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

import {
  SIDEBAR_CACHE_TTL_MS,
  invalidateSidebarCache,
  readSidebarCache,
  sidebarCacheIsFresh,
  writeSidebarCache,
} from "../src/lib/sidebar-data-cache.ts";

const hookSource = readFileSync(new URL("../src/hooks/use-sidebar-data.ts", import.meta.url), "utf8");
const sessionHookSource = readFileSync(new URL("../src/hooks/use-session-management.ts", import.meta.url), "utf8");

const row = (id: string, title: string) => ({
  id,
  title,
  pinned: false,
  archived: false,
  updatedAt: 1,
});

const account = {
  name: "示例账户",
  email: "example@invalid.test",
  credits: 0,
  initial: "示",
  avatar: null,
};

test("the read-only sidebar reuses a fresh entry instead of fetching again", () => {
  invalidateSidebarCache();
  assert.equal(readSidebarCache(), null);

  writeSidebarCache({ accountId: "acct-1", sessions: [row("a", "第一条")], account, fetchedAt: 1_000 });
  const entry = readSidebarCache();
  assert.ok(entry);
  assert.equal(entry.sessions[0]?.title, "第一条");

  // Inside the window: the hook returns without touching the network.
  assert.equal(sidebarCacheIsFresh(entry, 1_000), true);
  assert.equal(sidebarCacheIsFresh(entry, 1_000 + SIDEBAR_CACHE_TTL_MS - 1), true);

  // Past it: shown from cache first, refreshed in the background — exactly one
  // refetch, because the write that follows resets `fetchedAt`.
  assert.equal(sidebarCacheIsFresh(entry, 1_000 + SIDEBAR_CACHE_TTL_MS), false);
  assert.equal(sidebarCacheIsFresh(entry, 60_000_000), false);
  assert.equal(sidebarCacheIsFresh(null, 1_000), false);

  // A clock that jumped backwards must not read as fresh forever.
  assert.equal(sidebarCacheIsFresh(entry, 0), false);
});

test("a session write on `/` makes the next secondary page read the new title", () => {
  invalidateSidebarCache();
  writeSidebarCache({ accountId: "acct-1", sessions: [row("a", "旧标题")], account, fetchedAt: 1_000 });
  assert.equal(readSidebarCache()?.sessions[0]?.title, "旧标题");

  invalidateSidebarCache();
  assert.equal(readSidebarCache(), null);
  assert.equal(sidebarCacheIsFresh(readSidebarCache(), 1_001), false);

  // Every write path on `/` calls it: create, rename, delete, pin, archive.
  for (const marker of [
    /await persistSession\(nextSession\);\n\s*\/\*[\s\S]*?\*\/\n\s*invalidateSidebarCache\(\);/,
    /删除聊天记录失败"\);\n\s*invalidateSidebarCache\(\);/,
    /\{ pinned: nextPinned \}, "update"\)\.then\(invalidateSidebarCache\)/,
    /\{ archived_at: nextArchivedAt \}, "update"\)\.then\(invalidateSidebarCache\)/,
    /\);\n\s*invalidateSidebarCache\(\);\n\s*return nextSession;/,
  ]) {
    assert.match(sessionHookSource, marker);
  }
});

test("a second account in the same tab never reads the first one's rows", () => {
  invalidateSidebarCache();
  writeSidebarCache({ accountId: "acct-1", sessions: [row("a", "甲的对话")], account, fetchedAt: 1_000 });
  writeSidebarCache({ accountId: "acct-2", sessions: [row("b", "乙的对话")], account, fetchedAt: 2_000 });

  assert.equal(readSidebarCache()?.accountId, "acct-2");
  assert.equal(readSidebarCache()?.sessions[0]?.title, "乙的对话");
  invalidateSidebarCache();
});

test("the cache is memory only, and a 401 empties it", () => {
  // Nothing durable: a stale list surviving a browser restart is worse than one
  // fetch, and it would outlive a sign-out.
  const cacheSource = readFileSync(new URL("../src/lib/sidebar-data-cache.ts", import.meta.url), "utf8");
  assert.doesNotMatch(cacheSource, /localStorage|sessionStorage|document\.cookie|indexedDB/i);

  assert.match(hookSource, /if \(sidebarCacheIsFresh\(cached, Date\.now\(\)\)\) return;/);
  assert.match(hookSource, /invalidateSidebarCache\(\);\n\s*setState\(\{ sessions: \[\], account: null, settled: true, signedOut: true \}\);/);

  // Read synchronously at mount so a cached list is on screen in the first
  // frame — no skeleton, no spinner, per the unified-loading ruling.
  assert.match(hookSource, /useState<SidebarDataState>\(\(\) => \{[\s\S]*?readSidebarCache\(\)/);
  assert.doesNotMatch(hookSource, /skeleton|Spinner/i);
});