from datetime import datetime

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

from app.database import Base


class Job(Base):
    """备份任务定义。

    source_config_json 是 Fernet 加密的 JSON：
      - mysql:      {"host", "port", "user", "password", "database"}
      - directory:  {"path", "exclude_patterns": [...]}
    """

    __tablename__ = "jobs"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    name: Mapped[str] = mapped_column(String(64), unique=True, nullable=False)
    type: Mapped[str] = mapped_column(String(16), nullable=False)  # 'mysql' / 'directory'
    source_config_json: Mapped[str] = mapped_column(Text, nullable=False)
    storage_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("storages.id", ondelete="RESTRICT"), nullable=False
    )
    cron_expression: Mapped[str | None] = mapped_column(String(64), nullable=True)
    enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    notify_on: Mapped[str] = mapped_column(
        String(16), nullable=False, default="none"
    )  # 'none' / 'failure' / 'all'
    retention_count: Mapped[int] = mapped_column(Integer, nullable=False, default=7)
    retention_days: Mapped[int | None] = mapped_column(Integer, nullable=True)
    description: Mapped[str | None] = mapped_column(String(255), nullable=True)

    storage: Mapped["Storage"] = relationship(lazy="joined")  # noqa: F821

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