void main () {
    var session = new Soup.Session ();
    initialize_user_agent (session);

    var message =
      new Soup.Message ("GET", "https://www.youtube.com/watch?v=g2cF4-tHvqI");
    session.send_message (message);

    var youtube_response = (string) message.response_body.data;

    var regex = /ytInitialPlayerResponse\s*=\s*({.+?})\s*;/;

    MatchInfo info;
    regex.match (youtube_response, 0, out info);
    var json_parser = new Json.Parser ();
    json_parser.load_from_data ( info.fetch (1), -1 );
    var yt_initial_player_response = json_parser.get_root ().get_object ();
    var streaming_data = yt_initial_player_response.get_object_member("streamingData");
    var adaptive_formats = streaming_data.get_array_member("formats");
    adaptive_formats.foreach_element((format) => {
        print ("%lld\n", format.get_object_element (0).get_int_member ("itag"));
    });
//    print ("%s\n", info.fetch (1));
}

void initialize_user_agent (Soup.Session session) {
    var cookie_jar = new Soup.CookieJar ();
    session.add_feature (cookie_jar);

    do_main_page_youtube_request (session);

    if (!has_consent (cookie_jar)) {
    print ("No consent found\n");
    consent (cookie_jar);
  }
}

void consent (Soup.CookieJar cookie_jar) {
    var youtube_uri = new Soup.URI ("https://youtube.com");
    var cookies = cookie_jar.get_cookie_list (youtube_uri, false);

    unowned var cookie = cookies.search<string> ("CONSENT", (cookie, name) => {
        return cookie.name == name ? 0 : 1;
    });

    if (cookie == null || is_consent_yes (cookie.data))
    return;

    var consent_id = extract_consent_id (cookie.data);
    var new_cookie_value = "YES+cb.20210328-17-p0.en+FX+" + consent_id;

    cookie_jar.delete_cookie (cookie.data);
    cookie_jar.add_cookie (
      new Soup.Cookie ("CONSENT", new_cookie_value, ".youtube.com", "/", -1));
}

string extract_consent_id (Soup.Cookie cookie) {
    var regex = /^PENDING\+(\d+)/;

    MatchInfo info;
    regex.match (cookie.@value, 0, out info);

    return info.fetch (1);
}

bool is_consent_yes (Soup.Cookie cookie) {
    var regex = /YES/;
    return regex.match (cookie.@value);
}

bool has_consent (Soup.CookieJar cookie_jar) {
    var youtube_uri = new Soup.URI ("https://youtube.com");
    var cookies = cookie_jar.get_cookie_list (youtube_uri, false);

    foreach (var cookie in cookies) {
    if (cookie.name == "__Secure-3PSID")
      return true;
  }

    return false;
}

void do_main_page_youtube_request (Soup.Session session) {
    var message = new Soup.Message ("GET", "https://www.youtube.com");
    session.send_message (message);
}