var debug = require('debug')('freecc:user:remote');
var blacklistedUsernames =
  require('../../server/utils/constants').blacklistedUsernames;

module.exports = function(User) {
  // NOTE(berks): user email validation currently not needed but build in. This
  // work around should let us sneak by
  // see:
  // https://github.com/strongloop/loopback/issues/1137#issuecomment-109200135
  delete User.validations.email;
  // set salt factor for passwords
  User.settings.saltWorkFactor = 5;

  // username should not be in blacklist
  User.validatesExclusionOf('username', {
    'in': blacklistedUsernames,
    message: 'is taken'
  });

  // username should be unique
  User.validatesUniquenessOf('username');

  debug('setting up user hooks');
  User.afterRemote('confirm', function(ctx) {
    ctx.req.flash('success', {
      msg: [
        'You\'re email has been confirmed!'
      ]
    });
    ctx.res.redirect('/email-signin');
  });

  User.afterRemote('login', function(ctx, user, next) {
    var res = ctx.res;
    var req = ctx.req;
    // var args = ctx.args;

    var accessToken = {};
    var config = {
      signed: !!req.signedCookies,
      maxAge: accessToken.ttl
    };
    if (accessToken && accessToken.id) {
      res.cookie('access_token', accessToken.id, config);
      res.cookie('userId', accessToken.userId, config);
    }
    debug('before pass login');
    return req.logIn(user, function(err) {
      if (err) {
        return next(err);
      }
      req.flash('success', { msg: 'Success! You are logged in.' });
      return res.redirect('/');
    });
  });

  User.afterRemoteError('login', function(ctx) {
    var res = ctx.res;
    var req = ctx.req;

    req.flash('errors', {
      msg: 'Invalid username or password.'
    });
    return res.redirect('/');
  });

  User.afterRemote('logout', function(ctx, result, next) {
    var res = ctx.result;
    res.clearCookie('access_token');
    res.clearCookie('userId');
    next();
  });

  User.doesExist = function doesExist(username, email, cb) {
    if (!username && !email) {
      return process.nextTick(function() {
        cb(null, false);
      });
    }
    debug('checking existence');

    // check to see if username is on blacklist
    if (username && blacklistedUsernames.indexOf(username) !== -1) {
      return cb(null, true);
    }

    var where = {};
    if (username) {
      where.username = username.toLowerCase();
    } else {
      where.email = email ? email.toLowerCase() : email;
    }
    debug('where', where);
    User.count(
      where,
      function(err, count) {
        if (err) {
          debug('err checking existance: ', err);
          return cb(err);
        }
        if (count > 0) {
          return cb(null, true);
        }
        return cb(null, false);
      }
    );
  };

  User.remoteMethod(
    'doesExist',
    {
      description: 'checks whether a user exists using email or username',
      accepts: [
        {
          arg: 'username',
          type: 'string'
        },
        {
          arg: 'email',
          type: 'string'
        }
      ],
      returns: [
        {
          arg: 'exists',
          type: 'boolean'
        }
      ],
      http: {
        path: '/exists',
        verb: 'get'
      }
    }
  );

  User.about = function about(username, cb) {
    if (!username) {
      // Zalgo!!
      return process.nextTick(() => {
        cb(
          new TypeError('FCC: username should be a string but got %s', username)
        );
      });
    }
    User.findOne({ where: { username } }, (err, user) => {
      if (err) {
        cb(err);
      }
      if (!user || user.username !== username) {
        cb(new Error('FCC: no user found for %s', username));
      }
      const aboutUser = {
        username: user.username,
        bio: user.bio,
        github: user.githubProfile
      };
      cb(null, aboutUser);
    });
  };

  User.remoteMethod(
    'about',
    {
      description: 'get public info about user',
      accepts: [
        {
          arg: 'username',
          type: 'string'
        }
      ],
      returns: [
        {
          arg: 'about',
          type: 'object'
        }
      ],
      http: {
        path: '/about',
        verb: 'get'
      }
    }
  );
};