/*
Copyright (C) 1996-1997 Id Software, Inc.

This program 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 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

//well, linux or cygwin (windows with posix emulation layer), anyway...

#define _GNU_SOURCE
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <dlfcn.h>
#include <dirent.h>
#ifndef __CYGWIN__
#include <sys/ipc.h>
#include <sys/shm.h>
#endif
#include <sys/stat.h>
#include <string.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <errno.h>
#ifndef __MACOSX__
#include <X11/Xlib.h>
#endif
#ifdef MULTITHREAD
#include <pthread.h>
#endif

#ifdef __CYGWIN__
#define USE_LIBTOOL
#endif
#ifdef USE_LIBTOOL
#include <ltdl.h>
#endif

#include "quakedef.h"

#undef malloc

int noconinput = 0;
int nostdout = 0;

qboolean isPlugin;
int sys_parentleft;
int sys_parenttop;
int sys_parentwidth;
int sys_parentheight;
long	sys_parentwindow;

qboolean X11_GetDesktopParameters(int *width, int *height, int *bpp, int *refreshrate);

char *basedir = "./";

qboolean Sys_InitTerminal (void)	//we either have one or we don't.
{
	return true;
}
void Sys_CloseTerminal (void)
{
}

void Sys_RecentServer(char *command, char *target, char *title, char *desc)
{
}

#ifndef CLIENTONLY
qboolean isDedicated;
#endif
// =======================================================================
// General routines
// =======================================================================

#if 1
static int ansiremap[8] = {0, 4, 2, 6, 1, 5, 3, 7};
static void ApplyColour(unsigned int chr)
{
	static int oldchar = CON_WHITEMASK;
	int bg, fg;
	chr &= CON_FLAGSMASK;

	if (oldchar == chr)
		return;
	oldchar = chr;

	printf("\e[0;"); // reset

	if (chr & CON_BLINKTEXT)
		printf("5;"); // set blink

	bg = (chr & CON_BGMASK) >> CON_BGSHIFT;
	fg = (chr & CON_FGMASK) >> CON_FGSHIFT;

	// don't handle intensive bit for background
	// as terminals differ too much in displaying \e[1;7;3?m
	bg &= 0x7;

	if (chr & CON_NONCLEARBG)
	{
		if (fg & 0x8) // intensive bit set for foreground
		{
			printf("1;"); // set bold/intensity ansi flag
			fg &= 0x7; // strip intensive bit
		}

		// set foreground and background colors
		printf("3%i;4%im", ansiremap[fg], ansiremap[bg]);
	}
	else
	{
		switch(fg)
		{
		//to get around wierd defaults (like a white background) we have these special hacks for colours 0 and 7
		case COLOR_BLACK:
			printf("7m"); // set inverse
			break;
		case COLOR_GREY:
			printf("1;30m"); // treat as dark grey
			break;
		case COLOR_WHITE:
			printf("m"); // set nothing else
			break;
		default:
			if (fg & 0x8) // intensive bit set for foreground
			{
				printf("1;"); // set bold/intensity ansi flag
				fg &= 0x7; // strip intensive bit
			}

			printf("3%im", ansiremap[fg]); // set foreground
			break;
		}
	}
}

#include <wchar.h>
void Sys_Printf (char *fmt, ...)
{
	va_list		argptr;
	char		text[2048];
	conchar_t	ctext[2048];
	conchar_t       *c, *e;
	wchar_t		w;

	if (nostdout)
		return;

	va_start (argptr,fmt);
	vsnprintf (text,sizeof(text)-1, fmt,argptr);
	va_end (argptr);

	if (strlen(text) > sizeof(text))
		Sys_Error("memory overwrite in Sys_Printf");

	e = COM_ParseFunString(CON_WHITEMASK, text, ctext, sizeof(ctext), false);

	for (c = ctext; c < e; c++)
	{
		if (*c & CON_HIDDEN)
			continue;

