func getListFromSlug(slug string) (*List, error) {
	list := List{}
	client := &http.Client{Transport: &http.Transport{}}
	data := url.Values{}
	data.Set("entity_slug", slug)
	data.Set("platform", "web")
	data.Add("ui", "012021")
	encodedData := data.Encode()

	req, err := newRequest("POST", "https://api.vieon.vn/backend/cm/v5/slug/episode",
		encodedData, "limit=50&platform=web&ui=012021")
	if err != nil {
		return nil, err
	}

	res, err := client.Do(req)
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()

	if err := decoder.NewStreamDecoder(res.Body).Decode(&list); err != nil {
		return nil, err
	}

	totalPages := (list.Metadata.Total + 49) / 50
	for i := 1; i < totalPages; i++ {
		temp := List{}
		req, err := newRequest("POST", "https://api.vieon.vn/backend/cm/v5/slug/episode",
			encodedData, fmt.Sprintf("page=%d&limit=50&platform=web&ui=012021", i))
		if err != nil {
			return nil, err
		}

		res, err := client.Do(req)
		if err != nil {
			return nil, err
		}
		defer res.Body.Close()

		if res.StatusCode == 200 {
			if err := json.NewDecoder(res.Body).Decode(&temp); err != nil {
				return nil, err
			}
			list.Episodes = append(list.Episodes, temp.Episodes...)
		}
	}
	return &list, nil
}

func newRequest(method, urlStr, data, query string) (*http.Request, error) {
	u, err := url.Parse(urlStr)
	if err != nil {
		return nil, err
	}
	u.RawQuery = query
	req, err := http.NewRequest(method, u.String(), strings.NewReader(data))
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	return req, nil
}

func getHls(url string) (string, error) {
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return "", err
	}
	req.Header = header

	res, err := httpClient.Do(req)
	if err != nil {
		return "", err
	}
	defer res.Body.Close()

	if res.StatusCode != http.StatusOK {
		return "", fmt.Errorf("unexpected status code: %d", res.StatusCode)
	}

	link := Link{}
	err = decoder.NewStreamDecoder(res.Body).Decode(&link)
	if err != nil {
		return "", err
	}
	if link.PlayLinks.H265.Hls != "" {
		return link.PlayLinks.H265.Hls, nil
	}
	return link.PlayLinks.H264.Hls, nil
}