{%- if messages | length > 1 -%}
    {{ raise_exception('Embedding models should only embed one message at a time') }}
{%- endif -%}

{% set vars = namespace(prefix='', images=[], texts=[]) %}
{%- for message in messages -%}
    {%- if message['role'] == 'query' -%}
        {%- set vars.prefix = 'query: ' %}
    {%- elif message['role'] == 'document' -%}
        {%- set vars.prefix = 'passage: ' %}
    {%- endif -%}
    {%- for content in message['content'] -%}
        {%- if content['type'] == 'text' -%}
            {%- set vars.texts = vars.texts + [content['text']] %}
        {%- elif content['type'] == 'image' -%}
            {%- set vars.images = vars.images + ['<image> '] %}
        {%- endif -%}
    {%- endfor -%}
{%- endfor -%}
{{- bos_token }}{{ vars.prefix }}{{ (vars.images + vars.texts) | join('') }}