		ApplyColour(*c);
		w = *c & 0x0ffff;
		if (w >= 0xe000 && w < 0xe100)
		{
			/*not all quake chars are ascii compatible, so map those control chars to safe ones so we don't mess up anyone's xterm*/
			if ((w & 0x7f) > 0x20)
				putc(w&0x7f, stdout);
			else if (w & 0x80)
			{
				static char tab[32] = "---#@.@@@@ # >.." "[]0123456789.---";
				putc(tab[w&31], stdout);
			}
			else
			{
				static char tab[32] = ".####.#### # >.." "[]0123456789.---";
				putc(tab[w&31], stdout);
			}
		}
		else if (w < ' ' && w != '\t' && w != '\r' && w != '\n')
			putc('?', stdout);	//don't let anyone print escape codes or other things that could crash an xterm.
		else
		{
			/*putwc doesn't like me. force it in utf8*/
			if (w >= 0x80)
			{
				if (w > 0x800)
				{
					putc(0xe0 | ((w>>12)&0x0f), stdout);
					putc(0x80 | ((w>>6)&0x3f), stdout);
				}
				else
					putc(0xc0 | ((w>>6)&0x1f), stdout);
				putc(0x80 | (w&0x3f), stdout);
			}
			else
				putc(w, stdout);
		}
	}

	ApplyColour(CON_WHITEMASK);
}
#else
void Sys_Printf (char *fmt, ...)
{
	va_list		argptr;
	char		text[2048];
	unsigned char		*p;

	va_start (argptr,fmt);
	vsnprintf (text,sizeof(text)-1, fmt,argptr);
	va_end (argptr);

	if (strlen(text) > sizeof(text))
		Sys_Error("memory overwrite in Sys_Printf");

	if (nostdout)
		return;

	for (p = (unsigned char *)text; *p; p++)
		if ((*p > 128 || *p < 32) && *p != 10 && *p != 13 && *p != 9)
			printf("[%02x]", *p);
		else
			putc(*p, stdout);
}
#endif

void Sys_Quit (void)
{
	Host_Shutdown();
	fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);

#ifdef USE_LIBTOOL
	lt_dlexit();
#endif
	exit(0);
}

void Sys_Init(void)
{
}
void Sys_Shutdown(void)
{
}

void Sys_Error (const char *error, ...)
{
	va_list argptr;
	char string[1024];

// change stdin to non blocking
	fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);

	va_start (argptr,error);
	vsnprintf (string,sizeof(string)-1, error,argptr);
	va_end (argptr);
	fprintf(stderr, "Error: %s\n", string);

	Host_Shutdown ();
#ifdef USE_LIBTOOL
	lt_dlexit();
#endif
	exit (1);
}

void Sys_Warn (char *warning, ...)
{
	va_list argptr;
	char string[1024];

	va_start (argptr,warning);
	vsnprintf (string,sizeof(string)-1, warning,argptr);
	va_end (argptr);

	fprintf(stderr, "Warning: %s", string);
}

/*
============
Sys_FileTime

returns -1 if not present
============
*/
int	Sys_FileTime (char *path)
{
	struct	stat	buf;

	if (stat (path,&buf) == -1)
		return -1;

	return buf.st_mtime;
}


void Sys_mkdir (char *path)
{
	mkdir (path, 0777);
}

qboolean Sys_remove (char *path)
{
	return system(va("rm \"%s\"", path));
}
qboolean Sys_Rename (char *oldfname, char *newfname)
{
	return !rename(oldfname, newfname);
}

int Sys_FileOpenRead (char *path, int *handle)
{
	int h;
	struct stat fileinfo;

	h = open (path, O_RDONLY, 0666);
	*handle = h;
	if (h == -1)
		return -1;

	if (fstat (h,&fileinfo) == -1)
		Sys_Error ("Error fstating %s", path);

	return fileinfo.st_size;
}

int Sys_FileOpenWrite (char *path)
{
	int handle;

	umask (0);

	handle = open(path,O_RDWR | O_CREAT | O_TRUNC, 0666);

