"""Maintenance window ORM model for scheduled maintenance periods.

Maintenance windows allow operators to define time periods during which
alerts are suppressed for specific devices (or all devices in a tenant).
"""

import uuid
from datetime import datetime

from sqlalchemy import Boolean, DateTime, ForeignKey, Text, VARCHAR, func
from sqlalchemy.dialects.postgresql import JSONB, UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class MaintenanceWindow(Base):
    """Scheduled maintenance window with optional alert suppression.

    device_ids is a JSONB array of device UUID strings.
    An empty array means "all devices in tenant".
    """
    __tablename__ = "maintenance_windows"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
        server_default=func.gen_random_uuid(),
    )
    tenant_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("tenants.id", ondelete="CASCADE"),
        nullable=False,
    )
    name: Mapped[str] = mapped_column(VARCHAR(200), nullable=False)
    device_ids: Mapped[list] = mapped_column(
        JSONB,
        nullable=False,
        server_default="'[]'::jsonb",
    )
    start_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
    )
    end_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
    )
    suppress_alerts: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        default=True,
        server_default="true",
    )
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_by: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id", ondelete="SET NULL"),
        nullable=True,
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )

    def __repr__(self) -> str:
        return f"<MaintenanceWindow id={self.id} name={self.name!r}>"