/*
 * $Id: awk.c,v 1.72 2006-08-13 16:05:04 bacon Exp $
 */

#include <xp/awk/awk.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>

#ifdef XP_CHAR_IS_WCHAR
	#include <wchar.h>
#endif

#ifndef __STAND_ALONE
	#include <xp/bas/stdio.h>
	#include <xp/bas/string.h>
	#include <xp/bas/memory.h>
	#include <xp/bas/sysapi.h>
	#include <xp/bas/assert.h>	
#else
	#include <limits.h>
	#ifndef PATH_MAX
		#define XP_PATH_MAX 4096
	#else
		#define XP_PATH_MAX PATH_MAX
	#endif
#endif

#ifdef _WIN32
#include <windows.h>
#include <tchar.h>
#pragma warning (disable: 4996)
#endif

#ifdef __STAND_ALONE
	#define xp_printf xp_awk_printf
	extern int xp_awk_printf (const xp_char_t* fmt, ...); 
	#define xp_strcmp xp_awk_strcmp
	extern int xp_awk_strcmp (const xp_char_t* s1, const xp_char_t* s2);
	#define xp_strlen xp_awk_strlen
	extern int xp_awk_strlen (const xp_char_t* s);

	#include <assert.h>
	#define xp_assert assert

	#include <stdlib.h>
	#define xp_malloc malloc
	#define xp_free free
#endif

#if defined(_WIN32) && defined(__STAND_ALONE) && defined(_DEBUG)
#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>
#endif

#if defined(__linux) && defined(_DEBUG)
#include <mcheck.h>
#endif

struct src_io
{
	const xp_char_t* input_file;
	FILE* input_handle;
};

static FILE* fopen_t (const xp_char_t* path, const xp_char_t* mode)
{
#ifdef _WIN32
	return _tfopen (path, mode);
#else
	#ifdef XP_CHAR_IS_MCHAR
	const xp_mchar_t* path_mb;
	const xp_mchar_t* mode_mb;
	#else
	xp_mchar_t path_mb[XP_PATH_MAX + 1];
	xp_mchar_t mode_mb[32];
	#endif

	#ifdef XP_CHAR_IS_MCHAR
	path_mb = path;
	mode_mb = mode;
	#else
	if (xp_wcstomcs_strict (
		path, path_mb, xp_countof(path_mb)) == -1) return XP_NULL;
	if (xp_wcstomcs_strict (
		mode, mode_mb, xp_countof(mode_mb)) == -1) return XP_NULL;
	#endif

	return fopen (path_mb, mode_mb);
#endif
}

static FILE* popen_t (const xp_char_t* cmd, const xp_char_t* mode)
{
#ifdef _WIN32
	return _tpopen (cmd, mode);
#else
	#ifdef XP_CHAR_IS_MCHAR
	const xp_mchar_t* cmd_mb;
	const xp_mchar_t* mode_mb;
	#else
	xp_mchar_t cmd_mb[2048];
	xp_mchar_t mode_mb[32];
	#endif

	#ifdef XP_CHAR_IS_MCHAR
	cmd_mb = cmd;
	mode_mb = mode;
	#else
	if (xp_wcstomcs_strict (
		cmd, cmd_mb, xp_countof(cmd_mb)) == -1) return XP_NULL;
	if (xp_wcstomcs_strict (
		mode, mode_mb, xp_countof(mode_mb)) == -1) return XP_NULL;
	#endif

	return popen (cmd_mb, mode_mb);
#endif
}

#ifdef WIN32
	#define fgets_t _fgetts
	#define fputs_t _fputts
#else
	#ifdef XP_CHAR_IS_MCHAR
		#define fgets_t fgets
		#define fputs_t fputs
	#else
		#define fgets_t fgetws
		#define fputs_t fputws
	#endif
#endif

static xp_ssize_t process_source (
	int cmd, void* arg, xp_char_t* data, xp_size_t size)
{
	struct src_io* src_io = (struct src_io*)arg;
	xp_char_t c;

