// Copyright 2023 The Pigweed Authors
//
// 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
//
//     https://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 "pw_bluetooth_sapphire/internal/host/sm/error.h"

#include "pw_string/format.h"

namespace bt {
namespace {

constexpr const char* ErrorToString(sm::ErrorCode ecode) {
  switch (ecode) {
    case sm::ErrorCode::kPasskeyEntryFailed:
      return "passkey entry failed";
    case sm::ErrorCode::kOOBNotAvailable:
      return "OOB not available";
    case sm::ErrorCode::kAuthenticationRequirements:
      return "authentication requirements";
    case sm::ErrorCode::kConfirmValueFailed:
      return "confirm value failed";
    case sm::ErrorCode::kPairingNotSupported:
      return "pairing not supported";
    case sm::ErrorCode::kEncryptionKeySize:
      return "encryption key size";
    case sm::ErrorCode::kCommandNotSupported:
      return "command not supported";
    case sm::ErrorCode::kUnspecifiedReason:
      return "unspecified reason";
    case sm::ErrorCode::kRepeatedAttempts:
      return "repeated attempts";
    case sm::ErrorCode::kInvalidParameters:
      return "invalid parameters";
    case sm::ErrorCode::kDHKeyCheckFailed:
      return "DHKey check failed";
    case sm::ErrorCode::kNumericComparisonFailed:
      return "numeric comparison failed";
    case sm::ErrorCode::kBREDRPairingInProgress:
      return "BR/EDR pairing in progress";
    case sm::ErrorCode::kCrossTransportKeyDerivationNotAllowed:
      return "cross-transport key dist. not allowed";
    default:
      break;
  }
  return "(unknown)";
}

constexpr size_t kMaxErrorStringSize =
    std::string_view(
        ErrorToString(sm::ErrorCode::kCrossTransportKeyDerivationNotAllowed))
        .size();

}  // namespace

// static
std::string ProtocolErrorTraits<sm::ErrorCode>::ToString(sm::ErrorCode ecode) {
  const size_t out_size = kMaxErrorStringSize + sizeof(" (SMP 0x0e)");
  char out[out_size] = "";
  pw::StatusWithSize status =
      pw::string::Format({out, sizeof(out)},
                         "%s (SMP %#.2x)",
                         ErrorToString(ecode),
                         static_cast<unsigned int>(ecode));
  BT_DEBUG_ASSERT(status.ok());
  return out;
}

}  // namespace bt