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/**

* Copyright (C) 2010-2011 eBusiness Information, Excilys Group

*

* Licensed under the Apache License, Version 2.0 (the "License"); you may not

* use this file except in compliance with the License. You may obtain a copy of

* the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed To in writing, software

* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

* License for the specific language governing permissions and limitations under

* the License.

*/

package com.googlecode.androidannotations.processing;

import static com.sun.codemodel.JExpr._null;

import static com.sun.codemodel.JExpr.ref;

import static com.sun.codemodel.JMod.PRIVATE;

import static com.sun.codemodel.JMod.PUBLIC;

import java.lang.annotation.Annotation;

import java.util.HashMap;

import java.util.Map;

import javax.annotation.processing.ProcessingEnvironment;

import javax.lang.model.element.Element;

import javax.lang.model.element.TypeElement;

import javax.lang.model.type.ArrayType;

import javax.lang.model.type.DeclaredType;

import javax.lang.model.type.TypeKind;

import javax.lang.model.type.TypeMirror;

import com.googlecode.androidannotations.annotations.InstanceState;

import com.googlecode.androidannotations.helper.APTCodeModelHelper;

import com.googlecode.androidannotations.helper.AnnotationHelper;

import com.sun.codemodel.JBlock;

import com.sun.codemodel.JClass;

import com.sun.codemodel.JCodeModel;

import com.sun.codemodel.JExpr;

import com.sun.codemodel.JExpression;

import com.sun.codemodel.JFieldRef;

import com.sun.codemodel.JInvocation;

import com.sun.codemodel.JMethod;

import com.sun.codemodel.JVar;

public class InstanceStateProcessor implements ElementProcessor {

private static final String BUNDLE_PARAM_NAME = "bundle";

public static final Map<String, String> methodSuffixNameByTypeName = new HashMap<String, String>();

static {

methodSuffixNameByTypeName.put("android.os.Bundle", "Bundle");

methodSuffixNameByTypeName.put("boolean", "Boolean");

methodSuffixNameByTypeName.put("boolean[]", "BooleanArray");

methodSuffixNameByTypeName.put("byte", "Byte");

methodSuffixNameByTypeName.put("byte[]", "ByteArray");

methodSuffixNameByTypeName.put("char", "Char");

methodSuffixNameByTypeName.put("char[]", "CharArray");

methodSuffixNameByTypeName.put("java.lang.CharSequence", "CharSequence");

methodSuffixNameByTypeName.put("double", "Double");

methodSuffixNameByTypeName.put("double[]", "DoubleArray");

methodSuffixNameByTypeName.put("float", "Float");

methodSuffixNameByTypeName.put("float[]", "FloatArray");

methodSuffixNameByTypeName.put("int", "Int");

methodSuffixNameByTypeName.put("int[]", "IntArray");

methodSuffixNameByTypeName.put("java.util.ArrayList<java.lang.Integer>", "IntegerArrayList");

methodSuffixNameByTypeName.put("long", "Long");

methodSuffixNameByTypeName.put("long[]", "LongArray");

methodSuffixNameByTypeName.put("short", "Short");

methodSuffixNameByTypeName.put("short[]", "ShortArray");

methodSuffixNameByTypeName.put("java.lang.String", "String");

methodSuffixNameByTypeName.put("java.lang.String[]", "StringArray");

methodSuffixNameByTypeName.put("java.util.ArrayList<java.lang.String>", "StringArrayList");

}

private final APTCodeModelHelper helper = new APTCodeModelHelper();

private AnnotationHelper annotationHelper;

public InstanceStateProcessor(ProcessingEnvironment processingEnv) {

annotationHelper = new AnnotationHelper(processingEnv);

}

@Override

public Class<? extends Annotation> getTarget() {

return InstanceState.class;

}

@Override

public void process(Element element, JCodeModel codeModel, EBeansHolder activitiesHolder) {

EBeanHolder holder = activitiesHolder.getEnclosingEBeanHolder(element);

String fieldName = element.getSimpleName().toString();

JBlock saveStateBody = getSaveStateMethodBody(codeModel, holder);

JBlock restoreStateBody = getRestoreStateBody(codeModel, holder);

String typeString = element.asType().toString();

TypeElement elementType = annotationHelper.typeElementFromQualifiedName(typeString);

String methodNameToSave;

String methodNameToRestore;

boolean restoreCallNeedCastStatement = false;

boolean restoreCallNeedsSuppressWarning = false;

if (methodSuffixNameByTypeName.containsKey(typeString)) {

methodNameToSave = "put" + methodSuffixNameByTypeName.get(typeString);

methodNameToRestore = "get" + methodSuffixNameByTypeName.get(typeString);

