base


class Budget(Base):
    __tablename__ = "budgets"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    category_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("categories.id"), nullable=False)
    name: Mapped[str] = mapped_column(Text, nullable=False)
    amount: Mapped[Decimal] = mapped_column(Numeric(20, 8), nullable=False)
    currency: Mapped[str] = mapped_column(String(10), nullable=False)
    period: Mapped[str] = mapped_column(String(20), nullable=False)  # weekly|monthly|quarterly|yearly
    start_date: Mapped[date] = mapped_column(Date, nullable=False)
    end_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    rollover: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    alert_threshold: Mapped[Decimal] = mapped_column(Numeric(5, 2), default=80, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)

    category: Mapped["Category"] = relationship(back_populates="budgets", lazy="noload")  # type: ignore[name-defined]