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package com.mageddo.tobby.converter;

import java.util.StringTokenizer;

import com.mageddo.tobby.Header;
import com.mageddo.tobby.Headers;
import com.mageddo.tobby.internal.utils.StringUtils;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;

@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class HeadersConverter {

  public static final String HEADER_DELIMITER = "\n";

  public static String encodeBase64(Headers headers) {
    if (headers == null || headers.isEmpty()) {
      return null;
    }
    final StringBuilder sb = new StringBuilder();
    for (Header header : headers) {
      sb.append(HeaderConverter.encodeBase64(header));
      sb.append(HEADER_DELIMITER);
    }
    return sb.toString();
  }

  public static Headers decodeFromBase64(String text) {
    if (StringUtils.isBlank(text)) {
      return new Headers();
    }
    final Headers headers = new Headers();
    final StringTokenizer tokenizer = new StringTokenizer(text, HEADER_DELIMITER);
    while (tokenizer.hasMoreTokens()) {
      headers.add(HeaderConverter.decodeBase64(tokenizer.nextToken()));
    }
    return headers;
  }
}