removed cost calculation (do dynamically)

src/Plugin/Validation/Constraint/FieldWorkMachinesConstraint.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\farm_agrikern\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Provides a FieldWorkMachines constraint.
+ *
+ * @Constraint(
+ *   id = "AgriKernFieldWorkMachines",
+ *   label = @Translation("FieldWorkMachines", context = "Validation"),
+ * )
+ *
+ * @DCG
+ * To apply this constraint on third party entity types implement either
+ * hook_entity_base_field_info_alter() or hook_entity_bundle_field_info_alter().
+ *
+ * @see https://www.drupal.org/node/2015723
+ */
+final class FieldWorkMachinesConstraint extends Constraint {
+
+    public string $notUnique = 'Some machines were entered twice.';
+
+}

src/Plugin/Validation/Constraint/FieldWorkMachinesConstraintValidator.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\farm_agrikern\Plugin\Validation\Constraint;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+* Validates the FieldWorkMachines constraint.
+*/
+final class FieldWorkMachinesConstraintValidator extends ConstraintValidator {
+    
+    /**
+    * {@inheritdoc}
+    */
+    public function validate(mixed $items, Constraint $constraint): void {
+        if (!$items instanceof FieldItemListInterface) {
+            throw new \InvalidArgumentException(
+                sprintf('The validated value must be instance of \Drupal\Core\Field\FieldItemListInterface, %s was given.', get_debug_type($items))
+            );
+        }
+        $seen_machines = [];
+        foreach ($items as $delta => $item) {
+            $machine_usage = \Drupal::entityTypeManager()->getStorage('asset')->load($item->target_id);
+            $machine_id = $machine_usage->machine_field->target_id;
+            if (isset($seen_machines[$machine_id])) {
+                $this->context->buildViolation($constraint->notUnique)
+                ->atPath($delta)
+                ->addViolation();
+            }
+            $seen_machines[$machine_id] = true;
+        }
+    }
+    
+}

src/Plugin/Validation/Constraint/SubstanceIngredientsConstraint.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\farm_agrikern\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+* Provides a SubstanceIngredients constraint.
+*
+* @Constraint(
+*   id = "AgriKernSubstanceIngredients",
+*   label = @Translation("SubstanceIngredients", context = "Validation"),
+* )
+*
+* @DCG
+* To apply this constraint on third party entity types implement either
+* hook_entity_base_field_info_alter() or hook_entity_bundle_field_info_alter().
+*
+* @see https://www.drupal.org/node/2015723
+*/
+final class SubstanceIngredientsConstraint extends Constraint {
+    
+    public string $notUnique = 'Some chemicals were entered twice.';
+    
+}

src/Plugin/Validation/Constraint/SubstanceIngredientsConstraintValidator.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\farm_agrikern\Plugin\Validation\Constraint;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+* Validates the SubstanceIngredients constraint.
+* Ensures there are no duplicate Chemicals in the Ingredients of a Substance.
+*/
+final class SubstanceIngredientsConstraintValidator extends ConstraintValidator {
+    /**
+    * {@inheritdoc}
+    */
+    public function validate(mixed $items, Constraint $constraint): void {
+        if (!$items instanceof FieldItemListInterface) {
+            throw new \InvalidArgumentException(
+                sprintf('The validated value must be instance of \Drupal\Core\Field\FieldItemListInterface, %s was given.', get_debug_type($items))
+            );
+        }
+        $seen_quantities = [];
+        foreach ($items as $delta => $item) {
+            $ingredient = \Drupal::entityTypeManager()->getStorage('asset')->load($item->target_id);
+            $chemical_id = $ingredient->chemical_field->target_id;
+            if (isset($seen_quantities[$chemical_id])) {
+                $this->context->buildViolation($constraint->notUnique)
+                ->atPath($delta)
+                ->addViolation();
+            }
+            $seen_quantities[$chemical_id] = true;
+        }
+    }
+}