/*******************************************************************************
 * Copyright (c) 2007 Intel Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Intel Corporation - Initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.managedbuilder.internal.buildproperties;

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

import org.eclipse.cdt.managedbuilder.buildproperties.IBuildProperty;
import org.eclipse.cdt.managedbuilder.buildproperties.IBuildPropertyManager;
import org.eclipse.cdt.managedbuilder.buildproperties.IBuildPropertyType;
import org.eclipse.cdt.managedbuilder.buildproperties.IBuildPropertyValue;
import org.eclipse.cdt.managedbuilder.core.ManagedBuilderCorePlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;

public class BuildPropertyManager implements IBuildPropertyManager{
	private static final String PROPERTIES_EXT_POINT_ID = "org.eclipse.cdt.managedbuilder.core.buildProperties"; //$NON-NLS-1$
	static final String PROPERTY_VALUE_SEPARATOR = "=";   //$NON-NLS-1$
	static final String PROPERTIES_SEPARATOR = ","; //$NON-NLS-1$
	static final String ELEMENT_PROPERTY_TYPE = "propertyType"; //$NON-NLS-1$
	static final String ELEMENT_PROPERTY_VALUE = "propertyValue"; //$NON-NLS-1$
	static final String ATTRIBUTE_PROPERTY = "property"; //$NON-NLS-1$
	static final String ATTRIBUTE_NAME = "name"; //$NON-NLS-1$
	static final String ATTRIBUTE_ID = "id"; //$NON-NLS-1$

	private static BuildPropertyManager fInstance;

	private List<IConfigurationElement> fTypeCfgElements;
	private List<IConfigurationElement> fValueCfgElements;

	private BuildPropertyManager(){
		loadExtensions();
	}

	public static BuildPropertyManager getInstance(){
		if(fInstance == null)
			fInstance = new BuildPropertyManager();
		return fInstance;
	}

	public BuildProperties loadPropertiesFromString(String properties){
		return new BuildProperties(properties);
	}

	public String savePropertiesToString(BuildProperties properties){
		return properties.toString();
	}

	private Map<String, IBuildPropertyType> fPropertyTypeMap = new HashMap<String, IBuildPropertyType>();

	@Override
	public IBuildPropertyType getPropertyType(String id){
		return fPropertyTypeMap.get(id);
	}

	public IBuildPropertyType createPropertyType(String id, String name) throws CoreException{
		IBuildPropertyType type = getPropertyType(id);
		if(type != null){
			if(!name.equals(type.getName()))
				throw new CoreException(new Status(IStatus.ERROR,
						ManagedBuilderCorePlugin.getUniqueIdentifier(),
						BuildPropertiesMessages.getString("BuildPropertyManager.8"))); //$NON-NLS-1$
		} else {
			type = new BuildPropertyType(id, name);
			fPropertyTypeMap.put(id, type);
		}
		return type;
	}

	public IBuildPropertyValue createPropertyValue(String typeId, String id, String name) throws CoreException{
		IBuildPropertyType type = getPropertyType(typeId);
		if(type == null)
			throw new CoreException(new Status(
					IStatus.ERROR,
					ManagedBuilderCorePlugin.getUniqueIdentifier(),
					BuildPropertiesMessages.getString("BuildPropertyManager.9"))); //$NON-NLS-1$

		return createPropertyValue(type, id, name);
	}

	public IBuildPropertyValue createPropertyValue(IBuildPropertyType type, String id, String name) throws CoreException{
		BuildPropertyValue value = (BuildPropertyValue)type.getSupportedValue(id);
		if(value != null){
			if(!name.equals(value.getName()))
				throw new CoreException(new Status(IStatus.ERROR,
						ManagedBuilderCorePlugin.getUniqueIdentifier(),
						BuildPropertiesMessages.getString("BuildPropertyManager.10"))); //$NON-NLS-1$
		} else {
			value = new BuildPropertyValue(id, name);
			((BuildPropertyType)type).addSupportedValue(value);
		}

		return value;
	}

	@Override
	public IBuildPropertyType[] getPropertyTypes(){
		return fPropertyTypeMap.values().toArray(new BuildPropertyType[fPropertyTypeMap.size()]);
	}

	public IBuildProperty createProperty(String id, String value) throws CoreException {
		IBuildPropertyType type = getPropertyType(id);
		if(type == null)
			throw new CoreException(new Status(
					IStatus.ERROR,
					ManagedBuilderCorePlugin.getUniqueIdentifier(),
					BuildPropertiesMessages.getString("BuildPropertyManager.11"))); //$NON-NLS-1$

