1 | <?php |
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2 | |||
3 | namespace SilverShop\Cart; |
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4 | |||
5 | use ErrorException; |
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6 | use Exception; |
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7 | use Monolog\Logger; |
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8 | use SilverShop\Model\Order; |
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9 | use SilverStripe\Core\ClassInfo; |
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10 | use SilverStripe\Core\Injector\Injectable; |
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11 | use SilverStripe\ORM\DB; |
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12 | |||
13 | /** |
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14 | * Handles the calculation of order totals. |
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15 | * |
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16 | * Creates (if necessary) and calculates values for each modifier, |
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17 | * and subsequently the total of the order. |
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18 | * Caches to prevent recalculation, unless dirty. |
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19 | */ |
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20 | class OrderTotalCalculator |
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21 | { |
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22 | use Injectable; |
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23 | |||
24 | private static $dependencies = [ |
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25 | 'logger' => '%$SilverShop\Logger', |
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26 | ]; |
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27 | |||
28 | /** |
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29 | * @var Logger |
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30 | */ |
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31 | public $logger; |
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32 | |||
33 | /** |
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34 | * @var Order |
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35 | */ |
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36 | protected $order; |
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37 | |||
38 | function __construct(Order $order) |
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39 | { |
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40 | $this->order = $order; |
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41 | } |
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42 | |||
43 | /** |
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44 | * @return float |
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45 | * @throws Exception |
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46 | * @throws \Psr\Container\NotFoundExceptionInterface |
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47 | */ |
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48 | function calculate() |
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49 | { |
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50 | $runningtotal = $this->order->SubTotal(); |
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51 | $sort = 1; |
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52 | $existingmodifiers = $this->order->Modifiers(); |
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53 | |||
54 | $modifierclasses = Order::config()->modifiers; |
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55 | |||
56 | //check if modifiers are even in use |
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57 | if (!is_array($modifierclasses) || empty($modifierclasses)) { |
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58 | return $runningtotal; |
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59 | } |
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60 | |||
61 | $modifierclasses = array_unique($modifierclasses); |
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62 | |||
63 | if (DB::get_conn()->supportsTransactions()) { |
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64 | DB::get_conn()->transactionStart(); |
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65 | } |
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66 | |||
67 | set_error_handler( |
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68 | function ($severity, $message, $file, $line) { |
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69 | throw new ErrorException($message, 0, $severity, $file, $line); |
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70 | }, |
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71 | E_ALL & ~(E_STRICT | E_NOTICE) |
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72 | ); |
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73 | |||
74 | try { |
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75 | foreach ($modifierclasses as $ClassName) { |
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76 | if ($modifier = $this->getModifier($ClassName)) { |
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77 | $modifier->Sort = $sort; |
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78 | $runningtotal = $modifier->modify($runningtotal); |
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79 | if ($modifier->isChanged()) { |
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80 | $modifier->write(); |
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81 | } |
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82 | } |
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83 | $sort++; |
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84 | } |
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85 | //clear old modifiers out |
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86 | if ($existingmodifiers) { |
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87 | foreach ($existingmodifiers as $modifier) { |
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88 | if (!in_array($modifier->ClassName, $modifierclasses)) { |
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89 | $modifier->delete(); |
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90 | $modifier->destroy(); |
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91 | } |
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92 | } |
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93 | } |
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94 | } catch (Exception $ex) { |
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95 | // Rollback the transaction if an error occurred |
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96 | if (DB::get_conn()->supportsTransactions()) { |
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97 | DB::get_conn()->transactionRollback(); |
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98 | } |
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99 | // throw the exception after rollback |
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100 | throw $ex; |
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101 | } finally { |
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102 | // restore the error handler, no matter what |
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103 | restore_error_handler(); |
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104 | } |
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105 | |||
106 | // Everything went through fine, complete the transaction |
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107 | if (DB::get_conn()->supportsTransactions()) { |
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108 | DB::get_conn()->transactionEnd(); |
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109 | } |
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110 | |||
111 | //prevent negative sales from ever occurring |
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112 | if ($runningtotal < 0) { |
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113 | $this->logger->error( |
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114 | "Order (ID = {$this->order->ID}) was calculated to equal $runningtotal.\n |
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115 | Order totals should never be negative!\n |
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116 | The order total was set to $0" |
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117 | ); |
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118 | |||
119 | $runningtotal = 0; |
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120 | } |
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121 | |||
122 | return $runningtotal; |
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123 | } |
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124 | |||
125 | /** |
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126 | * Retrieve a modifier of a given class for the order. |
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127 | * Modifier will be retrieved from database if it already exists, |
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128 | * or created if it is always required. |
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129 | * |
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130 | * @param string $className |
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131 | * @param boolean $forcecreate - force the modifier to be created. |
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132 | */ |
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133 | public function getModifier($className, $forcecreate = false) |
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134 | { |
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135 | if (!ClassInfo::exists($className)) { |
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136 | user_error("Modifier class \"$className\" does not exist."); |
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137 | } |
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138 | //search for existing |
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139 | $modifier = $className::get() |
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140 | ->filter("OrderID", $this->order->ID) |
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141 | ->first(); |
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142 | if ($modifier) { |
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143 | //remove if no longer valid |
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144 | if (!$modifier->valid()) { |
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145 | //TODO: need to provide feedback message - why modifier was removed |
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146 | $modifier->delete(); |
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147 | $modifier->destroy(); |
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148 | return null; |
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149 | } |
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150 | return $modifier; |
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151 | } |
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152 | $modifier = new $className(); |
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153 | if ($modifier->required() || $forcecreate) { //create any modifiers that are required for every order |
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154 | $modifier->OrderID = $this->order->ID; |
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155 | $modifier->write(); |
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156 | $this->order->Modifiers()->add($modifier); |
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157 | |||
158 | return $modifier; |
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159 | } |
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160 | |||
161 | return null; |
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162 | } |
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163 | } |
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164 |