{# ───── defaults ───── #}
{%- if enable_thinking is not defined -%}
{%- set enable_thinking = true -%}
{%- endif -%}

{# ───── reasoning mode ───── #}
{%- if enable_thinking -%}
  {%- set reasoning_mode = "/think" -%}
{%- else -%}
  {%- set reasoning_mode = "/no_think" -%}
{%- endif -%}

{# ───── header (system message) ───── #}
{{- "<|im_start|>system\n" -}}

{%- if messages[0].role == "system" -%}
  {%- set system_message = messages[0].content -%}
  {%- if "/no_think" in system_message -%}
    {%- set reasoning_mode = "/no_think" -%}
  {%- elif "/think" in system_message -%}
    {%- set reasoning_mode = "/think" -%}
  {%- endif -%}
  {%- set custom_instructions = system_message.replace("/no_think", "").replace("/think", "").rstrip() -%}
{%- endif -%}

{%- if "/system_override" in system_message -%}
  {{- custom_instructions.replace("/system_override", "").rstrip() -}}
{%- else -%}
  {{- "## Metadata\n\n" -}}
  {{- "Knowledge Cutoff Date: June 2025\n" -}}
  {%- set today = strftime_now("%d %B %Y") -%}
  {{- "Today Date: " ~ today ~ "\n" -}}
  {{- "Reasoning Mode: " + reasoning_mode + "\n\n" -}}

  {{- "## Custom Instructions\n\n" -}}
  {%- if custom_instructions -%}
    {{- custom_instructions + "\n\n" -}}
  {%- elif reasoning_mode == "/think" -%}
    {{- "You are a helpful AI assistant named SmolLM, trained by Hugging Face.\n\n" -}}
  {%- else -%}
    {{- "You are a helpful AI assistant named SmolLM, trained by Hugging Face.\n\n" -}}
  {%- endif -%}

  {%- if xml_tools or python_tools or tools -%}
    {{- "### Tools\n\n" -}}
    {%- if xml_tools or tools -%}
      {%- if tools -%}
        {%- set xml_tools = tools -%}
      {%- endif -%}
      {%- set ns = namespace(xml_tool_string="You may call one or more functions to assist with the user query.\nYou are provided with function signatures within <tools></tools> XML tags:\n\n<tools>\n") -%}
      {%- for tool in xml_tools[:] -%}
        {%- set ns.xml_tool_string = ns.xml_tool_string ~ (tool | tojson) ~ "\n" -%}
      {%- endfor -%}
      {%- set xml_tool_string = ns.xml_tool_string + "</tools>\n\nFor each function call, return a json object with function name and arguments within <tool_call> XML tags:\n<tool_call>\n{\"name\": <function-name>, \"arguments\": <args-json-object>}\n</tool_call>" -%}
      {{- xml_tool_string -}}
    {%- endif -%}
    {%- if python_tools -%}
      {%- set ns = namespace(python_tool_string="You may call one or more functions as python tools.\n<tools>\n") -%}
      {%- for tool in python_tools[:] -%}
        {%- set ns.python_tool_string = ns.python_tool_string ~ (tool | string) ~ "\n" -%}
      {%- endfor -%}
      {%- set python_tool_string = ns.python_tool_string + "</tools>\n\nThe state persists between code executions." -%}
      {{- python_tool_string -}}
    {%- endif -%}
    {{- "\n\n" -}}
  {%- endif -%}
{%- endif -%}
{{- "<|im_end|>\n" -}}

{# ───── main loop ───── #}
{%- for message in messages -%}
    {%- if message.role == "user" -%}
        {{ "<|im_start|>user\n" + message.content + "<|im_end|>\n" }}
    {%- elif message.role == "assistant" -%}
        {% generation %}
        {%- if message.tool_calls -%}
            {%- set ns = namespace(tc_text="") -%}
            {%- for tc in message.tool_calls -%}
                {%- set ns.tc_text = ns.tc_text ~ "<tool_call>\n{\"name\": \"" ~ tc.function.name ~ "\", \"arguments\": " ~ tc.function.arguments ~ "}\n</tool_call>" -%}
            {%- endfor -%}
            {{ "<|im_start|>assistant\n" ~ (message.content if message.content is string else "") ~ ns.tc_text ~ "<|im_end|>\n" }}
        {%- else -%}
            {%- if reasoning_mode == "/think" -%}
                {{ "<|im_start|>assistant\n<think>\n" ~ (message.content if message.content is string else "") ~ "\n</think><|im_end|>\n" }}
            {%- else -%}
                {{ "<|im_start|>assistant\n" ~ (message.content if message.content is string else "") ~ "<|im_end|>\n" }}
            {%- endif -%}
        {%- endif -%}
        {% endgeneration %}
    {%- elif message.role == "tool" -%}
        {{ "<|im_start|>user\n<tool_response>\n" ~ (message.content if message.content is string else "") ~ "\n</tool_response><|im_end|>\n" }}
    {%- endif -%}
{%- endfor -%}

{# ───── generation prompt ───── #}
{%- if add_generation_prompt -%}
    {%- if reasoning_mode == "/think" -%}
        {{ "<|im_start|>assistant\n<think>\n" }}
    {%- else -%}
        {{ "<|im_start|>assistant\n" }}
    {%- endif -%}
{%- endif -%}