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/*
 *
 * Copyright (C) 2018 Fonpit AG
 *
 */

package org.id4me;

import java.net.IDN;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author Sven Woltmann
 */
class Id4meDnsResponseParser {

	private static final Logger log = LoggerFactory.getLogger(Id4meDnsResponseParser.class);

	private Id4meDnsResponseParser() {
		// hide implicit public constructor of utility class
	}

	static Id4meDnsData parseDnsResponse(String data) throws Exception {
		String v = null;
		String iau = null;
		String iag = null;

		String[] values = data.split(";");
		for (String value : values) {
			String[] e = value.trim().split("=");
			if (e.length == 2) {
				log.debug("DNS response: {} = \"{}\"", e[0], e[1]);
				if ("v".equals(e[0])) {
					if (v != null) {
						log.warn("More than one v field found in TXT RR: {}", data);
						throw new Exception("More than one v field found in TXT RR: " + data);
					} else {
						v = e[1].trim();
					}
				}
				if ("iss".equals(e[0])) {
					if (iau != null) {
						log.warn("More than one iss field found in TXT RR: {}", data);
						throw new Exception("More than one iss field found in TXT RR: " + data);
					} else {
						iau = e[1].trim();
						iau = IDN.toASCII(iau);
					}
				}
/* CLP discovery removed  				
				if ("clp".equals(e[0])) {
					if (iag != null) {
						log.warn("More than one clp field found in TXT RR: {}", data);
						throw new Exception("More than one clp field found in TXT RR: " + data);
					} else {
						iag = e[1].trim();
						iag = IDN.toASCII(iag);
					}
				}
*/
				if ("iau".equals(e[0])) {
					if (iau != null) {
						log.warn("More than one iss field found in TXT RR: {}", data);
						throw new Exception("More than one iss field found in TXT RR: " + data);
					} else {
						iau = e[1].trim();
						iau = IDN.toASCII(iau);
					}
				}
				if ("iag".equals(e[0])) {
					if (iag != null) {
						log.warn("More than one clp field found in TXT RR: {}", data);
						throw new Exception("More than one clp field found in TXT RR: " + data);
					} else {
						iag = e[1].trim();
						iag = IDN.toASCII(iag);
					}
				}

			}
		}

		validateParameters(v, iau, iag);

		return buildDataObject(v, iau, iag);
	}

	private static void validateParameters(String v, String iau, String iag) throws Exception {
		if (!"OID1".equals(v)) {
			log.warn("Error getting domain-id data from DNS: version != \"OID1\"");
			throw new Exception("Error getting domain-id data from DNS: version != \"OID1\"");
		} else if (iau == null) {
			log.warn("Error getting domain-id data from DNS: iss missing");
			throw new Exception("Error getting domain-id data from DNS: iss missing");
		}

		/*
		 * else if (iag == null) {
		 * log.warn("Error getting domain-id data from DNS: clp missing"); throw new
		 * Exception("Error getting domain-id data from DNS: clp missing"); }
		 */
	}

	private static Id4meDnsData buildDataObject(String v, String iau, String iag) {
		iau = removeTrailingSlash(iau);
		iag = removeTrailingSlash(iag);

		return new Id4meDnsData(v, iau, iag);
	}

	private static String removeTrailingSlash(String s) {
		if (s == null) {
			return s;
		}
		return s.endsWith("/") ? s.substring(0, s.length() - 1) : s;
	}

}