/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import art.Redefinition;

import java.util.function.Consumer;
import java.lang.reflect.Method;
import java.util.Base64;

public class Main {

    // import java.util.function.Consumer;
    //
    // class Transform {
    //     private void Start(Consumer<String> reporter) {
    //         reporter.accept("Hello - private - Transformed");
    //     }
    //
    //     private void Finish(Consumer<String> reporter) {
    //        reporter.accept("Goodbye - private - Transformed");
    //     }
    //
    //     public void sayHi(Runnable r, Consumer<String> reporter) {
    //         reporter.accept("pre Start private method call - Transformed");
    //         Start(reporter);
    //         reporter.accept("post Start private method call - Transformed");
    //         r.run();
    //         reporter.accept("pre Finish private method call - Transformed");
    //         Finish(reporter);
    //         reporter.accept("post Finish private method call - Transformed");
    //     }
    // }
    private static final byte[] CLASS_BYTES = Base64.getDecoder().decode(
            "yv66vgAAADQAMAoADQAcCAAdCwAeAB8IACAIACEKAAwAIggAIwsAJAAlCAAmCgAMACcIACgHACkH" +
            "ACoBAAY8aW5pdD4BAAMoKVYBAARDb2RlAQAPTGluZU51bWJlclRhYmxlAQAFU3RhcnQBACAoTGph" +
            "dmEvdXRpbC9mdW5jdGlvbi9Db25zdW1lcjspVgEACVNpZ25hdHVyZQEANChMamF2YS91dGlsL2Z1" +
            "bmN0aW9uL0NvbnN1bWVyPExqYXZhL2xhbmcvU3RyaW5nOz47KVYBAAZGaW5pc2gBAAVzYXlIaQEA" +
            "NChMamF2YS9sYW5nL1J1bm5hYmxlO0xqYXZhL3V0aWwvZnVuY3Rpb24vQ29uc3VtZXI7KVYBAEgo" +
            "TGphdmEvbGFuZy9SdW5uYWJsZTtMamF2YS91dGlsL2Z1bmN0aW9uL0NvbnN1bWVyPExqYXZhL2xh" +
            "bmcvU3RyaW5nOz47KVYBAApTb3VyY2VGaWxlAQAOVHJhbnNmb3JtLmphdmEMAA4ADwEAHUhlbGxv" +
            "IC0gcHJpdmF0ZSAtIFRyYW5zZm9ybWVkBwArDAAsAC0BAB9Hb29kYnllIC0gcHJpdmF0ZSAtIFRy" +
            "YW5zZm9ybWVkAQArcHJlIFN0YXJ0IHByaXZhdGUgbWV0aG9kIGNhbGwgLSBUcmFuc2Zvcm1lZAwA" +
            "EgATAQAscG9zdCBTdGFydCBwcml2YXRlIG1ldGhvZCBjYWxsIC0gVHJhbnNmb3JtZWQHAC4MAC8A" +
            "DwEALHByZSBGaW5pc2ggcHJpdmF0ZSBtZXRob2QgY2FsbCAtIFRyYW5zZm9ybWVkDAAWABMBAC1w" +
            "b3N0IEZpbmlzaCBwcml2YXRlIG1ldGhvZCBjYWxsIC0gVHJhbnNmb3JtZWQBAAlUcmFuc2Zvcm0B" +
            "ABBqYXZhL2xhbmcvT2JqZWN0AQAbamF2YS91dGlsL2Z1bmN0aW9uL0NvbnN1bWVyAQAGYWNjZXB0" +
            "AQAVKExqYXZhL2xhbmcvT2JqZWN0OylWAQASamF2YS9sYW5nL1J1bm5hYmxlAQADcnVuACAADAAN" +
            "AAAAAAAEAAAADgAPAAEAEAAAAB0AAQABAAAABSq3AAGxAAAAAQARAAAABgABAAAAEwACABIAEwAC" +
            "ABAAAAAlAAIAAgAAAAkrEgK5AAMCALEAAAABABEAAAAKAAIAAAAVAAgAFgAUAAAAAgAVAAIAFgAT" +
            "AAIAEAAAACUAAgACAAAACSsSBLkAAwIAsQAAAAEAEQAAAAoAAgAAABkACAAaABQAAAACABUAAQAX" +
