const log4js = require("log4js");
const clientLogger = log4js.getLogger("client");
const { Formidable } = require("formidable");
const apiHandler = require("../../handler/APIHandler");
const util = require("util");

exports.expressPreSession = async (hookName: string, { app }: any) => {
	// The Etherpad client side sends information about how a disconnect happened
	app.post("/ep/pad/connection-diagnostic-info", async (req: any, res: any) => {
		const [fields, files] = await new Formidable({}).parse(req);
		clientLogger.info(`DIAGNOSTIC-INFO: ${fields.diagnosticInfo}`);
		res.end("OK");
	});

	const parseJserrorForm = async (req: any) => {
		const form = new Formidable({
			maxFileSize: 1, // Files are not expected. Not sure if 0 means unlimited, so 1 is used.
		});
		const [fields, files] = await form.parse(req);
		return fields.errorInfo;
	};

	// The Etherpad client side sends information about client side javscript errors
	app.post("/jserror", (req: any, res: any, next: Function) => {
		(async () => {
			const data = JSON.parse(await parseJserrorForm(req));
			clientLogger.warn(`${data.msg} --`, {
				[util.inspect.custom]: (depth: number, options: any) => {
					// Depth is forced to infinity to ensure that all of the provided data is logged.
					options = Object.assign({}, options, {
						depth: Number.POSITIVE_INFINITY,
						colors: true,
					});
					return util.inspect(data, options);
				},
			});
			res.end("OK");
		})().catch((err) => next(err || new Error(err)));
	});

	// Provide a possibility to query the latest available API version
	app.get("/api", (req: any, res: any) => {
		res.json({ currentVersion: apiHandler.latestApiVersion });
	});
};