/**
 * BUG-1047 D3 (TASK-rectification-latency-20260926), live path in the real
 * `RectificationAgenticChat`: a typed answer shows 「收到，正在对照你的档案…」
 * the moment it is sent — before the server has answered at all — and the
 * server's `turn.progress` events move the live row through the four stage
 * lines. Tool events no longer overwrite it with tool names or 「正在分析…」.
 * When the reply settles, no progress line is left in the transcript. A
 * `turn.rejected` event is handled exactly like the old non-2xx response.
 *
 * Harness copied from `rectification-dup-question-20260926.test.tsx`.
 */
import assert from "node:assert/strict";
import test from "node:test";

import { RectificationAgenticChat } from "../src/components/rectification-agentic-chat.tsx";
import { attachQuestionsToTurns } from "../src/lib/rectification-agentic/v9/turn-question.ts";
import type { ConversationFocus } from "../src/lib/rectification-agentic/v9/tool-service.ts";
import { RECTIFICATION_TURN_PROGRESS_LABELS } from "../src/lib/rectification-activity-labels.ts";
import { createClientLifecycleHarness } from "./react-client-lifecycle-test-support.ts";

const CASE_ID = "44444444-4444-4444-8444-444444444444";
const SESSION_ID = "33333333-3333-4333-8333-333333333333";
const FOCUS_1 = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaa1";
const FOCUS_2 = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaa2";
const STEM_1 = "2023 年前后，有没有换过工作或职责明显变化？";
const STEM_2 = "2024 年 3 月前后，有没有收入明显变化、大笔支出或欠债？";

const OPTIONS = [
  { key: "A" as const, label: "明确发生且时间吻合", answer_class: "yes", role: "primary" },
  { key: "B" as const, label: "发生过但程度较弱", answer_class: "weak_yes", role: "primary" },
  { key: "C" as const, label: "没有这回事", answer_class: "no", role: "primary" },
  { key: "D" as const, label: "这段记不清楚", answer_class: "unsure", role: "primary" },
];

function choiceSchema(prompt: string) {
  return {
    prompt,
    probe_id: `probe:${prompt.slice(0, 4)}`,
    choice: {
      prompt,
      option_a: OPTIONS[0].label,
      option_b: OPTIONS[1].label,
      option_c: OPTIONS[2].label,
      option_d: OPTIONS[3].label,
      options: OPTIONS.map(({ key, label, answer_class }) => ({ key, label, answer_class })),
    },
  };
}

function focus(id: string, prompt: string, overrides: Partial<ConversationFocus> = {}): ConversationFocus {
  return {
    id,
    caseId: CASE_ID,
    questionId: `distinguish:${id.slice(-1)}`,
    intent: "distinguish_candidates",
    targetEvidenceId: null,
    targetDomain: "career",
    targetKind: null,
    expectedAnswerSchema: choiceSchema(prompt),
    status: "active",
    askedAt: "2026-09-26T08:00:00.000Z",
    resolvedAt: null,
    askedTurnId: null,
    answerOption: null,
    ...overrides,
  };
}

function choiceCard(focusId: string, prompt: string, questionId: string) {
  return {
    question_id: questionId,
    method_id: "candidate_discriminator",
    prompt,
    choice_mode: "A/B/C/D",
    options: OPTIONS,
    focus_id: focusId,
    case_revision: 3,
    probe_id: `probe:${prompt.slice(0, 4)}`,
  };
}

type RawTurn = { id: string; role: "user" | "assistant"; text: string; status: string };

