'use strict';

exports = module.exports = {
    proxy,
};

const assert = require('assert'),
    BoxError = require('../boxerror.js'),
    middleware = require('../middleware/index.js'),
    HttpError = require('connect-lastmile').HttpError,
    safe = require('safetydance'),
    services = require('../services.js'),
    url = require('url');

function proxy(kind) {
    assert(kind === 'mail' || kind === 'volume' || kind === 'app');

    return async function (req, res, next) {
        req.clearTimeout();

        let id = null;
        switch (kind) {
        case 'app': id = `app-${req.params.id}`; break;
        case 'volume': id = `volume-${req.params.id}`; break;
        case 'mail': id = 'mail'; break;
        }

        const [error, result] = await safe(services.getContainerDetails('sftp', 'CLOUDRON_SFTP_TOKEN'));
        if (error) return next(BoxError.toHttpError(error));

        let parsedUrl = url.parse(req.url, true /* parseQueryString */);
        parsedUrl.query['access_token'] = result.token;

        req.url = url.format({ pathname: `/files/${id}/${encodeURIComponent(req.params[0])}`, query: parsedUrl.query }); // params[0] already contains leading '/'

        const proxyOptions = url.parse(`http://${result.ip}:3000`);
        proxyOptions.rejectUnauthorized = false;
        const fileManagerProxy = middleware.proxy(proxyOptions);

        fileManagerProxy(req, res, function (error) {
            if (!error) return next();

            if (error.code === 'ECONNREFUSED') return next(new HttpError(424, 'Unable to connect to filemanager server'));
            if (error.code === 'ECONNRESET') return next(new HttpError(424, 'Unable to query filemanager server'));

            next(new HttpError(500, error));
        });
    };
}