#include <config.h>

#include <apt-pkg/configuration.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/strutl.h>

#include <iostream>
#include <string>
#include <stdlib.h>

#include <gtest/gtest.h>

#include "file-helpers.h"

template <class T> void Test(const char *In,const char *Out)
{
   T Sum;
   Sum.Add(In);
   equals(Sum.Result().Value(), Out);
}



static void getSummationString(char const * const type, std::string &sum)
{
   /* to compare our result with an independent source we call the specific binaries
      and read their result back. We do this with a little trick by claiming that the
      summation is a compressor – and open the 'compressed' file later on directly to
      read out the summation sum calculated by it */
   APT::Configuration::Compressor compress(type, ".ext", type, NULL, NULL, 99);

   FileFd fd;
   auto const file = createTemporaryFile("hashsums");
   ASSERT_TRUE(fd.Open(file.Name(), FileFd::WriteOnly | FileFd::Empty, compress));
   ASSERT_TRUE(fd.IsOpen());
   FileFd input("/etc/os-release", FileFd::ReadOnly);
   ASSERT_TRUE(input.IsOpen());
   ASSERT_NE(0u, input.FileSize());
   ASSERT_TRUE(CopyFile(input, fd));
   ASSERT_TRUE(input.IsOpen());
   ASSERT_TRUE(fd.IsOpen());
   ASSERT_FALSE(fd.Failed());
   input.Close();
   fd.Close();
   ASSERT_TRUE(fd.Open(file.Name(), FileFd::ReadOnly, FileFd::None));
   ASSERT_TRUE(fd.IsOpen());
   ASSERT_NE(0u, fd.FileSize());
   ASSERT_FALSE(fd.Failed());
   char readback[2000];
   unsigned long long actual;
   ASSERT_TRUE(fd.Read(readback, sizeof(readback)/sizeof(readback[0]), &actual));
   actual -= 4;
   readback[actual] = '\0';
   sum = readback;
}
TEST(HashSumsTest, FileBased)
{
   std::string summation;

   getSummationString("md5sum", summation);
   HashString md5("MD5Sum", summation);
   EXPECT_EQ(md5.HashValue(), summation);

   getSummationString("sha1sum", summation);
   HashString sha1("SHA1", summation);
   EXPECT_EQ(sha1.HashValue(), summation);

   getSummationString("sha256sum", summation);
   HashString sha256("SHA256", summation);
   EXPECT_EQ(sha256.HashValue(), summation);

   getSummationString("sha512sum", summation);
   HashString sha512("SHA512", summation);
   EXPECT_EQ(sha512.HashValue(), summation);

   FileFd fd("/etc/os-release", FileFd::ReadOnly);
   EXPECT_TRUE(fd.IsOpen());
   std::string FileSize;
   strprintf(FileSize, "%llu", fd.FileSize());

