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/*
 * Copyright (c) 2022, 2024, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package jdk.graal.compiler.hotspot.meta;

import java.util.Random;

import jdk.graal.compiler.core.phases.fuzzing.FuzzedSuites;
import jdk.graal.compiler.nodes.GraphState;
import jdk.graal.compiler.nodes.GraphState.MandatoryStages;
import jdk.graal.compiler.options.OptionValues;
import jdk.graal.compiler.phases.tiers.Suites;
import jdk.graal.compiler.phases.tiers.SuitesProvider;
import jdk.graal.compiler.serviceprovider.GraalServices;
import jdk.vm.ci.code.Architecture;

/**
 * {@link SuitesProvider} that provides different {@link FuzzedSuites} for each call to
 * {@link SuitesProvider#getDefaultSuites}.
 */
public class HotSpotFuzzedSuitesProvider extends HotSpotSuitesProvider {

    public static final String SEED_SYSTEM_PROPERTY = "test.graal.compilationplan.fuzzing.seed";

    private static ThreadLocal lastSeed = new ThreadLocal<>();

    private final HotSpotSuitesProvider provider;
    private final Random random;

    public HotSpotFuzzedSuitesProvider(HotSpotSuitesProvider provider) {
        super(provider.defaultSuitesCreator, provider.config, provider.runtime);
        this.provider = provider;
        this.random = new Random();
    }

    @Override
    public Suites getDefaultSuites(OptionValues options, Architecture arch) {
        long seed;
        String seedString = GraalServices.getSavedProperty(SEED_SYSTEM_PROPERTY);
        if (seedString != null) {
            seed = Long.parseLong(seedString);
        } else {
            seed = random.nextLong();
        }
        lastSeed.set(seed);
        return createSuites(options, seed);
    }

    public FuzzedSuites getLastSuitesForThread(OptionValues options) {
        return createSuites(options, lastSeed.get());
    }

    private FuzzedSuites createSuites(OptionValues options, long seed) {
        return FuzzedSuites.createFuzzedSuites(getOriginalSuites(options), GraphState.defaultGraphState(), MandatoryStages.getFromName(runtime.getCompilerConfigurationName()), seed);
    }

    private Suites getOriginalSuites(OptionValues options) {
        return provider.getDefaultSuites(options, provider.runtime.getTarget().arch);
    }
}