// Copyright 2016 Google Inc. All Rights Reserved.
// Author: germuth@google.com (Aaron Germuth)

// Humax Hnvram Base Testing Class

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include "gtest/gtest.h"

#define TEST_MAIN

// Tests can change this variable to temporarily write to another file
// Value restored to staticFileName at end of test
const char* hnvramFileName;
const char* staticFileName;
const int hnvramFileSize = 2048000;

// Helper Testing Methods
int hnvram_empty() {
  unsigned char buff[hnvramFileSize + 1];
  int fp = open(hnvramFileName, O_RDONLY);
  EXPECT_GT(fp, 0);
  EXPECT_EQ(hnvramFileSize, read(fp, buff, hnvramFileSize));
  EXPECT_EQ(0, close(fp));

  for(int i = 0; i < hnvramFileSize; i++) {
    if (buff[i] != '\0') {
      return 0;
    }
  }
  return 1;
}

int delete_hnvram_file() {
  char cmd[30];
  sprintf(cmd, "rm -f %s", hnvramFileName);
  int ret = system(cmd);
  if (ret != 0) {
    fprintf(stderr, "Failed to delete hnvram partition file: %s\n",
            hnvramFileName);
  }
  return ret;
}

// Base testing class
class HnvramTest : public ::testing::Test {
  public:
    HnvramTest() {}
    virtual ~HnvramTest() {}

    virtual void SetUp() {
      hnvramFileName = staticFileName;

      // Create new blank hnvram partition
      char cmd[255];
      sprintf(cmd, "dd if=/dev/zero of=%s bs=1024 count=2KB >& /dev/null",
              hnvramFileName);
      int ret = system(cmd);

      if (ret != 0) {
        fprintf(stderr, "Failed to create hnvram partition file: %s\n",
                hnvramFileName);
      }

      EXPECT_TRUE(hnvram_empty());
    }

    virtual void TearDown() {
      delete_hnvram_file();
    }
};

class HnvramEnvironment : public ::testing::Environment {
 public:
  virtual ~HnvramEnvironment() {}
  virtual void SetUp() {
    // Get Unique File Name
    // use mktemp instead of mkstemp, since we don't want to open file yet
    char fileName[255] = "/tmp/hnvram-test-XXXXXX";
    mktemp(fileName);
    if (fileName[0] == '\0') {
      fprintf(stderr, "Failed to create unique file name\n");
    }
    staticFileName = strdup(fileName);
  }

  virtual void TearDown() {
    // Just incase test case was interrupted, delete file here too
    delete_hnvram_file();
  }
};