   {
      Hashes hashes;
      hashes.AddFD(fd.Fd());
      HashStringList list = hashes.GetHashStringList();
      EXPECT_FALSE(list.empty());
      EXPECT_EQ(5u, list.size());
      EXPECT_EQ(md5.HashValue(), list.find("MD5Sum")->HashValue());
      EXPECT_EQ(sha1.HashValue(), list.find("SHA1")->HashValue());
      EXPECT_EQ(sha256.HashValue(), list.find("SHA256")->HashValue());
      EXPECT_EQ(sha512.HashValue(), list.find("SHA512")->HashValue());
      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());
   }
   unsigned long long sz = fd.FileSize();
   fd.Seek(0);
   {
      Hashes hashes;
      hashes.AddFD(fd.Fd(), sz);
      HashStringList list = hashes.GetHashStringList();
      EXPECT_FALSE(list.empty());
      EXPECT_EQ(5u, list.size());
      EXPECT_EQ(md5.HashValue(), list.find("MD5Sum")->HashValue());
      EXPECT_EQ(sha1.HashValue(), list.find("SHA1")->HashValue());
      EXPECT_EQ(sha256.HashValue(), list.find("SHA256")->HashValue());
      EXPECT_EQ(sha512.HashValue(), list.find("SHA512")->HashValue());
      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());
   }
   fd.Seek(0);
   {
      Hashes hashes(Hashes::MD5SUM | Hashes::SHA512SUM);
      hashes.AddFD(fd);
      HashStringList list = hashes.GetHashStringList();
      EXPECT_FALSE(list.empty());
      EXPECT_EQ(3u, list.size());
      EXPECT_EQ(md5.HashValue(), list.find("MD5Sum")->HashValue());
      EXPECT_EQ(NULL, list.find("SHA1"));
      EXPECT_EQ(NULL, list.find("SHA256"));
      EXPECT_EQ(sha512.HashValue(), list.find("SHA512")->HashValue());
      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());
      fd.Seek(0);
      Hashes hashes2(list);
      hashes2.AddFD(fd);
      list = hashes2.GetHashStringList();
      EXPECT_FALSE(list.empty());
      EXPECT_EQ(3u, list.size());
      EXPECT_EQ(md5.HashValue(), list.find("MD5Sum")->HashValue());
      EXPECT_EQ(NULL, list.find("SHA1"));
      EXPECT_EQ(NULL, list.find("SHA256"));
      EXPECT_EQ(sha512.HashValue(), list.find("SHA512")->HashValue());
      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());
   }
   fd.Seek(0);
   {
      Hashes MD5(Hashes::MD5SUM);
      MD5.AddFD(fd.Fd());
      EXPECT_EQ(md5, MD5.GetHashString(Hashes::MD5SUM));
   }
   fd.Seek(0);
   {
      Hashes SHA1(Hashes::SHA1SUM);
      SHA1.AddFD(fd.Fd());
      EXPECT_EQ(sha1, SHA1.GetHashString(Hashes::SHA1SUM));
   }
   fd.Seek(0);
   {
      Hashes SHA2(Hashes::SHA256SUM);
      SHA2.AddFD(fd.Fd());
      EXPECT_EQ(sha256, SHA2.GetHashString(Hashes::SHA256SUM));
   }
   fd.Seek(0);
   {
      Hashes SHA2(Hashes::SHA512SUM);
      SHA2.AddFD(fd.Fd());
      EXPECT_EQ(sha512, SHA2.GetHashString(Hashes::SHA512SUM));
   }
   fd.Close();

   HashString sha2file("SHA512", sha512.HashValue());
   EXPECT_TRUE(sha2file.VerifyFile("/etc/os-release"));
   HashString sha2wrong("SHA512", "00000000000");
   EXPECT_FALSE(sha2wrong.VerifyFile("/etc/os-release"));
   EXPECT_EQ(sha2file, sha2file);
   EXPECT_TRUE(sha2file == sha2file);
   EXPECT_NE(sha2file, sha2wrong);
   EXPECT_TRUE(sha2file != sha2wrong);

   HashString sha2big("SHA256", sha256.HashValue());
   EXPECT_TRUE(sha2big.VerifyFile("/etc/os-release"));
   HashString sha2small("sha256:" + sha256.HashValue());
   EXPECT_TRUE(sha2small.VerifyFile("/etc/os-release"));
   EXPECT_EQ(sha2big, sha2small);
   EXPECT_TRUE(sha2big == sha2small);
   EXPECT_FALSE(sha2big != sha2small);

   HashStringList hashes;
   EXPECT_TRUE(hashes.empty());
   EXPECT_TRUE(hashes.push_back(sha2file));
   EXPECT_FALSE(hashes.empty());
   EXPECT_EQ(1u, hashes.size());

   HashStringList wrong;
   EXPECT_TRUE(wrong.push_back(sha2wrong));
   EXPECT_NE(wrong, hashes);
   EXPECT_FALSE(wrong == hashes);
   EXPECT_TRUE(wrong != hashes);

   HashStringList similar;
   EXPECT_TRUE(similar.push_back(sha2big));
   EXPECT_NE(similar, hashes);
   EXPECT_FALSE(similar == hashes);
   EXPECT_TRUE(similar != hashes);

   EXPECT_TRUE(hashes.push_back(sha2big));
   EXPECT_EQ(2u, hashes.size());
   EXPECT_TRUE(hashes.push_back(sha2small));
   EXPECT_EQ(2u, hashes.size());
   EXPECT_FALSE(hashes.push_back(sha2wrong));
   EXPECT_EQ(2u, hashes.size());
   EXPECT_TRUE(hashes.VerifyFile("/etc/os-release"));

   EXPECT_EQ(similar, hashes);
   EXPECT_TRUE(similar == hashes);
   EXPECT_FALSE(similar != hashes);
   similar.clear();
   EXPECT_TRUE(similar.empty());
   EXPECT_EQ(0u, similar.size());
   EXPECT_NE(similar, hashes);
   EXPECT_FALSE(similar == hashes);
   EXPECT_TRUE(similar != hashes);
}
TEST(HashSumsTest, HashStringList)
{
   _config->Clear("Acquire::ForceHash");

