"""Add photofilename to directoryemployees (self-hosted employee photos).

The core chain (7d16_directoryemployees) created directoryemployees WITHOUT a
photofilename column. This plugin revision adds it, so BOTH fresh installs (core
chain builds the table, then this adds the column) and existing installs get it.
Guarded/idempotent: skips when the table is absent (plugin disabled) or the
column already exists (e.g. a test DB built by db.create_all() from the model).

Revision ID: employees0002photo
Revises: employees0001anchor
"""
from alembic import op
import sqlalchemy as sa


revision = 'employees0002photo'
down_revision = 'employees0001anchor'
branch_labels = None
depends_on = None


def upgrade():
    bind = op.get_bind()
    insp = sa.inspect(bind)
    if 'directoryemployees' not in insp.get_table_names():
        return
    cols = {c['name'] for c in insp.get_columns('directoryemployees')}
    if 'photofilename' not in cols:
        op.add_column('directoryemployees',
                      sa.Column('photofilename', sa.String(length=255), nullable=True))


def downgrade():
    bind = op.get_bind()
    insp = sa.inspect(bind)
    if 'directoryemployees' not in insp.get_table_names():
        return
    cols = {c['name'] for c in insp.get_columns('directoryemployees')}
    if 'photofilename' in cols:
        op.drop_column('directoryemployees', 'photofilename')
