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

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

import com.google.gwt.core.client.GWT;
import com.google.gwt.i18n.client.DateTimeFormat;

import com.smartgwt.client.types.ListGridFieldType;

import com.smartgwt.client.data.Record;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.DateRangeItem;
import com.smartgwt.client.widgets.Label;

import com.smartgwt.client.widgets.layout.VLayout;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridField;
import com.smartgwt.client.widgets.grid.CellFormatter;
import com.smartgwt.client.widgets.grid.ListGridRecord;
import com.smartgwt.client.widgets.grid.events.RecordClickHandler;
import com.smartgwt.client.widgets.grid.events.RecordClickEvent;

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

import de.intevation.flys.client.shared.model.DataList;
import de.intevation.flys.client.shared.model.DataItem;
import de.intevation.flys.client.shared.model.ArtifactDescription;
import de.intevation.flys.client.shared.model.Data;
import de.intevation.flys.client.shared.model.RangeData;
import de.intevation.flys.client.shared.model.LongRangeData;

import de.intevation.flys.client.client.ui.range.DischargeInfoDataSource;

/**
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class GaugeTimeRangePanel extends RangePanel {

    /** The message class that provides i18n strings. */
    protected FLYSConstants MESSAGES = GWT.create(FLYSConstants.class);

    protected ListGrid yearTable;

    protected DateRangeItem dateRange;

    public GaugeTimeRangePanel() {
        GWT.log("Creating YearInputPanel");
        yearTable = new ListGrid();
        yearTable.setAutoFetchData(true);
        yearTable.setShowHeaderContextMenu(false);

    }

    public Canvas create(DataList data) {
        setDataName(data);

        VLayout root = new VLayout();

        root.addMember(createLabel(data));
        root.addMember(createForm(data));
        root.addMember(getNextButton());

        initDefaults(data);


        initYearTable();

        long gauge = getGaugeNumber();

        Config config = Config.getInstance();
        String url = config.getServerUrl();
        yearTable.setDataSource(new DischargeInfoDataSource(url, gauge));

        helperContainer.addMember(yearTable);
        return root;
    }


    @Override
    protected void initDefaults(DataList dataList) {
        RangeData data = findRangeData(dataList);

        if(data != null) {
            GWT.log("data: " + data);
        }
    }


    @Override
    public Canvas createOld(DataList dataList) {
        GWT.log("create old date.");
        Data       data  = dataList.get(0);
        DataItem[] items = data.getItems();
GWT.log(data.getClass().toString());
        HLayout layout = new HLayout();

        Label label = new Label(dataList.getLabel());
        label.setWidth(200);
        label.setHeight(20);

        Date dl = new Date((Long)((LongRangeData)data).getLower());
        Date du = new Date((Long)((LongRangeData)data).getUpper());
        DateTimeFormat dtf = DateTimeFormat.getMediumDateFormat();
        Label value = new Label(dtf.format(dl) + " - " + dtf.format(du));
        value.setHeight(20);

        layout.addMember(label);
        layout.addMember(value);
        layout.addMember(getBackButton(dataList.getState()));

        return layout;
    }


    @Override
    protected Data[] getData() {
        long lo = getLowerAsLong();
        long up = getUpperAsLong();

        return new Data[] { new LongRangeData(getDataName(), null, lo, up) };
    }


    @Override
    protected Canvas createForm(DataList dataList) {
        HLayout layout = new HLayout();
        DynamicForm form = new DynamicForm();
        dateRange = new DateRangeItem();
        dateRange.setToTitle(MESSAGES.to());
        dateRange.setFromTitle(MESSAGES.from());
        dateRange.setShowTitle(false);
        form.setFields(dateRange);

        layout.addMember(form);
        return layout;

    }


    @Override
    public Object getMaxLower() {
        Date d = dateRange.getFromDate();
        return new Long(d.getTime());
    }


    protected long getLowerAsLong() {
        Date d = dateRange.getFromDate();
        return d.getTime();
    }


    protected long getUpperAsLong() {
        Date d = dateRange.getToDate();
        return d.getTime();
    }


    @Override
    public Object getMaxUpper() {
        Date d = dateRange.getToDate();
        return new Long(d.getTime());
    }


