from datetime import datetime

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

from app.database import Base


class Problem(Base):
    __tablename__ = "problems"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    host_id: Mapped[int | None] = mapped_column(ForeignKey("hosts.id"), index=True)
    title: Mapped[str] = mapped_column(String(256))
    summary: Mapped[str] = mapped_column(Text)
    severity: Mapped[str] = mapped_column(String(16), index=True)
    status: Mapped[str] = mapped_column(String(32), index=True, default="open")
    resolved_by: Mapped[str | None] = mapped_column(String(16))
    rule_id: Mapped[str | None] = mapped_column(String(64))
    fingerprint: Mapped[str] = mapped_column(String(128), index=True)
    event_count: Mapped[int] = mapped_column(Integer, default=1)
    last_seen_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )

    host: Mapped["Host | None"] = relationship()
    event_links: Mapped[list["ProblemEvent"]] = relationship(back_populates="problem")


class ProblemEvent(Base):
    __tablename__ = "problem_events"

    problem_id: Mapped[int] = mapped_column(ForeignKey("problems.id", ondelete="CASCADE"), primary_key=True)
    event_id: Mapped[int] = mapped_column(ForeignKey("events.id", ondelete="CASCADE"), primary_key=True)

    problem: Mapped["Problem"] = relationship(back_populates="event_links")
    event: Mapped["Event"] = relationship()