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/*
 * Copyright (c) 2020, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * 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
 *
 * (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
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.oracle.truffle.js.runtime.builtins;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
import com.oracle.truffle.api.dsl.CachedContext;
import com.oracle.truffle.api.dsl.CachedLanguage;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.nodes.interop.ExportValueNode;
import com.oracle.truffle.js.nodes.interop.JSInteropExecuteNode;
import com.oracle.truffle.js.nodes.interop.JSInteropInstantiateNode;
import com.oracle.truffle.js.nodes.unary.IsCallableNode;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.interop.JSMetaType;
import com.oracle.truffle.js.runtime.objects.JSClassObject;
import com.oracle.truffle.js.runtime.objects.Null;
import com.oracle.truffle.js.runtime.objects.Undefined;

@ExportLibrary(InteropLibrary.class)
public final class JSProxyObject extends JSClassObject {

    private Object proxyTarget;
    private DynamicObject proxyHandler;

    protected JSProxyObject(Shape shape, Object proxyTarget, DynamicObject proxyHandler) {
        super(shape);
        this.proxyTarget = proxyTarget;
        this.proxyHandler = proxyHandler;
    }

    public DynamicObject getProxyHandler() {
        return proxyHandler;
    }

    public Object getProxyTarget() {
        return proxyTarget;
    }

    public void revoke() {
        this.proxyHandler = Null.instance;
        this.proxyTarget = Null.instance;
    }

    public static DynamicObject create(JSRealm realm, JSObjectFactory factory, Object target, DynamicObject handler) {
        return factory.initProto(new JSProxyObject(factory.getShape(realm), target, handler), realm);
    }

    @ExportMessage
    public boolean isExecutable(
                    @Cached IsCallableNode isCallable) {
        return isCallable.executeBoolean(this);
    }

    @ExportMessage
    public Object execute(Object[] args,
                    @CachedLanguage JavaScriptLanguage language,
                    @CachedContext(JavaScriptLanguage.class) JSRealm realm,
                    @Cached JSInteropExecuteNode callNode,
                    @Shared("exportValue") @Cached ExportValueNode exportNode) throws UnsupportedMessageException {
        language.interopBoundaryEnter(realm);
        try {
            Object result = callNode.execute(this, Undefined.instance, args);
            return exportNode.execute(result);
        } finally {
            language.interopBoundaryExit(realm);
        }
    }

    @ExportMessage
    public boolean isInstantiable() {
        return JSRuntime.isConstructor(this);
    }

    @ExportMessage
    public Object instantiate(Object[] args,
                    @CachedLanguage JavaScriptLanguage language,
                    @CachedContext(JavaScriptLanguage.class) JSRealm realm,
                    @Cached JSInteropInstantiateNode callNode,
                    @Shared("exportValue") @Cached ExportValueNode exportNode) throws UnsupportedMessageException {
        language.interopBoundaryEnter(realm);
        try {
            Object result = callNode.execute(this, args);
            return exportNode.execute(result);
        } finally {
            language.interopBoundaryExit(realm);
        }
    }

    @SuppressWarnings("static-method")
    @ExportMessage
    public boolean hasMetaObject() {
        return true;
    }

    @SuppressWarnings("static-method")
    @ExportMessage
    public Object getMetaObject() {
        return JSMetaType.JS_PROXY;
    }
}