package com.onaro.sanscreen.client.view.tabular;

import org.apache.commons.lang3.StringUtils;
import org.eclipse.core.runtime.IAdaptable;

import com.onaro.sanscreen.client.SANscreenClientPlugin;
import com.onaro.util.enumeration.EnumPresentation;
import com.onaro.util.enumeration.EnumPresentation.Attributes;
import com.onaro.util.jfc.tables.filter.EnumFilter;
import com.onaro.util.jfc.tables.renderers.SimpleTableCellRenderer;

public abstract class EnumTabularColumn extends AdaptableTabularColumn {
    
    private static final long serialVersionUID = 1L;

    protected EnumPresentation enumPresentation;
    
    /**
     * Used for caching the enum attributes map so it wouldn't need to be retrieved every time getValueAt is called
     */
    protected EnumPresentation.AttributesMap enumAttributesMap;
    
    protected String enumType;
    
    protected SimpleTableCellRenderer simpleTableCellRenderer;
    
    protected boolean showUnknownValues = false;
    
    public EnumTabularColumn(String id, String name, String enumType) {
        this(id, name, SANscreenClientPlugin.getDefault().getEnumPresentation(), enumType);
    }

    public EnumTabularColumn(String id, EnumPresentation enumPresentation, String enumType) {
        this(id, StringUtils.EMPTY, enumPresentation, enumType);
    }

    public EnumTabularColumn(String id, String name, EnumPresentation enumPresentation, String enumType) {
        super(id, EnumPresentation.Attributes.class, name);
        if (enumPresentation == null) throw new IllegalArgumentException("enumPresentation"); //$NON-NLS-1$
        if (StringUtils.isBlank(enumType)) throw new IllegalArgumentException("enumType"); //$NON-NLS-1$
        
        this.enumPresentation = enumPresentation;
        this.enumType = enumType;
    
        EnumPresentation.Attributes[] values = enumPresentation.getValues(enumType);
        if (values == null || values.length == 0) { 
            throw new IllegalArgumentException("Unknown enum type: " + enumType); //$NON-NLS-1$
        }
        
        setFilter(new EnumFilter(values));
        simpleTableCellRenderer = new SimpleTableCellRenderer();
        setCellRenderer(simpleTableCellRenderer);
        
        enumAttributesMap = enumPresentation.getEnumAttributes(enumType);
    }
    
    /**
     * Set the renderer alignment. This should be one of the SwingConstants.
     * @see javax.swing.SwingConstants
     * @param alignment the alignment to set
     */
    public void setAlignment(int alignment) {
        simpleTableCellRenderer.setHorizontalAlignment(alignment);
    }
    
    public int getAlignment() {
        return simpleTableCellRenderer.getHorizontalAlignment();
    }
        
    public boolean isShowUnknownValues() {
        return showUnknownValues;
    }

    public void setShowUnknownValues(boolean showUnknownValues) {
        this.showUnknownValues = showUnknownValues;
    }

    /**
     * Retrieve the enum value key to use to represent this row
     * @param rowObj the row object
     * @return the enum key, null if there's no value for this row
     * @throws Exception if there's an error retrieving the value for the row
     */
    public abstract String getEnumKeyForRow(IAdaptable rowObj) throws Exception;

    @Override
    public EnumPresentation.Attributes getValue(IAdaptable rowObj) throws Exception {
        String enumKey = getEnumKeyForRow(rowObj);
        if (StringUtils.isBlank(enumKey)) {
            return null;
        }
        
        Attributes attributes = enumPresentation.getAttributes(enumAttributesMap, enumType, enumKey);
        
        if (attributes == null) {
            // try again with upper cased
            attributes = enumPresentation.getAttributes(enumAttributesMap, enumType, enumKey.toUpperCase());
        }
        
        // If the value is not in the enum presentation and unknown values should be shown
        if (attributes == null && isShowUnknownValues()) {
            // Create a new attribute value to represent the key text
            attributes = new Attributes(enumKey,enumKey);
        }
        
        return attributes;
    }

}