public class SlackAPI {

    private static final boolean use = true;

    public static void send(String receiver, String message) {
        send(receiver, message, false);
    }

    public static void send(String receiver, String message, boolean sync) {
        if (sync) {
            sendData(receiver, message);
        } else {
            Bukkit.getScheduler().runTaskAsynchronously(Main.getInstance(), () -> sendData(receiver, message));
        }
    }

    private static void sendData(String receiver, String message) {
        if (!use) {
            Logger.log("[Slack] Trying to send (to " + receiver + ") message: " + message);
            Logger.log("[Slack] But functions are disabled..!");
            return;
        }
        if (!receiver.startsWith("#") && !receiver.startsWith("@")) {
            receiver = "#" + receiver;
        }
        final String toReceive = receiver;
        String json = "{\"text\": \"" + message + "\", \"channel\": \"" + toReceive + "\", \"mrkdwn\": true}";
        try {
            URL url = new URL("https://hooks.slack.com/services/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");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            OutputStream os = conn.getOutputStream();
            os.write(json.getBytes(StandardCharsets.UTF_8));
            os.close();
            BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
            br.close();
            conn.disconnect();
        } catch (Exception ignored) {
        }
    }
}