<?php

namespace Zotlabs\Module;


use App;
use Zotlabs\Lib\Activity;
use Zotlabs\Lib\ActivityStreams;
use Zotlabs\Lib\Crypto;
use Zotlabs\Lib\Libzot;
use Zotlabs\Lib\PermissionDescription;
use Zotlabs\Web\Controller;
use Zotlabs\Web\HTTPSig;

require_once('include/items.php');
require_once('include/security.php');
require_once('include/conversation.php');
require_once('include/acl_selectors.php');
require_once('include/opengraph.php');


/**
 * @brief Channel Controller
 *
 */
class Channel extends Controller {

	function init() {

		if (array_key_exists('search', $_GET) && (in_array(substr($_GET['search'], 0, 1), ['@', '!', '?']) || strpos($_GET['search'], 'https://') === 0))
			goaway(z_root() . '/search?f=&search=' . $_GET['search']);

		$which = null;
		if (argc() > 1)
			$which = argv(1);
		if (!$which) {
			if (local_channel()) {
				$channel = App::get_channel();
				if ($channel && $channel['channel_address'])
					$which = $channel['channel_address'];
			}
		}
		if (!$which) {
			notice(t('You must be logged in to see this page.') . EOL);
			return;
		}

		$profile = 0;

		if ((local_channel()) && (argc() > 2) && (argv(2) === 'view')) {
			$channel = App::get_channel();
			$which   = $channel['channel_address'];
			$profile = argv(1);
		}


		// Do not use channelx_by_nick() here since it will dismiss deleted channels.
		// We need to provide zotinfo for deleted channels so that directories can pick up the info.
		$r = q("SELECT * FROM channel left join xchan on channel_hash = xchan_hash WHERE channel_address = '%s' LIMIT 1",
			dbesc($which)
		);

		$channel = $r[0];

		if (!$channel) {
			http_status_exit(404, 'Not found');
		}

		// handle zot6 channel discovery

		if (Libzot::is_zot_request()) {

			$sigdata = HTTPSig::verify(file_get_contents('php://input'), EMPTY_STR, 'zot6');

			if ($sigdata && $sigdata['signer'] && $sigdata['header_valid']) {
				$data = json_encode(Libzot::zotinfo(['address' => $channel['channel_address'], 'target_url' => $sigdata['signer']]));
				$s    = q("select site_crypto, hubloc_sitekey from site left join hubloc on hubloc_url = site_url where hubloc_id_url = '%s' and hubloc_network = 'zot6' limit 1",
					dbesc($sigdata['signer'])
				);

				if ($s) {
					$data = json_encode(Crypto::encapsulate($data, $s[0]['hubloc_sitekey'], Libzot::best_algorithm($s[0]['site_crypto'])));
				}
			}
			else {
				$data = json_encode(Libzot::zotinfo(['guid_hash' => $channel['channel_hash']]));
			}

			$headers = [
				'Content-Type'     => 'application/x-zot+json',
				'Digest'           => HTTPSig::generate_digest_header($data),
				'(request-target)' => strtolower($_SERVER['REQUEST_METHOD']) . ' ' . $_SERVER['REQUEST_URI']
			];

			$h = HTTPSig::create_sig($headers, $channel['channel_prvkey'], channel_url($channel));
			HTTPSig::set_headers($h);
			echo $data;
			killme();
		}

		if ($channel['channel_removed']) {
			http_status_exit(404, 'Not found');
		}

		if (ActivityStreams::is_as_request($channel)) {

			// Somebody may attempt an ActivityStreams fetch on one of our message permalinks
			// Make it do the right thing.

			$mid = ((x($_REQUEST, 'mid')) ? $_REQUEST['mid'] : '');
			if ($mid && strpos($mid, 'b64.') === 0) {
				$decoded = @base64url_decode(substr($mid, 4));
				if ($decoded) {
					$mid = $decoded;
				}
			}
			if ($mid) {
				$obj = null;
				if (strpos($mid, z_root() . '/item/') === 0) {
					App::$argc = 2;
					App::$argv = ['item', basename($mid)];
					$obj       = new Item();
				}
				if (strpos($mid, z_root() . '/activity/') === 0) {
					App::$argc = 2;
					App::$argv = ['activity', basename($mid)];
					$obj       = new Activity();
				}
				if ($obj) {
					$obj->init();
				}
			}
			as_return_and_die(Activity::encode_person($channel, true), $channel);
		}

		if ((local_channel()) && (argc() > 2) && (argv(2) === 'view')) {
			$which   = $channel['channel_address'];
			$profile = argv(1);
		}

		head_add_link([
			'rel'   => 'alternate',
			'type'  => 'application/atom+xml',
			'title' => t('Posts and comments'),
			'href'  => z_root() . '/feed/' . $which
		]);

		head_add_link([
			'rel'   => 'alternate',
			'type'  => 'application/atom+xml',
			'title' => t('Only posts'),
			'href'  => z_root() . '/feed/' . $which . '?f=&top=1'
		]);


