"""categories and channel_categories

Revision ID: 0003_categories
Revises: 0002_oauth_channels
Create Date: 2026-09-16

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa

revision: str = "0003_categories"
down_revision: Union[str, None] = "0002_oauth_channels"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "categories",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("name", sa.String(length=255), nullable=False),
        sa.Column("slug", sa.String(length=255), nullable=False),
        sa.Column("sort_order", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.UniqueConstraint("name", name="uq_categories_name"),
        sa.UniqueConstraint("slug", name="uq_categories_slug"),
    )

    op.create_table(
        "channel_categories",
        sa.Column("channel_id", sa.Integer(), sa.ForeignKey("channels.id"), primary_key=True),
        sa.Column(
            "category_id",
            sa.Integer(),
            sa.ForeignKey("categories.id", ondelete="CASCADE"),
            primary_key=True,
        ),
    )


def downgrade() -> None:
    op.drop_table("channel_categories")
    op.drop_table("categories")