from datetime import datetime

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

from app.database import Base


class Run(Base):
    """单次备份执行记录。"""

    __tablename__ = "runs"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    job_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("jobs.id", ondelete="CASCADE"), nullable=False, index=True
    )
    status: Mapped[str] = mapped_column(String(16), nullable=False, default="pending")
    trigger: Mapped[str] = mapped_column(String(16), nullable=False, default="manual")
    started_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    finished_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    duration_seconds: Mapped[int | None] = mapped_column(Integer, nullable=True)
    artifact_path: Mapped[str | None] = mapped_column(String(512), nullable=True)
    artifact_size: Mapped[int | None] = mapped_column(BigInteger, nullable=True)
    artifact_checksum: Mapped[str | None] = mapped_column(String(64), nullable=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
    log_excerpt: Mapped[str | None] = mapped_column(Text, nullable=True)

    job: Mapped["Job"] = relationship(lazy="joined")  # noqa: F821
    logs: Mapped[list["RunLog"]] = relationship(  # noqa: F821
        back_populates="run", cascade="all, delete-orphan", lazy="select"
    )

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


class RunLog(Base):
    """完整日志（可独立表以避免 runs 表臃肿）。"""

    __tablename__ = "run_logs"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    run_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("runs.id", ondelete="CASCADE"), nullable=False, index=True
    )
    content: Mapped[str] = mapped_column(Text, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now(), nullable=False
    )

    run: Mapped["Run"] = relationship(back_populates="logs")