import { expect } from "chai";
import { describe, it } from "mocha";
import { ExponentialRate, FixedRate, InverseRate, Rate, StepRate } from "../../../src";
import { randInt } from "../../../src";

describe("Rate", () => {
  it("FixedRate", () => {
    const baseRate: number = Math.random();
    const iteration: number = randInt(1, 100);

    const fixedRate: Rate = new FixedRate(baseRate);
    expect(fixedRate.calc(iteration)).to.be.a("number");
    expect(fixedRate.calc(iteration + 10)).to.be.equal(fixedRate.calc(iteration));
  });

  it("StepRate", () => {
    const baseRate: number = Math.random();
    const iteration: number = randInt(1, 100);
    const gamma: number = Math.random();
    const stepSize: number = randInt(1, 100);

    const stepRate: StepRate = new StepRate(baseRate, gamma, stepSize);
    expect(stepRate.calc(iteration)).to.be.a("number");
    expect(stepRate.calc(iteration + 10)).to.be.at.most(stepRate.calc(iteration));
  });

  it("ExponentialRate", () => {
    const baseRate: number = Math.random();
    const iteration: number = randInt(1, 100);
    const gamma: number = Math.random();

    const exponentialRate: ExponentialRate = new ExponentialRate(baseRate, gamma);
    expect(exponentialRate.calc(iteration)).to.be.a("number");
    expect(exponentialRate.calc(iteration + 10)).to.be.below(exponentialRate.calc(iteration));
  });

  it("InverseRate", () => {
    const baseRate: number = Math.random();
    const iteration: number = randInt(1, 100);
    const gamma: number = Math.random();
    const power: number = randInt(1, 100);

    const inverseRate: InverseRate = new InverseRate(baseRate, gamma, power);
    expect(inverseRate.calc(iteration)).to.be.a("number");
    expect(inverseRate.calc(iteration + 10)).to.be.below(inverseRate.calc(iteration));
  });
});