/*****************************************************************************
The Dark Mod GPL Source Code

This file is part of the The Dark Mod Source Code, originally based
on the Doom 3 GPL Source Code as published in 2011.

The Dark Mod Source Code is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version. For details, see LICENSE.TXT.

Project: The Dark Mod (http://www.thedarkmod.com/)

******************************************************************************/
#pragma once

#include <cstdint>
#include <string>
#include <vector>

class Fl_Window;

class OsUtils {
	static std::string _argv0;
public:

	//pass information about command line
	//must be called into order to use ResetCwd and GetExecutableName
	static void InitArgs(const char *argv0);

	//returns absolute path to current executable
	//it is extracted from argv[0], set by InitArgs
	static std::string GetExecutablePath();
	//returns directory where current executable is located
	//it is extracted from argv[0], set by InitArgs
	static std::string GetExecutableDir();
	//returns filename of the current executable
	//it is extracted from argv[0], set by InitArgs
	static std::string GetExecutableName();

	//change working directory to the location of the launched executable
	//location is taken from argv[0], set by InitArgs
	static bool SetCwd(const std::string &newCwd);
	//returns current working directory
	static std::string GetCwd();

	//chmod file to be executable (NOP on Windows)
	static void MarkAsExecutable(const std::string &filePath);

	//used for self-update of the installer
	//runs batch/shell script which:
	//  1) deletes targetPath file
	//  2) renames temporaryPath to targetPath
	//  3) starts targetPath as executable
	//note: if temporaryPath is empty, then steps 1 and 2 are omitted
	static void ReplaceAndRestartExecutable(const std::string &targetPath, const std::string &temporaryPath, const std::vector<std::string> &cmdArgs = {});
	//returns name of batch file (for deleting it)
	static std::string GetBatchForReplaceAndRestartExecutable(const std::string &targetPath);

	//return number of bytes available at path
	static uint64_t GetAvailableDiskSpace(const std::string &path);

	//is current process run "under admin"?
	//returns false on Non-Windows platforms
	static bool HasElevatedPrivilegesWindows();
	//checks if the specified set of files can be modified (i.e. not locked by running process)
	//returns error message on fail, or empty string if all files are modifiable
	static std::string CanModifyFiles(const std::vector<std::string> &filePaths, bool skipMissing);

	//return true if TDM shortcut already exists on Desktop
	static bool IfShortcutExists(const std::string &name);
	struct ShortcutInfo {
		std::string workingDirPath;		//relative to GetCwd()
		std::string executablePath;		//relative to workingDirPath
		std::string arguments;			//cmd args (all in one string)
		std::string name;				//name as seen on desktop
		std::string iconPath;			//relative to workingDirPath
		std::string comment;
	};
	//creates (possibly overwrites) TDM shortcut on Desktop
	static void CreateShortcut(ShortcutInfo info);

	//updates given progress ratio on taskbar icon of the specified window
	//note: passing exactly 1.0 or -1.0 hides progress indicator
	static void ShowSystemProgress(const Fl_Window* window, double ratio);
};