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/*
Copyright 2020 The Kubernetes Authors.
Licensed 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 io.kubernetes.client.custom;

import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.google.gson.TypeAdapter;
import com.google.gson.annotations.JsonAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.util.Objects;

@JsonAdapter(IntOrString.IntOrStringAdapter.class)
@JsonSerialize(using = IntOrStringJacksonSerializer.class)
public class IntOrString {
  private final boolean isInt;
  private final String strValue;
  private final Integer intValue;

  public IntOrString(final String value) {
    this.isInt = false;
    this.strValue = value;
    this.intValue = null;
  }

  public IntOrString(final int value) {
    this.isInt = true;
    this.intValue = value;
    this.strValue = null;
  }

  public boolean isInteger() {
    return isInt;
  }

  public String getStrValue() {
    if (isInt) {
      throw new IllegalStateException("Not a string");
    }
    return strValue;
  }

  public Integer getIntValue() {
    if (!isInt) {
      throw new IllegalStateException("Not an integer");
    }
    return intValue;
  }

  @Override
  public String toString() {
    return (isInt ? String.valueOf(intValue) : strValue);
  }

  @Override
  public boolean equals(Object o) {
    return this == o || (o instanceof IntOrString && equals((IntOrString) o));
  }

  private boolean equals(IntOrString o) {
    if (isInt != o.isInt) {
      return false;
    }
    return isInt ? Objects.equals(intValue, o.intValue) : Objects.equals(strValue, o.strValue);
  }

  @Override
  public int hashCode() {
    return Objects.hash(isInt, strValue, intValue);
  }

  public static class IntOrStringAdapter extends TypeAdapter {
    @Override
    public void write(JsonWriter jsonWriter, IntOrString intOrString) throws IOException {
      if (intOrString.isInteger()) {
        jsonWriter.value(intOrString.getIntValue());
      } else {
        jsonWriter.value(intOrString.getStrValue());
      }
    }

    @Override
    public IntOrString read(JsonReader jsonReader) throws IOException {
      final JsonToken nextToken = jsonReader.peek();
      if (nextToken == JsonToken.NUMBER) {
        return new IntOrString(jsonReader.nextInt());
      } else if (nextToken == JsonToken.STRING) {
        return new IntOrString(jsonReader.nextString());
      } else {
        throw new IllegalStateException("Could not deserialize to IntOrString. Was " + nextToken);
      }
    }
  }
}