feat(ui,api): chat view with live tail and autoscroll, conversation rail with last message previews

2026-08-29 00:18:08 +02:00
parent 8ea4cea3ef
commit 3ca5843868
9 changed files with 532 additions and 334 deletions
@@ -0,0 +1,200 @@
+<script lang="ts">
+  import { tick } from "svelte";
+  import type { ApiClient } from "$lib/api/client";
+  import type { ContentBlock, HistoryMessage } from "$lib/api/types";
+  import EmptyState from "$lib/components/empty-state.svelte";
+  import ErrorNote from "$lib/components/error-note.svelte";
+  import { Skeleton } from "$lib/components/ui/skeleton";
+  import { Switch } from "$lib/components/ui/switch";
+  import { clip } from "$lib/format";
+  import { cn } from "$lib/utils";
+  import type { ActivityModel } from "./activity.svelte";
+  import { summarizeInput, toolLabel } from "./activity.svelte";
+  import QuestionCard from "./question-card.svelte";
+  import TurnCard from "./turn-card.svelte";
+
+  let {
+    client,
+    conversationId,
+    model,
+    refreshKey = 0,
+  }: {
+    client: ApiClient;
+    conversationId: string;
+    model: ActivityModel;
+    refreshKey?: number;
+  } = $props();
+
+  const RESULT_CLIP = 600;
+  const NEAR_BOTTOM_PX = 120;
+  const TICK_MS = 1000;
+
+  let messages = $state<HistoryMessage[] | null>(null);
+  let failure = $state<string | null>(null);
+  let showResults = $state(false);
+  let loadedAt = $state(new Date(0).toISOString());
+  let scroller = $state<HTMLDivElement | null>(null);
+  let now = $state(Date.now());
+  let pinned = true;
+
+  const tail = $derived(
+    model.turns
+      .filter((turn) => turn.status === "running" || turn.startedAt > loadedAt)
+      .reverse()
+  );
+  const tailSize = $derived(
+    tail.reduce(
+      (n, turn) => n + turn.text.length + Object.keys(turn.nodes).length,
+      0
+    )
+  );
+
+  async function load() {
+    failure = null;
+    try {
+      ({ messages } = await client.history(conversationId));
+      loadedAt = new Date().toISOString();
+    } catch (cause) {
+      failure = cause instanceof Error ? cause.message : String(cause);
+    }
+  }
+
+  function nearBottom(): boolean {
+    if (!scroller) {
+      return true;
+    }
+    const left =
+      scroller.scrollHeight - scroller.scrollTop - scroller.clientHeight;
+    return left < NEAR_BOTTOM_PX;
+  }
+
+  async function scrollToBottom() {
+    await tick();
+    if (scroller) {
+      scroller.scrollTop = scroller.scrollHeight;
+    }
+  }
+
+  $effect(() => {
+    if (refreshKey >= 0) {
+      pinned = true;
+      load();
+    }
+  });
+
+  $effect(() => {
+    const count = (messages?.length ?? 0) + tailSize;
+    if (pinned && count >= 0) {
+      scrollToBottom();
+    }
+  });
+
+  $effect(() => {
+    const timer = setInterval(() => {
+      if (model.running) {
+        now = Date.now();
+      }
+    }, TICK_MS);
+    return () => clearInterval(timer);
+  });
+
+  function blocks(message: HistoryMessage): ContentBlock[] {
+    return typeof message.content === "string"
+      ? [{ text: message.content, type: "text" }]
+      : message.content;
+  }
+
+  function resultText(block: ContentBlock): string {
+    const { content } = block;
+    if (typeof content === "string") {
+      return content;
+    }
+    if (Array.isArray(content)) {
+      return content
+        .map((part) =>
+          part && typeof part === "object" && "text" in part
+            ? String((part as { text: unknown }).text)
+            : ""
+        )
+        .join("\n");
+    }
+    return "";
+  }
+</script>
+
+<div
+  class="flex min-h-0 flex-1 flex-col gap-3 overflow-y-auto px-4 py-3 sm:px-6"
+  onscroll={() => {
+    pinned = nearBottom();
+  }}
+  bind:this={scroller}
+>
+  <span class="flex items-center gap-2 self-end text-muted-foreground text-xs">
+    <Switch aria-label="Show tool results" bind:checked={showResults} />
+    show tool results
+  </span>
+  {#if failure}
+    <ErrorNote message={failure} retry={load} />
+  {:else if messages === null}
+    <div class="flex flex-col gap-2">
+      <Skeleton class="h-10 w-2/3" />
+      <Skeleton class="h-16 w-full" />
+      <Skeleton class="h-10 w-1/2" />
+    </div>
+  {:else if messages.length === 0 && tail.length === 0}
+    <EmptyState
+      hint="Nothing has been said here yet. Write below, or wait for the first inject."
+      title="Empty conversation"
+    />
+  {:else}
+    {#each messages as message, index (index)}
+      {@const parts = blocks(message)}
+      {@const isResultOnly = parts.every((b) => b.type === "tool_result")}
+      {#if !(isResultOnly && !showResults)}
+        <div
+          class={cn(
+            "flex flex-col gap-1.5",
+            message.role === "user" && !isResultOnly && "items-end"
+          )}
+        >
+          {#each parts as block, blockIndex (blockIndex)}
+            {#if block.type === "text" && block.text}
+              <p
+                class={cn(
+                  "max-w-[75ch] whitespace-pre-wrap rounded-lg px-3 py-2 text-sm",
+                  message.role === "user" ? "bg-primary/10" : "bg-muted/50"
+                )}
+              >
+                {block.text}
+              </p>
+            {:else if block.type === "tool_use"}
+              <p class="flex items-baseline gap-2 px-1 text-xs">
+                <span class="font-medium">{toolLabel(block.name ?? "?")}</span>
+                <span class="truncate text-muted-foreground">
+                  {clip(summarizeInput(block.name ?? "", block.input), 160)}
+                </span>
+              </p>
+            {:else if block.type === "tool_result" && showResults}
+              <pre
+                class={cn(
+                  "max-h-48 max-w-full overflow-auto whitespace-pre-wrap break-all rounded-md p-2 text-xs",
+                  block.is_error
+                    ? "bg-destructive/8 text-destructive"
+                    : "bg-muted/40"
+                )}
+              >{clip(resultText(block), RESULT_CLIP)}</pre>
+            {:else if block.type === "thinking"}
+              <p class="px-1 text-kind-deep text-xs">thinking</p>
+            {/if}
+          {/each}
+        </div>
+      {/if}
+    {/each}
+  {/if}
+  {#if model.question}
+    <QuestionCard {client} {conversationId} question={model.question} />
+  {/if}
+  {#each tail as turn (turn.id)}
+    <TurnCard {now} {turn} />
+  {/each}
+</div>