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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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package org.openjdk.bench.java.lang.foreign;

import static java.lang.foreign.ValueLayout.JAVA_BYTE;
import static java.nio.charset.StandardCharsets.UTF_8;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)
@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Fork(value = 3)
public class FromJavaStringTest {

    private String str;
    private MemorySegment strSegment;
    private int lengthBytes;

    @Param({"5", "20", "100", "200", "451"})
    int size;

    @Setup
    public void setup() {
        var arena = Arena.ofAuto();
        while (LOREM.length() < size) {
            LOREM += LOREM;
        }
        str = LOREM.substring(0, size);
        strSegment = arena.allocateFrom(str);
        lengthBytes = str.getBytes(UTF_8).length;
    }

    @Benchmark
    public void segment_setString() {
        strSegment.setString(0, str, UTF_8);
    }

    @Benchmark
    public void segment_copyStringRaw() {
        MemorySegment.copy(str, UTF_8, 0, strSegment, 0, str.length());
    }

    @Benchmark
    public void segment_copyStringBytes() {
        byte[] bytes = str.getBytes(UTF_8);
        MemorySegment.copy(bytes, 0, strSegment, JAVA_BYTE, 0, bytes.length);
    }

    static String LOREM =
            """
            Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et
             dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip
             ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu
             fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt
             mollit anim id est laborum.
            """;
}