// PLEX_SUB_URL encode/decode round-trip + guards. Extracted from PlexBrowse for this test (a
// code review's deferred gap). Pure — no DOM, no history.
import { describe, it, expect } from "vitest";
import { PLEX_SUB_URL as U, type Sub } from "./plexSubUrl";

describe("PLEX_SUB_URL encode", () => {
  it("mirrors each bookmarkable sub-view to ?v=<kind>:<args>", () => {
    expect(U.encode({ kind: "grid" })).toBe("browse"); // the flat "Browse all" grid
    expect(U.encode({ kind: "playlists" })).toBe("playlists"); // browse-all-playlists (Piece 2)
    expect(U.encode({ kind: "collections" })).toBe("collections"); // browse-all-collections (Piece 2)
    expect(U.encode({ kind: "show", id: "s1" })).toBe("show:s1");
    expect(U.encode({ kind: "season", showId: "s1", seasonId: "se2" })).toBe("season:s1:se2");
    expect(U.encode({ kind: "info", id: "m9" })).toBe("info:m9");
    expect(U.encode({ kind: "person", name: "Jane Doe" })).toBe("person:Jane Doe");
    expect(U.encode({ kind: "playlist", id: 12 })).toBe("playlist:12");
    expect(U.encode({ kind: "collection", id: "c5" })).toBe("collection:c5");
  });

  it("does NOT mirror the root Discover landing or the ephemeral player (encode → null)", () => {
    expect(U.encode({ kind: "discover" })).toBeNull();
    expect(U.encode({ kind: "player", id: "m9" })).toBeNull();
  });
});

describe("PLEX_SUB_URL round-trip", () => {
  const cases: Sub[] = [
    { kind: "grid" },
    { kind: "playlists" },
    { kind: "collections" },
    { kind: "show", id: "s1" },
    { kind: "season", showId: "s1", seasonId: "se2" },
    { kind: "info", id: "m9" },
    { kind: "person", name: "Jane Doe" },
    { kind: "playlist", id: 12 },
    { kind: "collection", id: "c5" },
  ];
  it.each(cases)("encode→decode is identity for %o", (view) => {
    const raw = U.encode(view);
    expect(raw).not.toBeNull();
    expect(U.decode(raw as string)).toEqual(view);
  });

  it("a person name containing ':' round-trips (tail after the first colon)", () => {
    const view: Sub = { kind: "person", name: "Dr: Strange: Origins" };
    expect(U.decode(U.encode(view) as string)).toEqual(view);
  });
});

describe("PLEX_SUB_URL decode guards", () => {
  it("rejects a playlist id that is not a positive integer", () => {
    expect(U.decode("playlist:")).toBeNull(); // Number("")===0, not >0
    expect(U.decode("playlist:0")).toBeNull();
    expect(U.decode("playlist:-1")).toBeNull();
    expect(U.decode("playlist:1.5")).toBeNull();
    expect(U.decode("playlist:abc")).toBeNull();
    expect(U.decode("playlist:12")).toEqual({ kind: "playlist", id: 12 });
  });

  it("requires both ids for a season", () => {
    expect(U.decode("season:s1")).toBeNull();
    expect(U.decode("season:")).toBeNull();
    expect(U.decode("season:s1:se2")).toEqual({ kind: "season", showId: "s1", seasonId: "se2" });
  });

  it("requires a non-empty arg for show / info / person / collection", () => {
    expect(U.decode("show:")).toBeNull();
    expect(U.decode("info:")).toBeNull();
    expect(U.decode("person:")).toBeNull();
    expect(U.decode("collection:")).toBeNull();
  });

  it("rejects an unknown kind or garbage", () => {
    expect(U.decode("grid")).toBeNull();
    expect(U.decode("player:m9")).toBeNull(); // player is not URL-restorable
    expect(U.decode("bogus")).toBeNull();
    expect(U.decode("")).toBeNull();
  });
});

describe("PLEX_SUB_URL entry", () => {
  // The Restart click must not replay on a reload / Forward onto the player entry.
  it("keeps the player without its one-shot fromStart, and every other view whole", () => {
    const entry = U.entry!;
    expect(entry({ kind: "player", id: "7", queue: ["7", "8"], fromStart: true })).toEqual({
      kind: "player",
      id: "7",
      queue: ["7", "8"],
      fromStart: undefined,
    });
    const info = { kind: "info", id: "7" } as const;
    expect(entry(info)).toBe(info);
  });
});