#include <muleunit/test.h>
#include <CFile.h>
#include <MemFile.h>
#include <MD4Hash.h>
#include <limits>
#include <kademlia/utils/UInt128.h>

using Kademlia::CUInt128;
using namespace muleunit;

namespace muleunit
{
	template <>
	wxString StringFrom<CPath>(const CPath& path)
	{
		return path.GetPrintable();
	}
}


//! The max file-size of auto-generated files to test.
const size_t TEST_LENGTH = 512;

namespace muleunit {
	//! Needed for ASSERT_EQUALS with CMD4Hash values
	template <>
	wxString StringFrom<CMD4Hash>(const CMD4Hash& hash) {
		return hash.Encode();
	}

	//! Needed for ASSERT_EQUALS with CUInt128 values
	template <>
	wxString StringFrom<CUInt128>(const CUInt128& value) {
		return value.ToHexString();
	}
}


void writePredefData(CFileDataIO* file)
{
	char data[TEST_LENGTH];

	for (size_t j = 0; j < TEST_LENGTH; ++j) {
		data[j] = j & 0xff;
	}

	file->Write(data, TEST_LENGTH);
	file->Seek(0, wxFromStart);
}



/////////////////////////////////////////////////////////////////////
// Specialize this template for each implemention
// of the CFileDataIO interface you wish to test.
//
// This struct must be a subclass of Test.
// 
// Two pointers are to be defined:
//  m_emptyFile, which must be an empty, zero-length file
//  m_predefFile, which must be TEST_LENGTH in size and
//                and contain the sequence 0..255 repeated
//                as needed.
// 
// The following functions should be overridden:
//  - setUp()
//  - tearDown()
//
template <typename TYPE>
struct FileDataIOFixture;


template <>
class FileDataIOFixture<CFile> : public Test
{
public:
	FileDataIOFixture(const wxString& testName)
		: Test(wxT("FileDataIO"), wxT("CFile - ") + testName) {}

	
	CFile* m_emptyFile;
	CFile* m_predefFile;
	
	void setUp() {
		m_emptyFile = m_predefFile = NULL;
		const CPath emptyPath = CPath(wxT("FileDataIOTest.empty"));
		const CPath datPath   = CPath(wxT("FileDataIOTest.dat"));

		m_emptyFile = new CFile();
		m_emptyFile->Create(emptyPath, true);
		ASSERT_TRUE(m_emptyFile->IsOpened());
		m_emptyFile->Close();
		m_emptyFile->Open(emptyPath, CFile::read_write);
		ASSERT_TRUE(m_emptyFile->IsOpened());
		
		m_predefFile = new CFile();
		m_predefFile->Create(datPath, true);
		ASSERT_TRUE(m_predefFile->IsOpened());
		m_predefFile->Close();
		m_predefFile->Open(datPath, CFile::read_write);
		ASSERT_TRUE(m_predefFile->IsOpened());

		writePredefData(m_predefFile);
		ASSERT_EQUALS(0u, m_predefFile->GetPosition());
		ASSERT_EQUALS(TEST_LENGTH, m_predefFile->GetLength());		
	}
	
	void tearDown() {
		delete m_emptyFile;
		delete m_predefFile;
		
		wxRemoveFile(wxT("FileDataIOTest.dat"));
		wxRemoveFile(wxT("FileDataIOTest.empty"));
	}
};


template <>
class FileDataIOFixture<CMemFile> : public Test
{
public:
	FileDataIOFixture(const wxString& testName)
		: Test(wxT("FileDataIO"), wxT("CMemFile - ") + testName) {}

	
	CMemFile* m_emptyFile;
	CMemFile* m_predefFile;
	
	void setUp() {
		m_emptyFile = m_predefFile = NULL;

		m_emptyFile = new CMemFile();
		m_predefFile = new CMemFile();
		
		writePredefData(m_predefFile);		
		ASSERT_EQUALS(0u, m_predefFile->GetPosition());
		ASSERT_EQUALS(TEST_LENGTH, m_predefFile->GetLength());
	}
	
	void tearDown() {
		delete m_emptyFile;
		delete m_predefFile;
	}
};


