/*
 * mptPathString.h
 * ---------------
 * Purpose: Wrapper class around the platform-native representation of path names. Should be the only type that is used to store path names.
 * Notes  : Currently none.
 * Authors: OpenMPT Devs
 * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
 */


#pragma once

#include "BuildSettings.h"

#include <vector>

#include "FlagSet.h"

OPENMPT_NAMESPACE_BEGIN



#define MPT_DEPRECATED_PATH
//#define MPT_DEPRECATED_PATH [[deprecated]]



namespace mpt
{

#if MPT_OS_WINDOWS
typedef mpt::winstring RawPathString;
#else // !MPT_OS_WINDOWS
typedef std::string RawPathString;
#endif // if MPT_OS_WINDOWS



class PathString
{

private:

	RawPathString path;

private:

	explicit PathString(const RawPathString & path)
		: path(path)
	{
		return;
	}

public:

	PathString()
	{
		return;
	}
	PathString(const PathString & other)
		: path(other.path)
	{
		return;
	}
	PathString & assign(const PathString & other)
	{
		path = other.path;
		return *this;
	}
	PathString & operator = (const PathString & other)
	{
		return assign(other);
	}
	PathString & append(const PathString & other)
	{
		path.append(other.path);
		return *this;
	}
	PathString & operator += (const PathString & other)
	{
		return append(other);
	}

	friend PathString operator + (const PathString & a, const PathString & b)
	{
		return PathString(a).append(b);
	}

	friend bool operator < (const PathString & a, const PathString & b)
	{
		return a.AsNative() < b.AsNative();
	}
	friend bool operator == (const PathString & a, const PathString & b)
	{
		return a.AsNative() == b.AsNative();
	}
	friend bool operator != (const PathString & a, const PathString & b)
	{
		return a.AsNative() != b.AsNative();
	}

	bool empty() const { return path.empty(); }

	std::size_t Length() const { return path.size(); }



public:

#if MPT_OS_WINDOWS
#if !MPT_OS_WINDOWS_WINRT
	static int CompareNoCase(const PathString & a, const PathString & b);
#endif // !MPT_OS_WINDOWS_WINRT
#endif

#if MPT_OS_WINDOWS && (defined(MPT_ENABLE_DYNBIND) || defined(MPT_ENABLE_TEMPFILE))

	void SplitPath(PathString *drive, PathString *dir, PathString *fname, PathString *ext) const;
	// \\?\ prefixes will be removed and \\?\\UNC prefixes converted to canonical \\ form.
	PathString GetDrive() const;		// Drive letter + colon, e.g. "C:" or \\server\\share
	PathString GetDir() const;			// Directory, e.g. "\OpenMPT\"
	PathString GetPath() const;			// Drive + Dir, e.g. "C:\OpenMPT\"
	PathString GetFileName() const;		// File name without extension, e.g. "OpenMPT"
	PathString GetFileExt() const;		// Extension including dot, e.g. ".exe"
	PathString GetFullFileName() const;	// File name + extension, e.g. "OpenMPT.exe"

	// Verify if this path represents a valid directory on the file system.
	bool IsDirectory() const;
	// Verify if this path exists and is a file on the file system.
	bool IsFile() const;

#endif // MPT_OS_WINDOWS && (MPT_ENABLE_DYNBIND || MPT_ENABLE_TEMPFILE)

#if defined(MODPLUG_TRACKER) && MPT_OS_WINDOWS

	bool FileOrDirectoryExists() const;

#endif // MODPLUG_TRACKER && MPT_OS_WINDOWS

	static bool IsPathSeparator(RawPathString::value_type c);
	static RawPathString::value_type GetDefaultPathSeparator();

#if defined(MODPLUG_TRACKER) && MPT_OS_WINDOWS

	// Return the same path string with a different (or appended) extension (including "."), e.g. "foo.bar",".txt" -> "foo.txt" or "C:\OpenMPT\foo",".txt" -> "C:\OpenMPT\foo.txt"
	PathString ReplaceExt(const mpt::PathString &newExt) const;

