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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.nodes.function;

import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.profiles.ConditionProfile;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.access.IsObjectNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.Symbol;
import com.oracle.truffle.js.runtime.builtins.JSFunction;
import com.oracle.truffle.js.runtime.objects.Undefined;

import java.util.Set;

public final class ConstructorResultNode extends JavaScriptNode {
    @Child private JavaScriptNode bodyNode;
    @Child private JavaScriptNode thisNode;
    private final boolean derived;

    @Child private IsObjectNode isObjectNode;
    private final ConditionProfile isObject = ConditionProfile.createBinaryProfile();
    private final ConditionProfile isNotUndefined = ConditionProfile.createBinaryProfile();

    private ConstructorResultNode(boolean derived, JavaScriptNode bodyNode, JavaScriptNode thisNode) {
        this.bodyNode = bodyNode;
        this.derived = derived;
        this.thisNode = thisNode;
        this.isObjectNode = IsObjectNode.create();
    }

    public static JavaScriptNode createBase(JavaScriptNode bodyNode, JavaScriptNode thisNode) {
        return new ConstructorResultNode(false, bodyNode, thisNode);
    }

    public static JavaScriptNode createDerived(JavaScriptNode bodyNode, JavaScriptNode thisNode) {
        return new ConstructorResultNode(true, bodyNode, thisNode);
    }

    @Override
    public Object execute(VirtualFrame frame) {
        Object result = bodyNode.execute(frame);

        if (isObject.profile(isObjectNode.executeBoolean(result))) {
            return result;
        }

        // If [[ConstructorKind]] == "base" or result is undefined return this, otherwise throw
        if (derived && isNotUndefined.profile(result != Undefined.instance)) {
            // throw this error in the caller realm!
            throw Errors.createTypeError("constructor result not as expected").useCallerRealm();
        }

        Object thisObject = thisNode.execute(frame);
        assert thisObject != JSFunction.CONSTRUCT;
        assert !derived || JSRuntime.isObject(thisObject) || thisObject instanceof Symbol;
        return thisObject;
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return new ConstructorResultNode(derived, cloneUninitialized(bodyNode, materializedTags), cloneUninitialized(thisNode, materializedTags));
    }
}