/***************************************************************************

  gb_error.c

  Errors management routines

  (c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>

  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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.

***************************************************************************/

#define __GB_ERROR_C

#include "gb_common.h"
#include <stdarg.h>
#include <ctype.h>

#include "gb_buffer.h"
#include "gb_error.h"
#include "gbx_debug.h"
#include "gbx_exec.h"
#include "gbx_api.h"

//#define DEBUG_ERROR 1

ERROR_CONTEXT *ERROR_current = NULL;
ERROR_INFO ERROR_last = { 0 };
bool ERROR_backtrace = FALSE;

static int _lock = 0;

static const char *_message[65] =
{
  /*  0 E_UNKNOWN */ "Unknown error",
  /*  1 E_MEMORY */ "Out of memory",
  /*  2 E_CLASS */ ".Cannot load class '&1': &2&3",
  /*  3 E_STACK */ "Stack overflow",
  /*  4 E_NEPARAM */ "Not enough arguments",
  /*  5 E_TMPARAM */ "Too many arguments",
  /*  6 E_TYPE */ ".Type mismatch: wanted &1, got &2 instead",
  /*  7 E_OVERFLOW */ "Overflow",
  /*  8 E_ILLEGAL */ "Illegal instruction",
  /*  9 E_NFUNC */ "Not a function",
  /* 10 E_CSTATIC */ ".Class '&1' is not creatable",
  /* 11 E_NSYMBOL */ ".Unknown symbol '&1' in class '&2'",
  /* 12 E_NOBJECT */ "Not an object",
  /* 13 E_NULL */ "Null object",
  /* 14 E_STATIC */ ".'&1.&2' is static",
  /* 15 E_NREAD */ ".'&1.&2' is write only",
  /* 16 E_NWRITE */ ".'&1.&2' is read only",
  /* 17 E_NPROPERTY */ ".'&1.&2' is not a property",
  /* 18 E_NRETURN */ "No return value",
  /* 19 E_MATH*/ "Mathematic error",
  /* 20 E_ARG */ "Bad argument",
  /* 21 E_BOUND */ "Out of bounds",
  /* 22 E_NDIM */ "Bad number of dimensions",
  /* 23 E_NARRAY */ "Not an array",
  /* 24 E_MAIN */ "No startup method",
  /* 25 E_NNEW */ "No instanciation method",
  /* 26 E_ZERO */ "Division by zero",
  /* 27 E_LIBRARY */ ".Cannot load component '&1': &2",
  /* 28 E_EVENT */ ".Bad event handler in &1.&2(): &3",
  /* 29 E_IOBJECT */ "Invalid object",
  /* 30 E_ENUM */ "Not an enumeration",
  /* 31 E_UCONV */ "Unsupported string conversion",
  /* 32 E_CONV */ "Bad string conversion",
  /* 33 E_DATE */ "Invalid date",
  /* 34 E_BADPATH */ "Invalid path",
  /* 35 E_OPEN */ ".Cannot open file '&1': &2",
  /* 36 E_PROJECT */ ".Bad project file: line &1: &2",
  /* 37 E_FULL */ "Device is full",
  /* 38 E_EXIST */ "File already exists",  /* &1 */
  /* 39 E_EOF */ "End of file",
  /* 40 E_FORMAT */ "Bad format string",
  /* 41 E_DYNAMIC */ ".'&1.&2' is not static",
  /* 42 E_SYSTEM */ ".System error #&1: &2",
  /* 43 E_ACCESS */ "Access forbidden",
  /* 44 E_TOOLONG */ "File name is too long",
  /* 45 E_NEXIST */ "File or directory does not exist", /* &1 */
  /* 46 E_DIR */ "File is a directory", /* &1 */
  /* 47 E_READ */ "Read error",
  /* 48 E_WRITE */ "Write error",
  /* 49 E_NDIR */ ".Not a directory: &1",
  /* 50 E_REGEXP */ ".Bad regular expression: &1",
  /* 51 E_ARCH */ ".Bad archive: &1: &2",
  /* 52 E_REGISTER */ ".Cannot register class '&1'",
  /* 53 E_CLOSED */ "Stream is closed",
  /* 54 E_VIRTUAL */ "Bad use of virtual class",
  /* 55 E_STOP */ "STOP instruction encountered",
  /* 56 E_STRING */ "Too many simultaneous new strings",
  /* 57 E_EVAL */ ".Bad expression: &1",
  /* 58 E_LOCK */ "File is locked",
  /* 59 E_PARENT */ "No parent class",
  /* 60 E_EXTLIB */ ".Cannot find dynamic library '&1': &2",
  /* 61 E_EXTSYM */ ".Cannot find symbol '&2' in dynamic library '&1'",
  /* 62 E_BYREF */ "Argument cannot be passed by reference",
  /* 63 E_OVERRIDE */ ".'&1.&2' is badly overridden in class '&3'",
  NULL
};



void ERROR_lock()
{
	_lock++;
}


void ERROR_unlock()
{
	_lock--;
}

void ERROR_reset(ERROR_INFO *info)
{
	info->code = 0;
	if (info->free)
	{
		STRING_unref(&info->msg);
		info->free = FALSE;
	}
	info->msg = NULL;
	if (info->backtrace)
	{
		#if DEBUG_ERROR
		fprintf(stderr, "ERROR_reset: DEBUG_free_backtrace: <<%p>>\n", info->backtrace);
		#endif
		DEBUG_free_backtrace(&info->backtrace);
		info->backtrace = NULL;
	}
}

void ERROR_clear()
{
	if (_lock)
	{
		#if DEBUG_ERROR
		fprintf(stderr, "ERROR_clear: (%p) *LOCKED*\n", ERROR_current);
		#endif
		return;
	}
	
