// This Source Code is in the Public Domain per: http://litesoft.org/License.txt
package org.litesoft.GWT.server;

import org.litesoft.GWT.client.widgets.datatables.*;
import org.litesoft.commonfoundation.base.*;
import org.litesoft.commonfoundation.typeutils.*;
import org.litesoft.orsup.base.*;

import com.google.gwt.user.client.ui.*;

public class ReportColumnDefinition<T extends PersistentObject> extends TableColumnDefinition<T>
{
    private final ValueAccessor<T> mValueAccessor;

    public ReportColumnDefinition( HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, String pHeaderText )
    {
        this( null, pHorizontalAlignment, null, pHeaderText );
    }

    public ReportColumnDefinition( HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, String pHeaderText, TableCellRenderer.Builder pCellRendererBuilder )
    {
        this( new ReportCellRenderer<T>( pCellRendererBuilder ), pHorizontalAlignment, null, pHeaderText );
    }

    public ReportColumnDefinition( HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, String pHeaderText, ReportCellRenderer<T> pCellRenderer )
    {
        this( pCellRenderer, pHorizontalAlignment, null, pHeaderText );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath )
    {
        this( null, null, pAttributeNamePath, null );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, TableCellRenderer.Builder pCellRendererBuilder )
    {
        this( new ReportCellRenderer<T>( pCellRendererBuilder ), null, pAttributeNamePath, null );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, ReportCellRenderer<T> pCellRenderer )
    {
        this( pCellRenderer, null, pAttributeNamePath, null );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, String pHeaderText )
    {
        this( null, null, pAttributeNamePath, pHeaderText );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, String pHeaderText, TableCellRenderer.Builder pCellRendererBuilder )
    {
        this( new ReportCellRenderer<T>( pCellRendererBuilder ), null, pAttributeNamePath, pHeaderText );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, String pHeaderText, ReportCellRenderer<T> pCellRenderer )
    {
        this( pCellRenderer, null, pAttributeNamePath, pHeaderText );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, TableCellRenderer.Builder pCellRendererBuilder )
    {
        this( new ReportCellRenderer<T>( pCellRendererBuilder ), pHorizontalAlignment, pAttributeNamePath, null );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, ReportCellRenderer<T> pCellRenderer )
    {
        this( pCellRenderer, pHorizontalAlignment, pAttributeNamePath, null );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, String pHeaderText, HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, TableCellRenderer.Builder pCellRendererBuilder )
    {
        this( new ReportCellRenderer<T>( pCellRendererBuilder ), pHorizontalAlignment, pAttributeNamePath, pHeaderText );
    }

    public ReportColumnDefinition( String[] pAttributeNamePath, String pHeaderText, HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, ReportCellRenderer<T> pCellRenderer )
    {
        this( pCellRenderer, pHorizontalAlignment, pAttributeNamePath, pHeaderText );
    }

    public ReportColumnDefinition( ReportCellRenderer<T> pCellRenderer, HasHorizontalAlignment.HorizontalAlignmentConstant pHorizontalAlignment, String[] pAttributeNamePath, String pHeaderText )
    {
        super( null, ReportCellRenderer.deNull( pCellRenderer ) );
        if ( pHorizontalAlignment != null )
        {
            align( pHorizontalAlignment );
        }
        if ( null == (pAttributeNamePath = Strings.noEmpty( pAttributeNamePath )) )
        {
            if ( pHeaderText == null )
            {
                throw new IllegalArgumentException( "Either HeaderText or the AttibuteNamePath must not be null" );
            }
            header( pHeaderText );
            mValueAccessor = new InvalidValueAccessor<T>();
        }
        else
        {
            header( (pHeaderText != null) ? pHeaderText : DeCamelizer.resolve( pAttributeNamePath[pAttributeNamePath.length - 1] ) );
            if ( pAttributeNamePath.length == 1 )
            {
                mValueAccessor = new DirectValueAccessor<T>( pAttributeNamePath[0] );
            }
            else
            {
                mValueAccessor = new PathValueAccessor<T>( pAttributeNamePath );
            }
        }
    }

    @SuppressWarnings({"unchecked"}) @Override
    public Object getCellValue( T pRowValue )
    {
        return mValueAccessor.getValue( pRowValue );
    }

    private interface ValueAccessor<T extends PersistentObject>
    {
        public Object getValue( T pRowValue );
    }

    private static class InvalidValueAccessor<T extends PersistentObject> implements ValueAccessor<T>
    {
        @Override
        public Object getValue( T pRowValue )
        {
            throw new IllegalStateException( "getCellValue( T ) Not Overridden" );
        }
    }

    private static class DirectValueAccessor<T extends PersistentObject> implements ValueAccessor<T>
    {
        private String mAttributeName;

        public DirectValueAccessor( String pAttributeName )
        {
            mAttributeName = pAttributeName;
        }

        @Override
        public Object getValue( T pRowValue )
        {
            return pRowValue.getAttributeValue( mAttributeName );
        }
    }

    private static class PathValueAccessor<T extends PersistentObject> implements ValueAccessor<T>
    {
        private String[] mAttributeNamePath;
        private int mLastIndex;

        public PathValueAccessor( String[] pAttributeNamePath )
        {
            mLastIndex = (mAttributeNamePath = pAttributeNamePath).length - 1;
        }

        @Override
        public Object getValue( T pRowValue )
        {
            PersistentObject zPO = pRowValue;
            for ( int i = 0; i < mLastIndex; i++ )
            {
                String zAttributeName = mAttributeNamePath[i];
                if ( null == (zPO = (PersistentObject) zPO.getAttributeValue( zAttributeName )) )
                {
                    return null;
                }
            }
            return zPO.getAttributeValue( mAttributeNamePath[mLastIndex] );
        }
    }
}