	if (handle == -1)
		Sys_Error ("Error opening %s: %s", path,strerror(errno));

	return handle;
}

int Sys_FileWrite (int handle, void *src, int count)
{
	return write (handle, src, count);
}

void Sys_FileClose (int handle)
{
	close (handle);
}

void Sys_FileSeek (int handle, int position)
{
	lseek (handle, position, SEEK_SET);
}

int Sys_FileRead (int handle, void *dest, int count)
{
	return read (handle, dest, count);
}

int Sys_DebugLog(char *file, char *fmt, ...)
{
	va_list argptr;
	static char data[1024];
	int fd;
	size_t result;

	va_start(argptr, fmt);
	vsnprintf (data,sizeof(data)-1, fmt, argptr);
	va_end(argptr);

	if (strlen(data) > sizeof(data))
		Sys_Error("Sys_DebugLog's buffer was stomped\n");

//	fd = open(file, O_WRONLY | O_BINARY | O_CREAT | O_APPEND, 0666);
	fd = open(file, O_WRONLY | O_CREAT | O_APPEND, 0666);
	if (fd)
	{
		result = write(fd, data, strlen(data)); // do something with result

		if (result != strlen(data))
			Con_SafePrintf("Sys_DebugLog() write: Filename: %s, expected %lu, result was %lu (%s)\n",file,(unsigned long)strlen(data),(unsigned long)result,strerror(errno));

		close(fd);
		return 0;
	}
	return 1;
}

int Sys_EnumerateFiles (const char *gpath, const char *match, int (*func)(const char *, qofs_t, void *, searchpathfuncs_t *), void *parm, searchpathfuncs_t *spath)
{
	DIR *dir;
	char apath[MAX_OSPATH];
	char file[MAX_OSPATH];
	char truepath[MAX_OSPATH];
	char *s;
	struct dirent *ent;
	struct stat st;

//printf("path = %s\n", gpath);
//printf("match = %s\n", match);

	if (!gpath)
		gpath = "";
	*apath = '\0';

	Q_strncpyz(apath, match, sizeof(apath));
	for (s = apath+strlen(apath)-1; s >= apath; s--)
	{
		if (*s == '/')
		{
			s[1] = '\0';
			match += s - apath+1;
			break;
		}
	}
	if (s < apath)	//didn't find a '/'
		*apath = '\0';

	Q_snprintfz(truepath, sizeof(truepath), "%s/%s", gpath, apath);


//printf("truepath = %s\n", truepath);
//printf("gamepath = %s\n", gpath);
//printf("apppath = %s\n", apath);
//printf("match = %s\n", match);
	dir = opendir(truepath);
	if (!dir)
	{
		Con_DPrintf("Failed to open dir %s\n", truepath);
		return true;
	}
	do
	{
		ent = readdir(dir);
		if (!ent)
			break;
		if (*ent->d_name != '.')
		{
			if (wildcmp(match, ent->d_name))
			{
				Q_snprintfz(file, sizeof(file), "%s/%s", truepath, ent->d_name);

				if (stat(file, &st) == 0)
				{
					Q_snprintfz(file, sizeof(file), "%s%s%s", apath, ent->d_name, S_ISDIR(st.st_mode)?"/":"");

					if (!func(file, st.st_size, parm, spath))
					{
						Con_DPrintf("giving up on search after finding %s\n", file);
						closedir(dir);
						return false;
					}
				}
				else
					printf("Stat failed for \"%s\"\n", file);
			}
		}
	} while(1);
	closedir(dir);

	return true;
}


int secbase;

double Sys_DoubleTime (void)
{
	struct timeval tp;
	struct timezone tzp;

	gettimeofday(&tp, &tzp);

	if (!secbase)
	{
		secbase = tp.tv_sec;
		return tp.tv_usec/1000000.0;
	}

	return (tp.tv_sec - secbase) + tp.tv_usec/1000000.0;
}

unsigned int Sys_Milliseconds (void)
{
	return Sys_DoubleTime() * 1000;
}

#ifdef USE_LIBTOOL
void Sys_CloseLibrary(dllhandle_t *lib)
{
	lt_dlclose((void*)lib);
}