	// Removes special characters from a filename component and replaces them with a safe replacement character ("_" on windows).
	// Returns the result.
	// Note that this also removes path component separators, so this should only be used on single-component PathString objects.
	PathString SanitizeComponent() const;

	bool HasTrailingSlash() const
	{
		if(path.empty())
		{
			return false;
		}
		RawPathString::value_type c = path[path.length() - 1];
		return IsPathSeparator(c);
	}
	mpt::PathString &EnsureTrailingSlash()
	{
		if(!path.empty() && !HasTrailingSlash())
		{
			path += GetDefaultPathSeparator();
		}
		return *this;
	}

	mpt::PathString WithoutTrailingSlash() const
	{
		mpt::PathString result = *this;
		while(result.HasTrailingSlash())
		{
			if(result.Length() == 1)
			{
				return result;
			}
			result = mpt::PathString(result.AsNative().substr(0, result.AsNative().length() - 1));
		}
		return result;
	}

	mpt::PathString WithTrailingSlash() const
	{
		mpt::PathString result = *this;
		result.EnsureTrailingSlash();
		return result;
	}

	// Relative / absolute paths conversion
	mpt::PathString AbsolutePathToRelative(const mpt::PathString &relativeTo) const;
	mpt::PathString RelativePathToAbsolute(const mpt::PathString &relativeTo) const;

#endif // MODPLUG_TRACKER && MPT_OS_WINDOWS

public:

#if MPT_OS_WINDOWS

#if !(MPT_WSTRING_CONVERT)
#error "mpt::PathString on Windows depends on MPT_WSTRING_CONVERT)"
#endif
	// conversions
#if defined(MPT_ENABLE_CHARSET_LOCALE)
	MPT_DEPRECATED_PATH std::string ToLocale() const { return mpt::ToCharset(mpt::Charset::Locale, path); }
#endif
	std::string ToUTF8() const { return mpt::ToCharset(mpt::Charset::UTF8, path); }
	std::wstring ToWide() const { return mpt::ToWide(path); }
	mpt::ustring ToUnicode() const { return mpt::ToUnicode(path); }
#if defined(MPT_ENABLE_CHARSET_LOCALE)
	MPT_DEPRECATED_PATH static PathString FromLocale(const std::string &path) { return PathString(mpt::ToWin(mpt::Charset::Locale, path)); }
	static PathString FromLocaleSilent(const std::string &path) { return PathString(mpt::ToWin(mpt::Charset::Locale, path)); }
#endif
	static PathString FromUTF8(const std::string &path) { return PathString(mpt::ToWin(mpt::Charset::UTF8, path)); }
	static PathString FromWide(const std::wstring &path) { return PathString(mpt::ToWin(path)); }
	static PathString FromUnicode(const mpt::ustring &path) { return PathString(mpt::ToWin(path)); }
	RawPathString AsNative() const { return path; }
	// Return native string, with possible \\?\ prefix if it exceeds MAX_PATH characters.
	RawPathString AsNativePrefixed() const;
	static PathString FromNative(const RawPathString &path) { return PathString(path); }
#if defined(MPT_WITH_MFC)
	// CString TCHAR, so this is CHAR or WCHAR, depending on UNICODE
	CString ToCString() const { return mpt::ToCString(path); }
	static PathString FromCString(const CString &path) { return PathString(mpt::ToWin(path)); }
#endif // MPT_WITH_MFC

	// Convert a path to its simplified form, i.e. remove ".\" and "..\" entries
	mpt::PathString Simplify() const;

