/**
 * Copyright (c) 2018 The xterm.js authors. All rights reserved.
 * @license MIT
 */
import { assert } from 'chai';
import { fillFallback, concat } from 'common/TypedArrayUtils';

type TypedArray = Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Int8Array | Int16Array | Int32Array | Float32Array | Float64Array;

function deepEquals(a: TypedArray, b: TypedArray): void {
  assert.equal(a.length, b.length);
  for (let i = 0; i < a.length; ++i) {
    assert.equal(a[i], b[i]);
  }
}

describe('polyfill conformance tests', function(): void {
  describe('TypedArray.fill', function(): void {
    it('should work with all typed array types', function(): void {
      const u81 = new Uint8Array(5);
      const u82 = new Uint8Array(5);
      deepEquals(fillFallback(u81, 2), u82.fill(2));
      deepEquals(fillFallback(u81, -1), u82.fill(-1));
      const u161 = new Uint16Array(5);
      const u162 = new Uint16Array(5);
      deepEquals(fillFallback(u161, 2), u162.fill(2));
      deepEquals(fillFallback(u161, 65535), u162.fill(65535));
      deepEquals(fillFallback(u161, -1), u162.fill(-1));
      const u321 = new Uint32Array(5);
      const u322 = new Uint32Array(5);
      deepEquals(fillFallback(u321, 2), u322.fill(2));
      deepEquals(fillFallback(u321, 65537), u322.fill(65537));
      deepEquals(fillFallback(u321, -1), u322.fill(-1));
      const i81 = new Int8Array(5);
      const i82 = new Int8Array(5);
      deepEquals(fillFallback(i81, 2), i82.fill(2));
      deepEquals(fillFallback(i81, -1), i82.fill(-1));
      const i161 = new Int16Array(5);
      const i162 = new Int16Array(5);
      deepEquals(fillFallback(i161, 2), i162.fill(2));
      deepEquals(fillFallback(i161, 65535), i162.fill(65535));
      deepEquals(fillFallback(i161, -1), i162.fill(-1));
      const i321 = new Int32Array(5);
      const i322 = new Int32Array(5);
      deepEquals(fillFallback(i321, 2), i322.fill(2));
      deepEquals(fillFallback(i321, 65537), i322.fill(65537));
      deepEquals(fillFallback(i321, -1), i322.fill(-1));
      const f321 = new Float32Array(5);
      const f322 = new Float32Array(5);
      deepEquals(fillFallback(f321, 1.2345), f322.fill(1.2345));
      const f641 = new Float64Array(5);
      const f642 = new Float64Array(5);
      deepEquals(fillFallback(f641, 1.2345), f642.fill(1.2345));
      const u8Clamped1 = new Uint8ClampedArray(5);
      const u8Clamped2 = new Uint8ClampedArray(5);
      deepEquals(fillFallback(u8Clamped1, 2), u8Clamped2.fill(2));
      deepEquals(fillFallback(u8Clamped1, 257), u8Clamped2.fill(257));
    });
    it('start offset', function(): void {
      for (let i = -2; i < 10; ++i) {
        const u81 = new Uint8Array(5);
        const u83 = new Uint8Array(5);
        deepEquals(fillFallback(u81, 2, i), u83.fill(2, i));
        deepEquals(fillFallback(u81, -1, i), u83.fill(-1, i));
      }
    });
    it('end offset', function(): void {
      for (let i = -2; i < 10; ++i) {
        const u81 = new Uint8Array(5);
        const u83 = new Uint8Array(5);
        deepEquals(fillFallback(u81, 2, 0, i), u83.fill(2, 0, i));
        deepEquals(fillFallback(u81, -1, 0, i), u83.fill(-1, 0, i));
      }
    });
    it('start/end offset', function(): void {
      for (let i = -2; i < 10; ++i) {
        for (let j = -2; j < 10; ++j) {
          const u81 = new Uint8Array(5);
          const u83 = new Uint8Array(5);
          deepEquals(fillFallback(u81, 2, i, j), u83.fill(2, i, j));
          deepEquals(fillFallback(u81, -1, i, j), u83.fill(-1, i, j));
        }
      }
    });
  });
});

describe('typed array convenience functions', () => {
  it('concat', () => {
    const a = new Uint8Array([1, 2, 3, 4, 5]);
    const b = new Uint8Array([6, 7, 8, 9, 0]);
    const merged = concat(a, b);
    deepEquals(merged, new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]));
  });
});