LLeMbas/src/lembas/web/templates/chat/_message.html

{% from "_macros.html" import icon, mark, model_avatar %}
{% set speaking_model = (models_by_id | default({})).get(message.model_id) %}
{#
  One message bubble, in either of two states.

  An incomplete assistant message renders the streaming shell: it carries the
  sse-connect that opens the reply stream. This is deliberately the ONLY thing
  that starts a generation, which means a page load showing an unfinished reply
  picks it up again -- reloading after a dropped connection retries rather than
  leaving a permanently half-written answer.

  A complete message renders its finished body: Markdown for the assistant,
  escaped plain text for everyone else.
#}
{% set streaming = (message.role == "assistant" and not message.complete) %}

<article class="msg msg--{{ message.role }}" id="msg-{{ message.id }}"
  {% if streaming %}
         hx-ext="sse"
         sse-connect="/api/chats/{{ chat.id }}/messages/{{ message.id }}/stream"
         sse-close="close"
  {% endif %}>

  <div class="msg__gutter" aria-hidden="true">
    {% if message.role == "assistant" %}
      {# The model that actually wrote this turn, which is not necessarily the
         one the chat is set to now. Falls back to the LLeMbas mark when the
         model has been removed or has no image of its own. #}
      {% if speaking_model %}
        {{ model_avatar(speaking_model, cls="msg__avatar") }}
      {% else %}
        {{ mark(cls="msg__mark", uid="m" ~ message.id) }}
      {% endif %}
    {% else %}
      <span class="msg__initial">{{ (user.name or "?")[0]|upper }}</span>
    {% endif %}
  </div>

  <div class="msg__main">
    <header class="msg__meta">
      <span class="msg__author">
        {% if message.role == "assistant" %}
          {{ speaking_model.label if speaking_model else "LLeMbas" }}
        {% else %}
          {{ user.name or "You" }}
        {% endif %}
      </span>
      {% if message.model_id and (not speaking_model or speaking_model.display_name) %}
      {# Only worth showing when it adds something the author line does not. #}
      <span class="msg__model" title="{{ message.model_id }}">{{ message.model_id }}</span>
      {% endif %}
    </header>

    {% if message.attachments %}
    {# Above the text, matching the order they were added and the order the
       model receives them. #}
    <div class="attachments">
      {% for attachment in message.attachments %}
        {% if attachment.is_image %}
        <a class="attachments__image" href="/api/files/{{ attachment.id }}/content"
           target="_blank" rel="noopener">
          <img src="/api/files/{{ attachment.id }}/content" alt="{{ attachment.filename }}"
               loading="lazy" width="{{ attachment.width }}" height="{{ attachment.height }}">
        </a>
        {% else %}
        <div class="attachments__doc">
          {{ icon("attach", "icon--sm") }}
          <span class="attachments__doc-body">
            <a href="/api/files/{{ attachment.id }}/content">{{ attachment.filename }}</a>
            <span class="chip__meta">
              {{ attachment.human_size }}
              {%- if attachment.pages %} · {{ attachment.pages }} page{{ '' if attachment.pages == 1 else 's' }}{% endif %}
              {%- if attachment.truncated %} · truncated{% endif %}
              {%- if attachment.extracted_text %}
              · <a href="/api/files/{{ attachment.id }}/text" target="_blank"
                   rel="noopener">view extracted text</a>
              {%- endif %}
            </span>
            {% if attachment.extraction_error %}
            <span class="chip__warning">{{ attachment.extraction_error }}</span>
            {% endif %}
          </span>
        </div>
        {% endif %}
      {% endfor %}
    </div>
    {% endif %}

    {% if streaming %}
      {# Reasoning arrives before the answer, so this block sits above it.
         Closed by default -- the answer is what the reader is waiting for, and
         the thinking is one click away. The :has() rule in chat.css hides the
         whole thing while it is still empty, so models that emit no reasoning
         never show an empty box. #}
      <details class="reasoning reasoning--live" id="reasoning-{{ message.id }}">
        <summary class="reasoning__summary">
          {{ icon("sparkle", "icon--sm reasoning__icon") }}
          <span class="reasoning__label">Thinking…</span>
          {{ icon("chevron-down", "icon--sm reasoning__chevron") }}
        </summary>
        {# innerHTML, not beforeend: the frame carries the whole block of
           thinking each time, exactly as `render` and `tools` do. Appending it
           repeated everything already shown, so the panel grew quadratically. #}
        <div class="reasoning__body" sse-swap="reasoning" hx-swap="innerHTML"></div>
      </details>

      {# Tool activity as it happens. Empty until the model asks for something,
         and the whole block is replaced each time rather than appended to --
         a follower attaching late has no earlier fragments to build on. #}
      <div class="tool-activity-list" id="tools-{{ message.id }}"
           sse-swap="tools" hx-swap="innerHTML"></div>

