"""Platform tables: user-facing notifications, audit log of clinical
mutations, per-user preferences for the dashboard / Jarvis. Used by
the corresponding router modules.

All three tables are tiny (no FK cascades, no joins) so they don't
slow patient queries; the audit_log is append-only and we trim it via
the cleanup task on startup if it ever grows past 20k rows.
"""

from __future__ import annotations

from datetime import datetime

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

from core.database import Base


class Notification(Base):
    """Lightweight notification feed for the bell dropdown."""

    __tablename__ = "notifications"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int | None] = mapped_column(
        ForeignKey("users.id", ondelete="CASCADE"), index=True, nullable=True
    )
    kind: Mapped[str] = mapped_column(String(32), nullable=False)
    severity: Mapped[str] = mapped_column(String(16), default="info", nullable=False)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    body: Mapped[str | None] = mapped_column(Text, nullable=True)
    link: Mapped[str | None] = mapped_column(String(255), nullable=True)
    patient_id: Mapped[int | None] = mapped_column(Integer, nullable=True)
    read_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False, index=True
    )


class AuditLogEntry(Base):
    """Append-only record of clinical mutations.

    Captured automatically by the helper in core.audit. Read-only from
    the API; only an admin can fetch the list.
    """

    __tablename__ = "audit_log"

    id: Mapped[int] = mapped_column(primary_key=True)
    actor_id: Mapped[int | None] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL"), index=True, nullable=True
    )
    actor_email: Mapped[str | None] = mapped_column(String(255), nullable=True)
    action: Mapped[str] = mapped_column(String(64), nullable=False)
    target_kind: Mapped[str] = mapped_column(String(32), nullable=False)
    target_id: Mapped[str | None] = mapped_column(String(64), nullable=True)
    summary: Mapped[str | None] = mapped_column(Text, nullable=True)
    payload: Mapped[dict | None] = mapped_column(JSON, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False, index=True
    )


class UserPreference(Base):
    """Per-user dashboard + Jarvis preferences (theme, lang, voice…)."""

    __tablename__ = "user_preferences"

    user_id: Mapped[int] = mapped_column(
        ForeignKey("users.id", ondelete="CASCADE"), primary_key=True
    )
    locale: Mapped[str] = mapped_column(String(8), default="en", nullable=False)
    theme: Mapped[str] = mapped_column(String(16), default="dark", nullable=False)
    voice_greetings: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    voice_alerts: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    auto_select_critical: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    compact_density: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    shortcuts_enabled: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    extras: Mapped[dict | None] = mapped_column(JSON, nullable=True)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
    )