var express = require("express");
var app = express();

const path = require("path");
const publicPath = path.join(__dirname + "", "../public");
var exphbs = require("express-handlebars");
var hbs = exphbs.create({
  defaultLayout: publicPath + "/layouts/admin/main",
  layoutsDir: publicPath + "/layouts",
  partialsDir: publicPath + "/partials"
});

var passport = require("passport");
var mpromise = require("mpromise");
var LocalStrategy = require("passport-local").Strategy;
var mongoose = require("mongoose");
var mongo_db_cred = require(pathThumbnails + "/config/mongo_config.js");
var mongojs = require("mongojs");
var db = mongojs(mongo_db_cred.config);
var token_db = mongojs("tokens");
var bodyParser = require("body-parser");
var session = require("express-session");
var MongoStore = require("connect-mongo")(session);
var api = require(pathThumbnails + "/routing/admin/api.js");

var compression = require("compression");
var User = require(pathThumbnails + "/models/user.js");
var url = "mongodb://" + mongo_db_cred.host + "/" + mongo_db_cred.users;
mongoose.connect(url);

app.engine("handlebars", hbs.engine);
app.set("view engine", "handlebars");
app.use(compression({ filter: shouldCompress }));

function shouldCompress(req, res) {
  if (req.headers["x-no-compression"]) {
    // don't compress responses with this request header
    return false;
  }

  // fallback to standard filter function
  return compression.filter(req, res);
}
app.set("trust proxy", "127.0.0.1");

var bodyParser = require("body-parser");
var cookieParser = require("cookie-parser");
var referrerPolicy = require("referrer-policy");
var helmet = require("helmet");
var featurePolicy = require("feature-policy");
app.use(
  featurePolicy({
    features: {
      fullscreen: ["*"],
      //vibrate: ["'none'"],
      payment: ["'none'"],
      microphone: ["'none'"],
      camera: ["'none'"],
      speaker: ["*"],
      syncXhr: ["'self'"]
      //notifications: ["'self'"]
    }
  })
);
app.use(
  helmet({
    frameguard: false
  })
);
app.use(referrerPolicy({ policy: "origin-when-cross-origin" }));
app.enable("view cache");
app.set("views", publicPath);
app.use(bodyParser.json()); // to support JSON-encoded bodies
app.use(
  bodyParser.urlencoded({
    extended: true
  })
);
app.use(
  session({
    secret: mongo_db_cred.secret,
    resave: true,
    saveUninitialized: true,
    store: new MongoStore({
      url: url,
      useNewUrlParser: true,
      collection: "sessions",
      ttl: mongo_db_cred.expire
    })
  })
); // session secret
app.use(passport.initialize());
app.use(passport.session()); // persistent login sessions

//app.use('/assets', express.static(publicPath + '/assets'));

passport.serializeUser(function(user, done) {
  done(null, user.id);
});

// used to deserialize the user
passport.deserializeUser(function(id, done) {
  User.findById(id, function(err, user) {
    done(err, user);
  });
});

passport.use(
  "local-signup",
  new LocalStrategy(
    {
      // by default, local strategy uses username and password, we will override with username
      usernameField: "username",
      passwordField: "password",
      passReqToCallback: true // allows us to pass back the entire request to the callback
    },
    function(req, username, password, done) {
      // asynchronous
      // User.findOne wont fire unless data is sent back
      process.nextTick(function() {
        // find a user whose username is the same as the forms username
        // we are checking to see if the user trying to login already exists
        var token = req.body.token;
        token_db
          .collection("tokens")
          .find({ token: token }, function(err, docs) {
            if (docs.length == 1) {
              token_db
                .collection("tokens")
                .remove({ token: token }, function(err, docs) {
                  User.findOne({ username: username }, function(err, user) {
                    // if there are any errors, return the error
                    if (err) return done(err);

                    // check to see if theres already a user with that username
                    if (user) {
                      return done(null, false);
                    } else {
                      // if there is no user with that username
                      // create the user
                      var newUser = new User();

                      // set the user's local credentials
                      newUser.username = username;
                      newUser.password = newUser.generateHash(password);

                      // save the user
                      newUser.save(function(err) {
                        if (err) throw err;
                        return done(null, newUser);
                      });
                    }
                  });
                });
            } else {
              return done(null, false);
            }
          });
      });
    }
  )
);

passport.use(
  "local-login",
  new LocalStrategy(
    {
      // by default, local strategy uses username and password, we will override with email
      usernameField: "username",
      passwordField: "password",
      passReqToCallback: true // allows us to pass back the entire request to the callback
    },
    function(req, username, password, done) {
      // callback with email and password from our form

      // find a user whose email is the same as the forms email
      // we are checking to see if the user trying to login already exists
      User.findOne({ username: username }, function(err, user) {
        // if there are any errors, return the error before anything else
        if (err) return done(err);

        // if no user is found, return the message
        if (!user) return done(null, false); // req.flash is the way to set flashdata using connect-flash

        // if the user is found but the password is wrong
        if (!user.validPassword(password)) return done(null, false); // create the loginMessage and save it to session as flashdata

        // all is well, return successful user

        return done(null, user);
      });
    }
  )
);

app.post(
  "/signup",
  passport.authenticate("local-signup", {
    successRedirect: "/", // redirect to the secure profile section
    failureRedirect: "/signup", // redirect back to the signup page if there is an error
    failureFlash: true // allow flash messages
  })
);

app.post(
  "/login",
  passport.authenticate("local-login", {
    successRedirect: "/", // redirect to the secure profile section
    failureRedirect: "/login#failed", // redirect back to the signup page if there is an error
    failureFlash: true // allow flash messages
  })
);

app.use("/login", isLoggedInTryingToLogIn, function(req, res) {
  var data = {
    where_get: "not_authenticated"
  };

  res.render("layouts/admin/not_authenticated", data);
});

app.use("/signup", isLoggedInTryingToLogIn, function(req, res) {
  var data = {
    where_get: "not_authenticated"
  };

  res.render("layouts/admin/not_authenticated", data);
});

app.use("/", api);

app.use("/logout", function(req, res) {
  req.logout();
  res.redirect("/login");
});

app.use("/assets/admin/authenticated", function(req, res, next) {
  if (!req.isAuthenticated()) {
    res.sendStatus(403);
    return;
  }
  return next();
});

app.use("/assets", express.static(publicPath + "/assets"));

app.use("/", isLoggedIn, function(req, res) {
  var data = {
    where_get: "authenticated",
    year: new Date().getYear() + 1900
  };

  res.render("layouts/admin/authenticated", data);
});

function isLoggedInTryingToLogIn(req, res, next) {
  if (!req.isAuthenticated()) {
    return next();
  }
  res.redirect("/");
}

function isLoggedIn(req, res, next) {
  if (req.isAuthenticated()) return next();
  res.redirect("/login");
}

//app.listen(default_port);

module.exports = app;