dllhandle_t *Sys_LoadLibrary(const char *name, dllfunction_t *funcs)
{
	int i;
	dllhandle_t lib;

	lib = NULL;
	if (!lib)
		lib = lt_dlopenext (name);
	if (!lib)
	{
		Con_DPrintf("%s: %s\n", name, lt_dlerror());
		return NULL;
	}

	if (funcs)
	{
		for (i = 0; funcs[i].name; i++)
		{
			*funcs[i].funcptr = lt_dlsym(lib, funcs[i].name);
			if (!*funcs[i].funcptr)
				break;
		}
		if (funcs[i].name)
		{
			Con_DPrintf("Unable to find symbol \"%s\" in \"%s\"\n", funcs[i].name, name);
			Sys_CloseLibrary((dllhandle_t*)lib);
			lib = NULL;
		}
	}

	return (dllhandle_t*)lib;
}

void *Sys_GetAddressForName(dllhandle_t *module, const char *exportname)
{
	if (!module)
		return NULL;
	return lt_dlsym(module, exportname);
}
#else
void Sys_CloseLibrary(dllhandle_t *lib)
{
	dlclose((void*)lib);
}

dllhandle_t *Sys_LoadLibrary(const char *name, dllfunction_t *funcs)
{
	int i;
	dllhandle_t lib;

	lib = NULL;
	if (!lib)
		lib = dlopen (name, RTLD_LAZY);
	if (!lib && !strstr(name, ".so"))
		lib = dlopen (va("%s.so", name), RTLD_LAZY);
	if (!lib)
	{
		Con_DPrintf("%s\n", dlerror());
		return NULL;
	}

	if (funcs)
	{
		for (i = 0; funcs[i].name; i++)
		{
			*funcs[i].funcptr = dlsym(lib, funcs[i].name);
			if (!*funcs[i].funcptr)
				break;
		}
		if (funcs[i].name)
		{
			Con_DPrintf("Unable to find symbol \"%s\" in \"%s\"\n", funcs[i].name, name);
			Sys_CloseLibrary((dllhandle_t*)lib);
			lib = NULL;
		}
	}

	return (dllhandle_t*)lib;
}

void *Sys_GetAddressForName(dllhandle_t *module, const char *exportname)
{
	if (!module)
		return NULL;
	return dlsym(module, exportname);
}
#endif

// =======================================================================
//friendly way to crash, including stack traces. should help reduce gdb use.
#ifdef __linux__ /*should probably be GNUC but whatever*/
#include <execinfo.h>
#ifdef __i386__
#include <ucontext.h>
#endif
#ifdef DEBUG
void DumpGLState(void);
#endif
static void Friendly_Crash_Handler(int sig, siginfo_t *info, void *vcontext)
{
    int fd;
    void *array[64];
    size_t size;
    int firstframe = 0;
    char signame[32];

    switch(sig)
    {
    case SIGILL:    strcpy(signame, "SIGILL");  break;
    case SIGFPE:    strcpy(signame, "SIGFPE");  break;
    case SIGBUS:    strcpy(signame, "SIGBUS");  break;
    case SIGSEGV:   Q_snprintfz(signame, sizeof(signame), "SIGSEGV (%p)", info->si_addr);   break;
    default:    Q_snprintfz(signame, sizeof(signame), "%i", sig);   break;
    }

    // get void*'s for all entries on the stack
    size = backtrace(array, sizeof(array)/sizeof(array[0]));

#if defined(__i386__)
    //x86 signals don't leave the stack in a clean state, so replace the signal handler with the real crash address, and hide this function
    ucontext_t *uc = vcontext;
    array[1] = (void*)uc->uc_mcontext.gregs[REG_EIP];
    firstframe = 1;
#elif defined(__amd64__)
    //amd64 is sane enough, but this function and the libc signal handler are on the stack, and should be ignored.
    firstframe = 2;
#endif

