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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.definition.path;

import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Collection;

import io.servicecomb.common.rest.codec.RestObjectMapper;
import io.servicecomb.common.rest.definition.RestParam;

public class QueryVarParamWriter extends AbstractUrlParamWriter {
  // ? or &
  private char prefix;

  public QueryVarParamWriter(char prefix, RestParam param) {
    this.param = param;
    this.prefix = prefix;
  }

  @Override
  public void write(StringBuilder builder, Object[] args) throws Exception {
    builder.append(prefix);

    Object value = getParamValue(args);
    if (value == null) {
      // 连key都不写进去，才能表达null的概念
      return;
    }

    if (value.getClass().isArray()) {
      writeArray(builder, value);
      return;
    }

    if (Collection.class.isInstance(value)) {
      writeCollection(builder, value);
      return;
    }

    writeKeyEqual(builder);
    builder.append(encodeNotNullValue(value));
  }

  private void writeKeyEqual(StringBuilder builder) {
    builder.append(param.getParamName()).append('=');
  }

  @SuppressWarnings("unchecked")
  private void writeCollection(StringBuilder builder, Object value) throws Exception {
    for (Object item : (Collection