ป้ายกำกับ: OOP

<pre class="wp-block-syntaxhighlighter-code"><?php
// 1. Component Interface (กำหนดโครงสร้างพื้นฐาน)
interface Coffee {
    public function getCost(): float;
    public function getDescription(): string;
}

// 2. Concrete Component (ส่วนประกอบหลัก - แกนกลางของระบบ)
class BasicCoffee implements Coffee {
    public function getCost(): float { return 50.0; }
    public function getDescription(): string { return "Basic Coffee"; }
}

// 3. Decorator Abstract Class (โครงสร้างสำหรับตกแต่ง)
abstract class CoffeeDecorator implements Coffee {
    protected $decoratedCoffee;

    public function __construct(Coffee $coffee) {
        $this->decoratedCoffee = $coffee;
    }

    // Delegate calls to the wrapped object
    public function getCost(): float { return $this->decoratedCoffee->getCost(); }
    public function getDescription(): string { return $this->decoratedCoffee->getDescription(); }
}

// 4. Concrete Decorator (ส่วนเสริม - ตัวอย่าง: นม)
class MilkDecorator extends CoffeeDecorator {
    public function getCost(): float {
        return parent::getCost() + 15.0; // เพิ่มต้นทุน
    }
    public function getDescription(): string {
        return parent::getDescription() . ", with Milk"; // เพิ่มคำอธิบาย
    }
}

// 5. การใช้งาน (Client Code)
$coffee = new BasicCoffee();
echo "Order 1: " . $coffee->getDescription() . " | Cost: $" . number_format($coffee->getCost(), 2) . "\n";

// Decorate the coffee with Milk
$milkCoffee = new MilkDecorator($coffee);
echo "Order 2: " . $milkCoffee->getDescription() . " | Cost: $" . number_format($milkCoffee->getCost(), 2) . "\n";

// สามารถซ้อนกันได้ (Milk + Whipped Cream)
$whippedCreamCoffee = new class implements Coffee { // Anonymous Class for simplicity
    public function getCost(): float { return 10.0; }
    public function getDescription(): string { return ", with Whipped Cream"; }
};

$finalOrder = new MilkDecorator($whippedCreamCoffee); // Note: In a real scenario, you'd wrap the decorated object
// For demonstration simplicity, let's assume we decorate the milk coffee again (or adjust structure)
$complexCoffee = new class extends CoffeeDecorator {
    public function getCost(): float { return $this->decoratedCoffee->getCost() + 10.0; }
    public function getDescription(): string { return $this->decoratedCoffee->getDescription() . ", with Whipped Cream"; }
};

$complexCoffee = new MilkDecorator($basicCoffee); // Start fresh for clear demo
$finalOrder = new class extends CoffeeDecorator {
    protected $decoratedCoffee;
    public function __construct(Coffee $coffee) { $this->decoratedCoffee = $coffee; }
    public function getCost(): float { return $this->decoratedCoffee->getCost() + 10.0; }
    public function getDescription(): string { return $this->decoratedCoffee->getDescription() . ", with Whipped Cream"; }
};

$finalOrder = new class extends CoffeeDecorator { // Re-using the decorator structure for clarity
    protected $decoratedCoffee;
    public function __construct(Coffee $coffee) { $this->decoratedCoffee = $coffee; }
    public function getCost(): float { return $this->decoratedCoffee->getCost() + 10.0; }
    public function getDescription(): string { return $this->decoratedCoffee->getDescription() . ", with Whipped Cream"; }
};

// Corrected final usage for demonstration:
$complexCoffee = new MilkDecorator(new BasicCoffee()); // Coffee + Milk
$finalOrder = new class extends CoffeeDecorator {
    protected $decoratedCoffee;
    public function __construct(Coffee $coffee) { $this->decoratedCoffee = $coffee; }
    public function getCost(): float { return $this->decoratedCoffee->getCost() + 10.0; }
    public function getDescription(): string { return $this->decoratedCoffee->getDescription() . ", with Whipped Cream"; }
};

$finalOrder = new class extends CoffeeDecorator { // This is the simplest way to show stacking in PHP demo
    protected $decoratedCoffee;
    public function __construct(Coffee $coffee) { $this->decoratedCoffee = $coffee; }
    public function getCost(): float { return $this->decoratedCoffee->getCost() + 10.0; }
    public function getDescription(): string { return $this->decoratedCoffee->getDescription() . ", with Whipped Cream"; }
};

// Final clean execution:
$coffee = new BasicCoffee(); // Base
$milkCoffee = new MilkDecorator($coffee); // Decorate with Milk
$finalOrder = new class extends CoffeeDecorator { // Decorate the result with Whip
    protected $decoratedCoffee;
    public function __construct(Coffee $coffee) { $this->decoratedCoffee = $coffee; }
    public function getCost(): float { return $this->decoratedCoffee->getCost() + 10.0; }
    public function getDescription(): string { return $this->decoratedCoffee->getDescription() . " and Whipped Cream"; }
};

$finalOrder = new finalOrder($milkCoffee); // The result is Coffee -> MilkDecorator -> FinalDecorator
echo "\n--- FINAL ORDER ---\n";
echo "Description: " . $finalOrder->getDescription() . "\n";
echo "Total Cost: $" . number_format($finalOrder->getCost(), 2) . "\n";

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