import { describe, expect, it } from "vitest";
import { buildDatabaseSwitcherLabels } from "./database-switcher";

describe("database switcher helper", () => {
  it("returns the default operator range from db0 through db15", () => {
    expect(buildDatabaseSwitcherLabels(0)).toEqual([
      "db0",
      "db1",
      "db2",
      "db3",
      "db4",
      "db5",
      "db6",
      "db7",
      "db8",
      "db9",
      "db10",
      "db11",
      "db12",
      "db13",
      "db14",
      "db15",
    ]);
  });

  it("keeps an active out-of-range database visible and numerically ordered", () => {
    expect(buildDatabaseSwitcherLabels(23)).toEqual([
      "db0",
      "db1",
      "db2",
      "db3",
      "db4",
      "db5",
      "db6",
      "db7",
      "db8",
      "db9",
      "db10",
      "db11",
      "db12",
      "db13",
      "db14",
      "db15",
      "db23",
    ]);
  });

  it("normalizes negative or fractional inputs back to safe labels", () => {
    expect(buildDatabaseSwitcherLabels(-3)).toEqual([
      "db0",
      "db1",
      "db2",
      "db3",
      "db4",
      "db5",
      "db6",
      "db7",
      "db8",
      "db9",
      "db10",
      "db11",
      "db12",
      "db13",
      "db14",
      "db15",
    ]);
    expect(buildDatabaseSwitcherLabels(4.8, 2)).toEqual([
      "db0",
      "db1",
      "db2",
      "db4",
    ]);
  });
});