/*
 * Copyright © 2010 Reinier Zwitserloot, Roel Spilker and Robbert Jan Grootjans.
 * 
 * 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.Eclipse.fromQualifiedName;
import static lombok.eclipse.handlers.EclipseHandlerUtil.*;

import java.lang.reflect.Modifier;
import java.util.Arrays;

import lombok.core.AnnotationValues;
import lombok.eclipse.Eclipse;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseNode;
import lombok.eclipse.handlers.EclipseHandlerUtil.MemberExistsResult;

import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.ClassLiteralAccess;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.mangosdk.spi.ProviderFor;

public class HandleLog {
	private HandleLog() {
		throw new UnsupportedOperationException();
	}
	
	public static void processAnnotation(LoggingFramework framework, AnnotationValues<? extends java.lang.annotation.Annotation> annotation, Annotation source, EclipseNode annotationNode) {
		EclipseNode owner = annotationNode.up();
		switch (owner.getKind()) {
		case TYPE:
			TypeDeclaration typeDecl = null;
			if (owner.get() instanceof TypeDeclaration) typeDecl = (TypeDeclaration) owner.get();
			int modifiers = typeDecl == null ? 0 : typeDecl.modifiers;
			
			boolean notAClass = (modifiers &
					(ClassFileConstants.AccInterface | ClassFileConstants.AccAnnotation)) != 0;
			
			if (typeDecl == null || notAClass) {
				annotationNode.addError("@Log is legal only on classes and enums.");
				return;
			}
			
			if (fieldExists("log", owner) != MemberExistsResult.NOT_EXISTS) {
				annotationNode.addWarning("Field 'log' already exists.");
				return;
			}
			
			ClassLiteralAccess loggingType = selfType(owner, source);
			
			injectField(owner, createField(framework, source, loggingType));
			owner.rebuild();
			break;
		default:
			annotationNode.addError("@Log is legal only on types.");
			break;
		}
	}
	
	private static ClassLiteralAccess selfType(EclipseNode type, Annotation source) {
		int pS = source.sourceStart, pE = source.sourceEnd;
		long p = (long)pS << 32 | pE;

		TypeDeclaration typeDeclaration = (TypeDeclaration)type.get();
		TypeReference typeReference = new SingleTypeReference(typeDeclaration.name, p);
		Eclipse.setGeneratedBy(typeReference, source);

		ClassLiteralAccess result = new ClassLiteralAccess(source.sourceEnd, typeReference);
		Eclipse.setGeneratedBy(result, source);
		
		return result;
	}
	
	private static FieldDeclaration createField(LoggingFramework framework, Annotation source, ClassLiteralAccess loggingType) {
		int pS = source.sourceStart, pE = source.sourceEnd;
		long p = (long)pS << 32 | pE;
		
		// 	private static final <loggerType> log = <factoryMethod>(<parameter>);

		FieldDeclaration fieldDecl = new FieldDeclaration("log".toCharArray(), 0, -1);
		Eclipse.setGeneratedBy(fieldDecl, source);
		fieldDecl.declarationSourceEnd = -1;
		fieldDecl.modifiers = Modifier.PRIVATE | Modifier.STATIC | Modifier.FINAL;
		
		fieldDecl.type = createTypeReference(framework.getLoggerTypeName(), source);
		
		MessageSend factoryMethodCall = new MessageSend();
		Eclipse.setGeneratedBy(factoryMethodCall, source);

		factoryMethodCall.receiver = createNameReference(framework.getLoggerFactoryTypeName(), source);
		factoryMethodCall.selector = framework.getLoggerFactoryMethodName().toCharArray();
		
		Expression parameter = framework.createFactoryParameter(loggingType, source);
		
		factoryMethodCall.arguments = new Expression[] { parameter };
		factoryMethodCall.nameSourcePosition = p;
		factoryMethodCall.sourceStart = pS;
		factoryMethodCall.sourceEnd = factoryMethodCall.statementEnd = pE;
		
		fieldDecl.initialization = factoryMethodCall;
		
		return fieldDecl;
	}
	
	private static TypeReference createTypeReference(String typeName, Annotation source) {
		int pS = source.sourceStart, pE = source.sourceEnd;
		long p = (long)pS << 32 | pE;
		
		TypeReference typeReference;
		if (typeName.contains(".")) {
			
			char[][] typeNameTokens = fromQualifiedName(typeName);
			long[] pos = new long[typeNameTokens.length];
			Arrays.fill(pos, p);
			
			typeReference = new QualifiedTypeReference(typeNameTokens, pos);
		}
		else {
			typeReference = null;
		}
		
