import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";

import {
  BOOTSTRAP_PREPARE_TIMEOUT_MS,
  HOME_BOOTSTRAP_SLOW_MS,
  SESSION_PREFETCH_COUNT,
  bootstrapLoadingCopy,
  bootstrapPrepareSettled,
  bootstrapRevealDelayMs,
  landingYieldsToRecovery,
  resolveStarterHomeLandingSessionId,
  sessionIdsToPrefetch,
  shouldAutoOpenRectificationSession,
  starterHomeLandingNeedsConsultation,
} from "../src/lib/home-bootstrap.ts";
import { homeSurface } from "./home-surface.ts";

// Product rule (2026-09-02): the loading screen owns every wait. After the home
// page is revealed there is no component-level spinner left — only the streaming
// answer keeps a live marker, because that is content being generated, not data
// being loaded.

const page = readFileSync(new URL("../src/app/(app)/page.tsx", import.meta.url), "utf8");
const bootstrapRun = readFileSync(new URL("../src/lib/home-bootstrap-run.ts", import.meta.url), "utf8");
const bootstrapError = readFileSync(new URL("../src/components/home-bootstrap-error.tsx", import.meta.url), "utf8");
const starterHome = readFileSync(new URL("../src/components/starter-home.tsx", import.meta.url), "utf8");
const globalsCss = readFileSync(new URL("../src/app/globals.css", import.meta.url), "utf8");
const staleClientRecovery = readFileSync(new URL("../src/components/stale-client-recovery.tsx", import.meta.url), "utf8");

const rectificationId = "11111111-1111-4111-8111-111111111111";
const consultationId = "22222222-2222-4222-8222-222222222222";
const emptyConsultationId = "33333333-3333-4333-8333-333333333333";

test("bare / after login does not auto-open the latest rectification session", () => {
  assert.equal(shouldAutoOpenRectificationSession({
    sessionType: "birth_time_rectification",
    sessionId: rectificationId,
    search: "",
  }), false);
  assert.equal(shouldAutoOpenRectificationSession({
    sessionType: "birth_time_rectification",
    sessionId: rectificationId,
    search: `?c=${rectificationId}`,
  }), true);
  assert.equal(shouldAutoOpenRectificationSession({
    sessionType: "birth_time_rectification",
    sessionId: rectificationId,
    search: `?c=${consultationId}`,
  }), false);
  assert.equal(shouldAutoOpenRectificationSession({
    sessionType: "consultation",
    sessionId: consultationId,
    search: `?c=${consultationId}`,
  }), false);
});

test("default landing replaces a latest rectification session with an empty consultation", () => {
  const sessions = [
    { id: rectificationId, sessionType: "birth_time_rectification", messages: [] },
    { id: emptyConsultationId, sessionType: "consultation", messages: [] },
    { id: consultationId, sessionType: "consultation", messages: [{ role: "user" }] },
  ];
  assert.equal(resolveStarterHomeLandingSessionId(sessions, rectificationId, "none"), emptyConsultationId);
  assert.equal(resolveStarterHomeLandingSessionId(sessions, rectificationId, "replace-clear"), emptyConsultationId);
  assert.equal(resolveStarterHomeLandingSessionId(sessions, rectificationId, "keep"), rectificationId);
  // 原值: resolveStarterHomeLandingSessionId(sessions, rectificationId, "replace-selected") === rectificationId。
  // 新值: 该 urlAction 已删除，改为断言 lookup（`?c=` 查到后）同样保留所选会话。
  // 原因: BUG-1052 D3 删除登录返回存根，replace-selected 只服务存根。
  assert.equal(resolveStarterHomeLandingSessionId(sessions, rectificationId, "lookup"), rectificationId);
  // 原值: resolveStarterHomeLandingSessionId(sessions, consultationId, "none") === consultationId（裸 `/` 打开最近普通对话）。
  // 新值: === emptyConsultationId（裸 `/` 落空白首页，复用已有空草稿）。
  // 原因: BUG-1052 D1 产品决策——裸 `/` 永远是空白首页，不落旧对话。
  assert.equal(resolveStarterHomeLandingSessionId(sessions, consultationId, "none"), emptyConsultationId);
  assert.equal(
    starterHomeLandingNeedsConsultation(
      [{ id: rectificationId, sessionType: "birth_time_rectification", messages: [] }],
      rectificationId,
      "none",
    ),
    true,
  );
  assert.equal(
    starterHomeLandingNeedsConsultation(sessions, emptyConsultationId, "none"),
    false,
  );
  assert.equal(
    starterHomeLandingNeedsConsultation(sessions, rectificationId, "keep"),
    false,
  );
  // 原值: page.tsx 直接调用 resolveStarterHomeLandingSessionId / starterHomeLandingNeedsConsultation。
  // 新值: 这两个调用在 home-bootstrap-run.ts；page.tsx 仍调用 shouldAutoOpenRectificationSession。
  // 原因: 启动落点搬进 runHomeBootstrap，揭幕阶段的校正会话判断留在首页。
  assert.match(bootstrapRun, /resolveStarterHomeLandingSessionId\(/);
  assert.match(page, /shouldAutoOpenRectificationSession\(/);
  assert.match(bootstrapRun, /starterHomeLandingNeedsConsultation\(/);
});

