<?php
	require_once 'php/servers/servers-rooms.php';
	require_once 'php/utils/utils.php';

	class RoomSieve {
		/**
		 * @var CommunityRoom[] $rooms;
		 */
		private array $rooms;

		/**
		 * @var CommunityRoom[] $stickied
		 */
		private array $stickies;

		/**
		 * @param CommunityRoom[] $rooms
		 * @param CommunityRoom[] $stickied
		 */
		private function __construct(array $rooms, array $stickied = []) {
			$this->rooms = $rooms;
			$this->stickies = $stickied;
		}

		public const TOP_DEFAULT = 35;

		/**
		 * @param CommunityRoom[] $rooms
		 */
		public static function takeRooms(array $rooms) {
			return new RoomSieve($rooms);
		}

		public function saveStickies() {
			$stickied = CommunityRoom::get_stickied_rooms($this->rooms, $rest);
			$rooms = $rest;
			return new RoomSieve($rooms, $stickied);
		}

		/**
		 * @param CommunityRoom[] $rooms
		 */
		public function addRooms(array $rooms) {
			return new RoomSieve(array_merge($this->rooms, $rooms), $this->stickies);
		}

		public function apply(Closure $filter) {
			return new RoomSieve($filter($this->rooms), $this->stickies);
		}

		public function getWithStickies() {
			return [...$this->stickies, ...$this->rooms];
		}

		public function getWithoutStickies() {
			return $this->saveStickies()->getRooms();
		}

		public function getRooms() {
			return $this->rooms;
		}

		public function onlyTop(int $count = RoomSieve::TOP_DEFAULT) {
			$rooms = $this->rooms;
			return new RoomSieve(array_slice(array_reverse($rooms), 0, $count), $this->stickies);
		}

		public function exceptTop(int $count = RoomSieve::TOP_DEFAULT) {
			$rooms = $this->rooms;
			CommunityRoom::sort_rooms_num($rooms, 'active_users');
			return new RoomSieve(array_slice(array_reverse($rooms), $count), $this->stickies);
		}

		private static function isIndexApproved(CommunityRoom $room): bool {
			return (
				!$room->rated_nsfw() &&
				$room->write &&
				!$room->has_poor_staff_rating() &&
				!empty($room->description)
			);
		}

		public function applyStandardSort() {
			$rooms = $this->rooms;
			CommunityRoom::sort_rooms_str($rooms, 'name');
			CommunityRoom::sort_rooms_by_server($rooms);
			return new RoomSieve($rooms, $this->stickies);
		}

		public function applyPreferentialSort() {
			$rooms = $this->rooms;
			CommunityRoom::sort_rooms_num($rooms,'created');
			usort($rooms, function($a, $b) {
				return empty($b->description) - empty($a->description);
			});
			usort($rooms, function(CommunityRoom $a, CommunityRoom $b) {
				return sign($a->get_numeric_staff_rating() - $b->get_numeric_staff_rating());
			});
			return new RoomSieve(array_reverse($rooms), $this->stickies);
		}

		public function indexApproved() {
			$rooms = array_values(array_filter($this->rooms, function($room) {
				return RoomSieve::isIndexApproved($room);
			}));
			return new RoomSieve($rooms, $this->stickies);
		}

		public function indexNonApproved() {
			$rooms = array_values(array_filter($this->rooms, function($room) {
				return !RoomSieve::isIndexApproved($room);
			}));
			return new RoomSieve($rooms, $this->stickies);
		}
	}
?>