import { describe, expect, test } from "bun:test";
import {
  parseOptionalInt,
  parsePositiveInt,
  parseTimestampRange,
} from "./api-params";

describe("API parameter parsing", () => {
  test("uses defaults and clamps positive integer ranges", () => {
    expect(parsePositiveInt(null, { field: "limit", defaultValue: 50, min: 1, max: 100 })).toEqual({
      ok: true,
      value: 50,
    });
    expect(parsePositiveInt("500", { field: "limit", defaultValue: 50, min: 1, max: 100 })).toEqual({
      ok: true,
      value: 100,
    });
    expect(parsePositiveInt("0", { field: "page", defaultValue: 1, min: 1 })).toEqual({
      ok: true,
      value: 1,
    });
  });

  test("rejects NaN, decimals, and negative values", () => {
    expect(parseOptionalInt("abc", "start")).toEqual({
      ok: false,
      field: "start",
    });
    expect(parsePositiveInt("1.5", { field: "page", defaultValue: 1, min: 1 })).toEqual({
      ok: false,
      field: "page",
    });
    expect(parsePositiveInt("-2", { field: "page", defaultValue: 1, min: 1 })).toEqual({
      ok: false,
      field: "page",
    });
  });

  test("rejects reversed timestamp ranges", () => {
    expect(parseTimestampRange(new URLSearchParams("start=200&end=100"))).toEqual({
      ok: false,
      field: "range",
    });
  });
});