// @vitest-environment jsdom
//
// NavigationProvider's URL-derived seeds, backfilling a code review's deferred coverage:
//   • loadInitialPage — the bookmark deep-link precedence (?page > ?v > ?pl > filters/?chan > the
//     account's stored landing page > feed).
//   • channelViewFrom — the shared _chan/?chan resolver behind BOTH the channelView seed and the
//     onPop handler: a popstate landing on a URL-only bookmark entry must restore the
//     channel from ?chan, not close it.
// Only getAccountRaw is stubbed (the page the account left open); everything else is real. Whether
// to start on Home is the account's preference, handed in.
import { describe, it, expect, beforeEach, vi } from "vitest";

const { stored } = vi.hoisted(() => ({ stored: {} as Record<string, string | null> }));
vi.mock("../../lib/storage", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../../lib/storage")>();
  return { ...actual, getAccountRaw: (k: string) => stored[k] ?? null };
});

import { loadInitialPage, channelViewFrom } from "./navigationInit";
import { LS } from "../../lib/storage";

const setUrl = (search: string) => window.history.replaceState(null, "", search || "/");

let startOnHome = true;

beforeEach(() => {
  setUrl("/");
  startOnHome = true;
  for (const k of Object.keys(stored)) delete stored[k];
});

describe("loadInitialPage precedence", () => {
  it("?page wins and is validated", () => {
    setUrl("?page=stats");
    expect(loadInitialPage(startOnHome)).toBe("stats");
  });
  it("an invalid ?page falls back to feed", () => {
    setUrl("?page=bogus");
    expect(loadInitialPage(startOnHome)).toBe("feed");
  });
  it("?v implies the plex module", () => {
    setUrl("?v=show:1");
    expect(loadInitialPage(startOnHome)).toBe("plex");
  });
  it("?pl implies playlists", () => {
    setUrl("?pl=3");
    expect(loadInitialPage(startOnHome)).toBe("playlists");
  });
  it.each(["?folder=4", "?item=12", "?folder=all&item=12"])(
    "%s implies the Files page (a folder, or a file to arrive at)",
    (search) => {
      setUrl(search);
      expect(loadInitialPage(startOnHome)).toBe("files");
    },
  );
  it("a filter param implies the feed", () => {
    setUrl("?tags=1,2");
    expect(loadInitialPage(startOnHome)).toBe("feed");
  });
  it("?chan (the channel overlay) implies the feed", () => {
    setUrl("?chan=UC1");
    expect(loadInitialPage(startOnHome)).toBe("feed");
  });
  it("?page beats a lower-precedence param", () => {
    setUrl("?page=stats&v=show:1");
    expect(loadInitialPage(startOnHome)).toBe("stats");
  });
  it("?v beats ?pl and filters", () => {
    setUrl("?v=show:1&pl=3&tags=1");
    expect(loadInitialPage(startOnHome)).toBe("plex");
  });
  // A bare URL lands on Home, OVER the remembered module. Landing on
  // whatever you happened to close the app on is precisely the habit the anti-paralysis surface
  // exists to replace, so the remembered page only wins once the account opts out.
  it("a bare URL lands on Home even when another module is remembered", () => {
    stored[LS.page] = "plex";
    expect(loadInitialPage(startOnHome)).toBe("home");
  });
  it("opting out restores the account's stored landing page", () => {
    startOnHome = false;
    stored[LS.page] = "plex";
    expect(loadInitialPage(startOnHome)).toBe("plex");
  });
  // The Downloads page is gone; what it held is in Files. A bookmark and a remembered page both land
  // there instead of on the feed.
  it("a retired page lands where its content went — linked or remembered", () => {
    setUrl("?page=downloads");
    expect(loadInitialPage(startOnHome)).toBe("files");
    setUrl("/");
    startOnHome = false;
    stored[LS.page] = "downloads";
    expect(loadInitialPage(startOnHome)).toBe("files");
  });
  it("opted out with no / invalid stored page still defaults to feed", () => {
    startOnHome = false;
    expect(loadInitialPage(startOnHome)).toBe("feed");
    stored[LS.page] = "nope";
    expect(loadInitialPage(startOnHome)).toBe("feed");
  });
  it("a deep link still beats Home", () => {
    setUrl("?pl=3");
    expect(loadInitialPage(startOnHome)).toBe("playlists");
  });
});

describe("channelViewFrom", () => {
  it("reads _chan (+ _chanName) from an in-app entry", () => {
    expect(channelViewFrom({ _chan: "UC1", _chanName: "Chan" }, "")).toEqual({
      id: "UC1",
      name: "Chan",
    });
  });
  it("_chan without a name yields an undefined name", () => {
    expect(channelViewFrom({ _chan: "UC1" }, "")).toEqual({ id: "UC1", name: undefined });
  });
  it("falls back to the ?chan URL param when the entry has no _chan (fresh bookmark)", () => {
    expect(channelViewFrom(null, "?chan=UC9")).toEqual({ id: "UC9", name: undefined });
  });
  it("prefers _chan over the URL param", () => {
    expect(channelViewFrom({ _chan: "UCstate" }, "?chan=UCurl")).toEqual({
      id: "UCstate",
      name: undefined,
    });
  });
  it("returns null when neither is present (channel closed)", () => {
    expect(channelViewFrom({}, "")).toBeNull();
    expect(channelViewFrom(null, "/")).toBeNull();
  });
});