from __future__ import annotations

from datetime import datetime
from typing import Optional

from sqlalchemy import DateTime, ForeignKey, Integer, String, Text, Float
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.sql import func

from .database import Base


class ScheduleRun(Base):
    __tablename__ = "schedule_runs"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    schedule_id: Mapped[str] = mapped_column(String, ForeignKey("schedules.id", ondelete="CASCADE"), nullable=False)
    task_id: Mapped[Optional[str]] = mapped_column(String, ForeignKey("tasks.id", ondelete="SET NULL"))
    status: Mapped[str] = mapped_column(String, nullable=False)
    started_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    completed_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True))
    duration: Mapped[Optional[float]] = mapped_column(Float)
    error_message: Mapped[Optional[str]] = mapped_column(Text)
    output: Mapped[Optional[str]] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())

    schedule: Mapped["Schedule"] = relationship("Schedule", back_populates="runs")
    task: Mapped[Optional["Task"]] = relationship("Task", back_populates="schedule_runs")

    def __repr__(self) -> str:  # pragma: no cover - debug helper
        return f"<ScheduleRun id={self.id} schedule_id={self.schedule_id} status={self.status}>"