<?php
declare(strict_types=1);

require_once __DIR__ . '/../multiplayer_data.php';

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');

function roomsApiRespond(array $payload, int $status = 200): void
{
    http_response_code($status);
    echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';

try {
    if ($method === 'GET') {
        $roomCode = (string) ($_GET['room_code'] ?? '');
        $room = multiplayerFetchRoomByCode($roomCode);
        if (!$room) {
            roomsApiRespond([
                'success' => false,
                'error' => 'Room not found or expired.',
            ], 404);
        }

        roomsApiRespond([
            'success' => true,
            'updated_at' => gmdate(DATE_ATOM),
            'room' => $room,
        ]);
    }

    if ($method !== 'POST') {
        roomsApiRespond([
            'success' => false,
            'error' => 'Method not allowed.',
        ], 405);
    }

    $action = strtolower(trim((string) ($_POST['action'] ?? '')));
    if ($action === 'create') {
        $room = multiplayerCreateRoom((string) ($_POST['player_name'] ?? ''));
        roomsApiRespond([
            'success' => true,
            'message' => 'Room created.',
            'updated_at' => gmdate(DATE_ATOM),
            'room' => $room,
        ], 201);
    }

    if ($action === 'join') {
        $room = multiplayerJoinRoom((string) ($_POST['room_code'] ?? ''), (string) ($_POST['player_name'] ?? ''));
        roomsApiRespond([
            'success' => true,
            'message' => 'Joined room.',
            'updated_at' => gmdate(DATE_ATOM),
            'room' => $room,
        ]);
    }

    roomsApiRespond([
        'success' => false,
        'error' => 'Unknown room action.',
    ], 422);
} catch (InvalidArgumentException $e) {
    roomsApiRespond([
        'success' => false,
        'error' => $e->getMessage(),
    ], 422);
} catch (Throwable $e) {
    roomsApiRespond([
        'success' => false,
        'error' => 'Unable to process the room request right now.',
    ], 500);
}