      {# The server re-renders the answer as Markdown a few times a second and
         replaces this whole block, so formatting appears as the model writes
         rather than snapping into place at the end. #}
      <div class="msg__body msg__body--live" id="stream-{{ message.id }}"
           sse-swap="render" hx-swap="innerHTML"></div>
      {# No stop button here: the composer's send button becomes Stop while a
         reply is being written, which is where the hand already is. #}
      <div class="msg__waiting">
        <span class="dots"><i></i><i></i><i></i></span>
      </div>
      {# Counts as the reply is written. Everything is an estimate until the
         usage chunk lands at the very end, and the chips say so. #}
      <div class="msg__metrics" id="metrics-{{ message.id }}"
           sse-swap="metrics" hx-swap="innerHTML"></div>
    {% else %}
      {# Finished. Same order as the live view above -- thinking, then what it
         looked up, then the answer -- so a reply does not rearrange itself the
         moment it stops streaming. #}
      {% if message.reasoning and not message.error %}
      {# Collapsed once finished: the answer is what the reader came for, and
         the thinking is there if they want to audit it. #}
      <details class="reasoning" id="reasoning-{{ message.id }}">
        <summary class="reasoning__summary">
          {{ icon("sparkle", "icon--sm reasoning__icon") }}
          <span class="reasoning__label">
            {% if message.reasoning_ms %}
              Thought for {{ message.reasoning_ms | duration }}
            {% else %}
              Reasoning
            {% endif %}
          </span>
          {{ icon("chevron-down", "icon--sm reasoning__chevron") }}
        </summary>
        <div class="reasoning__body">{{ message.reasoning }}</div>
      </details>
      {% endif %}

      {% if message.tool_calls_json %}
      {# Kept with the message rather than discarded with the stream, so the
         sources behind an answer are still there tomorrow. #}
      <div class="tool-activity-list">
        {% with tool_events = message.tool_calls_json, live = false %}
          {% include "chat/_tool_activity.html" %}
        {% endwith %}
      </div>
      {% endif %}

      {% if message.error %}
      <div class="alert alert--error msg__error" role="alert">
        {{ icon("warning", "alert__icon") }}
        <div>
          <strong>The reply could not be completed.</strong>
          <div class="text-sm" style="margin-top: var(--sp-1)">{{ message.error }}</div>
        </div>
      </div>
      {% endif %}

      {% if message.role == "assistant" %}
        {% if message.content %}
        <div class="msg__body">{{ body_html|safe }}</div>
        {% endif %}
        {% if message.stopped %}
        <p class="msg__note">{{ icon("x", "icon--sm") }} Stopped. This reply is cut short.</p>
        {% endif %}
      {% elif message.content %}
        <div class="msg__body msg__body--plain">{{ message.content }}</div>
      {% endif %}
      {# An attachment-only turn has no text; rendering the bubble anyway would
         leave an empty box under the file. #}
    {% endif %}

    {% if not streaming and message.role == "assistant" and message.usage_json %}
    {# Above the buttons, not among them: the actions row is things you press. #}
    <div class="msg__metrics" id="metrics-{{ message.id }}">
      {% with metrics = message.usage_json | metrics %}
        {% include "chat/_metrics.html" %}
      {% endwith %}
    </div>
    {% endif %}

    {% if not streaming %}
    <footer class="msg__actions">
      <button class="btn btn--icon btn--sm" type="button"
              data-copy="msg-body-{{ message.id }}" aria-label="Copy message">
        {{ icon("copy", "icon--sm") }}
      </button>
      {% if message.role == "user" %}
      <button class="btn btn--icon btn--sm" type="button"
              hx-get="/api/chats/{{ chat.id }}/messages/{{ message.id }}/edit"
              hx-target="#msg-{{ message.id }}" hx-swap="outerHTML"
              aria-label="Edit and retry from here">
        {{ icon("pencil", "icon--sm") }}
      </button>
      {% endif %}
      {% if message.role == "assistant" %}
      <button class="btn btn--icon btn--sm" type="button"
              hx-post="/api/chats/{{ chat.id }}/messages/{{ message.id }}/regenerate"
              hx-target="#msg-{{ message.id }}" hx-swap="outerHTML"
              aria-label="Regenerate reply">
        {{ icon("refresh", "icon--sm") }}
      </button>
      {% if can_listen | default(false) and message.content and not message.error %}
      {# Speech is synthesised on demand rather than stored: the voice can
         change under the reader between plays, and a reply can be regenerated
         at the same address. #}
      {# data-speak-auto is set only on the frame that ends a live stream, never
         on a page load: reopening a chat must not start reading its last reply
         out loud again. #}
      <button class="btn btn--icon btn--sm" type="button"
              data-speak="/api/audio/speech/{{ chat.id }}/{{ message.id }}"
              {% if audio_autoplay | default(false) and just_finished | default(false) %}data-speak-auto{% endif %}
              aria-label="Read this reply aloud">
        <span class="speak__icon speak__icon--play">{{ icon("speaker", "icon--sm") }}</span>
        <span class="speak__icon speak__icon--stop">{{ icon("stop-circle", "icon--sm") }}</span>
      </button>
      {% endif %}
      {% endif %}
    </footer>
    {# The raw source, so the copy button yields Markdown rather than rendered
       text. A hidden div and not a <script>: script content is raw text, so
       the escaping Jinja applies would be copied out literally as entities. #}
    <div hidden id="msg-body-{{ message.id }}">{{ message.content }}</div>
    {% endif %}
  </div>

  {% if streaming %}
  {# Receives the finished bubble and replaces this whole article with it. #}
  <div hidden sse-swap="done" hx-target="#msg-{{ message.id }}" hx-swap="outerHTML"></div>
  {% endif %}
</article>