            "ABgAAgAQAAAAZQACAAMAAAAxLBIFuQADAgAqLLcABiwSB7kAAwIAK7kACAEALBIJuQADAgAqLLcA" +
            "CiwSC7kAAwIAsQAAAAEAEQAAACIACAAAAB0ACAAeAA0AHwAVACAAGwAhACMAIgAoACMAMAAkABQA" +
            "AAACABkAAQAaAAAAAgAb");
    private static final byte[] DEX_BYTES = Base64.getDecoder().decode(
            "ZGV4CjAzNQBc8wr9PcHqnOR61m+0kimXTSddVMToJPuYBQAAcAAAAHhWNBIAAAAAAAAAAOAEAAAc" +
            "AAAAcAAAAAYAAADgAAAABAAAAPgAAAAAAAAAAAAAAAcAAAAoAQAAAQAAAGABAAAYBAAAgAEAAHoC" +
            "AAB9AgAAgAIAAIgCAACOAgAAlgIAALcCAADWAgAA4wIAAAIDAAAWAwAALAMAAEADAABeAwAAfQMA" +
            "AIQDAACUAwAAlwMAAJsDAACgAwAAqAMAALwDAADrAwAAGQQAAEcEAAB0BAAAeQQAAIAEAAAHAAAA" +
            "CAAAAAkAAAAKAAAADQAAABAAAAAQAAAABQAAAAAAAAARAAAABQAAAGQCAAASAAAABQAAAGwCAAAR" +
            "AAAABQAAAHQCAAAAAAAAAgAAAAAAAwAEAAAAAAADAA4AAAAAAAIAGgAAAAIAAAACAAAAAwAAABkA" +
            "AAAEAAEAEwAAAAAAAAAAAAAAAgAAAAAAAAAPAAAAPAIAAMoEAAAAAAAAAQAAAKgEAAABAAAAuAQA" +
            "AAEAAQABAAAAhwQAAAQAAABwEAQAAAAOAAMAAgACAAAAjAQAAAcAAAAbAAUAAAByIAYAAgAOAAAA" +
            "AwACAAIAAACTBAAABwAAABsABgAAAHIgBgACAA4AAAAEAAMAAgAAAJoEAAAiAAAAGwAYAAAAciAG" +
            "AAMAcCACADEAGwAWAAAAciAGAAMAchAFAAIAGwAXAAAAciAGAAMAcCABADEAGwAVAAAAciAGAAMA" +
            "DgAAAAAAAAAAAAMAAAAAAAAAAQAAAIABAAACAAAAgAEAAAMAAACIAQAAAQAAAAIAAAACAAAAAwAE" +
            "AAEAAAAEAAEoAAE8AAY8aW5pdD4ABD47KVYABkZpbmlzaAAfR29vZGJ5ZSAtIHByaXZhdGUgLSBU" +
            "cmFuc2Zvcm1lZAAdSGVsbG8gLSBwcml2YXRlIC0gVHJhbnNmb3JtZWQAC0xUcmFuc2Zvcm07AB1M" +
            "ZGFsdmlrL2Fubm90YXRpb24vU2lnbmF0dXJlOwASTGphdmEvbGFuZy9PYmplY3Q7ABRMamF2YS9s" +
            "YW5nL1J1bm5hYmxlOwASTGphdmEvbGFuZy9TdHJpbmc7ABxMamF2YS91dGlsL2Z1bmN0aW9uL0Nv" +
            "bnN1bWVyAB1MamF2YS91dGlsL2Z1bmN0aW9uL0NvbnN1bWVyOwAFU3RhcnQADlRyYW5zZm9ybS5q" +
            "YXZhAAFWAAJWTAADVkxMAAZhY2NlcHQAEmVtaXR0ZXI6IGphY2stNC4xOQAtcG9zdCBGaW5pc2gg" +
            "cHJpdmF0ZSBtZXRob2QgY2FsbCAtIFRyYW5zZm9ybWVkACxwb3N0IFN0YXJ0IHByaXZhdGUgbWV0" +
            "aG9kIGNhbGwgLSBUcmFuc2Zvcm1lZAAscHJlIEZpbmlzaCBwcml2YXRlIG1ldGhvZCBjYWxsIC0g" +
            "VHJhbnNmb3JtZWQAK3ByZSBTdGFydCBwcml2YXRlIG1ldGhvZCBjYWxsIC0gVHJhbnNmb3JtZWQA" +
            "A3J1bgAFc2F5SGkABXZhbHVlABMABw4AGQEABw5pABUBAAcOaQAdAgAABw5pPGk8aTxpAAIBARsc" +
            "BRcAFwwXARcLFwMCAQEbHAYXABcKFwwXARcLFwMAAAMBAICABJADAQKoAwECyAMDAegDDwAAAAAA" +
            "AAABAAAAAAAAAAEAAAAcAAAAcAAAAAIAAAAGAAAA4AAAAAMAAAAEAAAA+AAAAAUAAAAHAAAAKAEA" +
            "AAYAAAABAAAAYAEAAAMQAAACAAAAgAEAAAEgAAAEAAAAkAEAAAYgAAABAAAAPAIAAAEQAAADAAAA" +
            "ZAIAAAIgAAAcAAAAegIAAAMgAAAEAAAAhwQAAAQgAAACAAAAqAQAAAAgAAABAAAAygQAAAAQAAAB" +
            "AAAA4AQAAA==");

