from __future__ import annotations

from datetime import datetime
from typing import Optional

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

from .database import Base


class Log(Base):
    __tablename__ = "logs"
    __table_args__ = (
        Index("idx_logs_created_at", "created_at"),
        Index("idx_logs_level", "level"),
        Index("idx_logs_source", "source"),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    level: Mapped[str] = mapped_column(String, nullable=False)
    source: Mapped[Optional[str]] = mapped_column(String)
    message: Mapped[str] = mapped_column(Text, nullable=False)
    details: Mapped[Optional[dict]] = mapped_column(JSON)
    host_id: Mapped[Optional[str]] = mapped_column(String, ForeignKey("hosts.id", ondelete="SET NULL"))
    task_id: Mapped[Optional[str]] = mapped_column(String, ForeignKey("tasks.id", ondelete="SET NULL"))
    schedule_id: Mapped[Optional[str]] = mapped_column(String, ForeignKey("schedules.id", ondelete="SET NULL"))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())

    host: Mapped[Optional["Host"]] = relationship("Host", back_populates="logs")
    task: Mapped[Optional["Task"]] = relationship("Task", back_populates="logs")
    schedule: Mapped[Optional["Schedule"]] = relationship("Schedule", back_populates="logs")

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