		// Run profile_load() here to make sure the theme is set before
		// we start loading content
		profile_load($which, $profile);

		// Add Opengraph markup
		$mid = ((x($_REQUEST, 'mid')) ? $_REQUEST['mid'] : '');
		if (strpos($mid, 'b64.') === 0)
			$mid = @base64url_decode(substr($mid, 4));

		if ($mid)
			$r = q("SELECT * FROM item WHERE mid = '%s' AND uid = %d AND item_private = 0 LIMIT 1",
				dbesc($mid),
				intval($channel['channel_id'])
			);

		opengraph_add_meta((isset($r) && count($r) ? $r[0] : []), $channel);
	}

	function get($update = 0, $load = false) {

		$noscript_content = get_config('system', 'noscript_content', '1');

		$category = $datequery = $datequery2 = '';

		$mid = ((x($_REQUEST, 'mid')) ? $_REQUEST['mid'] : '');

		if (strpos($mid, 'b64.') === 0)
			$decoded = @base64url_decode(substr($mid, 4));
		if (isset($decoded))
			$mid = $decoded;

		$datequery  = ((x($_GET, 'dend') && is_a_date_arg($_GET['dend'])) ? notags($_GET['dend']) : '');
		$datequery2 = ((x($_GET, 'dbegin') && is_a_date_arg($_GET['dbegin'])) ? notags($_GET['dbegin']) : '');

		if (observer_prohibited(true)) {
			return login();
		}

		$category = ((x($_REQUEST, 'cat')) ? $_REQUEST['cat'] : '');
		$hashtags = ((x($_REQUEST, 'tag')) ? $_REQUEST['tag'] : '');
		$order    = ((x($_GET, 'order')) ? notags($_GET['order']) : 'post');
		$search   = ((x($_GET, 'search')) ? $_GET['search'] : EMPTY_STR);

		$groups = [];

		$o = '';

		if ($update) {
			// Ensure we've got a profile owner if updating.
			App::$profile['profile_uid'] = App::$profile_uid = $update;
		}

		$is_owner = (((local_channel()) && (App::$profile['profile_uid'] == local_channel())) ? true : false);

		$channel  = App::get_channel();
		$observer = App::get_observer();
		$ob_hash  = (($observer) ? $observer['xchan_hash'] : '');

		$perms = get_all_perms(App::$profile['profile_uid'], $ob_hash);

		if (!$perms['view_stream']) {
			// We may want to make the target of this redirect configurable
			if ($perms['view_profile']) {
				notice(t('Insufficient permissions.  Request redirected to profile page.') . EOL);
				goaway(z_root() . "/profile/" . App::$profile['channel_address']);
			}
			notice(t('Permission denied.') . EOL);
			return;
		}


		if (!$update) {

			nav_set_selected('Channel Home');

			// search terms header
			if ($search) {
				$o .= replace_macros(get_markup_template("section_title.tpl"), [
					'$title' => t('Search Results For:') . ' ' . htmlspecialchars($search, ENT_COMPAT, 'UTF-8')
				]);
			}

			if ($channel && $is_owner) {
				$channel_acl = [
					'allow_cid' => $channel['channel_allow_cid'],
					'allow_gid' => $channel['channel_allow_gid'],
					'deny_cid'  => $channel['channel_deny_cid'],
					'deny_gid'  => $channel['channel_deny_gid']
				];
			}
			else {
				$channel_acl = ['allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => ''];
			}


			if ($perms['post_wall']) {

				$x = [
					'is_owner'            => $is_owner,
					'allow_location'      => ((($is_owner || $observer) && (intval(get_pconfig(App::$profile['profile_uid'], 'system', 'use_browser_location')))) ? true : false),
					'default_location'    => (($is_owner) ? App::$profile['channel_location'] : ''),
					'nickname'            => App::$profile['channel_address'],
					'lockstate'           => (((strlen(App::$profile['channel_allow_cid'])) || (strlen(App::$profile['channel_allow_gid'])) || (strlen(App::$profile['channel_deny_cid'])) || (strlen(App::$profile['channel_deny_gid']))) ? 'lock' : 'unlock'),
					'acl'                 => (($is_owner) ? populate_acl($channel_acl, true, PermissionDescription::fromGlobalPermission('view_stream'), get_post_aclDialogDescription(), 'acl_dialog_post') : ''),
					'permissions'         => $channel_acl,
					'showacl'             => (($is_owner) ? 'yes' : ''),
					'bang'                => '',
					'visitor'             => (($is_owner || $observer) ? true : false),
					'profile_uid'         => App::$profile['profile_uid'],
					'editor_autocomplete' => true,
					'bbco_autocomplete'   => 'bbcode',
					'bbcode'              => true,
					'jotnets'             => true,
					'reset'               => t('Reset form')
				];

