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

import java.io.Serializable;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.ClickListener;

import com.smartgwt.client.widgets.Label;

import de.intevation.flys.client.client.FLYSConstants;
import de.intevation.flys.client.shared.model.DataItem;
import de.intevation.flys.client.shared.model.IntegerOptionsData;
import de.intevation.flys.client.shared.model.StringOptionsData;


public class ParameterMatrix {

    public static class Column implements Serializable {
        protected String              name;
        protected Map<String, String> values;

        private Column() {
            this.values = new HashMap<String, String>();
        }

        public Column(String name) {
            this();
            this.name = name;
        }

        public void addValue(String label, String value) {
            values.put(label, value);
        }

        public String getValue(String label) {
            return values.get(label);
        }
    } // end of class Column

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

    public static final int CELL_HEIGHT = 25;

    private Map<String, Column> columns;
    private List<String>        columnNames;
    private List<String>        valueNames;

    private Map<String, List<String>> selected;

    public ParameterMatrix() {
        super();
        this.columns     = new HashMap<String, Column>();
        this.columnNames = new ArrayList<String>();
        this.valueNames  = new ArrayList<String>();
        this.selected    = new HashMap<String, List<String>>();
    }


    public void addColumn(IntegerOptionsData group) {
        String groupTitle = group.getLabel();

        Column     col   = new Column(groupTitle);
        DataItem[] items = group.getItems();

        if (items == null) {
            GWT.log("No items found in StringOptionsData '" + groupTitle + "'");
            return;
        }

        for (DataItem item: items) {
            String title = item.getLabel();

            if (valueNames.indexOf(title) < 0) {
                valueNames.add(title);
            }

            col.addValue(item.getLabel(), item.getStringValue());
        }

        columnNames.add(groupTitle);
        columns.put(groupTitle, col);
    }


    public void addColumn(StringOptionsData options) {
        String groupTitle = options.getLabel();

        Column     col   = new Column(groupTitle);
        DataItem[] items = options.getItems();

        if (items == null) {
            GWT.log("No items found in StringOptionsData '" + groupTitle + "'");
            return;
        }

        for (DataItem item: items) {
            String title = item.getLabel();

            if (valueNames.indexOf(title) < 0) {
                valueNames.add(title);
            }

            col.addValue(item.getLabel(), item.getStringValue());
        }

        columnNames.add(groupTitle);
        columns.put(groupTitle, col);
    }


    public Widget create() {
        Grid grid = new Grid(valueNames.size()+1, columnNames.size() + 1);

        for (int i = 0, n = columnNames.size(); i < n; i++) {
            String columnName = columnNames.get(i);
            Column col        = columns.get(columnName);

            selected.put(columnName, new ArrayList<String>());

            grid.setWidget(0, i+1, createLabel(MESSAGE.getString(columnName)));

            for (int j = 0, o = valueNames.size(); j < o; j++) {
                String valueName = valueNames.get(j);
                String value     = col.getValue(valueName);

                if (i == 0) {
                    grid.setWidget(j+1, 0, createLabel(valueName));
                }

                if (value != null && value.length() > 0) {
                    grid.setWidget(j+1, i+1, createWidget(columnName, value));
                }
            }
        }

        return grid;
    }


    protected Label createLabel(String text) {
        Label label = new Label(text);
        label.setHeight(CELL_HEIGHT);

        return label;
    }


    protected CheckBox createWidget(final String colName, final String value) {
        CheckBox box = new CheckBox();
        box.addClickListener(new ClickListener() {
            @Override
            public void onClick(Widget sender) {
                CheckBox box = (CheckBox) sender;
                Map<String, List<String>> selection = getSelection();

                List<String> values = selection.get(colName);
                if (values.indexOf(value) >= 0) {
                    values.remove(value);
                }
                else {
                    values.add(value);
                }
            }
        });

        return box;
    }


    public Map<String, List<String>> getSelection() {
        return selected;
    }
}
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