} else if (element.asType().getKind() == TypeKind.ARRAY) {

ArrayType arrayType = (ArrayType) element.asType();

boolean hasTypeArguments = false;

if (arrayType.getComponentType() instanceof DeclaredType) {

DeclaredType declaredType = (DeclaredType) arrayType.getComponentType();

typeString = declaredType.asElement().toString();

hasTypeArguments = declaredType.getTypeArguments().size() > 0;

} else {

typeString = arrayType.getComponentType().toString();

}

elementType = annotationHelper.typeElementFromQualifiedName(typeString);

if (isTypeParcelable(elementType)) {

methodNameToSave = "put" + "ParcelableArray";

methodNameToRestore = "get" + "ParcelableArray";

restoreCallNeedCastStatement = true;

if (hasTypeArguments) {

restoreCallNeedsSuppressWarning = true;

}

} else {

methodNameToSave = "put" + "Serializable";

methodNameToRestore = "get" + "Serializable";

restoreCallNeedCastStatement = true;

}

} else {

TypeMirror elementAsType = element.asType();

boolean hasTypeArguments = false;

if (elementAsType instanceof DeclaredType) {

DeclaredType declaredType = (DeclaredType) elementAsType;

typeString = declaredType.asElement().toString();

elementType = annotationHelper.typeElementFromQualifiedName(typeString);

hasTypeArguments = declaredType.getTypeArguments().size() > 0;

}

if (isTypeParcelable(elementType)) {

methodNameToSave = "put" + "Parcelable";

methodNameToRestore = "get" + "Parcelable";

} else {

methodNameToSave = "put" + "Serializable";

methodNameToRestore = "get" + "Serializable";

restoreCallNeedCastStatement = true;

if (hasTypeArguments) {

restoreCallNeedsSuppressWarning = true;

}

}

}

JFieldRef ref = JExpr.ref(fieldName);

saveStateBody.invoke(JExpr.ref(BUNDLE_PARAM_NAME), methodNameToSave).arg(fieldName).arg(ref);

JInvocation restoreMethodCall = JExpr.invoke(ref("savedInstanceState"), methodNameToRestore).arg(fieldName);

if (restoreCallNeedCastStatement) {

JClass jclass = helper.typeMirrorToJClass(element.asType(), holder);

JExpression castStatement = JExpr.cast(jclass, restoreMethodCall);

restoreStateBody.assign(ref, castStatement);

if (restoreCallNeedsSuppressWarning) {

if (holder.restoreSavedInstanceStateMethod.annotations().size() == 0) {

holder.restoreSavedInstanceStateMethod.annotate(SuppressWarnings.class).param("value", "unchecked");

}

}

} else {

restoreStateBody.assign(ref, restoreMethodCall);

}

}

private JBlock getRestoreStateBody(JCodeModel codeModel, EBeanHolder holder) {

if (holder.restoreSavedInstanceStateMethod == null) {

holder.restoreSavedInstanceStateMethod = holder.eBean.method(PRIVATE, codeModel.VOID, "restoreSavedInstanceState_");

JClass bundleClass = holder.refClass("android.os.Bundle");

JVar savedInstanceState = holder.restoreSavedInstanceStateMethod.param(bundleClass, "savedInstanceState");

holder.initIfActivityBody.invoke(holder.restoreSavedInstanceStateMethod).arg(savedInstanceState);

holder.restoreSavedInstanceStateMethod.body() //

._if(ref("savedInstanceState").eq(_null())) //

._then()._return();

}

return holder.restoreSavedInstanceStateMethod.body();

}

private JBlock getSaveStateMethodBody(JCodeModel codeModel, EBeanHolder holder) {

if (holder.saveInstanceStateBlock == null) {

JMethod method = holder.eBean.method(PUBLIC, codeModel.VOID, "onSaveInstanceState");

method.annotate(Override.class);

JClass bundleClass = holder.refClass("android.os.Bundle");

method.param(bundleClass, BUNDLE_PARAM_NAME);

holder.saveInstanceStateBlock = method.body();

holder.saveInstanceStateBlock.invoke(JExpr._super(), "onSaveInstanceState").arg(JExpr.ref(BUNDLE_PARAM_NAME));

}

return holder.saveInstanceStateBlock;

}

private boolean isTypeParcelable(TypeElement elementType) {

TypeElement parcelableType = annotationHelper.typeElementFromQualifiedName("android.os.Parcelable");

return elementType != null && annotationHelper.isSubtype(elementType, parcelableType);

}

}