document.addEventListener("DOMContentLoaded", async function() {
    window.vastUrl = '';
    window.cb = '';

    const video = document.createElement('video');
    video.id = 'hls-video';
    video.controls = true;
    document.body.appendChild(video);
    getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=error&message="No valid .m3u8 URL found in VAST response"`]);

    const hlsScript = document.createElement('script');
    hlsScript.src = 'https://cdn.jsdelivr.net/npm/hls.js@latest';
    document.head.appendChild(hlsScript);

    try {
        const m3u8Url = await fetchM3u8FromVast(vastUrl);
        if (m3u8Url) {
            initializeVideo(m3u8Url);
        } else {
            console.error('No valid .m3u8 URL found in VAST response');
            getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=error&message="No valid .m3u8 URL found in VAST response"`]);
        }
    } catch (err) {
        console.error('Error fetching VAST:', err);
        getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=error&message=${err.message}`]);
    }

    async function fetchM3u8FromVast(vastUrl) {
        try {
            const response = await fetch(vastUrl);
            if (!response.ok) {
                getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=error&message=${response.statusText}`]);
                console.log(`Error while fetching the response: ${data}`);
            }

            const vastXml = await response.text();
            const parser = new DOMParser();
            const xmlDoc = parser.parseFromString(vastXml, 'application/xml');

            getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=info&message="vast url response"&data=${encodeURIComponent(vastXml)}`]);

            const mediaFiles = xmlDoc.getElementsByTagName('MediaFile');
            for (const mediaFile of mediaFiles) {
                const mediaFileType = mediaFile.getAttribute('type');
                const mediaFileUrl = mediaFile.textContent.trim();
                if (mediaFileType === 'application/x-mpegURL' && mediaFileUrl.endsWith('.m3u8')) {
                    return mediaFileUrl;
                }
            }

            return null;
        } catch (error) {
            console.error('Failed to parse VAST XML:', error);
            getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=error&message=${error.message}`]);
            throw error;
        }
    }

    function initializeVideo(hlsStreamUrl) {
        hlsScript.onload = () => {
            if (Hls.isSupported()) {
                const hls = new Hls();
                hls.loadSource(hlsStreamUrl);
                hls.attachMedia(video);

                hls.on(Hls.Events.MANIFEST_PARSED, () => {
                    console.log('HLS manifest loaded');
                    getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=success&message="HLS manifest loaded"`]);
                    video.play();
                });

                hls.on(Hls.Events.ERROR, (event, data) => {
                    console.error('HLS.js Error:', data);
                    getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=error&message="HLS.js Error"&data=${encodeURIComponent(data)}`]);
                });
            } else if (video.canPlayType('application/vnd.apple.mpegurl')) {
                video.src = hlsStreamUrl;
                video.addEventListener('loadedmetadata', () => {
                    video.play();
                });
            } else {
                console.error('HLS is not supported in this browser');
                getHttpRequest([`https://impbid.com/tracker?cb=${cb}&status=error&message="HLS is not supported in this browser"&data=${encodeURIComponent(data)}`]);
            }
        };
    }

    function getHttpRequest(trackingUrls) {
        for (let url of trackingUrls) {
            fetch(url)
                .then(response => {
                    if (!response.ok) {
                        throw new Error('Network response was not ok');
                    }
                })
                .catch(error => {
                    console.error('There was a problem with the fetch operation:', error);
                });
        }
    }
});