/** The GET route's turn assembly: the real `attachQuestionsToTurns`. */
function snapshot(rawTurns: RawTurn[], focuses: ConversationFocus[], current: ConversationFocus | null) {
  const turns = attachQuestionsToTurns(rawTurns, focuses);
  const collect = current && current.expectedAnswerSchema.collect === true;
  return {
    case: { status: "collecting_evidence" },
    question_source: current ? "focus" : null,
    current_question: current
      ? {
        kind: collect ? "collect_spoken" : "choice",
        prompt: current.expectedAnswerSchema.prompt,
        focus_id: current.id,
        question_id: current.questionId,
      }
      : null,
    choice_card: current && !collect
      ? choiceCard(current.id, String(current.expectedAnswerSchema.prompt), current.questionId)
      : null,
    turns,
  };
}

function json(body: unknown, status = 200): Response {
  return new Response(JSON.stringify(body), { status, headers: { "content-type": "application/json" } });
}

type Route = (request: { url: string; method: string; body: Record<string, unknown> | null }) => Response | Promise<Response>;

async function mountChat(input: {
  initialTurns: RawTurn[];
  initialFocuses: ConversationFocus[];
  initialCurrent: ConversationFocus | null;
  route: Route;
}) {
  const harness = createClientLifecycleHarness();
  const win = (globalThis as unknown as { window: Record<string, unknown> }).window;
  win.matchMedia = () => ({ matches: false, addEventListener() {}, removeEventListener() {} });
  win.setInterval = setInterval;
  win.clearInterval = clearInterval;
  // Host DOM has no layout: the scroll-anchor hook only needs these to exist.
  const proto = (harness.container as unknown as { constructor: { prototype: Record<string, unknown> } }).constructor.prototype;
  Object.assign(proto, {
    querySelector: () => null,
    querySelectorAll: () => [],
    getBoundingClientRect: () => ({ top: 0, bottom: 0, left: 0, right: 0, width: 0, height: 0 }),
    compareDocumentPosition: () => 0,
    scrollTo() {},
    scrollTop: 0,
    scrollHeight: 0,
    clientHeight: 0,
  });
  const doc = (globalThis as unknown as { document: { createElement: (tag: string) => { style: object } } }).document;
  const create = doc.createElement.bind(doc);
  const styled = <T extends { style: object }>(element: T): T => {
    Object.assign(element.style, { setProperty() {}, removeProperty() {}, getPropertyValue: () => "" });
    return element;
  };
  doc.createElement = (tag: string) => styled(create(tag));
  styled(harness.container as unknown as { style: object });

  const originalFetch = globalThis.fetch;
  const requests: Array<{ url: string; method: string; body: Record<string, unknown> | null }> = [];
  globalThis.fetch = (async (resource: RequestInfo | URL, init?: RequestInit) => {
    const request = {
      url: String(resource),
      method: init?.method ?? "GET",
      body: typeof init?.body === "string" ? JSON.parse(init.body) as Record<string, unknown> : null,
    };
    requests.push(request);
    return input.route(request);
  }) as typeof fetch;

  const initial = snapshot(input.initialTurns, input.initialFocuses, input.initialCurrent);
  await harness.render(
    <RectificationAgenticChat
      caseId={CASE_ID}
      sessionId={SESSION_ID}
      readonly={false}
      shouldStartOpening={false}
      initialTurns={initial.turns}
      initialSnapshot={initial}
      declaredTime="14:50"
      birthDate="1990-06-15"
      models={[]}
      selectedModelId="model"
      onSelectModel={() => {}}
      headerSlot={null}
    />,
  );
  await harness.idle();

