from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import CheckConstraint, DateTime, Index, String, text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from core.db.base import Base, SoftDeleteMixin, TimestampMixin
from core.db.types import json_jsonb as jsonb
from schemas.enums import NotificationTargetMode


class Notification(TimestampMixin, SoftDeleteMixin, Base):
    __tablename__ = "notifications"
    __table_args__ = (
        CheckConstraint(
            "status IN ('draft', 'published', 'revoked')",
            name="ck_notifications_status",
        ),
        CheckConstraint(
            "target_mode IN ('new_users', 'exist_users', 'all_users', 'user_ids')",
            name="ck_notifications_target_mode",
        ),
        CheckConstraint(
            "jsonb_typeof(payload) = 'object'",
            name="ck_notifications_payload_object",
        ),
        Index(
            "ix_notifications_status_created_at",
            "status",
            "created_at",
        ),
        Index(
            "ix_notifications_published_at",
            "published_at",
        ),
        Index(
            "uq_notifications_source_source_key",
            "source",
            "source_key",
            unique=True,
            postgresql_where=text("source_key IS NOT NULL"),
        ),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    type: Mapped[str] = mapped_column(
        String(32), nullable=False, server_default=text("'system'")
    )
    source: Mapped[str] = mapped_column(
        String(32), nullable=False, server_default=text("'manual'")
    )
    source_key: Mapped[str | None] = mapped_column(String(128), nullable=True)
    source_version: Mapped[int | None] = mapped_column(nullable=True)
    content_hash: Mapped[str | None] = mapped_column(String(64), nullable=True)
    title: Mapped[dict[str, str]] = mapped_column(
        jsonb,
        nullable=False,
        server_default=text("'{}'::jsonb"),
        default=dict,
    )
    body: Mapped[dict[str, str]] = mapped_column(
        jsonb,
        nullable=False,
        server_default=text("'{}'::jsonb"),
        default=dict,
    )
    payload: Mapped[dict[str, object]] = mapped_column(
        jsonb,
        nullable=False,
        server_default=text("'{}'::jsonb"),
        default=dict,
    )
    status: Mapped[str] = mapped_column(
        String(16), nullable=False, server_default=text("'published'")
    )
    target_mode: Mapped[NotificationTargetMode] = mapped_column(
        String(32), nullable=False, server_default=text("'all_users'")
    )
    published_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    revoked_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )