import {createLogger} from "@gongt/ts-stl-library/debug/create-logger";
import {LOG_LEVEL} from "@gongt/ts-stl-library/debug/levels";
import {ErrorResponse, RequestError} from "@gongt/ts-stl-library/request/request-error";
import {Middleware} from "koa";

const logger = createLogger(LOG_LEVEL.INFO, 'std-err-handle');

export interface ErrorRenderFunction {
	(e: ErrorResponse): string;
}

const isJson = /\/json$/i;

export function standardErrorHandler(errorRender: ErrorRenderFunction): Middleware {
	return function standardErrorHandlerFromSTL({request, response}, next) {
		return next().catch((e) => {
			const eRes = RequestError.internal(e).response();
			if (isJson.test(request.type)) {
				logger('standard request error(json): %s - %s\n%s', eRes.statusName, eRes.errorDescription, eRes.errorStack);
				response.type = 'application/json';
				response.status = 200;
				response.body = eRes;
			} else {
				logger('standard request error(text): %s - %s\n%s', eRes.statusName, eRes.errorDescription, eRes.errorStack);
				response.status = 500;
				response.body = errorRender(eRes);
			}
		});
	}
}

export function standardJsonErrorHandler(): Middleware {
	return async function standardErrorHandlerFromSTL({request, response}, next) {
		try {
			await next();
		} catch (e) {
			logger('standard request error(json): %s', e.message);
			response.type = 'application/json';
			response.status = 200;
			response.body = RequestError.internal(e).response();
		}
	}
}