<?php
/**
 * @file include/hubloc.php
 * @brief Hubloc related functions.
 */

/**
 * @brief Create an array for hubloc table and insert record.
 *
 * Creates an assoziative array which will be inserted into the hubloc table.
 *
  * @param array $arr An assoziative array with hubloc values
 * @return boolean|PDOStatement
 */
function hubloc_store_lowlevel($arr) {

	$store = [
		'hubloc_guid'        => ((array_key_exists('hubloc_guid',$arr))        ? $arr['hubloc_guid']        : ''),
		'hubloc_guid_sig'    => ((array_key_exists('hubloc_guid_sig',$arr))    ? $arr['hubloc_guid_sig']    : ''),
		'hubloc_hash'        => ((array_key_exists('hubloc_hash',$arr))        ? $arr['hubloc_hash']        : ''),
		'hubloc_addr'        => ((array_key_exists('hubloc_addr',$arr))        ? $arr['hubloc_addr']        : ''),
		'hubloc_network'     => ((array_key_exists('hubloc_network',$arr))     ? $arr['hubloc_network']     : ''),
		'hubloc_flags'       => ((array_key_exists('hubloc_flags',$arr))       ? $arr['hubloc_flags']       : 0),
		'hubloc_status'      => ((array_key_exists('hubloc_status',$arr))      ? $arr['hubloc_status']      : 0),
		'hubloc_url'         => ((array_key_exists('hubloc_url',$arr))         ? $arr['hubloc_url']         : ''),
		'hubloc_url_sig'     => ((array_key_exists('hubloc_url_sig',$arr))     ? $arr['hubloc_url_sig']     : ''),
		'hubloc_host'        => ((array_key_exists('hubloc_host',$arr))        ? $arr['hubloc_host']        : ''),
		'hubloc_callback'    => ((array_key_exists('hubloc_callback',$arr))    ? $arr['hubloc_callback']    : ''),
		'hubloc_connect'     => ((array_key_exists('hubloc_connect',$arr))     ? $arr['hubloc_connect']     : ''),
		'hubloc_sitekey'     => ((array_key_exists('hubloc_sitekey',$arr))     ? $arr['hubloc_sitekey']     : ''),
		'hubloc_updated'     => ((array_key_exists('hubloc_updated',$arr))     ? $arr['hubloc_updated']     : NULL_DATE),
		'hubloc_connected'   => ((array_key_exists('hubloc_connected',$arr))   ? $arr['hubloc_connected']   : NULL_DATE),
		'hubloc_primary'     => ((array_key_exists('hubloc_primary',$arr))     ? $arr['hubloc_primary']     : 0),
		'hubloc_orphancheck' => ((array_key_exists('hubloc_orphancheck',$arr)) ? $arr['hubloc_orphancheck'] : 0),
		'hubloc_error'       => ((array_key_exists('hubloc_error',$arr))       ? $arr['hubloc_error']       : 0),
		'hubloc_deleted'     => ((array_key_exists('hubloc_deleted',$arr))     ? $arr['hubloc_deleted']     : 0)
	];

