"use strict";

const express = require("express"),
  config = require("config"),
  LdapAuth = require("ldapauth-fork"),
  crypto = require("crypto");

const router = express.Router();

let userDB;


let ldap;
if (config.has("ldap.url")) {
  ldap = new LdapAuth(config.get("ldap"));
} else {
  ldap = null;
}

require("../db/users").then(function(db) {
  userDB = db;
});

router.get("/", function(req, res/*, next*/) {
  if (req.session.user) {
    return res.status(200).send(req.session.user);
  }
  return res.status(200).send({});
});

function ldapPromise(username, password) {
  if (!ldap) {
    return Promise.reject("LDAP not being used");
  }
  return new Promise(function(resolve, reject) {
    ldap.authenticate(username, password, function(error, user) {
      if (error) {
        return reject(error);
      }
      return resolve(user);
    });
  });
}

router.post("/create", function(req, res) {
  let username = req.query.u || req.body.u || "",
    password = req.query.p || req.body.p || "",
    name = req.query.n || req.body.n || username,
    mail = req.query.m || req.body.m;

  if (!username || !password || !mail || !name) {
    return res.status(400).send("Missing user id, name, password, and/or email");
  }

  let query = "SELECT * FROM users WHERE uid=:username";
  return userDB.sequelize.query(query, {
    replacements: {
      username: username
    },
    type: userDB.Sequelize.QueryTypes.SELECT
  }).then(function(results) {
    if (results.length != 0) {
      return res.status(400).send("Username already exists.");
    }

    return userDB.sequelize.query("INSERT INTO users " + 
        "(uid,displayName,password,mail,memberSince,authenticated) " +
        "VALUES(:username,:name,:password,:mail,CURRENT_TIMESTAMP,0)", {
      replacements: {
        username: username,
        name: name,
        password: crypto.createHash('sha256').update(password).digest('base64'),
        mail: mail
      }
    }).then(function(results) {
/*
      req.session.user = {
        name: name,
        mail: mail,
        username: username,
      };
      return res.status(200).send(req.session.user);
*/
      req.session.user = {};
      return res.status(401).send("Account has not been authenticated.");
    });
  });
});

router.post("/login", function(req, res) {
  let username = req.query.u || req.body.u || "",
    password = req.query.p || req.body.p || "";

  console.log("Login attempt");

  if (!username || !password) {
    return res.status(400).send("Missing username and/or password");
  }

  /* We use LDAP as the primary authenticator; if the user is not
   * found there, we look them up in the site-specific user database */
   
  return ldapPromise(username, password).then(function(user) {
    user.authenticated = 1;
    return user;
  }).catch(function() {
    console.log("User not found in LDAP. Looking up in DB.");
    let query = "SELECT * FROM users WHERE uid=:username AND password=:password";
    return userDB.sequelize.query(query, {
      replacements: {
        username: username,
        password: crypto.createHash('sha256').update(password).digest('base64')
      },
      type: userDB.Sequelize.QueryTypes.SELECT
    }).then(function(users) {
      if (users.length != 1) {
        return null;
      }
      return users[0];
    });
  }).then(function(user) {
    if (!user) {
      console.log(username + " not found.");
      req.session.user = {};
      return res.status(401).send("Invalid login credentials");      
    }

    if (!user.authenticated) {
      console.log(username + " not authenticated.");
      req.session.user = {};
      return res.status(401).send("Account has not been authenticated.");
    }

    console.log("Logging in as " + user.displayName);

    req.session.user = {
      name: user.displayName,
      mail: user.mail,
      username: user.uid
    };

    return res.status(200).send(req.session.user);
  });
});

router.get("/logout", function(req, res) {
  if (req.session && req.session.user) {
    req.session.user = {};
  }
  res.status(200).send(req.session.user);
});

module.exports = router;