/*
 * 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.
 *
 * $Header:$
 */
package org.apache.beehive.netui.compiler;

import org.apache.beehive.netui.compiler.typesystem.declaration.TypeDeclaration;
import org.apache.beehive.netui.compiler.typesystem.declaration.ClassDeclaration;
import org.apache.beehive.netui.compiler.typesystem.declaration.AnnotationInstance;
import org.apache.beehive.netui.compiler.typesystem.declaration.FieldDeclaration;
import org.apache.beehive.netui.compiler.typesystem.type.TypeInstance;
import org.apache.beehive.netui.compiler.typesystem.type.DeclaredType;
import org.apache.beehive.netui.compiler.typesystem.env.CoreAnnotationProcessorEnv;

import java.util.*;
import java.io.File;


public class FlowControllerInfo
        extends SourceFileInfo
        implements JpfLanguageConstants
{
    private static final ActionInfo[] EMPTY_ACTION_INFO_ARRAY = new ActionInfo[0];
    
    private Set _actions = new HashSet();
    private Set _returnActions = null;
    private Map _sharedFlowTypes = Collections.EMPTY_MAP;
    private Map _sharedFlowTypeNames = Collections.EMPTY_MAP;
    private Map _sharedFlowFiles = Collections.EMPTY_MAP;
    private List _referencedFiles = new ArrayList();
    private boolean _isBuilding = false;
    private Map _messageBundlesByName = new HashMap();
    private boolean _navigateToActionEnabled = false;
    private boolean _navigateToPageEnabled = false;
    private boolean _isNested;
    private MergedControllerAnnotation _mergedControllerAnnotation;

    
    public static class ActionInfo
    {
        private String _name;
        private String _beanType = null;

        public ActionInfo( String name )
        {
            _name = name;
        }
        
        public ActionInfo( String name, String beanType )
        {
            _name = name;
            _beanType = beanType;
        }
        
        public void setBeanType( String beanType )
        {
            _beanType = beanType;
        }

        public String getName()
        {
            return _name;
        }

        public String getBeanType()
        {
            return _beanType;
        }
        
        public boolean equals( Object o )
        {
            if ( o == null || ! ( o instanceof ActionInfo ) )
            {
                return false;
            }
            
            ActionInfo other = ( ActionInfo ) o;
            if ( ! _name.equals( other.getName() ) ) return false;
            String otherBeanType = other.getBeanType();
            return ( ( _beanType == null && otherBeanType == null )
                     || ( _beanType != null && otherBeanType != null && _beanType.equals( otherBeanType ) ) );
        }
        
        public int hashCode()
        {
            int nameHash = _name.hashCode();
            if ( _beanType == null ) return nameHash;
            return nameHash != 0 ? _beanType.hashCode() % nameHash : _beanType.hashCode();
        }
    }
    
    
    public FlowControllerInfo( ClassDeclaration jclass )
    {
        super( CompilerUtils.getSourceFile( jclass, true ), jclass.getQualifiedName() );
    }
    
    void startBuild( CoreAnnotationProcessorEnv env, ClassDeclaration jclass )
    {
        _isBuilding = true;
        _mergedControllerAnnotation = new MergedControllerAnnotation( jclass );
        _isNested = _mergedControllerAnnotation.isNested();
        setSharedFlowInfo( env );
    }
    
    void endBuild()
    {
        _isBuilding = false;
        _sharedFlowTypes = null;    // don't hang onto ClassDeclarations
        _mergedControllerAnnotation = null;
    }
    
    public ActionInfo[] getActions()
    {
        return ( ActionInfo[] ) _actions.toArray( new ActionInfo[ _actions.size() ] );
    }

    public boolean isNested()
    {
        return _isNested;
    }

    public ActionInfo[] getReturnActions()
    {
        if ( _returnActions == null )
        {
            return EMPTY_ACTION_INFO_ARRAY;
        }
        
        return ( ActionInfo[] ) _returnActions.toArray( new ActionInfo[ _returnActions.size() ] );
    }
    
    public String getFormBeanType( String actionName )
    {
        String bestType = null;
        
        for ( Iterator ii = _actions.iterator(); ii.hasNext(); )  
        {
            ActionInfo actionInfo = ( ActionInfo ) ii.next();
            if ( actionInfo.getName().equals( actionName ) )
            {
                String beanType = actionInfo.getBeanType();
                
                //
                // In the case of overloaded actions, the non-form-bean action takes precedence.  Otherwise,
                // we look at the bean type names in alphabetical order.
                //
                if ( beanType == null ) return null;
                else if ( bestType == null ) bestType = beanType;
                else if ( beanType.compareTo( bestType ) < 0 ) bestType = beanType;
            }
        }
        
        return bestType;
    }

    int countReturnActions()
    {
        return _returnActions != null ? _returnActions.size() : 0;
    }

    public void addAction( String actionName, String formBeanType )
    {
        _actions.add( new ActionInfo( actionName, formBeanType ) );
    }
    
    public void addReturnAction( String returnActionName, String formBeanType )
    {
        if ( _returnActions == null ) _returnActions = new HashSet();
        _returnActions.add( new ActionInfo( returnActionName, formBeanType ) );
    }
    
