package de.intevation.flys.client.client.ui.chart;

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

import com.smartgwt.client.types.Alignment; 
import com.smartgwt.client.widgets.Canvas;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.smartgwt.client.types.ListGridFieldType;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridField;
import com.smartgwt.client.widgets.grid.ListGridRecord;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.form.fields.SpinnerItem;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.events.ChangedEvent;
import com.smartgwt.client.widgets.form.fields.events.ChangedHandler;

import de.intevation.flys.client.client.Config;
import de.intevation.flys.client.shared.model.Artifact;
import de.intevation.flys.client.shared.model.Collection;
import de.intevation.flys.client.shared.model.OutputMode;

import de.intevation.flys.client.shared.model.Data;
import de.intevation.flys.client.shared.model.DataItem;
import de.intevation.flys.client.shared.model.DefaultArtifact;
import de.intevation.flys.client.shared.model.DefaultData;
import de.intevation.flys.client.shared.model.DefaultDataItem;
import de.intevation.flys.client.shared.model.FacetRecord;

import de.intevation.flys.client.client.services.FeedServiceAsync;


/**
 * ThemePanel much like ChartThemePanel, but shows an "Actions" column,
 * needed for interaction in the CrossSection Charts.
 */
public class CrossSectionChartThemePanel
extends      ChartThemePanel {

    /**
     * Trivial constructor.
     */
    public CrossSectionChartThemePanel(
            Collection collection,
            OutputMode mode)
    {
        super(collection, mode);
    }


    /**
     * Create the handler for ChangeEvents on the Spinner in the
     * facets that control km of cross section.
     *
     * @param feedService The FeedService to send (changed) data to.
     * @param facetRecord The FacetRecord (~row in table) where this
     *                    handler is added to (to a child, to be exact).
     */
    public final ChangedHandler createSpinnerHandler(
        final FeedServiceAsync feedService,
        final FacetRecord      facetRecord)
    {
        Config config          = Config.getInstance();
        final String locale    = config.getLocale();

        ChangedHandler handler = new ChangedHandler()
            {
                @Override
                public void onChanged(ChangedEvent ce) {
                    if (ce.getValue() == null) {
                        return;
                    }
                    DefaultDataItem kmItem = new DefaultDataItem(
                        "cross_section.km",
                        "cross_section.km",
                        ce.getValue().toString());
                    DefaultData km = new DefaultData(
                        "cross_section.km",
                        null,
                        null,
                        new DataItem[] {kmItem});
                    Data[] feedData = new Data[] {km};
                    feedService.feed(
                        locale,
                        new DefaultArtifact(
                            facetRecord.getTheme().getArtifact(),
                            "TODO:hash"),
                        feedData,
                        new AsyncCallback<Artifact>() {
                            public void onFailure(Throwable caught) {
                                GWT.log("Could not feed artifact " + caught.getMessage());
                                // TODO SC.warn 
                            }
                            public void onSuccess(Artifact artifact) {
                                GWT.log("Successfully fed");
                                // TODO: Also update content of spinnerbox
                                requestRedraw();
                            }
                    });
                }
            };
        return handler;
    }


    /**
     * Create and configure the Grid to display.
     */
    @Override
    protected ListGrid createGrid() {
        ListGrid list = new ListGrid() {
            @Override
            protected Canvas createRecordComponent(
                final ListGridRecord record,
                Integer colNum)
            {
                    // Only cross_section Facets display an action widget.
                    final FacetRecord facetRecord = (FacetRecord) record;
                    if (!facetRecord.getTheme().getFacet().equals(
                        "cross_section"))
                    {
                        return null;
                    }

                    String fieldName = this.getFieldName(colNum);

                    if (fieldName.equals(GRID_FIELD_ACTIONS)) {
                        HLayout recordCanvas = new HLayout(3);
                        recordCanvas.setHeight(22);
                        recordCanvas.setAlign(Alignment.CENTER);
                        // TODO Refactor in createSpinner(data, artifact)
                        SpinnerItem spinnerItem = new SpinnerItem();
                        spinnerItem.setShowTitle(false);
                        spinnerItem.setTitle("Waterlevel-Spinner");
                        spinnerItem.setWidth(45);
                        // TODO actually get the value from artifact
                        // TODO actually get the range from artifact (or river?)
                        spinnerItem.setDefaultValue(0);
                        spinnerItem.setMin(0);
                        spinnerItem.setMax(1000);
                        spinnerItem.setStep(5f);
                        spinnerItem.setChangeOnKeypress(true);

                        spinnerItem.addChangedHandler(
                            createSpinnerHandler(
                                feedService,
                                facetRecord));

                        DynamicForm formWrap = new DynamicForm();
                        formWrap.setFields(spinnerItem);
                        formWrap.setTitlePrefix("");
                        formWrap.setTitleSuffix("");
                        recordCanvas.addMember(formWrap);
                        return recordCanvas;
                    }
                    else {
                        return null;
                    }
                }
            };
        list.setCanResizeFields(true);
        list.setShowRecordComponents(true);
        list.setShowRecordComponentsByCell(true);
        list.setShowAllRecords(true);
        list.setShowHeaderContextMenu(false);
        return list;
    }


    /**
     * Initializes the components (columns) of the theme grid.
     */
    @Override
    protected void initGrid() {
        list.setCanEdit(true);
        list.setCanSort(false);
        list.setShowRecordComponents(true);
        list.setShowRecordComponentsByCell(true);
        list.setShowHeader(true);
        //list.setShowHeaderContextMenu(false);
        list.setWidth100();
        list.setHeight100();

        list.addEditCompleteHandler(this);

        ListGridField active = new ListGridField(GRID_FIELD_ACTIVE, " ", 20);
        active.setType(ListGridFieldType.BOOLEAN);

        ListGridField name = new ListGridField(
            GRID_FIELD_NAME, MSG.chart_themepanel_header_themes());
        name.setType(ListGridFieldType.TEXT);

        ListGridField actions = new ListGridField(GRID_FIELD_ACTIONS,
             MSG.chart_themepanel_header_actions(), 50);

        list.setFields(active, name, actions);
    }
}
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