// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cert_error_params.h"

#include <memory>

#include <openssl/base.h>

#include "input.h"
#include "string_util.h"

namespace bssl {

namespace {

// Parameters subclass for describing (and pretty-printing) 1 or 2 DER
// blobs. It makes a copy of the der::Inputs.
class CertErrorParams2Der : public CertErrorParams {
 public:
  CertErrorParams2Der(const char *name1, der::Input der1, const char *name2,
                      der::Input der2)
      : name1_(name1),
        der1_(BytesAsStringView(der1)),
        name2_(name2),
        der2_(BytesAsStringView(der2)) {}

  CertErrorParams2Der(const CertErrorParams2Der &) = delete;
  CertErrorParams2Der &operator=(const CertErrorParams2Der &) = delete;

  std::string ToDebugString() const override {
    std::string result;
    AppendDer(name1_, der1_, &result);
    if (name2_) {
      result += "\n";
      AppendDer(name2_, der2_, &result);
    }
    return result;
  }

 private:
  static void AppendDer(const char *name, const std::string &der,
                        std::string *out) {
    *out += name;
    // TODO(crbug.com/boringssl/661): Introduce a convenience function to go
    // from a Span<const char> to a Span<const uint8_t>.
    *out +=
        ": " + bssl::string_util::HexEncode(MakeConstSpan(
                   reinterpret_cast<const uint8_t *>(der.data()), der.size()));
  }

  const char *name1_;
  std::string der1_;

  const char *name2_;
  std::string der2_;
};

// Parameters subclass for describing (and pretty-printing) a single size_t.
class CertErrorParams1SizeT : public CertErrorParams {
 public:
  CertErrorParams1SizeT(const char *name, size_t value)
      : name_(name), value_(value) {}

  CertErrorParams1SizeT(const CertErrorParams1SizeT &) = delete;
  CertErrorParams1SizeT &operator=(const CertErrorParams1SizeT &) = delete;

  std::string ToDebugString() const override {
    return name_ + std::string(": ") +
           bssl::string_util::NumberToDecimalString(value_);
  }

 private:
  const char *name_;
  size_t value_;
};

// Parameters subclass for describing (and pretty-printing) two size_t
// values.
class CertErrorParams2SizeT : public CertErrorParams {
 public:
  CertErrorParams2SizeT(const char *name1, size_t value1, const char *name2,
                        size_t value2)
      : name1_(name1), value1_(value1), name2_(name2), value2_(value2) {}

  CertErrorParams2SizeT(const CertErrorParams2SizeT &) = delete;
  CertErrorParams2SizeT &operator=(const CertErrorParams2SizeT &) = delete;

  std::string ToDebugString() const override {
    return name1_ + std::string(": ") +
           bssl::string_util::NumberToDecimalString(value1_) + "\n" + name2_ +
           std::string(": ") +
           bssl::string_util::NumberToDecimalString(value2_);
  }

 private:
  const char *name1_;
  size_t value1_;
  const char *name2_;
  size_t value2_;
};

}  // namespace

CertErrorParams::CertErrorParams() = default;
CertErrorParams::~CertErrorParams() = default;

std::unique_ptr<CertErrorParams> CreateCertErrorParams1Der(const char *name,
                                                           der::Input der) {
  BSSL_CHECK(name);
  return std::make_unique<CertErrorParams2Der>(name, der, nullptr,
                                               der::Input());
}

std::unique_ptr<CertErrorParams> CreateCertErrorParams2Der(const char *name1,
                                                           der::Input der1,
                                                           const char *name2,
                                                           der::Input der2) {
  BSSL_CHECK(name1);
  BSSL_CHECK(name2);
  return std::make_unique<CertErrorParams2Der>(name1, der1, name2, der2);
}

std::unique_ptr<CertErrorParams> CreateCertErrorParams1SizeT(const char *name,
                                                             size_t value) {
  BSSL_CHECK(name);
  return std::make_unique<CertErrorParams1SizeT>(name, value);
}

OPENSSL_EXPORT std::unique_ptr<CertErrorParams> CreateCertErrorParams2SizeT(
    const char *name1, size_t value1, const char *name2, size_t value2) {
  BSSL_CHECK(name1);
  BSSL_CHECK(name2);
  return std::make_unique<CertErrorParams2SizeT>(name1, value1, name2, value2);
}

}  // namespace bssl