'use strict';

const qs = require('querystring');
const URL = require('node-url-utils');
const Normalizer = require('../../normalizer.js');

class DefaultNormalizer extends Normalizer{
	constructor(options){
		super(options);
		this.globalOptions = options || {};
	}

	/*
	 * Generate method + full uri + body string.
	 * - req, Object
	 * - [options], Object
	 */
	
	normalize(req, options) {
		options = options || {};

		if (!URL.parse(req.uri).search && req.qs) {
			req.uri = [req.uri, qs.stringify(req.qs) ].join('?');
		}

		if (req.method === 'POST') {
			if (req.json && typeof req.body === 'object') { //only support one level Object
				const sorted = Object.keys(req.body).map(k => [k, req.body[k]]).sort(function(a, b) {
					return a[0] === b[0] ? a[1] > b[1] : a[0] > b[0];
				}).reduce(function(pre, cur) {
					pre[cur[0]] = cur[1];
					return pre;
				}, Object.create(null));
				req.body = JSON.stringify(sorted);
			} else if (typeof req.form === 'object') {
				req.body = Object.keys(req.form).map(function(k) {
					return [k, req.form[k]].join('=');
				}).sort().join('&');
			} else if (typeof req.form === 'string') {
				req.body = req.form.split('&').sort().join('&');
			}
		}
		
		const opts = Object.assign({},this.globalOptions, options);
		if (opts.stripFragment !== false) {
			req.uri = req.uri.replace(/#.*/g, '');
		}
		
		return req;
	}
}

module.exports = DefaultNormalizer;