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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.runtime.builtins;

import static com.oracle.truffle.js.runtime.objects.JSObjectUtil.putConstructorProperty;
import static com.oracle.truffle.js.runtime.objects.JSObjectUtil.putFunctionsFromContainer;

import java.nio.ByteBuffer;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.builtins.SharedArrayBufferFunctionBuiltins;
import com.oracle.truffle.js.builtins.SharedArrayBufferPrototypeBuiltins;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSAgentWaiterList;
import com.oracle.truffle.js.runtime.JSArguments;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSContext.BuiltinFunctionKey;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.JavaScriptRootNode;
import com.oracle.truffle.js.runtime.objects.JSObjectUtil;
import com.oracle.truffle.js.runtime.objects.Undefined;
import com.oracle.truffle.js.runtime.util.DirectByteBufferHelper;

public final class JSSharedArrayBuffer extends JSAbstractBuffer implements JSConstructorFactory.Default.WithFunctionsAndSpecies, PrototypeSupplier {

    public static final String CLASS_NAME = "SharedArrayBuffer";
    public static final String PROTOTYPE_NAME = CLASS_NAME + ".prototype";

    public static final JSSharedArrayBuffer INSTANCE = new JSSharedArrayBuffer();

    private JSSharedArrayBuffer() {
    }

    public static DynamicObject createSharedArrayBuffer(JSContext context, int length) {
        return createSharedArrayBuffer(context, DirectByteBufferHelper.allocateDirect(length));
    }

    public static DynamicObject createSharedArrayBuffer(JSContext context, ByteBuffer buffer) {
        assert buffer != null;
        JSRealm realm = context.getRealm();
        JSObjectFactory factory = context.getSharedArrayBufferFactory();
        DynamicObject obj = JSArrayBufferObject.createSharedArrayBuffer(factory.getShape(realm), buffer, new JSAgentWaiterList());
        factory.initProto(obj, realm);
        assert isJSSharedArrayBuffer(obj);
        return context.trackAllocation(obj);
    }

    @Override
    public DynamicObject createPrototype(JSRealm realm, DynamicObject ctor) {
        JSContext context = realm.getContext();
        DynamicObject arrayBufferPrototype = JSObjectUtil.createOrdinaryPrototypeObject(realm);
        putConstructorProperty(context, arrayBufferPrototype, ctor);
        putFunctionsFromContainer(realm, arrayBufferPrototype, SharedArrayBufferPrototypeBuiltins.BUILTINS);
        /* ECMA2017 24.2.4.1 get SharedArrayBuffer.prototype.byteLength */
        JSFunctionData fd = realm.getContext().getOrCreateBuiltinFunctionData(BuiltinFunctionKey.SharedArrayBufferGetByteLength, (c) -> {
            return JSFunctionData.createCallOnly(context, createByteLengthGetterCallTarget(context), 0, "get " + BYTE_LENGTH);
        });
        DynamicObject byteLengthGetter = JSFunction.create(realm, fd);
        JSObjectUtil.putToStringTag(arrayBufferPrototype, CLASS_NAME);
        JSObjectUtil.putBuiltinAccessorProperty(arrayBufferPrototype, BYTE_LENGTH, byteLengthGetter, Undefined.instance);
        return arrayBufferPrototype;
    }

    private static CallTarget createByteLengthGetterCallTarget(JSContext context) {
        return Truffle.getRuntime().createCallTarget(new JavaScriptRootNode(context.getLanguage(), null, null) {
            @Override
            public Object execute(VirtualFrame frame) {
                Object obj = JSArguments.getThisObject(frame.getArguments());
                if (isJSSharedArrayBuffer(obj)) {
                    return JSArrayBuffer.getDirectByteLength((DynamicObject) obj);
                }
                throw Errors.createTypeErrorIncompatibleReceiver(obj);
            }
        });
    }

    @Override
    public Shape makeInitialShape(JSContext context, DynamicObject prototype) {
        Shape initialShape = JSObjectUtil.getProtoChildShape(prototype, INSTANCE, context);
        return initialShape;
    }

    public static JSConstructor createConstructor(JSRealm realm) {
        return INSTANCE.createConstructorAndPrototype(realm, SharedArrayBufferFunctionBuiltins.BUILTINS);
    }

    @Override
    public String getClassName() {
        return CLASS_NAME;
    }

    @Override
    public String getClassName(DynamicObject object) {
        return getClassName();
    }

    public static boolean isJSSharedArrayBuffer(Object obj) {
        return obj instanceof JSArrayBufferObject.Shared;
    }

    public static ByteBuffer getDirectByteBuffer(DynamicObject thisObj) {
        assert isJSSharedArrayBuffer(thisObj);
        return JSArrayBufferObject.getDirectByteBuffer(thisObj);
    }

    public static JSAgentWaiterList getWaiterList(DynamicObject thisObj) {
        assert isJSSharedArrayBuffer(thisObj);
        return JSArrayBufferObject.getWaiterList(thisObj);
    }

    public static void setWaiterList(DynamicObject thisObj, JSAgentWaiterList wl) {
        assert isJSSharedArrayBuffer(thisObj);
        JSArrayBufferObject.setWaiterList(thisObj, wl);
    }

    @Override
    public DynamicObject getIntrinsicDefaultProto(JSRealm realm) {
        return realm.getSharedArrayBufferPrototype();
    }
}