import uuid
from datetime import datetime

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

from app.db.base import Base


class Category(Base):
    __tablename__ = "categories"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=True, index=True)
    name: Mapped[str] = mapped_column(Text, nullable=False)
    parent_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("categories.id"), nullable=True)
    type: Mapped[str] = mapped_column(String(20), nullable=False)  # income | expense | transfer
    icon: Mapped[str | None] = mapped_column(Text, nullable=True)
    color: Mapped[str | None] = mapped_column(String(7), nullable=True)
    is_system: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    sort_order: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)

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