/////////////////////////////////////////////////////////////////////
// A writeWrite interface should be implemented for each set of 
// read/write functions that is to be tested. The following 3
// static functions must be implemented in each specialization of the
// template:
//
//  - TYPE genValue(size_t j), which returns the expected value at 
//    position j in the files with predefined data.
//  - TYPE readValue(CFileDataIO*), which returns and returns the
//    value at the current position in the file.
//  - void writeValue(CFileDataIO*, TYPE), which writes the given
//    value at the current position in the file.
//  - wxString name(), which returns the human-readble name of the type
//
template <typename TYPE>
struct RWInterface;

template <>
struct RWInterface<uint8>
{
	static uint8 genValue(size_t j) {
		return j & 0xff;
	}

	static uint8 readValue(CFileDataIO* file) {
		return file->ReadUInt8();
	}
	
	static void writeValue(CFileDataIO* file, uint8 value) {
		file->WriteUInt8(value);
	}

	static wxString name() { return wxT("UInt8"); }
};


template <>
struct RWInterface<uint16>
{
	static uint16 genValue(size_t j) {
		return (((j + 1) & 0xff) << 8) | (j & 0xff);
	}

	static uint16 readValue(CFileDataIO* file) {
		return file->ReadUInt16();
	}
	
	static void writeValue(CFileDataIO* file, uint16 value) {
		file->WriteUInt16(value);
	}
	
	static wxString name() { return wxT("UInt16"); }
};


template <>
struct RWInterface<uint32>
{
	static uint32 genValue(size_t j) {
		return (((j + 3) & 0xff) << 24) | (((j + 2) & 0xff) << 16) | (((j + 1) & 0xff) << 8) | (j & 0xff);
	}

	static uint32 readValue(CFileDataIO* file) {
		return file->ReadUInt32();
	}
	
	static void writeValue(CFileDataIO* file, uint32 value) {
		file->WriteUInt32(value);
	}

	static wxString name() { return wxT("UInt32"); }
};


template <>
struct RWInterface<CMD4Hash>
{
	static CMD4Hash genValue(size_t j) {
		CMD4Hash value;
		for (size_t y = j; y < j + 16; y++) {
			value[y - j] = y & 0xff;
		}
		
		return value;
	}

	static CMD4Hash readValue(CFileDataIO* file) {
		return file->ReadHash();
	}
	
	static void writeValue(CFileDataIO* file, CMD4Hash value) {
		file->WriteHash(value);
	}

	static wxString name() { return wxT("CMD4Hash"); }
};


template <>
struct RWInterface<CUInt128>
{
	static CUInt128 genValue(size_t j) {
		CUInt128 value;
		for (size_t y = 0; y < 16; y += 4) {
			value.Set32BitChunk(y >> 2,
					    ((j + y    ) & 0xff)       |
					    ((j + y + 1) & 0xff) << 8  |
					    ((j + y + 2) & 0xff) << 16 |
					    ((j + y + 3) & 0xff) << 24);
		}

		return value;
	}

	static CUInt128 readValue(CFileDataIO* file) {
		return file->ReadUInt128();
	}
	
	static void writeValue(CFileDataIO* file, CUInt128 value) {
		file->WriteUInt128(value);
	}

	static wxString name() { return wxT("CUInt128"); }
};


/////////////////////////////////////////////////////////////////////
// The following tests ensure that the given implementations
// of the CFileDataIO interface properly does so.

template <typename IMPL, typename TYPE, size_t SIZE>
class ReadTest : public FileDataIOFixture<IMPL>
{
	typedef RWInterface<TYPE> RW;
	
public:
	ReadTest()
		: FileDataIOFixture<IMPL>(wxT("Read ") + RW::name()) {}
	
	void run() {
		CFileDataIO* file = this->m_predefFile;
		
		for (size_t j = 0; j < TEST_LENGTH + 1 - SIZE; ++j) {
			ASSERT_EQUALS(j, file->Seek(j, wxFromStart));
			ASSERT_EQUALS(j, file->GetPosition());
			ASSERT_EQUALS(RW::genValue(j), RW::readValue(file));
			ASSERT_EQUALS(j + SIZE, file->GetPosition());
		}

		ASSERT_EQUALS(TEST_LENGTH, file->GetLength());

