#ifndef DNS_H
#define DNS_H

#include "../Platforms.h"
#include "../Debug.h"

typedef void (*DNSResolveCallback)(const char* name, const ip_addr_t* ip, void* arg);

#if ESP8266
	class DNS {

		static constexpr const char* NAME = "DNS";

		espconn dns;
		ip_addr_t ip;

		DNSResolveCallback callback;
		void* arg;

	public:

		/** resolve hostname. creates callback */
		void resolveHost(const char* c, DNSResolveCallback callback, void* arg) {
			debugMod1(NAME, "dns lookup: %s", c);
			this->callback = callback;
			this->arg = arg;
			dns.reverse = (void*) this;
			espconn_gethostbyname(&dns, c, &ip, _onHostResolved);
		}

		static void _onHostResolved(const char* name, const ip_addr_t* ipaddr, void* arg) {
			debugMod1(NAME, "dns resolved: %s", c);
			DNS* dns = (DNS*) arg;
			dns->callback(name, ipaddr, dns->arg);
		}

	};
#elif ESP32

	#include <lwip/dns.h>

	class DNS {

		static constexpr const char* NAME = "DNS";
		ip_addr_t ip;
		DNSResolveCallback callback;
		void* arg;

	public:

		/** resolve hostname. creates callback */
		void resolveHost(const char* host, DNSResolveCallback callback, void* arg) {
			debugMod1(NAME, "dns lookup: %s", host);
			this->callback = callback;
			this->arg = arg;
			dns_gethostbyname(host, &ip, _onHostResolved, this);
		}

		static void _onHostResolved(const char* name, const ip_addr_t* ipaddr, void* arg) {
			debugMod1(NAME, "dns resolved: %s", name);
			DNS* dns = (DNS*) arg;
			dns->callback(name, ipaddr, dns->arg);
		}

	};

#endif

#endif // DNS_H