	return create_table_from_array('hubloc', $store);
}

function site_store_lowlevel($arr) {

	$store = [
		'site_url'        => ((array_key_exists('site_url',$arr))        ? $arr['site_url']         : ''),
		'site_access'     => ((array_key_exists('site_access',$arr))     ? $arr['site_access']      : 0),
		'site_flags'      => ((array_key_exists('site_flags',$arr))      ? $arr['site_flags']       : 0),
		'site_update'     => ((array_key_exists('site_update',$arr))     ? $arr['site_update']      : NULL_DATE),
		'site_pull'       => ((array_key_exists('site_pull',$arr))       ? $arr['site_pull']        : NULL_DATE),
		'site_sync'       => ((array_key_exists('site_sync',$arr))       ? $arr['site_sync']        : NULL_DATE),
		'site_directory'  => ((array_key_exists('site_directory',$arr))  ? $arr['site_directory']   : ''),
		'site_register'   => ((array_key_exists('site_register',$arr))   ? $arr['site_register']    : 0),
		'site_sellpage'   => ((array_key_exists('site_sellpage',$arr))   ? $arr['site_sellpage']    : ''),
		'site_location'   => ((array_key_exists('site_location',$arr))   ? $arr['site_location']    : ''),
		'site_realm'      => ((array_key_exists('site_realm',$arr))      ? $arr['site_realm']       : ''),
		'site_valid'      => ((array_key_exists('site_valid',$arr))      ? $arr['site_valid']       : 0),
		'site_dead'       => ((array_key_exists('site_dead',$arr))       ? $arr['site_dead']        : 0),
		'site_type'       => ((array_key_exists('site_type',$arr))       ? $arr['site_type']        : 0),
		'site_project'    => ((array_key_exists('site_project',$arr))    ? $arr['site_project']     : ''),
		'site_version'    => ((array_key_exists('site_version',$arr))    ? $arr['site_version']     : ''),
		'site_crypto'     => ((array_key_exists('site_crypto',$arr))     ? $arr['site_crypto']      : '')
	];

	return create_table_from_array('site', $store);
}


function prune_hub_reinstalls() {

	$r = q("select site_url from site where site_type = %d",
		intval(SITE_TYPE_ZOT)
	);
	if($r) {
		foreach($r as $rr) {
			$x = q("select count(*) as t, hubloc_sitekey, max(hubloc_connected) as c from hubloc where hubloc_url = '%s' group by hubloc_sitekey order by c",
				dbesc($rr['site_url'])
			);

			// see if this url has more than one sitekey, indicating it has been re-installed.

			if(count($x) > 1) {
				$d1 = datetime_convert('UTC', 'UTC', $x[0]['c']);
				$d2 = datetime_convert('UTC', 'UTC', 'now - 3 days');

				// allow some slop period, say 3 days - just in case this is a glitch or transient occurrence
				// Then remove any hublocs pointing to the oldest entry.

				if(($d1 < $d2) && ($x[0]['hubloc_sitekey'])) {
					logger('prune_hub_reinstalls: removing dead hublocs at ' . $rr['site_url']);
					$y = q("delete from hubloc where hubloc_sitekey = '%s'",
						dbesc($x[0]['hubloc_sitekey'])
					);
				}
			}
		}
	}
}


/**
 * @brief Remove obsolete hublocs.
 *
 * Get rid of any hublocs which are ours but aren't valid anymore -
 * e.g. they point to a different and perhaps transient URL that we aren't using.
 *
 * I need to stress that this shouldn't happen. fix_system_urls() fixes hublocs
 * when it discovers the URL has changed. So it's unclear how we could end up
 * with URLs pointing to the old site name. But it happens. This may be an artifact
 * of an old bug or maybe a regression in some newer code. In any event, they
 * mess up communications and we have to take action if we find any.
 */
function remove_obsolete_hublocs() {

	logger('remove_obsolete_hublocs', LOGGER_DEBUG);

	// First make sure we have any hublocs (at all) with this URL and sitekey.
	// We don't want to perform this operation while somebody is in the process
	// of renaming their hub or installing certs.

	$r = q("select hubloc_id from hubloc where hubloc_url = '%s' and hubloc_sitekey = '%s'",
		dbesc(z_root()),
		dbesc(get_config('system', 'pubkey'))
	);
	if((! $r) || (! count($r)))
		return;

	// Good. We have at least one *valid* hubloc.

	// Do we have any invalid ones?

	$r = q("select hubloc_id from hubloc where hubloc_sitekey = '%s' and hubloc_url != '%s'",
		dbesc(get_config('system', 'pubkey')),
		dbesc(z_root())
	);
	$p = q("select hubloc_id from hubloc where hubloc_sitekey != '%s' and hubloc_url = '%s'",
		dbesc(get_config('system', 'pubkey')),
		dbesc(z_root())
	);
	if(is_array($r) && is_array($p))
		$r = array_merge($r, $p);

	if(! $r)
		return;

	// We've got invalid hublocs. Get rid of them.

	logger('remove_obsolete_hublocs: removing ' . count($r) . ' hublocs.');

