/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.wsdl.internal.generator;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.xml.namespace.QName;

import org.eclipse.wst.wsdl.Binding;
import org.eclipse.wst.wsdl.BindingFault;
import org.eclipse.wst.wsdl.BindingInput;
import org.eclipse.wst.wsdl.BindingOperation;
import org.eclipse.wst.wsdl.BindingOutput;
import org.eclipse.wst.wsdl.Definition;
import org.eclipse.wst.wsdl.ExtensibilityElement;
import org.eclipse.wst.wsdl.ExtensibleElement;
import org.eclipse.wst.wsdl.Fault;
import org.eclipse.wst.wsdl.Input;
import org.eclipse.wst.wsdl.Operation;
import org.eclipse.wst.wsdl.Output;
import org.eclipse.wst.wsdl.Port;
import org.eclipse.wst.wsdl.PortType;
import org.eclipse.wst.wsdl.Service;
import org.eclipse.wst.wsdl.WSDLFactory;
import org.eclipse.wst.wsdl.internal.generator.extension.ContentGeneratorExtensionFactoryRegistry;

/*
 * Class used to generate the Binding and it's content.  We look in the registry for
 * appropriate ContentGenerator classes based on the existing Binding Content's namespace.
 * Alternatively, users can pass in a namespace through the constructor to specify which
 * namespace to use when searching the registry.
 * 
 * The ContentGenerator may also be set manually by calling
 * setContentGenerator(ContentGenerator).
 */
public class BindingGenerator extends BaseGenerator {
	private WSDLFactory factory = WSDLFactory.eINSTANCE;
	private Binding binding;

	/*
	 * When the constructor is used, automatically attempt to retrieve a proper
	 * ContentGenerator based on the Binding given.  The ContentGenerator may
	 * be replaced by calling setContentGenerator(ContentGenerator).
	 */
	public BindingGenerator(Definition definition, Binding binding) {	
		this.definition = definition;
		this.binding = binding;
		contentGenerator = getContentGenerator(binding);
	}

	/*
	 * When the constructor is used, automatically attempt to retrieve a proper
	 * ContentGenerator based on the namespace given.  The ContentGenerator may
	 * be replaced by calling setContentGenerator(ContentGenerator).
	 */
	public BindingGenerator(Definition definition, Binding binding, String namespace) {
		this.definition = definition;
		this.binding = binding;
		contentGenerator = getContentGenerator(namespace);
	}

	public static ContentGenerator getContentGenerator(Binding binding) {
		if (binding == null) {
			return null;
		}
		/******************************************************
		 * Find the regeistered Content Generator for the Binding
		 ******************************************************/
		// Get BindingContent namespace
		String namespace = null;
		List eeList = binding.getEExtensibilityElements();
		if (eeList.size() > 0) {
	        ExtensibilityElement ee = (ExtensibilityElement) eeList.get(0);			
			// TODO: QName qName = ee.getElementType(); go get the namespace instead?
	        namespace = ee.getElement().getNamespaceURI();
			return getContentGenerator(namespace);
		}
	
		return null;
	}
	
	public static ContentGenerator getContentGenerator(String namespace) {
		ContentGenerator contentGen = null;
		if (namespace != null) {
			ContentGeneratorExtensionFactoryRegistry factoryRegistry = ContentGeneratorExtensionFactoryRegistry.getInstance(); 
			contentGen = factoryRegistry.getGeneratorClassFromNamespace(namespace);
		}
		
		return contentGen;		
	}
	
	private Binding createEmptyBinding(String localName) {
		String name = localName;
		if (localName == null) {
			name = "";
		}
	    Binding newBinding = WSDLFactory.eINSTANCE.createBinding();
		newBinding.setQName(new QName(definition.getTargetNamespace(),localName));
		newBinding.setEnclosingDefinition(definition);
	    definition.addBinding(newBinding);
		
