"""Notification models."""

from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import (
    Boolean,
    DateTime,
    ForeignKey,
    Index,
    String,
    Text,
    UniqueConstraint,
    func,
)
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin


class Notification(Base, TenantMixin):
    """User notification entity."""

    __tablename__ = "notifications"
    __table_args__ = (
        Index("ix_notifications_tenant_user_read", "tenant_id", "user_id", "read_at"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    type: Mapped[str] = mapped_column(String(20), nullable=False)
    title: Mapped[str] = mapped_column(String(200), nullable=False)
    body: Mapped[str | None] = mapped_column(Text, nullable=True)
    read_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )


class NotificationType(Base):
    """Registered notification type from a plugin."""

    __tablename__ = "notification_types"
    __table_args__ = (Index("ix_notification_types_key", "type_key"),)

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    type_key: Mapped[str] = mapped_column(String(20), nullable=False, unique=True)
    plugin_name: Mapped[str] = mapped_column(String(100), nullable=False)
    category: Mapped[str] = mapped_column(String(50), nullable=False, default="general")
    label: Mapped[str] = mapped_column(String(200), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    is_enabled_by_default: Mapped[bool] = mapped_column(
        Boolean, nullable=False, default=True
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )


class NotificationPreference(Base, TenantMixin):
    """User preference for a notification type (opt-in/opt-out)."""

    __tablename__ = "notification_preferences"
    __table_args__ = (
        UniqueConstraint("user_id", "type_key", name="uq_notif_pref_user_type"),
        Index("ix_notif_prefs_user", "user_id"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
    )
    type_key: Mapped[str] = mapped_column(String(20), nullable=False)
    is_enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)