/*
 * Copyright © 2009-2010 Reinier Zwitserloot and Roel Spilker.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package lombok.eclipse.handlers;

import static lombok.eclipse.handlers.EclipseHandlerUtil.findAnnotations;

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

import lombok.AccessLevel;
import lombok.Data;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.core.handlers.TransformationsUtil;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseNode;

import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.mangosdk.spi.ProviderFor;

/**
 * Handles the {@code lombok.Data} annotation for eclipse.
 */
@ProviderFor(EclipseAnnotationHandler.class)
public class HandleData implements EclipseAnnotationHandler<Data> {
	public boolean handle(AnnotationValues<Data> annotation, Annotation ast, EclipseNode annotationNode) {
		Data ann = annotation.getInstance();
		EclipseNode typeNode = annotationNode.up();
		
		TypeDeclaration typeDecl = null;
		if (typeNode.get() instanceof TypeDeclaration) typeDecl = (TypeDeclaration) typeNode.get();
		int modifiers = typeDecl == null ? 0 : typeDecl.modifiers;
		boolean notAClass = (modifiers &
				(ClassFileConstants.AccInterface | ClassFileConstants.AccAnnotation | ClassFileConstants.AccEnum)) != 0;
		
		if (typeDecl == null || notAClass) {
			annotationNode.addError("@Data is only supported on a class.");
			return false;
		}
		
		List<EclipseNode> nodesForConstructor = new ArrayList<EclipseNode>();
		Map<EclipseNode, Boolean> gettersAndSetters = new LinkedHashMap<EclipseNode, Boolean>();
		for (EclipseNode child : typeNode.down()) {
			if (child.getKind() != Kind.FIELD) continue;
			FieldDeclaration fieldDecl = (FieldDeclaration) child.get();
			//Skip fields that start with $
			if (fieldDecl.name.length > 0 && fieldDecl.name[0] == '$') continue;
			//Skip static fields.
			if ((fieldDecl.modifiers & ClassFileConstants.AccStatic) != 0) continue;
			boolean isFinal = (fieldDecl.modifiers & ClassFileConstants.AccFinal) != 0;
			boolean isNonNull = findAnnotations(fieldDecl, TransformationsUtil.NON_NULL_PATTERN).length != 0;
			if ((isFinal || isNonNull) && fieldDecl.initialization == null) nodesForConstructor.add(child);
			gettersAndSetters.put(child, !isFinal);
		}
		
		//Careful: Generate the public static constructor (if there is one) LAST, so that any attempt to
		//'find callers' on the annotation node will find callers of the constructor, which is by far the
		//most useful of the many methods built by @Data. This trick won't work for the non-static constructor,
		//for whatever reason, though you can find callers of that one by focusing on the class name itself
		//and hitting 'find callers'.
		
		new HandleConstructor().generateConstructor(AccessLevel.PUBLIC, typeNode, nodesForConstructor, ann.staticConstructor(), true, false, ast);
		
		for (Map.Entry<EclipseNode, Boolean> field : gettersAndSetters.entrySet()) {
			new HandleGetter().generateGetterForField(field.getKey(), annotationNode.get(), AccessLevel.PUBLIC, true);
			if (field.getValue()) new HandleSetter().generateSetterForField(field.getKey(), annotationNode.get(), AccessLevel.PUBLIC, true);
		}
		
		new HandleEqualsAndHashCode().generateEqualsAndHashCodeForType(typeNode, annotationNode);
		new HandleToString().generateToStringForType(typeNode, annotationNode);
				
		return false;
	}
}