import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";
import { runInNewContext } from "node:vm";
import ts from "typescript";

import { createSession } from "../src/lib/home-cloud-sync.ts";
import { runHomeBootstrap, type HomeBootstrapDeps } from "../src/lib/home-bootstrap-run.ts";
import { pendingConsultationStorageKey, previewModelCatalog, emptyProfile, type Account, type ChatSession } from "../src/lib/home-types.ts";
import { isUnsavedEmptyConsultation } from "../src/lib/session-list-filter.ts";
import type { SessionListBoot } from "../src/lib/session-list-context.tsx";

const run = readFileSync(new URL("../src/hooks/use-consultation-run.ts", import.meta.url), "utf8");

function sourceBetween(source: string, start: string, end: string): string {
  const from = source.indexOf(start);
  const to = source.indexOf(end, from);
  assert.ok(from >= 0 && to > from, `missing source boundary: ${start}`);
  return source.slice(from, to);
}

function installBrowserHosts() {
  const host = globalThis as { window?: unknown; localStorage?: Storage };
  if (host.window === undefined) host.window = globalThis;
  if (!host.localStorage) {
    const data = new Map<string, string>();
    host.localStorage = {
      getItem: (key) => data.get(key) ?? null,
      setItem: (key, value) => { data.set(key, String(value)); },
      removeItem: (key) => { data.delete(key); },
      clear: () => data.clear(),
      key: (index) => Array.from(data.keys())[index] ?? null,
      get length() { return data.size; },
    };
  }
}

function bindRestore(sandbox: Record<string, unknown>) {
  const recovery = sourceBetween(run, "  function restoreConsultationRecovery(", "  consultationRecoveryCheck.current =");
  const compiled = ts.transpileModule(
    `${recovery}\n__boundRestore = restoreConsultationRecovery;`,
    { compilerOptions: { target: ts.ScriptTarget.ES2022 } },
  ).outputText;
  const box: Record<string, unknown> = { __boundRestore: undefined, ...sandbox };
  runInNewContext(compiled, box);
  return box.__boundRestore as (session: ChatSession, requestId: string, stored?: unknown) => void;
}

function account(): Account {
  return {
    user: { id: "account-1", email: "reader@example.com" },
    avatar: null,
    credits: 3,
    isAdmin: false,
    adminUrl: null,
    rectificationPriceCredits: 1,
    activeSubscription: null,
    hasConfirmedBirthTime: false,
    hasUsableBirthTime: false,
    profile: emptyProfile,
  };
}

async function bootstrapWithRecovery(urlAction: "new-chat" | "none" | "keep") {
  // 原值：把 page.tsx 激活段和 hook 里的 restore 一起塞进 vm。
  // 新值：直接调用 runHomeBootstrap，restore 仍是 hook 里的真实函数。
  // 原因：启动流程已搬出 page.tsx；调用整段函数还覆盖 new-chat 会新建空咨询。
  installBrowserHosts();
  const oldSession = createSession("test-model");
  oldSession.messages = [{ role: "user", text: "测试问题" }];
  const localSession = createSession("test-model");
  const pending: { current: { sessionId: string; phase: string } | null } = { current: null };
  const state = {
    active: "",
    pendingSession: "",
    pendingRequest: "",
    phase: "",
    notice: "",
    storedCleared: false,
    sessions: [] as ChatSession[],
  };
  const writes: unknown[][] = [];
  const memory = new Map<string, string>();
  const sandbox = {
    AbortController,
    navigator: { onLine: true },
    pendingConsultation: pending,
    pendingConsultationStorageKey,
    sessionStorage: {
      getItem: (key: string) => memory.get(key) ?? null,
      setItem: (key: string, value: string) => { memory.set(key, value); },
      removeItem: (key: string) => { memory.delete(key); },
    },
    sessions: [localSession, oldSession],
    consultSendBlockedByRectificationSession: () => false,
    isGenericSessionTitle: () => false,
    resolveSessionTitle: () => "新对话",
    timestamp: () => 1,
    updateSession: () => { assert.fail("the existing user question must not be duplicated"); },
    setActiveSessionId: (id: string) => { state.active = id; },
    setPendingSessionId: (id: string) => { state.pendingSession = id; },
    setPendingRequestId: (id: string) => { state.pendingRequest = id; },
    setConsultationPhase: (phase: string) => { state.phase = phase; },
    setStreamingReply: () => undefined,
    setComposerNotice: (notice: string) => { state.notice = notice; },
  };
  const restore = bindRestore(sandbox);
  const boot: SessionListBoot = {
    sessions: [localSession, oldSession],
    rawRows: [],
    cursor: null,
    account: account(),
    signedOut: false,
  };
  const deps: HomeBootstrapDeps = {
    sessionListReady: Promise.resolve(),
    sessionListBoot: () => boot,
    uiPreview: { current: false },
    uiPreviewMode: { current: null },
    consultationStatusMissingCount: { current: 0 },
    isDevelopment: false,
    readSearch: () => "",
    storage: {
      getItem: () => null,
      removeItem: () => undefined,
    },
    restoreConsultationRecovery: restore,
    setComposerNotice: sandbox.setComposerNotice,
    commit: {
      setAccount: () => undefined,
      setAccountError: () => undefined,
      setActiveSessionId: sandbox.setActiveSessionId,
      setBirthTimeAssessmentPhase: () => undefined,
      setBirthTimeJourney: () => undefined,
      setBootstrapPhase: () => undefined,
      setGuidedJourneyPreview: () => undefined,
      setHydrated: () => undefined,
      setModelCatalog: () => undefined,
      setOnboardingStep: () => undefined,
      setProfile: () => undefined,
      setProfileDraft: () => undefined,
      setSessions: (sessions) => { state.sessions = sessions; },
      setSessionsCursor: () => undefined,
      setStartGreeting: () => undefined,
    },
    io: {
      fetchModelCatalog: async () => previewModelCatalog,
      fetchActiveConsultationStatus: async () => ({
        status: "reserved",
        sessionId: oldSession.id,
        requestId: "33333333-3333-4333-8333-333333333333",
      }),
      resolveLookupBootstrap: async (input) => ({
        selection: {
          sessionId: localSession.id,
          urlAction,
          missing: false,
        },
        sessions: input.sessions,
        notice: null,
      }),
      writeSessionUrl: (...args: unknown[]) => { writes.push(args); },
      clearLoginSessionReturn: () => { state.storedCleared = true; },
    },
  };
  await runHomeBootstrap(deps, new AbortController().signal);
  return { state, pending, writes, localSession, oldSession };
}

