Introduce SettingsController for managing editor settings

[MAILPOET-5637]

mailpoet/lib/EmailEditor/Engine/SettingsController.php

@@ -0,0 +1,49 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\EmailEditor\Engine;
+
+class SettingsController {
+
+  const ALLOWED_BLOCK_TYPES = [
+    'core/paragraph',
+    'core/heading',
+    'core/column',
+    'core/columns',
+    'core/image',
+  ];
+
+  const DEFAULT_SETTINGS = [
+    'enableCustomSpacing' => true,
+    'enableCustomLineHeight' => true,
+    'disableCustomFontSizes' => false,
+    'enableCustomUnits' => ['px', '%'],
+    '__experimentalFeatures' => [
+      'color' => [
+        'custom' => true,
+        'text' => true,
+        'background' => true,
+        'customGradient' => false,
+        'defaultPalette' => true,
+        'palette' => [
+          'default' => [],
+        ],
+      ],
+    ],
+  ];
+
+  /** @var StylesController */
+  private $stylesController;
+
+  public function __construct(
+    StylesController $stylesController
+  ) {
+    $this->stylesController = $stylesController;
+  }
+
+  public function getSettings(): array {
+    $settings = self::DEFAULT_SETTINGS;
+    $settings['allowedBlockTypes'] = self::ALLOWED_BLOCK_TYPES;
+    $settings['defaultEditorStyles'] = [[ 'css' => $this->stylesController->getEmailContentStyles() ]];
+    return $settings;
+  }
+}