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/*
   Copyright (c) 2014 LinkedIn Corp.

   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 com.linkedin.restli.common;


import com.linkedin.data.DataMap;
import com.linkedin.data.schema.Name;
import com.linkedin.data.schema.RecordDataSchema;
import com.linkedin.data.template.GetMode;
import com.linkedin.data.template.RecordTemplate;
import com.linkedin.data.template.SetMode;


/**
 * A manually crafted {@link RecordTemplate} that returns the entity in arbitrary class.
 * Requires the entity class literal.
 *
 * @author Keren Jin
 */
public class EntityResponse extends RecordTemplate
{
  public static final String ENTITY = "entity";
  public static final String STATUS = "status";
  public static final String ERROR = "error";

  private static final RecordDataSchema.Field _entityField;
  private static final RecordDataSchema.Field _statusField;
  private static final RecordDataSchema.Field _errorField;
  static
  {
    final StringBuilder errorBuilder = new StringBuilder();

    _entityField = new RecordDataSchema.Field(new RecordDataSchema(new Name(ENTITY), RecordDataSchema.RecordType.RECORD));
    _entityField.setName(ENTITY, errorBuilder);
    _entityField.setOptional(true);

    _statusField = new RecordDataSchema.Field(new RecordDataSchema(new Name(STATUS), RecordDataSchema.RecordType.RECORD));
    _statusField.setName(STATUS, errorBuilder);
    _statusField.setOptional(true);

    _errorField = new RecordDataSchema.Field(new RecordDataSchema(new Name(ERROR), RecordDataSchema.RecordType.RECORD));
    _errorField.setName(ERROR, errorBuilder);
    _errorField.setOptional(true);
  }

  private final Class _entityClass;

  public EntityResponse(Class entityClass)
  {
    this(new DataMap(), entityClass);
  }

  public EntityResponse(DataMap map, Class entityClass)
  {
    super(map, null);
    _entityClass = entityClass;
  }

  public Class getEntityClass()
  {
    return _entityClass;
  }

  public boolean hasEntry()
  {
    return contains(_entityField);
  }

  public E getEntity(GetMode mode)
  {
    return obtainWrapped(_entityField, _entityClass, mode);
  }

  public E getEntity()
  {
    return getEntity(GetMode.STRICT);
  }

  public boolean hasStatus()
  {
    return contains(_statusField);
  }

  public HttpStatus getStatus(GetMode mode)
  {
    final Integer statusNumber = obtainDirect(_statusField, Integer.class, mode);
    if (statusNumber == null)
    {
      return null;
    }
    else
    {
      return HttpStatus.fromCode(statusNumber);
    }
  }

  public HttpStatus getStatus()
  {
    return getStatus(GetMode.STRICT);
  }

  /**
   * @deprecated This method has typo in its name. Please use {@link #hasError()} instead.
   */
  @Deprecated
  public boolean hasErorr()
  {
    return hasError();
  }

  public boolean hasError()
  {
    return contains(_errorField);
  }

  public ErrorResponse getError(GetMode mode)
  {
    return obtainWrapped(_errorField, ErrorResponse.class, mode);
  }

  public ErrorResponse getError()
  {
    return getError(GetMode.STRICT);
  }

  public EntityResponse setEntity(E entity, SetMode mode)
  {
    putWrapped(_entityField, _entityClass, entity, mode);
    return this;
  }

  public EntityResponse setEntity(E entity)
  {
    return setEntity(entity, SetMode.DISALLOW_NULL);
  }

  public EntityResponse setStatus(HttpStatus status, SetMode mode)
  {
    final Integer statusCode;
    if (status == null)
    {
      statusCode = null;
    }
    else
    {
      statusCode = status.getCode();
    }

    putDirect(_statusField, Integer.class, statusCode, mode);
    return this;
  }

  public EntityResponse setStatus(HttpStatus status)
  {
    return setStatus(status, SetMode.DISALLOW_NULL);
  }

  public EntityResponse setError(ErrorResponse error, SetMode mode)
  {
    putWrapped(_errorField, ErrorResponse.class, error, mode);
    return this;
  }

  public EntityResponse setError(ErrorResponse error)
  {
    return setError(error, SetMode.DISALLOW_NULL);
  }
}