From eae8fafb326f8fd2f24ca5a9cbba8811b03a643a Mon Sep 17 00:00:00 2001
From: Vladimir Bryzgalov <vladimir.bryzgalov@gmail.com>
Date: Tue, 21 Apr 2026 15:56:14 +0500
Subject: [PATCH] feat(classifier): has_valid_email_anywhere() helper for
 drop-logic

---
 includes/class-classifier.php | 15 +++++++++++++++
 tests/ClassifierDropTest.php  | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 tests/ClassifierDropTest.php

diff --git a/includes/class-classifier.php b/includes/class-classifier.php
index a6f7986..bcbccc1 100644
--- a/includes/class-classifier.php
+++ b/includes/class-classifier.php
@@ -215,4 +215,19 @@ final class Classifier
         }
         return $hits;
     }
+
+    public static function has_valid_email_anywhere(array $fields): bool
+    {
+        foreach ($fields as $v) {
+            $values = is_array($v) ? $v : [$v];
+            foreach ($values as $val) {
+                $val = trim((string)$val);
+                if ($val === '') continue;
+                if (preg_match('/[A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}/', $val, $m)) {
+                    if (is_email($m[0])) return true;
+                }
+            }
+        }
+        return false;
+    }
 }
diff --git a/tests/ClassifierDropTest.php b/tests/ClassifierDropTest.php
new file mode 100644
index 0000000..7c283cf
--- /dev/null
+++ b/tests/ClassifierDropTest.php
@@ -0,0 +1,32 @@
+<?php
+declare(strict_types=1);
+
+namespace Cf7stg\Tests;
+
+use Cf7stg\Classifier;
+
+final class ClassifierDropTest extends Cf7stgTestCase
+{
+    public function test_has_valid_email_anywhere_finds_gmail(): void
+    {
+        $fields = ['some-key' => 'pasha@gmail.com'];
+        self::assertTrue(Classifier::has_valid_email_anywhere($fields));
+    }
+
+    public function test_has_valid_email_anywhere_finds_in_array_value(): void
+    {
+        $fields = ['x' => ['noise', 'info@some-domain.com']];
+        self::assertTrue(Classifier::has_valid_email_anywhere($fields));
+    }
+
+    public function test_has_valid_email_anywhere_returns_false_for_invalid(): void
+    {
+        $fields = ['email' => 'not-an-email', 'x' => 'AB'];
+        self::assertFalse(Classifier::has_valid_email_anywhere($fields));
+    }
+
+    public function test_has_valid_email_anywhere_returns_false_when_empty(): void
+    {
+        self::assertFalse(Classifier::has_valid_email_anywhere([]));
+    }
+}