/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details.
 */

package org.dive4elements.river.client.client.ui.sinfo;

import java.util.ArrayList;
import java.util.List;

import org.dive4elements.river.client.client.FLYSConstants;
import org.dive4elements.river.client.client.ui.AbstractUIProvider;
import org.dive4elements.river.client.client.ui.FromToTableHelperPanel;
import org.dive4elements.river.client.client.ui.FromToTableHelperPanel.IColumnClickHandler;
import org.dive4elements.river.client.shared.model.Data;
import org.dive4elements.river.client.shared.model.DataItem;
import org.dive4elements.river.client.shared.model.DataList;
import org.dive4elements.river.client.shared.model.DefaultData;
import org.dive4elements.river.client.shared.model.DefaultDataItem;

import com.google.gwt.core.client.GWT;
import com.google.gwt.i18n.client.NumberFormat;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.TextItem;
import com.smartgwt.client.widgets.form.validator.IsIntegerValidator;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

public class CollisionLoadYearPanel extends AbstractUIProvider {

    private final FLYSConstants MESSAGES = GWT.create(FLYSConstants.class);

    private TextItem yearsItem;

    private List<String> validYears = new ArrayList<String>();

    private ListGrid table;

    public CollisionLoadYearPanel() {
    }

    @Override
    public Canvas createOld(final DataList dataList) {
        final List<Data> items = dataList.getAll();
        final Data years = getData(items, "years");
        final DataItem[] yearsItems = years.getItems();

        final String v1 = yearsItems[0].getStringValue().replace(" ", ", ");

        final Label old = new Label(v1);
        final HLayout layout = new HLayout();
        layout.setWidth("400px");

        final Label label = new Label(dataList.getLabel());
        label.setWidth("200px");

        final Canvas back = getBackButton(dataList.getState());

        layout.addMember(label);
        layout.addMember(old);
        layout.addMember(back);

        return layout;
    }

    @Override
    public List<String> validate() {
        return validateYears();
    }

    @Override
    public Canvas create(final DataList data) {
        final VLayout layout = new VLayout();
        final IColumnClickHandler fromHandler = new IColumnClickHandler() { // add to external class

            @Override
            public void columnClicked(final String value) {
                appendYear(value);
            }
        };

        final FromToTableHelperPanel helper = new FromToTableHelperPanel(data, "years", this.MSG, fromHandler, null);
        final Canvas table = helper.getTable();
        this.validYears = helper.getKeycolEntries();

        this.helperContainer.addMember(table);

        final Canvas submit = getNextButton();
        final Canvas widget = createWidget(data);

        layout.addMember(widget);
        layout.addMember(submit);

        return layout;
    }

    public Canvas createWidget(final DataList data) {
        final VLayout layout = new VLayout();

        final Label title = new Label(data.get(0).getDescription());
        title.setHeight("25px");

        final DynamicForm form = new DynamicForm();
        form.setNumCols(4);
        this.yearsItem = new TextItem(this.MSG.years());
        this.yearsItem.setValidators(new IsIntegerValidator());
        form.setFields(this.yearsItem); // TODO: move to helper

        layout.addMember(title);
        layout.addMember(form);

        return layout;
    }

    @Override
    protected Data[] getData() {
        validateYears();
        if (this.yearsItem != null && !this.yearsItem.getValueAsString().isEmpty()) {
            final List<Data> data = new ArrayList<Data>();

            final DataItem yearsdata = new DefaultDataItem("years", "years", this.yearsItem.getValueAsString().trim());
            data.add(new DefaultData("years", null, null, new DataItem[] { yearsdata }));

            return data.toArray(new Data[data.size()]);
        }
        return new Data[0];
    }

    private List<String> validateYears() {
        final List<String> errors = new ArrayList<String>();
        final NumberFormat nf = NumberFormat.getDecimalFormat();

        if (this.yearsItem.getValueAsString() == null || this.yearsItem.getValueAsString().trim().isEmpty()) {
            errors.add(this.MESSAGES.empty_filter());
            return errors;
        }

        final String[] sValues = this.yearsItem.getValueAsString().trim().split(" ");
        String filtered = "";
        int goodValues = 0;
        for (final String sValue : sValues) {
            int value;
            try {
                value = Integer.parseInt(sValue);
            }
            catch (final NumberFormatException e) {
                errors.add(this.MESSAGES.wrongFormat() + ": " + sValue);
                continue;
            }
            boolean isGood = false;
            for (final String validYear : this.validYears) {
                /* No list contains for strings? */
                if (sValue.equals(validYear)) {
                    isGood = true;
                    break;
                }
            }
            if (!isGood) {
                String tmp = this.MESSAGES.no_data_for_year();
                tmp = tmp.replace("$1", sValue);
                errors.add(tmp);
                continue;
            }
            goodValues++;
            if (goodValues > 1) {
                filtered += " " + Integer.toString(value);
            } else {
                filtered = Integer.toString(value);
            }
        }

        return errors;
    }

    protected final void appendYear(final String year) {
        final String oldYears = this.yearsItem.getValueAsString();
        if (oldYears != null && !oldYears.isEmpty()) {
            this.yearsItem.setValue(oldYears.trim() + " " + year);
        } else {
            this.yearsItem.setValue(year);
        }
    }
}