/*
 * Copyright (c) 2019 Convergence Labs, Inc.
 *
 * This file is part of the CodeMirror Collaborative Extensions, which is
 * released under the terms of the MIT license. A copy of the MIT license
 * is usually provided as part of this source code package in the LICENCE
 * file. If it was not, please see <https://opensource.org/licenses/MIT>
 */

/**
 * A helper class to aid in input validation.
 *
 * @internal
 */
export class Validation {
  public static assertString(val: any, name: string): void {
    if (typeof val !== "string") {
      throw new Error(`${name} must be a string but was: ${val}`);
    }
  }

  public static assertNumber(val: any, name: string): void {
    if (typeof val !== "number") {
      throw new Error(`${name} must be a number but was: ${val}`);
    }
  }

  public static assertDefined(val: any, name: string): void {
    if (val === undefined || val === null) {
      throw new Error(`${name} must be a defined but was: ${val}`);
    }
  }

  public static assertFunction(val: any, name: string): void {
    if (typeof val !== "function") {
      throw new Error(`${name} must be a function but was: ${typeof val}`);
    }
  }

  public static assertPosition(val: any, name: string): void {
    Validation.assertDefined(val, name);

    if (typeof val.lineNumber !== "number" || typeof val.column !== "number") {
      throw new Error(`${name} must be an Object like {lineNumber: number, column: number}: ${JSON.stringify(val)}`);
    }
  }
}