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/*
 * Copyright 2011-2022 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.impl.request;

import static io.netty.handler.codec.http.HttpHeaderNames.*;
import static io.netty.handler.codec.http.HttpMethod.*;

import io.gatling.http.client.HttpClientConfig;
import io.gatling.http.client.Request;
import io.gatling.http.client.body.RequestBody;
import io.gatling.http.client.body.WritableContent;
import io.gatling.http.client.proxy.HttpProxyServer;
import io.gatling.http.client.uri.Uri;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.Unpooled;
import io.netty.handler.codec.http.*;
import java.io.IOException;
import java.util.function.Consumer;

public class WritableRequestBuilder {

  private static WritableRequest buildRequestWithoutBody(
      String url, HttpMethod method, HttpHeaders headers) {

    // force content-length to 0 when method usually takes a body, some servers might break
    // otherwise
    if (!headers.contains(CONTENT_LENGTH)
        && (POST.equals(method) || PUT.equals(method) || PATCH.equals(method))) {
      headers.set(CONTENT_LENGTH, 0);
    }

    FullHttpRequest nettyRequest =
        new DefaultFullHttpRequest(
            HttpVersion.HTTP_1_1,
            method,
            url,
            Unpooled.buffer(0),
            headers,
            EmptyHttpHeaders.INSTANCE);

    return new WritableRequest(nettyRequest, null);
  }

  private static WritableRequest buildRequestWithBody(
      String url,
      HttpMethod method,
      HttpHeaders headers,
      RequestBody requestBody,
      ByteBufAllocator alloc)
      throws IOException {

    WritableContent writableContent = requestBody.build(alloc);

    Object content = writableContent.getContent();

    if (content instanceof ByteBuf && !headers.contains(EXPECT, HttpHeaderValues.CONTINUE, true)) {
      ByteBuf bb = (ByteBuf) content;
      if (!headers.contains(CONTENT_LENGTH)) {
        headers.set(CONTENT_LENGTH, bb.readableBytes());
      }
      FullHttpRequest nettyRequest =
          new DefaultFullHttpRequest(
              HttpVersion.HTTP_1_1, method, url, bb, headers, EmptyHttpHeaders.INSTANCE);

      return new WritableRequest(nettyRequest, null);

    } else {
      if (!headers.contains(CONTENT_LENGTH) && !headers.contains(TRANSFER_ENCODING)) {
        if (writableContent.getContentLength() >= 0) {
          headers.set(CONTENT_LENGTH, writableContent.getContentLength());
        } else {
          headers.set(TRANSFER_ENCODING, HttpHeaderValues.CHUNKED);
        }
      }

      HttpRequest nettyRequest = new DefaultHttpRequest(HttpVersion.HTTP_1_1, method, url, headers);

      return new WritableRequest(nettyRequest, content);
    }
  }

  public static WritableRequest buildRequest(
      Request request, ByteBufAllocator alloc, HttpClientConfig config, boolean http2)
      throws Exception {
    Uri uri = request.getUri();
    HttpHeaders headers = request.getHeaders();
    RequestBody requestBody = request.getBody();

    String url =
        http2 || (request.getProxyServer() instanceof HttpProxyServer && !uri.isSecured())
            ? uri.toUrl()
            : // HTTP proxy with clear HTTP uses absolute url
            uri.toRelativeUrl();

    WritableRequest writableRequest =
        requestBody == null
            ? buildRequestWithoutBody(url, request.getMethod(), headers)
            : buildRequestWithBody(url, request.getMethod(), headers, requestBody, alloc);

    Consumer signatureCalculator = request.getSignatureCalculator();
    if (signatureCalculator != null) {
      // only apply now that WritableRequest has patched Content-Length and Transfer-Encoding
      // headers
      signatureCalculator.accept(request);
    }
    return writableRequest;
  }
}