		// Check reads past EOF
		for (size_t i = 0; i < SIZE; ++i) {
			ASSERT_EQUALS(TEST_LENGTH - i, file->Seek(-(signed)i, wxFromEnd));
			ASSERT_RAISES(CEOFException, RW::readValue(file));
		}

		// Check that only the given length is written to the target buffer
		char testBuffer[32];
		memset(testBuffer, 127, 32);
		char* buf = testBuffer + 8;
		
		for (int i = 0; i < 16; ++i) {
			ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
			ASSERT_EQUALS(0u, file->GetPosition());

			file->Read(buf, i + 1);

			for (int j = 0; j < 32; ++j) {
				if (j < 8 || j > i + 8) {
					ASSERT_EQUALS(127, (int)testBuffer[j]);
				} else {
					ASSERT_EQUALS(j - 8, (int)testBuffer[j]);
				}
			}
		}		
	}
};


template <typename IMPL, typename TYPE, size_t SIZE>
class WriteTest : public FileDataIOFixture<IMPL>
{
	typedef RWInterface<TYPE> RW;

public:
	WriteTest()
		: FileDataIOFixture<IMPL>(wxT("Write ") + RW::name()) {}

	void run() {
		const unsigned char CanaryData = 170;
		const char canaryBlock[] = { CanaryData };

		CFileDataIO* file = this->m_predefFile;
		
		for (size_t j = 0; j < TEST_LENGTH + 1 - SIZE; ++j) {
			// Clear before, after and at the target byte(s)
			for (int t = -SIZE; t < (int)(2*SIZE); ++t) {
				if ((j + t) < TEST_LENGTH && ((int)j + t) >= 0) {
					file->Seek(j + t, wxFromStart);
					ASSERT_EQUALS(j + t, file->GetPosition());
					file->Write(canaryBlock, 1);
					ASSERT_EQUALS(j + t + 1, file->GetPosition());

					// Check that canary was written
					file->Seek(j + t, wxFromStart);
					ASSERT_EQUALS(CanaryData, file->ReadUInt8());
					ASSERT_EQUALS(j + t + 1, file->GetPosition());					
				}
			}
				
			file->Seek(j, wxFromStart);

			ASSERT_EQUALS(j, file->GetPosition());
			RW::writeValue(file, RW::genValue(j));
			ASSERT_EQUALS(j + SIZE, file->GetPosition());
				
			// Check before, after and at the target byte
			for (int t = -SIZE; t < (int)(2*SIZE); ++t) {
				if ((j + t) < TEST_LENGTH && ((int)j + t) >= 0) {
					if (t) {
						if (t < 0 || t >= (int)SIZE) {
							file->Seek(j + t, wxFromStart);
							ASSERT_EQUALS(CanaryData, file->ReadUInt8());
							ASSERT_EQUALS(j + t + 1, file->GetPosition());
						}
					} else {
						file->Seek(j + t, wxFromStart);
						ASSERT_EQUALS(RW::genValue(j), RW::readValue(file));
						ASSERT_EQUALS(j + t + SIZE, file->GetPosition());
					}
				}
			}
		}

		ASSERT_EQUALS(TEST_LENGTH, file->GetLength());
	}
};


template <typename IMPL>
class SeekTest : public FileDataIOFixture<IMPL>
{
public:
	SeekTest()
		: FileDataIOFixture<IMPL>(wxT("Seek")) {}
	
	void run() {
		CFileDataIO* file = this->m_predefFile;
		
		ASSERT_EQUALS(0u, file->GetPosition());
		for (size_t pos = 0; pos < TEST_LENGTH * 2; pos += pos + 1) {
			ASSERT_EQUALS(pos, file->Seek(pos, wxFromStart));
			ASSERT_EQUALS(pos, file->GetPosition());
		}
		
		ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
		ASSERT_EQUALS(0u, file->GetPosition());
		
		for (size_t pos = 0, cur = 0; pos < TEST_LENGTH * 2; pos += ++cur) {
			ASSERT_EQUALS(pos, file->Seek(cur, wxFromCurrent));
			ASSERT_EQUALS(pos, file->GetPosition());
		}
	
		ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
		ASSERT_EQUALS(0u, file->GetPosition());
		
		for (size_t pos = 0; pos < TEST_LENGTH; pos += pos + 1) {
			ASSERT_EQUALS(TEST_LENGTH - pos, file->Seek(-(signed)pos, wxFromEnd));
			ASSERT_EQUALS(TEST_LENGTH - pos, file->GetPosition());
		}

		ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
		ASSERT_EQUALS(0u, file->GetPosition());

		// Seek to negative is invalid
		for (off_t pos = 1; pos < 10; ++pos) {
			ASSERT_RAISES(CInvalidParamsEx, file->Seek(-1 * pos));
			ASSERT_EQUALS(0u, file->GetPosition());
		}

		// Corner-case
		ASSERT_RAISES(CInvalidParamsEx, file->Seek(std::numeric_limits<off_t>::min()));
		ASSERT_EQUALS(0u, file->GetPosition());
	}
};


template <typename IMPL>
class WritePastEndTest : public FileDataIOFixture<IMPL>
{
public:
	WritePastEndTest()
		: FileDataIOFixture<IMPL>(wxT("Write Past End")) {}
	
	void run() {
		CFileDataIO* file = this->m_emptyFile;

		ASSERT_EQUALS(0u, file->GetLength());
		ASSERT_EQUALS(0u, file->GetPosition());

		file->WriteUInt8(0);

		ASSERT_EQUALS(1u, file->GetLength());
		ASSERT_EQUALS(1u, file->GetPosition());
		
		file->WriteUInt16(0);

		ASSERT_EQUALS(3u, file->GetLength());
		ASSERT_EQUALS(3u, file->GetPosition());
		
		file->WriteUInt32(0);

		ASSERT_EQUALS(7u, file->GetLength());
		ASSERT_EQUALS(7u, file->GetPosition());

		file->WriteHash(CMD4Hash());

		ASSERT_EQUALS(23u, file->GetLength());
		ASSERT_EQUALS(23u, file->GetPosition());
		
		// TODO: ReadUInt128
		

		char tmp[42];
		memset(tmp, 0, 42);
		file->Write(tmp, 42);

		ASSERT_EQUALS(65u, file->GetLength());
		ASSERT_EQUALS(65u, file->GetPosition());

		// Check that the length is always increased, regardless of starting pos
		size_t length = file->GetLength();
		for (size_t j = 0; j < 16; ++j) {
			ASSERT_EQUALS(length + j - 15u, file->Seek(-15, wxFromEnd));
			ASSERT_EQUALS(length + j - 15u, file->GetPosition());
			file->WriteHash(CMD4Hash());
			ASSERT_EQUALS(length + j + 1u, file->GetLength());
			ASSERT_EQUALS(length + j + 1u, file->GetPosition());
		}
	}
};


template <typename IMPL>
class StringTest : public FileDataIOFixture<IMPL>
{
public:
	StringTest()
		: FileDataIOFixture<IMPL>(wxT("String")) {}
	
	struct Encoding
	{
		const EUtf8Str		id;
		const char*		header;
		const size_t		headLen;
	};

	struct TestString
	{
		const wxChar*		str;
		// Raw and UTF8 expected lengths ...
		const size_t		lengths[2];
	};
	
	void run() {
		CFileDataIO* file = this->m_emptyFile;
	
		// TODO: Need to test non-ascii values when using unicode/etc, zero-length lengthfields
		Encoding encodings[] = 
		{
			{utf8strNone,	NULL,			0},
			{utf8strOptBOM,	"\xEF\xBB\xBF",		3},
			{utf8strRaw,	NULL,			0}
		};
		
		TestString testData[] = 
		{
			{ wxT("0123456789abcdef"),	{ 16, 16 } },
			{ wxT(""),			{  0,  0 } },
			{ wxT("abc ø def æ ghi å"),	{ 17, 20 } },
			{ wxT("aáeéuúó"),		{  7, 11 } },
			{ wxT("uüoöÿeëaäyÿ"),		{ 11, 17 } },
		};
		
	
		for (size_t str = 0; str < ArraySize(testData); ++str) {
			CONTEXT(wxString(wxT("Testing string: '")) << testData[str].str << wxT("'"));

			for (size_t enc = 0; enc < ArraySize(encodings); ++enc) {
				CONTEXT(wxString::Format(wxT("Testing encoding: %i"), encodings[enc]));

				const wxChar* curStr = testData[str].str;
				size_t strLen = testData[str].lengths[(encodings[enc].id == utf8strNone) ? 0 : 1];
				size_t headLen = encodings[enc].headLen;
				
				file->WriteString(curStr, encodings[enc].id, 2);
				ASSERT_EQUALS(strLen + 2 + headLen, file->GetPosition());
				ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
				ASSERT_EQUALS(strLen + headLen, file->ReadUInt16());