    // print out all the frames to stderr
    fprintf(stderr, "Error: signal %s:\n", signame);
    backtrace_symbols_fd(array+firstframe, size-firstframe, 2);

    fd = open("crash.log", O_WRONLY|O_CREAT|O_APPEND, S_IRUSR | S_IWUSR | S_IRGRP);
    if (fd != -1)
    {
        time_t rawtime;
        struct tm * timeinfo;
        char buffer [80];

        time (&rawtime);
        timeinfo = localtime (&rawtime);
        strftime (buffer, sizeof(buffer), "Time: %Y-%m-%d %H:%M:%S\n",timeinfo);
        write(fd, buffer, strlen(buffer));

        Q_snprintfz(buffer, sizeof(buffer), "Binary: "__DATE__" "__TIME__"\n");
        write(fd, buffer, strlen(buffer));
        Q_snprintfz(buffer, sizeof(buffer), "Ver: %i.%02i%s\n", FTE_VER_MAJOR, FTE_VER_MINOR,
#ifdef OFFICIAL_RELEASE
            " (official)");
#else
            "");
#endif
        write(fd, buffer, strlen(buffer));
#ifdef SVNREVISION
        if (strcmp(STRINGIFY(SVNREVISION), "-"))
        {
            Q_snprintfz(buffer, sizeof(buffer), "Revision: %s\n", STRINGIFY(SVNREVISION));
            write(fd, buffer, strlen(buffer));
        }
#endif

        backtrace_symbols_fd(array + firstframe, size - firstframe, fd);
        write(fd, "\n", 1);
        close(fd);
    }
#ifdef DEBUG
	DumpGLState();
#endif
    exit(1);
}
#endif
// =======================================================================
// Sleeps for microseconds
// =======================================================================

static volatile int oktogo;

void alarm_handler(int x)
{
	oktogo=1;
}

char *Sys_ConsoleInput(void)
{
#if 1
	static char text[256];
	int len;

//	if (!qrenderer)
	{
		len = read (0, text, sizeof(text));
		if (len < 1)
			return NULL;

		text[len-1] = 0;    // rip off the /n and terminate

//Con_Printf("console input: %s\n", text);

		if (!strncmp(text, "vid_recenter ", 13))
		{
			Cmd_TokenizeString(text, false, false);
			sys_parentleft = strtoul(Cmd_Argv(1), NULL, 0);
			sys_parenttop = strtoul(Cmd_Argv(2), NULL, 0);
			sys_parentwidth = strtoul(Cmd_Argv(3), NULL, 0);
			sys_parentheight = strtoul(Cmd_Argv(4), NULL, 0);
			sys_parentwindow = strtoul(Cmd_Argv(5), NULL, 16);
		}

		return text;
	}
#endif
	return NULL;
}

int main (int c, const char **v)
{
	double time, oldtime, newtime;
	quakeparms_t parms;

//	char cwd[1024];
	char bindir[1024];

	signal(SIGFPE, SIG_IGN);
	signal(SIGPIPE, SIG_IGN);

	memset(&parms, 0, sizeof(parms));

#ifdef USE_LIBTOOL
	lt_dlinit();
#endif

	parms.argc = c;
	parms.argv = v;
	COM_InitArgv(parms.argc, parms.argv);
	TL_InitLanguages();

