// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/metrics/metrics_hashes.h"

#include <stddef.h>
#include <stdint.h>

#include <array>

#include "base/format_macros.h"
#include "base/strings/stringprintf.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {

struct Cases {
  std::string input;
  std::string output;
};

// Make sure our ID hashes are the same as what we see on the server side.
TEST(MetricsHashesTest, HashMetricName) {
  // The cases must match those in //tools/metrics/ukm/codegen_test.py.
  static const auto cases = std::to_array<Cases>({
      {"Back", "0x0557fa923dcee4d0"},
      {"NewTab", "0x290eb683f96572f1"},
      {"Forward", "0x67d2f6740a8eaebf"},
  });

  for (const auto& i : cases) {
    uint64_t hash = HashMetricName(i.input);
    std::string hash_hex = base::StringPrintf("0x%016" PRIx64, hash);
    EXPECT_EQ(i.output, hash_hex);
  }
}

TEST(MetricsHashesTest, HashMetricNameAs32Bits) {
  // The cases must match those in //tools/metrics/ukm/codegen_test.py.
  static const auto cases = std::to_array<Cases>({
      {"Back", "0x0557fa92"},
      {"NewTab", "0x290eb683"},
      {"Forward", "0x67d2f674"},
  });

  for (const auto& i : cases) {
    uint32_t hash = HashMetricNameAs32Bits(i.input);
    std::string hash_hex = base::StringPrintf("0x%08" PRIx32, hash);
    EXPECT_EQ(i.output, hash_hex);
  }
}

TEST(MetricsHashesTest, ParseMetricHashTo32Bits) {
  static const auto cases = std::to_array<Cases>({
    {"Back", "0x0557fa92"},
    {"NewTab", "0x290eb683"},
    {"Forward", "0x67d2f674"},
});

  for (const auto& i : cases) {
    uint64_t hash_64 = HashMetricName(i.input);
    uint32_t hash_32 = ParseMetricHashTo32Bits(hash_64);
    std::string hash_hex = base::StringPrintf("0x%08" PRIx32, hash_32);
    EXPECT_EQ(i.output, hash_hex);
  }
}

}  // namespace base