/*
 * 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.
 */

#include "common/setup_before.h"
#ifdef WITH_SQL
#include <stdio.h>

#ifdef STDC_HEADERS
# include <stdlib.h>
#else
# ifdef HAVE_MALLOC_H
#  include <malloc.h>
# endif
#endif

#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
#  include <strings.h>
# endif
#endif

#define  SQL_DBCREATOR_INTERNAL_ACCESS
#include "sql_dbcreator.h"
#undef   SQL_DBCREATOR_INTERNAL_ACCESS
#include "storage_sql.h"

#include "common/eventlog.h"
#include "common/util.h"

#include "compat/strdup.h"
#include "common/list.h"
#include "common/xalloc.h"
#include "common/xstr.h"
#include "prefs.h"
#include "common/setup_after.h"

t_elem  * curr_table  = NULL;
t_elem  * curr_column = NULL;
t_elem  * curr_cmd    = NULL;

t_db_layout * db_layout;

static void sql_escape_command(char *escape, const char *from, int len);

t_column * create_column(char * name, char * value, char * mode, char * extra_cmd)
{
  t_column * column;
  
  if (!(name))
    {
      eventlog(eventlog_level_error,__FUNCTION__,"got NULL column name");
      return NULL;
    }
  
  if (!(value))
    {
      eventlog(eventlog_level_error,__FUNCTION__,"got NULL column value");
      return NULL;
    }
  
  column = xmalloc(sizeof(t_column));
  column->name  = xstrdup(name);
  column->value = xstrdup(value);

  if (mode && extra_cmd)
  {
	  column->mode      = xstrdup(mode);
	  column->extra_cmd = xstrdup(extra_cmd);
  }
  else
  {
	  column->mode      = NULL;
	  column->extra_cmd = NULL;
  }

  return column;
};

void dispose_column(t_column * column)
{
  if (column)
    {
      if (column->name)      xfree((void *)column->name);
      if (column->value)     xfree((void *)column->value);
      if (column->mode)      xfree((void *)column->mode);
      if (column->extra_cmd) xfree((void *)column->extra_cmd);
      xfree((void *)column);
    }
}

t_sqlcommand * create_sqlcommand(char * sql_command, char * mode, char * extra_cmd)
{
  t_sqlcommand * sqlcommand;
  
  if (!(sql_command))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL sql_command");
    return NULL;
  }
  
  sqlcommand = xmalloc(sizeof(t_sqlcommand));
  sqlcommand->sql_command = xstrdup(sql_command);
  if (mode && extra_cmd)
  {
    sqlcommand->mode      = xstrdup(mode);
    sqlcommand->extra_cmd = xstrdup(extra_cmd);
  }
  else
  {
    sqlcommand->mode      = NULL;
    sqlcommand->extra_cmd = NULL;
  }

  return sqlcommand;
}

void dispose_sqlcommand(t_sqlcommand * sqlcommand)
{
  if (sqlcommand)
  {
    if (sqlcommand->sql_command) xfree((void *)sqlcommand->sql_command);
    if (sqlcommand->mode) xfree((void *)sqlcommand->mode);
    if (sqlcommand->extra_cmd) xfree((void *)sqlcommand->extra_cmd);
    xfree(sqlcommand);
  }
}

t_table * create_table(char * name)
{
  t_table * table;
  
  if (!(name))
    {
      eventlog(eventlog_level_error,__FUNCTION__,"got NULL table name");
      return NULL;
    }
  
  table = xmalloc(sizeof(t_table));
  table->name = xstrdup(name);

  table->columns = list_create();
  table->sql_commands = list_create();
  
  return table;
}

void dispose_table(t_table * table)
{
  t_elem * curr;
  t_column * column;
  t_sqlcommand * sql_command;
  
  if (table)
    {
      if (table->name) xfree((void *)table->name);
      // free list
      if (table->columns)
        {
          LIST_TRAVERSE(table->columns,curr)
	    {
	      if (!(column = elem_get_data(curr)))
		{
		  eventlog(eventlog_level_error,__FUNCTION__,"found NULL entry in list");
		  continue;
		}
	      dispose_column(column);
	      list_remove_elem(table->columns,&curr);
	    }
	  
