import { expect } from "chai";

import { DPT4 } from "../src/DPT4"
import { BufferLengthError } from "../src/errors/BufferLengthError";
import { InvalidValueError } from "../src/errors/InvalidValueError";

import { compareBuffers } from "./util"

let bufferA = Buffer.from([65])

let bufferEmpty = Buffer.from([])
let bufferBiggerSize = Buffer.from([1, 0])

describe("Test DPT004", (): void => {

  let dpt = new DPT4();

  it("Decode buffer with letter [A]", async function () {
    const value = dpt.decoder(bufferA)
    expect(value).is.equal('A');
  });

  it("Decode empty buffer", async function () {
    var testFunction = function () {
      const value = dpt.decoder(bufferEmpty)
    }
    expect(testFunction).to.throw(BufferLengthError);
  });

  it("Decode oversized buffer", async function () {
    var testFunction = function () {
      const value = dpt.decoder(bufferBiggerSize)
    }
    expect(testFunction).to.throw(BufferLengthError);
  });

  /* Encoder tests */
  it("encode valid", async function () {
    expect(compareBuffers(dpt.encoder('A'), bufferA)).is.true;
  });

  it("encode invalid", async function () {
    var testFunction = function () {
      const value = dpt.encoder("\u03c0")
    }
    expect(testFunction).to.throw(InvalidValueError);
  });

  it("encode undefined", async function () {
    var testFunction = function () {
      const value = dpt.encoder(undefined)
    }
    expect(testFunction).to.throw(InvalidValueError);
  });


});