				// Check header (if any)
				if (encodings[enc].header) {
					wxCharBuffer head(headLen);
					file->Read(head.data(), headLen);
					ASSERT_EQUALS(0, memcmp(head, encodings[enc].header, headLen));
				}
				
				ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
				ASSERT_EQUALS(curStr, file->ReadString(encodings[enc].id, 2));
				ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
				
				
				file->WriteString(curStr, encodings[enc].id, 4);
				ASSERT_EQUALS(strLen + 4 + headLen, file->GetPosition());
				ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
				ASSERT_EQUALS(strLen + headLen, file->ReadUInt32());

				// Check header (if any)
				if (encodings[enc].header) {
					wxCharBuffer head(headLen);
					file->Read(head.data(), headLen);
					ASSERT_EQUALS(0, memcmp(head, encodings[enc].header, headLen));
				}
				
				ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
				ASSERT_EQUALS(curStr, file->ReadString(encodings[enc].id, 4));
				ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
			}
		}

		CAssertOff silence;
		for (size_t enc = 0; enc < ArraySize(encodings); ++enc) {
			CONTEXT(wxString::Format(wxT("Testing encoding against poisoning: %i"), encodings[enc]));

			//////////////////////////////////////////////
			// Check if we guard against "poisoning".
			ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));

			const size_t rawLen = (((uint16)-1) * 3) / 4;
			wxString badStr(wxT('\xfe'), rawLen);

			// This will cause the string to be UTF-8 encoded,
			// thereby exceeding the max length-field size (16b).
			file->WriteString(badStr, encodings[enc].id, 2);
			file->WriteUInt16(0x7913);

			ASSERT_EQUALS(0u, file->Seek(0, wxFromStart));
			file->ReadString(true, 2);
			ASSERT_EQUALS(0x7913, file->ReadUInt16());
		}
	}
};


// Do not attempt to use this test with CMemFile.
template <typename IMPL>
class LargeFileTest : public FileDataIOFixture<IMPL>
{
public:
	LargeFileTest()
		: FileDataIOFixture<IMPL>(wxT("LargeFile")) {}
	
	void run() {
		CFile* file = dynamic_cast<CFile*>(this->m_emptyFile);
		
		ASSERT_TRUE(file != NULL);
		ASSERT_EQUALS(2147483647UL, file->Seek(2147483647L, wxFromStart));
		ASSERT_EQUALS(2147483648UL, file->Seek(1, wxFromCurrent));
		ASSERT_EQUALS(2147483648UL, file->GetPosition());
		ASSERT_EQUALS(4294967296ULL, file->Seek(4294967296ULL, wxFromStart));
		ASSERT_EQUALS(4294967296ULL, file->GetPosition());		
	}
};



/////////////////////////////////////////////////////////////////////
// Registration of all tests

ReadTest<CFile, uint8, 1>			CFileReadUInt8Test;
ReadTest<CFile, uint16, 2>			CFileReadUInt16Test;
ReadTest<CFile, uint32, 4>			CFileReadUInt32Test;
ReadTest<CFile, CMD4Hash, 16>		CFileReadCMD4HashTest;
ReadTest<CFile, CUInt128, 16>		CFileReadCUInt128Test;

WriteTest<CFile, uint8, 1>			CFileWriteUInt8Test;
WriteTest<CFile, uint16, 2>			CFileWriteUInt16Test;
WriteTest<CFile, uint32, 4>			CFileWriteUInt32Test;
WriteTest<CFile, CMD4Hash, 16>		CFileWriteCMD4HashTest;
WriteTest<CFile, CUInt128, 16>		CFileWriteCUInt128Test;

