import { genericUserAgent, maxVideoDuration } from "../config.js";

// TO-DO: quality picking
export default async function(obj) {
    try {
        let html = await fetch(`https://bilibili.com/video/${obj.id}`, {
            headers: {"user-agent": genericUserAgent}
        }).then((r) => { return r.text() }).catch(() => { return false });
        if (!html) {
            return { error: 'ErrorCouldntFetch' };
        }

        if (!(html.includes('<script>window.__playinfo__=') && html.includes('"video_codecid"'))) {
            return { error: 'ErrorEmptyDownload' };
        }
        let streamData = JSON.parse(html.split('<script>window.__playinfo__=')[1].split('</script>')[0]);
        if (streamData.data.timelength > maxVideoDuration) {
            return { error: ['ErrorLengthLimit', maxVideoDuration / 60000] };
        }

        let video = streamData["data"]["dash"]["video"].filter((v) => {
            if (!v["baseUrl"].includes("https://upos-sz-mirrorcosov.bilivideo.com/")) return true;
        }).sort((a, b) => Number(b.bandwidth) - Number(a.bandwidth));

        let audio = streamData["data"]["dash"]["audio"].filter((a) => {
            if (!a["baseUrl"].includes("https://upos-sz-mirrorcosov.bilivideo.com/")) return true;
        }).sort((a, b) => Number(b.bandwidth) - Number(a.bandwidth));

        return {
            urls: [video[0]["baseUrl"], audio[0]["baseUrl"]],
            time: streamData.data.timelength,
            audioFilename: `bilibili_${obj.id}_audio`,
            filename: `bilibili_${obj.id}_${video[0]["width"]}x${video[0]["height"]}.mp4`
        };
    } catch (e) {
        return { error: 'ErrorBadFetch' };
    }
}