Hermes-ui/src/components/chat/MessageList.vue

<script setup lang="ts">
import { ref, computed, watch, nextTick } from 'vue'
import { useI18n } from 'vue-i18n'
import MessageItem from './MessageItem.vue'
import { useChatStore } from '@/stores/chat'
import thinkingVideo from '@/assets/thinking.mp4'

const chatStore = useChatStore()
const { t } = useI18n()
const listRef = ref<HTMLElement>()

const displayMessages = computed(() =>
  chatStore.messages.filter(m => m.role !== 'tool'),
)

const currentToolCalls = computed(() => {
  const msgs = chatStore.messages
  // Find the last user message index
  let lastUserIdx = -1
  for (let i = msgs.length - 1; i >= 0; i--) {
    if (msgs[i].role === 'user') { lastUserIdx = i; break }
  }
  // Only tool calls after the last user message, newest on top
  const tools = msgs.filter((m, i) => m.role === 'tool' && i > lastUserIdx)
  return [...tools].reverse()
})

function scrollToBottom() {
  nextTick(() => {
    if (listRef.value) {
      listRef.value.scrollTop = listRef.value.scrollHeight
    }
  })
}

watch(() => chatStore.messages.length, scrollToBottom)
watch(() => chatStore.messages[chatStore.messages.length - 1]?.content, scrollToBottom)
watch(() => chatStore.isStreaming, (v) => { if (v) scrollToBottom() })
watch(currentToolCalls, scrollToBottom)
</script>

<template>
  <div ref="listRef" class="message-list">
    <div v-if="chatStore.messages.length === 0" class="empty-state">
      <img src="/assets/logo.png" alt="Hermes" class="empty-logo" />
      <p>{{ t('chat.emptyState') }}</p>
    </div>
    <MessageItem
      v-for="msg in displayMessages"
      :key="msg.id"
      :message="msg"
    />
    <Transition name="fade">
      <div v-if="chatStore.isStreaming" class="streaming-indicator">
        <video :src="thinkingVideo" autoplay loop muted playsinline class="thinking-video" />
        <div v-if="currentToolCalls.length > 0" class="tool-calls-panel">
          <div
            v-for="tc in currentToolCalls"
            :key="tc.id"
            class="tool-call-item"
          >
            <svg
              width="12"
              height="12"
              viewBox="0 0 24 24"
              fill="none"
              stroke="currentColor"
              stroke-width="1.5"
              class="tool-call-icon"
            >
              <path d="M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z" />
            </svg>
            <span class="tool-call-name">{{ tc.toolName }}</span>
            <span v-if="tc.toolPreview" class="tool-call-preview">{{ tc.toolPreview }}</span>
            <span v-if="tc.toolStatus === 'running'" class="tool-call-spinner"></span>
            <span v-if="tc.toolStatus === 'error'" class="tool-call-error">{{ t('chat.error') }}</span>
          </div>
        </div>
      </div>
    </Transition>
  </div>
</template>

<style scoped lang="scss">
@use '@/styles/variables' as *;

.message-list {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background-color: #ffffff;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: $text-muted;
  gap: 12px;

  .empty-logo {
    width: 48px;
    height: 48px;
    opacity: 0.25;
  }

  p {
    font-size: 14px;
  }
}

.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.4s ease;
}
.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}

.streaming-indicator {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 4px;

  .thinking-video {
    width: 120px;
    height: 120px;
    border-radius: $radius-md;
    object-fit: contain;
    flex-shrink: 0;
  }
}

.tool-calls-panel {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 120px;
  overflow-y: auto;
  padding-top: 4px;
  scrollbar-width: none;
  -ms-overflow-style: none;
  &::-webkit-scrollbar { display: none; }
}

.tool-call-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: $text-secondary;
  padding: 3px 8px;
  background: rgba(0, 0, 0, 0.03);
  border-radius: $radius-sm;

  .tool-call-icon {
    flex-shrink: 0;
    color: $text-muted;
  }

  .tool-call-name {
    font-family: $font-code;
    flex-shrink: 0;
  }

  .tool-call-preview {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 300px;
    color: $text-muted;
  }
}

.tool-call-spinner {
  width: 10px;
  height: 10px;
  border: 1.5px solid $text-muted;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  flex-shrink: 0;
}

.tool-call-error {
  font-size: 9px;
  color: $error;
  background: rgba($error, 0.08);
  padding: 0 4px;
  border-radius: 3px;
  line-height: 14px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}
</style>