/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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 android.databinding.tool.expr;

import android.databinding.tool.processing.ErrorMessages;
import android.databinding.tool.reflection.ModelAnalyzer;
import android.databinding.tool.reflection.ModelClass;
import android.databinding.tool.util.Preconditions;
import android.databinding.tool.writer.KCode;
import android.databinding.tool.writer.LayoutBinderWriterKt;

import com.google.common.collect.Lists;

import java.util.ArrayList;
import java.util.List;

public class IdentifierExpr extends Expr {
    String mName;
    String mUserDefinedType;
    private boolean mIsDeclared;

    IdentifierExpr(String name) {
        mName = name;
    }

    public String getName() {
        return mName;
    }

    /**
     * If this is root, its type should be set while parsing the XML document
     * @param userDefinedType The type of this identifier
     */
    public void setUserDefinedType(String userDefinedType) {
        mUserDefinedType = userDefinedType;
    }

    @Override
    protected String computeUniqueKey() {
        return join(mName, super.computeUniqueKey());
    }

    public String getUserDefinedType() {
        return mUserDefinedType;
    }

    @Override
    public boolean isDynamic() {
        return true;
    }

    @Override
    protected ModelClass resolveType(final ModelAnalyzer modelAnalyzer) {
        Preconditions.checkNotNull(mUserDefinedType, ErrorMessages.UNDEFINED_VARIABLE, mName);
        return modelAnalyzer.findClass(mUserDefinedType, getModel().getImports());
    }

    @Override
    protected List<Dependency> constructDependencies() {
        return new ArrayList<Dependency>();
    }

    @Override
    protected String asPackage() {
        return mUserDefinedType == null ? mName : null;
    }

    @Override
    protected KCode generateCode() {
        return new KCode(LayoutBinderWriterKt.scopedName(this));
    }

    public void setDeclared() {
        mIsDeclared = true;
    }

    public boolean isDeclared() {
        return mIsDeclared;
    }

    @Override
    public String getInvertibleError() {
        return null;
    }

    @Override
    public Expr generateInverse(ExprModel model, Expr value, String bindingClassName) {
        String thisType = bindingClassName + ".this";
        Expr target = model.builtInVariable(thisType, bindingClassName, thisType);
        return model.methodCall(target, LayoutBinderWriterKt.getSetterName(this),
                Lists.newArrayList(value));
    }

    @Override
    public Expr cloneToModel(ExprModel model) {
        return model.identifier(mName);
    }

    @Override
    public String toString() {
        return mName;
    }
}