import assert from "node:assert/strict";
import test from "node:test";

import { ConsultationStatusError, createSession, LoginRedirectError } from "../src/lib/home-cloud-sync.ts";
import {
  HOME_BOOTSTRAP_TIMEOUT_MESSAGE,
  runHomeBootstrap,
  type HomeBootstrapDeps,
  type HomeBootstrapIo,
} from "../src/lib/home-bootstrap-run.ts";
import { HOME_BOOTSTRAP_SLOW_MS } from "../src/lib/home-bootstrap.ts";
import {
  emptyProfile,
  pendingConsultationStorageKey,
  previewModelCatalog,
  type Account,
  type ChatSession,
  type ConsultationStatus,
} from "../src/lib/home-types.ts";
import type { SessionListBoot } from "../src/lib/session-list-context.tsx";
import { bindCurrentSubjectAccount, readCurrentSubjectId, resetSubjectCatalogForTests, setCurrentSubject } from "../src/lib/current-subject.ts";
import { installWindow, withFakeTimers } from "./home-bootstrap-fake-timers.ts";

function installBrowserHosts() {
  installWindow();
  const host = globalThis as { localStorage?: Storage };
  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 memoryStorage() {
  const data = new Map<string, string>();
  return {
    getItem: (key: string) => data.get(key) ?? null,
    removeItem: (key: string) => { data.delete(key); },
    setItem: (key: string, value: string) => { data.set(key, value); },
  };
}

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,
  };
}

function createHarness(options: {
  sessions: ChatSession[];
  signedOut?: boolean;
  io?: Partial<HomeBootstrapIo>;
  restoreConsultationRecovery?: HomeBootstrapIo["restoreConsultationRecovery"];
} ) {
  installBrowserHosts();
  const state: {
    account: Account | null;
    error: string;
    hydrated: boolean;
    phase: string;
    sessions: ChatSession[];
    active: string;
    notice: string;
    profileSet: boolean;
    catalogSet: boolean;
  } = {
    account: null,
    error: "",
    hydrated: false,
    phase: "",
    sessions: [] as ChatSession[],
    active: "",
    notice: "",
    profileSet: false,
    catalogSet: false,
  };
  const commits: string[] = [];
  const storage = memoryStorage();
  const boot: SessionListBoot = {
    sessions: options.sessions,
    rawRows: [],
    cursor: "cursor-1",
    account: options.signedOut ? null : account(),
    signedOut: options.signedOut ?? false,
  };
  const note = (name: string) => { commits.push(name); };
  const deps: HomeBootstrapDeps = {
    sessionListReady: Promise.resolve(),
    sessionListBoot: () => boot,
    uiPreview: { current: false },
    uiPreviewMode: { current: null },
    consultationStatusMissingCount: { current: 0 },
    isDevelopment: false,
    readSearch: () => "",
    storage,
    restoreConsultationRecovery: options.restoreConsultationRecovery ?? (() => undefined),
    setComposerNotice: (notice) => { state.notice = notice; note("notice"); },
    commit: {
      setAccount: (value) => { state.account = value; note("account"); },
      setAccountError: (value) => { state.error = value; note("error"); },
      setActiveSessionId: (id) => { state.active = id; note("active"); },
      setBirthTimeAssessmentPhase: () => note("assessment"),
      setBirthTimeJourney: () => note("journey"),
      setBootstrapPhase: (phase) => { state.phase = phase; note("phase"); },
      setGuidedJourneyPreview: () => note("preview"),
      setHydrated: (value) => { state.hydrated = value; note("hydrated"); },
      setModelCatalog: () => { state.catalogSet = true; note("catalog"); },
      setOnboardingStep: () => note("onboarding"),
      setProfile: () => { state.profileSet = true; note("profile"); },
      setProfileDraft: () => note("draft"),
      setSessions: (sessions) => { state.sessions = sessions; note("sessions"); },
      setSessionsCursor: () => note("cursor"),
      setStartGreeting: () => note("greeting"),
    },
    io: {
      fetchModelCatalog: async () => previewModelCatalog,
      fetchActiveConsultationStatus: async () => null,
      fetchConsultationStatus: async () => {
        throw new Error("unexpected status read");
      },
      resolveLookupBootstrap: async (input) => ({
        selection: {
          sessionId: input.defaultSessionId,
          urlAction: "none",
          missing: false,
          clearStoredReturn: false,
        },
        sessions: input.sessions,
        notice: null,
      }),
      ...options.io,
    },
  };
  return { deps, state, commits, storage };
}

