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

import {
  SESSION_MISSING_NOTICE,
  SESSION_URL_QUERY_KEY,
  SESSION_URL_RETURN_STORAGE_KEY,
  parseSessionUrlQuery,
  persistLoginSessionReturn,
  readLoginSessionReturn,
  resolveBootstrapSessionSelection,
  sessionHref,
  writeSessionUrl,
} from "../src/lib/chat-session-url.ts";

import { homeSurface as page } from "./home-surface.ts";
const login = readFileSync(new URL("../src/components/email-otp-login.tsx", import.meta.url), "utf8");
const loginPage = readFileSync(new URL("../src/app/login/page.tsx", import.meta.url), "utf8");
const sessionA = "11111111-1111-4111-8111-111111111111";
const sessionB = "22222222-2222-4222-8222-222222222222";
const sessionC = "33333333-3333-4333-8333-333333333333";

function sourceBetween(source: string, startMarker: string, endMarker: string) {
  const start = source.indexOf(startMarker);
  const end = source.indexOf(endMarker, start);
  assert.notEqual(start, -1, startMarker);
  assert.notEqual(end, -1, endMarker);
  return source.slice(start, end);
}

test("bootstrap reads a listed ?c= session and ignores login storage", () => {
  assert.deepEqual(
    resolveBootstrapSessionSelection({
      listedIds: [sessionA, sessionB],
      defaultSessionId: sessionA,
      search: `?${SESSION_URL_QUERY_KEY}=${sessionB}`,
      storedReturnId: sessionC,
    }),
    {
      sessionId: sessionB,
      urlAction: "keep",
      missing: false,
      clearStoredReturn: true,
    },
  );
});

test("bootstrap restores a stored login return only when the URL has no c", () => {
  assert.deepEqual(
    resolveBootstrapSessionSelection({
      listedIds: [sessionA, sessionB],
      defaultSessionId: sessionA,
      search: "",
      storedReturnId: sessionB,
    }),
    {
      sessionId: sessionB,
      urlAction: "replace-selected",
      missing: false,
      clearStoredReturn: true,
    },
  );
});

test("bootstrap clears an illegal or unknown session query", () => {
  assert.equal(parseSessionUrlQuery("").present, false);
  assert.deepEqual(parseSessionUrlQuery(`?${SESSION_URL_QUERY_KEY}=not-a-uuid`), {
    present: true,
    sessionId: null,
  });
  assert.deepEqual(
    resolveBootstrapSessionSelection({
      listedIds: [sessionA],
      defaultSessionId: sessionA,
      search: `?${SESSION_URL_QUERY_KEY}=not-a-uuid`,
      storedReturnId: sessionB,
    }),
    {
      sessionId: sessionA,
      urlAction: "replace-clear",
      missing: true,
      clearStoredReturn: true,
    },
  );
  assert.deepEqual(
    resolveBootstrapSessionSelection({
      listedIds: [sessionA],
      defaultSessionId: sessionA,
      search: `?${SESSION_URL_QUERY_KEY}=${sessionB}`,
      storedReturnId: null,
    }),
    {
      sessionId: sessionA,
      urlAction: "replace-clear",
      missing: true,
      clearStoredReturn: true,
    },
  );
});

test("default bootstrap selection does not write a session URL", () => {
  assert.deepEqual(
    resolveBootstrapSessionSelection({
      listedIds: [sessionA, sessionB],
      defaultSessionId: sessionA,
      search: "",
      storedReturnId: null,
    }),
    {
      sessionId: sessionA,
      urlAction: "none",
      missing: false,
      clearStoredReturn: false,
    },
  );

  const bootstrap = sourceBetween(page, "async function loadCloudData()", "void loadCloudData();");
  assert.match(bootstrap, /defaultSessionId: nextSessions\[0\]\.id/);
  assert.match(bootstrap, /setActiveSessionId\(bootstrapSelection\.sessionId\)/);
  assert.match(bootstrap, /urlAction === "replace-clear"/);
  assert.match(bootstrap, /urlAction === "replace-selected"/);
  assert.doesNotMatch(bootstrap, /writeSessionUrl\([^)]*, "push"\)/);
  assert.match(bootstrap, /setComposerNotice\(SESSION_MISSING_NOTICE\)/);
});

