"""Задел под титулы/ачивки: users.title_achievement_slug + таблица user_achievements.

Сами определения ачивок хранятся файлами (settings.achievements_dir), в БД — только
будущая выдача игрокам. Идемпотентна (как 0003/0004): на свежей БД (0001 = create_all из
актуальных моделей) столбец/таблица уже есть → no-op; на существующей — добавляет.

Revision ID: 0005_achievements
Revises: 0004_user_profile
Create Date: 2026-06-17
"""
from typing import Sequence, Union

import sqlalchemy as sa
from sqlalchemy import inspect

from alembic import op

revision: str = "0005_achievements"
down_revision: Union[str, None] = "0004_user_profile"
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)

    cols = {c["name"] for c in insp.get_columns("users")}
    if "title_achievement_slug" not in cols:
        with op.batch_alter_table("users") as b:
            b.add_column(sa.Column("title_achievement_slug", sa.String(64), nullable=True))

    if "user_achievements" not in insp.get_table_names():
        op.create_table(
            "user_achievements",
            sa.Column("id", sa.Integer(), primary_key=True),
            sa.Column(
                "user_id",
                sa.Integer(),
                sa.ForeignKey("users.id", ondelete="CASCADE"),
                nullable=False,
            ),
            sa.Column("achievement_slug", sa.String(64), nullable=False),
            sa.Column("earned_at", sa.DateTime(), nullable=False),
            sa.UniqueConstraint("user_id", "achievement_slug", name="uq_user_achievement"),
        )
        op.create_index(
            "ix_user_achievements_user_id", "user_achievements", ["user_id"]
        )


def downgrade() -> None:
    bind = op.get_bind()
    insp = inspect(bind)
    if "user_achievements" in insp.get_table_names():
        op.drop_table("user_achievements")
    with op.batch_alter_table("users") as b:
        try:
            b.drop_column("title_achievement_slug")
        except Exception:  # noqa: BLE001
            pass