SeekTest<CFile>						CFileSeekTest;
WritePastEndTest<CFile>				CFileWritePastEnd;
StringTest<CFile>					CFileStringTest;

LargeFileTest<CFile>				CFileLargeFileTest;


ReadTest<CMemFile, uint8, 1>		CMemFileReadUInt8Test;
ReadTest<CMemFile, uint16, 2>		CMemFileReadUInt16Test;
ReadTest<CMemFile, uint32, 4>		CMemFileReadUInt32Test;
ReadTest<CMemFile, CMD4Hash, 16>	CMemFileReadCMD4HashTest;
ReadTest<CMemFile, CUInt128, 16>	CMemFileReadCUInt128Test;

WriteTest<CMemFile, uint8, 1>		CMemFileWriteUInt8Test;
WriteTest<CMemFile, uint16, 2>		CMemFileWriteUInt16Test;
WriteTest<CMemFile, uint32, 4>		CMemFileWriteUInt32Test;
WriteTest<CMemFile, CMD4Hash, 16>	CMemFileWriteCMD4HashTest;
WriteTest<CMemFile, CUInt128, 16>	CMemFileWriteCUInt128Test;

SeekTest<CMemFile>					CMemFileSeekTest;
WritePastEndTest<CMemFile>			CMemFileWritePastEnd;
StringTest<CMemFile>				CMemFileStringTest;


/////////////////////////////////////////////////////////////////////
// CMemFile specific tests

DECLARE_SIMPLE(CMemFile);

TEST(CMemFile, AttachedBuffer)
{
	const size_t BufferLength = 1024;
	byte buffer[BufferLength];
	
	for (size_t i = 0; i < BufferLength; ++i) {
		buffer[i] = i & 0xFF;
	}

	CMemFile file(buffer, BufferLength);
	for (size_t i = 0; i < BufferLength; ++i) {
		ASSERT_EQUALS(file.ReadUInt8(), i & 0xFF);
	}

	// Resizing upwards should fail
	ASSERT_RAISES(CRunTimeException, file.SetLength(BufferLength * 2));
	ASSERT_EQUALS(BufferLength, file.GetLength());

	// Resizing downwards should be ok, as should resizes up (but within bufferlen)
	file.SetLength(BufferLength / 2);
	ASSERT_EQUALS(BufferLength / 2, file.GetLength());
	file.SetLength(BufferLength);
	ASSERT_EQUALS(BufferLength, file.GetLength());
	
	// Write past end should fail
	ASSERT_EQUALS(BufferLength, file.Seek(0, wxFromEnd));
	ASSERT_RAISES(CRunTimeException, file.WriteUInt8(0));

	// Init with invalid buffer should fail
	ASSERT_RAISES(CRunTimeException, new CMemFile(static_cast<const byte*>(NULL), 1024));
	ASSERT_RAISES(CRunTimeException, new CMemFile(static_cast<byte*>(NULL), 1024));
}


TEST(CMemFile, ConstBuffer)
{
	byte arr[10];
	CMemFile file(const_cast<const byte*>(arr), sizeof(arr));
	
	ASSERT_RAISES(CRunTimeException, file.WriteUInt8(0));
	ASSERT_RAISES(CRunTimeException, file.WriteUInt16(0));
	ASSERT_RAISES(CRunTimeException, file.WriteUInt32(0));
	ASSERT_RAISES(CRunTimeException, file.WriteUInt64(0));

	char buffer[sizeof(arr)];
	ASSERT_RAISES(CRunTimeException, file.Write(buffer, sizeof(arr)));
}

	
TEST(CMemFile, SetLength)
{
	CMemFile file;

	ASSERT_EQUALS(0u, file.GetLength());
	file.SetLength(1024);	
	ASSERT_EQUALS(1024u, file.GetLength());
	ASSERT_EQUALS(1024u, file.Seek(0, wxFromEnd));
	file.SetLength(512u);	
	ASSERT_EQUALS(512u, file.GetLength());
	ASSERT_EQUALS(512u, file.Seek(0, wxFromEnd));
}


/////////////////////////////////////////////////////////////////////
// CFile specific tests

const CPath testFile = CPath(wxT("TestFile.dat"));
const unsigned testMode = 0600;

