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

import java.util.Date;

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

import com.smartgwt.client.types.Alignment;

import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.IButton;

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

import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.events.CloseClickHandler;
import com.smartgwt.client.widgets.events.CloseClientEvent;
import com.smartgwt.client.widgets.events.ResizedEvent;
import com.smartgwt.client.widgets.events.ResizedHandler;

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

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

/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ChartOutputTab extends OutputTab implements ResizedHandler {

    public static final int DEFAULT_CHART_WIDTH  = 600;
    public static final int DEFAULT_CHART_HEIGHT = 500;

    /** The canvas that wraps the chart toolbar.*/
    protected Canvas tbarPanel;

    /** The canvas that wraps the theme editor.*/
    protected Canvas left;

    /** The canvas that wraps the chart.*/
    protected Canvas right;


    /**
     * The default constructor to create a new ChartOutputTab.
     *
     * @param title The title of this tab.
     * @param collection The Collection which this chart belongs to.
     * @param mode The OutputMode.
     */
    public ChartOutputTab(
        String         title, 
        Collection     collection,
        OutputMode     mode,
        CollectionView collectionView
    ){
        super(title, collection, mode);

        tbarPanel = new Canvas();
        left      = new Canvas();
        right     = new Canvas();

        tbarPanel.setBorder("1px solid black");
        tbarPanel.setHeight(30);
        left.setBorder("1px solid black");
        left.setWidth("25%");
        right.setWidth("*");

        VLayout vLayout = new VLayout();
        vLayout.setMembersMargin(2);

        HLayout hLayout = new HLayout();
        hLayout.setWidth100();
        hLayout.setHeight100();
        hLayout.setMembersMargin(10);

        hLayout.addMember(left);
        hLayout.addMember(right);

        right.addChild(createChartPanel());
        left.addChild(createThemeControlPanel());
        tbarPanel.addChild(
            createTBarPanel(collectionView));

        vLayout.addMember(tbarPanel);
        vLayout.addMember(hLayout);

        setPane(vLayout);

        right.addResizedHandler(this);
    }


    /**
     * This method is called after the chart panel has resized. It removes the
     * chart - if existing - and requests a new one with adjusted size.
     *
     * @param event The resize event.
     */
    public void onResized(ResizedEvent event) {
        Canvas[] children = right.getChildren();
        for (Canvas child: children) {
            right.removeChild(child);
        }

        right.addChild(createChartPanel(right.getWidth(), right.getHeight()));
    }


    protected Canvas createTBarPanel(
        final CollectionView collectionView
    ) {
        HLayout hLayout = new HLayout();
        hLayout.setWidth100();
        hLayout.setHeight100();
        hLayout.setMembersMargin(10);

        Label datacage = new Label("Datenkorb");
        datacage.setHeight(20);
        datacage.setBackgroundColor("#BED730");
        datacage.setBorder("1px solid black");
        datacage.setAlign(Alignment.CENTER);

        hLayout.setMargin(5);
        hLayout.addMember(datacage);
        datacage.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                GWT.log("Clicked 'datacage' button.");
                openDatacageWindow(
                    collectionView.getArtifact());
            }
        });

        return hLayout;
    }

    protected void openDatacageWindow(Artifact artifact) {
        final DatacageWindow dc = new DatacageWindow(artifact);
        dc.addCloseClickHandler(new CloseClickHandler() {
            public void onCloseClick(CloseClientEvent event) {
                dc.destroy();
            }
        });
        dc.show();
    }


    protected Canvas createChartPanel() {
        return createChartPanel(DEFAULT_CHART_WIDTH, DEFAULT_CHART_HEIGHT);
    }


    protected Canvas createChartPanel(int width, int height) {
        Img chart  = getChartImg(width, height);
        chart.setWidth100();
        chart.setHeight100();

        return chart;

    }


    protected Canvas createThemeControlPanel() {
        Label label = new Label("Themensteuerung");
        label.setHeight(25);
        label.setMargin(5);

        return label;
    }


    /**
     * Builds the chart image and returns it.
     *
     * @param width The chart width.
     * @param height The chart height.
     *
     * @return the chart image.
     */
    protected Img getChartImg(int width, int height) {
        return new Img(getImgUrl(width, height));
    }


    /**
     * Builds the URL that points to the chart image.
     *
     * @param width The width of the requested chart.
     * @param height The height of the requested chart.
     *
     * @return the URL to the chart image.
     */
    protected String getImgUrl(int width, int height) {
        Config config = Config.getInstance();

        String imgUrl = GWT.getModuleBaseURL();
        imgUrl += "chart";
        imgUrl += "?uuid=" + collection.identifier();
        imgUrl += "&type=" + mode.getName();
        imgUrl += "&server=" + config.getServerUrl();
        imgUrl += "&locale=" + config.getLocale();
        imgUrl += "&timestamp=" + new Date().getTime();
        imgUrl += "&width=" + Integer.toString(width);
        imgUrl += "&height=" + Integer.toString(height);

        return imgUrl;
    }
}
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