import { describe, it } from "node:test";
import assert from "node:assert/strict";
import {
  calculateCurrentA,
  calculateDemandPowerKw,
  calculateInstalledPowerKw,
} from "../src/domain/calculations/power-calculation.js";

describe("power calculation", () => {
  it("calculates installed power", () => {
    const result = calculateInstalledPowerKw({
      quantity: 4,
      installedPowerPerUnitKw: 1.2,
      demandFactor: 0.8,
    });
    assert.ok(Math.abs(result - 4.8) < 0.00001);
  });

  it("calculates demand power", () => {
    const result = calculateDemandPowerKw({
      quantity: 4,
      installedPowerPerUnitKw: 1.2,
      demandFactor: 0.8,
    });
    assert.ok(Math.abs(result - 3.84) < 0.00001);
  });

  it("handles zero quantity", () => {
    const result = calculateInstalledPowerKw({
      quantity: 0,
      installedPowerPerUnitKw: 3,
      demandFactor: 0.9,
    });
    assert.equal(result, 0);
  });

  it("handles zero demand factor", () => {
    const result = calculateDemandPowerKw({
      quantity: 5,
      installedPowerPerUnitKw: 2,
      demandFactor: 0,
    });
    assert.equal(result, 0);
  });

  it("calculates single-phase current", () => {
    const current = calculateCurrentA({
      demandPowerKw: 2.3,
      voltageV: 230,
      phaseCount: 1,
      powerFactor: 0.95,
    });
    assert.ok(Math.abs(current - 10.53) < 0.02);
  });

  it("calculates three-phase current", () => {
    const current = calculateCurrentA({
      demandPowerKw: 9.5,
      voltageV: 400,
      phaseCount: 3,
      powerFactor: 0.9,
    });
    assert.ok(Math.abs(current - 15.23) < 0.02);
  });
});