#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <Eeze_Udev.h>
#include "eeze_udev_private.h"

/**
 * Walks up the device chain starting at @p syspath,
 * checking each device for @p sysattr with (optional) @p value.
 *
 * @param syspath The /sys/ path of the device to start at, with or without the /sys/
 * @param sysattr The attribute to find
 * @param value OPTIONAL: The value that @p sysattr should have, or NULL
 *
 * @return If the sysattr (with value) is found, returns TRUE.  Else, false.
 */
EAPI Eina_Bool
eeze_udev_walk_check_sysattr(const char *syspath, const char *sysattr, const char *value)
{
     struct udev *udev;
      struct udev_device *device, *child, *parent;
      Eina_Strbuf *sbuf;
      const char *test = NULL;

      if (!syspath) return 0;
      udev = udev_new();
      if (!udev) return 0;
      
      sbuf = eina_strbuf_new();
      if (!strstr(syspath, "/sys/"))
        eina_strbuf_append(sbuf, "/sys/");
      eina_strbuf_append(sbuf, syspath);

      device = udev_device_new_from_syspath(udev, eina_strbuf_string_get(sbuf));

      for (parent = device; parent; child = parent, parent = udev_device_get_parent(child))
        {
           if ((test = udev_device_get_sysattr_value(parent, sysattr)))
             {
                if (value)
                  {
                     if (!strcmp(test, value))
                       {
                          eina_strbuf_free(sbuf);
                          udev_device_unref(device);
                          return 1;
                       }
                  }
                else
                  {
                     eina_strbuf_free(sbuf);
                     udev_device_unref(device);
                     return 1;
                  }
             }
        }
   eina_strbuf_free(sbuf);
   udev_device_unref(device);
   return 0;
}

/**
 * Walks up the device chain starting at @p syspath,
 * checking each device for @p sysattr, and returns the value if found.
 *
 * @param syspath The /sys/ path of the device to start at, with or without the /sys/
 * @param sysattr The attribute to find
 *
 * @return The value of @p sysattr if found, or NULL
 */
EAPI const char*
eeze_udev_walk_get_sysattr(const char *syspath, const char *sysattr)
{
     struct udev *udev;
      struct udev_device *device, *child, *parent;
      Eina_Strbuf *sbuf;
      const char *test = NULL;

      if (!syspath) return NULL;
      udev = udev_new();
      if (!udev) return NULL;
      
      sbuf = eina_strbuf_new();
      if (!strstr(syspath, "/sys/"))
        eina_strbuf_append(sbuf, "/sys/");
      eina_strbuf_append(sbuf, syspath);

      device = udev_device_new_from_syspath(udev, eina_strbuf_string_get(sbuf));

      for (parent = device; parent; child = parent, parent = udev_device_get_parent(child))
        {
           if ((test = udev_device_get_sysattr_value(parent, sysattr)))
             {
                eina_strbuf_free(sbuf);
                test = eina_stringshare_add(test);
                udev_device_unref(device);
                return test;
             }
        }
   eina_strbuf_free(sbuf);
   udev_device_unref(device);
   return NULL;
}