/*******************************************************************************
 * Copyright (c) 2005, 2010 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.core.internal.utility.jdt;

import java.util.List;

import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.AbstractTypeDeclaration;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.FieldDeclaration;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.TypeDeclaration;
import org.eclipse.jpt.core.utility.TextRange;
import org.eclipse.jpt.core.utility.jdt.AnnotationEditFormatter;
import org.eclipse.jpt.core.utility.jdt.Type;
import org.eclipse.jpt.utility.CommandExecutor;

/**
 * Adapt and extend a JDT type.
 */
public class JDTType
	extends JDTMember
	implements Type
{

	/**
	 * constructor for the compilation unit's primary type
	 */
	public JDTType(
			TypeDeclaration typeDeclaration,  // exclude annotations and enums
			ICompilationUnit compilationUnit,
			CommandExecutor modifySharedDocumentCommandExecutor) {
		this(typeDeclaration, compilationUnit, modifySharedDocumentCommandExecutor, DefaultAnnotationEditFormatter.instance());
	}

	/**
	 * constructor for the compilation unit's primary type
	 */
	public JDTType(
			TypeDeclaration typeDeclaration,  // exclude annotations and enums
			ICompilationUnit compilationUnit,
			CommandExecutor modifySharedDocumentCommandExecutor,
			AnnotationEditFormatter annotationEditFormatter) {
		this(null, typeDeclaration, 1, compilationUnit, modifySharedDocumentCommandExecutor, annotationEditFormatter);
	}

	/**
	 * constructor for nested types
	 */
	public JDTType(
			Type declaringType,
			TypeDeclaration typeDeclaration,  // exclude annotations and enums
			int occurrence,
			ICompilationUnit compilationUnit,
			CommandExecutor modifySharedDocumentCommandExecutor) {
		this(declaringType, typeDeclaration, occurrence, compilationUnit, modifySharedDocumentCommandExecutor, DefaultAnnotationEditFormatter.instance());
	}

	/**
	 * constructor for nested types
	 */
	public JDTType(
			Type declaringType,
			TypeDeclaration typeDeclaration,  // exclude annotations and enums
			int occurrence,
			ICompilationUnit compilationUnit,
			CommandExecutor modifySharedDocumentCommandExecutor,
			AnnotationEditFormatter annotationEditFormatter) {
		super(declaringType, typeDeclaration.getName().getFullyQualifiedName(), occurrence, compilationUnit, modifySharedDocumentCommandExecutor, annotationEditFormatter);
	}

	/**
	 * constructor for testing
	 */
	public JDTType(Type declaringType, String name, int occurrence, ICompilationUnit compilationUnit) {
		super(declaringType, name, occurrence, compilationUnit, CommandExecutor.Default.instance(), DefaultAnnotationEditFormatter.instance());
	}


	// ********** Member/Type implementation **********

	public ITypeBinding getBinding(CompilationUnit astRoot) {
		TypeDeclaration td = this.getBodyDeclaration(astRoot);
		return (td == null) ? null : td.resolveBinding();
	}

	/**
	 * find the type's body declaration in the specified AST
	 */
	public TypeDeclaration getBodyDeclaration(CompilationUnit astRoot) {
		Type declaringType = this.getDeclaringType();
		if (declaringType == null) {
			return this.getTopLevelTypeDeclaration(astRoot);
		}
		TypeDeclaration typeDeclaration = declaringType.getBodyDeclaration(astRoot);
		// the type declaration can be null when the source is completely hosed
		return (typeDeclaration == null) ? null : this.getNestedTypeDeclaration(typeDeclaration);
	}

	public boolean isPersistable(CompilationUnit astRoot) {
		ITypeBinding binding = this.getBinding(astRoot);
		return (binding == null) ? false : JPTTools.typeIsPersistable(new JPTToolsAdapter(binding));
	}

	public TextRange getNameTextRange(CompilationUnit astRoot) {
		return new ASTNodeTextRange(this.getBodyDeclaration(astRoot).getName());
	}

	public TypeDeclaration[] getTypes(CompilationUnit astRoot) {
		return this.getBodyDeclaration(astRoot).getTypes();
	}

	public FieldDeclaration[] getFields(CompilationUnit astRoot) {
		return this.getBodyDeclaration(astRoot).getFields();
	}

	public MethodDeclaration[] getMethods(CompilationUnit astRoot) {
		return this.getBodyDeclaration(astRoot).getMethods();
	}


