First commit

packages/mmt/ddd-shared-kernel/ValueObjects/Email.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+use InvalidArgumentException;
+
+final class Email extends ValueObject
+{
+    public function __construct(
+        public private(set) string $email
+    )
+    {
+        $this->email = trim(mb_strtolower($email));
+
+        if (!filter_var($this->email, FILTER_VALIDATE_EMAIL)) {
+            throw new InvalidArgumentException("Invalid email format");
+        }
+    }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/FixedCommission.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+use MMT\DDDSharedKernel\Interfaces\Commission;
+
+class FixedCommission extends Commission
+{
+    public function __construct(
+        public private(set) Money $value
+    )
+    {
+        if($value->isNegative()) {
+            throw new \InvalidArgumentException('The amount of a commission cannot be negative');
+        }
+    }
+
+    public function applyTo(?Money $money = null): Money
+    {
+        return $this->value;
+    }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/Money.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+final class Money extends ValueObject
+{
+
+    public function __construct(
+        public private(set) int $amount,
+        public private(set) string $currency
+    )
+    {
+
+    }
+
+    public function __toString() : string
+    {
+        $amount = $this->toFloat();
+
+        return $this->isPositive()
+            ? "{$this->currency} {$amount}"
+            : "-{$this->currency} {-$amount}";
+    }
+
+    public function toFloat() : float
+    {
+        return round($this->amount /100, 2);
+    }
+
+    public function formatted() : string
+    {
+        $amount = $this->toFloat();
+
+        return $this->isPositive()
+            ? "\${$amount}"
+            : "-\${-$amount}"; 
+    }
+
+    public function isPositive() : bool
+    {
+        return $this->amount >= 0;
+    }
+
+    public function isNegative() : bool
+    {
+        return $this->amount < 0;
+    }
+
+    public function isZero() : bool
+    {
+        return $this->amount === 0;
+    }
+
+    public function greaterThan(Money $other) : bool
+    {
+        return $this->amount > $other->amount;
+    }
+
+    public function greaterThanOrEqual(Money $other) : bool
+    {
+        return $this->amount >= $other->amount;
+    }
+
+    public function lessThan(Money $other) : bool
+    {
+        return $this->amount < $other->amount;
+    }
+
+    public function lessThanOrEqual(Money $other) : bool
+    {
+        return $this->amount <= $other->amount;
+    }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/Percentage.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+final class Percentage extends ValueObject
+{
+    public function __construct(
+        public private(set) int $value
+    ) {
+        if ($value < 0 || $value > 100) {
+            throw new \InvalidArgumentException("Percentage must be 0-100");
+        }
+    }
+
+    public function asFloat(): float
+    {
+        return $this->value / 100;
+    }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/PercentageCommission.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+use MMT\DDDSharedKernel\Interfaces\Commission;
+
+final class PercentageCommission extends Commission
+{
+    public function __construct(
+        public private(set) int $value
+    )
+    {
+        if($value < 0) {
+            throw new \InvalidArgumentException('The amount of a commission cannot be negative');
+        }
+
+        if($value > 100) {
+            throw new \InvalidArgumentException('The amount commission cannot be exceed 100 when the commission is based on a percentage');
+        }
+    }
+
+    public function applyTo(Money $money): Money
+    {
+        $finalCommissionInCents = $money->amount * $this->value / 100;
+        return new Money($finalCommissionInCents, $money->currency);
+    }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/PositiveMoney.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+class PositiveMoney extends ValueObject
+{
+    public function __construct(
+        private Money $money
+    )
+    {
+        if($this->money->isNegative()) {
+            throw new \InvalidArgumentException("The value cannot be negative");
+        }
+    }
+
+    public function greaterThan(PositiveMoney $positiveMoney): bool
+    {
+        return $this->money->greaterThan($positiveMoney->money);
+    }
+
+    public function greaterThanOrEqual(PositiveMoney $positiveMoney): bool
+    {
+        return $this->money->greaterThanOrEqual($positiveMoney->money);
+    }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/Price.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+class Price extends ValueObject
+{
+    public function __construct(
+        private Money $money
+    )
+    {
+        if($this->money->isNegative()) {
+            throw new \InvalidArgumentException("The price cannot be negative");
+        }
+    }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/UID.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+final class UID extends ValueObject
+{
+    public function __construct(
+        public private(set) int $value
+    ) { }
+}

packages/mmt/ddd-shared-kernel/ValueObjects/ValueObject.php

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+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+class ValueObject
+{
+    
+}