{#- Default system message if no system prompt is passed. #}
{%- set default_system_message = '# HOW YOU SHOULD THINK AND ANSWER\n\nFirst draft your thinking process (inner monologue) until you arrive at a response. Format your response using Markdown, and use LaTeX for any mathematical equations. Write both your thoughts and the response in the same language as the input.\n\nYour thinking process must follow the template below:[THINK]Your thoughts or/and draft, like working through an exercise on scratch paper. Be as casual and as long as you want until you are confident to generate the response to the user.[/THINK]Here, provide a self-contained response.' %}

{#- Begin of sequence token. #}
{{- bos_token }}

{#- Handle system prompt if it exists. #}
{#- System prompt supports text content or text and thinking chunks. #}
{%- if messages[0]['role'] == 'system' %}
    {{- '[SYSTEM_PROMPT]' -}}
    {%- if messages[0]['content'] is string %}
        {{- messages[0]['content'] -}}
    {%- else %}        
        {%- for block in messages[0]['content'] %}
            {%- if block['type'] == 'text' %}
                {{- block['text'] }}
            {%- elif block['type'] == 'thinking' %}
                {{- '[THINK]' + block['thinking'] + '[/THINK]' }}
            {%- else %}
                {{- raise_exception('Only text and thinking chunks are supported in system message contents.') }}
            {%- endif %}
        {%- endfor %}
    {%- endif %}
    {{- '[/SYSTEM_PROMPT]' -}}
    {%- set loop_messages = messages[1:] %}
{%- else %}
    {%- set loop_messages = messages %}
    {%- if default_system_message != '' %}
        {{- '[SYSTEM_PROMPT]' + default_system_message + '[/SYSTEM_PROMPT]' }}
    {%- endif %}
{%- endif %}


{#- Tools definition #}
{%- set tools_definition = '' %}
{%- set has_tools = false %}
{%- if tools is defined and tools is not none and tools|length > 0 %}
    {%- set has_tools = true %}
    {%- set tools_definition = '[AVAILABLE_TOOLS]' + (tools| tojson) + '[/AVAILABLE_TOOLS]' %}
    {{- tools_definition }}
{%- endif %}

{#- Checks for alternating user/assistant messages. #}
{%- set ns = namespace(index=0) %}
{%- for message in loop_messages %}
    {%- if message.role == 'user' or (message.role == 'assistant' and (message.tool_calls is not defined or message.tool_calls is none or message.tool_calls | length == 0)) %}
        {%- if (message['role'] == 'user') != (ns.index % 2 == 0) %}
            {{- raise_exception('After the optional system message, conversation roles must alternate user and assistant roles except for tool calls and results.') }}
        {%- endif %}
        {%- set ns.index = ns.index + 1 %}
    {%- endif %}
{%- endfor %}

{#- Handle conversation messages. #}
{%- for message in loop_messages %}

    {#- User messages supports text content or text and image chunks. #}
    {%- if message['role'] == 'user' %}
        {%- if message['content'] is string %}
            {{- '[INST]' + message['content'] + '[/INST]' }}
        {%- elif message['content'] | length > 0 %}
            {{- '[INST]' }}
            {%- if message['content'] | length == 2 %}
                {%- set blocks = message['content'] | sort(attribute='type') %}
            {%- else %}
                {%- set blocks = message['content'] %}
            {%- endif %}
            {%- for block in blocks %}
                {%- if block['type'] == 'text' %}
                    {{- block['text'] }}
                {%- elif block['type'] in ['image', 'image_url'] %}
                    {{- '[IMG]' }}
                {%- else %}
                    {{- raise_exception('Only text, image and image_url chunks are supported in user message content.') }}
                {%- endif %}
            {%- endfor %}
            {{- '[/INST]' }}
        {%- else %}
            {{- raise_exception('User message must have a string or a list of chunks in content') }}
        {%- endif %}

    {#- Assistant messages supports text content or text, image and thinking chunks. #}
    {%- elif message['role'] == 'assistant' %}
        {%- if (message['content'] is none or message['content'] == '' or message['content']|length == 0) and (message['tool_calls'] is not defined or message['tool_calls'] is none or message['tool_calls']|length == 0) %}
            {{- raise_exception('Assistant message must have a string or a list of chunks in content or a list of tool calls.') }}
        {%- endif %}

        {%- if message['content'] is string and message['content'] != '' %}
            {{- message['content'] }}
        {%- elif message['content'] | length > 0 %}
            {%- for block in message['content'] %}
                {%- if block['type'] == 'text' %}
                    {{- block['text'] }}
                {%- elif block['type'] == 'thinking' %}
                    {{- '[THINK]' + block['thinking'] + '[/THINK]' }}
                {%- else %}
                    {{- raise_exception('Only text and thinking chunks are supported in assistant message contents.') }}
                {%- endif %}
            {%- endfor %}
        {%- endif %}
        
        {%- if message['tool_calls'] is defined and message['tool_calls'] is not none and message['tool_calls']|length > 0 %}
            {%- for tool in message['tool_calls'] %}
                {{- '[TOOL_CALLS]' }}
                {%- set name = tool['function']['name'] %}
                {%- set arguments = tool['function']['arguments'] %}
                {%- if arguments is not string %}
                    {%- set arguments = arguments|tojson|safe %}
                {%- elif arguments == '' %}
                    {%- set arguments = '{}' %}
                {%- endif %}
                {{- name + '[ARGS]' + arguments }}
            {%- endfor %}
        {%- endif %}

        {{- eos_token }}

    {#- Tool messages only supports text content. #}
    {%- elif message['role'] == 'tool' %}
        {{- '[TOOL_RESULTS]' + message['content']|string + '[/TOOL_RESULTS]' }}

    {#- Raise exception for unsupported roles. #}
    {%- else %}
        {{- raise_exception('Only user, assistant and tool roles are supported, got ' + message['role'] + '.') }}
    {%- endif %}
{%- endfor %}
