/* 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.uinfo;

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

import org.dive4elements.river.client.client.Config;
import org.dive4elements.river.client.client.FLYSConstants;
import org.dive4elements.river.client.client.services.SedimentLoadInfoService;
import org.dive4elements.river.client.client.services.SedimentLoadInfoServiceAsync;
import org.dive4elements.river.client.client.ui.AbstractUIProvider;
import org.dive4elements.river.client.shared.model.ArtifactDescription;
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 org.dive4elements.river.client.shared.model.SedimentLoadInfoObject;
import org.dive4elements.river.client.shared.model.SedimentLoadInfoRecord;

import com.google.gwt.core.client.GWT;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.smartgwt.client.data.Record;
import com.smartgwt.client.types.ListGridFieldType;
import com.smartgwt.client.util.SC;
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.IntegerItem;
import com.smartgwt.client.widgets.form.fields.TextItem;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridField;
import com.smartgwt.client.widgets.grid.events.RecordClickEvent;
import com.smartgwt.client.widgets.grid.events.RecordClickHandler;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

public class LoadSingleYearPanel extends AbstractUIProvider {
    protected SedimentLoadInfoServiceAsync sedLoadInfoService = GWT.create(SedimentLoadInfoService.class); // TODO: find right datasource

    private static final String datakey = "singleyear";
    protected FLYSConstants MESSAGES = GWT.create(FLYSConstants.class);

    private TextItem inputItem;

    private ListGrid sedLoadTable;

    protected List<String> validInputs;

    public LoadSingleYearPanel() {
    }

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

        final String v1 = alreadySetItems[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 Canvas helper = createHelper();
        this.helperContainer.addMember(helper);

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

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

        fetchSedimentLoadData();

        return layout;
    }

    private Canvas createHelper() {
        this.sedLoadTable = new ListGrid();
        this.sedLoadTable.setShowHeaderContextMenu(false);
        this.sedLoadTable.setWidth100();
        this.sedLoadTable.setShowRecordComponents(true);
        this.sedLoadTable.setShowRecordComponentsByCell(true);
        this.sedLoadTable.setHeight100();
        this.sedLoadTable.setEmptyMessage(this.MSG.empty_table());
        this.sedLoadTable.setCanReorderFields(false);

        final ListGridField date = new ListGridField("date", this.MSG.year());
        date.setType(ListGridFieldType.TEXT);
        date.setWidth(100);

        final ListGridField descr = new ListGridField("description", this.MSG.description());
        descr.setType(ListGridFieldType.TEXT);
        descr.setWidth("*");

        final String baseUrl = GWT.getHostPageBaseURL();
        final ListGridField pinFrom = new ListGridField("fromIcon", this.MESSAGES.selection());
        pinFrom.setWidth(60);
        pinFrom.setType(ListGridFieldType.ICON);
        pinFrom.setCellIcon(baseUrl + this.MESSAGES.markerGreen());

        pinFrom.addRecordClickHandler(new RecordClickHandler() {
            @Override
            public void onRecordClick(final RecordClickEvent e) {
                final Record r = e.getRecord();
                appendValue(r.getAttribute("date"));
            }
        });

        this.sedLoadTable.setFields(pinFrom, date, descr);
        return this.sedLoadTable;
    }

    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.inputItem = new IntegerItem(this.MSG.year());
        this.inputItem.setShowTitle(false);
        form.setFields(this.inputItem);

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

        return layout;
    }

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

            final DataItem yearsdata = new DefaultDataItem(datakey, datakey, this.inputItem.getValueAsString().trim()); // DATA-STRING: years (in
                                                                                                                        // uinfo.xml)
            data.add(new DefaultData(datakey, null, null, new DataItem[] { yearsdata }));

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

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

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

        final String sValue = this.inputItem.getValueAsString();// .trim().split(" ");
        String filtered = "";
        int goodValues = 0;

        int value = 0;
        try {
            value = Integer.parseInt(sValue);
        }
        catch (final NumberFormatException e) {
            errors.add(this.MESSAGES.wrongFormat() + ": " + sValue);

        }
        boolean isGood = false;
        for (final String validYear : this.validInputs) {
            /* 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 void fetchSedimentLoadData() {
        final Config config = Config.getInstance();
        final String locale = config.getLocale();

        final ArtifactDescription adescr = this.artifact.getArtifactDescription();
        final DataList[] data = adescr.getOldData();

        final double[] km = this.artifact.getArtifactDescription().getKMRange();
        final String river = this.artifact.getArtifactDescription().getRiver();

        String sq_ti_id = "";
        this.validInputs = new ArrayList<String>(data.length);
        for (final DataList element : data) {
            final Data str = getData(element.getAll(), "sq_ti_id");
            if (str != null) {
                final DataItem[] strItems = str.getItems();
                sq_ti_id = strItems[0].getStringValue();
                break;
            }
        }

        if (sq_ti_id.isEmpty()) {
            GWT.log("Failed to find sq time interval id in data.");
        }

        this.sedLoadInfoService.getSedimentLoadInfo(locale, river, "single", km[0], km[1], sq_ti_id, new AsyncCallback<SedimentLoadInfoObject[]>() {
            @Override
            public void onFailure(final Throwable caught) {
                GWT.log("Could not recieve sediment load informations.");
                SC.warn(LoadSingleYearPanel.this.MSG.getString(caught.getMessage()));
            }

            @Override
            public void onSuccess(final SedimentLoadInfoObject[] sedLoad) {
                final int num = sedLoad != null ? sedLoad.length : 0;
                GWT.log("Recieved " + num + " sediment load informations.");

                if (num == 0) {
                    return;
                }

                addSedimentLoadInfo(sedLoad);
            }
        });
    }

    protected void addSedimentLoadInfo(final SedimentLoadInfoObject[] sedLoad) {
        for (final SedimentLoadInfoObject sl : sedLoad) {
            final SedimentLoadInfoRecord rec = new SedimentLoadInfoRecord(sl);
            this.sedLoadTable.addData(rec);
            this.validInputs.add(rec.getDate());
        }
    }

    protected void appendValue(final String year) { // SINGLE-Input
        final String oldYears = this.inputItem.getValueAsString();
        this.inputItem.setValue(year);
    }
}