<?php
/**
 * Misc. Functions
 */

/**
 * Get the Server URL
 *
 * @return String
 */
function sendwp_get_server_url() {
	$server_url = ( defined( 'SENDWP_SERVER_URL' ) ) ? SENDWP_SERVER_URL : 'https://app.sendwp.com';

	return trailingslashit( $server_url );
}

/**
 * Get the request authentication header
 *
 * @return String
 */
function sendwp_get_request_auth_header() {
	return 'Basic ' . base64_encode( sendwp_get_client_name() . ':' . sendwp_get_client_secret() );
}

/**
 * Get client name
 *
 * @return String
 */
function sendwp_get_client_name() {
	$site_url = get_site_url();

	return parse_url( $site_url, PHP_URL_HOST );
}

/**
 * Get the client_url
 *
 * @return String
 */
function sendwp_get_client_url() {
	return get_site_url();
}

/**
 * Get client redirect url
 *
 * @return String
 */
function sendwp_get_client_redirect() {
	return add_query_arg( 'page', 'sendwp', get_admin_url( null, 'tools.php' ) );
}

/**
 * Get client secret
 *
 * @return String
 */
function sendwp_get_client_secret() {
	$secret = get_option( 'sendwp_client_secret' );

	if ( ! $secret ) {
		$secret = sendwp_generate_secret();

		sendwp_set_client_secret( $secret );
	}

	return $secret;
}

/**
 * Set the client secret
 *
 * @param String $secret
 *
 * @return Boolean
 */
function sendwp_set_client_secret( $secret ) {
	return update_option( 'sendwp_client_secret', $secret );
}

/**
 * Generate the secret
 *
 * @param Integer $length
 *
 * @return String
 */
function sendwp_generate_secret( $length = 40 ) {
	if ( 0 >= $length ) {
		$length = 40; // Min key length.
	}

	if ( 255 <= $length ) {
		$length = 255; // Max key length.
	}

	$characters    = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
	$random_string = '';

	for ( $i = 0; $i < $length; $i ++ ) {
		$random_string .= $characters[ rand( 0, strlen( $characters ) - 1 ) ];
	}

	return $random_string;
}

/**
 * Connect the client
 *
 * @return Void
 */
function sendwp_connect_client() {
	update_option( 'sendwp_client_connected', '1' );
}

/**
 * Disconnect the client
 *
 * @return Void
 */
function sendwp_disconnect_client() {
	update_option( 'sendwp_client_connected', '0' );
}

/**
 * Check if client is connected
 *
 * @return Bool
 */
function sendwp_client_connected() {
	$connected = get_option( 'sendwp_client_connected', '0' );

	if ( '1' === $connected || 1 === $connected ) {
		$connected = true;
	} else {
		$connected = false;
	}
	return $connected;
}

/**
 * Update the client connection
 *
 * @return Bool|Void
 */
function sendwp_update_client_connection() {
	if ( ! isset( $_POST['sendwp_server_request'] ) ) {
		return false;
	}

	if ( ! isset( $_POST['sendwp_hash'] ) || ! sendwp_validate_hash( $_POST['sendwp_hash'] ) ) {
		return false;
	}

	if ( 'disconnect' === $_POST['sendwp_server_request'] ) {
		sendwp_disconnect_client();
	} elseif ( 'connect' === $_POST['sendwp_server_request'] ) {
		sendwp_connect_client();
	}
}

/**
 * Get client status
 *
 * @return Bool|String
 */
function sendwp_get_client_status() {
	if ( ! isset( $_POST['sendwp_request_status'] ) ) {
		return false;
	}

	if ( ! isset( $_POST['sendwp_hash'] ) || ! sendwp_validate_hash( $_POST['sendwp_hash'] ) ) {
		return false;
	}

	$response = array(
		'connected' => sendwp_client_connected(),
		'enabled'   => sendwp_forwarding_enabled(),
	);

	header( 'Content-Type: application/json' );

	echo json_encode( $response );

	die();
}

/**
 * Validate the hash
 *
 * @return Bool
 */
function sendwp_validate_hash( $hash ) {
	return sendwp_generate_hash() === $hash;
}

/**
 * Get the hash
 *
 * @return String
 */
function sendwp_get_hash() {
	return sendwp_generate_hash();
}

/**
 * Generate the hash
 *
 * @return String
 */
function sendwp_generate_hash() {
	$data = sendwp_get_client_name() . sendwp_get_client_secret();

	return hash( 'sha256', $data );
}

/**
 * Enable mail forwarding
 *
 * @return Void
 */
function sendwp_enable_forwarding() {
	update_option( 'sendwp_forwarding_enabled', '1' );
}

