package emissary.command.converter;
   
   import org.apache.commons.lang3.StringUtils;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   import picocli.CommandLine.ITypeConverter;
   
   import java.nio.file.Files;
   import java.nio.file.Path;
  import java.nio.file.Paths;
  import javax.annotation.Nullable;
  
  public class PathExistsConverter implements ITypeConverter<Path> {
      private final String optionName;
  
      public PathExistsConverter() {
          this(null);
      }
  
      public PathExistsConverter(@Nullable String optionName) {
          this.optionName = optionName;
      }
  
      private static final Logger LOG = LoggerFactory.getLogger(PathExistsConverter.class);
  
      @Override
      public Path convert(String value) {
          return convert(optionName, value);
      }
  
      public Path convert(String option, String value) {
          Path p = Paths.get(StringUtils.removeEnd(value, "/"));
          // ensure the value exists
          if (!Files.exists(p)) {
              String msg = String.format("The option '%s' was configured with path '%s' which does not exist", option, p);
              LOG.error(msg);
              throw new IllegalArgumentException(msg);
          }
          return p;
      }
  
      public String getOptionName() {
          return optionName;
      }
  
  }