		BuildProperty property = new BuildProperty(type, value);
		return property;
	}

	private boolean addConfigElement(IConfigurationElement el){
		if(ELEMENT_PROPERTY_TYPE.equals(el.getName())){
			getTypeElList(true).add(el);
			return true;
		} else if(ELEMENT_PROPERTY_VALUE.equals(el.getName())){
			getValueElList(true).add(el);
			return true;
		}
		return false;
	}

	private List<IConfigurationElement> getTypeElList(boolean create){
		if(fTypeCfgElements == null && create)
			fTypeCfgElements = new ArrayList<IConfigurationElement>();
		return fTypeCfgElements;
	}

	private List<IConfigurationElement> getValueElList(boolean create){
		if(fValueCfgElements == null && create)
			fValueCfgElements = new ArrayList<IConfigurationElement>();
		return fValueCfgElements;
	}

	private void loadExtensions(){
		IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(PROPERTIES_EXT_POINT_ID);
		if( extensionPoint != null) {
			IExtension[] extensions = extensionPoint.getExtensions();
			for (int i = 0; i < extensions.length; ++i) {
				IExtension extension = extensions[i];
				IConfigurationElement els[] = extension.getConfigurationElements();
				for(int k = 0; k < els.length; k++){
					addConfigElement(els[k]);
				}
			}

			resolveConfigElements();
		}
	}


	private void resolveConfigElements(){
		List<IConfigurationElement> typeEls = getTypeElList(false);
		if(typeEls != null){
			for (IConfigurationElement el : typeEls) {
				try {
					createPropertyType(el);
				} catch (CoreException e) {
				}
			}
		}

		List<IConfigurationElement> valEls = getValueElList(false);
		if(valEls != null){
			for (IConfigurationElement el : valEls) {
				try {
					createPropertyValue(el);
				} catch (CoreException e) {
				}
			}
		}

	}

	private IBuildPropertyType createPropertyType(IConfigurationElement el) throws CoreException{
		String id = el.getAttribute(ATTRIBUTE_ID);
		if(id == null)
			throw new CoreException(new Status(IStatus.ERROR,
					ManagedBuilderCorePlugin.getUniqueIdentifier(),
					BuildPropertiesMessages.getString("BuildPropertyManager.12"))); //$NON-NLS-1$
		String name = el.getAttribute(ATTRIBUTE_NAME);
		if(name == null)
			throw new CoreException(new Status(IStatus.ERROR,
					ManagedBuilderCorePlugin.getUniqueIdentifier(),
					BuildPropertiesMessages.getString("BuildPropertyManager.13"))); //$NON-NLS-1$

		return createPropertyType(id, name);
	}

	private IBuildPropertyValue createPropertyValue(IConfigurationElement el) throws CoreException{
		String id = el.getAttribute(ATTRIBUTE_ID);
		if(id == null)
			throw new CoreException(new Status(IStatus.ERROR,
					ManagedBuilderCorePlugin.getUniqueIdentifier(),
					BuildPropertiesMessages.getString("BuildPropertyManager.14"))); //$NON-NLS-1$
		String name = el.getAttribute(ATTRIBUTE_NAME);
		if(name == null)
			throw new CoreException(new Status(IStatus.ERROR,
					ManagedBuilderCorePlugin.getUniqueIdentifier(),
					BuildPropertiesMessages.getString("BuildPropertyManager.15"))); //$NON-NLS-1$
		String property = el.getAttribute(ATTRIBUTE_PROPERTY);
		if(property == null)
			throw new CoreException(new Status(IStatus.ERROR,
					ManagedBuilderCorePlugin.getUniqueIdentifier(),
					BuildPropertiesMessages.getString("BuildPropertyManager.16"))); //$NON-NLS-1$


		return createPropertyValue(property, id, name);
	}
}
