snipe-it/app/Models/Depreciable.php

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2016-03-25 01:18:05 -07:00
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
use App\Models\Depreciation;
class Depreciable extends Model
{
/**
* Depreciation Relation, and associated helper methods
*/
//REQUIRES a purchase_date field
// and a purchase_cost field
//REQUIRES a get_depreciation method,
//which will return the deprecation.
//this is needed because assets get
//their depreciation from a model,
//whereas licenses have deprecations
//directly associated with them.
//assets will override the following
//two methods in order to inherit from
//their model instead of directly (like
//here)
public function depreciation()
{
return $this->belongsTo('\App\Models\Depreciation', 'depreciation_id');
}
public function get_depreciation()
{
return $this->depreciation;
}
/**
* @return float|int
*/
public function getDepreciatedValue()
{
if (!$this->get_depreciation()) { // will never happen
return $this->purchase_cost;
}
if ($this->get_depreciation()->months <= 0) {
return $this->purchase_cost;
}
// fraction of value left
$months_remaining = $this->time_until_depreciated()->m + 12*$this->time_until_depreciated()->y; //UGlY
$current_value = round(($months_remaining/ $this->get_depreciation()->months) * $this->purchase_cost, 2);
if ($current_value < 0) {
$current_value = 0;
}
return $current_value;
}
public function time_until_depreciated()
{
// @link http://www.php.net/manual/en/class.datetime.php
$d1 = new \DateTime();
$d2 = $this->depreciated_date();
// @link http://www.php.net/manual/en/class.dateinterval.php
$interval = $d1->diff($d2);
if (!$interval->invert) {
return $interval;
} else {
return new \DateInterval("PT0S"); //null interval (zero seconds from now)
}
}
public function depreciated_date()
{
$date = date_create($this->purchase_date);
date_add($date, date_interval_create_from_date_string($this->get_depreciation()->months . ' months'));
return $date; //date_format($date, 'Y-m-d'); //don't bake-in format, for internationalization
}
}