/*
 * Copyright (c) 2019 Cisco and/or its affiliates.
 * 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.
 */

#include <hicn/http-proxy/HTTP1.xMessageFastParser.h>

#include <hicn/transport/http/request.h>
#include <hicn/transport/http/response.h>

#include <experimental/algorithm>
#include <experimental/functional>
#include <iostream>

#include <hicn/http-proxy/http_session.h>

constexpr char HTTPMessageFastParser::http_ok[];
constexpr char HTTPMessageFastParser::http_cors[];
constexpr char HTTPMessageFastParser::http_failed[];

std::string HTTPMessageFastParser::numbers = "0123456789";
std::string HTTPMessageFastParser::content_length = "content-length";
std::string HTTPMessageFastParser::transfer_encoding = "transfer-encoding";
std::string HTTPMessageFastParser::chunked = "chunked";
std::string HTTPMessageFastParser::cache_control = "cache-control";
std::string HTTPMessageFastParser::mpd = "mpd";
std::string HTTPMessageFastParser::connection = "connection";
std::string HTTPMessageFastParser::separator = "\r\n\r\n";

void HTTPMessageFastParser::getHeaders(const uint8_t *headers,
                                       std::size_t length, bool request,
                                       transport::Metadata *metadata) {
  if (request) {
    transport::RequestMetadata *_metadata =
        (transport::RequestMetadata *)(metadata);

    if (transport::http::HTTPRequest::parseHeaders(
            headers, length, _metadata->headers, _metadata->http_version,
            _metadata->method, _metadata->path)) {
      return;
    }
  } else {
    transport::ResponseMetadata *_metadata =
        (transport::ResponseMetadata *)(metadata);

    if (transport::http::HTTPResponse::parseHeaders(
            headers, length, _metadata->headers, _metadata->http_version,
            _metadata->status_code, _metadata->status_string)) {
      return;
    }
  }

  throw std::runtime_error("Error parsing response headers.");
}

std::size_t HTTPMessageFastParser::hasBody(const uint8_t *headers,
                                           std::size_t length) {
  const char *buffer = reinterpret_cast<const char *>(headers);
  const char *begin = buffer;
  const char *end = buffer + length;

  using std::experimental::make_boyer_moore_searcher;
  auto it = std::experimental::search(
      begin, end,
      make_boyer_moore_searcher(content_length.begin(), content_length.end()));

  if (it != end) {
    // Read header line
    auto it2 = std::find_first_of(it, end, numbers.begin(), numbers.end());
    auto it3 = std::find(it2, end, '\n');

    return std::stoul(std::string(it2, it3));
  }

  return 0;
}

bool HTTPMessageFastParser::isMpdRequest(const uint8_t *headers,
                                         std::size_t length) {
  const char *buffer = reinterpret_cast<const char *>(headers);
  const char *begin = buffer;
  const char *end = buffer + length;

  using std::experimental::make_boyer_moore_searcher;
  auto it = std::experimental::search(
      begin, end, make_boyer_moore_searcher(mpd.begin(), mpd.end()));

  if (it != end) {
    return true;
  }

  return false;
}

uint32_t HTTPMessageFastParser::parseCacheControl(const uint8_t *headers,
                                                  std::size_t length) {
  return 0;
}