/*
 * Copyright (C) 2009-2012 The Project Lombok Authors.
 * 
 * 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.javac;

import java.util.ArrayList;
import java.util.SortedSet;

import javax.annotation.processing.Messager;

import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.List;

public class JavacTransformer {
	private final HandlerLibrary handlers;
	private final Messager messager;
	
	public JavacTransformer(Messager messager) {
		this.messager = messager;
		this.handlers = HandlerLibrary.load(messager);
	}
	
	public SortedSet<Long> getPriorities() {
		return handlers.getPriorities();
	}
	
	public SortedSet<Long> getPrioritiesRequiringResolutionReset() {
		return handlers.getPrioritiesRequiringResolutionReset();
	}
	
	public void transform(long priority, Context context, java.util.List<JCCompilationUnit> compilationUnitsRaw) {
		List<JCCompilationUnit> compilationUnits;
		if (compilationUnitsRaw instanceof List<?>) {
			compilationUnits = (List<JCCompilationUnit>)compilationUnitsRaw;
		} else {
			compilationUnits = List.nil();
			for (int i = compilationUnitsRaw.size() -1; i >= 0; i--) {
				compilationUnits = compilationUnits.prepend(compilationUnitsRaw.get(i));
			}
		}
		
		java.util.List<JavacAST> asts = new ArrayList<JavacAST>();
		
		for (JCCompilationUnit unit : compilationUnits) asts.add(new JavacAST(messager, context, unit));
		
		for (JavacAST ast : asts) {
			ast.traverse(new AnnotationVisitor(priority));
			handlers.callASTVisitors(ast, priority);
		}
		
		for (JavacAST ast : asts) if (ast.isChanged()) LombokOptions.markChanged(context, (JCCompilationUnit) ast.top().get());
	}
	
	private class AnnotationVisitor extends JavacASTAdapter {
		private final long priority;
		
		AnnotationVisitor(long priority) {
			this.priority = priority;
		}
		
		@Override public void visitAnnotationOnType(JCClassDecl type, JavacNode annotationNode, JCAnnotation annotation) {
			JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
			handlers.handleAnnotation(top, annotationNode, annotation, priority);
		}
		
		@Override public void visitAnnotationOnField(JCVariableDecl field, JavacNode annotationNode, JCAnnotation annotation) {
			JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
			handlers.handleAnnotation(top, annotationNode, annotation, priority);
		}
		
		@Override public void visitAnnotationOnMethod(JCMethodDecl method, JavacNode annotationNode, JCAnnotation annotation) {
			JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
			handlers.handleAnnotation(top, annotationNode, annotation, priority);
		}
		
		@Override public void visitAnnotationOnMethodArgument(JCVariableDecl argument, JCMethodDecl method, JavacNode annotationNode, JCAnnotation annotation) {
			JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
			handlers.handleAnnotation(top, annotationNode, annotation, priority);
		}
		
		@Override public void visitAnnotationOnLocal(JCVariableDecl local, JavacNode annotationNode, JCAnnotation annotation) {
			JCCompilationUnit top = (JCCompilationUnit) annotationNode.top().get();
			handlers.handleAnnotation(top, annotationNode, annotation, priority);
		}
	}
}
