import dev.caskeleton.adapter.outbound.persistence.api.query.CursorPayloadCodec;
import dev.caskeleton.adapter.outbound.persistence.api.query.SignedJsonCursorCodec;
import java.nio.charset.StandardCharsets;

public class JpaCursorBoundaryProbe {
  static SignedJsonCursorCodec<String> codecFor(int payloadBytes) {
    return new SignedJsonCursorCodec<>(new CursorPayloadCodec<>() {
      public String toJson(String cursor) { return "x".repeat(payloadBytes); }
      public String fromJson(String json) { return json; }
    }, "k".repeat(32).getBytes(StandardCharsets.UTF_8));
  }
  public static void main(String[] args) {
    for (int size : new int[]{2045, 2046, 2047, 2048, 2049}) {
      var codec = codecFor(size);
      try {
        String token = codec.encode("ignored");
        try {
          String decoded = codec.decode(token);
          System.out.printf("size=%d tokenChars=%d encode=OK decode=OK decodedBytes=%d%n",
              size, token.length(), decoded.getBytes(StandardCharsets.UTF_8).length);
        } catch (RuntimeException ex) {
          System.out.printf("size=%d tokenChars=%d encode=OK decode=%s:%s%n",
              size, token.length(), ex.getClass().getSimpleName(), ex.getMessage());
        }
      } catch (RuntimeException ex) {
        System.out.printf("size=%d encode=%s:%s%n", size, ex.getClass().getSimpleName(), ex.getMessage());
      }
    }
  }
}