// Copyright 2008, Google Inc.
// All rights reserved.
//
// 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 Inc. 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
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Authors: keith.ray@gmail.com (Keith Ray)

#include "gtest/gtest-message.h"
#include "gtest/internal/gtest-filepath.h"
#include "gtest/internal/gtest-port.h"

#include <stdlib.h>

#if GTEST_OS_WINDOWS_MOBILE
#include <windows.h>
#elif GTEST_OS_WINDOWS
#include <direct.h>
#include <io.h>
#elif GTEST_OS_SYMBIAN
// Symbian OpenC has PATH_MAX in sys/syslimits.h
#include <sys/syslimits.h>
#else
#include <limits.h>
#include <climits>  // Some Linux distributions define PATH_MAX here.
#endif              // GTEST_OS_WINDOWS_MOBILE

#if GTEST_OS_WINDOWS
#define GTEST_PATH_MAX_ _MAX_PATH
#elif defined(PATH_MAX)
#define GTEST_PATH_MAX_ PATH_MAX
#elif defined(_XOPEN_PATH_MAX)
#define GTEST_PATH_MAX_ _XOPEN_PATH_MAX
#else
#define GTEST_PATH_MAX_ _POSIX_PATH_MAX
#endif  // GTEST_OS_WINDOWS

#include "gtest/internal/gtest-string.h"

namespace testing
{
namespace internal
{
#if GTEST_OS_WINDOWS
// On Windows, '\\' is the standard path separator, but many tools and the
// Windows API also accept '/' as an alternate path separator. Unless otherwise
// noted, a file path can contain either kind of path separators, or a mixture
// of them.
const char kPathSeparator = '\\';
const char kAlternatePathSeparator = '/';
const char kPathSeparatorString[] = "\\";
const char kAlternatePathSeparatorString[] = "/";
#if GTEST_OS_WINDOWS_MOBILE
// Windows CE doesn't have a current directory. You should not use
// the current directory in tests on Windows CE, but this at least
// provides a reasonable fallback.
const char kCurrentDirectoryString[] = "\\";
// Windows CE doesn't define INVALID_FILE_ATTRIBUTES
const DWORD kInvalidFileAttributes = 0xffffffff;
#else
const char kCurrentDirectoryString[] = ".\\";
#endif  // GTEST_OS_WINDOWS_MOBILE
#else
const char kPathSeparator = '/';
const char kPathSeparatorString[] = "/";
const char kCurrentDirectoryString[] = "./";
#endif  // GTEST_OS_WINDOWS

// Returns whether the given character is a valid path separator.
static bool IsPathSeparator(char c)
{
#if GTEST_HAS_ALT_PATH_SEP_
	return (c == kPathSeparator) || (c == kAlternatePathSeparator);
#else
	return c == kPathSeparator;
#endif
}

// Returns the current working directory, or "" if unsuccessful.
FilePath FilePath::GetCurrentDir()
{
#if GTEST_OS_WINDOWS_MOBILE
	// Windows CE doesn't have a current directory, so we just return
	// something reasonable.
	return FilePath(kCurrentDirectoryString);
#elif GTEST_OS_WINDOWS
	char cwd[GTEST_PATH_MAX_ + 1] = {'\0'};
	return FilePath(_getcwd(cwd, sizeof(cwd)) == NULL ? "" : cwd);
#else
	char cwd[GTEST_PATH_MAX_ + 1] = {'\0'};
	return FilePath(getcwd(cwd, sizeof(cwd)) == NULL ? "" : cwd);
#endif  // GTEST_OS_WINDOWS_MOBILE
}

// Returns a copy of the FilePath with the case-insensitive extension removed.
// Example: FilePath("dir/file.exe").RemoveExtension("EXE") returns
// FilePath("dir/file"). If a case-insensitive extension is not
// found, returns a copy of the original FilePath.
FilePath FilePath::RemoveExtension(const char* extension) const
{
	const std::string dot_extension = std::string(".") + extension;
	if (String::EndsWithCaseInsensitive(pathname_, dot_extension))
	{
		return FilePath(pathname_.substr(
			0, pathname_.length() - dot_extension.length()));
	}
	return *this;
}

// Returns a pointer to the last occurence of a valid path separator in
// the FilePath. On Windows, for example, both '/' and '\' are valid path
// separators. Returns NULL if no path separator was found.
const char* FilePath::FindLastPathSeparator() const
{
	const char* const last_sep = strrchr(c_str(), kPathSeparator);
#if GTEST_HAS_ALT_PATH_SEP_
	const char* const last_alt_sep = strrchr(c_str(), kAlternatePathSeparator);
	// Comparing two pointers of which only one is NULL is undefined.
	if (last_alt_sep != NULL &&
		(last_sep == NULL || last_alt_sep > last_sep))
	{
		return last_alt_sep;
	}
#endif
	return last_sep;
}

