/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import type { URI, UriComponents } from './vscode-uri/uri';

/**
 * @returns whether the provided parameter is a JavaScript Array or not.
 */
export function isArray(array: any): array is any[] {
  return Array.isArray(array);
}

/**
 * @returns whether the provided parameter is a JavaScript String or not.
 */
export function isString(str: unknown): str is string {
  return typeof str === 'string';
}

/**
 * @returns whether the provided parameter is a JavaScript Array and each element in the array is a string.
 */
export function isStringArray(value: unknown): value is string[] {
  return Array.isArray(value) && (<unknown[]>value).every((elem) => isString(elem));
}

/**
 *
 * @returns whether the provided parameter is of type `object` but **not**
 *	`null`, an `array`, a `regexp`, nor a `date`.
 */
export function isObject(obj: unknown): obj is Record<any, any> {
  // The method can't do a type cast since there are type (like strings) which
  // are subclasses of any put not positvely matched by the function. Hence type
  // narrowing results in wrong results.
  return (
    typeof obj === 'object' &&
    obj !== null &&
    !Array.isArray(obj) &&
    !(obj instanceof RegExp) &&
    !(obj instanceof Date)
  );
}

/**
 * In **contrast** to just checking `typeof` this will return `false` for `NaN`.
 * @returns whether the provided parameter is a JavaScript Number or not.
 */
export function isNumber(obj: unknown): obj is number {
  return typeof obj === 'number' && !isNaN(obj);
}

/**
 * @returns whether the provided parameter is a JavaScript Boolean or not.
 */
export function isBoolean(obj: unknown): obj is boolean {
  return obj === true || obj === false;
}

/**
 * @returns whether the provided parameter is undefined.
 */
export function isUndefined(obj: unknown): obj is undefined {
  return typeof obj === 'undefined';
}

/**
 * @returns whether the provided parameter is defined.
 */
export function isDefined<T>(arg: T | null | undefined): arg is T {
  return !isUndefinedOrNull(arg);
}

/**
 * @returns whether the provided parameter is undefined or null.
 */
export function isUndefinedOrNull(obj: unknown): obj is undefined | null {
  return isUndefined(obj) || obj === null;
}

export function assertType(condition: unknown, type?: string): asserts condition {
  if (!condition) {
    throw new Error(type ? `Unexpected type, expected '${type}'` : 'Unexpected type');
  }
}

/**
 * Asserts that the argument passed in is neither undefined nor null.
 */
export function assertIsDefined<T>(arg: T | null | undefined): T {
  if (isUndefinedOrNull(arg)) {
    throw new Error('Assertion Failed: argument is undefined or null');
  }

  return arg;
}

/**
 * Asserts that each argument passed in is neither undefined nor null.
 */
export function assertAllDefined<T1, T2>(
  t1: T1 | null | undefined,
  t2: T2 | null | undefined,
): [T1, T2];
export function assertAllDefined<T1, T2, T3>(
  t1: T1 | null | undefined,
  t2: T2 | null | undefined,
  t3: T3 | null | undefined,
): [T1, T2, T3];
export function assertAllDefined<T1, T2, T3, T4>(
  t1: T1 | null | undefined,
  t2: T2 | null | undefined,
  t3: T3 | null | undefined,
  t4: T4 | null | undefined,
): [T1, T2, T3, T4];
export function assertAllDefined(...args: (unknown | null | undefined)[]): unknown[] {
  const result = [];

  for (let i = 0; i < args.length; i++) {
    const arg = args[i];

    if (isUndefinedOrNull(arg)) {
      throw new Error(`Assertion Failed: argument at index ${i} is undefined or null`);
    }

    result.push(arg);
  }

  return result;
}

const { hasOwnProperty } = Object.prototype;

/**
 * @returns whether the provided parameter is an empty JavaScript Object or not.
 */
export function isEmptyObject(obj: unknown): obj is object {
  if (!isObject(obj)) {
    return false;
  }

  for (const key in obj) {
    if (hasOwnProperty.call(obj, key)) {
      return false;
    }
  }

  return true;
}

/**
 * @returns whether the provided parameter is a JavaScript Function or not.
 */
export function isFunction(obj: unknown): obj is (...args: any[]) => any {
  return typeof obj === 'function';
}

