from datetime import datetime, date
from typing import Optional, Any
from sqlalchemy import String, Integer, Boolean, Date, DateTime, ForeignKey, func
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.orm import Mapped, mapped_column
from app.database import Base


class RecurringTask(Base):
    __tablename__ = "recurring_tasks"

    id:          Mapped[int]  = mapped_column(primary_key=True)
    title:       Mapped[str]  = mapped_column(String(255), nullable=False)
    assigned_to: Mapped[Optional[int]] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    created_by:  Mapped[int]  = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False)

    # Recurrence pattern
    recurrence_type:   Mapped[str]  = mapped_column(String(30), nullable=False)
    recurrence_config: Mapped[dict] = mapped_column(JSONB, nullable=False)

    # Trigger settings
    trigger_mode: Mapped[str] = mapped_column(String(20), nullable=False, default="on_schedule")
    advance_days: Mapped[int] = mapped_column(Integer, nullable=False, default=0)

    # State
    is_active:          Mapped[bool]          = mapped_column(Boolean, nullable=False, default=True)
    last_generated_due: Mapped[Optional[date]] = mapped_column(Date, nullable=True)

    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), onupdate=func.now())