const Events = require("events");
const Validators = require("./validators");
const express = require("express");
const cors = require("cors");
const helmet = require("helmet");
const rateLimit = require("./rate-limit");
const config = require("../config");
const Database = require("../database");
const Mailer = require("../mail/sendgrid");
const DappConfig = require("../config/dapps");
const Controller = require("./controller");
const BadRequest = require("./bad-request");
const events = new Events();
const dappConfig = new DappConfig();
const mailer = new Mailer(config);
const db = new Database(events, config);

db.init();

events.on("db:connected", () => {
  const app = express();

  app.use(rateLimit());
  app.use(cors());
  app.use(express.json());
  app.use(express.urlencoded({ extended: true }));
  app.use(helmet.expectCt({ enforce: true, maxAge: 60 }));
  app.use(helmet());
  app.set("trust proxy", 1);

  app.post("/:dappId/subscribe", Validators.subscribe, Controller.subscribe(dappConfig, mailer));
  app.post("/:dappId/unsubscribe", Validators.unsubscribe, Controller.unsubscribe(dappConfig));
  app.get("/confirm/:token", Validators.confirm, Controller.confirm());
  app.get("/:dappId/user/:address", Validators.userExists, Controller.userExists());
  app.get("/", (req, res) => res.status(200).json({ ok: true }));

  app.use(function(err, req, res, next) {
    if (!err.statusCode) err.statusCode = 500;
    const response = { error: err.message };
    if (err instanceof BadRequest && err.details) {
      response.details = err.details;
    } else {
      console.error(err);
      response.error = "Service unavailable";
    }
    res.status(err.statusCode).json(response);
  });

  app.listen(config.PORT, () => console.log(`App listening on port ${config.PORT}!`));
});

// MVP
// ====

// TODO: register DAPP and content
// TODO: handle errors sending email