#else // !MPT_OS_WINDOWS

	// conversions
#if defined(MPT_ENABLE_CHARSET_LOCALE)
	std::string ToLocale() const { return path; }
	std::string ToUTF8() const { return mpt::ToCharset(mpt::Charset::UTF8, mpt::Charset::Locale, path); }
#if MPT_WSTRING_CONVERT
	std::wstring ToWide() const { return mpt::ToWide(mpt::Charset::Locale, path); }
#endif
	mpt::ustring ToUnicode() const { return mpt::ToUnicode(mpt::Charset::Locale, path); }
	static PathString FromLocale(const std::string &path) { return PathString(path); }
	static PathString FromLocaleSilent(const std::string &path) { return PathString(path); }
	static PathString FromUTF8(const std::string &path) { return PathString(mpt::ToCharset(mpt::Charset::Locale, mpt::Charset::UTF8, path)); }
#if MPT_WSTRING_CONVERT
	static PathString FromWide(const std::wstring &path) { return PathString(mpt::ToCharset(mpt::Charset::Locale, path)); }
#endif
	static PathString FromUnicode(const mpt::ustring &path) { return PathString(mpt::ToCharset(mpt::Charset::Locale, path)); }
	RawPathString AsNative() const { return path; }
	RawPathString AsNativePrefixed() const { return path; }
	static PathString FromNative(const RawPathString &path) { return PathString(path); }
#else // !MPT_ENABLE_CHARSET_LOCALE
	std::string ToUTF8() const { return path; }
#if MPT_WSTRING_CONVERT
	std::wstring ToWide() const { return mpt::ToWide(mpt::Charset::UTF8, path); }
#endif
	mpt::ustring ToUnicode() const { return mpt::ToUnicode(mpt::Charset::UTF8, path); }
	static PathString FromUTF8(const std::string &path) { return PathString(path); }
#if MPT_WSTRING_CONVERT
	static PathString FromWide(const std::wstring &path) { return PathString(mpt::ToCharset(mpt::Charset::UTF8, path)); }
#endif
	static PathString FromUnicode(const mpt::ustring &path) { return PathString(mpt::ToCharset(mpt::Charset::UTF8, path)); }
	RawPathString AsNative() const { return path; }
	RawPathString AsNativePrefixed() const { return path; }
	static PathString FromNative(const RawPathString &path) { return PathString(path); }
#endif // MPT_ENABLE_CHARSET_LOCALE

	// Convert a path to its simplified form (currently only implemented on Windows)
	[[deprecated]] mpt::PathString Simplify() const { return PathString(path); }

#endif // MPT_OS_WINDOWS

};



#if defined(MPT_ENABLE_CHARSET_LOCALE)
#if MPT_OS_WINDOWS
#ifdef UNICODE
[[deprecated]] inline std::string ToString(const mpt::PathString & x) { return mpt::ToCharset(mpt::Charset::Locale, x.ToUnicode()); }
#else
MPT_DEPRECATED_PATH inline std::string ToString(const mpt::PathString & x) { return mpt::ToCharset(mpt::Charset::Locale, x.AsNative()); }
#endif
#else
MPT_DEPRECATED_PATH inline std::string ToString(const mpt::PathString & x) { return mpt::ToCharset(mpt::Charset::Locale, x.ToUnicode()); }
#endif
#endif
inline mpt::ustring ToUString(const mpt::PathString & x) { return x.ToUnicode(); }
#if MPT_WSTRING_FORMAT
inline std::wstring ToWString(const mpt::PathString & x) { return x.ToWide(); }
#endif

} // namespace mpt

#if MPT_OS_WINDOWS

#ifdef UNICODE
#define MPT_PATHSTRING_LITERAL(x) ( L ## x )
#define MPT_PATHSTRING(x) mpt::PathString::FromNative( L ## x )
#else
#define MPT_PATHSTRING_LITERAL(x) ( x )
#define MPT_PATHSTRING(x) mpt::PathString::FromNative( x )
#endif

#else // !MPT_OS_WINDOWS

#define MPT_PATHSTRING_LITERAL(x) ( x )
#define MPT_PATHSTRING(x) mpt::PathString::FromNative( x )

