/**
 * Copyright 2015 ArcBees Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.arcbees.gaestudio.client.application.visualizer.widget;

import com.arcbees.gaestudio.client.application.channel.ChannelHandler;
import com.arcbees.gaestudio.client.application.widget.ajax.LoadingEvent;
import com.arcbees.gaestudio.client.rest.ImportService;
import com.arcbees.gaestudio.client.util.AsyncCallbackImpl;
import com.arcbees.gaestudio.shared.dto.ObjectWrapper;
import com.google.inject.Inject;
import com.google.web.bindery.event.shared.EventBus;
import com.gwtplatform.dispatch.rest.client.RestDispatchAsync;
import com.gwtplatform.mvp.client.PopupView;
import com.gwtplatform.mvp.client.PresenterWidget;

public class ImportPresenter extends PresenterWidget<ImportPresenter.MyView> implements UploadForm.Handler {
    interface MyView extends PopupView {
        void hide();

        void setUploadWidget(UploadForm uploadWidget);

        void onFileChosen(String chosenFileName);

        void prepareForNewUpload();
    }

    private final RestDispatchAsync restDispatch;
    private final ImportService importService;
    private final UploadFormFactory uploadFormFactory;
    private final ChannelHandler channelHandler;

    @Inject
    ImportPresenter(
            EventBus eventBus,
            MyView view,
            RestDispatchAsync restDispatch,
            ImportService importService,
            UploadFormFactory uploadFormFactory,
            ChannelHandler channelHandler) {
        super(eventBus, view);

        this.restDispatch = restDispatch;
        this.importService = importService;
        this.uploadFormFactory = uploadFormFactory;
        this.channelHandler = channelHandler;

        getUploadUrl();
    }

    @Override
    public void onUploadSuccess() {
        getView().hide();
    }

    @Override
    public void onSubmit() {
        LoadingEvent.fire(this, LoadingEvent.Action.BEGIN);
    }

    @Override
    public void onFileChosen(final String chosenFileName) {
        channelHandler.openChannel(new ChannelHandler.ChannelOpenCallback() {
            @Override
            public void onChannelOpen() {
                getView().onFileChosen(chosenFileName);
            }
        });
    }

    @Override
    public void onUploadFailure(String errorMessage) {
        getView().prepareForNewUpload();
        getUploadUrl();
    }

    private void getUploadUrl() {
        restDispatch.execute(importService.getUploadUrl(), new AsyncCallbackImpl<ObjectWrapper<String>>() {
            @Override
            public void onSuccess(ObjectWrapper<String> result) {
                getView().setUploadWidget(uploadFormFactory.createForm(result.getValue(), ImportPresenter.this));
            }
        });
    }
}