test("session href keeps sibling query keys and can drop a dead c", () => {
  assert.equal(sessionHref("", sessionA), `/?${SESSION_URL_QUERY_KEY}=${sessionA}`);
  assert.equal(
    sessionHref("?preview=conversation", sessionA),
    `/?preview=conversation&${SESSION_URL_QUERY_KEY}=${sessionA}`,
  );
  assert.equal(sessionHref(`?${SESSION_URL_QUERY_KEY}=${sessionA}`, null), "/");
  assert.equal(
    sessionHref(`?preview=conversation&${SESSION_URL_QUERY_KEY}=${sessionA}`, null),
    "/?preview=conversation",
  );
});

test("user session switches push history; popstate reuses selectSession without a second push", () => {
  const selectSession = sourceBetween(
    page,
    "function selectSession(sessionId: string)",
    "async function selectSessionModel",
  );
  assert.match(selectSession, /sessionSelectionSource\.current === "user"/);
  assert.match(selectSession, /writeSessionUrl\(sessionId, "push"\)/);
  assert.match(selectSession, /sessionSelectionSource\.current = "history";\n    selectSession\(/);
  assert.equal((selectSession.match(/writeSessionUrl\([^)]*, "push"\)/g) ?? []).length, 1);
  assert.match(page, /window\.addEventListener\("popstate", onPopState\)/);
});

test("popstate to a missing session query reuses selectSession side effects for the default chat", () => {
  const pop = sourceBetween(
    page,
    "applySessionPopStateRef.current =",
    "async function selectSessionModel",
  );
  // Former empty-id branch: `if (!requestedId) { setActiveSessionId(""); return; }`
  // Back to `/` with a listed chat now runs the same selectSession side effects
  // as a sidebar click, still tagged history so it does not push a second URL.
  assert.match(
    pop,
    /if \(!requestedId\) \{\n      if \(fallbackId\) \{\n        sessionSelectionSource\.current = "history";\n        selectSession\(fallbackId\);\n      \} else \{\n        setActiveSessionId\(""\);\n      \}\n      return;/,
  );
  assert.equal((pop.match(/writeSessionUrl\([^)]*, "push"\)/g) ?? []).length, 0);
});

test("creating and leaving a session keep the address bar in sync", () => {
  const startNewChat = sourceBetween(page, "async function startNewChat()", "function selectSession(");
  assert.match(startNewChat, /writeSessionUrl\(nextSession\.id, "push"\)/);
  assert.match(startNewChat, /window\.history\.replaceState\(null, "", previousHref\)/);

  const deleteSession = sourceBetween(page, "async function deleteSession(", "function togglePinnedSession");
  assert.match(deleteSession, /writeSessionUrl\(fallbackId \|\| null, "replace"\)/);

  const archiveSession = sourceBetween(page, "function toggleArchivedSession(", "async function shareSession");
  assert.match(archiveSession, /writeSessionUrl\(fallbackId \|\| null, "replace"\)/);

  const recovery = sourceBetween(
    page,
    "if (status.status === \"completed\") {",
    "pendingConsultation.current = null;",
  );
  assert.match(recovery, /setActiveSessionId\(\(current\) => current \|\| detailed\.id\)/);
  assert.doesNotMatch(recovery, /writeSessionUrl/);
});

