/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

// The functions in this file verify that the assumptions we are making
// about state in an instruction are correct before implementing any logic.
// They are meant only to be called in dev mode as sanity checks.

export function assertNumber(actual: any, msg: string) {
  if (typeof actual != 'number') {
    throwError(msg);
  }
}

export function assertEqual<T>(actual: T, expected: T, msg: string) {
  if (actual != expected) {
    throwError(msg);
  }
}

export function assertNotEqual<T>(actual: T, expected: T, msg: string) {
  if (actual == expected) {
    throwError(msg);
  }
}

export function assertSame<T>(actual: T, expected: T, msg: string) {
  if (actual !== expected) {
    throwError(msg);
  }
}

export function assertNotSame<T>(actual: T, expected: T, msg: string) {
  if (actual === expected) {
    throwError(msg);
  }
}

export function assertLessThan<T>(actual: T, expected: T, msg: string) {
  if (actual >= expected) {
    throwError(msg);
  }
}

export function assertGreaterThan<T>(actual: T, expected: T, msg: string) {
  if (actual <= expected) {
    throwError(msg);
  }
}

export function assertNotDefined<T>(actual: T, msg: string) {
  if (actual != null) {
    throwError(msg);
  }
}

export function assertDefined<T>(actual: T, msg: string) {
  if (actual == null) {
    throwError(msg);
  }
}

export function throwError(msg: string): never {
  // tslint:disable-next-line
  debugger;  // Left intentionally for better debugger experience.
  throw new Error(`ASSERTION ERROR: ${msg}`);
}

export function assertDomNode(node: any) {
  // If we're in a worker, `Node` will not be defined.
  assertEqual(
      (typeof Node !== 'undefined' && node instanceof Node) ||
          (typeof node === 'object' && node.constructor.name === 'WebWorkerRenderNode'),
      true, 'The provided value must be an instance of a DOM Node');
}


export function assertDataInRange(arr: any[], index: number) {
  const maxLen = arr ? arr.length : 0;
  assertLessThan(index, maxLen, `Index expected to be less than ${maxLen} but got ${index}`);
}