/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *
 *  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.
 */

#pragma once

#include <thrust/detail/config.h>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include <thrust/functional.h>
#include <thrust/system/detail/errno.h>
#include <thrust/system/error_code.h>

#include <cstring>

THRUST_NAMESPACE_BEGIN

namespace system
{

error_category ::~error_category()
{
  ;
} // end error_category::~error_category()

error_condition error_category ::default_error_condition(int ev) const
{
  return error_condition(ev, *this);
} // end error_category::default_error_condition()

bool error_category ::equivalent(int code, const error_condition& condition) const
{
  return default_error_condition(code) == condition;
} // end error_condition::equivalent()

bool error_category ::equivalent(const error_code& code, int condition) const
{
  bool result = (this->operator==(code.category())) && (code.value() == condition);
  return result;
} // end error_code::equivalent()

bool error_category ::operator==(const error_category& rhs) const
{
  return this == &rhs;
} // end error_category::operator==()

bool error_category ::operator!=(const error_category& rhs) const
{
  return !this->operator==(rhs);
} // end error_category::operator!=()

bool error_category ::operator<(const error_category& rhs) const
{
  return thrust::less<const error_category*>()(this, &rhs);
} // end error_category::operator<()

namespace detail
{

class generic_error_category : public error_category
{
public:
  inline generic_error_category() {}

  inline virtual const char* name() const
  {
    return "generic";
  }

  inline virtual std::string message(int ev) const
  {
    static const std::string unknown_err("Unknown error");

    // XXX strerror is not thread-safe:
    //     prefer strerror_r (which is not provided on windows)
    THRUST_DIAG_PUSH
    THRUST_DIAG_SUPPRESS_MSVC(4996)
    const char* c_str = std::strerror(ev);
    THRUST_DIAG_POP
    return c_str ? std::string(c_str) : unknown_err;
  }
}; // end generic_category_result

class system_error_category : public error_category
{
public:
  inline system_error_category() {}

  inline virtual const char* name() const
  {
    return "system";
  }

  inline virtual std::string message(int ev) const
  {
    return generic_category().message(ev);
  }

  inline virtual error_condition default_error_condition(int ev) const
  {
    using namespace errc;

    switch (ev)
    {
      case eafnosupport:
        return make_error_condition(address_family_not_supported);
      case eaddrinuse:
        return make_error_condition(address_in_use);
      case eaddrnotavail:
        return make_error_condition(address_not_available);
      case eisconn:
        return make_error_condition(already_connected);
      case e2big:
        return make_error_condition(argument_list_too_long);
      case edom:
        return make_error_condition(argument_out_of_domain);
      case efault:
        return make_error_condition(bad_address);
      case ebadf:
        return make_error_condition(bad_file_descriptor);
      case ebadmsg:
        return make_error_condition(bad_message);
      case epipe:
        return make_error_condition(broken_pipe);
      case econnaborted:
        return make_error_condition(connection_aborted);
      case ealready:
        return make_error_condition(connection_already_in_progress);
      case econnrefused:
        return make_error_condition(connection_refused);
      case econnreset:
        return make_error_condition(connection_reset);
      case exdev:
        return make_error_condition(cross_device_link);
      case edestaddrreq:
        return make_error_condition(destination_address_required);
      case ebusy:
        return make_error_condition(device_or_resource_busy);
      case enotempty:
        return make_error_condition(directory_not_empty);
      case enoexec:
        return make_error_condition(executable_format_error);
      case eexist:
        return make_error_condition(file_exists);
      case efbig:
        return make_error_condition(file_too_large);
      case enametoolong:
        return make_error_condition(filename_too_long);
      case enosys:
        return make_error_condition(function_not_supported);
      case ehostunreach:
        return make_error_condition(host_unreachable);
      case eidrm:
        return make_error_condition(identifier_removed);
      case eilseq:
        return make_error_condition(illegal_byte_sequence);
      case enotty:
        return make_error_condition(inappropriate_io_control_operation);
      case eintr:
        return make_error_condition(interrupted);
      case einval:
        return make_error_condition(invalid_argument);
      case espipe:
        return make_error_condition(invalid_seek);
      case eio:
        return make_error_condition(io_error);
      case eisdir:
        return make_error_condition(is_a_directory);
      case emsgsize:
        return make_error_condition(message_size);
      case enetdown:
        return make_error_condition(network_down);
      case enetreset:
        return make_error_condition(network_reset);
      case enetunreach:
        return make_error_condition(network_unreachable);
      case enobufs:
        return make_error_condition(no_buffer_space);
      case echild:
        return make_error_condition(no_child_process);
      case enolink:
        return make_error_condition(no_link);
      case enolck:
        return make_error_condition(no_lock_available);
      case enodata:
        return make_error_condition(no_message_available);
      case enomsg:
        return make_error_condition(no_message);
      case enoprotoopt:
        return make_error_condition(no_protocol_option);
      case enospc:
        return make_error_condition(no_space_on_device);
      case enosr:
        return make_error_condition(no_stream_resources);
      case enxio:
        return make_error_condition(no_such_device_or_address);
      case enodev:
        return make_error_condition(no_such_device);
      case enoent:
        return make_error_condition(no_such_file_or_directory);
      case esrch:
        return make_error_condition(no_such_process);
      case enotdir:
        return make_error_condition(not_a_directory);
      case enotsock:
        return make_error_condition(not_a_socket);
      case enostr:
        return make_error_condition(not_a_stream);
      case enotconn:
        return make_error_condition(not_connected);
      case enomem:
        return make_error_condition(not_enough_memory);
      case enotsup:
        return make_error_condition(not_supported);
      case ecanceled:
        return make_error_condition(operation_canceled);
      case einprogress:
        return make_error_condition(operation_in_progress);
      case eperm:
        return make_error_condition(operation_not_permitted);
      case eopnotsupp:
        return make_error_condition(operation_not_supported);
      case ewouldblock:
        return make_error_condition(operation_would_block);
      case eownerdead:
        return make_error_condition(owner_dead);
      case eacces:
        return make_error_condition(permission_denied);
      case eproto:
        return make_error_condition(protocol_error);
      case eprotonosupport:
        return make_error_condition(protocol_not_supported);
      case erofs:
        return make_error_condition(read_only_file_system);
      case edeadlk:
        return make_error_condition(resource_deadlock_would_occur);
      case eagain:
        return make_error_condition(resource_unavailable_try_again);
      case erange:
        return make_error_condition(result_out_of_range);
      case enotrecoverable:
        return make_error_condition(state_not_recoverable);
      case etime:
        return make_error_condition(stream_timeout);
      case etxtbsy:
        return make_error_condition(text_file_busy);
      case etimedout:
        return make_error_condition(timed_out);
      case enfile:
        return make_error_condition(too_many_files_open_in_system);
      case emfile:
        return make_error_condition(too_many_files_open);
      case emlink:
        return make_error_condition(too_many_links);
      case eloop:
        return make_error_condition(too_many_symbolic_link_levels);
      case eoverflow:
        return make_error_condition(value_too_large);
      case eprototype:
        return make_error_condition(wrong_protocol_type);
      default:
        return error_condition(ev, system_category());
    }
  }
}; // end system_category_result

} // namespace detail

inline const error_category& generic_category()
{
  static const detail::generic_error_category result;
  return result;
}

inline const error_category& system_category()
{
  static const detail::system_error_category result;
  return result;
}

} // namespace system

THRUST_NAMESPACE_END
