import * as _ from 'lodash';

import { isTestExecution } from '../constants';

type AsyncVoidAction = (...params: {}[]) => Promise<void>;

type VoidAction = (...params: {}[]) => void;

/**

* Debounces a function execution. Function must return either a void or a promise that resolves to a void.

* @export

* @param {number} [wait] Wait time.

* @returns void

*/

export function debounce(wait?: number) {

// tslint:disable-next-line:no-any no-function-expression

return function (_target: any, _propertyName: string, descriptor: TypedPropertyDescriptor<VoidAction> | TypedPropertyDescriptor<AsyncVoidAction>) {

const originalMethod = descriptor.value!;

// tslint:disable-next-line:no-invalid-this no-any

(descriptor as any).value = _.debounce(function () { return originalMethod.apply(this, arguments); }, wait);

};

}

/**

* Swallows exceptions thrown by a function. Function must return either a void or a promise that resolves to a void.

* @export

* @param {string} [scopeName] Scope for the error message to be logged along with the error.

* @returns void

*/

export function swallowExceptions(scopeName: string) {

// tslint:disable-next-line:no-any no-function-expression

return function (_target: any, propertyName: string, descriptor: TypedPropertyDescriptor<any>) {

const originalMethod = descriptor.value!;

const errorMessage = `Python Extension (Error in ${scopeName}, method:${propertyName}):`;

// tslint:disable-next-line:no-any no-function-expression

descriptor.value = function (...args: any[]) {

try {

// tslint:disable-next-line:no-invalid-this no-use-before-declare no-unsafe-any

const result = originalMethod.apply(this, args);

// If method being wrapped returns a promise then wait and swallow errors.

if (result && typeof result.then === 'function' && typeof result.catch === 'function') {

return (result as Promise<void>).catch(error => {

if (isTestExecution()) {

return;

}

console.error(errorMessage, error);

});

}

} catch (error) {

if (isTestExecution()) {

return;

}

console.error(errorMessage, error);

}

};

};

}