import assert from "node:assert/strict";
import { createElement, createRef } from "react";
import { renderToString } from "react-dom/server";
import test from "node:test";

import {
  SettledMessageList,
  StreamingMessageEntry,
  UnsplitChatTranscript,
  type ChatTranscriptActions,
  type ChatTranscriptProps,
} from "../src/components/chat-transcript.tsx";
import type { ChatMessage } from "../src/lib/chat-message-view.ts";
import { streamingChatMessageView } from "../src/lib/chat-message-view.ts";
import {
  disableHomeStreamingRenderProbe,
  enableHomeStreamingRenderProbe,
  homeStreamingRenderProbeSnapshot,
  resetHomeStreamingRenderProbe,
} from "../src/lib/home-streaming-render-probe.ts";

function propsFor(messages: readonly ChatMessage[]): Omit<ChatTranscriptProps, "loading" | "streamingText"> {
  const actionsRef = createRef<ChatTranscriptActions>() as ChatTranscriptProps["actionsRef"];
  actionsRef.current = {
    onFeedback() {},
    onCopy() {},
    onRegenerate() {},
    onFollowUp() {},
  };
  return {
    messages,
    sessionId: "session-test",
    sessionType: "consultation",
    theme: "career",
    messageFeedback: {},
    copiedMessageKey: null,
    cancellationPending: false,
    productEntrypointsDisabled: true,
    actionsRef,
  };
}

test("the split architecture renders settled history once while streaming tokens", () => {
  const messages: ChatMessage[] = [
    { role: "user", text: "问题一" },
    { role: "assistant", text: "回答一，需要足够长才能生成追问卡片。" },
    { role: "user", text: "问题二" },
    { role: "assistant", text: "回答二，需要足够长才能生成追问卡片。" },
    { role: "user", text: "请继续说明这个月的安排。" },
  ];
  const tokens = ["甲", "甲乙", "甲乙丙", "甲乙丙丁", "甲乙丙丁戊"];
  const base = propsFor(messages);

  resetHomeStreamingRenderProbe();
  enableHomeStreamingRenderProbe();
  renderToString(createElement(SettledMessageList, { ...base, loading: true }));
  for (const streamingText of tokens) {
    const streamingMessage = streamingChatMessageView(messages, true, streamingText);
    assert.ok(streamingMessage);
    renderToString(createElement(StreamingMessageEntry, { message: streamingMessage }));
  }
  const split = homeStreamingRenderProbeSnapshot();
  disableHomeStreamingRenderProbe();

  resetHomeStreamingRenderProbe();
  enableHomeStreamingRenderProbe();
  for (const streamingText of tokens) {
    renderToString(createElement(UnsplitChatTranscript, { ...base, loading: true, streamingText }));
  }
  const unsplit = homeStreamingRenderProbeSnapshot();
  disableHomeStreamingRenderProbe();

  assert.equal(split.settledListRenders, 1);
  assert.equal(split.streamingRowRenders, tokens.length);
  assert.equal(unsplit.unsplitListRenders, tokens.length);
  assert.ok(unsplit.settledRowRenders > split.settledRowRenders);
});