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/*
 * Copyright (c) 2019, 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
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 * 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
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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package com.oracle.truffle.nfi;

import org.graalvm.collections.EconomicMap;

import com.oracle.truffle.api.TruffleException;
import com.oracle.truffle.api.TruffleLanguage.Env;
import com.oracle.truffle.api.nodes.LanguageInfo;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.nfi.spi.NFIBackend;
import com.oracle.truffle.nfi.spi.NFIBackendFactory;
import com.oracle.truffle.nfi.spi.NFIBackendTools;

final class NFIContext {

    private static final NFIBackendTools TOOLS = new NFIBackendTools() {

        @Override
        public Object createBindableSymbol(Object symbol) {
            return NFISymbol.createBindable(symbol);
        }

        @Override
        public Object createBoundSymbol(Object symbol, Object signature) {
            return NFISymbol.createBound(symbol, signature);
        }
    };

    Env env;
    final EconomicMap backendCache = EconomicMap.create();

    NFIContext(Env env) {
        this.env = env;
    }

    void patch(Env newEnv) {
        this.env = newEnv;
        this.backendCache.clear();
    }

    NFIBackend getBackend(String id) {
        NFIBackend ret = backendCache.get(id);
        if (ret != null) {
            return ret;
        }

        synchronized (backendCache) {
            ret = backendCache.get(id);
            if (ret != null) {
                return ret;
            }

            for (LanguageInfo language : env.getInternalLanguages().values()) {
                if ("nfi".equals(language.getId())) {
                    continue;
                }

                NFIBackendFactory backendFactory = env.lookup(language, NFIBackendFactory.class);
                if (backendFactory != null && backendFactory.getBackendId().equals(id)) {
                    // force initialization of the backend language
                    Source source = Source.newBuilder(language.getId(), "", "").internal(true).build();
                    try {
                        env.parseInternal(source);
                    } catch (Exception ex) {
                        boolean rethrow = true;
                        if (ex instanceof TruffleException) {
                            TruffleException te = (TruffleException) ex;
                            if (te.isIncompleteSource() || te.isSyntaxError()) {
                                rethrow = false;
                            }
                        }
                        if (rethrow) {
                            throw ex;
                        }
                    }

                    NFIBackend backend = backendFactory.createBackend(TOOLS);
                    backendCache.put(backendFactory.getBackendId(), backend);
                    return backend;
                }
            }
        }

        return null;
    }
}