package com.onaro.sanscreen.client.view.actions.application;

import java.awt.Component;
import java.util.Arrays;
import java.util.List;

import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JList;

import org.apache.commons.lang3.StringUtils;

import com.onaro.sanscreen.server.interfaces.data.inventory.BusinessEntity;

/**
 * Represents a combobox of BusinessEntity objects. Formats BEs as tenant.lob.bu.project.
 * 
 * @author rnoel
 * 
 */
public class BusinessEntityComboPicker extends JComboBox<BusinessEntity> {

    private static final long serialVersionUID = 1L;

    // If true then add a N/A BE to the list.
    private boolean addNaBE;

    public BusinessEntityComboPicker(boolean addNaBE) {
        this(new BusinessEntity[0], addNaBE);
    }

    public BusinessEntityComboPicker(BusinessEntity[] bes, boolean addNaBE) {
        this(Arrays.asList(bes), addNaBE);
    }

    public BusinessEntityComboPicker(List<BusinessEntity> bes, boolean addNaBE) {
        this.addNaBE = addNaBE;

        setRenderer(new BERenderer());
        setBusinessEntities(bes);
    }

    public void setBusinessEntities(List<BusinessEntity> bes) {
        removeAllItems();

        if (addNaBE) {
            addItem(BusinessEntityUtils.NA_BUSINESS_ENTITY);
        }
        for (BusinessEntity be : bes) {
            addItem(be);
        }
    }

    /* Sets the selected BE to the one that matches the given BE or do nothing if a matching BE could not be found. */
    protected void selectBusinessEntity(BusinessEntity be) {
        setSelectBusinessEntityById(be.getId());
    }

    /* Sets the selected BE to the one that matches the given ID or do nothing if a matching ID could not be found. */
    protected void setSelectBusinessEntityById(Long id) {
        if (id == null) {
            return;
        }
        int beCount = getItemCount();

        for (int i = 0; i < beCount; i++) {
            BusinessEntity be = getItemAt(i);

            if (id.equals(be.getId())) {
                setSelectedIndex(i);
                break;
            }
        }
    }

    /**
     * 
     * @return the selected BusinessEntity in the combobox or null if nothing is selected.
     */
    public BusinessEntity getSelectedBusinessEntity() {
        return ((BusinessEntity) getSelectedItem());
    }

    private static class BERenderer extends DefaultListCellRenderer {
        private static final long serialVersionUID = 1L;

        @Override
        public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected,
                boolean cellHasFocus) {
            BusinessEntity be = (BusinessEntity) value;
            String displayValue = StringUtils.EMPTY;

            if (be != null) {
                displayValue = BusinessEntityUtils.formatBusinessEntity(be);
            }
            return super.getListCellRendererComponent(list, displayValue, index, isSelected, cellHasFocus);
        }
    }
}