#ifdef __linux__
	if (!COM_CheckParm("-nodumpstack"))
	{
		struct sigaction act;
		memset(&act, 0, sizeof(act));
		act.sa_sigaction = Friendly_Crash_Handler;
		act.sa_flags = SA_SIGINFO | SA_RESTART;
		sigaction(SIGILL, &act, NULL);
		sigaction(SIGSEGV, &act, NULL);
		sigaction(SIGBUS, &act, NULL);
	}
#endif

	parms.basedir = basedir;
	memset(bindir, 0, sizeof(bindir));	//readlink does NOT null terminate, apparently.
#ifdef __linux__
	//attempt to figure out where the exe is located
	if (readlink("/proc/self/exe", bindir, sizeof(bindir)-1) > 0)
	{
		*COM_SkipPath(bindir) = 0;
		printf("Binary is located at \"%s\"\n", bindir);
		parms.binarydir = bindir;
	}
/*#elif defined(__bsd__)
	//attempt to figure out where the exe is located
	if (readlink("/proc/self/file", bindir, sizeof(bindir)-1) > 0)
	{
		*COM_SkipPath(bindir) = 0;
		printf("Binary is located at "%s"\n", bindir);
		parms.binarydir = bindir;
	}
*/
#endif

	isPlugin = !!COM_CheckParm("-plugin");
	if (isPlugin)
	{
		printf("status Starting up!\n");
		fflush(stdout);
		nostdout = true;
	}


	noconinput = COM_CheckParm("-noconinput");
	if (!noconinput)
		fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);

	if (COM_CheckParm("-nostdout"))
		nostdout = 1;

	Host_Init(&parms);

	oldtime = Sys_DoubleTime ();
	while (1)
	{
		double sleeptime;

#ifdef __MACOSX__
		//wow, not even windows was this absurd.
#ifdef GLQUAKE
		if (glcocoaRunLoop())
		{
			oldtime = Sys_DoubleTime ();
			continue;
		}
#endif
#endif

// find time spent rendering last frame
		newtime = Sys_DoubleTime ();
		time = newtime - oldtime;

		sleeptime = Host_Frame(time);
		oldtime = newtime;

		Sys_Sleep(sleeptime);
	}
}


/*
================
Sys_MakeCodeWriteable
================
*/
#if 0
void Sys_MakeCodeWriteable (void *startptr, unsigned long length)
{

	int r;
	uintptr_t addr;
	int psize = getpagesize();

	addr = ((uintptr_t)startptr & ~(psize-1)) - psize;

//	fprintf(stderr, "writable code %lx(%lx)-%lx, length=%lx\n", startaddr,
//			addr, startaddr+length, length);

	r = mprotect((char*)addr, length + startaddr - addr + psize, 7);

	if (r < 0)
    		Sys_Error("Protection change failed\n");
}
#endif

//fixme: some sort of taskbar/gnome panel flashing.
void Sys_ServerActivity(void)
{
}

//FIXME: this is hacky. Unlike other OSes where the GUI is part of the OS, X is seperate
//from the OS. This will cause problems with framebuffer-only setups.
qboolean Sys_GetDesktopParameters(int *width, int *height, int *bpp, int *refreshrate)
{
#ifdef __MACOSX__
//this about sums up the problem with this function
	return false;
#else
	return X11_GetDesktopParameters(width, height, bpp, refreshrate);

	Display *xtemp;
	int scr;

	xtemp = XOpenDisplay(NULL);

	if (!xtemp)
		return false;

	scr = DefaultScreen(xtemp);

	*width = DisplayWidth(xtemp, scr);
	*height = DisplayHeight(xtemp, scr);
	*bpp = DefaultDepth(xtemp, scr);
	*refreshrate = 0;

	XCloseDisplay(xtemp);

	return true;
#endif
}

#ifndef GLQUAKE
#define SYS_CLIPBOARD_SIZE		256
static char clipboard_buffer[SYS_CLIPBOARD_SIZE] = {0};

char *Sys_GetClipboard(void) {
	return clipboard_buffer;
}

void Sys_CloseClipboard(char *bf)
{
}

void Sys_SaveClipboard(char *text) {
	Q_strncpyz(clipboard_buffer, text, SYS_CLIPBOARD_SIZE);
}
#endif

qboolean Sys_RandomBytes(qbyte *string, int len)
{
	qboolean res;
	int fd = open("/dev/urandom", 0);
	res = (read(fd, string, len) == len);
	close(fd);

	return res;
}