includes/splitter.inc

   1 <?php
   2 require_once($path_to_root.'/'.'includes/date_functions.inc');
   3 class Split {
   4         public $start_date;
   5         public $end_date;
   6         public $quantity=0;
   7         public $quantity_dispatched=0;
   8
   9
  10         function __construct($start_date, $period=null) {
  11                         $this->start_date = $start_date;
  12                         $this->end_date = $start_date;
  13                         if($period) $this->extend($period);
  14         }
  15
  16         function extend($days) {
  17                         $this->end_date = add_days($this->end_date, $days);
  18         }
  19 }
  20
  21 class Splitter {
  22         public $detail_ids = array() ;
  23         public $start_date;
  24         public $end_date;
  25         protected $days;
  26         public $max_quantity;
  27
  28         public function __construct(array $data) {
  29                 $this->details_id = array();
  30                 foreach($data['detail'] as $detail_id => $detail) {
  31                         array_push($this->details_id, $detail_id);
  32                 }
  33                 $this->start_date = $data['start_date'];
  34                 $this->end_date = $data['end_date'];
  35                 $this->days = date_diff2($this->end_date, $this->start_date, 'd');
  36
  37                 $this->max_quantity = $data['max_quantity'];
  38         }
  39
  40         protected function loadDetail($detail_id) {
  41                 $sql = "SELECT *
  42                                                 FROM ".TB_PREF."sales_order_details
  43                                                 WHERE id = $detail_id";
  44                 $result = db_query($sql);
  45                 return db_fetch($result);
  46         }
  47
  48         public function splitAll() {
  49                 foreach($this->detail_ids as $detail_id) {
  50                                 $detail = $this->loadDetail($detail_id);
  51                                 $splits = $this->split($detail);
  52                                 $this->saveSplits($detail, $splits);
  53                 }
  54         }
  55
  56         public function days() {
  57                 return $this->days;
  58         }
  59
  60
  61
  62         /* This function splits on order detail in bits of a specified size.
  63  * Each split  starting at the end time of the previous one.
  64  * the first split starts at the start_date and ends at the end_date.
  65  * The 'splitting' split the whole quantity not only the quantity left to dispatch
  66  * However, fully dispatched split won't be split in real, but merged with the next one
  67  */
  68         public function split($row) {
  69                 $splits = array();
  70                 $quantity = $row['quantity'];
  71                 $quantity_sent = $row['qty_sent'];
  72
  73                 if($quantity >= $quantity_sent) return $splits;
  74                 if(($quantity-$quantity_sent) % $this->max_quantity < $this->max_quantity) return;
  75
  76                 // determine the number of split needed. This will give us the lenght of a split.
  77                 $nsplit = ceiling($initial_quantity/$this->max_quantity);
  78                 if($nsplit == 1) return $splits;
  79
  80                 $period = $this->days/$nsplit;
  81
  82                 array_push($splits, $split = new Split($start_date, $period));
  83                 $split->quantity_dispatched = $quantity_dispatched;
  84                 $split_quantity = min($quantity, $this->max_quantity);
  85                 while($split_quantity > 0) {
  86                                         $split->quantity += $split_quantity;
  87                                 // Check if the split has been entirely dispatch or not.
  88                                 if($split->$quantity_dispatched > $split->quantity) {
  89                                         //extend the split
  90                                         $split->extend($period);
  91                                 }
  92                                 else {
  93                                         // create a new split
  94                                         array_push($splits, $split = new Split($split->end_date, $period));
  95
  96                                 }
  97                                 $quantity -= $split_quantity;
  98                                 $split_quantity = min($quantity, $this->max_quantity);
  99                 }
 100
 101                 return $splits;
 102         }
 103
 104 }
 105 ?>