"""events.camera source type

Revision ID: 004_camera_enum
Revises: 003_news
Create Date: 2026-08-25
"""

from alembic import op

revision = '004_camera_enum'
down_revision = '003_news'
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Postgres enums have no IF NOT EXISTS for values — guard manually so the
    # migration stays idempotent across restarts.
    op.execute("""
        DO $$
        BEGIN
            IF NOT EXISTS (
                SELECT 1 FROM pg_enum e
                JOIN pg_type t ON t.oid = e.enumtypid
                WHERE t.typname = 'event_source_type' AND e.enumlabel = 'camera'
            ) THEN
                ALTER TYPE event_source_type ADD VALUE 'camera';
            END IF;
        END
        $$;
    """)


def downgrade() -> None:
    # Enum value removal is not supported by Postgres; leave it in place.
    pass