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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
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package com.oracle.truffle.js.nodes.access;

import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.ReadNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.objects.Undefined;

import java.util.Set;

public class WithVarWrapperNode extends JSTargetableNode implements ReadNode, WriteNode {

    @Child private JSTargetableNode withAccessNode;
    @Child private JavaScriptNode globalDelegate;
    @Child private JavaScriptNode withTarget;
    private final String varName;

    protected WithVarWrapperNode(String varName, JavaScriptNode withTarget, JSTargetableNode withAccessNode, JavaScriptNode globalDelegate) {
        this.withAccessNode = withAccessNode;
        this.globalDelegate = globalDelegate;
        this.withTarget = withTarget;
        this.varName = varName;
    }

    public static JavaScriptNode create(String varName, JavaScriptNode withTarget, JSTargetableNode withAccessNode, JavaScriptNode globalDelegate) {
        return new WithVarWrapperNode(varName, withTarget, withAccessNode, globalDelegate);
    }

    @Override
    public JavaScriptNode getTarget() {
        return withTarget;
    }

    @Override
    public Object execute(VirtualFrame frame) {
        Object target = evaluateTarget(frame);
        return executeWithTarget(frame, target);
    }

    @Override
    public Object evaluateTarget(VirtualFrame frame) {
        return withTarget.execute(frame);
    }

    @Override
    public Object executeWithTarget(VirtualFrame frame, Object target) {
        if (target != Undefined.instance) {
            // the property was found in the with object
            if (withAccessNode instanceof WritePropertyNode) {
                return ((WritePropertyNode) withAccessNode).executeWithValue(target, ((WriteNode) globalDelegate).getRhs().execute(frame));
            }
            return withAccessNode.executeWithTarget(frame, target);
        } else {
            // property not found or blocked
            return globalDelegate.execute(frame);
        }
    }

    @Override
    public Object executeWrite(VirtualFrame frame, Object value) {
        throw Errors.shouldNotReachHere();
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return create(varName, cloneUninitialized(withTarget, materializedTags), cloneUninitialized(withAccessNode, materializedTags), cloneUninitialized(globalDelegate, materializedTags));
    }

    @Override
    public JavaScriptNode getRhs() {
        return ((WriteNode) globalDelegate).getRhs();
    }
}