	switch (cmd) 
	{
		case XP_AWK_IO_OPEN:
		{
			if (src_io->input_file == XP_NULL) return 0;
			src_io->input_handle = fopen_t (src_io->input_file, XP_T("r"));
			if (src_io->input_handle == NULL) return -1;
			return 1;
		}

		case XP_AWK_IO_CLOSE:
		{
			if (src_io->input_file == XP_NULL) return 0;
			fclose ((FILE*)src_io->input_handle);
			return 0;
		}

		case XP_AWK_IO_READ:
		{
			if (size <= 0) return -1;
		#ifdef XP_CHAR_IS_MCHAR
			c = fgetc ((FILE*)src_io->input_handle);
		#else
			c = fgetwc ((FILE*)src_io->input_handle);
		#endif
			if (c == XP_CHAR_EOF) return 0;
			*data = c;
			return 1;
		}
	}

	return -1;
}

static xp_ssize_t dump_source (
	int cmd, void* arg, xp_char_t* data, xp_size_t size)
{
	struct src_io* src_io = (struct src_io*)arg;

	switch (cmd) 
	{
		case XP_AWK_IO_OPEN:
		{
			return 0;
		}

		case XP_AWK_IO_CLOSE:
		{
			return 0;
		}

		case XP_AWK_IO_WRITE:
		{
			xp_size_t i;
			for (i = 0; i < size; i++)
			{
		#ifdef XP_CHAR_IS_MCHAR
				fputc (data[i], stdout);
		#else
				fputwc (data[i], stdout);
		#endif
			}
			return size;
		}
	}

	return -1;
}


static xp_ssize_t process_extio_pipe (
	int cmd, void* arg, xp_char_t* data, xp_size_t size)
{
	xp_awk_extio_t* epa = (xp_awk_extio_t*)arg;

	switch (cmd)
	{
		case XP_AWK_IO_OPEN:
		{
			FILE* handle;
			const xp_char_t* mode;

			if (epa->mode == XP_AWK_IO_PIPE_READ)
				mode = XP_T("r");
			else if (epa->mode == XP_AWK_IO_PIPE_WRITE)
				mode = XP_T("w");
			else return -1; /* TODO: any way to set the error number? */
xp_printf (XP_TEXT("opending %s of type %d (pipe)\n"),  epa->name, epa->type);
			handle = popen_t (epa->name, mode);
			if (handle == NULL) return -1;
			epa->handle = (void*)handle;
			return 1;
		}

		case XP_AWK_IO_CLOSE:
		{
xp_printf (XP_TEXT("closing %s of type (pipe) %d\n"),  epa->name, epa->type);
			fclose ((FILE*)epa->handle);
			epa->handle = NULL;
			return 0;
		}

		case XP_AWK_IO_READ:
		{
			if (fgets_t (data, size, (FILE*)epa->handle) == XP_NULL) 
				return 0;
			return xp_strlen(data);
		}

		case XP_AWK_IO_WRITE:
		{
			/*
			if (fputs_t (data, size, (FILE*)epa->handle) == XP_NULL) 
				return 0;
			return size;
			*/
			return -1;
		}

		case XP_AWK_IO_NEXT:
		{
			return -1;
		}
	}

	return -1;
}

static xp_ssize_t process_extio_file (
	int cmd, void* arg, xp_char_t* data, xp_size_t size)
{
	xp_awk_extio_t* epa = (xp_awk_extio_t*)arg;

	switch (cmd)
	{
		case XP_AWK_IO_OPEN:
		{
			FILE* handle;
			const xp_char_t* mode;

			if (epa->mode == XP_AWK_IO_FILE_READ)
				mode = XP_T("r");
			else if (epa->mode == XP_AWK_IO_FILE_WRITE)
				mode = XP_T("w");
			else if (epa->mode == XP_AWK_IO_FILE_APPEND)
				mode = XP_T("a");
			else return -1; /* TODO: any way to set the error number? */

