package org.activityinfo.ui.client.component.report.editor.map;

/*
 * #%L
 * ActivityInfo Server
 * %%
 * Copyright (C) 2009 - 2013 UNICEF
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

import com.extjs.gxt.ui.client.event.ButtonEvent;
import com.extjs.gxt.ui.client.event.SelectionListener;
import com.extjs.gxt.ui.client.widget.ContentPanel;
import com.extjs.gxt.ui.client.widget.button.Button;
import com.extjs.gxt.ui.client.widget.layout.HBoxLayout;
import com.extjs.gxt.ui.client.widget.layout.HBoxLayout.HBoxLayoutAlign;
import com.extjs.gxt.ui.client.widget.layout.HBoxLayoutData;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.AbstractImagePrototype;
import com.google.gwt.user.client.ui.HasValue;
import com.google.gwt.user.client.ui.Image;
import org.activityinfo.i18n.shared.I18N;
import org.activityinfo.legacy.client.Dispatcher;
import org.activityinfo.legacy.shared.command.GetBaseMaps;
import org.activityinfo.legacy.shared.command.result.BaseMapResult;
import org.activityinfo.legacy.shared.model.TileBaseMap;
import org.activityinfo.legacy.shared.reports.content.GoogleBaseMap;
import org.activityinfo.legacy.shared.reports.model.MapReportElement;
import org.activityinfo.ui.client.component.report.editor.map.mapOptions.BaseMapDialog;
import org.activityinfo.ui.client.component.report.editor.map.mapOptions.BaseMapDialog.Callback;

/**
 * Displays the current basemap id with a button to change it.
 */
public class BaseMapPanel extends ContentPanel implements HasValue<String> {

    private final Dispatcher dispatcher;
    private String value;
    private LabelWithText label;

    public BaseMapPanel(Dispatcher dispatcher) {
        this.dispatcher = dispatcher;

        setCollapsible(false);
        setFrame(true);
        setHeadingText(I18N.CONSTANTS.basemap());
        setBodyBorder(false);
        setIcon(AbstractImagePrototype.create(MapResources.INSTANCE.layers()));

        HBoxLayout layout = new HBoxLayout();
        layout.setHBoxLayoutAlign(HBoxLayoutAlign.MIDDLE);

        setLayout(layout);

        Image icon = new Image(MapResources.INSTANCE.globe());
        label = new LabelWithText();
        Button button = new Button("Change", new SelectionListener<ButtonEvent>() {

            @Override
            public void componentSelected(ButtonEvent ce) {
                chooseBaseMap();
            }
        });

        HBoxLayoutData iconLayout = new HBoxLayoutData(0, 5, 0, 2);
        add(icon, iconLayout);

        HBoxLayoutData labelLayout = new HBoxLayoutData(0, 0, 0, 5);
        labelLayout.setFlex(1);
        add(label, labelLayout);

        add(button);

        label.setHtml(I18N.CONSTANTS.loading());
    }

    private void chooseBaseMap() {
        BaseMapDialog dialog = new BaseMapDialog(dispatcher);
        dialog.show(value, new Callback() {

            @Override
            public void onSelect(String baseMapId, String label) {
                BaseMapPanel.this.value = baseMapId;
                BaseMapPanel.this.label.setText(label);

                ValueChangeEvent.fire(BaseMapPanel.this, value);
            }
        });
    }

    @Override
    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) {
        return addHandler(handler, ValueChangeEvent.getType());
    }

    /**
     * Gets the BaseMap id
     */
    @Override
    public String getValue() {
        return value;
    }

    /**
     * Sets the BaseMap id
     */
    @Override
    public void setValue(String value) {
        setValue(value, false);
    }

    @Override
    public void setValue(String value, boolean fireEvents) {
        this.value = value;
        if (MapReportElement.AUTO_BASEMAP.equals(value) || value == null) {
            label.setText("Default");
        } else if (GoogleBaseMap.HYBRID.getId().equals(value)) {
            label.setText(I18N.CONSTANTS.googleHybrid());
        } else if (GoogleBaseMap.ROADMAP.getId().equals(value)) {
            label.setText(I18N.CONSTANTS.googleRoadmap());
        } else if (GoogleBaseMap.SATELLITE.getId().equals(value)) {
            label.setText(I18N.CONSTANTS.googleSatelliteMap());
        } else if (GoogleBaseMap.TERRAIN.getId().equals(value)) {
            label.setText(I18N.CONSTANTS.googleTerrainMap());
        } else {
            loadTileMapLabel();
        }
    }

    private void loadTileMapLabel() {

        label.setText(I18N.CONSTANTS.loading());
        dispatcher.execute(new GetBaseMaps(), new AsyncCallback<BaseMapResult>() {

            @Override
            public void onFailure(Throwable caught) {
                label.setText(value);
            }

            @Override
            public void onSuccess(BaseMapResult result) {
                for (TileBaseMap baseMap : result.getBaseMaps()) {
                    if (baseMap.getId().equals(value)) {
                        label.setText(baseMap.getName());
                        return;
                    }
                }
                label.setText(value);
            }
        });
    }
}