test("401 login redirect stashes the current session id without changing the login page", () => {
  const redirect = sourceBetween(page, "function redirectToLogin(): never {", "function waitForUndoWindow");
  // Former value: the body was only `window.location.replace("/login")`.
  // 401 now stashes a UUID ?c= so returning to `/` can restore the session
  // without adding a `next` query to the login page.
  assert.match(redirect, /persistLoginSessionReturn\(\);/);
  assert.match(redirect, /window\.location\.replace\("\/login"\);/);
  assert.doesNotMatch(login, /sessionStorage|SESSION_URL_RETURN|searchParams\.get\("next"\)/);
  assert.match(login, /successPath\?: "\/" \| "\/admin"/);
  assert.doesNotMatch(loginPage, /next=/);
  assert.equal(SESSION_URL_RETURN_STORAGE_KEY, "jyotisha.session-url-return");
});

test("home stays a client-read query on a static route", () => {
  const lib = readFileSync(new URL("../src/lib/chat-session-url.ts", import.meta.url), "utf8");
  assert.doesNotMatch(page, /useSearchParams/);
  assert.doesNotMatch(page, /export const dynamic/);
  assert.match(page, /writeSessionUrl\(sessionId, "push"\)/);
  assert.match(page, /window\.history\.replaceState/);
  assert.match(lib, /history\.pushState\(null, "", next\)/);
  assert.match(lib, /history\.replaceState\(null, "", next\)/);
  const preview = sourceBetween(
    page,
    "if (previewMode) {",
    "const [nextAccount, modelCatalogResult, sessionsPayload]",
  );
  assert.doesNotMatch(preview, /writeSessionUrl|persistLoginSessionReturn|readLoginSessionReturn/);
  assert.match(page, /SESSION_MISSING_NOTICE/);
  assert.equal(SESSION_MISSING_NOTICE, "该对话不存在或已被删除");
});

test("login return storage only accepts a UUID session id", () => {
  const memory = new Map<string, string>();
  const previousWindow = globalThis.window;
  Object.defineProperty(globalThis, "window", {
    configurable: true,
    value: {
      location: { search: `?${SESSION_URL_QUERY_KEY}=${sessionA}` },
    },
  });
  Object.defineProperty(globalThis, "sessionStorage", {
    configurable: true,
    value: {
      setItem(key: string, value: string) { memory.set(key, value); },
      getItem(key: string) { return memory.get(key) ?? null; },
      removeItem(key: string) { memory.delete(key); },
    },
  });
  try {
    persistLoginSessionReturn();
    assert.equal(readLoginSessionReturn(), sessionA);
    memory.set(SESSION_URL_RETURN_STORAGE_KEY, "not-a-uuid");
    assert.equal(readLoginSessionReturn(), null);
  } finally {
    if (previousWindow === undefined) {
      Reflect.deleteProperty(globalThis, "window");
    } else {
      Object.defineProperty(globalThis, "window", { configurable: true, value: previousWindow });
    }
    Reflect.deleteProperty(globalThis, "sessionStorage");
  }
});

test("writeSessionUrl no-ops when the address is already the target", () => {
  const calls: string[] = [];
  const previousWindow = globalThis.window;
  Object.defineProperty(globalThis, "window", {
    configurable: true,
    value: {
      location: { pathname: "/", search: `?${SESSION_URL_QUERY_KEY}=${sessionA}` },
      history: {
        pushState(_state: unknown, _unused: string, url: string) { calls.push(`push:${url}`); },
        replaceState(_state: unknown, _unused: string, url: string) { calls.push(`replace:${url}`); },
      },
    },
  });
  try {
    writeSessionUrl(sessionA, "push");
    assert.deepEqual(calls, []);
    writeSessionUrl(sessionB, "push");
    assert.deepEqual(calls, [`push:/?${SESSION_URL_QUERY_KEY}=${sessionB}`]);
    writeSessionUrl(null, "replace");
    assert.deepEqual(calls, [
      `push:/?${SESSION_URL_QUERY_KEY}=${sessionB}`,
      "replace:/",
    ]);
  } finally {
    if (previousWindow === undefined) {
      Reflect.deleteProperty(globalThis, "window");
    } else {
      Object.defineProperty(globalThis, "window", { configurable: true, value: previousWindow });
    }
  }
});