{% macro render_item_list(item_list, tag_name='required') %}
    {%- if item_list is defined and item_list is iterable and item_list | length > 0 %}
        {%- if tag_name %}{{- '\n<' ~ tag_name ~ '>' -}}{% endif %}
            {{- '[' }}
                {%- for item in item_list -%}
                    {%- if loop.index > 1 %}{{- ", "}}{% endif -%}
                    {%- if item is string -%}
                        {{ "`" ~ item ~ "`" }}
                    {%- else -%}
                        {{ item }}
                    {%- endif -%}
                {%- endfor -%}
            {{- ']' }}
        {%- if tag_name %}{{- '</' ~ tag_name ~ '>' -}}{% endif %}
    {%- endif %}
{% endmacro %}

{%- if not add_generation_prompt is defined %}
    {% set add_generation_prompt = false %}
{%- endif %}

{%- set ns = namespace(is_first=false, system_prompt='You are Nex, a helpful assistant.', is_first_sp=true, is_last_user=false) %}
{%- for message in messages %}
    {%- if message['role'] == 'system' %}
        {%- if ns.is_first_sp %}
            {% set ns.system_prompt = message['content'] %}
            {% set ns.is_first_sp = false %}
        {%- else %}
            {% set ns.system_prompt = ns.system_prompt ~ '\n\n' ~ message['content'] %}
        {%- endif %}
    {%- endif %}
{%- endfor -%}

{%- if tools is defined and tools is not none %}
    {% set tool_ns = namespace(text='You are a helpful assistant with tool calling capabilities. '
        'When a tool call is needed, you MUST use the following format to issue the call:\n\n'
        '<tool_call>\n<function=example_function_name>\n<parameter=example_parameter_1>\nvalue_1\n</parameter>\n<parameter=example_parameter_2>\nThis is the value for the second parameter\nthat can span\nmultiple lines\n</parameter>\n</function>\n</tool_call>\n\n'
        'IMPORTANT:\n'
        '- Function calls MUST follow the specified format: an inner <function=...></function> block must be nested within <tool_call></tool_call> XML tags\n'
        '- Required parameters MUST be specified\n'
        '- You may provide optional reasoning for your function call in natural language BEFORE the function call, but NOT after\n\n'
        'You have access to the following functions:\n\n'
        '<tools>') %}
    {% for tool in tools %}
        {%- if tool.function is defined %}
            {%- set tool = tool.function %}
        {%- endif %}
        {% set tool_ns.text = tool_ns.text ~ '\n<function>\n<name>' ~ tool.name ~ '</name>' %}
        {% set tool_ns.text = tool_ns.text ~ '\n<description>' ~ (tool.description | trim) ~ '</description>' %}
        {% set tool_ns.text = tool_ns.text ~ '\n<parameters>' %}
        {%- for param_name, param_fields in tool.parameters.properties|items %}
            {% set tool_ns.text = tool_ns.text ~ '\n<parameter>' %}
            {% set tool_ns.text = tool_ns.text ~ '\n<name>' ~ param_name ~ '</name>' %}
            {%- if param_fields.type is defined %}
                {% set tool_ns.text = tool_ns.text ~ '\n<type>' ~ (param_fields.type | string) ~ '</type>' %}
            {%- endif %}
            {%- if param_fields.description is defined %}
                {% set tool_ns.text = tool_ns.text ~ '\n<description>' ~ (param_fields.description | trim) ~ '</description>' %}
            {%- endif %}
            {%- if param_fields.enum is defined and param_fields.enum is iterable and param_fields.enum | length > 0 %}
                {% set tool_ns.text = tool_ns.text ~ render_item_list(param_fields.enum, 'enum') %}
            {%- endif %}
            {%- set handled_keys = ['type', 'description', 'enum', 'required'] %}
            {%- for json_key in param_fields.keys() | reject("in", handled_keys) %}
                {%- set normed_json_key = json_key | replace("-", "_") | replace(" ", "_") | replace("$", "") %}
                {%- if param_fields[json_key] is mapping %}
                    {% set tool_ns.text = tool_ns.text ~ '\n<' ~ normed_json_key ~ '>' ~ (param_fields[json_key] | tojson | safe) ~ '</' ~ normed_json_key ~ '>' %}
                {%- else %}
                    {% set tool_ns.text = tool_ns.text ~ '\n<' ~ normed_json_key ~ '>' ~ (param_fields[json_key] | string) ~ '</' ~ normed_json_key ~ '>' %}
                {%- endif %}
            {%- endfor %}
            {%- if param_fields.required is defined and param_fields.required is iterable and param_fields.required | length > 0 %}
                {% set tool_ns.text = tool_ns.text ~ render_item_list(param_fields.required, 'required') %}
            {%- endif %}
            {% set tool_ns.text = tool_ns.text ~ '\n</parameter>' %}
        {%- endfor %}
        {%- if tool.parameters.required is defined and tool.parameters.required is iterable and tool.parameters.required | length > 0 %}
            {% set tool_ns.text = tool_ns.text ~ render_item_list(tool.parameters.required, 'required') %}
        {%- endif %}
        {% set tool_ns.text = tool_ns.text ~ '\n</parameters>' %}
        {%- if tool.return is defined %}
            {%- if tool.return is mapping %}
                {% set tool_ns.text = tool_ns.text ~ '\n<return>' ~ (tool.return | tojson | safe) ~ '</return>' %}
            {%- else %}
                {% set tool_ns.text = tool_ns.text ~ '\n<return>' ~ (tool.return | string) ~ '</return>' %}
            {%- endif %}
        {%- endif %}
        {% set tool_ns.text = tool_ns.text ~ '\n</function>' %}
    {% endfor %}
    {% set tool_ns.text = tool_ns.text ~ '\n</tools>' %}
    {% set ns.system_prompt = ns.system_prompt ~ '\n\n' ~ tool_ns.text %}
{%- endif %}