   HashStringList list;
   EXPECT_TRUE(list.empty());
   EXPECT_FALSE(list.usable());
   EXPECT_EQ(0u, list.size());
   EXPECT_EQ(NULL, list.find(NULL));
   EXPECT_EQ(NULL, list.find(""));
   EXPECT_EQ(NULL, list.find("MD5Sum"));
   EXPECT_EQ(NULL, list.find("ROT26"));
   EXPECT_EQ(NULL, list.find("SHA1"));
   EXPECT_EQ(0u, list.FileSize());

   // empty lists aren't equal
   HashStringList list2;
   EXPECT_FALSE(list == list2);
   EXPECT_TRUE(list != list2);

   // some hashes don't really contribute to usability
   list.push_back(HashString("Checksum-FileSize", "29"));
   EXPECT_FALSE(list.empty());
   EXPECT_FALSE(list.usable());
   EXPECT_EQ(1u, list.size());
   EXPECT_EQ(29u, list.FileSize());
   list.push_back(HashString("MD5Sum", "d41d8cd98f00b204e9800998ecf8427e"));
   EXPECT_FALSE(list.empty());
   EXPECT_FALSE(list.usable());
   EXPECT_EQ(2u, list.size());
   EXPECT_EQ(29u, list.FileSize());
   EXPECT_TRUE(NULL != list.find("MD5Sum"));
   list.push_back(HashString("SHA1", "cacecbd74968bc90ea3342767e6b94f46ddbcafc"));
   EXPECT_FALSE(list.usable());
   EXPECT_EQ(3u, list.size());
   EXPECT_EQ(29u, list.FileSize());
   EXPECT_TRUE(NULL != list.find("MD5Sum"));
   EXPECT_TRUE(NULL != list.find("SHA1"));
   list.push_back(HashString("SHA256", "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"));
   EXPECT_TRUE(list.usable());
   EXPECT_EQ(4u, list.size());
   EXPECT_EQ(29u, list.FileSize());
   EXPECT_TRUE(NULL != list.find("MD5Sum"));
   EXPECT_TRUE(NULL != list.find("SHA1"));
   EXPECT_TRUE(NULL != list.find("SHA256"));

   Hashes hashes;
   hashes.Add("The quick brown fox jumps over the lazy dog");
   list = hashes.GetHashStringList();
   EXPECT_FALSE(list.empty());
   EXPECT_TRUE(list.usable());
   EXPECT_EQ(5u, list.size());
   EXPECT_TRUE(NULL != list.find(NULL));
   EXPECT_TRUE(NULL != list.find(""));
   EXPECT_TRUE(NULL != list.find("MD5Sum"));
   EXPECT_TRUE(NULL != list.find("Checksum-FileSize"));
   EXPECT_TRUE(NULL == list.find("ROT26"));

   _config->Set("Acquire::ForceHash", "MD5Sum");
   EXPECT_FALSE(list.empty());
   EXPECT_TRUE(list.usable());
   EXPECT_EQ(5u, list.size());
   EXPECT_TRUE(NULL != list.find(NULL));
   EXPECT_TRUE(NULL != list.find(""));
   EXPECT_TRUE(NULL != list.find("MD5Sum"));
   EXPECT_TRUE(NULL != list.find("Checksum-FileSize"));
   EXPECT_TRUE(NULL == list.find("ROT26"));

   _config->Set("Acquire::ForceHash", "ROT26");
   EXPECT_FALSE(list.empty());
   EXPECT_FALSE(list.usable());
   EXPECT_EQ(5u, list.size());
   EXPECT_TRUE(NULL == list.find(NULL));
   EXPECT_TRUE(NULL == list.find(""));
   EXPECT_TRUE(NULL != list.find("MD5Sum"));
   EXPECT_TRUE(NULL != list.find("Checksum-FileSize"));
   EXPECT_TRUE(NULL == list.find("ROT26"));

   _config->Clear("Acquire::ForceHash");

   list2.push_back(*list.find("MD5Sum"));
   EXPECT_TRUE(list == list2);
   EXPECT_FALSE(list != list2);

   // introduce a mismatch to the list
   list2.push_back(HashString("SHA1", "cacecbd74968bc90ea3342767e6b94f46ddbcafc"));
   EXPECT_FALSE(list == list2);
   EXPECT_TRUE(list != list2);

   _config->Set("Acquire::ForceHash", "MD5Sum");
   EXPECT_TRUE(list == list2);
   EXPECT_FALSE(list != list2);

   _config->Clear("Acquire::ForceHash");
}