	#if DEBUG_ERROR
	fprintf(stderr, "ERROR_clear: (%p)\n", ERROR_current);
	#endif
	ERROR_reset(&ERROR_current->info);
}


void ERROR_enter(ERROR_CONTEXT *err)
{
  err->prev = ERROR_current;
  err->info.code = 0;
  err->info.free = FALSE;
  err->info.msg = NULL;
  err->info.backtrace = NULL;
  
  ERROR_current = err;

	#if DEBUG_ERROR
	fprintf(stderr, "ERROR_enter: (%p)\n", ERROR_current);
	fprintf(stderr, ">> ERROR_enter");
	{
		ERROR_CONTEXT *e = err;
		while (e)
		{
			fprintf(stderr, " -> %p", e);
			e = e->prev;
		}
		fprintf(stderr, "\n");
	}
  #endif
}


void ERROR_leave(ERROR_CONTEXT *err)
{
  if (err->prev == ERROR_LEAVE_DONE)
  	return;
  	
	#if DEBUG_ERROR
	fprintf(stderr, "<< ERROR_leave");
	{
		ERROR_CONTEXT *e = err;
		while (e)
		{
			fprintf(stderr, " -> %p", e);
			e = e->prev;
		}
		fprintf(stderr, " : %d %s\n", err->info.code, err->info.msg);
	}
	#endif
	
	//if (!err->prev)
	//	BREAKPOINT();
  
	ERROR_current = err->prev;
	
	if (ERROR_current)
	{
		#if DEBUG_ERROR
		fprintf(stderr, "ERROR_leave: (%p)\n", ERROR_current);
		#endif
		ERROR_reset(&ERROR_current->info);
		ERROR_current->info = err->info;
	}
	else
		ERROR_reset(&err->info);

	err->prev = ERROR_LEAVE_DONE;
  //ERROR_reset(err);
}

void ERROR_propagate()
{
	#if DEBUG_ERROR
	fprintf(stderr, "ERROR_propagate: %d %s\n", ERROR_current->info.code, ERROR_current->info.msg);
	#endif
	
	if (ERROR_current->ret)
		ERROR_leave(ERROR_current);
  longjmp(ERROR_current->env, 1);
}



const char *ERROR_get(void)
{
  /*
  if (code > 0 && code < 256)
    return strerror(code);
  else
    return ERROR_Message[code - 256];
  */
  return strerror(errno);
}

static int get_message_length(const char *pattern, char *arg[])
{
	uchar c;
	int len = 0;
	
	for(;;)
	{
		c = *pattern++;
		if (!c)
			break;
		if (c == '&')
		{
			c = *pattern++;
			if (c >= '1' && c <= '4')
				len += strlen(arg[c - '1']);
		}
		else
			len++;
	}
	
	return len;
}

void ERROR_define(const char *pattern, char *arg[])
{
  uchar c;
  bool subst;
  char *msg = NULL;
  int len;

	ERROR_clear();

  if ((intptr_t)pattern >= 0 && (intptr_t)pattern < 256)
  {
    ERROR_current->info.code = (int)(intptr_t)pattern;
    pattern = _message[(int)(intptr_t)pattern];
  }
  else if ((intptr_t)pattern == E_ABORT)
  {
    ERROR_current->info.code = E_ABORT;
  	pattern = "";
	}
	else
    ERROR_current->info.code = E_CUSTOM;

  if (*pattern == '.' || ERROR_current->info.code == E_CUSTOM) //(arg) //(index(pattern, '&'))
  {
  	if (*pattern == '.')
    	pattern++;
    subst = FALSE;

		len = get_message_length(pattern, arg);
    if (len)
    {
			STRING_new(&msg, NULL, len);
			ERROR_current->info.msg = msg;
    	ERROR_current->info.free = TRUE;
    
			for (;;)
			{
				c = *pattern++;
				if (c == 0)
					break;
					
				if (c == '&')
				{
					c = *pattern++;
					if (c >= '1' && c <= '4')
					{
						c -= '1';
						len = strlen(arg[c]);
						memcpy(msg, arg[c], len);
						msg += len;
					}
				}
				else
					*msg++ = c;
			}
			
			*msg = 0;
		}
  }
  else
  {
    ERROR_current->info.msg = (char *)pattern;
    ERROR_current->info.free = FALSE;
  }

	//fprintf(stderr, "ERROR_define: %p %d %p '%s'\n", ERROR_current, ERROR_current->info.code, ERROR_current->info.msg, ERROR_current->info.msg);

