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

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

import com.smartgwt.client.widgets.Button;

import com.smartgwt.client.widgets.layout.VLayout;
import com.smartgwt.client.widgets.layout.HLayout;

import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.events.ClickEvent;

import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridRecord;

import de.intevation.flys.client.shared.model.Artifact;
import de.intevation.flys.client.shared.model.User;
import de.intevation.flys.client.shared.model.ToLoad;

import de.intevation.flys.client.client.FLYSConstants;

import de.intevation.flys.client.shared.model.Recommendation;


/**
 * Widget showing two Datacages and a plus-button.
 * Insert a record into a listgrid when plus-button clicked.
 */
public class DatacagePairWidget
extends      VLayout
{
    protected FLYSConstants messages =
        GWT.create(FLYSConstants.class);

    /** The "remote" ListGrid to insert data to when add-button is clicked. */
    protected ListGrid grid; 

    /** First attribute-name for StringPairRecord. */
    protected static final String ATTRIBUTE_FIRST  = "first";

    /** Second attribute-name for StringPairRecord. */
    protected static final String ATTRIBUTE_SECOND = "second";

    /** First (upper) DataCage Grid. */
    protected DatacageWidget firstDatacageWidget;

    /** Second (lower) DataCage Grid. */
    protected DatacageWidget secondDatacageWidget;


    /**
     * Two strings to be displayed in a GridList.
     */
    protected class RecommendationPairRecord extends ListGridRecord {
        Recommendation first;
        Recommendation second;

        public RecommendationPairRecord() {
        }

        public RecommendationPairRecord(Recommendation first, Recommendation second) {
            setFirst(first);
            setSecond(second);
        }


        public void setFirst(Recommendation first) {
            this.first = first;
            setAttribute(ATTRIBUTE_FIRST, first.getFactory() + first.getIDs());
        }


        public void setSecond(Recommendation second) {
            this.second = second;
            setAttribute(ATTRIBUTE_SECOND, second.getFactory() + second.getIDs());
        }

        public Recommendation getFirst() {return first;}
        public Recommendation getSecond() {return second;}
    }


    /**
     *
     * @param artifact Artifact to query datacage with.
     * @param user     User to query datacage with.
     * @param outs     outs to query datacage with.
     * @param grid     Grid into which to insert selection of pairs.
     */
    public DatacagePairWidget(Artifact artifact, User user, String outs,
            ListGrid grid) {
        this.grid = grid;

        HLayout hLayout = new HLayout();

        firstDatacageWidget = new DatacageWidget(artifact, user, outs, false);
        hLayout.addMember(firstDatacageWidget);
        secondDatacageWidget = new DatacageWidget(artifact, user, outs, false);
        hLayout.addMember(secondDatacageWidget);

        // TODO: i18n + icon
        Button plusBtn = new Button("+");
        plusBtn.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                plusClicked();
            }
        });

        addMember(hLayout);
        addMember(plusBtn);
    }


    /**
     * Callback for add-button.
     * Fires to load for every selected element and handler.
     */
    public void plusClicked() {
        ToLoad toLoad1 = firstDatacageWidget.getSelection();
        ToLoad toLoad2 = secondDatacageWidget.getSelection();

        // TODO further sanitize (toRecommendations.length)
        if (toLoad1 == null || toLoad2 == null) {
            return;
        }

        grid.addData(new RecommendationPairRecord(
            toLoad1.toRecommendations().get(0),
            toLoad2.toRecommendations().get(0)));
    }
}
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