// Returns a copy of the FilePath with the directory part removed.
// Example: FilePath("path/to/file").RemoveDirectoryName() returns
// FilePath("file"). If there is no directory part ("just_a_file"), it returns
// the FilePath unmodified. If there is no file part ("just_a_dir/") it
// returns an empty FilePath ("").
// On Windows platform, '\' is the path separator, otherwise it is '/'.
FilePath FilePath::RemoveDirectoryName() const
{
	const char* const last_sep = FindLastPathSeparator();
	return last_sep ? FilePath(last_sep + 1) : *this;
}

// RemoveFileName returns the directory path with the filename removed.
// Example: FilePath("path/to/file").RemoveFileName() returns "path/to/".
// If the FilePath is "a_file" or "/a_file", RemoveFileName returns
// FilePath("./") or, on Windows, FilePath(".\\"). If the filepath does
// not have a file, like "just/a/dir/", it returns the FilePath unmodified.
// On Windows platform, '\' is the path separator, otherwise it is '/'.
FilePath FilePath::RemoveFileName() const
{
	const char* const last_sep = FindLastPathSeparator();
	std::string dir;
	if (last_sep)
	{
		dir = std::string(c_str(), last_sep + 1 - c_str());
	}
	else
	{
		dir = kCurrentDirectoryString;
	}
	return FilePath(dir);
}

// Helper functions for naming files in a directory for xml output.

// Given directory = "dir", base_name = "test", number = 0,
// extension = "xml", returns "dir/test.xml". If number is greater
// than zero (e.g., 12), returns "dir/test_12.xml".
// On Windows platform, uses \ as the separator rather than /.
FilePath FilePath::MakeFileName(const FilePath& directory,
								const FilePath& base_name,
								int number,
								const char* extension)
{
	std::string file;
	if (number == 0)
	{
		file = base_name.string() + "." + extension;
	}
	else
	{
		file = base_name.string() + "_" + StreamableToString(number) + "." + extension;
	}
	return ConcatPaths(directory, FilePath(file));
}

// Given directory = "dir", relative_path = "test.xml", returns "dir/test.xml".
// On Windows, uses \ as the separator rather than /.
FilePath FilePath::ConcatPaths(const FilePath& directory,
							   const FilePath& relative_path)
{
	if (directory.IsEmpty())
		return relative_path;
	const FilePath dir(directory.RemoveTrailingPathSeparator());
	return FilePath(dir.string() + kPathSeparator + relative_path.string());
}

// Returns true if pathname describes something findable in the file-system,
// either a file, directory, or whatever.
bool FilePath::FileOrDirectoryExists() const
{
#if GTEST_OS_WINDOWS_MOBILE
	LPCWSTR unicode = String::AnsiToUtf16(pathname_.c_str());
	const DWORD attributes = GetFileAttributes(unicode);
	delete[] unicode;
	return attributes != kInvalidFileAttributes;
#else
	posix::StatStruct file_stat;
	return posix::Stat(pathname_.c_str(), &file_stat) == 0;
#endif  // GTEST_OS_WINDOWS_MOBILE
}

// Returns true if pathname describes a directory in the file-system
// that exists.
bool FilePath::DirectoryExists() const
{
	bool result = false;
#if GTEST_OS_WINDOWS
	// Don't strip off trailing separator if path is a root directory on
	// Windows (like "C:\\").
	const FilePath& path(IsRootDirectory() ? *this : RemoveTrailingPathSeparator());
#else
	const FilePath& path(*this);
#endif

#if GTEST_OS_WINDOWS_MOBILE
	LPCWSTR unicode = String::AnsiToUtf16(path.c_str());
	const DWORD attributes = GetFileAttributes(unicode);
	delete[] unicode;
	if ((attributes != kInvalidFileAttributes) &&
		(attributes & FILE_ATTRIBUTE_DIRECTORY))
	{
		result = true;
	}
#else
	posix::StatStruct file_stat;
	result = posix::Stat(path.c_str(), &file_stat) == 0 &&
			 posix::IsDir(file_stat);
#endif  // GTEST_OS_WINDOWS_MOBILE

	return result;
}

// Returns true if pathname describes a root directory. (Windows has one
// root directory per disk drive.)
bool FilePath::IsRootDirectory() const
{
#if GTEST_OS_WINDOWS
	// TODO(wan@google.com): on Windows a network share like
	// \\server\share can be a root directory, although it cannot be the
	// current directory.  Handle this properly.
	return pathname_.length() == 3 && IsAbsolutePath();
#else
	return pathname_.length() == 1 && IsPathSeparator(pathname_.c_str()[0]);
#endif
}

