/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.submarine.server.websocket;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;

import java.lang.reflect.Type;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.Locale;

public class DateJsonDeserializer implements JsonDeserializer{
  private final String[] DATE_FORMATS = new String[] {
      "yyyy-MM-dd'T'HH:mm:ssZ",
      "MMM d, yyyy h:mm:ss a",
      "MMM dd, yyyy HH:mm:ss",
      "yyyy-MM-dd HH:mm:ss.SSS"
  };

  @Override
  public Date deserialize(JsonElement jsonElement, Type typeOF,
      JsonDeserializationContext context) throws JsonParseException {
    for (String format : DATE_FORMATS) {
      try {
        return new SimpleDateFormat(format, Locale.US).parse(jsonElement.getAsString());
      } catch (ParseException e) {
        throw new JsonParseException("Unparsable date: \"" + jsonElement.getAsString()
            + "\". Supported formats: " + Arrays.toString(DATE_FORMATS));
      } catch (Exception e){
        e.printStackTrace();
      }
    }
    throw new RuntimeException("Unexpected Error in Deserialize Date");
  }
}
