Introduce new form validator for host/service terms

library/Businessprocess/Web/Form/Validator/HostServiceTermValidator.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form\Validator;
+
+use Icinga\Module\Businessprocess\BpConfig;
+use Icinga\Module\Businessprocess\BpNode;
+use Icinga\Module\Businessprocess\ServiceNode;
+use Icinga\Module\Businessprocess\State\IcingaDbState;
+use Icinga\Module\Businessprocess\State\MonitoringState;
+use Icinga\Module\Monitoring\Backend\MonitoringBackend;
+use ipl\I18n\Translation;
+use ipl\Validator\BaseValidator;
+use ipl\Web\FormElement\TermInput\Term;
+use LogicException;
+
+class HostServiceTermValidator extends BaseValidator
+{
+    use Translation;
+
+    /** @var ?BpNode */
+    protected $parent;
+
+    /**
+     * Set the affected process
+     *
+     * @param BpNode $parent
+     *
+     * @return $this
+     */
+    public function setParent(BpNode $parent): self
+    {
+        $this->parent = $parent;
+
+        return $this;
+    }
+
+    public function isValid($terms)
+    {
+        if ($this->parent === null) {
+            throw new LogicException('Missing parent process. Cannot validate terms.');
+        }
+
+        if (! is_array($terms)) {
+            $terms = [$terms];
+        }
+
+        $testConfig = new BpConfig();
+
+        foreach ($terms as $term) {
+            /** @var Term $term */
+            [$hostName, $serviceName] = BpConfig::splitNodeName($term->getSearchValue());
+            if ($serviceName !== null && $serviceName !== 'Hoststatus') {
+                $node = $testConfig->createService($hostName, $serviceName);
+            } else {
+                $node = $testConfig->createHost($hostName);
+                if ($serviceName === null) {
+                    $term->setSearchValue(BpConfig::joinNodeName($hostName, 'Hoststatus'));
+                }
+            }
+
+            if ($this->parent->hasChild($term->getSearchValue())) {
+                $term->setMessage($this->translate('Already defined in this process'));
+            } else {
+                $testConfig->getNode('__unbound__')
+                    ->addChild($node);
+            }
+        }
+
+        if ($this->parent->getBpConfig()->getBackend() instanceof MonitoringBackend) {
+            MonitoringState::apply($testConfig);
+        } else {
+            IcingaDbState::apply($testConfig);
+        }
+
+        foreach ($terms as $term) {
+            /** @var Term $term */
+            $node = $testConfig->getNode($term->getSearchValue());
+            if ($node->isMissing()) {
+                if ($node instanceof ServiceNode) {
+                    $term->setMessage($this->translate('Service not found'));
+                } else {
+                    $term->setMessage($this->translate('Host not found'));
+                }
+            } else {
+                $term->setLabel($node->getAlias());
+                $term->setClass($node->getObjectClassName());
+            }
+        }
+    }
+}