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/**
 * Copyright (C) 2014-2016 Open Whisper Systems
 *
 * Licensed according to the LICENSE file in this repository.
 */

package org.whispersystems.signalservice.internal.util;


import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;

import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.logging.Log;
import org.whispersystems.util.Base64;

import java.io.IOException;

public class JsonUtil {

  private static final String TAG = JsonUtil.class.getSimpleName();

  private static final ObjectMapper objectMapper = new ObjectMapper();

  static {
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
  }

  public static String toJson(Object object) {
    try {
      return objectMapper.writeValueAsString(object);
    } catch (JsonProcessingException e) {
      Log.w(TAG, e);
      return "";
    }
  }

  public static  T fromJson(String json, Class clazz)
      throws IOException
  {
    return objectMapper.readValue(json, clazz);
  }
  
  public static class IdentityKeySerializer extends JsonSerializer {
    @Override
    public void serialize(IdentityKey value, JsonGenerator gen, SerializerProvider serializers)
        throws IOException
    {
      gen.writeString(Base64.encodeBytesWithoutPadding(value.serialize()));
    }
  }

  public static class IdentityKeyDeserializer extends JsonDeserializer {
    @Override
    public IdentityKey deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
      try {
        return new IdentityKey(Base64.decodeWithoutPadding(p.getValueAsString()), 0);
      } catch (InvalidKeyException e) {
        throw new IOException(e);
      }
    }
  }


}