numerica/packages/web-api/src/modules/adder/adder.controller.ts

import { RouteHandlerMethod } from 'fastify';
import {
	AdderService,
	AdderServiceImpl,
	ArgumentOutOfRangeError,
	InvalidArgumentTypeError,
} from '@/modules/adder/adder.service';
import { constants } from 'http2';

export interface AdderController {
	addNumbers: RouteHandlerMethod;
	subtractNumbers: RouteHandlerMethod;
}

export class AdderControllerImpl implements AdderController {
	constructor(
		private readonly adderService: AdderService = new AdderServiceImpl(),
	) {
		// noop
	}

	readonly addNumbers: RouteHandlerMethod = async (request, reply) => {
		const { a, b } = request.body as { a: number; b: number };
		try {
			const response = this.adderService.addNumbers({ a, b });
			reply.send(response);
		} catch (errorRaw) {
			if (errorRaw instanceof InvalidArgumentTypeError) {
				request.log.info(errorRaw);
				reply.status(constants.HTTP_STATUS_BAD_REQUEST).send(errorRaw.message);
				return;
			}
			if (errorRaw instanceof ArgumentOutOfRangeError) {
				reply.status(constants.HTTP_STATUS_BAD_REQUEST).send(errorRaw.message);
				return;
			}
			const error = errorRaw as Error;
			reply.status(constants.HTTP_STATUS_INTERNAL_SERVER_ERROR).send(error.message);
		}
	}

	readonly subtractNumbers: RouteHandlerMethod = async (request, reply) => {
		const { a, b } = request.body as { a: number; b: number };
		try {
			const response = this.adderService.addNumbers({ a, b: -b });
			reply.send(response);
		} catch (errorRaw) {
			if (errorRaw instanceof InvalidArgumentTypeError) {
				reply.status(constants.HTTP_STATUS_BAD_REQUEST).send(errorRaw.message);
				return;
			}
			if (errorRaw instanceof ArgumentOutOfRangeError) {
				reply.status(constants.HTTP_STATUS_BAD_REQUEST).send(errorRaw.message);
				return;
			}
			const error = errorRaw as Error;
			reply.status(constants.HTTP_STATUS_INTERNAL_SERVER_ERROR).send(error.message);
		}
	}
}