"""add asset_collections and collection_assets tables

Revision ID: 0017_add_asset_collections
Revises: 0016_content_guidelines
Create Date: 2026-09-22 00:00:00.000000

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa

# revision identifiers, used by Alembic.
revision: str = "0017_add_asset_collections"
down_revision: Union[str, None] = "0016_content_guidelines"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    bind = op.get_bind()
    insp = sa.inspect(bind)
    tables = insp.get_table_names()

    if "asset_collections" not in tables:
        op.create_table(
            "asset_collections",
            sa.Column("id", sa.Integer(), primary_key=True, index=True),
            sa.Column("title", sa.String(length=255), nullable=False, index=True),
            sa.Column("description", sa.Text(), nullable=True),
            sa.Column("theme", sa.String(length=64), nullable=False, server_default="general", index=True),
            sa.Column("thumbnail_url", sa.String(length=512), nullable=True),
            sa.Column("owner_id", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False),
            sa.Column("is_public", sa.Boolean(), nullable=False, server_default=sa.text("true"), index=True),
            sa.Column("tags", sa.String(length=512), nullable=True),
            sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
            sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        )

    if "collection_assets" not in tables:
        op.create_table(
            "collection_assets",
            sa.Column("id", sa.Integer(), primary_key=True, index=True),
            sa.Column("collection_id", sa.Integer(), sa.ForeignKey("asset_collections.id", ondelete="CASCADE"), nullable=False, index=True),
            sa.Column("asset_id", sa.Integer(), sa.ForeignKey("assets.id", ondelete="CASCADE"), nullable=False, index=True),
            sa.Column("sort_order", sa.Integer(), nullable=False, server_default="0"),
            sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        )


def downgrade() -> None:
    op.drop_table("collection_assets")
    op.drop_table("asset_collections")