<?php
	// requires php-curl

	require_once 'getenv.php';
	require_once 'utils/utils.php';
	require_once 'servers/known-servers.php';
	require_once 'utils/servers-rooms.php';

	// Not required
	include_once "$LANGUAGES_ROOT/language_flags.php";

	/**
	 * Fetch online Communities and write the resulting data to disk.
	 * Communities are fetched as follows:
	 *
	 * 1. Get join links from our sources
	 * 2. Parse join links into servers
	 * 3. Add hardcoded servers
	 * 4. De-dupe servers based on base URL
	 * 5. Fetch server rooms and pubkey
	 * 6. De-dupe servers based on pubkey
	 */
	function main() {
		global $CACHE_ROOT, $ROOMS_FILE, $KNOWN_SERVERS, $KNOWN_PUBKEYS;

		// Create default directories with conservative permissions.
		file_exists($CACHE_ROOT) or mkdir($CACHE_ROOT, 0700);

		// Query our sources and store the resulting HTML.
		// TODO: Tag information is currently discarded. Feature needs triage.
		$html_pages = query_known_sources();
		// Find join links in each HTML document and merge the resulting arrays.
		$join_links = array_merge([], ...array_map('parse_join_links', $html_pages));

		/**
		 * @var CommunityServer[] $servers
		 */
		$servers = CommunityServer::from_join_urls($join_links);

		// Add known hosts.
		$servers = [...CommunityServer::from_known_hosts($KNOWN_SERVERS, $KNOWN_PUBKEYS), ...$servers];

		// Merge servers with the same URL.
		$servers = CommunityServer::dedupe_by_url($servers);

		// Fetch server data and filter unreachable servers.
		$servers = CommunityServer::poll_reachable($servers);

		// Merge servers with the same public key.
		$servers = CommunityServer::dedupe_by_pubkey($servers);

		// Count servers and rooms.
		$servers_total = count($servers);
		$rooms_total = count_rooms($servers);

		log_info("Done fetching communities.");
		log_info(
			"Found $rooms_total unique Session Communities " .
			"on $servers_total servers." . PHP_EOL
		);

		// Output fetching results to file.
		file_put_contents($ROOMS_FILE, json_encode($servers));
	}

	/**
	 * Fetches known sources of Session Community join links.
	 * @return string[] HTML pages containing join URLs.
	 */
	function query_known_sources(): array {
		global $SOURCES;

		log_info("Requesting Awesome Session Group list...");
		$pages_asgl[] = file_get_contents($SOURCES['ASGL']);
		log_debug($http_response_header[0]); // Supposed to be "HTTP/1.1 200 OK"

		log_info("Requesting Lokilocker Mods Open Group list...");
		$pages_loki[] = file_get_contents($SOURCES['LOKI']);
		log_debug($http_response_header[0]); // Supposed to be "HTTP/1.1 200 OK"

		log_info("Requesting session.directory list...");
		$pages_sdir = [];
		$json_sdir = json_decode(file_get_contents($SOURCES['SDIR-JSON']));
		log_debug($http_response_header[0]); // Supposed to be "HTTP/1.1 200 OK"
		foreach ($json_sdir as $room) $pages_sdir[] = $room->url;

		log_info("Requesting FreeArkham.cc list...");
		$pages_fark[] = file_get_contents($SOURCES['FARK']);
		log_debug($http_response_header[0]); // Supposed to be "HTTP/1.1 200 OK"

		log_info('Done fetching sources.');

		return [...$pages_asgl, ...$pages_loki, ...$pages_sdir, ...$pages_fark];
	}

	/**
	 * Debug function to see which communities use pinned messages already
	 * @deprecated
	 */
	function print_pinned_messages($room_assignments_arr) {
		// for each server a.k.a. public key do
		foreach($room_assignments_arr as $pubkey => $room_assignment) {
			// for every room do
			foreach($room_assignment[1] as $room_array) {
				// info:
				// $room_array = array(
				//	"token"        => bla,
				//	"name"         => Blabla,
				//	"active_users" => -1,
				//	"description"  => Blabla bla bla
				//);
				$server_url = $room_assignment[0];
				$room_json_url = $server_url . "/room/" . $room_array["token"];
				echo($room_json_url . PHP_EOL);
				$contents = file_get_contents($room_json_url);
				if($contents) {
//					print_r($contents);
					$json_obj = json_decode($contents);
					$pinned_messages = $json_obj->pinned_messages;
					echo("Pinned messages:" . PHP_EOL);
					print_r($pinned_messages);
				}
			}
		}
	}

	// Fetch servers
	main();

?>