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'use strict';

const proxy = require('http-proxy-middleware');

const devConfig = require('./tools/getDevConfig');
let devPort = process.env.PORT || devConfig.port;

module.exports = function(server) {
    let cookieRules = devConfig.proxyConfig.cookieReplaceRules;
    let cookies = devConfig.proxyConfig.cookies;
    console.log('---------------------');

    let proxyConfigDefaults = {
        changeOrigin: true,
        secure: false,
        onProxyRes: (proxyRes, req, res) => {
            let setCookie = proxyRes.headers['set-cookie'];
            if (setCookie) {
                cookieRules.forEach(function(rule) {
                    setCookie[0] = setCookie[0].replace(
                        rule.replace,
                        rule.with
                    );
                });
            }
            if (
                proxyRes.statusCode === 302 &&
                proxyRes.headers.location.indexOf(devConfig.proxyConfig.login) >
                    -1
            ) {
                proxyRes.headers.location = `http://localhost:${devPort}/${
                    devConfig.proxyConfig.redirectionPath
                }`;
                let myCookies = [];
                for (let cookie in cookies) {
                    myCookies.push(cookie + '=' + cookies[cookie]);
                }
                res.setHeader('Set-Cookie', myCookies);
            }
        }
    };

    let middlewares = [
        (req, res, next) => {
            devConfig.proxyConfig.urlReplaceRules.forEach(function(rule) {
                if (req.url.indexOf(rule.url) > -1) {
                    req.url = req.url.replace(rule.replace, rule.with);
                }
            });
            devConfig.proxyConfig.jsReplaceRules.forEach(function(rule) {
                let regex = new RegExp('^(.*)' + rule.replace);
                let match = req.url.match(regex);
                let newUrl = match && match[1] + rule.with + '.js';
                if (newUrl) {
                    console.log(`REWRITING URL: ${req.url} -> ${newUrl}`);
                    req.url = newUrl;
                }
            });
            next();
        }
    ];

    let proxies = [];

    // standalone back-end (proxyTarget) has higher priority, so it should be first
    if (devConfig.proxyTarget) {
        console.log('Onboarding proxy set to : ' + devConfig.proxyTarget);
        proxies.push({
            target: devConfig.proxyTarget,
            config: devConfig.proxyConfig.onboardingProxy
        });
    } else {
        console.log(
            'Onboarding proxy set to : ' + devConfig.proxyCatalogTarget
        );
    }
    console.log('Catalog proxy set to : ' + devConfig.proxyCatalogTarget);
    proxies.push({
        target: devConfig.proxyCatalogTarget,
        config: devConfig.proxyConfig.catalogProxy
    });
    proxies.forEach(function(p) {
        middlewares.push(
            proxy(
                p.config.proxy,
                Object.assign({}, proxyConfigDefaults, {
                    target: p.target,
                    pathRewrite: p.config.rewrite
                })
            )
        );
    });

    let websocketTarget = devConfig.proxyCatalogTarget;
    if (devConfig.proxyWebsocketTarget) {
        websocketTarget = devConfig.proxyWebsocketTarget;
    }
    console.log('Websocket proxy set to : ' + websocketTarget);
    console.log('---------------------');
    var wsProxy = proxy(
        devConfig.proxyConfig.websocketProxy.proxy,
        Object.assign({}, proxyConfigDefaults, {
            target: websocketTarget,
            ws: true
        })
    );
    middlewares.push(wsProxy);

    server.use(middlewares);
    server.on('upgrade', wsProxy.upgrade);
};