<?php

namespace App\Util;

use SplFileInfo;

class DanmakuUtil
{
    public static function parse_danmaku(string $file): array
    {
        $document = new \DOMDocument();
        $document->load($file);
        $danmaku_items = $document->getElementsByTagName("d");
        $result = [];
        /** @var \DOMNode $item */
        foreach ($danmaku_items as $item) {
            $paramsNode = $item->attributes->getNamedItem("p");
            $param_list = mb_split(",", $paramsNode->value);
            if (sizeof($param_list) < 7) {
                throw new \Exception("弹幕格式异常");
            }
            $userNode = $item->attributes->getNamedItem("user");
            $result[] = [
                "from" => $userNode->value,
                "from_mid" => $param_list[6],
                "content" => $item->textContent,
                "created_at" => intval($param_list[4])/1000,
            ];
        }
        return $result;
    }
}