	//STRING_add_char(&ERROR_current->info.msg, 0);

  ERROR_current->info.cp = CP;
  ERROR_current->info.fp = FP;
  ERROR_current->info.pc = PC;
  
  if (EXEC_debug || (ERROR_backtrace && (CP && CP->debug)))
  {
  	//DEBUG_free_backtrace(&ERROR_current->info.backtrace);
  	ERROR_current->info.backtrace = DEBUG_backtrace();
		#if DEBUG_ERROR
		fprintf(stderr, "ERROR_define: (%p) DEBUG_backtrace: <<%p>>\n", ERROR_current, ERROR_current->info.backtrace);
		#endif
  }
  
  #if DEBUG_ERROR
	fprintf(stderr, "ERROR_define: %s\n", ERROR_current->info.msg);
  #endif
}

void THROW(int code, ...)
{
  va_list args;
  int i;
  char *arg[4];

  va_start(args, code);

  for (i = 0; i < 4; i++)
    arg[i] = va_arg(args, char *);

  ERROR_define((char *)(intptr_t)code, arg);
  PROPAGATE();
}


void THROW_SYSTEM(int err, const char *path)
{
	char buf[6];
	
  switch(err)
  {
    case ENOENT:
      THROW(E_NEXIST, path);

    case EISDIR:
      THROW(E_DIR, path);

    case ENOTDIR:
      THROW(E_NDIR, path);

    case ENOMEM:
      THROW(E_MEMORY);

    case EACCES:
      THROW(E_ACCESS);

    case ENAMETOOLONG:
      THROW(E_TOOLONG);

    case ENOSPC:
      THROW(E_FULL);

    case EEXIST:
      THROW(E_EXIST, path);

    default:
    	sprintf(buf, "%d", err);
      THROW(E_SYSTEM, buf, strerror(err));
  }
}

void ERROR_panic(const char *error, ...)
{
  va_list args;

  va_start(args, error);

  fflush(NULL);

  fprintf(stderr, "\n** INTERNAL ERROR **\n** ");
  vfprintf(stderr, error, args);
  putc('\n', stderr);
  if (ERROR_current->info.code)
  {
    ERROR_print();
  }
  fprintf(stderr, "** Program aborting. Sorry! :-(\n");
  /*abort();*/
  _exit(1);
}


void ERROR_print_at(FILE *where, bool msgonly, bool newline)
{
  if (!ERROR_current->info.code)
    return;

	if (!msgonly)
	{
		if (ERROR_current->info.cp && ERROR_current->info.fp && ERROR_current->info.pc)
			fprintf(where, "%s: ", DEBUG_get_position(ERROR_current->info.cp, ERROR_current->info.fp, ERROR_current->info.pc));
		else
			fprintf(where, "ERROR: ");
		/*if (ERROR_current->info.code > 0 && ERROR_current->info.code < 256)
			fprintf(where, "%ld:", ERROR_current->info.code);*/
		if (ERROR_current->info.code > 0)
			fprintf(where, "#%d: ", ERROR_current->info.code);
	}

  fprintf(where, "%s", ERROR_current->info.msg);
  if (newline)
  	fputc('\n', where);
}

void ERROR_print(void)
{
  static bool lock = FALSE;
  
  DEBUG_BACKTRACE *bt = ERROR_current->info.backtrace;

  ERROR_print_at(stderr, FALSE, TRUE);
  
  if (bt)
  {
  	int i;
  	
		for(i = 0; i < ARRAY_count(bt); i++)
			fprintf(stderr, "%d: %s\n", i, DEBUG_get_position(bt[i].cp, bt[i].fp, bt[i].pc));
	}

  if (EXEC_main_hook_done && !EXEC_debug && EXEC_Hook.error && !lock)
  {
    lock = TRUE;
    GAMBAS_DoNotRaiseEvent = TRUE;
    HOOK(error)(ERROR_current->info.code, ERROR_current->info.msg, DEBUG_get_position(ERROR_current->info.cp, ERROR_current->info.fp, ERROR_current->info.pc));
    lock = FALSE;
  }
}

void ERROR_save(ERROR_INFO *save)
{
	ERROR_reset(save);
	*save = ERROR_current->info;
	CLEAR(&ERROR_current->info);
	//ERROR_reset(&ERROR_current->info);
}

void ERROR_restore(ERROR_INFO *save)
{
	ERROR_reset(&ERROR_current->info);
	ERROR_current->info = *save;
	CLEAR(save);
	//ERROR_reset(save);
}

void ERROR_set_last(void)
{
	ERROR_reset(&ERROR_last);
	ERROR_last = ERROR_current->info;
	if (ERROR_last.free)
		STRING_ref(ERROR_last.msg);
	ERROR_last.backtrace = DEBUG_copy_backtrace(ERROR_last.backtrace);
	#if DEBUG_ERROR
	fprintf(stderr, "ERROR_set_last: DEBUG_copy_backtrace: <<%p>>\n", ERROR_last.backtrace);
	#endif
}