    // A class that we can use to keep track of the output of this test.
    private static class TestWatcher implements Consumer<String> {
        private StringBuilder sb;
        public TestWatcher() {
            sb = new StringBuilder();
        }

        @Override
        public void accept(String s) {
            sb.append(s);
            sb.append('\n');
        }

        public String getOutput() {
            return sb.toString();
        }

        public void clear() {
            sb = new StringBuilder();
        }
    }

    public static void main(String[] args) {
        doTest(new Transform(), new TestWatcher());
    }

    private static boolean interpreting = true;
    private static boolean retry = false;

    public static void doTest(Transform t, TestWatcher w) {
        // Get the methods that need to be optimized.
        Method say_hi_method;
        // Figure out if we can even JIT at all.
        final boolean has_jit = hasJit();
        try {
            say_hi_method = Transform.class.getDeclaredMethod(
                    "sayHi", Runnable.class, Consumer.class);
        } catch (Exception e) {
            System.out.println("Unable to find methods!");
            e.printStackTrace(System.out);
            return;
        }
        // Makes sure the stack is the way we want it for the test and does the redefinition.
        // It will set the retry boolean to true if the stack does not have a JIT-compiled
        // sayHi entry. This can only happen if the method gets GC'd.
        Runnable do_redefinition = () -> {
            if (has_jit && Main.isInterpretedFunction(say_hi_method, true)) {
                // Try again. We are not running the right jitted methods/cannot redefine them now.
                retry = true;
            } else {
                // Actually do the redefinition. The stack looks good.
                retry = false;
                w.accept("transforming calling function");
                Redefinition.doCommonClassRedefinition(Transform.class, CLASS_BYTES, DEX_BYTES);
            }
        };
        // This just prints something out to show we are running the Runnable.
        Runnable say_nothing = () -> { w.accept("Not doing anything here"); };
        do {
            // Run ensureJitCompiled here since it might get GCd
            ensureJitCompiled(Transform.class, "sayHi");
            // Clear output.
            w.clear();
            // Try and redefine.
            t.sayHi(say_nothing, w);
            t.sayHi(do_redefinition, w);
            t.sayHi(say_nothing, w);
        } while (retry);
        // Print output of last run.
        System.out.print(w.getOutput());
    }

    private static native boolean hasJit();

    private static native boolean isInterpretedFunction(Method m, boolean require_deoptimizable);

    private static native void ensureJitCompiled(Class c, String name);
}