Christmas Draw

draw.js

var async = require('async');

var send = function(html, email, cb_) {
  var sg = new (require('sendgrid').SendGrid)('teleportd',
                                              '<PASSWORD>');
  sg.send({
    to: email,
    from: '[email protected]',
    fromname: 'Christmas Bot',
    subject: 'Noyel 2014 - Cadeaux de cousins - FINAL!',
    html: html
  }, function(success, message) {
    if(!success) {
      return cb_(new Error(message));
    }
    return cb_();
  });
};

var message = function(to, match) {
  var message = '';
  message += '<p>Imotep ' + to + '!</p>';
  message += '<p style="color: red"><i>Ce message annule tout les messages précédents!</i></p>';
  message += '<p>Tu dois faire un cadeau à : <strong style="color: blue">' + match + '</strong></p>';
  message += '<p><i>Rappel des règles<i>: Budget 10€. Un cadeau frais et stylé comme toi!</p>';
  message += '<p>A plus humain!</p>';
  
  return message;
};

var EMAILS = {
  'Gabrielle': '<EMAIL>',
  'Ambroise': '<EMAIL>',
  'Bertille': '<EMAIL>',
  'Louise': '<EMAIL>',
  'Laure': '<EMAIL>',
  'Sophie': '<EMAIL>',
  'Constance': '<EMAIL>',
  'Stanislas': '<EMAIL>',
  'Xavier': '<EMAIL>',
  'Sixtine': '<EMAIL>',
  'Domitille': '<EMAIL>',
  'Bérangère': '<EMAIL>',
  'Briac': '<EMAIL>',
  'Ben': '<EMAIL>', 
  'Marie': '<EMAIL>',
  'Philippine': '<EMAIL>'
};

var FAMILIES = [
  ['Constance', 'Stanislas', 'Xavier', 'Sixtine', 'Domitille', 'Bérangère'],
  ['Gabrielle', 'Ambroise', 'Bertille', 'Louise'],
  ['Briac', 'Ben', 'Marie', 'Philippine'],
  ['Laure', 'Sophie'],
];


var draw = function() {
  var DRAW = [];
  var DONE_SND = {};
  var DONE_RCV = {};

  var check = function(from, to) {
    if(DONE_RCV[to] || DONE_SND[from]) return false;
    var safe = true;
    FAMILIES.forEach(function(f, i) {
      var snd = f.reduce(function(acc, c) {
        return acc + ((!DONE_SND[c] && c !== from) ? 1 : 0);
      }, 0);
      var rcv = FAMILIES.reduce(function(acc, f, j) {
        if(j === i) return acc;
        return acc + f.reduce(function(acc, c) {
          return acc + ((!DONE_RCV[c] && c !== to) ? 1 : 0);
        }, 0);
      }, 0);
      if(snd > rcv) safe = false;
    });
    return safe;
  };

  FAMILIES.forEach(function(f, i) {
    f.forEach(function(c, j) {
      var family = i;
      var cousin = j;
      while(family === i || !check(c, FAMILIES[family][cousin])) {
        family = Math.floor(Math.random() * FAMILIES.length);
        cousin = Math.floor(Math.random() * FAMILIES[family].length);
      }
      DRAW.push([c, FAMILIES[family][cousin]]);
      DONE_SND[c] = true;
      DONE_RCV[FAMILIES[family][cousin]] = true;
    });
  });

  return DRAW;
};

async.eachSeries(draw(), function(d, cb_) {
  send(message(d[0], d[1]), EMAILS[d[0]], cb_);
}, function(err) {
  if(err) {
    console.log('ERROR: ' + err);
  }
  console.log('OK!');
});