/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */

#ifndef PLATFORM_MISC_H
#define PLATFORM_MISC_H

#include <string>
#include <vector>

namespace Platform
{

/**
 * Returns the path to the original PWD/CWD dir from where the user started the execution.
 * For security reasons we change the CWD to Spring's write-dir (most of the time it's the home-dir), so we need to cache the PWD/CWD.
 * @return path to the CWD, with trailing path separator
 */
const std::string& GetOrigCWD();
const std::string& SetOrigCWD();

/**
 * Returns the path to the current users dir for storing application settings.
 * examples:
 * - "/home/pablo"
 * - "/root"
 * - "C:\Users\USER\AppData\Local"
 * - "C:\Users\USER\Local Settings\Application Data"
 * - "C:\Documents and Settings\USER\Local Settings\App Data"
 * - "C:\Dokumente und Einstellungen\USER\Anwendungsdaten"
 * @return path to the current users home dir, without trailing path separator
 */
std::string GetUserDir();

/**
 * Returns the path to the main binary of the running process,
 * including the file name.
 * examples:
 * examples when calling from the engine:
 * - "/usr/games/bin/spring"
 * - "/home/user/spring/spring"
 * - "C:\Program Files\Spring\spring.exe"
 * examples when calling from the synchronization library:
 * - "/usr/games/bin/springlobby"
 * - "/home/user/springlobby/springlobby"
 * - "C:\Program Files\SpringLobby\springlobby.exe"
 * @return path to the main binary of the running process file or ""
 */
std::string GetProcessExecutableFile();

/**
 * Returns the path to the main binary of the running process,
 * excluding the file name.
 * @see GetProcessExecutableFile()
 * @return path to the main binary of the running process dir or ""
 */
std::string GetProcessExecutablePath();

/**
 * Returns the path to the module/shared library, including the file name.
 * If moduleName is "", the path to the current library is returned.
 * examples when calling from the engine:
 * - "/usr/games/bin/spring"
 * - "/home/user/spring/spring"
 * - "C:\Program Files\Spring\spring.exe"
 * examples when calling from the synchronization library:
 * - "/usr/lib/libunitsync.so"
 * - "/home/user/spring/libunitsync.so"
 * - "C:\Program Files\Spring\unitsync.dll"
 * @param  moduleName eg. "spring" or "unitsync", "" for current
 * @return path to the current module file or ""
 */
std::string GetModuleFile(std::string moduleName = "");

/**
 * Returns the path to a module/shared library, excluding the file name.
 * If moduleName is "", the path to the current library is returned.
 * @see GetModuleFile()
 * @param  moduleName eg. "spring" or "unitsync", "" for current
 * @return path to the current module dir (with trailing path separator) or ""
 */
std::string GetModulePath(const std::string& moduleName = "");

std::string GetOS();
std::string GetOSFamily();
std::string GetWordSizeStr();


bool Is64Bit();
bool Is32BitEmulation();
bool IsRunningInGDB();

uint64_t FreeDiskSpace(const std::string& path);
uint32_t NativeWordSize(); // compiled process code
uint32_t SystemWordSize(); // host operating system
uint32_t DequeChunkSize();


/**
 * Executes a native binary, file and args have to be not escaped!
 * http://linux.die.net/man/3/execvp
 * @param  file path to an executable, eg. "/usr/bin/games/spring"
 * @param  args arguments to the executable, eg. {"-f". "/tmp/test.txt"}
 * @return error message, or "" on success
 */
std::string ExecuteProcess(const std::string& file, std::vector<std::string> args, bool asSubprocess = false);
}

#endif // PLATFORM_MISC_H
