'use strict';

var Hashcash = require('./hashcash.js');
var _sites = {};

module.exports = async function (opts) {
	if (!opts.headers) {
		opts.headers = {};
	}

	if (opts.json) {
		if (true === opts.json) {
			opts.body = JSON.stringify(opts.body);
		} else {
			opts.body = JSON.stringify(opts.json);
		}
		if (!opts.headers['Content-Type'] && !opts.headers['content-type']) {
			opts.headers['Content-Type'] = 'application/json';
		}
	}

	if (!opts.mode) {
		opts.mode = 'cors';
	}

	var url = new URL(opts.url);
	if (!_sites[url.hostname]) {
		_sites[url.hostname] = { nonces: [] };
	}

	var site = _sites[url.hostname];
	var hc = site.hashcashChallenge;
	if (hc) {
		delete site.hashcashChallenge;
		site.hashcash = await Hashcash.solve(hc);
	}
	if (site.hashcash) {
		opts.headers.Hashcash = site.hashcash;
	}

	var response = await window.fetch(opts.url, opts);
	var headerNames = response.headers.keys();
	var hs = {};
	var h;
	while (true) {
		h = headerNames.next();
		if (h.done) {
			break;
		}
		hs[h.value] = response.headers.get(h.value);
	}

	var body;
	if (hs['content-type'].includes('application/json')) {
		body = await response.json();
	} else {
		body = await response.text();
		try {
			body = JSON.parse(body);
		} catch (e) {
			// ignore
		}
	}
	var resp = {};

	resp.body = body;
	resp.headers = hs;
	resp.toJSON = function () {
		return {
			headers: hs,
			body: body
		};
	};

	if (resp.headers['hashcash-challenge']) {
		_sites[url.hostname].hashcashChallenge =
			resp.headers['hashcash-challenge'];
	}
	if (resp.headers.nonce) {
		site.nonces.push(resp.headers.nonce);
	}

  console.log(resp);
	return resp;
};