// Returns true if pathname describes an absolute path.
bool FilePath::IsAbsolutePath() const
{
	const char* const name = pathname_.c_str();
#if GTEST_OS_WINDOWS
	return pathname_.length() >= 3 &&
		   ((name[0] >= 'a' && name[0] <= 'z') ||
			(name[0] >= 'A' && name[0] <= 'Z')) &&
		   name[1] == ':' &&
		   IsPathSeparator(name[2]);
#else
	return IsPathSeparator(name[0]);
#endif
}

// Returns a pathname for a file that does not currently exist. The pathname
// will be directory/base_name.extension or
// directory/base_name_<number>.extension if directory/base_name.extension
// already exists. The number will be incremented until a pathname is found
// that does not already exist.
// Examples: 'dir/foo_test.xml' or 'dir/foo_test_1.xml'.
// There could be a race condition if two or more processes are calling this
// function at the same time -- they could both pick the same filename.
FilePath FilePath::GenerateUniqueFileName(const FilePath& directory,
										  const FilePath& base_name,
										  const char* extension)
{
	FilePath full_pathname;
	int number = 0;
	do
	{
		full_pathname.Set(MakeFileName(directory, base_name, number++, extension));
	} while (full_pathname.FileOrDirectoryExists());
	return full_pathname;
}

// Returns true if FilePath ends with a path separator, which indicates that
// it is intended to represent a directory. Returns false otherwise.
// This does NOT check that a directory (or file) actually exists.
bool FilePath::IsDirectory() const
{
	return !pathname_.empty() &&
		   IsPathSeparator(pathname_.c_str()[pathname_.length() - 1]);
}

// Create directories so that path exists. Returns true if successful or if
// the directories already exist; returns false if unable to create directories
// for any reason.
bool FilePath::CreateDirectoriesRecursively() const
{
	if (!this->IsDirectory())
	{
		return false;
	}

	if (pathname_.length() == 0 || this->DirectoryExists())
	{
		return true;
	}

	const FilePath parent(this->RemoveTrailingPathSeparator().RemoveFileName());
	return parent.CreateDirectoriesRecursively() && this->CreateFolder();
}

// Create the directory so that path exists. Returns true if successful or
// if the directory already exists; returns false if unable to create the
// directory for any reason, including if the parent directory does not
// exist. Not named "CreateDirectory" because that's a macro on Windows.
bool FilePath::CreateFolder() const
{
#if GTEST_OS_WINDOWS_MOBILE
	FilePath removed_sep(this->RemoveTrailingPathSeparator());
	LPCWSTR unicode = String::AnsiToUtf16(removed_sep.c_str());
	int result = CreateDirectory(unicode, NULL) ? 0 : -1;
	delete[] unicode;
#elif GTEST_OS_WINDOWS
	int result = _mkdir(pathname_.c_str());
#else
	int result = mkdir(pathname_.c_str(), 0777);
#endif  // GTEST_OS_WINDOWS_MOBILE

	if (result == -1)
	{
		return this->DirectoryExists();  // An error is OK if the directory exists.
	}
	return true;  // No error.
}

// If input name has a trailing separator character, remove it and return the
// name, otherwise return the name string unmodified.
// On Windows platform, uses \ as the separator, other platforms use /.
FilePath FilePath::RemoveTrailingPathSeparator() const
{
	return IsDirectory()
			   ? FilePath(pathname_.substr(0, pathname_.length() - 1))
			   : *this;
}

// Removes any redundant separators that might be in the pathname.
// For example, "bar///foo" becomes "bar/foo". Does not eliminate other
// redundancies that might be in a pathname involving "." or "..".
// TODO(wan@google.com): handle Windows network shares (e.g. \\server\share).
void FilePath::Normalize()
{
	if (pathname_.c_str() == NULL)
	{
		pathname_ = "";
		return;
	}
	const char* src = pathname_.c_str();
	char* const dest = new char[pathname_.length() + 1];
	char* dest_ptr = dest;
	memset(dest_ptr, 0, pathname_.length() + 1);

	while (*src != '\0')
	{
		*dest_ptr = *src;
		if (!IsPathSeparator(*src))
		{
			src++;
		}
		else
		{
#if GTEST_HAS_ALT_PATH_SEP_
			if (*dest_ptr == kAlternatePathSeparator)
			{
				*dest_ptr = kPathSeparator;
			}
#endif
			while (IsPathSeparator(*src))
				src++;
		}
		dest_ptr++;
	}
	*dest_ptr = '\0';
	pathname_ = dest;
	delete[] dest;
}

}  // namespace internal
}  // namespace testing
