from __future__ import annotations

from datetime import datetime

from sqlalchemy import DateTime, Float, ForeignKey, Integer, JSON, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base, TimestampMixin, UUIDPrimaryKeyMixin


class Alarm(UUIDPrimaryKeyMixin, TimestampMixin, Base):
    __tablename__ = "alarms"

    mine_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("mines.id", ondelete="CASCADE"), index=True
    )
    sensor_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("sensors.id", ondelete="SET NULL"), nullable=True
    )
    alarm_no: Mapped[str] = mapped_column(String(64), unique=True, index=True)
    alarm_type: Mapped[str] = mapped_column(String(64), index=True)
    level: Mapped[str] = mapped_column(String(16), index=True)
    title: Mapped[str] = mapped_column(String(255))
    content: Mapped[str] = mapped_column(Text, default="")
    value: Mapped[float | None] = mapped_column(Float, nullable=True)
    threshold: Mapped[float | None] = mapped_column(Float, nullable=True)
    status: Mapped[str] = mapped_column(String(32), default="open", index=True)
    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), index=True)
    acknowledged_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    closed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    metadata_json: Mapped[dict] = mapped_column("metadata", JSON, default=dict)


class WorkOrder(UUIDPrimaryKeyMixin, TimestampMixin, Base):
    __tablename__ = "work_orders"

    mine_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("mines.id", ondelete="CASCADE"), index=True
    )
    alarm_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("alarms.id", ondelete="SET NULL"), nullable=True
    )
    diagnosis_result_id: Mapped[str | None] = mapped_column(
        String(32), ForeignKey("diagnosis_results.id", ondelete="SET NULL"), nullable=True
    )
    order_no: Mapped[str] = mapped_column(String(64), unique=True, index=True)
    title: Mapped[str] = mapped_column(String(255))
    content: Mapped[str] = mapped_column(Text, default="")
    priority: Mapped[str] = mapped_column(String(16), default="medium", index=True)
    status: Mapped[str] = mapped_column(String(32), default="pending", index=True)
    assignee_id: Mapped[str] = mapped_column(String(64), default="")
    assignee_name: Mapped[str] = mapped_column(String(128), default="")
    department: Mapped[str] = mapped_column(String(128), default="")
    due_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    verified_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    closed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    result: Mapped[str] = mapped_column(Text, default="")
    attachments: Mapped[list] = mapped_column(JSON, default=list)
    metadata_json: Mapped[dict] = mapped_column("metadata", JSON, default=dict)


class WorkOrderEvent(UUIDPrimaryKeyMixin, Base):
    __tablename__ = "work_order_events"

    work_order_id: Mapped[str] = mapped_column(
        String(32), ForeignKey("work_orders.id", ondelete="CASCADE"), index=True
    )
    event_type: Mapped[str] = mapped_column(String(32), index=True)
    from_status: Mapped[str] = mapped_column(String(32), default="")
    to_status: Mapped[str] = mapped_column(String(32), default="")
    operator_id: Mapped[str] = mapped_column(String(64), default="")
    operator_name: Mapped[str] = mapped_column(String(128), default="")
    comment: Mapped[str] = mapped_column(Text, default="")
    attachments: Mapped[list] = mapped_column(JSON, default=list)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), index=True)