	  list_destroy(table->columns);
        }

      if (table->sql_commands)
        {
          LIST_TRAVERSE(table->sql_commands,curr)
	    {
	      if (!(sql_command = elem_get_data(curr)))
		{
		  eventlog(eventlog_level_error,__FUNCTION__,"found NULL entry in list");
		  continue;
		}
	      dispose_sqlcommand(sql_command);
	      list_remove_elem(table->sql_commands,&curr);
	    }
	  
	  list_destroy(table->sql_commands);
        }
      
      
      xfree((void *)table);
    }
}

void table_add_column(t_table * table, t_column * column)
{
  if ((table) && (column))
    {
      list_append_data(table->columns,column);
    }
}

void table_add_sql_command(t_table * table, t_sqlcommand * sql_command)
{
  if ((table) && (sql_command))
    {
      list_append_data(table->sql_commands,sql_command);
    }
}

t_db_layout * create_db_layout()
{
  t_db_layout * db_layout;
  
  db_layout = xmalloc(sizeof(t_db_layout));

  db_layout->tables = list_create();
  
  return db_layout;
}

void dispose_db_layout(t_db_layout * db_layout)
{
  t_elem  * curr;
  t_table * table;
 

  if (db_layout)
    {
      if (db_layout->tables)
        {
          LIST_TRAVERSE(db_layout->tables,curr)
	    {
	      if (!(table = elem_get_data(curr)))
		{
		  eventlog(eventlog_level_error,__FUNCTION__,"found NULL entry in list");
		  continue;
		}
	      dispose_table(table);
	      list_remove_elem(db_layout->tables,&curr);
	    }
          list_destroy(db_layout->tables);
        }
      xfree((void *)db_layout);
    }
  
}

void db_layout_add_table(t_db_layout * db_layout, t_table * table)
{
  if ((db_layout) && (table))
    {
      list_append_data(db_layout->tables,table);
    }
}

t_table * db_layout_get_first_table(t_db_layout * db_layout)
{
  t_table * table;

  curr_column = NULL;

  if (!(db_layout))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL db_layout");
    return NULL;
  }

  if (!(db_layout->tables))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"found NULL db_layout->tables");
    return NULL;
  }

  if (!(curr_table = list_get_first(db_layout->tables)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"db_layout has no tables");
    return NULL;
  }

  if (!(table = elem_get_data(curr_table)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL elem in list");
    return NULL;
  }

  return table;
}

t_table * db_layout_get_next_table(t_db_layout * db_layout)
{
  t_table * table;

  curr_column = NULL;

  if (!(curr_table))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL curr_table");
    return NULL;
  }

  if (!(curr_table = elem_get_next(db_layout->tables, curr_table))) return NULL;

  if (!(table = elem_get_data(curr_table)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL elem in list");
    return NULL;
  }

  return table;
}

t_column * table_get_first_column(t_table * table)
{
  t_column * column;

  if (!(table))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL table");
    return NULL;
  }

  if (!(table->columns))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL table->columns");
    return NULL;
  }

  if (!(curr_column = list_get_first(table->columns)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"table has no columns");
    return NULL;
  }

  if (!(column = elem_get_data(curr_column)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL elem in list");
    return NULL;
  }

  return column;
}

t_column * table_get_next_column(t_table * table)
{
  t_column * column;

  if (!(curr_column))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL curr_column");
    return NULL;
  }

  if (!(curr_column = elem_get_next(table->columns, curr_column))) return NULL;

  if (!(column = elem_get_data(curr_column)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL elem in list");
    return NULL;
  }

  return column;
}

t_sqlcommand * table_get_first_sql_command(t_table * table)
{
  t_sqlcommand * sql_command;

  if (!(table))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL table");
    return NULL;
  }

  if (!(table->sql_commands))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL table->sql_commands");
    return NULL;
  }

  if (!(curr_cmd = list_get_first(table->sql_commands)))
  {
    return NULL;
  }

  if (!(sql_command = elem_get_data(curr_cmd)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL elem in list");
    return NULL;
  }

  return sql_command;
}

t_sqlcommand * table_get_next_sql_command(t_table * table)
{
  t_sqlcommand * sql_command;

  if (!(curr_cmd))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL curr_cmd");
    return NULL;
  }

  if (!(curr_cmd = elem_get_next(table->sql_commands, curr_cmd))) return NULL;

  if (!(sql_command = elem_get_data(curr_cmd)))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL elem in list");
    return NULL;
  }

