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<?php

namespace WPForms\Integrations;

/**
 * Class Loader gives ability to track/load all integrations.
 *
 * @since 1.4.8
 */
class Loader {

	/**
	 * Get the instance of a class and store it in itself.
	 *
	 * @since 1.4.8
	 */
	public static function get_instance() {

		static $instance;

		if ( ! $instance ) {
			$instance = new Loader();
		}

		return $instance;
	}

	/**
	 * Loader constructor.
	 *
	 * @since 1.4.8
	 */
	public function __construct() {

		$core_class_names = [
			'SMTP\Notifications',
			'LiteConnect\LiteConnect',
			'Divi\Divi',
			'Elementor\Elementor',
			'WPCode\WPCode',
			'WPCode\RegisterLibrary',
			'Gutenberg\FormSelector',
			'WPMailSMTP\Notifications',
			'WPorg\Translations',
			'Stripe\Stripe',
			'UncannyAutomator\UncannyAutomator',
			'UsageTracking\UsageTracking',
			'DefaultThemes\DefaultThemes',
			'Translations\Translations',
			'DefaultContent\DefaultContent',
			'PopupMaker\PopupMaker',
			'WooCommerce\Notifications',
			'AI\AI',
			'ConstantContact\V3\ConstantContact',
			'Square\Square',
		];

		/**
		 * Filter available integrations.
		 *
		 * @since 1.7.0
		 *
		 * @param array $core_class_names Array of core class names.
		 */
		$class_names = (array) apply_filters( 'wpforms_integrations_available', $core_class_names ); // phpcs:ignore WPForms.PHP.ValidateHooks.InvalidHookName

		foreach ( $class_names as $class_name ) {
			$integration = $this->register_class( $class_name );

			wpforms()->register_instance( $class_name, $integration );

			if ( ! empty( $integration ) ) {
				$this->load_integration( $integration );
			}
		}
	}

	/**
	 * Load an integration.
	 *
	 * @param IntegrationInterface $integration Instance of an integration class.
	 *
	 * @since 1.4.8
	 */
	protected function load_integration( IntegrationInterface $integration ) {

		if ( $integration->allow_load() ) {
			$integration->load();
		}
	}

	/**
	 * Register a new class.
	 *
	 * @since 1.5.6
	 *
	 * @param string $class_name Class name to register.
	 *
	 * @return IntegrationInterface Instance of class.
	 */
	public function register_class( $class_name ) {

		$class_name = sanitize_text_field( $class_name );

		// Load Lite class if exists.
		if ( class_exists( 'WPForms\Lite\Integrations\\' . $class_name ) && ! wpforms()->is_pro() ) {
			$class_name = 'WPForms\Lite\Integrations\\' . $class_name;

			return new $class_name();
		}

		// Load Pro class if exists.
		if ( class_exists( 'WPForms\Pro\Integrations\\' . $class_name ) && wpforms()->is_pro() ) {
			$class_name = 'WPForms\Pro\Integrations\\' . $class_name;

			return new $class_name();
		}

		// Load general class if neither Pro nor Lite class exists.
		if ( class_exists( __NAMESPACE__ . '\\' . $class_name ) ) {
			$class_name = __NAMESPACE__ . '\\' . $class_name;

			return new $class_name();
		}
	}
}