// Copyright 2019 The Abseil 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.

#ifndef ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_

#define ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_

#include <atomic>

#include <cstdint>

#include <memory>

#include <string>

#include <utility>

#include "absl/base/attributes.h"

#include "absl/base/config.h"

#include "absl/base/nullability.h"

#include "absl/container/inlined_vector.h"

#include "absl/strings/cord.h"

#include "absl/strings/string_view.h"

#include "absl/types/optional.h"

#ifndef SWIG

// Disabled for SWIG as it doesn't parse attributes correctly.

namespace absl {

ABSL_NAMESPACE_BEGIN

// Returned Status objects may not be ignored. Codesearch doesn't handle ifdefs

// as part of a class definitions (b/6995610), so we use a forward declaration.

//

// TODO(b/176172494): ABSL_MUST_USE_RESULT should expand to the more strict

// [[nodiscard]]. For now, just use [[nodiscard]] directly when it is available.

#if ABSL_HAVE_CPP_ATTRIBUTE(nodiscard)

class [[nodiscard]] ABSL_ATTRIBUTE_TRIVIAL_ABI Status;

#else

class ABSL_MUST_USE_RESULT ABSL_ATTRIBUTE_TRIVIAL_ABI Status;

#endif

ABSL_NAMESPACE_END

}  // namespace absl

#endif  // !SWIG

namespace absl {

ABSL_NAMESPACE_BEGIN

enum class StatusCode : int;

enum class StatusToStringMode : int;

namespace status_internal {

// Container for status payloads.

struct Payload {

  std::string type_url;

  absl::Cord payload;

};

using Payloads = absl::InlinedVector<Payload, 1>;

// Reference-counted representation of Status data.

class StatusRep {

 public:

  StatusRep(absl::StatusCode code_arg, absl::string_view message_arg,

            std::unique_ptr<status_internal::Payloads> payloads_arg)

      : ref_(int32_t{1}),

        code_(code_arg),

        message_(message_arg),

        payloads_(std::move(payloads_arg)) {}

  absl::StatusCode code() const { return code_; }

  const std::string& message() const { return message_; }

  // Ref and unref are const to allow access through a const pointer, and are

  // used during copying operations.

  void Ref() const { ref_.fetch_add(1, std::memory_order_relaxed); }

  void Unref() const;

  // Payload methods correspond to the same methods in absl::Status.

  absl::optional<absl::Cord> GetPayload(absl::string_view type_url) const;

  void SetPayload(absl::string_view type_url, absl::Cord payload);

  struct EraseResult {

    bool erased;

    uintptr_t new_rep;

  };

  EraseResult ErasePayload(absl::string_view type_url);

  void ForEachPayload(

      absl::FunctionRef<void(absl::string_view, const absl::Cord&)> visitor)

      const;

  std::string ToString(StatusToStringMode mode) const;

  bool operator==(const StatusRep& other) const;

  bool operator!=(const StatusRep& other) const { return !(*this == other); }

  // Returns an equivalent heap allocated StatusRep with refcount 1.

  //

  // `this` is not safe to be used after calling as it may have been deleted.

  absl::Nonnull<StatusRep*> CloneAndUnref() const;

 private:

  mutable std::atomic<int32_t> ref_;

  absl::StatusCode code_;

  // As an internal implementation detail, we guarantee that if status.message()

  // is non-empty, then the resulting string_view is null terminated.

  // This is required to implement 'StatusMessageAsCStr(...)'

  std::string message_;

  std::unique_ptr<status_internal::Payloads> payloads_;

};

absl::StatusCode MapToLocalCode(int value);

// Returns a pointer to a newly-allocated string with the given `prefix`,

// suitable for output as an error message in assertion/`CHECK()` failures.

//

// This is an internal implementation detail for Abseil logging.

ABSL_ATTRIBUTE_PURE_FUNCTION

absl::Nonnull<std::string*> MakeCheckFailString(

    absl::Nonnull<const absl::Status*> status,

    absl::Nonnull<const char*> prefix);

}  // namespace status_internal

ABSL_NAMESPACE_END

}  // namespace absl

#endif  // ABSL_STATUS_INTERNAL_STATUS_INTERNAL_H_