test("new chat keeps its local landing while a reserved older consultation recovers", async () => {
  const { state, pending, writes, oldSession } = await bootstrapWithRecovery("new-chat");
  const landing = state.sessions[0];
  assert.ok(landing);
  assert.equal(state.active, landing.id);
  assert.notEqual(landing.id, oldSession.id);
  assert.equal(isUnsavedEmptyConsultation(landing), true);
  assert.equal(state.notice, "");
  assert.equal(state.storedCleared, true);
  assert.deepEqual(writes, [[null, "replace"]]);
  assert.equal(state.pendingSession, oldSession.id);
  assert.equal(state.pendingRequest, "33333333-3333-4333-8333-333333333333");
  assert.equal(state.phase, "recovering");
  assert.equal(pending.current?.sessionId, oldSession.id);
  assert.equal(pending.current?.phase, "recovering");
});

test("bare / keeps the blank starter home while a reserved older consultation recovers (BUG-1052)", async () => {
  // 原值: 标题 "ordinary home landing still activates and announces the reserved consultation"；
  //   none → state.active === oldSession.id，notice「回答仍在后台生成，正在自动恢复。」，storedCleared === false。
  // 新值: none → 停在空白首页（本地空对话 localSession），notice 清空，恢复照常在后台进行；storedCleared === true。
  // 原因: BUG-1052 D1——裸 `/` 永远落空白首页、不落旧对话，与 BUG-1015 的 ?new=1 同一条「不抢落点」规则；
  //   D3——启动一律清掉旧版本留下的存根值。「地址栏点名会话时恢复可以接管」改由下一条 keep 用例锁住。
  const { state, pending, writes, localSession, oldSession } = await bootstrapWithRecovery("none");
  assert.equal(state.active, localSession.id);
  assert.equal(isUnsavedEmptyConsultation(state.sessions.find((item) => item.id === state.active)!), true);
  assert.equal(state.notice, "");
  assert.equal(state.storedCleared, true);
  assert.deepEqual(writes, []);
  assert.equal(state.pendingSession, oldSession.id);
  assert.equal(state.phase, "recovering");
  assert.equal(pending.current?.sessionId, oldSession.id);
});

test("a ?c= landing still activates and announces the reserved consultation", async () => {
  const { state, pending, writes, oldSession } = await bootstrapWithRecovery("keep");
  assert.equal(state.active, oldSession.id);
  assert.equal(state.notice, "回答仍在后台生成，正在自动恢复。");
  assert.deepEqual(writes, []);
  assert.equal(pending.current?.sessionId, oldSession.id);
});