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

  compile.c

  Compiler initialization, reserved keywords table and subroutines table.

  (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 __GBC_COMPILE_C

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>

#include <sys/types.h>
#include <dirent.h>
#include <pwd.h>
#include <unistd.h>

#include "gb_common.h"
#include "gb_error.h"
#include "gb_str.h"
#include "gb_file.h"
#include "gb_component.h"

#include "gbc_compile.h"
#include "gb_reserved.h"
#include "gbc_read.h"
#include "gbc_trans.h"
#include "gbc_header.h"
#include "gb_code.h"
#include "gbc_output.h"
#include "gbc_form.h"

/*#define DEBUG*/

char *COMP_root = NULL;

char *COMP_project;
char *COMP_info_path;
char *COMP_info_user_path;
char *COMP_classes = NULL;

COMPILE COMP_current;

static bool read_line(FILE *f, char *dir, int max)
{
  char *p;
  int c;

  p = dir;

  for(;;)
  {
    max--;

    c = fgetc(f);
    if (c == EOF)
      return TRUE;

    if (c == '\n' || max == 0)
    {
      *p = 0;
      return FALSE;
    }

    *p++ = (char)c;
  }
}


static void add_list_file(char *library)
{
  char *path;
  FILE *fi;
  char line[256];
  int len;

  path = (char *)FILE_cat(COMP_info_path, library, NULL);
  strcat(path, ".list");

  /*printf("Reading component list file %s\n", path);*/

  fi = fopen(path, "r");

	if (!fi)
	{
		// Try the user component directory
	  path = (char *)FILE_cat(COMP_info_user_path, library, NULL);
	  strcat(path, ".list");
	  fi = fopen(path, "r");
	}

  /* We don't fail when a list file is not found, so that
     a component that references itself can compile! :-)
     In other situations, compilation will fail anyway, as
     some classes won't be declared.
	*/
  if (!fi)
  	return;

  for(;;)
  {
    if (read_line(fi, line, sizeof(line)))
      break;

		len = strlen(line);
		if (len > 2 && line[len - 1] == '?')
			len--;

    BUFFER_add(&COMP_classes, line, len);
    BUFFER_add(&COMP_classes, "\n", 1);
  }

  fclose(fi);
}


void COMPILE_init(void)
{
  const char *root;
  FILE *fp;
  char line[256];
  DIR *dir;
  struct dirent *dirent;
  const char *name;
  struct passwd *info;

  RESERVED_init();

	if (COMP_root)
		root = COMP_root;
	else
  	root = FILE_get_dir(FILE_get_dir(FILE_find_gambas()));

	// Component directory

  COMP_info_path = STR_copy(FILE_cat(root, "share/gambas" GAMBAS_VERSION_STRING "/info", NULL));
  
  // User component directory
  
  info = getpwuid(getuid());
  if (info)
  	COMP_info_user_path = STR_copy(FILE_cat(info->pw_dir, ".local/share/gambas" GAMBAS_VERSION_STRING "/info", NULL));
	else
		COMP_info_user_path = NULL;
		
  // Project classes

  BUFFER_create(&COMP_classes);

  add_list_file("gb");

  fp = fopen(COMP_project, "r");
  if (!fp)
    THROW(E_OPEN, COMP_project);

  for(;;)
  {
    if (read_line(fp, line, sizeof(line)))
      break;

    /*printf("%s\n", line);*/

    if (strncmp(line, "Library=", 8) == 0)
	    add_list_file(&line[8]);
    else if (strncmp(line, "Component=", 10) == 0)
	    add_list_file(&line[10]);
  }

  fclose(fp);

  dir = opendir(FILE_get_dir(COMP_project));
  if (dir)
  {
    while ((dirent = readdir(dir)) != NULL)
    {
      name = dirent->d_name;
      if (*name == '.')
        continue;

      if ((strcasecmp(FILE_get_ext(name), "module") == 0)
          || (strcasecmp(FILE_get_ext(name), "class") == 0))
      {
        name = FILE_get_basename(name);
        BUFFER_add(&COMP_classes, name, strlen(name));
        BUFFER_add(&COMP_classes, "\n", 1);
      }
    }

    closedir(dir);
  }

  BUFFER_add(&COMP_classes, "\n", 1);
}


void COMPILE_begin(const char *file, bool trans)
{
  struct stat info;
  off_t size;

  CLEAR(JOB);

  JOB->name = STR_copy(file);
  JOB->form = FORM_get_file(JOB->name);
  JOB->output = OUTPUT_get_file(JOB->name);

  if (trans)
  {
    JOB->trans = TRUE;
    JOB->tname = OUTPUT_get_trans_file(JOB->name);
  }

  BUFFER_create(&JOB->source);
  CLASS_create(&JOB->class);

  JOB->default_library = NO_SYMBOL;

  size = 0;

  if (stat(JOB->name, &info))
    fprintf(stderr, "gbc: Warning: Cannot stat file: %s\n", JOB->name);
  else
    size += info.st_size;
  
  if (JOB->form)
  {
    if (stat(JOB->form, &info))
      fprintf(stderr, "gbc: Warning: Cannot stat file: %s\n", JOB->form);
    else
      size += info.st_size * 2;
  }

  ALLOC(&JOB->pattern, sizeof(PATTERN) * (16 + size), "COMPILE_begin");
  JOB->pattern_count = 0;
}

void COMPILE_load(void)
{
  BUFFER_load_file(&JOB->source, JOB->name);
  /*if (JOB->source[BUFFER_length(JOB->source) - 1] != '\n')
    BUFFER_add(&JOB->source, "\n", 1);*/
  BUFFER_add(&JOB->source, "\n", 1);
}


void COMPILE_end(void)
{
  CLASS_delete(&JOB->class);
  BUFFER_delete(&JOB->source);
  FREE(&JOB->pattern, "COMPILE_end");

  STR_free(JOB->name);
  STR_free(JOB->form);
  STR_free(JOB->output);
  if (JOB->trans)
    STR_free(JOB->tname);
}

void COMPILE_exit(void)
{
  RESERVED_exit();
  BUFFER_delete(&COMP_classes);
  STR_free(COMP_project);
  STR_free(COMP_info_path);
  STR_free(COMP_root);
}