<?php declare( strict_types = 1 );

/**
 * Atomic platform specific integrations for shared Edge Cache code.
 */
class Edge_Cache_Atomic implements Edge_Cache_Platform {

	/**
	 * Platform-specific code for purging a host and logging the result to logstash.
	 * {@inheritdoc}
	 */
	public function purge_domain( $domain, $tags ) {
		$body = $this->prepare_purge_body( $tags );

		$result = Edge_Cache_Plugin::get_instance()->query_ec_backend( 'purge', [ 'body' => $body ] );
		return is_array( $result ) && ! empty( $result['success'] );
	}

	/**
	 * Platform-specific code for purging a host and logging the result to logstash.
	 * {@inheritdoc}
	 */
	public function purge_uris( $uris, $tags ) {
		$body = $this->prepare_purge_body( $tags );
		$body['purge_uris'] = $uris;

		$result = Edge_Cache_Plugin::get_instance()->query_ec_backend( 'purge', [ 'body' => $body ] );
		return is_array( $result) && ! empty( $result['success'] );
	}

	/**
	 * Platform-specific code for getting the domain name.
	 * {@inheritdoc}
	 */
	public function get_domain_name() {
		static $domain_name = null;

		if ( empty( $domain_name ) ) {
			$site_url = get_site_url();
			if ( is_string( $site_url ) ) {
				$domain_name = parse_url( get_site_url(), PHP_URL_HOST );
			} else {
				$domain_name = '';
			}
		}

		return $domain_name;
	}

	/**
	 * Platform-specific code for determining if a domain is able to purge. All domains on Atomic can purge.
	 * {@inheritdoc}
	 */
	public function can_purge_domain( $domain ) {
		return true;
	}

	/**
	 * Return the current platform type.
	 * {@inheritdoc}
	 */
	public function get_platform_type() {
		return 'atomic';
	}

	/**
	 * Prepare a post body for a purge, converting raw logging tags
	 * into the format expected by the Atomic API.
	 */
	private function prepare_purge_body( $tags ) {
		$body = [
			'purge_count' => (int)( $tags['purge_count'] ?? 1 ),
			'wp_domain'   => $this->get_domain_name(),
			'at_host'     => php_uname( 'n' ),
			'wp_actions'  => $tags['wp_actions'],
			'wp_action'   => $tags['wp_action'],
			'batcache'    => $tags['batcache'],
		];

		foreach ( [ 'new_status', 'old_status', 'purge_count', 'uri_limit', 'target' ] as $tag ) {		
			if ( ! empty( $tags[ $tag ] ) ) {
				$body[ $tag ] = (string) $tags[ $tag ];
			}
		}

		return $body;
	}

}