#endif // MPT_OS_WINDOWS

#define PC_(x) MPT_PATHSTRING_LITERAL(x)
#define PL_(x) MPT_PATHSTRING_LITERAL(x)
#define P_(x) MPT_PATHSTRING(x)

namespace mpt
{


bool PathIsAbsolute(const mpt::PathString &path);

#if MPT_OS_WINDOWS

#if !(MPT_OS_WINDOWS_WINRT && (_WIN32_WINNT < 0x0a00))

// Returns the absolute path for a potentially relative path and removes ".." or "." components. (same as GetFullPathNameW)
mpt::PathString GetAbsolutePath(const mpt::PathString &path);

#endif

#ifdef MODPLUG_TRACKER

// Deletes a complete directory tree. Handle with EXTREME care.
// Returns false if any file could not be removed and aborts as soon as it
// encounters any error. path must be absolute.
bool DeleteWholeDirectoryTree(mpt::PathString path);

#endif // MODPLUG_TRACKER

#endif // MPT_OS_WINDOWS

#if MPT_OS_WINDOWS

#if defined(MPT_ENABLE_DYNBIND) || defined(MPT_ENABLE_TEMPFILE)

// Returns the application executable path or an empty string (if unknown), e.g. "C:\mptrack\"
mpt::PathString GetExecutablePath();

#endif // MPT_ENABLE_DYNBIND || MPT_ENABLE_TEMPFILE

#if defined(MPT_ENABLE_DYNBIND)

#if !MPT_OS_WINDOWS_WINRT
// Returns the system directory path, e.g. "C:\Windows\System32\"
mpt::PathString GetSystemPath();
#endif // !MPT_OS_WINDOWS_WINRT

#endif // MPT_ENABLE_DYNBIND

#endif // MPT_OS_WINDOWS

#if defined(MPT_ENABLE_TEMPFILE)
#if MPT_OS_WINDOWS

// Returns temporary directory (with trailing backslash added) (e.g. "C:\TEMP\")
mpt::PathString GetTempDirectory();

// Returns a new unique absolute path.
mpt::PathString CreateTempFileName(const mpt::PathString &fileNamePrefix = mpt::PathString(), const mpt::PathString &fileNameExtension = P_("tmp"));



// Scoped temporary file guard. Deletes the file when going out of scope.
// The file itself is not created automatically.
class TempFileGuard
{
private:
	const mpt::PathString filename;
public:
	TempFileGuard(const mpt::PathString &filename = CreateTempFileName());
	mpt::PathString GetFilename() const;
	~TempFileGuard();
};

#ifdef MODPLUG_TRACKER

// Scoped temporary directory guard. Deletes the directory when going out of scope.
// The directory itself is created automatically.
class TempDirGuard
{
private:
	mpt::PathString dirname;
public:
	TempDirGuard(const mpt::PathString &dirname_ = CreateTempFileName());
	mpt::PathString GetDirname() const;
	~TempDirGuard();
};

#endif // MODPLUG_TRACKER

#endif // MPT_OS_WINDOWS
#endif // MPT_ENABLE_TEMPFILE

} // namespace mpt



#if defined(MODPLUG_TRACKER)

// Sanitize a filename (remove special chars)
void SanitizeFilename(mpt::PathString &filename);

void SanitizeFilename(char *beg, char *end);
void SanitizeFilename(wchar_t *beg, wchar_t *end);

void SanitizeFilename(std::string &str);
void SanitizeFilename(std::wstring &str);
#if MPT_USTRING_MODE_UTF8
void SanitizeFilename(mpt::u8string &str);
#endif // MPT_USTRING_MODE_UTF8

template <std::size_t size>
void SanitizeFilename(char (&buffer)[size])
{
	static_assert(size > 0);
	SanitizeFilename(buffer, buffer + size);
}

template <std::size_t size>
void SanitizeFilename(wchar_t (&buffer)[size])
{
	static_assert(size > 0);
	SanitizeFilename(buffer, buffer + size);
}

#if defined(MPT_WITH_MFC)
void SanitizeFilename(CString &str);
#endif // MPT_WITH_MFC

