import express from "express";
import bodyParser from "body-parser";
import {createServer} from "http";
import {create} from "express-handlebars";
import {escape} from "lodash-es";
import {sanitizeUrl} from "@braintree/sanitize-url";
import path from "path";

export function init() {
  const app = express();

  // parse application/x-www-form-urlencoded
  app.use(bodyParser.urlencoded({extended: false}));

  // parse application/json
  app.use(bodyParser.json());

  const hbs = getHandlebarsViewEngine();

  app.engine('.hbs', hbs.engine);
  app.set('view engine', '.hbs');

  const modulesPath = '.';
  app.set('views', path.join(modulesPath, 'layouts'));

  // Static Files of blockDevTool.
  app.use(express.static(path.join(modulesPath, 'layouts')));

  return {
    expressApp: app,
    httpServer: createServer(app),
  };
}

function getHandlebarsViewEngine() {
  return create({
    extname: '.hbs', defaultLayout: false, partialsDir: ['.'], helpers: handlebarsHelpers()
  });
}

function handlebarsHelpers() {
  return {
    esc_attr(attr) {
      return escape(attr);
    },
    esc_url(url) {
      return sanitizeUrl(url);
    },
    esc_html(html) {
      return html;
    },
  };
}