    @Override
    public void setLower(String lower) {
        try {
            DateTimeFormat dtf =
                DateTimeFormat.getFormat("yyyy");
            Date dy = dtf.parse(lower);
            dy.setMonth(0);
            dy.setDate(1);
            dateRange.setFromDate(dy);
        }
        catch(IllegalArgumentException iae) {
            GWT.log("could not parse lower date.");
            //TODO: Messagebox with error.
        }
    }


    @Override
    public void setUpper(String upper) {
        try {
            DateTimeFormat dtf =
                DateTimeFormat.getFormat("yyyy");
            Date dy = dtf.parse(upper);
            dy.setMonth(0);
            dy.setDate(1);
            dateRange.setToDate(dy);
        }
        catch(IllegalArgumentException iae) {
            GWT.log("could not parse upper date.");
            //TODO: Messagebox with error.
        }
    }


    protected ListGrid initYearTable() {
        String baseUrl = GWT.getHostPageBaseURL();

        yearTable.setWidth100();
        yearTable.setHeight100();
        yearTable.setShowRecordComponents(true);
        yearTable.setShowRecordComponentsByCell(true);
        yearTable.setEmptyMessage(MESSAGES.empty_filter());
        yearTable.setCanReorderFields(false);

        CellFormatter cf = new CellFormatter() {
            public String format(
                Object value,
                ListGridRecord record,
                int rowNum, int colNum) {
                    if (value == null) return null;
                    if (value.toString().equals("-1")) {
                        return "";
                    }
                    return value.toString();
            }
        };


        ListGridField addstart = new ListGridField ("", "");
        addstart.setType (ListGridFieldType.ICON);
        addstart.setWidth (20);
        addstart.setCellIcon(baseUrl + MESSAGES.markerGreen());
        addstart.addRecordClickHandler(new RecordClickHandler() {
            public void onRecordClick(RecordClickEvent e) {
                Record r = e.getRecord();
                if (r.getAttribute("start").equals("-1")) {
                    return;
                }
                else {
                    setLower(r.getAttribute("start"));
                }
            }
        });

        ListGridField addend = new ListGridField ("", "");
        addend.setType (ListGridFieldType.ICON);
        addend.setWidth (20);
        addend.setCellIcon(baseUrl + MESSAGES.markerRed());
        addend.addRecordClickHandler(new RecordClickHandler() {
            public void onRecordClick(RecordClickEvent e) {
                Record r = e.getRecord();
                if (r.getAttribute("end").equals("-1")) {
                    return;
                }
                else {
                    setUpper(r.getAttribute("end"));
                }
            }
        });

        ListGridField desc =
            new ListGridField("description", MESSAGES.description());
        desc.setType(ListGridFieldType.TEXT);
        desc.setWidth("*");

        ListGridField start =
            new ListGridField("start", MESSAGES.start_year());
        start.setType(ListGridFieldType.INTEGER);
        start.setWidth(50);
        start.setCellFormatter(cf);

        ListGridField end =
            new ListGridField("end", MESSAGES.end_year());
        end.setType(ListGridFieldType.INTEGER);
        end.setWidth(50);
        end.setCellFormatter(cf);

        yearTable.setFields(addstart, addend, desc, start, end);

        return yearTable;
    }


    protected long getGaugeNumber() {
        ArtifactDescription adescr = artifact.getArtifactDescription();
        DataList[] data = adescr.getOldData();

        String gauge = "";
        if (data != null && data.length > 0) {
            for (int i = 0; i < data.length; i++) {
                DataList dl = data[i];
                if (dl.getState().equals("state.winfo.historicalq.reference_gauge")) {
                    for (int j = 0; j < dl.size(); j++) {
                        Data d = dl.get(j);
                        DataItem[] di = d.getItems();
                        if (di != null && di.length == 1) {
                           gauge = d.getItems()[0].getStringValue();
                        }
                    }
                }
            }
        }
        try {
            return Long.parseLong(gauge);
        }
        catch (NumberFormatException nfe) {
            GWT.log("Error parsing gauge.");
            return 0;
        }
    }


    @Override
    public List<String> validate() {
        List<String> errors = new ArrayList<String>();
        if (dateRange.getFromDate() == null ||
            dateRange.getToDate() == null ||
            !dateRange.getFromDate().before(dateRange.getToDate()))
        {
            String msg = MSG.error_validate_date_range();
            errors.add(msg);
        }
        return errors;
    }
}