	// ********** internal **********

	/**
	 * return the first top-level type in the specified AST with a matching name
	 */
	protected TypeDeclaration getTopLevelTypeDeclaration(CompilationUnit astRoot) {
		return this.getTypeDeclaration(types(astRoot));
	}

	protected TypeDeclaration getTypeDeclaration(List<AbstractTypeDeclaration> typeDeclarations) {
		return this.getTypeDeclaration(typeDeclarations.toArray(new AbstractTypeDeclaration[typeDeclarations.size()]));
	}

	/**
	 * return the nested type with a matching name and occurrence
	 */
	protected TypeDeclaration getNestedTypeDeclaration(TypeDeclaration declaringTypeDeclaration) {
		return this.getTypeDeclaration(declaringTypeDeclaration.getTypes());
	}

	/**
	 * return the type declaration corresponding to the type from the specified
	 * set of type declarations (match name and occurrence)
	 */
	protected TypeDeclaration getTypeDeclaration(AbstractTypeDeclaration[] typeDeclarations) {
		String name = this.getName_();
		int occurrence = this.getOccurrence();
		int count = 0;
		for (AbstractTypeDeclaration typeDeclaration : typeDeclarations) {
			if (typeDeclaration.getName().getFullyQualifiedName().equals(name)) {
				count++;
				if (count == occurrence) {
					return (typeDeclaration.getNodeType() == ASTNode.TYPE_DECLARATION) ? (TypeDeclaration) typeDeclaration : null;
				}
			}
		}
		// return null if the type is no longer in the source code;
		// this can happen when the context model has not yet
		// been synchronized with the resource model but is still
		// asking for an ASTNode (e.g. during a selection event)
		return null;
	}

	/**
	 * we only instantiate a single top-level, non-enum, non-annotation
	 * type per compilation unit (i.e. a class or interface); and, since
	 * enums and annotations can only be top-level types (i.e. they cannot
	 * be nested within another type) we will always have TypeDeclarations
	 * in the CompilationUnit
	 */
	// minimize scope of suppressed warnings
	@SuppressWarnings("unchecked")
	protected static List<AbstractTypeDeclaration> types(CompilationUnit astRoot) {
		return astRoot.types();
	}


	// ********** JPT tools adapter **********

	protected static class JPTToolsAdapter implements JPTTools.TypeAdapter {
		private final ITypeBinding typeBinding;
		protected JPTToolsAdapter(ITypeBinding typeBinding) {
			super();
			if (typeBinding == null) {
				throw new NullPointerException();
			}
			this.typeBinding = typeBinding;
		}

		public int getModifiers() {
			return this.typeBinding.getModifiers();
		}

		public boolean isAnnotation() {
			return this.typeBinding.isAnnotation();
		}

		public boolean isAnonymous() {
			return this.typeBinding.isAnonymous();
		}

		public boolean isArray() {
			return this.typeBinding.isArray();
		}

		public boolean isEnum() {
			return this.typeBinding.isEnum();
		}

		public boolean isInterface() {
			return this.typeBinding.isInterface();
		}

		public boolean isLocal() {
			return this.typeBinding.isLocal();
		}

		public boolean isMember() {
			return this.typeBinding.isMember();
		}

		public boolean isPrimitive() {
			return this.typeBinding.isPrimitive();
		}
	
	}

}