const moment = require("moment-timezone");

const date_formats = Object.freeze({
    post_date: "Do MMMM YYYY HH:mm:ss z",
    file_date: "YYYY-MM-DD HH:mm:ss z",
    rss_date: "ddd, DD MMM YYYY HH:mm:ss ZZ",
    id_date: "YYYYMMDD-HHmm" });

function datetime(date, format=date_formats.post_date, timezone="UTC") {
    return moment.utc(date).tz(timezone).format(format);
}

function getClientTimezone(ctx) {
    if (ctx.header['x-client-timezone'] !== undefined)
        return ctx.header['x-client-timezone'];
    else
        return "UTC";
}

function getServiceByHost(host, service="") {
    if (host.endsWith("onion"))
        switch (service) {
            case "radio": return "http://wsmkgnmhmzqm7kyzv7jnzzafvgm7xlmlfvzhgorpapd5or2arnhuktqd.onion";
            case "files": return "http://qf5e43nlhvnrutmikuvbdfj3cmtthokpbaxtkm6mjlslttzvtgm4fxid.onion";
            case "git": return "http://qqitm7qlsbbubwmjos4cqzmvkqidg34rfnbyhuydhalep33fbvh22xyd.onion";
            default: return "http://moq7aejnf4xk5k2bkaltli3ftkhusy2mbrd3pj23nrca343ku2mgk4yd.onion";
        }
    else if (host.endsWith("i2p"))
        switch (service) {
            case "radio": return "http://radio.arav.i2p";
            case "files": return "http://files.arav.i2p";
            case "git": return "http://git.arav.i2p";
            default: return "http://arav.i2p";
        }
    else if (host.startsWith("[300")) // Yggdrasil
        switch (service) {
            case "radio": return "http://[300:a98d:d6d0:8a08::e]";
            case "files": return "http://[300:a98d:d6d0:8a08::d]";
            case "git": return "http://[300:a98d:d6d0:8a08::b]";
            default: return "http://[300:a98d:d6d0:8a08::f]";
        }
    else
        switch (service) {
            case "radio": return "https://radio.arav.su";
            case "files": return "https://files.arav.su";
            case "git": return "https://git.arav.su";
            default: return "https://arav.su";
        }
}

function rssLink(schemahost, date, category, timezone="UTC") {
    return `${schemahost}/mindflow#${category}-${datetime(date, date_formats.id_date, timezone)}`;
}

// This code was taken from https://www.npmjs.com/package/mysql#custom-format
// Only fourth line was changed.
function mysqlQueryFormat(query, values) {
	if (!values) return query;
	return query.replace(/\:(\w+)/g, function (txt, key) {
		if (values[key] !== undefined)
			return this.escape(values[key]);
		return txt;
	}.bind(this));
};

module.exports = { date_formats, datetime, getClientTimezone, getServiceByHost, rssLink, mysqlQueryFormat }