yoanm / alfred-personal-assistant

server/rules.js

var express = require('express');

var extend  = require('extend');


// ------------------------------------------

//  CONSTRUCTOR

// ------------------------------------------


var init = function(){

  info('Starting RuleEngine ...');

  return RuleEngine;

}


// ------------------------------------------

//  SCRIPT

// ------------------------------------------


var dispatch = function(name, data, callback){

  // 1. Answer now to callback

  if (callback) { callback(data); }

  

  // 2. Then iterate on explicit rules

  iterate(name, data, 0);

}


var iterate = function(name, data, i){

  var options = data; // backward compatibility

  var rules = Config.rules;

  if (!rules){ return false; }

  

  for (; i < rules.length ; i++){

    try {

      var rule = rules[i];

      if (rule['disabled']){ continue; }

      if (rule['if'] != name){ continue; }

      if (rule['script']){ eval(decode(rule['script'])); }

      if (!rule['then']){ continue; }

      

      info('iterate ', i, rule);

      return SARAH.run(rule['then'], data, function(result){

        if (result) {

          // Handle speech

          SARAH.speak(result.tts);

          

          // Merge resutls

          extend(true, data, result);

        }

        

        // Recursive call

        iterate(name, data, i+1);

      });

      

    } catch(ex) { 

      warn('Rule %s:', name, rule, ex); 

      iterate(name, data, i+1);

    }

  }

}


var decode = function(str){

  if (!str){ return str; }

  return str.replace(/&quote;/g, '"').replace(/&#10;/g, '\n').trim();

}


// ------------------------------------------

//  SORTING MANAGER

// ------------------------------------------


var SEEK   = 1*60*3;  //  3 minutes

var SCOPE  = 1*60*10; // 10 minutes

var moment = require('moment'); moment.locale('fr');


var log = function(name, data){

  var now = moment();

  var day = moment().startOf('day');

  

  var entry        = {};

  entry.name       = name;

  entry.data       = data;

  entry.timeOfDay  = now.diff(day) / 1000;

  entry.dayOfWeek  = now.day();

  entry.dayOfMonth = now.date();

  entry.location   = 'house';

  entry.count      = 0;

  

  var i = indexOf(entry);

  if (i < 0){ 

    logs.push(entry); 

  } else {  

    entry = logs[i];

    entry.count++;

  }

  logs.sort(compare);

  

  return entry;

}


var indexOf = function(entry){

  for (var i = 0 ; i < logs.length; i++){

    if (compare(entry, logs[i]) == 0){ return i }

  }

  return -1;

}


var compare = function(x, y){

  var tod = x.timeOfDay  - y.timeOfDay;

  var dow = x.dayOfWeek  - y.dayOfWeek;

  var dom = x.dayOfMonth - y.dayOfMonth;

  var cnt = x.count - y.count;

  

  if (Math.abs(tod) < SCOPE ){

    if (x.name === y.name){ return 0; }

    var delta = (Math.abs(dom) + Math.abs(dow) + Math.abs(tod)) / ((Math.abs(cnt)+1) * SCOPE);

    if (dom != 0){ return dom>0 ? delta : -delta; }

    if (dow != 0){ return dow>0 ? delta : -delta; }

    if (cnt != 0){ return cnt>0 ? delta : -delta; }

    return tod>0 ? delta : -delta; //x.name.localeCompare(y.name); 

  }

  else { return tod; }

}


var next = function(entry){

  

  /*

  var i  = indexOf(entry);

  var d1 = 1000000;

  var e1 = undefined;

  

  var d2 = 1000000;

  var e2 = undefined;

  

  console.log(i,entry.name,'--------------------');

  for (var j in logs){

    console.log(j, logs[j].name);

  }

  

  if (i+1 < logs.length){

    e1 = logs[i+1];

    d1 = compare(e1, entry);

    console.log('i+1 <'+logs.length, e1.name, d1);

  }

  

  if (i-1 >= 0){

    e2 = logs[i-1];

    d2 = compare(entry, e2);

    console.log('i-1 >= 0', e2.name, d2);

  }

  

  return d1 < d2 ? e1 : e2;

  */

}


var logs = []

var getLogs = function(){

  return logs;

}



// ------------------------------------------

//  RULES

// ------------------------------------------


var getRules = function(ifname){

  

  // Set empty rules

  if (!Config.rules){

    Config.rules = [

      { "if": "before", "then": "", "script" : ""},

      { "if": "after",  "then": "", "script" : ""}

    ];

  }

  

  // Return all rules if there is no name

  if (!ifname){

    return Config.rules;

  }

  

  // Filter on name

  var tmp = [];

  for (var i in Config.rules){

    var rule = Config.rules[i];

    if (ifname == rule['if']){

      tmp.push(rule); 

    }

  }

  return tmp;

}


var save = function(body){

  if (!body['if']){ return; }

  

  var tmp = []

  for(var i in body['if']){

    var ifname = Helper.parse(body['if'][i]);

    if (!ifname) continue;

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

    

    tmp.push({

      "if" : ifname,

      "then" : Helper.parse(body['then'][i]),

      "script" : Helper.parse(body['script'][i]),

      "disabled" : Helper.parse(body['disabled'][i]),

    });

  }

  Config.rules = tmp;

  SARAH.ConfigManager.save();

}


// ------------------------------------------

//  ROUTER

// ------------------------------------------


var Router = express.Router();

Router.post('/portal/rules', function(req, res, next) {

  var name = req.body.opSave;

  if (name){ save(req.body); }

  res.redirect('/portal/rules');

});


Router.all('/rules/script', function(req, res, next) {

  res.render('rules/rules-script.ejs', {'title' : i18n('modal.rules.script')});

});


// ------------------------------------------

//  PUBLIC

// ------------------------------------------


var RuleEngine = {

  'init' : init,

  'dispatch': dispatch,

  'log': log,

  'next': next,

  'getLogs': getLogs,

  'getRules': getRules,

  'before': function(){ return getRules('before')[0] },

  'after' : function(){ return getRules('after')[0]  },

  'Router' : Router

}


// Exports Manager

exports.init = RuleEngine.init;