		return newBinding;
	}

	/*
	 * TODO: Scenario:
	 * 1)overwrite == false
	 * 2)BindingOperation with 1 input
	 * 3)Corresponding Operation (with same name) with 1 input and 1 output
	 * If we generate with overwrite == false, nothing is done.  Thus,  an
	 * output is not generated on the BindingOperation.  This is because we
	 * search for existing Elements only at the level of BindingOperations.
	 * For example, if there is a corresponding BindingOperation with the same
	 * name as our Operation, leave it alone.... but since there is already
	 * a BindingOperation with the same name, we don't create a new BindingOperation.
	 * 
	 * The correct implementation is reduce this granularity to the MessageReference
	 * level.  The code is almost there except for how we generate the Binding element
	 * content.  Look at BindingGenrator.generateBindingOperation() and
	 * SOAPContentGenerator.java and it's content generation method
	 * for a good place to start.
	 * 
	 * For wtp RC1, We shall only look at the Operation level (as we do in the previous
	 * version).
	 */
	public Binding generateBinding() {
		try {
		// If Binding is null (No Binding was passed into the constructor), we create an empty Binding first.
		if (binding == null) {
			binding = createEmptyBinding(getName());
		}
		if (getName() != null && !binding.getQName().getLocalPart().equals(getName())) {
			binding.setQName(new QName(binding.getQName().getNamespaceURI(), getName()));
		}
		if (getRefName() != null) {
			PortType portType = getPortType();
			binding.setEPortType(portType);
			if (portType == null) {
				//The model doesn't reconile with it's Element properly when we're setting a null for it's PortType
				binding.getElement().setAttribute("type", "");
			}
		}

		List bindingOperations = binding.getEBindingOperations();		
		PortType portType = binding.getEPortType();
		
		if (!getOverwrite()) {
			// Don't Overwrite
			if (portType == null) {
				return binding;
			}
			else {
				addRequiredNamespaces(binding);				
				List operations = portType.getOperations();
				
				/*******************************************************************************
				 * Determine which Operations require new a new corresponding BindingOperations
				 *******************************************************************************/
				List newBindingOpsNeeded = new ArrayList();
				for (int index = 0; index < operations.size(); index++) {
					Operation operation = (Operation) operations.get(index);
					
					boolean foundMatch = false;
					Iterator bindingOperationsIt = bindingOperations.iterator();
					while (bindingOperationsIt.hasNext()) {
						BindingOperation bindingOperation = (BindingOperation) bindingOperationsIt.next();
						
						if (namesEqual(bindingOperation.getName(), operation.getName())) {
							foundMatch = true;
							break;
						}
					}
					
					if (!foundMatch){
						newBindingOpsNeeded.add(operation);
					}
				}
				// newBindingOpsNeeded is the List of Operations needing new corresponding
				// BindingOperation's
				List newBindingOps = createNewBindingOperations(newBindingOpsNeeded);
				
				// Generate the contents of the new BindingOperation's
				Iterator newBindingOpsIt = newBindingOps.iterator();
				while (newBindingOpsIt.hasNext()) {
					BindingOperation newBindingOp = (BindingOperation) newBindingOpsIt.next();
					generateBindingOperation(newBindingOp);
					generateBindingOperationContent(newBindingOp);
				}
			}
			
			generateBindingContent(binding);	
		}
		else {
			// Overwrite
			if (portType == null) {
				// We need to blow away everything under the Binding.  No PortType associated with this Binding
				bindingOperations.clear();
				return binding;
			}
			else {
				addRequiredNamespaces(binding);				
				List operations = portType.getOperations();
				
				/******************************************************
				 * Compare the Operations
				 ******************************************************/
				// Remove any BindingOperations which are no longer used
				for (int index = 0; index < bindingOperations.size(); index++) {
					BindingOperation bindingOperation = (BindingOperation) bindingOperations.get(index);
					
					boolean foundMatch = false;
					Iterator operationsIt = operations.iterator();
					while (operationsIt.hasNext()) {
						Operation operation = (Operation) operationsIt.next();
						
						if (namesEqual(bindingOperation.getName(), operation.getName())) {
							foundMatch = true;
							break;
						}
					}
					
					if (!foundMatch){
						// We need to remove this BindingFault from the bindingFaults List
						bindingOperations.remove(index);
						index--;
					}			
				}
				
