// Copyright 2013 Google LLC
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google LLC nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifdef HAVE_CONFIG_H
#include <config.h>  // Must come first
#endif

#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#include "client/linux/minidump_writer/proc_cpuinfo_reader.h"
#include "breakpad_googletest_includes.h"
#include "common/linux/scoped_tmpfile.h"

using namespace google_breakpad;

namespace {

typedef testing::Test ProcCpuInfoReaderTest;

}

TEST(ProcCpuInfoReaderTest, EmptyFile) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString(""));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, OneLineTerminated) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("foo : bar\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  ASSERT_STREQ("bar", reader.GetValue());

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, OneLine) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("foo : bar"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  size_t value_len;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  ASSERT_STREQ("bar", reader.GetValueAndLen(&value_len));
  ASSERT_EQ(3U, value_len);

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, TwoLinesTerminated) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("foo : bar\nzoo : tut\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  ASSERT_STREQ("bar", reader.GetValue());

  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("zoo", field);
  ASSERT_STREQ("tut", reader.GetValue());

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, SkipMalformedLine) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("this line should have a column\nfoo : bar\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  ASSERT_STREQ("bar", reader.GetValue());

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, SkipOneEmptyLine) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("\n\nfoo : bar\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  ASSERT_STREQ("bar", reader.GetValue());

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, SkipEmptyField) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString(" : bar\nzoo : tut\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("zoo", field);
  ASSERT_STREQ("tut", reader.GetValue());

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, SkipTwoEmptyLines) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("foo : bar\n\n\nfoo : bar\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  ASSERT_STREQ("bar", reader.GetValue());

  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  ASSERT_STREQ("bar", reader.GetValue());

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, FieldWithSpaces) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("foo bar    : zoo\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo bar", field);
  ASSERT_STREQ("zoo", reader.GetValue());

  ASSERT_FALSE(reader.GetNextField(&field));
}

TEST(ProcCpuInfoReaderTest, EmptyValue) {
  ScopedTmpFile file;
  ASSERT_TRUE(file.InitString("foo :\n"));
  ProcCpuInfoReader reader(file.GetFd());

  const char* field;
  ASSERT_TRUE(reader.GetNextField(&field));
  ASSERT_STREQ("foo", field);
  size_t value_len;
  ASSERT_STREQ("", reader.GetValueAndLen(&value_len));
  ASSERT_EQ(0U, value_len);

  ASSERT_FALSE(reader.GetNextField(&field));
}