/**
 * Disable mail forwarding
 *
 * @return Void
 */
function sendwp_disable_forwarding() {
	update_option( 'sendwp_forwarding_enabled', '0' );
}

/**
 * Enqueues fowarding disabled notice
 *
 * @return Void
 */
function sendwp_forwarding_disabled_notice() {
	if ( isset( $_GET['page'] ) && 'sendwp' === $_GET['page'] ) {
		return;
	}

	if ( ! sendwp_forwarding_enabled() ) {
		wp_enqueue_style( 'sendwp-notices', plugins_url( 'assets/css/admin/notices.css', __DIR__ ) );
		include 'admin/views/disabled-notice.html.php';
	}
}

/**
 * Check if forwarding is enabled
 *
 * @return Bool
 */
function sendwp_forwarding_enabled() {
	$enabled = get_option( 'sendwp_forwarding_enabled', '1' );

	if ( ( '1' === $enabled || 1 === $enabled ) && sendwp_client_connected() ) {
		$enabled = true;
	} else {
		$enabled = false;
	}

	return $enabled;
}

/**
 * Possibly disable mail forwarding
 *
 * @return Bool|Void
 */
function sendwp_maybe_disable_forwarding() {
	if ( ! isset( $_POST['security'] ) ) {
		return false;
	}

	if ( ! wp_verify_nonce( $_POST['security'], 'sendwp_settings_nonce' ) ) {
		return false;
	}

	if ( isset( $_POST['sendwp_forwarding'] ) ) {
		if ( 'enable' === $_POST['sendwp_forwarding'] ) {
			sendwp_enable_forwarding();
		} elseif ( 'disable' === $_POST['sendwp_forwarding'] ) {
			sendwp_disable_forwarding();
		}
	}
}

/**
 * Connect pulse monitor
 *
 * @return Void
 */
function sendwp_connect_pulse_monitor() {
	if ( ! wp_next_scheduled( 'sendwp_heartbeat' ) ) {
		wp_schedule_event( time(), 'daily', 'sendwp_heartbeat' );
	}
}

/**
 * Check the pulse monitor
 *
 * @return Bool|Void
 */
function sendwp_pulse_monitor() {
	if ( get_transient( 'sendwp_pulse_monitor' ) ) {
		return false;
	}

	$status   = 'unknown';
	$request  = \SendWP\API\Request::create( 'clients/status' );
	$response = $request->post( array() );

	if ( is_wp_error( $response ) ) {
		set_transient( 'sendwp_pulse_monitor', $response->get_error_message(), 10 * MINUTE_IN_SECONDS );

		return;
	}

	$response_body = wp_remote_retrieve_body( $response );

	set_transient( 'sendwp_pulse_monitor', $response_body, 10 * MINUTE_IN_SECONDS );

	$status = json_decode( $response_body );

	if ( 'not-connected' === $status->message ) {
		sendwp_disconnect_client();
	} elseif ( 'connected' === $status->message ) {
		sendwp_connect_client();
	}
}

/**
 * Get last pulse result
 *
 * @return String
 */
function sendwp_last_pulse() {
	$timestamp = time();
	$saved     = get_option( '_transient_timeout_sendwp_pulse_monitor', $timestamp );

	if ( $saved > $timestamp ) {
		$timestamp = $saved - 600;
	}

	$iso_date        = gmdate( 'Y-m-d H:i:s', $timestamp );
	$local_timestamp = get_date_from_gmt( $iso_date, 'F j, Y, g:i a' );

	return $local_timestamp;
}

/**
 * Return last pulse result
 *
 * @return String
 */
function sendwp_last_pulse_result() {
	return get_option( '_transient_sendwp_pulse_monitor', 'unknown' );
}

/**
 * Reset all plugin data
 *
 * @return Void
 */
function sendwp_reset_all_plugin_data() {
	if ( check_admin_referer( 'reset_sendwp_data' . sendwp_get_client_secret() ) ) {
		$options = array(
			'sendwp_client_secret',
		);

		foreach ( $options as $option ) {
			if ( get_option( $option, false ) !== false ) {
				delete_option( $option );
			}
		}

		sendwp_set_client_secret( sendwp_generate_secret() );
	}

	wp_redirect( sendwp_get_client_redirect() );

	exit;
}
add_action( 'admin_post_sendwp_reset_plugin_data', 'sendwp_reset_all_plugin_data' );