  type Host = ReturnType<typeof harness.elements>[number];
  const byTag = (tag: string) => harness.elements().filter((node) => node.tagName === tag);
  const attr = (node: Host, name: string) => node.getAttribute(name);
  const insideDisabledFieldset = (node: Host): boolean => {
    for (let at: Host | null = node; at; at = at.parentNode as Host | null) {
      if (at.tagName === "FIELDSET" && at.hasAttribute("disabled")) return true;
    }
    return false;
  };
  // What a sighted reader sees: screen-reader-only nodes (the card's
  // `<legend className="sr-only">`) are not a second visible stem.
  const visibleText = (node: Host): string => {
    if ((node.props.className as string | undefined)?.split(/\s+/).includes("sr-only")) return "";
    return node.textContent + node.childNodes.map((child) => visibleText(child as Host)).join("");
  };
  const optionButtons = () => byTag("BUTTON").filter((node) => (node.props.className as string | undefined)?.includes("birth-time-choice-option"));
  return {
    harness,
    requests,
    text: () => visibleText(harness.container as Host),
    occurrences: (needle: string) => visibleText(harness.container as Host).split(needle).length - 1,
    cards: () => byTag("SECTION").filter((node) => (node.props.className as string | undefined)?.includes("rectification-choice-card")),
    clickableOptions: () => optionButtons().filter((node) => !insideDisabledFieldset(node)),
    selectedOptions: () => optionButtons().filter((node) => attr(node, "data-selected") === "true"),
    persistedBlocks: () => harness.elements().filter((node) => attr(node, "data-testid") === "persisted-question"),
    async type(message: string) {
      const textarea = byTag("TEXTAREA")[0];
      assert.ok(textarea, "composer textarea");
      await harness.event(textarea, "onChange", { target: { value: message } });
      const form = byTag("FORM")[0];
      assert.ok(form, "composer form");
      await harness.event(form, "onSubmit");
      for (let i = 0; i < 5; i += 1) await harness.idle();
    },
    async tap(label: string) {
      const button = optionButtons().find((node) => node.text.includes(label) && !insideDisabledFieldset(node));
      assert.ok(button, `clickable option ${label}`);
      await harness.event(button, "onClick");
      for (let i = 0; i < 5; i += 1) await harness.idle();
    },
    async close() {
      globalThis.fetch = originalFetch;
      await harness.close();
    },
  };
}

const OPENING: RawTurn = { id: "t0", role: "assistant", text: "眼下按 14:35–15:05 来核对。", status: "completed" };
const LABELS = RECTIFICATION_TURN_PROGRESS_LABELS;
const ALL_LINES = Object.values(LABELS);

function controllableStream() {
  const encoder = new TextEncoder();
  let controller!: ReadableStreamDefaultController<Uint8Array>;
  const body = new ReadableStream<Uint8Array>({ start(c) { controller = c; } });
  let release!: () => void;
  const gate = new Promise<void>((resolve) => { release = resolve; });
  return {
    respond: async () => {
      await gate;
      return new Response(body, { status: 200, headers: { "content-type": "application/x-ndjson; charset=utf-8" } });
    },
    release: () => release(),
    push: (event: unknown) => controller.enqueue(encoder.encode(`${JSON.stringify(event)}\n`)),
    end: () => controller.close(),
  };
}

async function settle(chat: { harness: { idle(): Promise<void> } }) {
  for (let i = 0; i < 8; i += 1) {
    await chat.harness.idle();
    await new Promise((resolve) => setTimeout(resolve, 5));
  }
}

function shown(chat: { text(): string }) {
  const text = chat.text();
  return ALL_LINES.filter((line) => text.includes(line));
}

test("D3 · the first stage line shows on send (before any server byte), then follows turn.progress; none survives the settle", async () => {
  const q1 = focus(FOCUS_1, STEM_1, { askedTurnId: "t0" });
  const stream = controllableStream();
  const reply = "记下了：2023 年 3 月换了工作。";
  const chat = await mountChat({
    initialTurns: [OPENING],
    initialFocuses: [q1],
    initialCurrent: q1,
    route: ({ method }) => {
      if (method === "POST") return stream.respond();
      const q2 = focus(FOCUS_2, STEM_2, { askedTurnId: "t2" });
      return json(snapshot([
        OPENING,
        { id: "t1", role: "user", text: "2023 年 3 月换了工作", status: "completed" },
        { id: "t2", role: "assistant", text: reply, status: "completed" },
      ], [{ ...q1, status: "resolved" as const }, q2], q2));
    },
  });
  try {
    const sentAt = Date.now();
    await chat.type("2023 年 3 月换了工作");
    // The fetch has not resolved yet: this line is on screen with no server byte.
    assert.deepEqual(shown(chat), [LABELS.received], chat.text());
    assert.ok(Date.now() - sentAt <= 300, "first progress line within 300 ms of send");
    assert.equal(chat.text().includes("正在处理…"), false);

