"""add document_shares table

Revision ID: 0004
Revises: 0003
Create Date: 2026-04-18

"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0004"
down_revision: Union[str, None] = "0003"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "document_shares",
        sa.Column("id", sa.String(), nullable=False),
        sa.Column("document_id", sa.String(), nullable=False),
        sa.Column("group_id", sa.String(), nullable=False),
        sa.Column("shared_by_user_id", sa.String(), nullable=False),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("now()"),
            nullable=False,
        ),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("document_id", "group_id", name="uq_document_group_share"),
    )
    op.create_index("ix_document_shares_document_id", "document_shares", ["document_id"])
    op.create_index("ix_document_shares_group_id", "document_shares", ["group_id"])


def downgrade() -> None:
    op.drop_index("ix_document_shares_group_id", table_name="document_shares")
    op.drop_index("ix_document_shares_document_id", table_name="document_shares")
    op.drop_table("document_shares")