// @vitest-environment jsdom
//
// The address-bar helpers that back the URL model: urlWithParams (read-modify-write on the live query so
// each provider owns its own key without clobbering the others), clearParams (strip only transient
// auth/one-time keys, never the nav/filter ones), and filterParamUpdates (feed filters → set/delete
// delta, or clear-all). The round-trip through filtersToParams/paramsToFilters is exercised too.
import { describe, it, expect, beforeEach } from "vitest";
import {
  urlWithParams,
  clearParams,
  filterParamUpdates,
  filtersToParams,
  paramsToFilters,
} from "./urlState";
import { DEFAULT_TAG_MODES, type FeedFilters } from "./api";

function setLocation(search: string) {
  window.history.replaceState(null, "", `/app${search}`);
}
function queryOf(url: string): URLSearchParams {
  return new URLSearchParams(url.includes("?") ? url.slice(url.indexOf("?") + 1) : "");
}

const DEFAULTS: FeedFilters = {
  tags: [],
  tagModes: DEFAULT_TAG_MODES,
  channelIds: [],
  q: "",
  sort: "newest",
  scope: "my",
  includeNormal: true,
  includeShorts: false,
  includeLive: false,
  show: "unwatched",
};

describe("urlWithParams", () => {
  beforeEach(() => setLocation(""));

  it("sets a key while preserving the pathname and existing params", () => {
    setLocation("?page=plex");
    const url = urlWithParams({ v: "show:1" });
    expect(url.startsWith("/app?")).toBe(true);
    const q = queryOf(url);
    expect(q.get("v")).toBe("show:1");
    expect(q.get("page")).toBe("plex"); // untouched
  });

  it("deletes a key on a null value and leaves the others", () => {
    setLocation("?page=plex&v=show:1&q=react");
    const q = queryOf(urlWithParams({ v: null }));
    expect(q.has("v")).toBe(false);
    expect(q.get("page")).toBe("plex");
    expect(q.get("q")).toBe("react");
  });

  it("applies a mix of sets and deletes in one call", () => {
    setLocation("?page=plex&v=show:1&chan=UC1");
    const q = queryOf(urlWithParams({ page: null, chan: null, v: null, pl: null }));
    expect([...q.keys()]).toEqual([]); // page switch resets the view-specific keys
  });

  it("returns a bare path when the query empties out", () => {
    setLocation("?page=channels");
    expect(urlWithParams({ page: null })).toBe("/app");
  });
});

describe("clearParams", () => {
  beforeEach(() => setLocation(""));

  it("removes only the named transient keys, keeping nav/filter params", () => {
    setLocation("?link=ok&page=plex&v=show:1&q=react");
    clearParams("link", "oauth", "admin", "access", "verify", "reset");
    const q = new URLSearchParams(window.location.search);
    expect(q.has("link")).toBe(false);
    expect(q.get("page")).toBe("plex");
    expect(q.get("v")).toBe("show:1");
    expect(q.get("q")).toBe("react");
  });

  it("is a no-op (no history write) when none of the keys are present", () => {
    setLocation("?page=plex");
    const before = window.location.search;
    clearParams("link", "oauth");
    expect(window.location.search).toBe(before);
  });
});

describe("filterParamUpdates", () => {
  it("maps non-default filters to values and defaults to null (delete)", () => {
    const f: FeedFilters = { ...DEFAULTS, q: "react", tags: [3, 7], show: "watched" };
    const upd = filterParamUpdates(f);
    expect(upd.q).toBe("react");
    expect(upd.tags).toBe("3,7");
    expect(upd.show).toBe("watched");
    expect(upd.sort).toBeNull(); // default "newest" is not emitted → cleared
    expect(upd.scope).toBeNull();
  });

  it("clears ALL filter keys when passed null (leaving the feed)", () => {
    const upd = filterParamUpdates(null);
    for (const v of Object.values(upd)) expect(v).toBeNull();
    // includes every recognized filter key
    expect(Object.keys(upd)).toEqual(
      expect.arrayContaining(["q", "tags", "show", "sort", "scope"]),
    );
  });

  it("round-trips through the URL (filters → params → filters)", () => {
    const f: FeedFilters = {
      ...DEFAULTS,
      q: "hi",
      tags: [1, 2],
      scope: "all",
      includeShorts: true,
    };
    const back = paramsToFilters(filtersToParams(f), DEFAULTS);
    expect(back.q).toBe("hi");
    expect(back.tags).toEqual([1, 2]);
    expect(back.scope).toBe("all");
    expect(back.includeShorts).toBe(true);
  });

  it("round-trips per-category tag modes (only 'and' is emitted)", () => {
    const f: FeedFilters = {
      ...DEFAULTS,
      tags: [1, 2],
      tagModes: { language: "and", topic: "and", other: "or" },
    };
    const params = filtersToParams(f);
    expect(params.get("tagmode_language")).toBe("and");
    expect(params.get("tagmode_topic")).toBe("and");
    expect(params.has("tagmode_other")).toBe(false); // 'or' is the default, not emitted
    const back = paramsToFilters(params, DEFAULTS);
    expect(back.tagModes).toEqual({ language: "and", topic: "and", other: "or" });
  });

  it("migrates a legacy global ?tagmode=and into the topic slot only", () => {
    const back = paramsToFilters(new URLSearchParams("tagmode=and"), DEFAULTS);
    expect(back.tagModes).toEqual({ language: "or", topic: "and", other: "or" });
  });

  it("round-trips the 'No tag' (untagged) flag; emitted only when on", () => {
    expect(filtersToParams({ ...DEFAULTS, untagged: true }).get("notag")).toBe("1");
    expect(filtersToParams({ ...DEFAULTS, untagged: false }).has("notag")).toBe(false);
    expect(paramsToFilters(new URLSearchParams("notag=1"), DEFAULTS).untagged).toBe(true);
    // Absent → the base value is left untouched (undefined here, i.e. off).
    expect(paramsToFilters(new URLSearchParams(""), DEFAULTS).untagged).toBeUndefined();
  });
});