var express = require('express');
var router = express.Router();
var User = require('../models/User');

// Index // 1
router.get('/', function(req, res){
  User.find({})
    .sort({username:1})
    .exec(function(err, users){
      if(err) return res.json(err);
      res.render('users/index', {users:users});
    });
});

// New
router.get('/new', function(req, res){
  var user = req.flash('user')[0] || {};
  var errors = req.flash('errors')[0] || {};
  res.render('users/new', {user:user, errors:errors});
});

// create
router.post('/', function(req, res){
  User.create(req.body, function(err, user){
    if(err){
      req.flash('user', req.body);
      req.flash('errors', parseError(err));
      return res.redirect('/users/new');
    }
    res.redirect('/users');
  });
});

// show
router.get('/:username', function(req, res){
  User.findOne({username:req.params.username}, function(err, user){
    if(err) return res.json(err);
    res.render('users/show', {user:user});
  });
});

// edit
router.get('/:username/edit', function(req, res){
  var user = req.flash('user')[0];
  var errors = req.flash('errors')[0] || {};
  if(!user){
    User.findOne({username:req.params.username}, function(err, user){
      if(err) return res.json(err);
      res.render('users/edit', {username:req.params.username, user:user, errors:errors});
    });
  }
  else{
    res.render('users/edit', {username:req.params.username, user:user, errors:errors });
  }
});

// update
router.put('/:username', function(req, res, next){
  User.findOne({username:req.params.username}) // 2-1
    .select('password') // 2-2
    .exec(function(err, user){
      if(err) return res.json(err);

      // update user object
      user.originalPassword = user.password;
      user.password = req.body.newPassword? req.body.newPassword : user.password; // 2-3
      for(var p in req.body){ // 2-4
        user[p] = req.body[p];
      }

      // save updated user
      user.save(function(err, user){
        if(err){
          req.flash('user', req.body);
          req.flash('errors', parseError(err));
          return res.redirect('/users/'+req.params.username+'/edit');
        }
        res.redirect('/users/'+user.username);
      });
  });
});

// destroy
router.delete('/:username', function(req, res){
  User.deleteOne({username:req.params.username}, function(err){
    if(err) return res.json(err);
    res.redirect('/users');
  });
});

module.exports = router;

function parseError(errors){
  var parsed = {};
  if(errors.name == 'ValidationError'){
    for(var name in errors.errors){
      var validationError = errors.errors[name];
      parsed[name] = {message:validationError.message};
    }
  }
  else if(errors.code == '11000' && errors.errmsg.indexOf('username') > 0){
    parsed.username = {message:'Already exists!'};
  }
  else {
    parsed.unhandled = JSON.stringify(errors);
  }
  return parsed;
}