/**
 * @returns whether the provided parameters is are JavaScript Function or not.
 */
export function areFunctions(...objects: unknown[]): boolean {
  return objects.length > 0 && objects.every(isFunction);
}

export type TypeConstraint = string | ((...args: any[]) => any);

export function validateConstraints(
  args: unknown[],
  constraints: (TypeConstraint | undefined)[],
): void {
  const len = Math.min(args.length, constraints.length);
  for (let i = 0; i < len; i++) {
    validateConstraint(args[i], constraints[i]);
  }
}

export function validateConstraint(
  arg: unknown,
  constraint: TypeConstraint | undefined,
): void {
  if (isString(constraint)) {
    if (typeof arg !== constraint) {
      throw new Error(`argument does not match constraint: typeof ${constraint}`);
    }
  } else if (isFunction(constraint)) {
    try {
      if (arg instanceof constraint) {
        return;
      }
    } catch {
      // ignore
    }
    if (!isUndefinedOrNull(arg) && (arg as any).constructor === constraint) {
      return;
    }
    if (constraint.length === 1 && constraint.call(undefined, arg) === true) {
      return;
    }
    throw new Error(
      `argument does not match one of these constraints: arg instanceof constraint, arg.constructor === constraint, nor constraint(arg) === true`,
    );
  }
}

export function getAllPropertyNames(obj: object): string[] {
  let res: string[] = [];
  let proto = Object.getPrototypeOf(obj);
  while (Object.prototype !== proto) {
    res = res.concat(Object.getOwnPropertyNames(proto));
    proto = Object.getPrototypeOf(proto);
  }
  return res;
}

export function getAllMethodNames(obj: object): string[] {
  const methods: string[] = [];
  for (const prop of getAllPropertyNames(obj)) {
    if (typeof (obj as any)[prop] === 'function') {
      methods.push(prop);
    }
  }
  return methods;
}

export function createProxyObject<T extends object>(
  methodNames: string[],
  invoke: (method: string, args: unknown[]) => unknown,
): T {
  const createProxyMethod = (method: string): (() => unknown) => {
    return function () {
      // eslint-disable-next-line prefer-rest-params
      const args = Array.prototype.slice.call(arguments, 0);
      return invoke(method, args);
    };
  };

  const result = {} as T;
  for (const methodName of methodNames) {
    (<any>result)[methodName] = createProxyMethod(methodName);
  }
  return result;
}

/**
 * Converts null to undefined, passes all other values through.
 */
export function withNullAsUndefined<T>(x: T | null): T | undefined {
  return x === null ? undefined : x;
}

/**
 * Converts undefined to null, passes all other values through.
 */
export function withUndefinedAsNull<T>(x: T | undefined): T | null {
  return typeof x === 'undefined' ? null : x;
}

/**
 * Allows to add a first parameter to functions of a type.
 */
export type AddFirstParameterToFunctions<
  Target,
  TargetFunctionsReturnType,
  FirstParameter,
> = {
  //  For every property
  [K in keyof Target]: Target[K] extends (...args: any[]) => TargetFunctionsReturnType // Function: add param to function
    ? (
        firstArg: FirstParameter,
        ...args: Parameters<Target[K]>
      ) => ReturnType<Target[K]>
    : // Else: just leave as is
      Target[K];
};

/**
 * Mapped-type that replaces all occurrences of URI with UriComponents
 */
export type UriDto<T> = {
  [K in keyof T]: T[K] extends URI ? UriComponents : UriDto<T[K]>;
};

/**
 * Mapped-type that replaces all occurrences of URI with UriComponents and
 * drops all functions.
 */
export type Dto<T> = T extends { toJSON: () => infer U }
  ? U
  : T extends object
    ? { [k in keyof T]: Dto<T[k]> }
    : T;

export function NotImplementedProxy<T>(name: string): { new (): T } {
  return <any>class {
    constructor() {
      return new Proxy(
        {},
        {
          get(target: any, prop: PropertyKey) {
            if (target[prop]) {
              return target[prop];
            }
            throw new Error(`Not Implemented: ${name}->${String(prop)}`);
          },
        },
      );
    }
  };
}