<?php

namespace WPMailSMTP\Pro\Emails\Logs\Webhooks\Providers\Sendinblue;

use WPMailSMTP\Pro\Emails\Logs\Webhooks\AbstractSubscriber;
use WPMailSMTP\Helpers\Helpers;
use WPMailSMTP\WP;
use WP_Error;

/**
 * Class Subscriber.
 *
 * @since 3.3.0
 */
class Subscriber extends AbstractSubscriber {

	/**
	 * Subscription events.
	 *
	 * @since 3.3.0
	 *
	 * @var array
	 */
	const EVENTS = [
		'delivered',
		'hardBounce',
		'softBounce',
		'blocked',
		'invalid',
	];

	/**
	 * Create webhook subscription.
	 *
	 * @since 3.3.0
	 *
	 * @return true|WP_Error
	 */
	public function subscribe() {

		$subscription = $this->get_subscription();

		if ( is_wp_error( $subscription ) ) {
			return $subscription;
		}

		// Already subscribed.
		if ( $subscription !== false && empty( array_diff( self::EVENTS, $subscription['events'] ) ) ) {
			return true;
		}

		$events = $subscription !== false ? $subscription['events'] : [];
		$events = array_values( array_unique( array_merge( $events, self::EVENTS ) ) );

		$body = [
			'url'         => $this->provider->get_url(),
			'events'      => $events,
			'description' => esc_html__( 'WP Mail SMTP', 'wp-mail-smtp-pro' ),
			'type'        => 'transactional',
		];

		if ( $subscription !== false && ! empty( $subscription['id'] ) ) {
			// Update subscription.
			$response = $this->request( 'PUT', $body, $subscription['id'] );
		} else {
			// Create subscription.
			$response = $this->request( 'POST', $body );
		}

		if ( is_wp_error( $response ) ) {
			return $response;
		}

		return true;
	}

	/**
	 * Remove webhook subscription.
	 *
	 * @since 3.3.0
	 *
	 * @return true|WP_Error
	 */
	public function unsubscribe() {

		$subscription = $this->get_subscription();

		if ( is_wp_error( $subscription ) ) {
			return $subscription;
		}

		// Already unsubscribed.
		if ( $subscription === false ) {
			return true;
		}

		// Delete subscription.
		$response = $this->request( 'DELETE', [], $subscription['id'] );

		if ( is_wp_error( $response ) ) {
			return $response;
		}

		return true;
	}

	/**
	 * Check webhook subscription.
	 *
	 * @since 3.3.0
	 *
	 * @return bool|WP_Error
	 */
	public function is_subscribed() {

		$subscription = $this->get_subscription();

		if ( is_wp_error( $subscription ) ) {
			return $subscription;
		}

		// Subscription does not exist.
		if ( $subscription === false ) {
			return false;
		}

		return empty( array_diff( self::EVENTS, $subscription['events'] ) );
	}

	/**
	 * Get subscription if available.
	 *
	 * @since 3.3.0
	 *
	 * @return array|false|WP_Error
	 */
	protected function get_subscription() {

		$params = [
			'type' => 'transactional',
		];

		$response = $this->request( 'GET', $params );

		// Not found any subscriptions.
		if ( is_wp_error( $response ) && $response->get_error_code() === 'document_not_found' ) {
			return false;
		}

		if ( is_wp_error( $response ) ) {
			return $response;
		}

		$webhooks = array_filter(
			$response['webhooks'],
			function ( $data ) {
				return $data['url'] === $this->provider->get_url();
			}
		);

		return ! empty( $webhooks ) ? array_values( $webhooks )[0] : false;
	}

	/**
	 * Performs Sendinblue webhooks API HTTP request.
	 *
	 * @since 3.3.0
	 *
	 * @param string $method     Request method.
	 * @param array  $params     Request params.
	 * @param string $webhook_id Sendinblue webhook ID.
	 *
	 * @return mixed|WP_Error
	 */
	protected function request( $method = 'GET', $params = [], $webhook_id = false ) {

		$endpoint = 'https://api.brevo.com/v3/webhooks';

		$args = [
			'method'  => $method,
			'headers' => [
				'api-key'      => $this->provider->get_option( 'api_key' ),
				'content-type' => 'application/json',
			],
		];

		if ( $method === 'GET' ) {
			$endpoint = add_query_arg( $params, $endpoint );
		} else {
			$args['body'] = wp_json_encode( $params );
		}

		if ( $webhook_id !== false ) {
			$endpoint .= '/' . $webhook_id;
		}

		$response = wp_remote_request( $endpoint, $args );

		if ( is_wp_error( $response ) ) {
			return $response;
		}

		if ( ! in_array( wp_remote_retrieve_response_code( $response ), [ 200, 201, 202, 204 ], true ) ) {
			return $this->get_response_error( $response );
		}

		return json_decode( wp_remote_retrieve_body( $response ), true );
	}

	/**
	 * Retrieve errors from Sendinblue API response.
	 *
	 * @since 3.3.0
	 *
	 * @param array $response Response array.
	 *
	 * @return WP_Error
	 */
	protected function get_response_error( $response ) {

		$body       = json_decode( wp_remote_retrieve_body( $response ) );
		$error_code = wp_remote_retrieve_response_code( $response );

		if ( ! empty( $body->message ) ) {
			$message    = $body->message;
			$error_code = ! empty( $body->code ) ? $body->code : '';

			$error_text = Helpers::format_error_message( $message, $error_code );
		} else {
			$error_text = WP::wp_remote_get_response_error_message( $response );
		}

		return new WP_Error( $error_code, $error_text );
	}
}