    stream.release();
    stream.push({ type: "turn.progress", stage: "received" });
    await settle(chat);
    assert.deepEqual(shown(chat), [LABELS.received]);

    stream.push({ type: "run.started" });
    stream.push({ type: "tool.activity", tool: "rectification-read-case", status: "started" });
    stream.push({ type: "tool.activity", tool: "rectification-read-case", status: "completed" });
    await settle(chat);
    assert.deepEqual(shown(chat), [LABELS.received], "a tool name or 正在分析… does not replace the stage line");
    assert.equal(chat.text().includes("正在分析…"), false);
    // 原值: "正在读取校正记录…" / 新值: "正在看你的资料…" / 原因: BUG-1050 读档工具的进行中句改大白话；断言含义不变（工具句不顶替阶段句）
    assert.equal(chat.text().includes("正在看你的资料…"), false);

    stream.push({ type: "turn.progress", stage: "recording" });
    stream.push({ type: "tool.activity", tool: "rectification-record-evidence-batch", status: "started" });
    await settle(chat);
    assert.deepEqual(shown(chat), [LABELS.recording]);
    // 原值: 断言不出现 "正在整理多条事件证据…" / 新值: 批量记录工具的进行中句就是阶段句「正在记下这件事…」，只出现一行 / 原因: BUG-1050 工具句改大白话后与 BUG-1047 阶段句同文
    assert.equal(chat.text().includes("正在整理多条事件证据…"), false);
    assert.equal(chat.text().split(LABELS.recording).length - 1, 1);

    stream.push({ type: "turn.progress", stage: "rescoring" });
    await settle(chat);
    assert.deepEqual(shown(chat), [LABELS.rescoring]);

    stream.push({ type: "tool.activity", tool: "rectification-record-evidence-batch", status: "completed" });
    stream.push({ type: "turn.progress", stage: "preparing_question" });
    await settle(chat);
    assert.deepEqual(shown(chat), [LABELS.preparing_question]);

    stream.push({ type: "answer.delta", text: reply });
    stream.push({ type: "run.completed", turnId: "t2" });
    stream.end();
    await settle(chat);
    assert.equal(chat.harness.errors.length, 0, String(chat.harness.errors[0] ?? ""));
    assert.deepEqual(shown(chat), [], `no progress line after settle:\n${chat.text()}`);
    assert.equal(chat.occurrences(reply), 1);
  } finally {
    await chat.close();
  }
});

test("D3 · turn.rejected on the open stream behaves like the old HTTP rejection: row gone, typed mark withdrawn, message shown", async () => {
  const q1 = focus(FOCUS_1, STEM_1, { askedTurnId: "t0" });
  const stream = controllableStream();
  const chat = await mountChat({
    initialTurns: [OPENING],
    initialFocuses: [q1],
    initialCurrent: q1,
    route: ({ method }) => (method === "POST" ? stream.respond() : json(snapshot([OPENING], [q1], q1))),
  });
  try {
    await chat.type("换过");
    assert.deepEqual(shown(chat), [LABELS.received]);
    stream.release();
    stream.push({ type: "turn.progress", stage: "received" });
    stream.push({ type: "turn.rejected", httpStatus: 409, code: "stale_question", message: "这道题已经过期，请回答当前问题" });
    await settle(chat);
    assert.deepEqual(shown(chat), [], chat.text());
    assert.ok(chat.text().includes("这道题已经过期，请回答当前问题"), chat.text());
    assert.equal(chat.cards().length, 1);
    assert.equal(chat.clickableOptions().length, 4, "the typed mark is withdrawn: the card is tappable again");
    assert.equal(chat.occurrences(STEM_1), 1);
  } finally {
    await chat.close();
  }
});