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package cn.mapway.ui.client.mqtt;

import com.google.gwt.core.client.Callback;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.ScriptInjector;


/**
 * 操作MQTT.
 *
 * @author zhangjianshe
 */
public class MqttJs {

    /**
     * The loaded.
     */
    private static boolean loaded = false;

    /**
     * 是否加载类库成功.
     *
     * @return true, if is loaded
     */
    public static final boolean isLoaded() {
        return loaded;
    }

    /**
     * 创建MQTT客户端.
     *
     * @param host the host
     * @param port the port
     * @param id   the id
     * @param path the path
     * @return the mqtt js client
     */
    public static final MqttJsClient createClient(String host, int port, String id, String path) {
        if (isLoaded()) {
            return MqttJsClient.create(host, port, id, path);
        } else {
            return null;
        }
    }

    /**
     * 初始化ECHART 类库.
     *
     * @param handler the handler
     */
    public static void load(final Callback handler) {
        String url = GWT.getModuleBaseURL() + "../js/mqtt.js";
        ScriptInjector.fromUrl(url).setCallback(new Callback() {
            @Override
            public void onSuccess(Void result) {
                MqttJs.loaded = true;
                if (handler != null) {
                    handler.onSuccess(null);
                }
            }

            @Override
            public void onFailure(Exception reason) {
                MqttJs.loaded = false;
                if (handler != null) {
                    handler.onFailure(reason);
                }
            }
        }).inject();
    }


}