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 * The Universal Permissive License (UPL), Version 1.0
 *
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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
 * one is included with the Software each a "Larger Work" to which the Software
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.js.runtime.builtins;

import java.util.Map;
import java.util.WeakHashMap;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.builtins.WeakSetPrototypeBuiltins;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.objects.JSObjectUtil;

public final class JSWeakSet extends JSNonProxy implements JSConstructorFactory.Default, PrototypeSupplier {

    public static final JSWeakSet INSTANCE = new JSWeakSet();

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

    private JSWeakSet() {
    }

    public static DynamicObject create(JSContext context) {
        JSRealm realm = context.getRealm();
        JSObjectFactory factory = context.getWeakSetFactory();
        DynamicObject obj = factory.initProto(new JSWeakSetObject(factory.getShape(realm), newWeakHashMap()), realm);
        assert isJSWeakSet(obj);
        return context.trackAllocation(obj);
    }

    @TruffleBoundary
    private static Map<Object, Object> newWeakHashMap() {
        return new WeakHashMap<>();
    }

    @SuppressWarnings("unchecked")
    public static Map<Object, Object> getInternalWeakMap(DynamicObject obj) {
        assert isJSWeakSet(obj);
        // return (Map<DynamicObject, Object>) WEAKSET_PROPERTY.get(obj, isJSWeakSet(obj));
        return ((JSWeakSetObject) obj).getWeakHashMap();
    }

    @Override
    public DynamicObject createPrototype(final JSRealm realm, DynamicObject ctor) {
        JSContext ctx = realm.getContext();
        DynamicObject prototype = JSObjectUtil.createOrdinaryPrototypeObject(realm);
        JSObjectUtil.putConstructorProperty(ctx, prototype, ctor);
        JSObjectUtil.putFunctionsFromContainer(realm, prototype, WeakSetPrototypeBuiltins.BUILTINS);
        JSObjectUtil.putToStringTag(prototype, CLASS_NAME);
        return prototype;
    }

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

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

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

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

    @Override
    @TruffleBoundary
    public String toDisplayStringImpl(DynamicObject obj, int depth, boolean allowSideEffects, JSContext context) {
        if (context.isOptionNashornCompatibilityMode()) {
            return "[" + getClassName() + "]";
        } else {
            return getClassName();
        }
    }

    public static boolean isJSWeakSet(Object obj) {
        return obj instanceof JSWeakSetObject;
    }

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