Kundenkarte

kk.js

var ENTRYLIMIT = 148;

Function.prototype.method = function(name,func){
    this.prototype[name] = func;
    return this;
};

Array.method('find', function(value){
    for(var i = 0; i < this.length; i++) {
        if(this[i] >= value){
            return i;
        }
    }
    return this.length;
});

Array.method('split', function(value){
    i = this.find(value);
    return [[this.slice(0,i)], [this.slice(i,this.length)]]
});

Array.method('desc', function(){
    return this.sort(function(a,b){return b-a});
});

Array.method('asc', function(){
    return this.sort(function(a,b){return a-b});
});

Array.method('sum', function(){
  return this.reduceRight(function(a,b){return a+b});
});

var removeImposibleValues = function(array){
    this.array = array.desc();
    var first = array[0];
    for(var i = array.length; i > 1; i--){
        if((first + array[i]) < ENTRYLIMIT){
            array.splice(i,1);
        }
    }
    return array;
}

var magicArrayCalculator = function(array){
    var result = [];
    this.array    = removeImposibleValues(array);
    var a = array.slice(0,(array.length/2));
    var b = array.slice((array.length/2),array.length);
  b = b.asc();
    for(var i = 0; i < a.length; i++){
        var addition = a[i] + b[i];
        if(addition >= ENTRYLIMIT){
            result.push(a[i] + b[i]);
        }
    }
    return result;
}

var Sale = function(articles) {
    var sum = articles.sum();
    var positions = articles.split(ENTRYLIMIT);
    var card = new Card;
    var entries = magicArrayCalculator(positions[0][0]);
    card.write_entries(entries);
    card.write_entries(positions[1][0]);

  var nice = sum - card.get_sum();
  card.add_to_last_entry(nice);

    return {
        get_card : function(){
            return card;
        }
    }
};

var Card = function(){
    var positions = new Array();
    return {
        write_entries : function(entries){
            for(var i = 0; i < entries.length; i++){
    	positions.push(entries[i]);		
            }
        },
    add_to_last_entry : function(value){
      var temp = positions[positions.length - 1] 
      positions[positions.length - 1] = value + temp;
    },
    get_positions : function(){
      return positions.desc();
    },
    get_sum : function(){
      return positions.sum();
    },
        to_string : function(){
      var string = "";
      positions = positions.desc();
      for(var i = 0; i < positions.length; i++){
        string += "amount" + (i + 1) + "=" + positions[i] + "&";
      }
      return string.substring(0, string.length - 1);
        }
     }
};