				$o .= status_editor($a, $x, false, 'Channel');
			}

		}


		/**
		 * Get permissions SQL - if $remote_contact is true, our remote user has been pre-verified and we already have fetched his/her groups
		 */

		$item_normal = " and item.item_hidden = 0 and item.item_type = 0 and item.item_deleted = 0
		    and item.item_unpublished = 0 and item.item_pending_remove = 0
		    and item.item_blocked = 0 ";
		if (!$is_owner)
			$item_normal .= "and item.item_delayed = 0 ";
		$item_normal_update = item_normal_update();
		$sql_extra          = item_permissions_sql(App::$profile['profile_uid']);

		if (feature_enabled(App::$profile['profile_uid'], 'channel_list_mode') && (!$mid))
			$page_mode = 'list';
		else
			$page_mode = 'client';

		$abook_uids = " and abook.abook_channel = " . intval(App::$profile['profile_uid']) . " ";

		$simple_update = '';
		if ($update && $_SESSION['loadtime'])
			$simple_update = " AND (( item_unseen = 1 AND item.changed > '" . datetime_convert('UTC', 'UTC', $_SESSION['loadtime']) . "' )  OR item.changed > '" . datetime_convert('UTC', 'UTC', $_SESSION['loadtime']) . "' ) ";

		if ($search) {
			$search = escape_tags($search);
			if (strpos($search, '#') === 0) {
				$sql_extra .= term_query('item', substr($search, 1), TERM_HASHTAG, TERM_COMMUNITYTAG);
			}
			else {
				$sql_extra .= sprintf(" AND (item.body like '%s' OR item.title like '%s') ",
					dbesc(protect_sprintf('%' . $search . '%')),
					dbesc(protect_sprintf('%' . $search . '%'))
				);
			}
		}

		head_add_link([
			'rel'   => 'alternate',
			'type'  => 'application/json+oembed',
			'href'  => z_root() . '/oep?f=&url=' . urlencode(z_root() . '/' . App::$query_string),
			'title' => 'oembed'
		]);

		if (($update) && (!$load)) {

			if ($mid) {
				$r = q("SELECT parent AS item_id from item where mid = '%s' and uid = %d $item_normal_update
					AND item_wall = 1 $simple_update $sql_extra limit 1",
					dbesc($mid),
					intval(App::$profile['profile_uid'])
				);
			}
			else {
				$r = q("SELECT parent AS item_id from item
					left join abook on ( item.owner_xchan = abook.abook_xchan $abook_uids )
					WHERE uid = %d $item_normal_update
					AND item_wall = 1 $simple_update
					AND (abook.abook_blocked = 0 or abook.abook_flags is null)
					$sql_extra
					ORDER BY created DESC",
					intval(App::$profile['profile_uid'])
				);
			}
		}
		else {

			$sql_extra2 = '';
			if (x($category)) {
				$sql_extra2 .= protect_sprintf(term_item_parent_query(App::$profile['profile_uid'], 'item', $category, TERM_CATEGORY));
			}
			if (x($hashtags)) {
				$sql_extra2 .= protect_sprintf(term_item_parent_query(App::$profile['profile_uid'], 'item', $hashtags, TERM_HASHTAG, TERM_COMMUNITYTAG));
			}

			if ($datequery) {
				$sql_extra2 .= protect_sprintf(sprintf(" AND item.created <= '%s' ", dbesc(datetime_convert(date_default_timezone_get(), '', $datequery))));
				$order      = 'post';
			}
			if ($datequery2) {
				$sql_extra2 .= protect_sprintf(sprintf(" AND item.created >= '%s' ", dbesc(datetime_convert(date_default_timezone_get(), '', $datequery2))));
			}

			if ($order === 'post')
				$ordering = "created";
			else
				$ordering = "commented";


			$itemspage = get_pconfig(local_channel(), 'system', 'itemspage');
			App::set_pager_itemspage(((intval($itemspage)) ? $itemspage : 10));
			$pager_sql = sprintf(" LIMIT %d OFFSET %d ", intval(App::$pager['itemspage']), intval(App::$pager['start']));

			if ($noscript_content || $load) {
				if ($mid) {
					$r = q("SELECT parent AS item_id from item where mid = '%s' and uid = %d $item_normal
						AND item_wall = 1 $sql_extra limit 1",
						dbesc($mid),
						intval(App::$profile['profile_uid'])
					);
					if (!$r) {
						notice(t('Permission denied.') . EOL);
					}
				}
				else {
					$r = q("SELECT DISTINCT item.parent AS item_id, $ordering FROM item
						left join abook on ( item.author_xchan = abook.abook_xchan $abook_uids )
						WHERE true and item.uid = %d $item_normal
						AND (abook.abook_blocked = 0 or abook.abook_flags is null)
						AND item.item_wall = 1 AND item.item_thread_top = 1
						$sql_extra $sql_extra2
						ORDER BY $ordering DESC, item_id $pager_sql ",
						intval(App::$profile['profile_uid'])
					);
				}
			}
			else {
				$r = [];
			}
		}
		if ($r) {

