/**
 * 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.
 */

package org.apache.cxf.tools.corba.processors.idl;

import javax.wsdl.Definition;
import javax.xml.namespace.QName;

import antlr.collections.AST;

import org.apache.cxf.binding.corba.wsdl.Alias;
import org.apache.cxf.binding.corba.wsdl.CorbaConstants;
import org.apache.cxf.binding.corba.wsdl.CorbaTypeImpl;
import org.apache.ws.commons.schema.XmlSchema;
import org.apache.ws.commons.schema.XmlSchemaType;
import org.apache.ws.commons.schema.constants.Constants;

public class TypedefVisitor extends VisitorBase {
    
    public TypedefVisitor(Scope scope,
                          Definition defn,
                          XmlSchema schemaRef,
                          WSDLASTVisitor wsdlVisitor) {
        super(scope, defn, schemaRef, wsdlVisitor);
    }
    
    public static boolean accept(AST node) {
        if (node.getType() == IDLTokenTypes.LITERAL_typedef) {
            return true;
        }
        return false;
    }
    
    public void visit(AST typedefNode) {
        // "typedef" <type_declarator>
        // <type_declarator> ::= <type_spec> <declarators>

        AST typeDeclaratorNode = typedefNode.getFirstChild();
        AST identifierNode = TypesUtils.getCorbaTypeNameNode(typeDeclaratorNode);
        TypesVisitor typesVisitor = new TypesVisitor(getScope(),
                                                     definition,
                                                     schema,
                                                     wsdlVisitor,
                                                     identifierNode);
        typesVisitor.visit(typeDeclaratorNode);

        XmlSchemaType schemaType = typesVisitor.getSchemaType();
        CorbaTypeImpl corbaType = typesVisitor.getCorbaType();
        Scope fullyQualifiedName = typesVisitor.getFullyQualifiedName();
        Scope typedefScope = new Scope(getScope(), identifierNode);
        
        if (SequenceVisitor.accept(typeDeclaratorNode)
            || FixedVisitor.accept(typeDeclaratorNode)) {
            // Handle cases "typedef sequence"
            //              "typedef fixed"
            DeclaratorVisitor declaratorVisitor = new DeclaratorVisitor(typedefScope,
                                                                        definition,
                                                                        schema,
                                                                        wsdlVisitor,
                                                                        schemaType,
                                                                        corbaType,
                                                                        fullyQualifiedName);
            declaratorVisitor.visit(identifierNode);

        } else if (StringVisitor.accept(typeDeclaratorNode)) {
            // Handle cases "typedef string"
            //              "typedef wstring"

            if (StringVisitor.isBounded(typeDeclaratorNode)
                && !wsdlVisitor.getBoundedStringOverride()) {
                DeclaratorVisitor declaratorVisitor = new DeclaratorVisitor(typedefScope,
                                                                            definition,
                                                                            schema,
                                                                            wsdlVisitor,
                                                                            schemaType,
                                                                            corbaType,
                                                                            fullyQualifiedName);
                declaratorVisitor.visit(identifierNode);
  
            } else {
                // unbounded string type is already in the XmlSchema and only needs to be added
                // to the CorbaTypeMap, therefore we cannot use DeclaratorVisitor here.
                
                while (identifierNode != null) {
                    if (ArrayVisitor.accept(identifierNode)) {
                        ArrayVisitor arrayVisitor = new ArrayVisitor(new Scope(getScope(),
                                                                               identifierNode.getText()),
                                                                     definition,
                                                                     schema,
                                                                     wsdlVisitor,
                                                                     identifierNode,
                                                                     fullyQualifiedName);
                        arrayVisitor.setSchemaType(schemaType);
                        arrayVisitor.setCorbaType(corbaType);
                        arrayVisitor.visit(identifierNode);

                    } else {
                        generateStringAlias(typeDeclaratorNode,
                                            identifierNode,
                                            schemaType,
                                            corbaType,
                                            fullyQualifiedName);
                    }
                    identifierNode = identifierNode.getNextSibling();
                }
            }

        } else {
            // typedef used to define an alias
            // if declaring an array, do not generate aliases
            if (!ArrayVisitor.accept(identifierNode)) {
                generateAlias(identifierNode,
                              schemaType,
                              corbaType,
                              fullyQualifiedName);
                corbaType = getCorbaType();
            }
            DeclaratorVisitor declaratorVisitor = new DeclaratorVisitor(typedefScope,
                                                                        definition,
                                                                        schema,
                                                                        wsdlVisitor,
                                                                        schemaType,
                                                                        corbaType,
                                                                        fullyQualifiedName);
            declaratorVisitor.visit(identifierNode);
        
        }


        setSchemaType(schemaType);
        setCorbaType(corbaType);
        setFullyQualifiedName(fullyQualifiedName);
    }    
    
    private void generateAlias(AST identifierNode,
                               XmlSchemaType schemaType,
                               CorbaTypeImpl corbaType,
                               Scope fqName) {
    
        Scope scopedName = new Scope(getScope(), identifierNode);
        // corba:alias
        Alias alias = new Alias();
        alias.setQName(new QName(typeMap.getTargetNamespace(), scopedName.toString()));
        if (corbaType != null) {
            alias.setBasetype(corbaType.getQName());
        // if (schemaType == null) might not be correct here
        } else if (schemaType == null) {
            wsdlVisitor.getDeferredActions().
                add(fqName, new TypedefDeferredAction(alias));
            scopedNames.add(scopedName);         
        }
        alias.setRepositoryID(scopedName.toIDLRepositoryID());
        
        // add corba:alias
        setCorbaType(alias);
    }
    
    private void generateStringAlias(AST typeDeclaratorNode,
                                     AST identifierNode,
                                     XmlSchemaType schemaType,
                                     CorbaTypeImpl corbaType,
                                     Scope fqName) {
        
        Scope typedefScope = new Scope(getScope(), identifierNode);
        
        Alias corbaString = new Alias();
        if (typeDeclaratorNode.getType() == IDLTokenTypes.LITERAL_string) {
            corbaString.setBasetype(CorbaConstants.NT_CORBA_STRING);
        } else if (typeDeclaratorNode.getType() == IDLTokenTypes.LITERAL_wstring) {
            corbaString.setBasetype(CorbaConstants.NT_CORBA_WSTRING);
        } else { 
            // should never get here
            throw new RuntimeException("[TypedefVisitor] Attempted to visit an invalid node: "
                                       + typeDeclaratorNode.toString());
        }
        Scope newScope = new Scope(typedefScope.getParent(), identifierNode);
        corbaString.setQName(new QName(typeMap.getTargetNamespace(), newScope.toString()));
        corbaString.setType(Constants.XSD_STRING);
        corbaString.setRepositoryID(newScope.toIDLRepositoryID());       

        typeMap.getStructOrExceptionOrUnion().add(corbaString);

    }
    
    
}
