<?php

namespace App\Chat;

/** A room (chat_rooms) with its members and its last sentences (chat_sentences). */
final class Room
{
    /** "un salon, quel que soit son type, ne peut accueillir plus de 32 personnes" (the help of the chat, 1999) */
    public const MAX_MEMBERS = 32;
    public const HISTORY = 15;

    /** @var array<string, User> by id */
    public array $members = [];

    /** @var array<string, float> who signalled a behaviour problem here, and when (550) */
    public array $reports = [];

    /** @var list<array{id: string, nickname: string, text: string, at: int}> */
    public array $history = [];

    public function __construct(
        public readonly string $name,
        public readonly int $type,
        public readonly string $creator,
        public bool $permanent = false,
        public int $createdAt = 0,
    ) {
        $this->createdAt = $createdAt ?: time();
    }

    public function key(): string
    {
        return self::keyOf($this->name, $this->type);
    }

    public static function keyOf(string $name, int $type): string
    {
        return $type . '|' . mb_strtolower($name);
    }

    public function count(): int
    {
        return count($this->members);
    }

    public function isFull(): bool
    {
        return $this->count() >= self::MAX_MEMBERS;
    }

    public function remember(User $user, string $text): void
    {
        $this->history[] = ['id' => $user->id, 'nickname' => $user->nickname, 'text' => $text, 'at' => time()];
        if (count($this->history) > self::HISTORY) {
            $this->history = array_slice($this->history, -self::HISTORY);
        }
    }

    /** The room as a room list shows it: name, "?", creator, members. */
    public function listEntry(): array
    {
        return [$this->name, '?', $this->creator, (string)$this->count()];
    }
}