bambuddy/backend/app/models/maintenance.py

"""Maintenance tracking models."""

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

from backend.app.core.database import Base


class MaintenanceType(Base):
    """Defines a type of maintenance task with default interval."""
    __tablename__ = "maintenance_types"

    id: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column(String(100))
    description: Mapped[str | None] = mapped_column(Text)
    default_interval_hours: Mapped[float] = mapped_column(Float, default=100.0)
    icon: Mapped[str | None] = mapped_column(String(50))  # Icon name for UI
    is_system: Mapped[bool] = mapped_column(Boolean, default=False)  # Pre-defined vs custom
    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now()
    )

    # Relationships
    printer_maintenance: Mapped[list["PrinterMaintenance"]] = relationship(
        back_populates="maintenance_type", cascade="all, delete-orphan"
    )


class PrinterMaintenance(Base):
    """Tracks maintenance status for a specific printer."""
    __tablename__ = "printer_maintenance"

    id: Mapped[int] = mapped_column(primary_key=True)
    printer_id: Mapped[int] = mapped_column(ForeignKey("printers.id", ondelete="CASCADE"))
    maintenance_type_id: Mapped[int] = mapped_column(ForeignKey("maintenance_types.id", ondelete="CASCADE"))

    # Custom interval for this printer (overrides default if set)
    custom_interval_hours: Mapped[float | None] = mapped_column(Float, nullable=True)

    # Tracking
    enabled: Mapped[bool] = mapped_column(Boolean, default=True)
    last_performed_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    last_performed_hours: Mapped[float] = mapped_column(Float, default=0.0)  # Hours at last reset

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

    # Relationships
    printer: Mapped["Printer"] = relationship(back_populates="maintenance_items")
    maintenance_type: Mapped["MaintenanceType"] = relationship(back_populates="printer_maintenance")
    history: Mapped[list["MaintenanceHistory"]] = relationship(
        back_populates="printer_maintenance", cascade="all, delete-orphan"
    )


class MaintenanceHistory(Base):
    """Log of maintenance actions performed."""
    __tablename__ = "maintenance_history"

    id: Mapped[int] = mapped_column(primary_key=True)
    printer_maintenance_id: Mapped[int] = mapped_column(
        ForeignKey("printer_maintenance.id", ondelete="CASCADE")
    )
    performed_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
    hours_at_maintenance: Mapped[float] = mapped_column(Float, default=0.0)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)

    # Relationships
    printer_maintenance: Mapped["PrinterMaintenance"] = relationship(back_populates="history")


# Import at end to avoid circular imports
from backend.app.models.printer import Printer  # noqa: E402