test("new chat landing requests a fresh consultation even with an existing ordinary chat", () => {
  const sessions = [
    { id: consultationId, sessionType: "consultation", messages: [{ role: "user" }] },
    { id: emptyConsultationId, sessionType: "consultation", messages: [] },
    { id: rectificationId, sessionType: "birth_time_rectification", messages: [] },
  ];
  for (const session of sessions) {
    assert.equal(resolveStarterHomeLandingSessionId(sessions, session.id, "new-chat"), session.id);
    assert.equal(starterHomeLandingNeedsConsultation(sessions, session.id, "new-chat"), true);
  }
  assert.equal(starterHomeLandingNeedsConsultation([], consultationId, "new-chat"), true);
});

test("bare home with a latest ordinary chat lands on a new blank starter home (BUG-1052)", () => {
  // 原值: 标题 "bare home still opens the selected ordinary chat without creating another"；
  //   none → consultationId，NeedsConsultation === false。
  // 新值: none → 仍返回 consultationId（没有空草稿可复用），但 NeedsConsultation === true，启动会本地新建空对话落地。
  // 原因: BUG-1052 D1——登录后 / 地址栏 / 书签 / 刷新裸 `/` 都落空白首页，不再打开最近一条旧对话。
  const sessions = [{ id: consultationId, sessionType: "consultation", messages: [{ role: "user" }] }];
  assert.equal(resolveStarterHomeLandingSessionId(sessions, consultationId, "none"), consultationId);
  assert.equal(starterHomeLandingNeedsConsultation(sessions, consultationId, "none"), true);
});

test("a list row whose messages were not loaded is not mistaken for the blank home", () => {
  // The session list can omit messages (messagesHydrated false). Such a row is
  // a saved conversation, not an empty draft, so bare `/` must not land on it.
  const sessions = [
    { id: consultationId, sessionType: "consultation", messages: [], messagesHydrated: false },
    { id: rectificationId, sessionType: "birth_time_rectification", messages: [] },
  ];
  assert.equal(resolveStarterHomeLandingSessionId(sessions, consultationId, "none"), consultationId);
  assert.equal(starterHomeLandingNeedsConsultation(sessions, consultationId, "none"), true);
  assert.equal(resolveStarterHomeLandingSessionId(sessions, rectificationId, "none"), rectificationId);
  assert.equal(starterHomeLandingNeedsConsultation(sessions, rectificationId, "none"), true);
  // An archived empty row is not a draft either.
  const archived = [{ id: emptyConsultationId, sessionType: "consultation", messages: [], archivedAt: "2026-09-01T00:00:00Z" }];
  assert.equal(starterHomeLandingNeedsConsultation(archived, emptyConsultationId, "none"), true);
  // A dead `?c=` (replace-clear) lands on the blank home too.
  assert.equal(starterHomeLandingNeedsConsultation(sessions, consultationId, "replace-clear"), true);
});

