/* error.c
   Copyright (C) 2005,2006,2007 Eugene K. Ressler, Jr.

This file is part of Sketch, a small, simple system for making 
3d drawings with LaTeX and the PSTricks or TikZ package.

Sketch 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 3, or (at your option)
any later version.

Sketch 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 Sketch; see the file COPYING.txt.  If not, see
http://www.gnu.org/copyleft */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "error.h"

SRC_LINE no_line = { NULL, 0 };

typedef enum error_type_t
{
  E_REMARK,
  E_WARNING,
  E_ERROR,
  E_FATAL_ERROR,
  E_N				// keep last; this is the number of error types
}
ERROR_TYPE;

char *error_type_str[] = {
  "remark",
  "warning",
  "error",
  "fatal",
};

static int n_errors[E_N];	// assumes C initialization to zero

static void
print_error (ERROR_TYPE type, SRC_LINE line, char *fmt, va_list arg_list)
{
  n_errors[type]++;
  if (line.file_name)
    fprintf (stderr, "%s", line.file_name);
  if (line.number > 0)
    fprintf (stderr, "(%u) : ", line.number);
  fprintf (stderr, "%s, ", error_type_str[type]);
  vfprintf (stderr, fmt, arg_list);
  fprintf (stderr, "\n");
}

void
remark (SRC_LINE line, char *fmt, ...)
{
  va_list arg_list;

  va_start (arg_list, fmt);
  print_error (E_REMARK, line, fmt, arg_list);
  va_end (arg_list);
}

void
warn (SRC_LINE line, char *fmt, ...)
{
  va_list arg_list;

  va_start (arg_list, fmt);
  print_error (E_WARNING, line, fmt, arg_list);
  va_end (arg_list);
}

void
err (SRC_LINE line, char *fmt, ...)
{
  va_list arg_list;

  va_start (arg_list, fmt);
  print_error (E_ERROR, line, fmt, arg_list);
  va_end (arg_list);
}

void
die (SRC_LINE line, char *fmt, ...)
{
  va_list arg_list;

  va_start (arg_list, fmt);
  print_error (E_FATAL_ERROR, line, fmt, arg_list);
  va_end (arg_list);
  report_errors ();
}

int
trouble_p (void)
{
  return n_errors[E_ERROR] > 0 || n_errors[E_FATAL_ERROR] > 0;
}

void
report_errors (void)
{
  int i, n_total = 0;

  // start printing summary
  fprintf (stderr, "summary: ");
  for (i = 0; i < E_N; i++)
    {
      if (n_errors[i] > 0)
	{
	  if (n_total > 0)
	    fprintf (stderr, ", ");
	  fprintf (stderr, "%d %s", n_errors[i], error_type_str[i]);
	  n_total++;
	}
    }

  // see if we need to abort
  if (trouble_p ())
    {
      fprintf (stderr, "\nquitting...\n");
      exit (1);
    }
  // not aborting, so finish up the summary
  if (n_total == 0)
    {
      fprintf (stderr, "no errors");
    }
  fprintf (stderr, "\n");

  // zero the error counters
  for (i = 0; i < E_N; i++)
    n_errors[i] = 0;
}