				// Remove any Operations which already exists in bindingOperations.  What we
				// have left are the Operations which needs newly created BindingOperations
				List bindingOperationsNeeded = new ArrayList();
				for (int index = 0; index < operations.size(); index++) {
					Operation operation = (Operation) operations.get(index);
					
					boolean foundMatch = false;
					Iterator bindingOperationsIt = bindingOperations.iterator();
					while (bindingOperationsIt.hasNext()) {
						BindingOperation bindingOperation = (BindingOperation) bindingOperationsIt.next();
						
						if (namesEqual(bindingOperation.getName(), operation.getName())) {
							foundMatch = true;
							break;
						}
					}
					
					if (!foundMatch){
						// We need to remove this BindingFault from the bindingFaults List
						bindingOperationsNeeded.add(operation); // Store the actual Operation
					}			
				}		
				
				// Create required BindingOperations
				createNewBindingOperations(bindingOperationsNeeded);

				/******************************************************
				 * Process the contents of the Operations
				 ******************************************************/
				Iterator bindingOperationsIt = binding.getEBindingOperations().iterator();
				while (bindingOperationsIt.hasNext()) {
					generateBindingOperation((BindingOperation) bindingOperationsIt.next());
				}
				
				generateBindingContent(binding);
				
				return binding;
			}			
		}
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	private List createNewBindingOperations(List operations) {
		List newBindingOps = new ArrayList();
		
		Iterator neededBindingOperationsIt = operations.iterator();
		while (neededBindingOperationsIt.hasNext()) {
			Operation operation = (Operation) neededBindingOperationsIt.next();
			BindingOperation newBindingOperation = factory.createBindingOperation();
			newBindingOperation.setEOperation(operation);
			newBindingOperation.setName(operation.getName());
			binding.addBindingOperation(newBindingOperation);
			
			newBindingOps.add(newBindingOperation);
		}
		
		return newBindingOps;
	}
	
	private void generateBindingOperation(BindingOperation bindingOperation) {
		BindingInput bindingInput = bindingOperation.getEBindingInput();
		BindingOutput bindingOutput = bindingOperation.getEBindingOutput();
		List bindingFaults = bindingOperation.getEBindingFaults();
		
		Operation operation = bindingOperation.getEOperation();
		Input input = operation.getEInput();
		Output output = operation.getEOutput();
		List faults = operation.getEFaults();

		/******************************************************
		 * Compare the Operation names
		 ******************************************************/		
		if (!namesEqual(bindingOperation.getName(), operation.getName())) {
			bindingOperation.setName(operation.getName());
		}
		
		
		/******************************************************
		 * Compare the Output
		 ******************************************************/
		if (output == null) {
			bindingOperation.setBindingOutput(null);			
		}
		else {
			// Create BindingOutput if necessary
			if (bindingOutput == null) {
				BindingOutput newBindingOutput = factory.createBindingOutput();
				newBindingOutput.setEOutput(output);
				newBindingOutput.setName(output.getName());
				bindingOperation.setBindingOutput(newBindingOutput);				
			}
			else {
				// Compare the Output names
				if (!namesEqual(bindingOutput.getName(), output.getName())) {
					bindingOutput.setName(output.getName());
				}				
			}
		}
		generateBindingOutputContent(bindingOperation.getEBindingOutput());
		
		/******************************************************
		 * Compare the Input
		 ******************************************************/
		if (input == null) {
			bindingOperation.setBindingInput(null);			
		}
		else {
			// Create BindingInput if necessary
			if (bindingInput == null) {
				BindingInput newBindingInput = factory.createBindingInput();
				newBindingInput.setEInput(input);
				newBindingInput.setName(input.getName());
				bindingOperation.setBindingInput(newBindingInput);
			}
			else {
				// Compare the Input names
				if (!namesEqual(bindingInput.getName(), input.getName())) {
					bindingInput.setName(input.getName());
				}
			}
		}
		generateBindingInputContent(bindingOperation.getEBindingInput());
		
