package org.apache.commons.ognl;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.commons.ognl.enhance.ExpressionCompiler;
import org.apache.commons.ognl.enhance.OgnlExpressionCompiler;
import org.apache.commons.ognl.enhance.UnsupportedCompilationException;

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

/**
 * $Id$
 */
public class ASTList
    extends SimpleNode
    implements NodeType
{
    public ASTList( int id )
    {
        super( id );
    }

    public ASTList( OgnlParser p, int id )
    {
        super( p, id );
    }

    protected Object getValueBody( OgnlContext context, Object source )
        throws OgnlException
    {
        List answer = new ArrayList( jjtGetNumChildren() );
        for ( int i = 0; i < jjtGetNumChildren(); ++i )
        {
            answer.add( children[i].getValue( context, source ) );
        }
        return answer;
    }

    public Class getGetterClass()
    {
        return null;
    }

    public Class getSetterClass()
    {
        return null;
    }

    public String toGetSourceString( OgnlContext context, Object target )
    {
        StringBuilder result = new StringBuilder();
        boolean array = parent instanceof ASTCtor && ((ASTCtor) parent).isArray();

        context.setCurrentType( List.class );
        context.setCurrentAccessor( List.class );

        if ( !array )
        {
            if ( jjtGetNumChildren() < 1 )
            {
                return "java.util.Arrays.asList( new Object[0])";
            }
            result.append("java.util.Arrays.asList( new Object[] ");
        }

        result.append("{ ");

        try
        {

            for ( int i = 0; i < jjtGetNumChildren(); ++i )
            {
                if ( i > 0 )
                {
                    result.append(", ");
                }

                Class prevType = context.getCurrentType();

                Object objValue = children[i].getValue( context, context.getRoot() );
                String value = children[i].toGetSourceString( context, target );

                // to undo type setting of constants when used as method parameters
                if (children[i] instanceof ASTConst)
                {

                    context.setCurrentType( prevType );
                }

                value = ExpressionCompiler.getRootExpression( children[i], target, context ) + value;

                String cast = "";
                if ( ExpressionCompiler.shouldCast( children[i] ) )
                {

                    cast = (String) context.remove( ExpressionCompiler.PRE_CAST );
                }
                if ( cast == null )
                {
                    cast = "";
                }

                if ( !(children[i] instanceof ASTConst))
                {
                    value = cast + value;
                }
                Class ctorClass = (Class) context.get( "_ctorClass" );
                if ( array && ctorClass != null && !ctorClass.isPrimitive() )
                {

                    Class valueClass = value != null ? value.getClass() : null;
                    if ( NodeType.class.isAssignableFrom( children[i].getClass() ) )
                    {
                        valueClass = ( (NodeType) children[i] ).getGetterClass();
                    }
                    final OgnlExpressionCompiler compiler = OgnlRuntime.getCompiler( context );
                    if ( valueClass != null && ctorClass.isArray() )
                    {

                        value =
                            compiler
                                .createLocalReference( context, "(" + ExpressionCompiler.getCastString( ctorClass )
                                    + ")org.apache.commons.ognl.OgnlOps.toArray(" + value + ", "
                                    + ctorClass.getComponentType().getName() + ".class, true)", ctorClass );

                    }
                    else if ( ctorClass.isPrimitive() )
                    {

                        Class wrapClass = OgnlRuntime.getPrimitiveWrapperClass( ctorClass );

                        value =
                            compiler
                                .createLocalReference( context, "((" + wrapClass.getName()
                                    + ")org.apache.commons.ognl.OgnlOps.convertValue(" + value + ","
                                    + wrapClass.getName() + ".class, true))." + OgnlRuntime.getNumericValueGetter(
                                    wrapClass ), ctorClass );
                    }
                    else if ( ctorClass != Object.class )
                    {

                        value =
                            compiler
                                .createLocalReference( context, "(" + ctorClass.getName()
                                    + ")org.apache.commons.ognl.OgnlOps.convertValue(" + value + ","
                                    + ctorClass.getName() + ".class)", ctorClass );

                    }
                    else if ( ( children[i] instanceof NodeType
                        && ( (NodeType) children[i] ).getGetterClass() != null
                        && Number.class.isAssignableFrom( ( (NodeType) children[i] ).getGetterClass() ) )
                        || valueClass.isPrimitive() )
                    {

                        value = " ($w) (" + value + ")";
                    }
                    else if ( valueClass.isPrimitive() )
                    {
                        value = "($w) (" + value + ")";
                    }

                }
                else if ( ctorClass == null || !ctorClass.isPrimitive() )
                {

                    value = " ($w) (" + value + ")";
                }

                if ( objValue == null || value.isEmpty() )
                {
                    value = "null";
                }
                result.append(value);
            }

        }
        catch ( Throwable t )
        {
            throw OgnlOps.castToRuntime( t );
        }

        context.setCurrentType( List.class );
        context.setCurrentAccessor( List.class );

        result.append("}");

        if ( !array )
        {
            result.append(")");
        }
        return result.toString();
    }

    public String toSetSourceString( OgnlContext context, Object target )
    {
        throw new UnsupportedCompilationException( "Can't generate setter for ASTList." );
    }

    public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data )
        throws OgnlException
    {
        return visitor.visit( this, data );
    }
}