// @vitest-environment jsdom
import { describe, expect, it } from "vitest";
import { EMPTY_PLEX_FILTERS, type PlexFilters } from "./api";
import { PLEX_SORT_FALLBACK } from "./plexSort";
import {
  hasPlexParams,
  plexParamsToState,
  plexParamUpdates,
  type PlexUrlState,
} from "./plexUrlState";

// A concrete non-default filter set exercising every wire shape (csv arrays, scalars, modes).
const RICH_FILTERS: PlexFilters = {
  genres: ["Drama", "Comedy"],
  genreMode: "all",
  contentRatings: ["PG-13"],
  yearMin: 2000,
  yearMax: 2020,
  ratingMin: 7,
  durationMin: 600,
  durationMax: 7200,
  addedWithin: "1m",
  directors: ["Nolan"],
  actors: ["Bale", "Caine"],
  actorMode: "all",
  studios: ["Warner"],
  playable: ["direct", "transcode_hw"],
  keywords: ["heist"],
  collections: ["1234"],
  collectionMode: "all",
  collectionTitles: { "1234": "Marvel" },
};

// Apply an updates delta onto a base URLSearchParams the way urlWithParams would (null deletes).
function applyUpdates(updates: Record<string, string | null>): URLSearchParams {
  const p = new URLSearchParams();
  for (const [k, v] of Object.entries(updates)) {
    if (v != null) p.set(k, v);
  }
  return p;
}

const BASE: PlexUrlState = {
  scope: "both",
  sort: PLEX_SORT_FALLBACK,
  show: "all",
  filters: EMPTY_PLEX_FILTERS,
};

describe("plexParamUpdates", () => {
  it("writes the default view in full: this account remembers one a link must not inherit", () => {
    expect(plexParamUpdates(BASE)).toEqual({
      pscope: "both",
      psort: "title:asc",
      pshow: "all",
      pf: "",
    });
  });

  it("writes an unsorted view as such, so a link to it is not sorted by the remembered sort", () => {
    const unsorted = { ...BASE, sort: null };
    expect(plexParamUpdates(unsorted).psort).toBe("none");
    const back = plexParamsToState(applyUpdates(plexParamUpdates(unsorted)), {
      ...BASE,
      sort: { key: "year", dir: "desc" },
    });
    expect(back?.sort).toBeNull();
  });

  it("a link to the default view opens it over another remembered one", () => {
    const params = applyUpdates(plexParamUpdates(BASE));
    const back = plexParamsToState(params, {
      scope: "movie",
      sort: { key: "year", dir: "desc" },
      show: "watched",
      filters: RICH_FILTERS,
    });
    expect(back).toEqual(BASE);
  });

  it("clears every key when passed null (off-plex page)", () => {
    expect(plexParamUpdates(null)).toEqual({
      pscope: null,
      psort: null,
      pshow: null,
      pf: null,
    });
  });

  it("writes the view picked", () => {
    const u = plexParamUpdates({
      scope: "movie",
      sort: { key: "year", dir: "desc" },
      show: "in_progress",
      filters: EMPTY_PLEX_FILTERS,
    });
    expect(u.pscope).toBe("movie");
    expect(u.psort).toBe("year:desc");
    expect(u.pshow).toBe("in_progress");
    expect(u.pf).toBe("");
  });
});

describe("round-trip", () => {
  it("restores a rich state from the emitted URL", () => {
    const state: PlexUrlState = {
      scope: "show",
      sort: { key: "rating", dir: "desc" },
      show: "watched",
      filters: RICH_FILTERS,
    };
    const params = applyUpdates(plexParamUpdates(state));
    const back = plexParamsToState(params, BASE);
    expect(back.scope).toBe("show");
    expect(back.sort).toEqual({ key: "rating", dir: "desc" });
    expect(back.show).toBe("watched");
    // collectionTitles is display-only (excluded from the wire), so compare the rest.
    const { collectionTitles: _drop, ...wire } = RICH_FILTERS;
    expect(back.filters).toEqual(wire);
  });

  it("keeps base values for absent keys (partial link)", () => {
    const params = new URLSearchParams("psort=year:asc");
    const back = plexParamsToState(params, {
      scope: "movie",
      sort: PLEX_SORT_FALLBACK,
      show: "unwatched",
      filters: EMPTY_PLEX_FILTERS,
    });
    expect(back.scope).toBe("movie"); // from base, no pscope
    expect(back.show).toBe("unwatched"); // from base, no pshow
    expect(back.sort).toEqual({ key: "year", dir: "asc" });
  });

  it("ignores an out-of-vocabulary scope/show/sort and falls back to base", () => {
    const params = new URLSearchParams("pscope=bogus&pshow=nope&psort=key:sideways");
    const back = plexParamsToState(params, BASE);
    expect(back.scope).toBe("both");
    expect(back.show).toBe("all");
    expect(back.sort).toEqual(PLEX_SORT_FALLBACK); // bad dir → parseSortState null → base
  });
});

describe("hasPlexParams", () => {
  it("detects any namespaced key", () => {
    expect(hasPlexParams(new URLSearchParams("pf=genres%3DDrama"))).toBe(true);
    expect(hasPlexParams(new URLSearchParams("pscope=movie"))).toBe(true);
  });
  it("ignores the feed's bare keys", () => {
    expect(hasPlexParams(new URLSearchParams("scope=all&sort=oldest&show=watched"))).toBe(false);
  });
});