{#- 0826版本 -#}
{%- if not messages %}
    {{- raise_exception('No messages provided.') }}
{%- endif %}
{%- set enable_thinking = enable_thinking | default(true) %}

{#- Render a string or a list of text blocks. -#}
{%- macro render_content(content, context_name) %}
    {%- if content is string %}
        {{- content }}
    {%- elif content is none or content is undefined %}
        {{- '' }}
    {%- elif content is iterable and content is not mapping %}
        {%- for block in content %}
            {%- if block.type == 'text' %}
                {{- block.text }}
            {%- else %}
                {{- raise_exception('Unsupported ' ~ context_name ~ ' content block type: ' ~ (block.type | string)) }}
            {%- endif %}
        {%- endfor %}
    {%- else %}
        {{- raise_exception(context_name ~ ' content must be a string or a list of text blocks') }}
    {%- endif %}
{%- endmacro %}

{#- Default system prompt -#}
{%- set default_system = "you are a helpful assistant." %}

{#- The first message-level system is placed in the initial system block. -#}
{%- set ns = namespace(initial_system='') %}
{%- if messages[0].role == "system" %}
    {%- set ns.initial_system = render_content(messages[0].content, 'system') %}
{%- endif %}

{#- System block -#}
{{- '<｜start▁of▁sentence｜><|System|>' + '\n' + default_system }}
{%- if tools %}
    {{- '## Tools' + '\n' + 'You have access to the following functions:' + '\n' + '<tools>' }}
    {%- for tool in tools %}
        {{- '\n' + tool.function | tojson}}
    {%- endfor %}
    {{- '\n' + '</tools>' }}
{%- endif %}
{%- if ns.initial_system %}
    {{- '\n\n' + ns.initial_system }}
{%- endif %}
{{- '<｜end▁of▁sentence｜>'}}

{#- Conversation turns -#}
{%- for message in messages %}
    {%- if message.role == "system" %}
        {#- The first system message was consumed by the initial block. -#}
        {%- if not loop.first %}
            {{- '<｜start▁of▁sentence｜><|System|>\n' + render_content(message.content, 'system') + '<｜end▁of▁sentence｜>' }}
        {%- endif %}
    {%- elif message.role == "user" %}
        {{- '<｜start▁of▁sentence｜><|User|>' + render_content(message.content, 'user') + '<｜end▁of▁sentence｜>' }}
    {%- elif message.role == "assistant" %}
        {%- set assistant_content = render_content(message.content, 'assistant') %}
        {%- if message.reasoning_content is defined and message.reasoning_content %}
            {%- set reasoning_content = message.reasoning_content %}
        {%- else %}
            {%- set reasoning_content = '' %}
        {%- endif %}
        {{- '<｜start▁of▁sentence｜><|Bot|>'}}
        {%- if reasoning_content %}
            {{- '<think>' + reasoning_content + '</think>'}}
        {%- else %}
            {{- '</think>' }}
        {%- endif %}
        {%- if assistant_content %}
            {{- assistant_content }}
        {%- endif %}
        {%- if message.tool_calls is defined and message.tool_calls is not none %}
            {%- for tool_call in message.tool_calls %}
                {%- if tool_call.function.arguments is not mapping %}
                    {{- raise_exception('tool_call.function.arguments must be a dictionary; normalize JSON strings before apply_chat_template') }}
                {%- endif %}
                {%- set args = tool_call.function.arguments %}
                {{- '<tool_call>' + tool_call.function.name }}
                {%- for k, v in args.items() %}
                    {{- '<arg_key>' ~ k ~ '</arg_key><arg_value>' ~ (v if v is string else v | tojson) ~ '</arg_value>' }}
                {%- endfor %}
                {{- '</tool_call>' }}
            {%- endfor %}
        {%- endif %}
        {{- '<｜end▁of▁sentence｜>' }}
    {%- elif message.role == "tool" %}
        {%- if loop.previtem is undefined or loop.previtem.role != "tool" %}
            {{- '<｜start▁of▁sentence｜><|Tool|>' }}
        {%- endif %}
        {{- '<tool_response>' ~ message.content ~ '</tool_response>' }}
        {%- if loop.nextitem is undefined or loop.nextitem.role != "tool" %}
            {{- '<｜end▁of▁sentence｜>' }}
        {%- endif %}
    {%- else %}
        {{- raise_exception('Unsupported message role: ' ~ message.role) }}
    {%- endif %}
{%- endfor %}

{#- Generation prompt -#}
{%- if add_generation_prompt %}
    {{- '<｜start▁of▁sentence｜><|Bot|>' }}
    {%- if enable_thinking is defined and enable_thinking %}
        {{- '<think>' }}
    {%- endif %}
    {%- if enable_thinking is defined and not enable_thinking %}
        {{- '</think>' }}
    {%- endif %}
{%- endif %}