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/*
 * Copyright 2011-2024 GatlingCorp (https://gatling.io)
 *
 * 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.gatling.http.client.body.form;

import static java.nio.charset.StandardCharsets.UTF_8;

import io.gatling.http.client.Param;
import io.gatling.http.client.body.RequestBody;
import io.gatling.http.client.body.RequestBodyBuilder;
import io.gatling.http.client.body.WritableContent;
import io.gatling.http.client.util.Utf8UrlEncoder;
import io.gatling.shared.util.StringBuilderPool;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufUtil;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.List;

public final class FormUrlEncodedRequestBody extends RequestBody.Base> {

  private final Charset charset;

  private final CharSequence patchedContentType;
  private static final StringBuilderPool SB_POOL = new StringBuilderPool();

  public FormUrlEncodedRequestBody(
      List content, CharSequence patchedContentType, Charset charset) {
    super(content);
    this.charset = charset;
    this.patchedContentType = patchedContentType;
  }

  @Override
  public WritableContent build(ByteBufAllocator alloc) {

    StringBuilder sb = encode();

    ByteBuf bb = ByteBufUtil.writeAscii(alloc, sb);
    return new WritableContent(bb, bb.readableBytes());
  }

  private StringBuilder encode() {
    StringBuilder sb = SB_POOL.get();

    for (Param param : content) {
      encodeAndAppendFormParam(sb, param.getName(), param.getValue(), charset);
    }
    if (sb.length() > 0) {
      sb.setLength(sb.length() - 1);
    }
    return sb;
  }

  private static void encodeAndAppendFormParam(
      StringBuilder sb, String name, String value, Charset charset) {
    encodeAndAppendFormField(sb, name, charset);
    if (value != null) {
      sb.append('=');
      encodeAndAppendFormField(sb, value, charset);
    }
    sb.append('&');
  }

  private static void encodeAndAppendFormField(StringBuilder sb, String field, Charset charset) {
    if (charset.equals(UTF_8)) {
      Utf8UrlEncoder.encodeAndAppendFormElement(sb, field);
    } else {
      sb.append(URLEncoder.encode(field, charset));
    }
  }

  @Override
  public RequestBodyBuilder newBuilder() {
    return new FormUrlEncodedRequestBodyBuilder(content);
  }

  @Override
  public byte[] getBytes() {
    return encode().toString().getBytes(charset);
  }

  @Override
  public CharSequence getPatchedContentType() {
    return patchedContentType;
  }

  public Charset getCharset() {
    return charset;
  }

  @Override
  public String print(int maxLength) {
    return "FormUrlEncodedRequestBody{"
        + "patchedContentType='"
        + patchedContentType
        + "', charset="
        + charset
        + ", content="
        + truncate(encode().toString(), maxLength)
        + '}';
  }
}