{%- if ns.system_prompt %}
    {{- '<|im_start|>system\n' ~ ns.system_prompt ~ '<|im_end|>\n' }}
{%- endif %}

{%- for message in messages %}
    {% set content = message['content'] %}
    {%- if content is none %}
        {% set content = '' %}
    {%- endif %}
    {%- if message['role'] == 'user' %}
        {%- set ns.is_first = false -%}
        {%- set ns.is_last_user = true -%}
        {{- '<|im_start|>user\n' ~ content ~ '<|im_end|>\n' }}
    {%- endif %}
    {%- if message['role'] == 'assistant' %}
        {% if '</think>' in content %}
            {% set content = content.split('</think>')[-1] %}
        {% endif %}
    {% endif %}
    {%- if message['role'] == 'assistant' and message['tool_calls'] is defined and message['tool_calls'] is not none %}
        {%- set ns.is_last_user = false -%}
        {%- set ns.is_first = false %}
        {{- '<|im_start|>assistant' }}
        {%- if content is defined and content is not none and content | trim | length > 0 %}
            {{- '\n' + content | trim + '\n' }}
        {%- endif %}
        {%- for tool in message['tool_calls'] %}
            {%- if tool.function is defined %}
                {%- set tool_call = tool.function %}
            {%- else %}
                {%- set tool_call = tool %}
            {%- endif %}
            {{- '\n<tool_call>\n<function=' ~ tool_call.name ~ '>\n' }}
            {%- if tool_call.arguments is defined %}
                {%- for args_name, args_value in tool_call.arguments|items %}
                    {{- '<parameter=' ~ args_name ~ '>\n' }}
                    {%- set args_value = args_value if args_value is string else args_value | string %}
                    {{- args_value }}
                    {{- '\n</parameter>\n' }}
                {%- endfor %}
            {%- endif %}
            {{- '</function>\n</tool_call>' }}
        {%- endfor %}
        {{- '<|im_end|>\n'}}
    {%- endif %}
    {%- if message['role'] == 'assistant' and (message['tool_calls'] is not defined or message['tool_calls'] is none)%}
        {%- set ns.is_last_user = false -%}
        {{- '<|im_start|>assistant\n' ~ content ~ '<|im_end|>\n'}}
    {%- endif %}
    {%- if message['role'] == 'tool' %}
        {%- set ns.is_last_user = false -%}
        {%- if loop.previtem and loop.previtem['role'] != 'tool' %}
            {{- '<|im_start|>user\n' }}
        {%- endif %}
        {{- '<tool_response>\n' }}
        {{- content }}
        {{- '\n</tool_response>\n' }}
        {%- if not loop.last and loop.nextitem['role'] != 'tool' %}
            {{- '<|im_end|>\n' }}
        {%- elif loop.last %}
            {{- '<|im_end|>\n' }}
        {%- endif %}
    {%- endif %}
{%- endfor -%}
{% if add_generation_prompt %}
    {{- '<|im_start|>assistant\n'}}
{%- endif %}