"""add study role permissions

Revision ID: 20260512_03
Revises: 20260512_02
Create Date: 2026-05-12 10:45:00.000000

"""

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql


revision: str = "20260512_03"
down_revision: Union[str, None] = "20260512_02"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def _table_exists(inspector: sa.Inspector, table_name: str) -> bool:
    return table_name in inspector.get_table_names()


def upgrade() -> None:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    if _table_exists(inspector, "study_role_permissions"):
        return

    op.create_table(
        "study_role_permissions",
        sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("study_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("role", sa.String(length=20), nullable=False),
        sa.Column("module", sa.String(length=80), nullable=False),
        sa.Column("can_read", sa.Boolean(), server_default="false", nullable=False),
        sa.Column("can_write", sa.Boolean(), server_default="false", nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.ForeignKeyConstraint(["study_id"], ["studies.id"]),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("study_id", "role", "module", name="uq_study_role_permissions_study_role_module"),
    )
    op.create_index("ix_study_role_permissions_study_id", "study_role_permissions", ["study_id"])
    op.create_index("ix_study_role_permissions_role", "study_role_permissions", ["role"])


def downgrade() -> None:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    if not _table_exists(inspector, "study_role_permissions"):
        return

    op.drop_index("ix_study_role_permissions_role", table_name="study_role_permissions")
    op.drop_index("ix_study_role_permissions_study_id", table_name="study_role_permissions")
    op.drop_table("study_role_permissions")