		
		/******************************************************
		 * Compare the Faults
		 ******************************************************/
		// Remove any BindingFaults which are no longer used
		for (int index = 0; index < bindingFaults.size(); index++) {
			BindingFault bindingFault = (BindingFault) bindingFaults.get(index);
			
			boolean foundMatch = false;
			Iterator faultsIt = faults.iterator();
			while (faultsIt.hasNext()) {
				Fault fault = (Fault) faultsIt.next();
				if (namesEqual(bindingFault.getName(), fault.getName())) {
					foundMatch = true;
					break;
				}
			}
			
			if (!foundMatch){
				// We need to remove this BindingFault from the bindingFaults List
				bindingFaults.remove(index);
				index--;
			}			
		}
		
		// Remove any Faults which already exists in bindingFaults.  What we
		// have left are the Faults which needs newly created BindingFaults
		List bindingFaultsNeeded = new ArrayList();
		for (int index = 0; index < faults.size(); index++) {
			Fault fault = (Fault) faults.get(index);
			
			boolean foundMatch = false;
			Iterator bindingFaultsIt = bindingFaults.iterator();
			while (bindingFaultsIt.hasNext()) {
				BindingFault bindingFault = (BindingFault) bindingFaultsIt.next();
				if (namesEqual(bindingFault.getName(), fault.getName())) {
					foundMatch = true;
					break;
				}
			}
			
			if (!foundMatch){
				// We need to remove this BindingFault from the bindingFaults List
				bindingFaultsNeeded.add(fault);
			}			
		}		
		
		// bindingFaultsNeeded contains the needed BindingFault's we need to create
		Iterator neededBindingFaultsIt = bindingFaultsNeeded.iterator();
		while (neededBindingFaultsIt.hasNext()) {
			Fault fault = (Fault) neededBindingFaultsIt.next();
			BindingFault newBindingFault = factory.createBindingFault();
			newBindingFault.setEFault(fault);
			newBindingFault.setName(fault.getName());
			bindingOperation.addBindingFault(newBindingFault);
		}
		
		// Create the contents for each BindingFault
		Iterator faultContentIt = bindingOperation.getEBindingFaults().iterator();
		while (faultContentIt.hasNext()) {
			BindingFault bindingFault = (BindingFault) faultContentIt.next();
			generateBindingFaultContent(bindingFault);
		}
		
		generateBindingOperationContent(bindingOperation);
	}
	
	private boolean namesEqual(String name1, String name2) {
		boolean match = false;
		
		if (name1 != null ^ name2 != null) {
			// one is null
			match = false;
		}
		else if (name1 != null && name2 != null) {
			// neither is null
			match = name1.equals(name2);
		}
		else {
			// both are null
			match = true;
		}		
		
		return match;
	}

	protected void generateBindingContent(Binding binding) {
		if (contentGenerator != null) {
			if (getOverwrite() || binding.getEExtensibilityElements().size() == 0) {
				contentGenerator.generateBindingContent(binding, (PortType) binding.getEPortType());
			}
		}
		else {
			removeExtensibilityElements(binding);
		}
	}

	protected void generateBindingOperationContent(BindingOperation bindingOperation) {
		if (bindingOperation != null && contentGenerator != null) {
			contentGenerator.generateBindingOperationContent(bindingOperation, bindingOperation.getEOperation());
		}
		else {
			removeExtensibilityElements(bindingOperation);
		}
	}
	
	protected void generateBindingInputContent(BindingInput bindingInput) {
		if (bindingInput != null && contentGenerator != null) {
			contentGenerator.generateBindingInputContent(bindingInput, bindingInput.getEInput());
		}
		else {
			removeExtensibilityElements(bindingInput);
		}
	}
	
	protected void generateBindingOutputContent(BindingOutput bindingOutput) {
		if (bindingOutput != null && contentGenerator != null) {
			contentGenerator.generateBindingOutputContent(bindingOutput, bindingOutput.getEOutput());
		}
		else {
			removeExtensibilityElements(bindingOutput);
		}
	}

	protected void generateBindingFaultContent(BindingFault bindingFault) {
		if (bindingFault != null && contentGenerator != null) {
			contentGenerator.generateBindingFaultContent(bindingFault, bindingFault.getEFault());
		}
		else {
			removeExtensibilityElements(bindingFault);
		}
	}
	
	private void removeExtensibilityElements(ExtensibleElement ee) {
		if (ee != null) {
			ee.getEExtensibilityElements().clear();
		}
	}
	
