/**
 * earth-now.co
 * Author:  Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 * File:    apps/web/test/consistency.node.test.ts
 * Purpose: Client/server consistency — counterValue in the NODE environment must match the closed-form values bit-for-bit (Object.is)
 */

import { describe, expect, it } from "vitest";
import { counterValue, parseIsoUtc } from "@earth-now/counter";
import {
  INSTANTS,
  LINEAR_MODEL,
  SEASONAL_MODEL,
  linearClosedForm,
  seasonalClosedForm,
} from "./consistency-shared";

describe("counterValue consistency (node environment)", () => {
  it("runs in a server-like environment (no DOM)", () => {
    expect(typeof globalThis.window).toBe("undefined");
  });

  it("value(anchorTime) === anchorValue exactly", () => {
    const anchorMs = parseIsoUtc(LINEAR_MODEL.anchorTime);
    expect(Object.is(counterValue(LINEAR_MODEL, anchorMs), LINEAR_MODEL.anchorValue)).toBe(true);
    expect(Object.is(counterValue(SEASONAL_MODEL, anchorMs), SEASONAL_MODEL.anchorValue)).toBe(
      true,
    );
  });

  it("matches the linear closed form bit-for-bit at all five instants", () => {
    for (const t of INSTANTS) {
      expect(Object.is(counterValue(LINEAR_MODEL, t), linearClosedForm(t))).toBe(true);
    }
  });

  it("matches the seasonal closed form bit-for-bit at all five instants", () => {
    for (const t of INSTANTS) {
      expect(Object.is(counterValue(SEASONAL_MODEL, t), seasonalClosedForm(t))).toBe(true);
    }
  });

  it("is deterministic: re-evaluation yields Object.is-identical numbers", () => {
    for (const t of INSTANTS) {
      expect(Object.is(counterValue(LINEAR_MODEL, t), counterValue(LINEAR_MODEL, t))).toBe(true);
      expect(Object.is(counterValue(SEASONAL_MODEL, t), counterValue(SEASONAL_MODEL, t))).toBe(
        true,
      );
    }
  });
});