import json


def collect_tokens(cfg):
    vlans = cfg.get('vlans', [])
    vlan_names = [v.get('name', '') for v in vlans]
    filter_opts = '<option value="all">All VLANs</option>' + ''.join(
        f'<option value="{n}">{n}</option>' for n in vlan_names
    )
    return {
        'PROTOCOL_OPTIONS': json.dumps([
            {'value': 'tcp',  'label': 'TCP'},
            {'value': 'udp',  'label': 'UDP'},
            {'value': 'both', 'label': 'TCP/UDP'},
        ]),
        'VLAN_FILTER_OPTIONS':   filter_opts,
        'VLAN_NAMES_AS_OPTIONS': json.dumps([{'value': n, 'label': n} for n in vlan_names]),
        'VLAN_SUBNET_INFO_JSON': json.dumps({
            v.get('name', ''): {'subnet': v.get('subnet', ''), 'prefix': v.get('subnet_mask', 0)}
            for v in vlans if v.get('name') and v.get('subnet')
        }),
    }