"""add pmflow changeset committer

Revision ID: 20260505_add_pmflow_changeset_committer
Revises: 20260503_add_pmflow_ai_feedback_events
Create Date: 2026-05-05
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa


revision = "20260505_add_pmflow_changeset_committer"
down_revision = "20260503_add_pmflow_ai_feedback_events"
branch_labels = None
depends_on = None


def _column_exists(bind, table_name: str, column_name: str) -> bool:
    if not sa.inspect(bind).has_table(table_name):
        return False
    return any(column["name"] == column_name for column in sa.inspect(bind).get_columns(table_name))


def _index_exists(bind, table_name: str, index_name: str) -> bool:
    if not sa.inspect(bind).has_table(table_name):
        return False
    return any(index["name"] == index_name for index in sa.inspect(bind).get_indexes(table_name))


def upgrade() -> None:
    bind = op.get_bind()
    if not _column_exists(bind, "pmflow_change_sets", "committed_by"):
        op.add_column("pmflow_change_sets", sa.Column("committed_by", sa.BigInteger(), sa.ForeignKey("users.id"), nullable=True))
    if not _index_exists(bind, "pmflow_change_sets", "ix_pmflow_change_sets_committed_by"):
        op.create_index("ix_pmflow_change_sets_committed_by", "pmflow_change_sets", ["committed_by"], unique=False)


def downgrade() -> None:
    bind = op.get_bind()
    if _index_exists(bind, "pmflow_change_sets", "ix_pmflow_change_sets_committed_by"):
        op.drop_index("ix_pmflow_change_sets_committed_by", table_name="pmflow_change_sets")
    if _column_exists(bind, "pmflow_change_sets", "committed_by"):
        op.drop_column("pmflow_change_sets", "committed_by")