{%- if not messages %}
    {{- raise_exception('No messages provided.') }}
{%- endif %}
{%- set image_count = namespace(value=0) %}
{%- set image_placeholder = '<|vision_start|><|image_pad|><|vision_end|>' -%}
{%- set mode = mode | default('content') -%}
{%- if template -%}{%- set mode = 'structured' -%}{%- endif -%}
{%- if not template and mode == 'structured' %}
    {{- raise_exception('`structured` mode specified but no `template` provided.') }}
{%- endif %}
{%- if mode not in ['structured', 'content', 'template-generation', 'document-detection', 'markdown'] -%}{%- set mode = 'content' -%}{%- endif -%}
{%- if mode == 'markdown' %}{%- set mode = 'content' -%}{%- endif %}
{%- set enable_thinking = enable_thinking | default(False) -%}
{%- if mode not in ['structured', 'content'] and enable_thinking %}
    {{- raise_exception('`enable_thinking` can only be `True` for `structured` and `content` modes.') }}
{%- endif %}
{%- set has_examples = namespace(flag=false) -%}
{%- if mode != 'structured' -%}{%- set has_examples = false -%}{%- endif -%}
{# MACRO TO RENDER MESSAGE CONTENT #}
{%- macro render_content(content, do_vision_count, is_system_content=false) %}
    {%- if content is string %}
        {{- content }}
    {%- elif content is iterable and content is not mapping %}
        {%- for item in content %}
            {%- if 'image' in item or 'image_url' in item or item.type == 'image' %}
                {%- if is_system_content %}
                    {{- raise_exception('System message cannot contain images.') }}
                {%- endif %}
                {%- if do_vision_count %}
                    {%- set image_count.value = image_count.value + 1 %}
                {%- endif %}
                {%- if add_vision_id %}
                    {{- 'Picture ' ~ image_count.value ~ ': ' }}
                {%- endif %}
                {{- '<|vision_start|><|image_pad|><|vision_end|>\n' }}
            {%- elif 'text' in item %}
                {{- item.text + '\n' }}
            {%- else %}
                {{- raise_exception('Unexpected item type in content.') }}
            {%- endif %}
        {%- endfor %}
    {%- elif content is none or content is undefined %}
        {{- '' }}
    {%- else %}
        {{- raise_exception('Unexpected content type.') }}
    {%- endif %}
{%- endmacro %}
{# SYSTEM MESSAGE #}
{%- if messages[0].role == 'system' %}
    {%- set content = render_content(messages[0].content, false, true)|trim %}
    {{- '<|im_start|>system\n' + content + '<|im_end|>\n' }}
{%- endif %}
{# USER MESSAGE #}
{{- '<|im_start|>user\n' -}}
{{- '【task】' + mode|replace("-", " ") + '\n' -}}
{# Template Section (for structured task): specifies template, instructions, examples, previous_output #}
{%- if mode == 'structured' -%}
    {{- '【template_start】' + template + '【template_end】\n' -}}
    {# Instructions Section #}
    {%- if instructions -%}
        {{- '【instructions_start】' + instructions + '【instructions_end】\n'-}}
    {%- endif -%}
    {# Examples Section (only for extraction tasks) #}
    {%- for message in messages -%}
        {%- if message.role == 'developer' and 'content' in message -%}
            {# Validate that there is at least one input and one output contents #}
            {%- set example_inputs = message.content[:-1] -%}
            {%- set example_output_part = message.content[-1] -%}
            {%- if example_inputs|length > 0 -%}
                {%- if not has_examples.flag -%}
                    {{- '【examples_start】\n' -}}
                    {%- set has_examples.flag = true -%}
                {%- endif -%}
                {{- '【example_input_start】' + render_content(example_inputs, true)|trim + '【example_input_end】\n' -}}
                {# Example output: only keep the text of the first output content #}
                {%- set output_text = '' -%}
                {%- if example_output_part is string -%}
                    {%- set output_text = example_output_part -%}
                {%- elif example_output_part.text is defined -%}
                    {%- set output_text = example_output_part.text -%}
                {%- endif -%}
                {{- '【example_output_start】' + output_text|trim + '【example_output_end】\n' -}}
                {%- if loop.last and has_examples.flag -%}
                    {{- '【examples_end】\n' -}}
                {%- endif -%}
            {%- endif -%}
        {%- endif -%}
    {%- endfor -%}
    {# Previous Output Section #}
    {%- if previous_output -%}
        {{- '【previous_output_start】' + previous_output + '【previous_output_end】\n' -}}
    {%- endif -%}
{%- endif -%}
{{- '【document_start】\n' -}}
{# PROCESS PROVIDED USER MESSAGES (RENDERED INTO A SINGLE ONE) #}
{%- for message in messages -%}
    {%- if message.role == "system" %}
        {%- if not loop.first %}
            {{- raise_exception('System message must be at the beginning.') }}
        {%- endif %}
    {%- elif message.role == 'user' and message.name != "example" -%}
        {%- set content = render_content(message.content, true)|trim %}
        {{- content + '\n' -}}
    {# {%- elif message.role == 'assistant' and not loop.last %}
        llama.cpp renders a synthetic init example with an assistant turn in
        the middle; ignore it so valid NuExtract prompts render unchanged.
        {{- raise_exception('Assistant message must be at the end.') }} #}
    {%- endif %}
{%- endfor -%}
{{- '【document_end】<|im_end|>\n' -}}
{# ASSISTANT MESSAGE #}
{%- if messages[-1].role == 'assistant' %}
    {%- if add_generation_prompt -%}
        {{- raise_exception('`add_generation_prompt` can only be `True` when no assistant message is provided.') }}
    {%- endif %}
    {%- set content = render_content(messages[-1].content, true)|trim %}
    {%- set reasoning_content = '' %}
    {%- if messages[-1].reasoning_content is string %}
        {%- set reasoning_content = messages[-1].reasoning_content %}
    {%- else %}
        {%- if '</think>' in content %}
            {%- set reasoning_content = content.split('</think>')[0].rstrip('\n').split('<think>')[-1].lstrip('\n') %}
            {%- set content = content.split('</think>')[-1].lstrip('\n') %}
        {%- endif %}
    {%- endif %}
    {%- set reasoning_content = reasoning_content|trim %}
    {% generation %}
    {{- '<|im_start|>assistant\n<think>\n' + reasoning_content + '\n</think>\n\n' + content + '<|im_end|>\n' -}}
    {% endgeneration %}
{%- endif -%}
{# GENERATION PROMPT #}
{%- if add_generation_prompt -%}
    {{- '<|im_start|>assistant\n' -}}
    {%- if not enable_thinking -%}
        {{- '<think>\n\n</think>\n\n' -}}
    {%- else %}
        {{- '<think>\n' -}}
    {%- endif %}
{%- endif -%}