  return sql_command;
}

int load_db_layout(char const * filename)
{
  FILE * fp;
  int    lineno;
  char * line                = NULL;
  char * tmp                 = NULL;
  char * table               = NULL;
  char * column              = NULL;
  char * value               = NULL;
  char * sqlcmd              = NULL;
  char * sqlcmd_escaped      = NULL;
  char * mode                = NULL;
  char * extra_cmd           = NULL;
  char * extra_cmd_escaped   = NULL;
  t_table * _table           = NULL;
  t_column * _column         = NULL;
  t_sqlcommand * _sqlcommand = NULL;
  t_xstr * xstr              = NULL;
  int prefix;

  if (!(filename))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"got NULL filename");
    return -1;
  }

  if (!(fp = fopen(filename,"r")))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"can't open sql_DB_layout file");
    return -1;
  }

  if (!(db_layout = create_db_layout()))
  {
    eventlog(eventlog_level_error,__FUNCTION__,"failed to create db_layout");
    fclose(fp);
    return -1;
  }

  for (lineno=1; (line = file_get_line(fp)) ; lineno++)
  {
    /* convert ${prefix} replacement variable */
    prefix = 0;
    for(tmp = line;(tmp = strstr(line, "${prefix}")); line = tmp + 9 /* strlen("${prefix}") */)
    {
	*tmp = '\0';

	if (!prefix) {
	    prefix = 1;

    	    if (!xstr) xstr = xstr_alloc();

	    xstr_clear(xstr);
	}

	xstr_cat_str(xstr, line);
	xstr_cat_str(xstr, tab_prefix);
    }
    if (prefix) {
	/* append any reminder of the original string */
	xstr_cat_str(xstr, line);
	line = (char*)xstr_get_str(xstr);
    }

    switch (line[0])
    {
      case '[':
        table = &line[1];
        if (!(tmp = strchr(table,']')))
        {
          eventlog(eventlog_level_error,__FUNCTION__,"missing ']' in line %i",lineno);
          continue;
        }
        tmp[0]='\0';
        if (_table)  db_layout_add_table(db_layout,_table);

        _table = create_table(table);