	/*
	 * Generate Port Content for all Ports with a reference to the Binding
	 * which was passed in through the constructor (or a reference to the
	 * newly created Binding).
	 */
	public void generatePortContent() {
		if (binding != null && contentGenerator != null) {
			List portsToUpdate = new ArrayList();
			
			Iterator servicesIt = binding.getEnclosingDefinition().getEServices().iterator();
			while (servicesIt.hasNext()) {
				Service service = (Service) servicesIt.next();
				Iterator portsIt = service.getEPorts().iterator();
				while (portsIt.hasNext()) {
					Port port = (Port) portsIt.next();
					if (binding.equals(port.getEBinding())) {
						// Found a match
						portsToUpdate.add(port);
					}
				}
			}
			
			Iterator portsToUpdateIt = portsToUpdate.iterator();
			while (portsToUpdateIt.hasNext()) {
				contentGenerator.generatePortContent((Port) portsToUpdateIt.next());
			}
		}	
	}
	
	/*
	 * methods addRequiredNamespaces() and computeUniquePrefix() are used to add necessary
	 * namespaces 
	 * 
	 * TODO:
	 * Does this belong here?  This is copied from wsdl.ui.  Can we sync up in some way?
	 */
	protected void addRequiredNamespaces(Binding binding) {
		if (contentGenerator != null) {
			String[] namespaceNames = contentGenerator.getRequiredNamespaces();
			String[] preferredPrefixes = new String[namespaceNames.length];
			for (int index = 0; index < namespaceNames.length; index++) {
				preferredPrefixes[index] = contentGenerator.getPreferredNamespacePrefix(namespaceNames[index]);				
			}
	
			Map map = binding.getEnclosingDefinition().getNamespaces();
			
		      for (int i = 0; i < namespaceNames.length; i++) {
		        String namespace = namespaceNames[i];
		        if (!map.containsValue(namespace)) {
		          String prefix = (i < preferredPrefixes.length) ? preferredPrefixes[i] : "p0";
		          if (map.containsKey(prefix)) {
		            prefix = computeUniquePrefix("p", map);
		          }
				  binding.getEnclosingDefinition().addNamespace(prefix, namespace);
		        }
		      }
		}
	}
	
	private String computeUniquePrefix(String base, Map table){
	    int i = 0;
	    String prefix = base;
	    while (true) {
	      if (!table.containsKey(prefix)) {
	        break;
	      }
	      else {
	        prefix = base + i;
	        i++;
	      }
	    }
	    return prefix;
	}
	
	private PortType getPortType() {
		if (getRefName().equals("")) {
			// Means we should set the PortType to Unspecified
			return null;
		}
		
		if (getRefName() != null) {
			Iterator portTypeIt = definition.getEPortTypes().iterator();			

			while (portTypeIt.hasNext()) {
				PortType pt = (PortType) portTypeIt.next();
				List prefixedNames = getPrefixedNames(pt);
				if (prefixedNames.contains(getRefName())) {
					return pt;
				}
			}
		}
		
		return binding.getEPortType();
	}
	
	private List getPrefixedNames(PortType portType) {
		List prefixedNames = new ArrayList();
		String currentPortTypeName = portType.getQName().getLocalPart();
		String currentNamespace = portType.getQName().getNamespaceURI();

		Map namespaceMap = definition.getNamespaces();
		Iterator keys = namespaceMap.keySet().iterator();
		while (keys.hasNext()) {
			Object key = keys.next();
			Object value = namespaceMap.get(key);

			if (currentNamespace.equals(value)) {
				// Found a match.  Add to our list
				prefixedNames.add(key + ":" + currentPortTypeName);
			}
		}
		
		return prefixedNames;
		
	}
}