#endif // MODPLUG_TRACKER


#if defined(MODPLUG_TRACKER)

enum FileTypeFormat
{
	FileTypeFormatNone           = 0   , // do not show extensions after description, i.e. "Foo Files"
	FileTypeFormatShowExtensions = 1<<0, // show extensions after descripten, i.e. "Foo Files (*.foo,*.bar)"
};
MPT_DECLARE_ENUM(FileTypeFormat)

class FileType
{
private:
	mpt::ustring m_ShortName; // "flac", "mod" (lowercase)
	mpt::ustring m_Description; // "FastTracker 2 Module"
	std::vector<std::string> m_MimeTypes; // "audio/ogg" (in ASCII)
	std::vector<mpt::PathString> m_Extensions; // "mod", "xm" (lowercase)
	std::vector<mpt::PathString> m_Prefixes; // "mod" for "mod.*"
public:
	FileType() { }
	FileType(const std::vector<FileType> &group)
	{
		for(const auto &type : group)
		{
			m_MimeTypes.insert(m_MimeTypes.end(), type.m_MimeTypes.begin(), type.m_MimeTypes.end());
			m_Extensions.insert(m_Extensions.end(), type.m_Extensions.begin(), type.m_Extensions.end());
			m_Prefixes.insert(m_Prefixes.end(), type.m_Prefixes.begin(), type.m_Prefixes.end());
		}
	}
	static FileType Any()
	{
		return FileType().ShortName(U_("*")).Description(U_("All Files")).AddExtension(P_("*"));
	}
public:
	FileType& ShortName(const mpt::ustring &shortName) { m_ShortName = shortName; return *this; }
	FileType& Description(const mpt::ustring &description) { m_Description = description; return *this; }
	FileType& MimeTypes(const std::vector<std::string> &mimeTypes) { m_MimeTypes = mimeTypes; return *this; }
	FileType& Extensions(const std::vector<mpt::PathString> &extensions) { m_Extensions = extensions; return *this; }
	FileType& Prefixes(const std::vector<mpt::PathString> &prefixes) { m_Prefixes = prefixes; return *this; }
	FileType& AddMimeType(const std::string &mimeType) { m_MimeTypes.push_back(mimeType); return *this; }
	FileType& AddExtension(const mpt::PathString &extension) { m_Extensions.push_back(extension); return *this; }
	FileType& AddPrefix(const mpt::PathString &prefix) { m_Prefixes.push_back(prefix); return *this; }
public:
	mpt::ustring GetShortName() const { return m_ShortName; }
	mpt::ustring GetDescription() const { return m_Description; }
	std::vector<std::string> GetMimeTypes() const { return m_MimeTypes; }
	std::vector<mpt::PathString> GetExtensions() const { return m_Extensions; }
	std::vector<mpt::PathString> GetPrefixes() const { return m_Prefixes; }
public:
	mpt::PathString AsFilterString(FlagSet<FileTypeFormat> format = FileTypeFormatNone) const;
	mpt::PathString AsFilterOnlyString() const;
}; // class FileType


// "Ogg Vorbis|*.ogg;*.oga|" // FileTypeFormatNone
// "Ogg Vorbis (*.ogg,*.oga)|*.ogg;*.oga|" // FileTypeFormatShowExtensions
mpt::PathString ToFilterString(const FileType &fileType, FlagSet<FileTypeFormat> format = FileTypeFormatNone);
mpt::PathString ToFilterString(const std::vector<FileType> &fileTypes, FlagSet<FileTypeFormat> format = FileTypeFormatNone);

// "*.ogg;*.oga" / ";*.ogg;*.oga"
mpt::PathString ToFilterOnlyString(const FileType &fileType, bool prependSemicolonWhenNotEmpty = false);
mpt::PathString ToFilterOnlyString(const std::vector<FileType> &fileTypes, bool prependSemicolonWhenNotEmpty = false);

#endif // MODPLUG_TRACKER


OPENMPT_NAMESPACE_END