'use strict';

const { ipHashPermLevel } = require(__dirname+'/../configs/main.js')
	, { parse } = require('ip6addr')
	, hashIp = require(__dirname+'/haship.js');

module.exports = (req, res, next) => {
	const ip = req.headers['x-real-ip'] || req.connection.remoteAddress; //need to consider forwarded-for, etc here and in nginx
	try {
		const ipParsed = parse(ip);
		const ipStr = ipParsed.toString({
			format: ipParsed.kind() === 'ipv4' ? 'v4' : 'v6',
			zeroElide: false,
			zeroPad: false,
		});
		const delimiter = ipParsed.kind() === 'ipv4' ? '.' : ':';
		let split = ipStr.split(delimiter);
		const qrange = split.slice(0,Math.floor(split.length*0.75)).join(delimiter);
		const hrange = split.slice(0,Math.floor(split.length*0.5)).join(delimiter);
		res.locals.ip = {
			raw: ipHashPermLevel === -1 ? hashIp(ipStr) : ipStr,
			single: hashIp(ipStr),
			qrange: hashIp(qrange),
			hrange: hashIp(hrange),
		}
		next();
	} catch(e)  {
		console.error('Ip parse failed', e);
		return res.status(400).render('message', {
			'title': 'Bad request',
			'message': 'Malformed IP' //should never get here
		});
	}
}