"""Уведомления: таблица notifications (персистентные уведомления игроку).

Идемпотентна (как 0006/0007): на свежей БД таблицу создаёт 0001 (create_all); на существующей —
create_table здесь.

Revision ID: 0008_notifications
Revises: 0007_match_attachments
Create Date: 2026-06-26
"""
from typing import Sequence, Union

import sqlalchemy as sa
from sqlalchemy import inspect

from alembic import op

revision: str = "0008_notifications"
down_revision: Union[str, None] = "0007_match_attachments"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    bind = op.get_bind()
    insp = inspect(bind)
    if "notifications" in insp.get_table_names():
        return
    op.create_table(
        "notifications",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column(
            "user_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("type", sa.String(32), nullable=False),
        sa.Column("title", sa.String(255), nullable=False),
        sa.Column("body", sa.Text(), nullable=True),
        sa.Column("link", sa.String(255), nullable=True),
        sa.Column("read_at", sa.DateTime(), nullable=True),
        sa.Column("created_at", sa.DateTime(), nullable=False),
    )
    op.create_index("ix_notifications_user_id", "notifications", ["user_id"])
    op.create_index("ix_notifications_created_at", "notifications", ["created_at"])
    op.create_index(
        "ix_notifications_user_created", "notifications", ["user_id", "created_at"]
    )


def downgrade() -> None:
    bind = op.get_bind()
    insp = inspect(bind)
    if "notifications" in insp.get_table_names():
        op.drop_table("notifications")