async function waitUntil(predicate: () => boolean) {
  for (let attempt = 0; attempt < 30; attempt += 1) {
    if (predicate()) return;
    await Promise.resolve();
  }
  assert.equal(predicate(), true);
}

test("a successful bootstrap fills the home once, after every read has settled", async () => {
  const session = createSession(previewModelCatalog.defaultModelId);
  let lookupStarted = false;
  let releaseLookup: () => void = () => undefined;
  const lookupGate = new Promise<void>((resolve) => { releaseLookup = resolve; });
  const { deps, state, commits } = createHarness({
    sessions: [session],
    io: {
      resolveLookupBootstrap: async (input) => {
        lookupStarted = true;
        await lookupGate;
        return {
          selection: {
            sessionId: input.defaultSessionId,
            urlAction: "none",
            missing: false,
            clearStoredReturn: false,
          },
          sessions: input.sessions,
          notice: null,
        };
      },
    },
  });
  const pending = runHomeBootstrap(deps, new AbortController().signal);
  await waitUntil(() => lookupStarted);
  assert.equal(state.account === null, true);
  assert.equal(state.sessions.length, 0);
  assert.equal(state.phase, "");
  assert.equal(state.hydrated, false);
  releaseLookup();
  await pending;
  assert.equal(state.account?.user.id, "account-1");
  assert.equal(state.sessions[0]?.id, session.id);
  assert.equal(state.active, session.id);
  assert.equal(state.profileSet, true);
  assert.equal(state.catalogSet, true);
  assert.equal(state.phase, "prepare");
  assert.equal(state.hydrated, false);
  assert.equal(state.error, "");
  assert.ok(commits.indexOf("account") < commits.indexOf("phase"));
});

test("a model catalog failure stays on the fatal screen and does not half-reveal", async () => {
  const { deps, state } = createHarness({
    sessions: [createSession(previewModelCatalog.defaultModelId)],
    io: {
      fetchModelCatalog: async () => { throw new Error("模型列表读取失败"); },
    },
  });
  await runHomeBootstrap(deps, new AbortController().signal);
  assert.equal(state.account, null);
  assert.equal(state.sessions.length, 0);
  assert.equal(state.catalogSet, false);
  assert.equal(state.phase, "");
  assert.equal(state.hydrated, true);
  assert.equal(state.error, "模型列表读取失败");
});

test("a stored pending reservation wins over the global active status", async () => {
  const older = createSession(previewModelCatalog.defaultModelId);
  const pendingSession = createSession(previewModelCatalog.defaultModelId);
  const globalStatus: ConsultationStatus = {
    sessionId: older.id,
    requestId: "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa",
    status: "reserved",
  };
  const storedRequestId = "bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb";
  let restored: { sessionId: string; requestId: string } | null = null;
  const { deps, storage } = createHarness({
    sessions: [older, pendingSession],
    restoreConsultationRecovery: (session, requestId) => {
      restored = { sessionId: session.id, requestId };
    },
    io: {
      fetchActiveConsultationStatus: async () => globalStatus,
      fetchConsultationStatus: async (sessionId, requestId) => ({
        sessionId,
        requestId,
        status: "reserved",
      }),
    },
  });
  storage.setItem(pendingConsultationStorageKey, JSON.stringify({
    sessionId: pendingSession.id,
    requestId: storedRequestId,
    question: "稍后继续",
  }));
  await runHomeBootstrap(deps, new AbortController().signal);
  assert.deepEqual(restored, { sessionId: pendingSession.id, requestId: storedRequestId });
  assert.equal(deps.consultationStatusMissingCount.current, 0);
});

test("a stored 404 still reserves that request and counts the first miss", async () => {
  const session = createSession(previewModelCatalog.defaultModelId);
  const requestId = "cccccccc-cccc-4ccc-8ccc-cccccccccccc";
  let restored: string | null = null;
  const { deps, storage } = createHarness({
    sessions: [session],
    restoreConsultationRecovery: (_session, restoredRequestId) => { restored = restoredRequestId; },
    io: {
      fetchActiveConsultationStatus: async () => null,
      fetchConsultationStatus: async () => { throw new ConsultationStatusError(404, "missing"); },
    },
  });
  storage.setItem(pendingConsultationStorageKey, JSON.stringify({
    sessionId: session.id,
    requestId,
    question: "",
  }));
  await runHomeBootstrap(deps, new AbortController().signal);
  assert.equal(deps.consultationStatusMissingCount.current, 1);
  assert.equal(restored, requestId);
});

