const PassportLocalStrategy = require('passport-local').Strategy;
const logger = require('winston');

module.exports = (db) => {
  const returnUserAndChannelInfo = (userInstance) => {
    return new Promise((resolve, reject) => {
      let userInfo = {};
      userInfo['id'] = userInstance.id;
      userInfo['userName'] = userInstance.userName;
      userInstance
        .getChannel()
        .then(({channelName, channelClaimId}) => {
          userInfo['channelName'] = channelName;
          userInfo['channelClaimId'] = channelClaimId;
          return db.Certificate.getShortChannelIdFromLongChannelId(channelClaimId, channelName);
        })
        .then(shortChannelId => {
          userInfo['shortChannelId'] = shortChannelId;
          resolve(userInfo);
        })
        .catch(error => {
          reject(error);
        });
    });
  };

  return new PassportLocalStrategy(
    {
      usernameField: 'username',
      passwordField: 'password',
    },
    (username, password, done) => {
      return db.User
        .findOne({
          where: {userName: username},
        })
        .then(user => {
          if (!user) {
            logger.debug('no user found');
            return done(null, false, {message: 'Incorrect username or password'});
          }
          return user.comparePassword(password)
            .then(isMatch => {
              if (!isMatch) {
                logger.debug('incorrect password');
                return done(null, false, {message: 'Incorrect username or password'});
              }
              logger.debug('Password was a match, returning User');
              return returnUserAndChannelInfo(user)
                .then(userInfo => {
                  return done(null, userInfo);
                })
                .catch(error => {
                  return error;
                });
            })
            .catch(error => {
              return error;
            });
        })
        .catch(error => {
          return done(error);
        });
    },
  );
};