import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";
import {
  defaultSidebarOpen,
  readStoredSidebarOpen,
  shouldHandleSidebarShortcut,
  sidebarViewportForWidth,
  writeStoredSidebarOpen,
} from "../src/lib/sidebar-state.ts";
import { beginSessionPageLoad, mergeSessionPage } from "../src/lib/session-groups.ts";
import { homeSurface } from "./home-surface.ts";

test("classifies the exact sidebar breakpoints", () => {
  assert.equal(sidebarViewportForWidth(0), "mobile");
  assert.equal(sidebarViewportForWidth(767), "mobile");
  assert.equal(sidebarViewportForWidth(768), "tablet");
  assert.equal(sidebarViewportForWidth(1023), "tablet");
  assert.equal(sidebarViewportForWidth(1024), "desktop");
});

test("uses the approved reload defaults", () => {
  assert.equal(defaultSidebarOpen("mobile"), false);
  assert.equal(defaultSidebarOpen("tablet"), false);
  assert.equal(defaultSidebarOpen("desktop"), true);
});

test("accepts Command or Control B only outside editable controls", () => {
  const shortcut = { key: "b", metaKey: true, ctrlKey: false, altKey: false, shiftKey: false };

  assert.equal(shouldHandleSidebarShortcut({ ...shortcut, target: null }), true);
  assert.equal(shouldHandleSidebarShortcut({ ...shortcut, target: { tagName: "TEXTAREA" } }), false);
  assert.equal(shouldHandleSidebarShortcut({ ...shortcut, target: { isContentEditable: true } }), false);
  assert.equal(shouldHandleSidebarShortcut({ ...shortcut, key: "k", target: null }), false);
});

test("renaming a session does not bump updatedAt", () => {
  assert.match(homeSurface, /const nextSession = \{ \.\.\.session, title \};/);
  assert.doesNotMatch(homeSurface, /const nextSession = \{ \.\.\.session, title, updatedAt: timestamp\(\) \};/);
});

test("loadMoreSessions merges by id and only starts one in-flight request", () => {
  const inFlight = { current: false };
  assert.equal(beginSessionPageLoad(inFlight, "cursor-1"), true);
  assert.equal(beginSessionPageLoad(inFlight, "cursor-1"), false);
  const merged = mergeSessionPage(
    [{ id: "keep", updatedAt: 900 }],
    [{ id: "keep", updatedAt: 1 }, { id: "next", updatedAt: 2 }],
  );
  assert.deepEqual(merged.map((item) => item.id), ["keep", "next"]);
  assert.equal(merged[0]?.updatedAt, 900);
});

/* T5 · the collapse state is remembered across pages (TASK-sidebar-unify D5).
   localStorage, not the shadcn `sidebar_state` cookie: `/`, `/chart` and
   `/ephemeris` are all static routes, and reading a cookie on the server would
   opt every one of them out of static rendering. */

function fakeStorage(initial?: string) {
  let value = initial;
  return {
    getItem: () => value ?? null,
    setItem: (_key: string, next: string) => { value = next; },
    read: () => value,
  };
}

test("a collapsed desktop sidebar is still collapsed after a remount", () => {
  const storage = fakeStorage();

  writeStoredSidebarOpen("desktop", false, storage);
  assert.equal(storage.read(), "false");

  // What SidebarProvider resolves on the next page: stored wins over the
  // breakpoint default, which for desktop would have been `true`.
  assert.equal(readStoredSidebarOpen("desktop", storage) ?? defaultSidebarOpen("desktop"), false);

  writeStoredSidebarOpen("desktop", true, storage);
  assert.equal(readStoredSidebarOpen("desktop", storage) ?? defaultSidebarOpen("desktop"), true);

  // Nothing stored, or something unreadable: the breakpoint default stands.
  const empty = fakeStorage();
  assert.equal(readStoredSidebarOpen("desktop", empty), null);
  assert.equal(readStoredSidebarOpen("tablet", fakeStorage("banana")), null);
  assert.equal(readStoredSidebarOpen("tablet", empty) ?? defaultSidebarOpen("tablet"), false);
});

test("the mobile drawer is not remembered, read or written", () => {
  // Reopening a phone drawer on every navigation is not a preference anyone set.
  const storage = fakeStorage();
  writeStoredSidebarOpen("mobile", true, storage);
  assert.equal(storage.read(), undefined);
  assert.equal(readStoredSidebarOpen("mobile", fakeStorage("true")), null);
  assert.equal(readStoredSidebarOpen("mobile", fakeStorage("true")) ?? defaultSidebarOpen("mobile"), false);

  // Unavailable storage (private mode, blocked site data) degrades, never throws.
  assert.equal(readStoredSidebarOpen("desktop", null), null);
  assert.doesNotThrow(() => writeStoredSidebarOpen("desktop", true, null));

  // And the provider applies it in the same effect that applied the breakpoint
  // default, so a stored value costs no frame the default did not already cost.
  const provider = readFileSync(new URL("../src/components/ui/sidebar.tsx", import.meta.url), "utf8");
  assert.match(provider, /readStoredSidebarOpen\(viewport\) \?\? defaultSidebarOpen\(viewport\)/);
  assert.match(provider, /writeStoredSidebarOpen\(viewport, nextOpen\)/);
});