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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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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.interop;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.CachedContext;
import com.oracle.truffle.api.dsl.CachedLanguage;
import com.oracle.truffle.api.dsl.ImportStatic;
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.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.promise.UnwrapPromiseNode;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.builtins.JSFunctionObject;
import com.oracle.truffle.js.runtime.objects.Undefined;

Interop wrapper for async functions that unwraps the returned promise.
/**
 * Interop wrapper for async functions that unwraps the returned promise.
 */
@ImportStatic({JSConfig.class})
@ExportLibrary(value = InteropLibrary.class, delegateTo = "function")
public final class InteropAsyncFunction extends InteropFunction {

    final JSFunctionObject function;

    public InteropAsyncFunction(JSFunctionObject function) {
        super(function);
        this.function = function;
    }

    @Override
    public int hashCode() {
        return function.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        } else if (obj instanceof InteropAsyncFunction) {
            InteropAsyncFunction other = (InteropAsyncFunction) obj;
            return function.equals(other.function);
        } else {
            return false;
        }
    }

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

    @ExportMessage
    Object execute(Object[] arguments,
                    @CachedLanguage JavaScriptLanguage language,
                    @CachedContext(JavaScriptLanguage.class) JSRealm realm,
                    @Cached JSInteropExecuteNode callNode,
                    @Cached ExportValueNode exportNode,
                    @Cached(value = "create(realm.getContext())") UnwrapPromiseNode unwrapPromise) throws UnsupportedMessageException {
        assert realm.getContext().getContextOptions().interopCompletePromises();
        language.interopBoundaryEnter(realm);
        Object result;
        try {
            result = callNode.execute(function, Undefined.instance, arguments);
            result = exportNode.execute(result);
        } finally {
            language.interopBoundaryExit(realm);
        }
        /*
         * InteropCompletePromises semantics: interop calls to async functions return the async
         * resolved value (if any). If the promise resolves, its value is made available by flushing
         * the queue of pending jobs.
         */
        return unwrapPromise.execute((DynamicObject) result);
    }
}