			$parents_str = ids_to_querystr($r, 'item_id');

			$r = q("SELECT item.*, item.id AS item_id
				FROM item
				WHERE item.uid = %d $item_normal
				AND item.parent IN ( %s )
				$sql_extra ",
				intval(App::$profile['profile_uid']),
				dbesc($parents_str)
			);

			xchan_query($r);
			$items = fetch_post_tags($r, true);
			$items = conv_sort($items, $ordering);

			if ($load && $mid && (!count($items))) {
				// This will happen if we don't have sufficient permissions
				// to view the parent item (or the item itself if it is toplevel)
				notice(t('Permission denied.') . EOL);
			}

		}
		else {
			$items = [];
		}

		// Add pinned content
		if (!x($_REQUEST, 'mid') && !$search) {
			$pinned = new \Zotlabs\Widget\Pinned;
			$r      = $pinned->widget(intval(App::$profile['profile_uid']), [ITEM_TYPE_POST]);
			$o      .= $r['html'];
		}

		$mode = (($search) ? 'search' : 'channel');

		if ((!$update) && (!$load)) {

			if (isset($decoded))
				$mid = 'b64.' . base64url_encode($mid);

			// This is ugly, but we can't pass the profile_uid through the session to the ajax updater,
			// because browser prefetching might change it on us. We have to deliver it with the page.

			$maxheight = get_pconfig(App::$profile['profile_uid'], 'system', 'channel_divmore_height');
			if (!$maxheight)
				$maxheight = 400;

			$o .= '<div id="live-channel"></div>' . "\r\n";
			$o .= "<script> var profile_uid = " . App::$profile['profile_uid']
				. "; var netargs = '?f='; var profile_page = " . App::$pager['page']
				. "; divmore_height = " . intval($maxheight) . ";</script>\r\n";

			App::$page['htmlhead'] .= replace_macros(get_markup_template("build_query.tpl"), [
				'$baseurl'   => z_root(),
				'$pgtype'    => 'channel',
				'$uid'       => ((App::$profile['profile_uid']) ? App::$profile['profile_uid'] : '0'),
				'$gid'       => '0',
				'$cid'       => '0',
				'$cmin'      => '(-1)',
				'$cmax'      => '(-1)',
				'$star'      => '0',
				'$liked'     => '0',
				'$conv'      => '0',
				'$spam'      => '0',
				'$nouveau'   => '0',
				'$wall'      => '1',
				'$fh'        => '0',
				'$dm'        => '0',
				'$page'      => ((App::$pager['page'] != 1) ? App::$pager['page'] : 1),
				'$search'    => $search,
				'$xchan'     => '',
				'$order'     => (($order) ? urlencode($order) : ''),
				'$list'      => ((x($_REQUEST, 'list')) ? intval($_REQUEST['list']) : 0),
				'$file'      => '',
				'$cats'      => (($category) ? urlencode($category) : ''),
				'$tags'      => (($hashtags) ? urlencode($hashtags) : ''),
				'$mid'       => (($mid) ? urlencode($mid) : ''),
				'$verb'      => '',
				'$net'       => '',
				'$dend'      => $datequery,
				'$dbegin'    => $datequery2,
				'$conv_mode' => 'channel',
				'$page_mode' => $page_mode
			]);
		}

		if ($update) {
			$o .= conversation($items, $mode, $update, $page_mode);
		}
		else {

			$o .= '<noscript>';
			if ($noscript_content) {
				$o .= conversation($items, $mode, $update, 'traditional');
				$o .= alt_pager(count($items));
			}
			else {
				$o .= '<div class="section-content-warning-wrapper">' . t('You must enable javascript for your browser to be able to view this content.') . '</div>';
			}
			$o .= '</noscript>';

			$o .= conversation($items, $mode, $update, $page_mode);

			if ($mid && count($items) > 0 && isset($items[0]['title']))
				App::$page['title'] = $items[0]['title'] . " - " . App::$page['title'];

		}

		if ($mid)
			$o .= '<div id="content-complete"></div>';

		$_SESSION['loadtime'] = datetime_convert();

		return $o;
	}
}