        break;
      case '"':
        if (!(_table))
        {
          eventlog(eventlog_level_error,__FUNCTION__,"found a column without previous table in line %i",lineno);
          continue;
        }
        column = &line[1];
        if (!(tmp = strchr(column,'"')))
        {
          eventlog(eventlog_level_error,__FUNCTION__,"missing '\"' at the end of column definition in line %i",lineno);
          continue;
        }
        tmp[0]='\0';
        tmp++;
        if (!(tmp = strchr(tmp,'"')))
        {
          eventlog(eventlog_level_error,__FUNCTION__,"missing default value in line %i",lineno);
          continue;
        }
        value = ++tmp;
        if (!(tmp = strchr(value,'"')))
        {
          eventlog(eventlog_level_error,__FUNCTION__,"missing '\"' at the end of default value in line %i",lineno);
          continue;
        }
        tmp[0]='\0';
	tmp++;
	mode = NULL;
	extra_cmd = NULL;
	extra_cmd_escaped = NULL;
	if ((mode = strchr(tmp,'&')) || (mode = strchr(tmp,'|')))
	{
	  if (mode[0] == mode[1])
	  {
		mode[2]='\0';
		tmp=mode+3;
		if (!(tmp = strchr(tmp,'"')))
		{
			eventlog(eventlog_level_error,__FUNCTION__,"missing starting '\"' in extra sql_command on line %i",lineno);
			continue;
		}
		extra_cmd = ++tmp;
		if (!(tmp = strchr(extra_cmd,'"')))
		{
			eventlog(eventlog_level_error,__FUNCTION__,"missing ending '\"' in extra sql_command on line %i",lineno);
			continue;
		}
		tmp[0]='\0';
	  }
	  else
	  {
            eventlog(eventlog_level_error,__FUNCTION__,"missing or non-matching secondary character in combination logic on line %i",lineno);
	    continue;
	  }
	}
	if (extra_cmd)
	{
		extra_cmd_escaped = xmalloc(strlen(extra_cmd) * 2);
		sql_escape_command(extra_cmd_escaped, extra_cmd, strlen(extra_cmd));
	}
	_column = create_column(column,value,mode,extra_cmd_escaped);
	if (extra_cmd_escaped) xfree(extra_cmd_escaped);
        table_add_column(_table,_column);
        _column = NULL;
        break;
      case ':':
        if (!(_table))
        {
          eventlog(eventlog_level_error,__FUNCTION__,"found a sql_command without previous table in line %i",lineno);
          continue;
        }
	if (line[1]!='"')
	{
	  eventlog(eventlog_level_error,__FUNCTION__,"missing starting '\"' in sql_command definition on line %i",lineno);
	  continue;
	}
	sqlcmd = &line[2];
        if (!(tmp = strchr(sqlcmd,'"')))
        {
          eventlog(eventlog_level_error,__FUNCTION__,"missing ending '\"' in sql_command definition on line %i",lineno);
          continue;
        }
        tmp[0]='\0';
	tmp++;
	mode = NULL;
	extra_cmd = NULL;
	extra_cmd_escaped = NULL;
	if ((mode = strchr(tmp,'&')) || (mode = strchr(tmp,'|')))
	{
	  if (mode[0] == mode[1])
	  {
		mode[2]='\0';
		tmp=mode+3;
		if (!(tmp = strchr(tmp,'"')))
		{
			eventlog(eventlog_level_error,__FUNCTION__,"missing starting '\"' in extra sql_command on line %i",lineno);
			continue;
		}
		extra_cmd = ++tmp;
		if (!(tmp = strchr(extra_cmd,'"')))
		{
			eventlog(eventlog_level_error,__FUNCTION__,"missing ending '\"' in extra sql_command on line %i",lineno);
			continue;
		}
		tmp[0]='\0';
	  }
	  else
	  {
            eventlog(eventlog_level_error,__FUNCTION__,"missing or non-matching secondary character in combination logic on line %i",lineno);
	    continue;
	  }
	}
	sqlcmd_escaped = xmalloc(strlen(sqlcmd) * 2);
	sql_escape_command(sqlcmd_escaped, sqlcmd, strlen(sqlcmd));
	if (extra_cmd)
	{
		extra_cmd_escaped = xmalloc(strlen(extra_cmd) * 2);
		sql_escape_command(extra_cmd_escaped, extra_cmd, strlen(extra_cmd));
	}
	_sqlcommand = create_sqlcommand(sqlcmd_escaped,mode,extra_cmd_escaped);
	xfree(sqlcmd_escaped);
	if (extra_cmd_escaped) xfree(extra_cmd_escaped);
	table_add_sql_command(_table,_sqlcommand);
	_sqlcommand = NULL;

	break;
      case '#':
        break;
      default:
        eventlog(eventlog_level_error,__FUNCTION__,"illegal starting symbol at line %i",lineno);
    }
  }
  if (_table) db_layout_add_table(db_layout,_table);

  if (xstr) xstr_free(xstr);
  file_get_line(NULL); // clear file_get_line buffer
  fclose(fp);
  return 0;
}

int sql_dbcreator(t_sql_engine * sql)
{
  t_table      * table;
  t_column     * column;
  char            _column[1024];
  char           query[1024];
  t_sqlcommand * sqlcmd;

  load_db_layout(prefs_get_DBlayoutfile());

  eventlog(eventlog_level_info, __FUNCTION__,"Creating missing tables and columns (if any)");
 
  for (table = db_layout_get_first_table(db_layout);table;table = db_layout_get_next_table(db_layout))
  {
     column = table_get_first_column(table);
     sprintf(query,"CREATE TABLE %s (%s default %s)",table->name,column->name,column->value); 
     //create table if missing
     if (!(sql->query(query)))
     {
       eventlog(eventlog_level_info,__FUNCTION__,"added missing table %s to DB",table->name);
       eventlog(eventlog_level_info,__FUNCTION__,"added missing column %s to table %s",column->name,table->name);
     }

    for (;column;column = table_get_next_column(table))
    {
      sprintf(query,"ALTER TABLE %s ADD %s DEFAULT %s",table->name,column->name,column->value);
      if (!(sql->query(query)))
      {
        eventlog(eventlog_level_info,__FUNCTION__,"added missing column %s to table %s",column->name,table->name);
	if ((column->mode != NULL) && (strcmp(column->mode,"&&") == 0))
	{
          if (!(sql->query(column->extra_cmd)))
	  {
	    eventlog(eventlog_level_info,__FUNCTION__,"sucessfully issued: %s %s",column->mode, column->extra_cmd);
	  }
	}
/*
	sscanf(column->name,"%s",_column);
	sprintf(query,"ALTER TABLE %s ALTER %s SET DEFAULT %s",table->name,_column,column->value);
	
