#include "am_handler.h"
#include "g2c_helpers.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static gchar *
am_read_line (FILE *file)
{
  /* Reads a line of a file (until a newline) */
  GString *line = g_string_new ("");
  gchar   *result = NULL;
  gchar    buf[1] = {'\0'};

  while (!feof (file))
    {
      fread (buf, 1, 1, file);
      if (buf[0] != '\n')
	{
	  g_string_append_c (line, buf[0]);
	}
      else break;
    }

  result = g_strdup (line->str);
  g_string_free (line, TRUE);

  return result;
}

amHandler *
am_handler_new (const gchar *makefile, const gchar *package)
{
  /* Create a new Automake handler */
  amHandler *handler = NULL;
  gint       i       = 0;
  gchar     *line    = NULL;
  gchar     *search_string = NULL;
  gchar     *rest_of_line  = NULL;
  gchar    **tokens        = NULL;
  gboolean   in_decl       = FALSE;

  g_assert (makefile != NULL);

  handler = g_new0 (amHandler, 1);
  handler->makefile = fopen (makefile, "r+");
  
  /* Make sure the file is open */
  g_assert (handler->makefile != NULL);

  handler->package = g_strdup (package);
  search_string = g_strdup_printf ("%s_SOURCES", package);

  /* Initialize the GList */
  handler->files = NULL;

  /* Load the names of the files that are in package_SOURCES.
   * Start by finding the package_SOURCES line. */
  
  while (!feof (handler->makefile))
    {
      line = am_read_line (handler->makefile);
      
      if (in_decl)
	{
	  tokens = g_strsplit (line, " ", 0);
	  
	  /* Check for non-\ strings. Add them to the list of files */
	  while (tokens[i] != NULL)
	    {
	      if ((tokens[i][0] != '\\') && (tokens[i][0] != '='))
		{
		  g_list_append (handler->files, g_strdup (g_strstrip (tokens[i])));
		}
	    }
	  g_strfreev (tokens);
	}
      else
	{
	  /* Does this line have the package_SOURCES declaration? */
	  if (strstr (line, search_string) != NULL)
	    {
	      /* We found it! Grab anything at the end of the line,
	       * up to a "\" character 
	       */
	      rest_of_line = strstr (line, search_string);
	      rest_of_line = rest_of_line + sizeof(search_string)/sizeof(gchar);
	      tokens = g_strsplit (rest_of_line, " ", 0);
	      
	      /* Check for non-\ strings. Add them to the list of files */
	      while (tokens[i] != NULL)
		{
		  if ((tokens[i][0] != '\\') && (tokens[i][0] != '='))
		    {
		      g_list_append (handler->files, g_strdup (g_strstrip (tokens[i])));
		    }
		}
	      g_strfreev (tokens);
	      
	      in_decl = TRUE;
	    }
	}
  
      g_free (line);
    }

  g_free (search_string);
  
  return handler;
}

void       
am_handler_add_file (const gchar *filename)
{
  /* Add this file to the list of files to be handled in the 
   * package_SOURCES portion of the makefile  */

  
}

void       
am_handler_destroy (amHandler *handler)
{
  /* Close the makefile */
  g_assert (handler->makefile);
  
  fclose (handler->makefile);

  if (handler->package != NULL) 
    g_free (handler->package);

  g_list_foreach (handler->files,
		  g2c_list_element_free_cb,
		  NULL);

  g_list_free (handler->files);

  /* Free memory associated with the handler */
  g_free (handler);
}