<?php
/**
 * This subscription service is used when a subscriber is online
 *
 * @package Automattic\Jetpack\Extensions\Premium_Content
 */

namespace Automattic\Jetpack\Extensions\Premium_Content\Subscription_Service;

/**
 * Class WPCOM_Offline_Subscription_Service
 *
 * @package Automattic\Jetpack\Extensions\Premium_Content\Subscription_Service
 */
class WPCOM_Online_Subscription_Service extends Jetpack_Token_Subscription_Service {

	/**
	 * Is available()
	 *
	 * @return bool
	 */
	public static function available() {
		// Return available if the user is logged in and we are on WPCOM.
		return defined( 'IS_WPCOM' ) && IS_WPCOM && is_user_logged_in();
	}

	/**
	 * Lookup users subscriptions for a site and determine if the user has a valid subscription to match the plan ID
	 *
	 * @param array  $valid_plan_ids .
	 * @param string $access_level .
	 *
	 * @return bool
	 */
	public function visitor_can_view_content( $valid_plan_ids, $access_level ) {
		include_once WP_CONTENT_DIR . '/mu-plugins/email-subscriptions/subscriptions.php';
		$email             = wp_get_current_user()->user_email;
		$subscriber_object = \Blog_Subscriber::get( $email );

		$is_blog_subscriber = false;
		if ( $subscriber_object ) {
			$blog_id             = $this->get_site_id();
			$subscription_status = \Blog_Subscription::get_subscription_status_for_blog( $subscriber_object, $blog_id );
			$is_blog_subscriber  = 'active' === $subscription_status;
		}

		return $this->user_can_view_content( $valid_plan_ids, $access_level, $is_blog_subscriber, get_the_ID() );
	}

	/**
	 * Retrieves the email of the currently authenticated subscriber.
	 *
	 * This function checks if the current user has an active subscription. If the user is subscribed,
	 * their email is returned. Otherwise, it returns an empty string to indicate no active subscription.
	 *
	 * @return string The email address of the subscribed user or an empty string if not subscribed.
	 */
	public function get_subscriber_email() {
		if ( ! is_user_logged_in() ) {
			return '';
		}
		return wp_get_current_user()->user_email;
	}

	/**
	 * Returns true if the current authenticated user is subscribed to the current site.
	 *
	 * @return bool
	 */
	public function is_current_user_subscribed(): bool {
		include_once WP_CONTENT_DIR . '/mu-plugins/email-subscriptions/subscriptions.php';
		$email             = wp_get_current_user()->user_email;
		$subscriber_object = \Blog_Subscriber::get( $email );
		if ( empty( $subscriber_object ) ) {
			return false;
		}
		$blog_id             = $this->get_site_id();
		$subscription_status = \Blog_Subscription::get_subscription_status_for_blog( $subscriber_object, $blog_id );
		if ( 'active' !== $subscription_status ) {
			return false;
		}
		return true;
	}

	/**
	 * Returns true if the current authenticated user has a pending subscription to the current site.
	 *
	 * @return bool
	 */
	public function is_current_user_pending_subscriber(): bool {
		include_once WP_CONTENT_DIR . '/mu-plugins/email-subscriptions/subscriptions.php';
		$email             = wp_get_current_user()->user_email;
		$subscriber_object = \Blog_Subscriber::get( $email );
		if ( empty( $subscriber_object ) ) {
			return false;
		}
		$blog_id             = $this->get_site_id();
		$subscription_status = \Blog_Subscription::get_subscription_status_for_blog( $subscriber_object, $blog_id );
		if ( self::BLOG_SUB_PENDING !== $subscription_status ) {
			return false;
		}
		return true;
	}

	/**
	 * Lookup users subscriptions for a site and determine if the user has a valid subscription to match the plan ID
	 *
	 * @param array  $valid_plan_ids .
	 * @param string $access_level .
	 * @param bool   $is_blog_subscriber .
	 * @param int    $post_id .
	 *
	 * @return bool
	 */
	protected function user_can_view_content( $valid_plan_ids, $access_level, $is_blog_subscriber, $post_id ) {
		$user_id = is_user_logged_in() ? wp_get_current_user()->ID : $this->user_id;
		/**
		 * Filter the subscriptions attached to a specific user on a given site.
		 *
		 * @since 9.4.0
		 *
		 * @param array $subscriptions Array of subscriptions.
		 * @param int   $user_id The user's ID.
		 * @param int   $site_id ID of the current site.
		 */
		$subscriptions = apply_filters( 'earn_get_user_subscriptions_for_site_id', array(), $user_id, $this->get_site_id() );
		// format the subscriptions so that they can be validated.
		$subscriptions      = self::abbreviate_subscriptions( $subscriptions );
		$is_paid_subscriber = static::validate_subscriptions( $valid_plan_ids, $subscriptions );

		return $this->user_has_access( $access_level, $is_blog_subscriber, $is_paid_subscriber, $post_id, $subscriptions );
	}

	/**
	 * Report the subscriptions as an ID => [ 'end_date' => ]. mapping
	 *
	 * @param array $subscriptions_from_bd .
	 *
	 * @return array<int, object>
	 */
	public static function abbreviate_subscriptions( $subscriptions_from_bd ) {
		$subscriptions = array();
		foreach ( $subscriptions_from_bd as $subscription ) {
			// We are picking the expiry date that is the most in the future.
			if (
				'active' === $subscription['status'] && (
					! isset( $subscriptions[ $subscription['product_id'] ] ) ||
					empty( $subscription['end_date'] ) || // Special condition when subscription has no expiry date - we will default to a year from now for the purposes of the token.
					strtotime( $subscription['end_date'] ) > strtotime( (string) $subscriptions[ $subscription['product_id'] ]->end_date )
				)
			) {
				$subscriptions[ $subscription['product_id'] ]           = new \stdClass();
				$subscriptions[ $subscription['product_id'] ]->end_date = empty( $subscription['end_date'] ) ? ( time() + 365 * 24 * 3600 ) : $subscription['end_date'];
			}
		}
		return $subscriptions;
	}

	/**
	 * Get the site ID.
	 *
	 * @return int The site ID.
	 */
	public function get_site_id() {
		return get_current_blog_id();
	}
}