		Eclipse.setGeneratedBy(typeReference, source);
		return typeReference;
	}
	
	/**
	 * Handles the {@link lombok.extern.apachecommons.CommonsLog} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleCommonsLog implements EclipseAnnotationHandler<lombok.extern.apachecommons.CommonsLog> {
		@Override public boolean deferUntilPostDiet() {
			return false;
		}
		
		@Override public void handle(AnnotationValues<lombok.extern.apachecommons.CommonsLog> annotation, Annotation source, EclipseNode annotationNode) {
			processAnnotation(LoggingFramework.COMMONS, annotation, source, annotationNode);
		}
	}
	
	/**
	 * Handles the {@link lombok.extern.java.Log} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleJulLog implements EclipseAnnotationHandler<lombok.extern.java.Log> {
		@Override public boolean deferUntilPostDiet() {
			return false;
		}
		
		@Override public void handle(AnnotationValues<lombok.extern.java.Log> annotation, Annotation source, EclipseNode annotationNode) {
			processAnnotation(LoggingFramework.JUL, annotation, source, annotationNode);
		}
	}
	
	/**
	 * Handles the {@link lombok.extern.log4j.Log4j} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleLog4jLog implements EclipseAnnotationHandler<lombok.extern.log4j.Log4j> {
		@Override public boolean deferUntilPostDiet() {
			return false;
		}
		
		@Override public void handle(AnnotationValues<lombok.extern.log4j.Log4j> annotation, Annotation source, EclipseNode annotationNode) {
			processAnnotation(LoggingFramework.LOG4J, annotation, source, annotationNode);
		}
	}
	
	/**
	 * Handles the {@link lombok.extern.slf4j.Slf4j} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleSlf4jLog implements EclipseAnnotationHandler<lombok.extern.slf4j.Slf4j> {
		@Override public boolean deferUntilPostDiet() {
			return false;
		}
		
		@Override public void handle(AnnotationValues<lombok.extern.slf4j.Slf4j> annotation, Annotation source, EclipseNode annotationNode) {
			processAnnotation(LoggingFramework.SLF4J, annotation, source, annotationNode);
		}
	}
	
	enum LoggingFramework {
		// private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(TargetType.class);
		COMMONS("org.apache.commons.logging.Log", "org.apache.commons.logging.LogFactory", "getLog"),
		
		// private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(TargetType.class.getName());
		JUL("java.util.logging.Logger", "java.util.logging.Logger", "getLogger") {
			@Override public Expression createFactoryParameter(ClassLiteralAccess type, Annotation source) {
				int pS = source.sourceStart, pE = source.sourceEnd;
				long p = (long)pS << 32 | pE;
				
				MessageSend factoryParameterCall = new MessageSend();
				Eclipse.setGeneratedBy(factoryParameterCall, source);
				
				factoryParameterCall.receiver = super.createFactoryParameter(type, source);
				factoryParameterCall.selector = "getName".toCharArray();
				
				factoryParameterCall.nameSourcePosition = p;
				factoryParameterCall.sourceStart = pS;
				factoryParameterCall.sourceEnd = factoryParameterCall.statementEnd = pE;
				
				return factoryParameterCall;
			}
		},
		
		// private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(TargetType.class);
		LOG4J("org.apache.log4j.Logger", "org.apache.log4j.Logger", "getLogger"),

		// private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(TargetType.class);
		SLF4J("org.slf4j.Logger", "org.slf4j.LoggerFactory", "getLogger"),
		
		;
		
		private final String loggerTypeName;
		private final String loggerFactoryTypeName;
		private final String loggerFactoryMethodName;

		LoggingFramework(String loggerTypeName, String loggerFactoryTypeName, String loggerFactoryMethodName) {
			this.loggerTypeName = loggerTypeName;
			this.loggerFactoryTypeName = loggerFactoryTypeName;
			this.loggerFactoryMethodName = loggerFactoryMethodName;
		}
		
		final String getLoggerTypeName() {
			return loggerTypeName;
		}
		
		final String getLoggerFactoryTypeName() {
			return loggerFactoryTypeName;
		}
		
		final String getLoggerFactoryMethodName() {
			return loggerFactoryMethodName;
		}
		
		Expression createFactoryParameter(ClassLiteralAccess loggingType, Annotation source){
			TypeReference copy = Eclipse.copyType(loggingType.type, source);
			ClassLiteralAccess result = new ClassLiteralAccess(source.sourceEnd, copy);
			Eclipse.setGeneratedBy(result, source);
			return result;
		};
	}
}