// 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