DECLARE(CFile);
	void setUp() {
		// Ensure that the testfile doesn't exist
		if (testFile.FileExists()) {
			if (!CPath::RemoveFile(testFile)) {
				MULE_VALIDATE_STATE(false, wxT("Failed to remove temporary file."));
			}
		}
	}

	void tearDown() {
		if (testFile.FileExists()) {
			CPath::RemoveFile(testFile);
		}	
	}
END_DECLARE;


TEST(CFile, Constructor)
{
	// Test initial conditions
	{
		CFile file;

		ASSERT_TRUE(!file.IsOpened());
		ASSERT_TRUE(file.fd() == CFile::fd_invalid);
		ASSERT_RAISES(CRunTimeException, file.WriteUInt8(0));
		ASSERT_RAISES(CRunTimeException, file.ReadUInt8());
		ASSERT_RAISES(CRunTimeException, file.Seek(0, wxFromStart));
		ASSERT_RAISES(CRunTimeException, file.GetLength());
		ASSERT_RAISES(CRunTimeException, file.GetPosition());
		ASSERT_RAISES(CRunTimeException, file.SetLength(13));
		ASSERT_RAISES(CRunTimeException, file.Flush());
		ASSERT_RAISES(CRunTimeException, file.Close());
		ASSERT_TRUE(!file.IsOpened());
		ASSERT_TRUE(file.fd() == CFile::fd_invalid);
	}	
	
	// Create test file
	{
		CFile file;
		ASSERT_TRUE(file.Create(testFile, false, testMode));
		ASSERT_EQUALS(testFile, file.GetFilePath());
		file.WriteUInt32(1);
	}
	
	{
		CFile file(testFile, CFile::read);
		
		ASSERT_TRUE(file.IsOpened());
		ASSERT_TRUE(file.fd() != CFile::fd_invalid);
		ASSERT_EQUALS(testFile, file.GetFilePath());
		ASSERT_EQUALS(4u, file.GetLength());
		ASSERT_EQUALS(1u, file.ReadUInt32());

		ASSERT_RAISES(CIOFailureException, file.WriteUInt8(0));
	}

	{
		CFile file(testFile, CFile::write);
		
		ASSERT_TRUE(file.IsOpened());
		ASSERT_TRUE(file.fd() != CFile::fd_invalid);
		ASSERT_EQUALS(testFile, file.GetFilePath());
		ASSERT_EQUALS(0u, file.GetPosition());
		ASSERT_EQUALS(0u, file.GetLength());
		file.WriteUInt32(1);
		ASSERT_EQUALS(0u, file.Seek(0, wxFromStart));

		ASSERT_RAISES(CIOFailureException, file.ReadUInt8());
	}

	{
		CFile file(testFile, CFile::read_write);
		
		ASSERT_TRUE(file.IsOpened());
		ASSERT_TRUE(file.fd() != CFile::fd_invalid);
		ASSERT_EQUALS(testFile, file.GetFilePath());
		ASSERT_EQUALS(4u, file.GetLength());
		ASSERT_EQUALS(0u, file.GetPosition());
		ASSERT_EQUALS(1u, file.ReadUInt32());
		ASSERT_EQUALS(0u, file.Seek(0, wxFromStart));
		file.WriteUInt32(2);
		ASSERT_EQUALS(0u, file.Seek(0, wxFromStart));
		ASSERT_EQUALS(2u, file.ReadUInt32());
	}

	{
		CFile file(testFile, CFile::write_append);
		
		ASSERT_TRUE(file.IsOpened());
		ASSERT_TRUE(file.fd() != CFile::fd_invalid);
		ASSERT_EQUALS(4u, file.GetLength());
		file.WriteUInt32(1);
		ASSERT_EQUALS(0u, file.Seek(0, wxFromStart));

		ASSERT_RAISES(CIOFailureException, file.ReadUInt8());

		ASSERT_TRUE(file.Close());
		ASSERT_TRUE(file.Open(testFile, CFile::read));
		
		ASSERT_EQUALS(2u, file.ReadUInt32());
		ASSERT_EQUALS(1u, file.ReadUInt32());
	}
}


