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#include <internal.h>
#include <debug.h>
#include <dnsquery.h>

#include <libgadu.h>
#include "resolver-purple.h"

static int ggp_resolver_purple_start(int *fd, void **private_data,
	const char *hostname);

static void ggp_resolver_purple_cleanup(void **private_data, int force);

static void ggp_resolver_purple_cb(GSList *hosts, gpointer cbdata,
	const char *error_message);

typedef struct
{
	PurpleDnsQueryData *purpleQuery;
	
	/**
	 * File descriptors:
	 *  pipes[0] - for reading
	 *  pipes[1] - for writing
	 */
	int pipes[2];
} ggp_resolver_purple_data;


extern void ggp_resolver_purple_setup(void)
{
	if (gg_global_set_custom_resolver(ggp_resolver_purple_start,
		ggp_resolver_purple_cleanup) != 0)
	{
		purple_debug_error("gg", "failed to set custom resolver\n");
	}
}

void ggp_resolver_purple_cb(GSList *hosts, gpointer cbdata,
	const char *error_message)
{
	ggp_resolver_purple_data *data = (ggp_resolver_purple_data*)cbdata;
	const int fd = data->pipes[1];
	int ipv4_count, all_count, write_size;
	struct in_addr *addresses;
	
	purple_debug_misc("gg", "ggp_resolver_purple_cb(%x, %x, \"%s\")\n",
		(unsigned int)hosts, (unsigned int)cbdata, error_message);
	
	if (error_message)
	{
		purple_debug_error("gg", "ggp_resolver_purple_cb failed: %s\n",
			error_message);
	}
	
	all_count = g_slist_length(hosts);
	g_assert(all_count % 2 == 0);
	all_count /= 2;
	addresses = malloc((all_count + 1) * sizeof(struct in_addr));
	
	ipv4_count = 0;
	while (hosts && (hosts = g_slist_delete_link(hosts, hosts)))
	{
		const struct sockaddr *addr = hosts->data;
		char dst[INET6_ADDRSTRLEN];
		
		if (addr->sa_family == AF_INET6)
		{
			inet_ntop(addr->sa_family,
				&((struct sockaddr_in6 *) addr)->sin6_addr,
				dst, sizeof(dst));
			purple_debug_misc("gg", "ggp_resolver_purple_cb "
				"ipv6 (ignore): %s\n", dst);
		}
		else if (addr->sa_family == AF_INET)
		{
			const struct in_addr addr_ipv4 =
				((struct sockaddr_in *) addr)->sin_addr;
			inet_ntop(addr->sa_family, &addr_ipv4,
				dst, sizeof(dst));
			purple_debug_misc("gg", "ggp_resolver_purple_cb "
				"ipv4: %s\n", dst);
			
			g_assert(ipv4_count < all_count);
			addresses[ipv4_count++] = addr_ipv4;
		}
		else
		{
			purple_debug_warning("gg", "ggp_resolver_purple_cb "
				"unexpected sa_family: %d\n", addr->sa_family);
		}
		
		g_free(hosts->data);
		hosts = g_slist_delete_link(hosts, hosts);
	}
	
	addresses[ipv4_count].s_addr = INADDR_NONE;
	
	write_size = (ipv4_count + 1) * sizeof(struct in_addr);
	if (write(fd, addresses, write_size) != write_size)
	{
		purple_debug_error("gg",
			"ggp_resolver_purple_cb write error\n");
	}
	free(addresses);
}

int ggp_resolver_purple_start(int *fd, void **private_data,
	const char *hostname)
{
	ggp_resolver_purple_data *data;
	purple_debug_misc("gg", "ggp_resolver_purple_start(%x, %x, \"%s\")\n",
		(unsigned int)fd, (unsigned int)private_data, hostname);
	
	data = malloc(sizeof(ggp_resolver_purple_data));
	*private_data = (void*)data;
	data->purpleQuery = NULL;
	data->pipes[0] = 0;
	data->pipes[1] = 0;
	
	if (purple_input_pipe(data->pipes) != 0)
	{
		purple_debug_error("gg", "ggp_resolver_purple_start: "
			"unable to create pipe\n");
		ggp_resolver_purple_cleanup(private_data, 0);
		return -1;
	}
	
	*fd = data->pipes[0];
	
	/* account and port is unknown in this context */
	data->purpleQuery = purple_dnsquery_a(NULL, hostname, 80,
		ggp_resolver_purple_cb, (gpointer)data);

	if (!data->purpleQuery)
	{
		purple_debug_error("gg", "ggp_resolver_purple_start: "
			"unable to call purple_dnsquery_a\n");
		ggp_resolver_purple_cleanup(private_data, 0);
		return -1;
	}
	
	return 0;
}

void ggp_resolver_purple_cleanup(void **private_data, int force)
{
	ggp_resolver_purple_data *data =
		(ggp_resolver_purple_data*)(*private_data);
	
	purple_debug_misc("gg", "ggp_resolver_purple_cleanup(%x, %d)\n",
		(unsigned int)private_data, force);
	
	if (!data)
		return;
	*private_data = NULL;
	
	if (data->pipes[0])
		close(data->pipes[0]);
	if (data->pipes[1])
		close(data->pipes[1]);
	
	free(data);
}