	// If failed, try alternate language.  (From ZSoft for sql_odbc.)
	if(sql->query(query)) {
	    sprintf(query,"ALTER TABLE %s ADD DEFAULT %s FOR %s",table->name,column->value,_column);
	    sql->query(query);
	}
	// ALTER TABLE BNET add default 'false' for auth_admin;
*/
      }
      else
      {
	if ((column->mode != NULL) && (strcmp(column->mode,"||") == 0))
	{
          if (!(sql->query(column->extra_cmd)))
	  {
	    eventlog(eventlog_level_info,__FUNCTION__,"sucessfully issued: %s %s",column->mode, column->extra_cmd);
	  }
	}

      }
    }

    for (sqlcmd = table_get_first_sql_command(table);sqlcmd;sqlcmd = table_get_next_sql_command(table))
    {
        if (!(sql->query(sqlcmd->sql_command)))
        {
           eventlog(eventlog_level_info,__FUNCTION__,"sucessfully issued: %s",sqlcmd->sql_command);
	   if ((sqlcmd->mode != NULL) && (strcmp(sqlcmd->mode,"&&") == 0))
	   {
	      if (!(sql->query(sqlcmd->extra_cmd)))
	      {
		eventlog(eventlog_level_info,__FUNCTION__,"sucessfully issued: %s %s",sqlcmd->mode, sqlcmd->extra_cmd);
	      }
	   }
        }
	else
	{
	   if ((sqlcmd->mode != NULL) && (strcmp(sqlcmd->mode,"||") == 0))
	   {
	      if (!(sql->query(sqlcmd->extra_cmd)))
	      {
		eventlog(eventlog_level_info,__FUNCTION__,"sucessfully issued: %s %s",sqlcmd->mode, sqlcmd->extra_cmd);
	      }
	   }

	}
    }

    column = table_get_first_column(table);
    sscanf(column->name,"%s",_column); //get column name without format infos
    sprintf(query,"INSERT INTO %s (%s) VALUES (%s)",table->name,_column,column->value);
    if (!(sql->query(query)))
    {
      eventlog(eventlog_level_info,__FUNCTION__,"added missing default account to table %s",table->name);
    }

  }
  
  dispose_db_layout(db_layout);
 
  eventlog(eventlog_level_info,__FUNCTION__,"finished adding missing tables and columns");  
  return 0;
}

static void sql_escape_command(char *escape, const char *from, int len)
{
	if (from != NULL && len != 0) /* make sure we have a command */
	{
		char * tmp1 = xstrdup(from);			/* copy of 'from' */
		char * tmp2 = escape;
		char * tmp3 = NULL;				/* begining of string to be escaped */
		char * tmp4 = xmalloc(strlen(tmp1) * 2);	/* escaped string */
		unsigned int i,j;
	
/*		eventlog(eventlog_level_trace,__FUNCTION__,"COMMAND: %s",tmp1); */
		
		for (i=0; tmp1[i] && i < len; i++, tmp2++)
		{
			*tmp2 = tmp1[i]; /* copy 'from' to 'escape' */
			
			if (tmp1[i] == '\'') /* check if we find a string by checking for a single quote (') */
			{
				tmp3 = &tmp1[++i]; /* set tmp3 to the begining of the string to be escaped */
				
				for(; tmp1[i] && tmp1[i] != '\'' && i < len; i++); /* find the end of the string to be escaped */
				
				tmp1[i] = '\0'; /* set end of string with null terminator */
/*				eventlog(eventlog_level_trace,__FUNCTION__,"STRING: %s",tmp3); */
				
				sql->escape_string(tmp4, tmp3, strlen(tmp3)); /* escape the string */
/*				eventlog(eventlog_level_trace,__FUNCTION__,"ESCAPE STRING: %s",tmp4); */
				
				for (j=0, tmp2++; tmp4[j]; j++, tmp2++) *tmp2 = tmp4[j]; /* add 'escaped string' to 'escape' */
				
				*tmp2 = '\''; /* add single quote to end after adding 'escaped string' */
			}
		}
		*tmp2 = '\0';
/*		eventlog(eventlog_level_trace,__FUNCTION__,"ESCAPED COMMAND: %s",escape); */
		
		xfree(tmp1);
		xfree(tmp4);
	}
}

#endif /* WITH_SQL */