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/*
 * Copyright 2003-2012 the original author or authors.
 *
 * 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 org.codehaus.groovy.classgen;

import org.codehaus.groovy.ast.ClassCodeVisitorSupport;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.InnerClassNode;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.ast.VariableScope;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
import org.codehaus.groovy.ast.stmt.ReturnStatement;
import org.codehaus.groovy.syntax.Token;
import org.codehaus.groovy.syntax.Types;
import org.objectweb.asm.Opcodes;

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

public abstract class InnerClassVisitorHelper extends ClassCodeVisitorSupport {
    protected static void setPropertyGetterDispatcher(BlockStatement block, Expression thiz, Parameter[] parameters) {
        List gStringStrings = new ArrayList();
        gStringStrings.add(new ConstantExpression(""));
        gStringStrings.add(new ConstantExpression(""));
        List gStringValues = new ArrayList();
        gStringValues.add(new VariableExpression(parameters[0]));
        block.addStatement(
                new ReturnStatement(
                        new AttributeExpression(
                                thiz,
                                new GStringExpression("$name", gStringStrings, gStringValues)
                        )
                )
        );
    }

    protected static void setPropertySetterDispatcher(BlockStatement block, Expression thiz, Parameter[] parameters) {
        List gStringStrings = new ArrayList();
        gStringStrings.add(new ConstantExpression(""));
        gStringStrings.add(new ConstantExpression(""));
        List gStringValues = new ArrayList();
        gStringValues.add(new VariableExpression(parameters[0]));
        block.addStatement(
                new ExpressionStatement(
                        new BinaryExpression(
                                new AttributeExpression(
                                        thiz,
                                        new GStringExpression("$name", gStringStrings, gStringValues)
                                ),
                                Token.newSymbol(Types.ASSIGN, -1, -1),
                                new VariableExpression(parameters[1])
                        )
                )
        );
    }

    protected static void setMethodDispatcherCode(BlockStatement block, Expression thiz, Parameter[] parameters) {
        List gStringStrings = new ArrayList();
        gStringStrings.add(new ConstantExpression(""));
        gStringStrings.add(new ConstantExpression(""));
        List gStringValues = new ArrayList();
        gStringValues.add(new VariableExpression(parameters[0]));
        block.addStatement(
                new ReturnStatement(
                        new MethodCallExpression(
                                thiz,
                                new GStringExpression("$name", gStringStrings, gStringValues),
                                new ArgumentListExpression(
                                        new SpreadExpression(new VariableExpression(parameters[1]))
                                )
                        )
                )
        );
    }

    protected static boolean isStatic(InnerClassNode node) {
        VariableScope scope = node.getVariableScope();
        if (scope != null) return scope.isInStaticContext();
        return (node.getModifiers() & Opcodes.ACC_STATIC) != 0;
    }

    protected static ClassNode getClassNode(ClassNode node, boolean isStatic) {
        if (isStatic) node = ClassHelper.CLASS_Type;
        return node;
    }

    protected static int getObjectDistance(ClassNode node) {
        int count = 0;
        while (node != null && node != ClassHelper.OBJECT_TYPE) {
            count++;
            node = node.getSuperClass();
        }
        return count;
    }

    protected static void addFieldInit(Parameter p, FieldNode fn, BlockStatement block) {
        VariableExpression ve = new VariableExpression(p);
        FieldExpression fe = new FieldExpression(fn);
        block.addStatement(new ExpressionStatement(
                new BinaryExpression(fe, Token.newSymbol(Types.ASSIGN, -1, -1), ve)
        ));
    }
}