TEST(CFile, Create)
{
	ASSERT_FALSE(testFile.FileExists());

	// Check creation of new file, when none exists, with/without overwrite	
	for (size_t i = 0; i < 2; ++i) {
		bool overwrite = (i == 1);
		
		CFile file;
		ASSERT_TRUE(!file.IsOpened());
		ASSERT_TRUE(file.fd() == CFile::fd_invalid);
		ASSERT_TRUE(file.Create(testFile, overwrite, testMode));
		ASSERT_TRUE(file.IsOpened());
		ASSERT_TRUE(file.fd() != CFile::fd_invalid);
		ASSERT_EQUALS(testFile, file.GetFilePath());
		ASSERT_TRUE(file.Close());
		ASSERT_TRUE(file.fd() == CFile::fd_invalid);
		ASSERT_TRUE(!file.IsOpened());
		
		ASSERT_TRUE(wxFile::Access(testFile.GetRaw(), wxFile::read));
		ASSERT_TRUE(wxFile::Access(testFile.GetRaw(), wxFile::write));
	
		ASSERT_TRUE(wxRemoveFile(testFile.GetRaw()));
	}

	// Create testfile, with a bit of contents
	{
		CFile file;
		ASSERT_TRUE(file.Create(testFile, false, testMode));
		ASSERT_EQUALS(testFile, file.GetFilePath());
		file.WriteUInt32(1);
	}
	
	// Check that owerwrite = false works as expected
	{
		CFile file;
		ASSERT_FALSE(file.Create(testFile, false, testMode));
		ASSERT_TRUE(file.fd() == CFile::fd_invalid);
		ASSERT_TRUE(!file.IsOpened());
		
		// Open and check contents
		ASSERT_TRUE(file.Open(testFile, CFile::read));
		ASSERT_TRUE(file.IsOpened());
		ASSERT_TRUE(file.fd() != CFile::fd_invalid);
		ASSERT_EQUALS(testFile, file.GetFilePath());
		ASSERT_EQUALS(4u, file.GetLength());
		ASSERT_EQUALS(1u, file.ReadUInt32());
		ASSERT_TRUE(file.Close());
		ASSERT_TRUE(file.fd() == CFile::fd_invalid);
		ASSERT_TRUE(!file.IsOpened());
	}

	// Check that owerwrite = true works as expected
	{
		CFile file;
		ASSERT_TRUE(file.Create(testFile, true, testMode));
		ASSERT_TRUE(file.IsOpened());
		ASSERT_TRUE(file.fd() != CFile::fd_invalid);
		ASSERT_EQUALS(testFile, file.GetFilePath());
		ASSERT_EQUALS(0u, file.GetLength());
		ASSERT_TRUE(file.Close());
		ASSERT_TRUE(file.fd() == CFile::fd_invalid);
		ASSERT_TRUE(!file.IsOpened());
	}
	
	ASSERT_TRUE(wxFile::Access(testFile.GetRaw(), wxFile::read));
	ASSERT_TRUE(wxFile::Access(testFile.GetRaw(), wxFile::write));
}


TEST(CFile, SetLength)
{
	CFile file(testFile, CFile::write);

	ASSERT_EQUALS(0u, file.GetLength());
	file.SetLength(1024);	
	ASSERT_EQUALS(1024u, file.GetLength());
	ASSERT_EQUALS(1024u, file.Seek(0, wxFromEnd));
	file.SetLength(512u);	
	ASSERT_EQUALS(512u, file.GetLength());
	ASSERT_EQUALS(512u, file.Seek(0, wxFromEnd));
}


TEST(CFile, GetAvailable)
{
	{
		CFile file(testFile, CFile::write);

		writePredefData(&file);
	}

	CFile file(testFile, CFile::read);

	const uint64 length = file.GetLength();
	while (!file.Eof()) {
		ASSERT_EQUALS(length - file.GetPosition(), file.GetAvailable());
		file.ReadUInt32();
		ASSERT_EQUALS(length - file.GetPosition(), file.GetAvailable());
	}
	
	ASSERT_EQUALS(0u, file.GetAvailable());

	file.Seek(1024, wxFromCurrent);

	ASSERT_EQUALS(0u, file.GetAvailable());
}