xp_printf (XP_TEXT("opending %s of type %d (file)\n"),  epa->name, epa->type);
			handle = fopen_t (epa->name, mode);
			if (handle == NULL) return -1;
			epa->handle = (void*)handle;
			return 1;
		}

		case XP_AWK_IO_CLOSE:
		{
xp_printf (XP_TEXT("closing %s of type %d (file)\n"),  epa->name, epa->type);
			fclose ((FILE*)epa->handle);
			epa->handle = NULL;
			return 0;
		}

		case XP_AWK_IO_READ:
		{
			if (fgets_t (data, size, (FILE*)epa->handle) == XP_NULL) 
				return 0;
			return xp_strlen(data);
		}

		case XP_AWK_IO_WRITE:
		{
			/* TODO: how to return error or 0 */
			fputs_t (data, /*size,*/ (FILE*)epa->handle);
			return -1;
		}

		case XP_AWK_IO_NEXT:
		{
			return -1;
		}

	}

	return -1;
}

static int open_extio_console (xp_awk_extio_t* epa);
static int close_extio_console (xp_awk_extio_t* epa);
static int next_extio_console (xp_awk_extio_t* epa);

static const xp_char_t* infiles[] =
{
	//XP_T(""),
	XP_T("awk.in"),
	XP_NULL
};

static xp_size_t infile_no = 0;

static xp_ssize_t process_extio_console (
	int cmd, void* arg, xp_char_t* data, xp_size_t size)
{
	xp_awk_extio_t* epa = (xp_awk_extio_t*)arg;

	if (cmd == XP_AWK_IO_OPEN)
	{
		return open_extio_console (epa);
	}
	else if (cmd == XP_AWK_IO_CLOSE)
	{
		return close_extio_console (epa);
	}
	else if (cmd == XP_AWK_IO_READ)
	{
		while (fgets_t (data, size, epa->handle) == XP_NULL)
		{
			/* it has reached the end of the current file.
			 * open the next file if available */
			if (infiles[infile_no] == XP_NULL) 
			{
				/* no more input console */

				/* is this correct??? */
				/*
				if (epa->handle != XP_NULL &&
				    epa->handle != stdin &&
				    epa->handle != stdout &&
				    epa->handle != stderr) fclose (epa->handle);
				epa->handle = XP_NULL;
				*/

				return 0;
			}

			if (infiles[infile_no][0] == XP_T('\0'))
			{
				if (epa->handle != XP_NULL &&
				    epa->handle != stdin &&
				    epa->handle != stdout &&
				    epa->handle != stderr) fclose (epa->handle);
				epa->handle = stdin;
			}
			else
			{
				FILE* fp = fopen_t (infiles[infile_no], XP_T("r"));
				if (fp == XP_NULL)
				{
xp_printf (XP_TEXT("failed to open the next console of type %x - fopen failure\n"), epa->type);
					return -1;
				}

				if (epa->handle != XP_NULL &&
				    epa->handle != stdin &&
				    epa->handle != stdout &&
				    epa->handle != stderr) fclose (epa->handle);

xp_printf (XP_TEXT("open the next console [%s]\n"), infiles[infile_no]);
				epa->handle = fp;
			}

			infile_no++;	
		}

		return xp_strlen(data);
	}
	else if (cmd == XP_AWK_IO_WRITE)
	{
		/* TODO: how to return error or 0 */
		fputs_t (data, /*size,*/ (FILE*)epa->handle);
		/*MessageBox (NULL, data, data, MB_OK);*/
		return size;
	}
	else if (cmd == XP_AWK_IO_NEXT)
	{
		return next_extio_console (epa);
	}

	return -1;
}

static int open_extio_console (xp_awk_extio_t* epa)
{
	/* TODO: OpenConsole in GUI APPLICATION */

