#pragma once

// Various differences between WIN32 and Linux.
#include "types_meta.h"		// mBOOL
#include "mreg.h"			// REG_CMD_FN, etc
#include "log_meta.h"		// LOG_ERROR, etc

// String describing platform/DLL-type, for matching lines in plugins.ini.
#ifdef _WIN32
	#define UNUSED		/**/

	#define PLATFORM	"mswin"
	#define PLATFORM_SPC	"win32"
	#define PLATFORM_DLEXT	".dll"
#else
	#define UNUSED		__attribute__((unused))

	#define PLATFORM	"linux"
	#define PLATFORM_SPC	"lin32"
	#define PLATFORM_DLEXT	".so"
#endif

// Special version that fixes vsnprintf bugs.
#ifndef DO_NOT_FIX_VARARG_ENGINE_API_WARPERS
int safe_vsnprintf(char* s,  size_t n,  const char *format, va_list ap);
int safe_snprintf(char* s, size_t n, const char* format, ...);
#endif
void safevoid_vsnprintf(char* s, size_t n, const char *format, va_list ap);
void safevoid_snprintf(char* s, size_t n, const char* format, ...);

// Functions & types for DLL open/close/etc operations.
extern mBOOL dlclose_handle_invalid;
#ifdef _WIN32
	typedef HINSTANCE DLHANDLE;
	typedef FARPROC DLFUNC;
	inline DLHANDLE DLOPEN(const char *filename)
	{
		return LoadLibraryA(filename);
	}
	inline DLFUNC DLSYM(DLHANDLE handle, const char *string)
	{
		return GetProcAddress(handle, string);
	}
	inline int DLCLOSE(DLHANDLE handle)
	{
		if (!handle)
		{
			dlclose_handle_invalid = mTRUE;
			return 1;
		}

		dlclose_handle_invalid = mFALSE;
		// NOTE: Windows FreeLibrary returns success=nonzero, fail=zero,
		// which is the opposite of the unix convention, thus the '!'.
		return !FreeLibrary(handle);
	}
	// Windows doesn't provide a function corresponding to dlerror(), so
	// we make our own.
	char *str_GetLastError();
	inline const char *DLERROR()
	{
		if (dlclose_handle_invalid)
			return "Invalid handle.";

		return str_GetLastError();
	}
#else
	typedef void *DLHANDLE;
	typedef void *DLFUNC;
	inline DLHANDLE DLOPEN(const char *filename)
	{
		return dlopen(filename, RTLD_NOW);
	}
	inline DLFUNC DLSYM(DLHANDLE handle, const char *string)
	{
		return dlsym(handle, string);
	}
	// dlclose crashes if handle is null.
	inline int DLCLOSE(DLHANDLE handle)
	{
		if (!handle)
		{
			dlclose_handle_invalid = mTRUE;
			return 1;
		}
		dlclose_handle_invalid = mFALSE;
		return dlclose(handle);
	}
	inline const char *DLERROR()
	{
		if (dlclose_handle_invalid)
			return "Invalid handle.";

		return dlerror();
	}
#endif

const char *DLFNAME(void *memptr);
mBOOL IS_VALID_PTR(void *memptr);

// Attempt to call the given function pointer, without segfaulting.
mBOOL os_safe_call(REG_CMD_FN pfn);


// Windows doesn't have an strtok_r() routine, so we write our own.
#ifdef _WIN32
	#define strtok_r(s, delim, ptrptr)	my_strtok_r(s, delim, ptrptr)
	char *my_strtok_r(char *s, const char *delim, char **ptrptr);
#else
// Linux doesn't have an strlwr() routine, so we write our own.
	#define strlwr(s) my_strlwr(s)
	char *my_strlwr(char *s);
#endif // _WIN32