    /**
     * Get a list of referenced files (files that appear in Jpf.Forward paths).
     */ 
    public List getReferencedFiles()
    {
        return _referencedFiles;
    }
    
    public void addReferencedFile( File file )
    {
        if ( ! file.equals( getSourceFile() ) )
        {
            _referencedFiles.add( file );
        }
    }
    
    private void setSharedFlowInfo( CoreAnnotationProcessorEnv env )
    {
        //
        // First, find all referenced Shared Flow types.
        //
        _sharedFlowTypes = new LinkedHashMap();
        
        Collection sharedFlowRefs = _mergedControllerAnnotation.getSharedFlowRefs();
        
        if ( sharedFlowRefs != null )
        {
            for ( Iterator i = sharedFlowRefs.iterator(); i.hasNext(); )  
            {
                AnnotationInstance sharedFlowRef = ( AnnotationInstance ) i.next();
                String name = CompilerUtils.getString( sharedFlowRef, NAME_ATTR, true );
                TypeInstance type = CompilerUtils.getTypeInstance( sharedFlowRef, TYPE_ATTR, true );
                
                if ( type instanceof DeclaredType )   // if it's not a DeclaredType, the error will be caught elsewhere.
                {
                    TypeDeclaration typeDecl = ( ( DeclaredType ) type ).getDeclaration();
                    
                    if ( typeDecl != null )     // If the declaration is null, it's an error type.
                    {
                        _sharedFlowTypes.put( name, typeDecl );
                    }
                }
            }
        }
        
        //
        // If there's no SharedFlowController, fall back to the deprecated Global.app.
        //
        if ( _sharedFlowTypes.isEmpty() )
        {
            TypeDeclaration type = env.getTypeDeclaration( GLOBALAPP_FULL_CLASSNAME );
            if ( type != null ) _sharedFlowTypes.put( GLOBALAPP_SHARED_FLOW_NAME, type );
        }
  
        _sharedFlowTypeNames = new LinkedHashMap();
        _sharedFlowFiles = new LinkedHashMap();
        
        for ( Iterator i = _sharedFlowTypes.entrySet().iterator(); i.hasNext(); )  
        {
            Map.Entry entry = ( Map.Entry ) i.next();
            TypeDeclaration type = ( TypeDeclaration ) entry.getValue();
            _sharedFlowTypeNames.put( entry.getKey(), type.getQualifiedName() );
            File file = CompilerUtils.getSourceFile( type, false );
            
            if ( file != null )
            {
                _sharedFlowFiles.put( entry.getKey(), file );
                _referencedFiles.add( file );
            }
        }
    }
    
    public Map getSharedFlowTypes()
    {
        assert _isBuilding : "use getSharedFlowTypeNames after check or generate phases";
        return _sharedFlowTypes;
    }

    public Map getSharedFlowTypeNames()
    {
        return _sharedFlowTypeNames;
    }

    public MergedControllerAnnotation getMergedControllerAnnotation()
    {
        assert _isBuilding : "only valid during the check or generate phases";
        return _mergedControllerAnnotation;
    }

    public Map getMessageBundlesByName()
    {
        return _messageBundlesByName;
    }

    public void addMessageBundle( String bundleName, String bundlePath )
    {
        _messageBundlesByName.put( bundleName, bundlePath );
    }
    
    public String getControllerClassName()
    {
        return getClassName();
    }

    public Map getSharedFlowFiles()
    {
        return _sharedFlowFiles;
    }
    
    public void enableNavigateToAction()
    {
        _navigateToActionEnabled = true;
    }
    
    public void enableNavigateToPage()
    {
        _navigateToPageEnabled = true;
    }

    public boolean isNavigateToActionEnabled()
    {
        return _navigateToActionEnabled;
    }

    public boolean isNavigateToPageEnabled()
    {
        return _navigateToPageEnabled;
    }
    
    /**
     * Add a return-action from an annotation.
     * @return the form bean type, or null</code> if there is no form bean.
     */ 
    public TypeInstance addReturnAction( String returnActionName, AnnotationInstance annotation, TypeDeclaration outerType )
    {
        TypeInstance formBeanType = CompilerUtils.getTypeInstance( annotation, OUTPUT_FORM_BEAN_TYPE_ATTR, true );
        
        if ( formBeanType == null )
        {
            String memberFieldName = CompilerUtils.getString( annotation, OUTPUT_FORM_BEAN_ATTR, true );
            
            if ( memberFieldName != null )
            {
                FieldDeclaration field = CompilerUtils.findField( outerType, memberFieldName );
                if ( field != null ) formBeanType = field.getType();
            }
        }
        
        String formTypeName =
                formBeanType != null && formBeanType instanceof DeclaredType
                ? CompilerUtils.getDeclaration( ( DeclaredType ) formBeanType ).getQualifiedName()
                : null;
        addReturnAction( returnActionName, formTypeName );
        return formBeanType;
    }
}