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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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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.builtins.commonjs;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.TruffleFile;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.builtins.GlobalBuiltins;
import com.oracle.truffle.js.nodes.function.JSBuiltin;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.builtins.JSOrdinary;
import com.oracle.truffle.js.runtime.objects.JSObject;

import java.util.Map;

public abstract class CommonJSGlobalModuleGetterBuiltin extends GlobalBuiltins.JSFileLoadingOperation {

    CommonJSGlobalModuleGetterBuiltin(JSContext context, JSBuiltin builtin) {
        super(context, builtin);
    }

    @Specialization
    protected Object getObject() {
        return getOrCreateModuleObject(getContext());
    }

    @CompilerDirectives.TruffleBoundary
    public static DynamicObject getOrCreateModuleObject(JSContext context) {
        String filePath = CommonJSResolution.getCurrentFileNameFromStack();
        if (filePath != null) {
            TruffleFile truffleFile = context.getRealm().getEnv().getPublicTruffleFile(filePath);
            assert truffleFile.isRegularFile();
            Map requireCache = context.getRealm().getCommonJSRequireCache();
            DynamicObject cached = requireCache.get(truffleFile);
            if (cached != null) {
                return cached;
            } else {
                DynamicObject moduleObject = createModuleObject(context);
                requireCache.put(truffleFile, moduleObject);
                return moduleObject;
            }
        } else {
            return createModuleObject(context);
        }
    }

    private static DynamicObject createModuleObject(JSContext context) {
        DynamicObject moduleObject = JSOrdinary.create(context);
        DynamicObject exportsObject = JSOrdinary.create(context);
        JSObject.set(moduleObject, CommonJSRequireBuiltin.EXPORTS_PROPERTY_NAME, exportsObject);
        return moduleObject;
    }

}