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/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * 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.servicecomb.common.rest.codec;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.servicecomb.common.rest.definition.RestOperationMeta;
import io.servicecomb.common.rest.definition.RestParam;
import io.servicecomb.swagger.invocation.exception.ExceptionFactory;
import io.servicecomb.swagger.invocation.exception.InvocationException;

public final class RestCodec {
  private static final Logger LOG = LoggerFactory.getLogger(RestCodec.class);

  private RestCodec() {
  }

  public static void argsToRest(Object[] args, RestOperationMeta restOperation,
      RestClientRequest clientRequest) throws Exception {
    int paramSize = restOperation.getParamList().size();
    if (paramSize == 0) {
      return;
    }

    if (paramSize != args.length) {
      throw new Exception("wrong number of arguments");
    }

    for (int idx = 0; idx < paramSize; idx++) {
      RestParam param = restOperation.getParamList().get(idx);
      param.getParamProcessor().setValue(clientRequest, args[idx]);
    }
  }

  public static Object[] restToArgs(HttpServletRequest request,
      RestOperationMeta restOperation) throws InvocationException {
    List paramList = restOperation.getParamList();

    try {
      Object[] paramValues = new Object[paramList.size()];
      for (int idx = 0; idx < paramList.size(); idx++) {
        RestParam param = paramList.get(idx);
        paramValues[idx] = param.getParamProcessor().getValue(request);
      }

      return paramValues;
    } catch (Exception e) {
      LOG.error("Parameter is not valid for operation {}. ",
          restOperation.getOperationMeta().getMicroserviceQualifiedName(),
          e);
      throw ExceptionFactory.convertProducerException(e, "Parameter is not valid.");
    }
  }
}