// Set filename and pathname maximum lengths.  Note some windows compilers
// provide a <limits.h> which is incomplete and/or causes problems; see
// doc/windows_notes.txt for more information.
//
// Note that both OS's include room for null-termination:
//   linux:    "# chars in a path name including nul"
//   win32:    "note that the sizes include space for 0-terminator"
#ifdef linux
	#include <limits.h>
#elif defined(_WIN32)
	#include <stdlib.h>
	#define NAME_MAX	_MAX_FNAME
	#ifndef PATH_MAX
		#define PATH_MAX	_MAX_PATH
	#endif
#endif // _WIN32

// Various other windows routine differences.
#ifdef linux
	#include <unistd.h>	// sleep
	#ifndef O_BINARY
    		#define O_BINARY 0
	#endif
#elif defined(_WIN32)
	#include <io.h>
	#include <direct.h>

	#define sleep(x) Sleep(x*1000)

	// Fixed MSVC compiling, by Nikolay "The Storm" Baklicharov.
	#if defined(__GNUC__) || defined (_MSC_VER) && _MSC_VER >= 1400
		#define snprintf	_snprintf
		#define vsnprintf	_vsnprintf
		#define unlink		_unlink
		#define strlwr		_strlwr
		#define strdup		_strdup
		#define strcasecmp	_stricmp
		#define strncasecmp	_strnicmp
		#define getcwd		_getcwd
		#define open		_open
		#define read		_read
		#define write		_write
		#define close		_close
	#endif /* GCC or MSVC 8.0+ */
#endif // _WIN32

#if !defined WIN32 && !defined _MSC_VER
#include <unistd.h>	// getcwd
#endif

#include <sys/stat.h>
#ifndef S_ISREG
	// Linux gcc defines this; earlier mingw didn't, later mingw does;
	// MSVC doesn't seem to.
	#define S_ISREG(m)	((m) & S_IFREG)
#endif /* not S_ISREG */
#ifdef _WIN32
	// The following two are defined in mingw but not in MSVC
    #ifndef S_IRUSR
        #define S_IRUSR _S_IREAD
    #endif
    #ifndef S_IWUSR
        #define S_IWUSR _S_IWRITE
    #endif

	// The following two are defined neither in mingw nor in MSVC
    #ifndef S_IRGRP
        #define S_IRGRP S_IRUSR
    #endif
    #ifndef S_IWGRP
        #define S_IWGRP S_IWUSR
    #endif
#endif // _WIN32

// Normalize/standardize a pathname.
//  - For win32, this involves:
//    - Turning backslashes (\) into slashes (/), so that config files and
//      Metamod internal code can be simpler and just use slashes (/).
//    - Turning upper/mixed case into lowercase, since windows is
//      non-case-sensitive.
//  - For linux, this requires no work, as paths uses slashes (/) natively,
//    and pathnames are case-sensitive.
#ifdef linux
#define normalize_pathname(a)
#elif defined(_WIN32)
void normalize_pathname(char *path);
#endif // _WIN32

// Indicate if pathname appears to be an absolute-path.  Under linux this
// is a leading slash (/).  Under win32, this can be:
//  - a drive-letter path (ie "D:blah" or "C:\blah")
//  - a toplevel path (ie "\blah")
//  - a UNC network address (ie "\\srv1\blah").
// Also, handle both native and normalized pathnames.
inline mBOOL is_absolute_path(const char *path) {
	if (path[0]=='/') return mTRUE;
#ifdef _WIN32
	if (path[1]==':') return mTRUE;
	if (path[0]=='\\') return mTRUE;
#endif // _WIN32
	return mFALSE;
}

#ifdef _WIN32
// Buffer pointed to by resolved_name is assumed to be able to store a
// string of PATH_MAX length.
char *realpath(const char *file_name, char *resolved_name);
#endif // _WIN32

// Generic "error string" from a recent OS call.  For linux, this is based
// on errno.  For win32, it's based on GetLastError.
inline const char *str_os_error()
{
#ifdef _WIN32
	return str_GetLastError();
#else
	return strerror(errno);
#endif
}