test("the slow-network timeout aborts the run and does not enter prepare", async () => {
  installBrowserHosts();
  await withFakeTimers(async (tick) => {
    const { deps, state } = createHarness({
      sessions: [createSession(previewModelCatalog.defaultModelId)],
      io: {
        fetchModelCatalog: (signal) => new Promise((_resolve, reject) => {
          const fail = () => {
            const error = new Error("Aborted");
            error.name = "AbortError";
            reject(error);
          };
          if (signal?.aborted) fail();
          else signal?.addEventListener("abort", fail, { once: true });
        }),
      },
    });
    const pending = runHomeBootstrap(deps, new AbortController().signal);
    await Promise.resolve();
    tick(HOME_BOOTSTRAP_SLOW_MS);
    await pending;
    assert.equal(state.error, HOME_BOOTSTRAP_TIMEOUT_MESSAGE);
    assert.equal(state.hydrated, true);
    assert.equal(state.phase, "");
    assert.equal(state.account, null);
  });
});

test("a login redirect leaves the bootstrap timeout running", async () => {
  installBrowserHosts();
  await withFakeTimers(async (tick) => {
    const { deps, state } = createHarness({
      sessions: [],
      signedOut: true,
      io: {
        redirectToLogin: () => { throw new LoginRedirectError(); },
      },
    });
    await runHomeBootstrap(deps, new AbortController().signal);
    assert.equal(state.error, "");
    assert.equal(state.hydrated, false);
    tick(HOME_BOOTSTRAP_SLOW_MS);
    await Promise.resolve();
    assert.equal(state.error, HOME_BOOTSTRAP_TIMEOUT_MESSAGE);
    assert.equal(state.hydrated, true);
    assert.equal(state.phase, "");
  });
});


test("bootstrap waits for the current provider generation rather than an already settled initial gate", async () => {
  const { deps, state } = createHarness({ sessions: [createSession(previewModelCatalog.defaultModelId)] });
  let release!: () => void;
  deps.waitForSessionList = () => new Promise(resolve => { release = resolve; });
  const pending = runHomeBootstrap(deps, new AbortController().signal);
  await waitUntil(() => Boolean(release));
  assert.equal(state.hydrated, false);
  release();
  await pending;
  assert.equal(state.phase, "prepare");
  assert.equal(state.account?.user.id, "account-1");
  assert.equal(state.error, "");
});

test("a catalog outage is a recoverable bootstrap error, never a login redirect", async () => {
  let redirects = 0;
  const { deps, state } = createHarness({ sessions: [], io: { redirectToLogin: () => { redirects += 1; throw new Error("unexpected login redirect"); } } });
  deps.sessionListBoot = () => ({ sessions: [], rawRows: [], cursor: null, account: null, signedOut: false, error: "session_list_unavailable" });
  await runHomeBootstrap(deps, new AbortController().signal);
  assert.equal(redirects, 0);
  assert.equal(state.hydrated, true);
  assert.notEqual(state.error, "");
});


test("standard new=1 bootstrap creates a conversation bound to the selected person", async () => {
  const { deps, state } = createHarness({ sessions: [], io: {
    resolveLookupBootstrap: async input => ({
      selection: { sessionId: input.defaultSessionId, urlAction: "new-chat", missing: false, clearStoredReturn: false },
      sessions: input.sessions, notice: null,
    }),
    writeSessionUrl: () => {}, clearLoginSessionReturn: () => {},
  } });
  resetSubjectCatalogForTests();
  bindCurrentSubjectAccount("fictional-account", ["fictional-person"]);
  setCurrentSubject("fictional-person");
  deps.readSearch = () => "?new=1";
  try {
    await runHomeBootstrap(deps, new AbortController().signal);
    assert.equal(state.sessions.find(session => session.id === state.active)?.chartProfileId, "fictional-person");
    assert.equal(readCurrentSubjectId(), "fictional-person");
    assert.equal(state.error, "");
  } finally { resetSubjectCatalogForTests(); }
});