	$interval = ((get_config('system', 'delivery_interval') !== false)
			? intval(get_config('system', 'delivery_interval')) : 2 );

	foreach($r as $rr) {
		q("update hubloc set hubloc_deleted = 1 where hubloc_id = %d",
			intval($rr['hubloc_id'])
		);

		$x = q("select channel_id from channel where channel_hash = '%s' limit 1",
			dbesc($rr['hubloc_hash'])
		);
		if($x) {
			Zotlabs\Daemon\Master::Summon(array('Notifier', 'location', $x[0]['channel_id']));
			if($interval)
				@time_sleep_until(microtime(true) + (float) $interval);
		}
	}
}


/**
 * @brief Change primary hubloc.
 *
 * This actually changes other structures to match the given (presumably current)
 * hubloc primary selection.
 *
 * @param array $hubloc
 * @return boolean
 */
function hubloc_change_primary($hubloc) {

	if(! is_array($hubloc)) {
		logger('no hubloc');
		return false;
	}
	if(! (intval($hubloc['hubloc_primary']))) {
		logger('not primary: ' . $hubloc['hubloc_url']);
		return false;
	}

	logger('setting primary: ' . $hubloc['hubloc_url']);

	// See if there's a local channel

	$r = q("select channel_id, channel_primary from channel where channel_hash = '%s' limit 1",
		dbesc($hubloc['hubloc_hash'])
	);
	if($r) {
		if(! $r[0]['channel_primary']) {
			q("update channel set channel_primary = 1 where channel_id = %d",
				intval($r[0]['channel_id'])
			);
		}
		else {
			q("update channel set channel_primary = 0 where channel_id = %d",
				intval($r[0]['channel_id'])
			);
		}
	}

	// do we even have an xchan for this hubloc and if so is it already set as primary?

	$r = q("select * from xchan where xchan_hash = '%s' limit 1",
		dbesc($hubloc['hubloc_hash'])
	);
	if(! $r) {
		logger('xchan not found');
		return false;
	}
	if($r[0]['xchan_addr'] === $hubloc['hubloc_addr']) {
		logger('xchan already changed');
		return false;
	}

	$url = $hubloc['hubloc_url'];
	$lwebbie = substr($hubloc['hubloc_addr'], 0, strpos($hubloc['hubloc_addr'], '@'));

	$r = q("update xchan set xchan_addr = '%s', xchan_url = '%s', xchan_follow = '%s', xchan_connurl = '%s' where xchan_hash = '%s'",
		dbesc($hubloc['hubloc_addr']),
		dbesc($url . '/channel/' . $lwebbie),
		dbesc($url . '/follow?f=&url=%s'),
		dbesc($url . '/poco/' . $lwebbie),
		dbesc($hubloc['hubloc_hash'])
	);
	if(! $r)
		logger('xchan_update failed.');

	logger('primary hubloc changed.' . print_r($hubloc, true), LOGGER_DEBUG);
	return true;
}


/**
 * @brief Mark a hubloc as down.
 *
 * We use the post url to distinguish between http and https hublocs.
 * The https might be alive, and the http dead.
 *
 * @param string $posturl Hubloc callback url which to disable
 */
function hubloc_mark_as_down($posturl) {
	$r = q("update hubloc set hubloc_status = ( hubloc_status | %d ) where hubloc_callback = '%s'",
		intval(HUBLOC_OFFLINE),
		dbesc($posturl)
	);
}


function ping_site($url) {

		$ret = array('success' => false);

		$sys = get_sys_channel();

		$m = zot_build_packet($sys, 'ping');
		$r = zot_zot($url . '/post', $m);
		if(! $r['success']) {
			$ret['message'] = 'no answer from ' . $url;
			return $ret;
		}
		$packet_result = json_decode($r['body'], true);
		if(! $packet_result['success']) {
			$ret['message'] = 'packet failure from ' . $url;
			return $ret;
		}

		if($packet_result['success']) {
			$ret['success'] = true;
		}
		else {
			$ret['message'] = 'unknown error from ' . $url;
		}

		return $ret;
}