/**
 * CJS test suite for moon-cycle v2.
 * Verifies CommonJS compatibility of the built package.
 */

"use strict";

const { describe, it } = require("node:test");
const assert = require("node:assert/strict");
const {
  cycleMonth,
  cycleYear,
  imageFolder,
  cdnUrl,
  SYNODIC_MONTH,
  MONTH_IMAGES,
  YEAR_IMAGES,
  MONTH_ANCHOR,
  YEAR_ANCHOR,
} = require("./dist/index.cjs");

describe("CJS exports", () => {
  it("all exports are available via require()", () => {
    assert.strictEqual(typeof cycleMonth, "function");
    assert.strictEqual(typeof cycleYear, "function");
    assert.strictEqual(typeof imageFolder, "function");
    assert.strictEqual(typeof cdnUrl, "function");
    assert.strictEqual(typeof SYNODIC_MONTH, "number");
    assert.strictEqual(typeof MONTH_IMAGES, "number");
    assert.strictEqual(typeof YEAR_IMAGES, "number");
    assert(MONTH_ANCHOR instanceof Date);
    assert(YEAR_ANCHOR instanceof Date);
  });

  it("cycleMonth at anchor returns 001.webp", () => {
    assert.strictEqual(cycleMonth(MONTH_ANCHOR), "001.webp");
  });

  it("cycleYear at anchor returns 0001.webp", () => {
    assert.strictEqual(cycleYear(YEAR_ANCHOR), "0001.webp");
  });

  it("cycleMonth result format is correct", () => {
    assert.match(cycleMonth(), /^\d{3}\.webp$/);
  });

  it("cycleYear result format is correct", () => {
    assert.match(cycleYear(), /^\d{4}\.webp$/);
  });

  it("imageFolder constructs correct path", () => {
    assert.strictEqual(imageFolder("mm", 256, 75), "mm-256-75");
  });

  it("cdnUrl returns expected jsDelivr URL", () => {
    assert.strictEqual(
      cdnUrl("001.webp", "mm", 256, 75),
      "https://cdn.jsdelivr.net/gh/acamarata/moon-cycle@main/mm-256-75/001.webp",
    );
  });

  it("cycleMonth throws TypeError for invalid Date", () => {
    assert.throws(() => cycleMonth(new Date("invalid")), {
      name: "TypeError",
      message: "date must be a valid Date instance",
    });
  });

  it("cycleYear throws TypeError for invalid Date", () => {
    assert.throws(() => cycleYear(new Date("invalid")), {
      name: "TypeError",
      message: "date must be a valid Date instance",
    });
  });
});