/*
  Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.

  This program is also distributed with certain software (including
  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have included with MySQL.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include <exception>
#include <sstream>
#include <stdexcept>

#include "mysqlrouter/uri.h"

using mysqlrouter::URI;
using mysqlrouter::URIError;
using mysqlrouter::URIParser;

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  URI uri_a;

  /*
   * assume that every valid URI that we parse can be:
   *
   * 1) turned into a string
   * 2) parsed again without exceptions
   * 3) turned into a string again that matches the string of 1)
   */

  try {
    // turn the random input into something we can turn into a string
    uri_a = URIParser::parse(std::string(Data, Data + Size));
  } catch (URIError &e) {
    // ignore parse errors
    return 0;
  }

  // shouldn't throw
  std::ostringstream uri_a_ss;

  uri_a_ss << uri_a;

  // parse what we generated. It shouldn't throw.
  URI uri_b(URIParser::parse(uri_a_ss.str()));

  if (uri_a != uri_b) {
    std::string err("URI fields differ: ");

#define APPEND_IF_NE(a, b, fld) \
  if (a.fld != b.fld)           \
    err += std::string(#fld ": ") + a.fld + " != " + b.fld + ", ";

    APPEND_IF_NE(uri_a, uri_b, scheme);
    APPEND_IF_NE(uri_a, uri_b, host);
    if (uri_a.port != uri_b.port)
      err += std::string("port: ") + std::to_string(uri_a.port) +
             " != " + std::to_string(uri_b.port) + ", ";
    APPEND_IF_NE(uri_a, uri_b, username);
    APPEND_IF_NE(uri_a, uri_b, password);

    // TODO: map/array printer
    if (uri_a.path != uri_b.path) err += std::string("path: <skipped>") + ", ";
    if (uri_a.query != uri_b.query)
      err += std::string("query: <skipped>") + ", ";
    APPEND_IF_NE(uri_a, uri_b, fragment);
#undef APPEND_IF_NE

    throw std::runtime_error(err);
  }
  // the components should be equal too
  // and it should be equal to what we fed to the parser.
  std::ostringstream uri_b_ss;

  uri_b_ss << uri_b;

  if (uri_a_ss.str() != uri_b_ss.str()) {
    throw std::runtime_error("URIs differ: " + uri_a_ss.str() +
                             " != " + uri_b_ss.str());
  }

  return 0;
}