test("a background answer takes the screen only when the address bar named a conversation", () => {
  assert.equal(landingYieldsToRecovery("keep"), true);
  assert.equal(landingYieldsToRecovery("lookup"), true);
  assert.equal(landingYieldsToRecovery("none"), false);
  assert.equal(landingYieldsToRecovery("replace-clear"), false);
  assert.equal(landingYieldsToRecovery("new-chat"), false);
});

test("prepare phase settles only when every applicable item has an answer", () => {
  // 原值: BootstrapPrepareState 含 profileComplete + onboardingSettled，未完成建议问题不得揭幕。
  // 新值: 揭幕只等入口摘要、今日星语（若适用）与校正会话（若适用）。
  // 原因: 主题卡与 /api/onboarding 已下线，建议问题不再挡首页。
  const base = {
    dailyStarlanguageApplicable: true,
    dailyStarlanguageSettled: true,
    entrySummarySettled: true,
  };
  assert.equal(bootstrapPrepareSettled(base), true);
  assert.equal(bootstrapPrepareSettled({ ...base, entrySummarySettled: false }), false);
  assert.equal(bootstrapPrepareSettled({ ...base, dailyStarlanguageSettled: false }), false);
  assert.equal(bootstrapPrepareSettled({ ...base, dailyStarlanguageApplicable: false, dailyStarlanguageSettled: false }), true);
});

test("home bootstrap keeps one slow-network budget before the fatal screen", () => {
  // 原值: 首页账户阶段使用 8000ms 内联总超时。
  // 新值: 账户、模型与状态等待共享 20000ms，超时后只显示错误屏。
  // 原因: 慢网串行链需要一次等待一次揭幕，不能半揭幕或提前放弃。
  assert.equal(HOME_BOOTSTRAP_SLOW_MS, 20_000);
  // 原值: page.tsx 引用 HOME_BOOTSTRAP_SLOW_MS。
  // 新值: 20 秒预算在 runHomeBootstrap 里。
  // 原因: 超时属于启动流程，首页只调用这个函数。
  assert.match(bootstrapRun, /HOME_BOOTSTRAP_SLOW_MS/);
  assert.doesNotMatch(page, /\}, 8000\);/);
  assert.doesNotMatch(bootstrapRun, /\}, 8000\);/);
});

test("reveal delay is zero once settled and counts down from the phase start otherwise", () => {
  assert.equal(BOOTSTRAP_PREPARE_TIMEOUT_MS, 4000);
  assert.equal(bootstrapRevealDelayMs(10_000, 9_000, true), 0);
  assert.equal(bootstrapRevealDelayMs(10_000, 9_000, false), 3000);
  assert.equal(bootstrapRevealDelayMs(20_000, 9_000, false), 0);
  assert.equal(bootstrapRevealDelayMs(10_000, null, false), BOOTSTRAP_PREPARE_TIMEOUT_MS);
});

test("loading copy changes per phase so the single loading screen narrates progress", () => {
  const account = bootstrapLoadingCopy("account");
  const prepare = bootstrapLoadingCopy("prepare");
  assert.notEqual(account.title, prepare.title);
  assert.notEqual(account.detail, prepare.detail);
  assert.match(page, /const loadingCopy = bootstrapLoadingCopy\(bootstrapPhase\);/);
  assert.match(page, /<AppLoadingIndicator title=\{loadingCopy\.title\} detail=\{loadingCopy\.detail\} \/>/);
});