	/* epa->name is always empty for console */
	xp_assert (epa->name[0] == XP_T('\0'));

xp_printf (XP_TEXT("opening console[%s] of type %x\n"), epa->name, epa->type);

	if (epa->mode == XP_AWK_IO_CONSOLE_READ)
	{
		if (infiles[infile_no] == XP_NULL)
		{
			/* no more input file */
xp_printf (XP_TEXT("console - no more file\n"));;
			return 0;
		}

		if (infiles[infile_no][0] == XP_T('\0'))
		{
xp_printf (XP_T("    console(r) - <standard input>\n"));
			epa->handle = stdin;
		}
		else
		{
			/* a temporary variable fp is used here not to change 
			 * any fields of epa when the open operation fails */
			FILE* fp = fopen_t (infiles[infile_no], XP_T("r"));
			if (fp == XP_NULL)
			{
xp_printf (XP_TEXT("failed to open console of type %x - fopen failure\n"), epa->type);
				return -1;
			}

xp_printf (XP_T("    console(r) - %s\n"), infiles[infile_no]);
			epa->handle = fp;
		}

		infile_no++;
		return 1;
	}
	else if (epa->mode == XP_AWK_IO_CONSOLE_WRITE)
	{
xp_printf (XP_T("    console(w) - <standard output>\n"));
		epa->handle = stdout;
		return 1;
	}

	return -1;
}

static int close_extio_console (xp_awk_extio_t* epa)
{
xp_printf (XP_TEXT("closing console of type %x\n"), epa->type);

	if (epa->handle != XP_NULL &&
	    epa->handle != stdin && 
	    epa->handle != stdout && 
	    epa->handle != stderr)
	{
		fclose (epa->handle);
	}

	/* TODO: CloseConsole in GUI APPLICATION */
	return 0;
}

static int next_extio_console (xp_awk_extio_t* epa)
{
	int n;
	FILE* fp = epa->handle;
xp_printf (XP_TEXT("switching console[%s] of type %x\n"), epa->name, epa->type);

	n = open_extio_console(epa);
	if (n == -1) return -1;

	if (n == 0) 
	{
		/* if there is no more file, keep the previous handle */
		return 0;
	}

	if (fp != XP_NULL && fp != stdin && 
	    fp != stdout && fp != stderr) fclose (fp);

	return n;
}


xp_awk_t* app_awk = NULL;
void* app_run = NULL;

static void __stop_run (int sig)
{
	signal  (SIGINT, SIG_IGN);
	xp_awk_stop (app_awk, app_run);
	//xp_awk_stoprun (awk, handle);
	/*xp_awk_stopallruns (awk); */
	signal  (SIGINT, __stop_run);
}

static void __on_run_start (xp_awk_t* awk, void* handle, void* arg)
{
	app_awk = awk;	
	app_run = handle;
xp_printf (XP_T("AWK PRORAM ABOUT TO START...\n"));
}

static void __on_run_end (xp_awk_t* awk, void* handle, int errnum, void* arg)
{
	if (errnum != XP_AWK_ENOERR)
	{
		xp_printf (XP_T("AWK PRORAM ABOUT TO END WITH AN ERROR - %d - %s\n"), errnum, xp_awk_geterrstr (errnum));
	}
	else xp_printf (XP_T("AWK PRORAM ENDED SUCCESSFUL\n"));

	app_awk = NULL;	
	app_run = NULL;
}

#if defined(__STAND_ALONE) && !defined(_WIN32)
static int __main (int argc, char* argv[])
#else
static int __main (int argc, xp_char_t* argv[])
#endif
{
	xp_awk_t* awk;
	xp_awk_srcios_t srcios;
	xp_awk_runcbs_t runcbs;
	xp_awk_runios_t runios;
	struct src_io src_io = { NULL, NULL };
	int opt;

	if ((awk = xp_awk_open(XP_NULL)) == XP_NULL) 
	{
		xp_printf (XP_T("Error: cannot open awk\n"));
		return -1;
	}

	opt = XP_AWK_EXPLICIT | XP_AWK_UNIQUE | XP_AWK_DBLSLASHES |
		XP_AWK_SHADING | XP_AWK_IMPLICIT | XP_AWK_SHIFT | 
		XP_AWK_EXTIO | XP_AWK_BLOCKLESS | XP_AWK_STRINDEXONE;

