<?php
/**
 * Class Google\Site_Kit\Modules\Analytics_4\Settings
 *
 * @package   Google\Site_Kit\Modules\Analytics_4
 * @copyright 2021 Google LLC
 * @license   https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
 * @link      https://sitekit.withgoogle.com
 */

namespace Google\Site_Kit\Modules\Analytics_4;

use Google\Site_Kit\Core\Modules\Module_Settings;
use Google\Site_Kit\Core\Storage\Setting_With_Owned_Keys_Interface;
use Google\Site_Kit\Core\Storage\Setting_With_Owned_Keys_Trait;
use Google\Site_Kit\Core\Storage\Setting_With_ViewOnly_Keys_Interface;
use Google\Site_Kit\Core\Util\Feature_Flags;
use Google\Site_Kit\Modules\Analytics\Settings as Analytics_Settings;

/**
 * Class for Analytics 4 settings.
 *
 * @since 1.30.0
 * @access private
 * @ignore
 */
class Settings extends Module_Settings implements Setting_With_Owned_Keys_Interface, Setting_With_ViewOnly_Keys_Interface {

	use Setting_With_Owned_Keys_Trait;

	const OPTION = 'googlesitekit_analytics-4_settings';

	/**
	 * Registers the setting in WordPress.
	 *
	 * @since 1.30.0
	 */
	public function register() {
		parent::register();

		$this->register_owned_keys();
	}

	/**
	 * Gets Analytics 4 settings.
	 *
	 * @since 1.99.0
	 *
	 * @return array Analytics 4 settings, or default if not set.
	 */
	public function get() {
		$value = parent::get();

		// This is a temporary solution to keep using the Analytics ownerID setting
		// as the main source of truth for the Analytics 4 ownerID value.
		//
		// This is needed because currently the Analytics 4 functionality is separated
		// from the Analytics module and we need to keep the ownerID synced between two
		// modules. We will remove this hack when UA is sunset and only both modules
		// are merged.
		$analytics_settings = ( new Analytics_Settings( $this->options ) )->get();
		$value['ownerID']   = $analytics_settings['ownerID'];

		return $value;
	}

	/**
	 * Returns keys for owned settings.
	 *
	 * @since 1.30.0
	 *
	 * @return array An array of keys for owned settings.
	 */
	public function get_owned_keys() {
		return array(
			// TODO: These can be uncommented when Analytics and Analytics 4 modules are officially separated.
			/* 'accountID', */ // phpcs:ignore Squiz.PHP.CommentedOutCode.Found
			/* 'adsConversionID', */ // phpcs:ignore Squiz.PHP.CommentedOutCode.Found
			'propertyID',
			'webDataStreamID',
			'measurementID',
			'googleTagID',
			'googleTagAccountID',
			'googleTagContainerID',
		);
	}

	/**
	 * Returns keys for view-only settings.
	 *
	 * @since 1.113.0
	 *
	 * @return array An array of keys for view-only settings.
	 */
	public function get_view_only_keys() {
		if ( Feature_Flags::enabled( 'keyMetrics' ) ) {
			return array( 'availableCustomDimensions' );
		}

		return array();
	}

	/**
	 * Gets the default value.
	 *
	 * @since 1.30.0
	 *
	 * @return array
	 */
	protected function get_default() {
		return array(
			'ownerID'                   => 0,
			// TODO: These can be uncommented when Analytics and Analytics 4 modules are officially separated.
			/* 'accountID'              => '', */ // phpcs:ignore Squiz.PHP.CommentedOutCode.Found
			/* 'adsConversionID'        => '', */ // phpcs:ignore Squiz.PHP.CommentedOutCode.Found
			'propertyID'                => '',
			'webDataStreamID'           => '',
			'measurementID'             => '',
			'useSnippet'                => true,
			'googleTagID'               => '',
			'googleTagAccountID'        => '',
			'googleTagContainerID'      => '',
			'googleTagLastSyncedAtMs'   => 0,
			'availableCustomDimensions' => null,
		);
	}

	/**
	 * Gets the callback for sanitizing the setting's value before saving.
	 *
	 * @since 1.30.0
	 *
	 * @return callable|null
	 */
	protected function get_sanitize_callback() {
		return function( $option ) {
			if ( is_array( $option ) ) {
				if ( isset( $option['useSnippet'] ) ) {
					$option['useSnippet'] = (bool) $option['useSnippet'];
				}

				if ( isset( $option['googleTagID'] ) ) {
					if ( ! preg_match( '/^(G|GT|AW)-[a-zA-Z0-9]+$/', $option['googleTagID'] ) ) {
						$option['googleTagID'] = '';
					}
				}

				$numeric_properties = array( 'googleTagAccountID', 'googleTagContainerID' );
				foreach ( $numeric_properties as $numeric_property ) {
					if ( isset( $option[ $numeric_property ] ) ) {
						if ( ! is_numeric( $option[ $numeric_property ] ) || ! $option[ $numeric_property ] > 0 ) {
							$option[ $numeric_property ] = '';
						}
					}
				}

				if ( Feature_Flags::enabled( 'keyMetrics' ) && isset( $option['availableCustomDimensions'] ) ) {
					if ( is_array( $option['availableCustomDimensions'] ) ) {
						$valid_dimensions = array_filter(
							$option['availableCustomDimensions'],
							function( $dimension ) {
								return is_string( $dimension ) && strpos( $dimension, 'googlesitekit_' ) === 0;
							}
						);

						$option['availableCustomDimensions'] = array_values( $valid_dimensions );
					} else {
						$option['availableCustomDimensions'] = null;
					}
				}
			}

			return $option;
		};
	}

	/**
	 * Merges the current user ID into the module settings as the initial owner ID.
	 *
	 * @since 1.99.0
	 */
	protected function merge_initial_owner_id() {
		// This is a temporary solution to sync owner IDs between Analytics and Analytics 4 modules.
		// The owner ID setting of the Analytics module is the source of truth for the Analytics 4 module.
		// This will change when Analytics is sunset and we merge both modules into one.
		( new Analytics_Settings( $this->options ) )->merge( array( 'ownerID' => get_current_user_id() ) );
	}

	/**
	 * Adds the current user ID as the module owner ID to the current module settings.
	 *
	 * @since 1.99.0
	 *
	 * @param array $settings The new module settings.
	 * @return array Updated module settings with the current user ID as the ownerID setting.
	 */
	protected function update_owner_id_in_settings( $settings ) {
		// This is a temporary solution to sync owner IDs between Analytics and Analytics 4 modules.
		// The owner ID setting of the Analytics module is the source of truth for the Analytics 4 module.
		// This will change when Analytics is sunset and we merge both modules into one.
		( new Analytics_Settings( $this->options ) )->merge( array( 'ownerID' => get_current_user_id() ) );

		return $settings;
	}

}