test("bootstrap enters the prepare phase instead of revealing after the account fetch", () => {
  // 原值: `if (bootstrapFailed) setHydrated(true); else setBootstrapPhase("prepare");` 写在 page.tsx。
  // 新值: 同一分支写在 runHomeBootstrap，setter 经 deps.commit 注入。
  // 原因: 失败仍揭幕错误屏，成功仍进入 prepare，不半揭幕。
  assert.match(bootstrapRun, /if \(bootstrapFailed\) deps\.commit\.setHydrated\(true\);\n\s*else deps\.commit\.setBootstrapPhase\("prepare"\);/);
  // 原值: 3 个 prepare 守卫（onboarding / 今日星语 / 入口摘要）。
  // 新值: 2 个（今日星语 / 入口摘要）。
  // 原因: 建议问题请求已删除。
  const binder = readFileSync(new URL("../src/components/daily-starlanguage-binder.tsx", import.meta.url), "utf8");
  const guards = `${page}\n${binder}`.match(/if \(bootstrapPhase === "account" \|\| !accountId/g) ?? [];
  assert.equal(guards.length, 2, "daily starlanguage and entry summary must both key off bootstrapPhase");
  assert.match(page, /setRectificationEntrySummarySettled\(true\);/);
  assert.match(page, /bootstrapRevealDelayMs\(Date\.now\(\), prepareStartedAt\.current, bootstrapPrepareReady\)/);
  assert.match(page, /window\.setTimeout\(\(\) => setHydrated\(true\), delay\)/);
  assert.match(page, /void import\("@\/components\/birth-time-rectification"\);/);
});

test("revealed home carries no component loading state", () => {
  assert.doesNotMatch(page, /starter-loading/);
  assert.doesNotMatch(starterHome, /starter-loading|dailyStarlanguageBusy|aria-busy=\{/);
  assert.doesNotMatch(globalsCss, /\.starter-loading/);
  assert.doesNotMatch(page, /InlineSpinner/);
  assert.doesNotMatch(page, /dailyStarlanguageBusy|正在写下今天的星语/);
  // Switching to a session whose messages are not cached keeps a silent placeholder.
  assert.match(page, /className="message-list session-messages-loading" role="status" aria-busy="true" aria-live="polite">\n\s*<span className="sr-only">正在加载聊天记录<\/span>/);
});

test("recent sessions are prefetched after reveal so switches do not wait", () => {
  assert.equal(SESSION_PREFETCH_COUNT, 5);
  const sessions = [
    { id: "active", sessionType: "consultation" },
    { id: "a", sessionType: "consultation" },
    { id: "b", sessionType: "consultation", messagesHydrated: true },
    { id: "r", sessionType: "birth_time_rectification" },
    { id: "c", sessionType: "consultation" },
    { id: "d", sessionType: "consultation" },
    { id: "e", sessionType: "consultation" },
    { id: "f", sessionType: "consultation" },
    { id: "g", sessionType: "consultation" },
  ];
  assert.deepEqual(sessionIdsToPrefetch(sessions, "active"), ["a", "c", "d", "e", "f"]);
  assert.match(page, /sessionIdsToPrefetch\(sessionsRef\.current, activeSessionIdRef\.current\)/);
  assert.match(page, /await ensureSessionMessages\(sessionId\);/);
});

test("the loading screen DOM contract stale-client recovery depends on is untouched", () => {
  assert.match(page, /<main className="app-loading" aria-busy="true" aria-live="polite">/);
  // 原值: 错误屏 main 写在 page.tsx。
  // 新值: 同一段 main 在 home-bootstrap-error.tsx。
  // 原因: 错误屏抽成组件，class 与 role 不变，僵死恢复脚本仍能找到它。
  assert.match(bootstrapError, /<main className="app-loading app-loading-error">/);
  assert.match(staleClientRecovery, /main\.app-loading\[aria-busy="true"\]/);
  assert.match(staleClientRecovery, /main\.app-loading-error/);
  assert.ok(homeSurface.includes("bootstrapPrepareSettled("));
});