	if (argc == 2) 
	{
#if defined(__STAND_ALONE) && !defined(_WIN32)
		if (strcmp(argv[1], "-m") == 0)
#else
		if (xp_strcmp(argv[1], XP_T("-m")) == 0)
#endif
		{
			xp_awk_close (awk);
			xp_printf (XP_T("Usage: %s [-m] source_file\n"), argv[0]);
			return -1;
		}

		src_io.input_file = argv[1];
	}
	else if (argc == 3)
	{
#if defined(__STAND_ALONE) && !defined(_WIN32)
		if (strcmp(argv[1], "-m") == 0)
#else
		if (xp_strcmp(argv[1], XP_T("-m")) == 0)
#endif
		{
			opt |= XP_AWK_RUNMAIN;
		}
		else
		{
			xp_awk_close (awk);
			xp_printf (XP_T("Usage: %s [-m] source_file\n"), argv[0]);
			return -1;
		}

		src_io.input_file = argv[2];
	}
	else
	{
		xp_awk_close (awk);
		xp_printf (XP_T("Usage: %s [-m] source_file\n"), argv[0]);
		return -1;
	}

	xp_awk_setopt (awk, opt);

	srcios.in = process_source;
	srcios.out = dump_source;
	srcios.custom_data = &src_io;

	if (xp_awk_parse (awk, &srcios) == -1) 
	{
		int errnum = xp_awk_geterrnum(awk);
#if defined(__STAND_ALONE) && !defined(_WIN32) && defined(XP_CHAR_IS_WCHAR)
		xp_printf (
			XP_T("ERROR: cannot parse program - line %u [%d] %ls\n"), 
			(unsigned int)xp_awk_getsrcline(awk), 
			errnum, xp_awk_geterrstr(errnum));
#else
		xp_printf (
			XP_T("ERROR: cannot parse program - line %u [%d] %s\n"), 
			(unsigned int)xp_awk_getsrcline(awk), 
			errnum, xp_awk_geterrstr(errnum));
#endif
		xp_awk_close (awk);
		return -1;
	}

	signal (SIGINT, __stop_run);

	runios.pipe = process_extio_pipe;
	runios.coproc = XP_NULL;
	runios.file = process_extio_file;
	runios.console = process_extio_console;

	runcbs.on_start = __on_run_start;
	runcbs.on_end = __on_run_end;
	runcbs.custom_data = XP_NULL;

	if (xp_awk_run (awk, &runios, &runcbs) == -1)
	{
		int errnum = xp_awk_geterrnum(awk);
#if defined(__STAND_ALONE) && !defined(_WIN32) && defined(XP_CHAR_IS_WCHAR)
		xp_printf (
			XP_T("error: cannot run program - [%d] %ls\n"), 
			errnum, xp_awk_geterrstr(errnum));
#else
		xp_printf (
			XP_T("error: cannot run program - [%d] %s\n"), 
			errnum, xp_awk_geterrstr(errnum));
#endif

		xp_awk_close (awk);
		return -1;
	}

	xp_awk_close (awk);
	return 0;
}

#if defined(__STAND_ALONE) && !defined(_WIN32)
int main (int argc, char* argv[])
#else
int xp_main (int argc, xp_char_t* argv[])
#endif
{
	int n;
#if defined(__linux) && defined(_DEBUG)
	mtrace ();
#endif
/*#if defined(_WIN32) && defined(__STAND_ALONE) && defined(_DEBUG)
	_CrtSetDbgFlag (_CRTDBG_LEAK_CHECK_DF | _CRTDBG_ALLOC_MEM_DF | _CRTDBG_CHECK_ALWAYS_DF);
#endif*/

	n = __main (argc, argv);

#if defined(__linux) && defined(_DEBUG)
	muntrace ();
#endif
#if defined(_WIN32) && defined(__STAND_ALONE) && defined(_DEBUG)
	_CrtDumpMemoryLeaks ();
	wprintf (L"Press ENTER to quit\n");
	getchar ();
#endif

	return n;
}