#include "evas_common.h"
#include "evas_private.h"
#include "Evas.h"

int _evas_alloc_error = 0;
static int _evas_debug_init = 0;
static int _evas_debug_show = 0;
static int _evas_debug_abort = 0;

/**
 * Return if any allocation errors have occured during the prior function
 * @return The allocation error flag
 * 
 * This function will return if any memory allocation errors occured during,
 * and what kind they were. The return value will be one of 
 * EVAS_ALLOC_ERROR_NONE, EVAS_ALLOC_ERROR_FATAL or EVAS_ALLOC_ERROR_RECOVERED
 * with each meaning something different.
 * 
 * EVAS_ALLOC_ERROR_NONE means that no errors occured at all and the function
 * worked as expected.
 * 
 * EVAS_ALLOC_ERROR_FATAL means the function was completely unable to perform
 * its job and will  have  exited as cleanly as possible. The programmer
 * should consider this as a sign of very low memory and should try and safely
 * recover from the prior functions failure (or try free up memory elsewhere
 * and try again after more memory is freed).
 * 
 * EVAS_ALLOC_ERROR_RECOVERED means that an allocation error occured, but was
 * recovered from by evas finding memory of its own it has allocated and
 * freeing what it sees as not really usefully allocated memory. What is freed
 * may vary. Evas may reduce the resolution of images, free cached images or
 * fonts, trhow out pre-rendered data, reduce the complexity of change lists
 * etc. Evas and the program will function as per normal after this, but this
 * is a sign of low memory, and it is suggested that the program try and
 * identify memory it doesn't need, and free it.
 * 
 * Example:
 * @code
 * extern Evas_Object *object;
 * void callback (void *data, Evas *e, Evas_Object *obj, void *event_info);
 * 
 * evas_object_event_callback_add(object, EVAS_CALLBACK_MOUSE_DOWN, callback, NULL);
 * if (evas_alloc_error() == EVAS_ALLOC_ERROR_FATAL)
 *   {
 *     fprintf(stderr, "ERROR: Completely unable to attach callabck. Must\n");
 *     fprintf(stderr, "       destroy object now as it cannot be used.\n");
 *     evas_object_del(object);
 *     object = NULL;
 *     fprintf(stderr, "WARNING: Memory is really low. Cleaning out RAM.\n");
 *     my_memory_cleanup();
 *   }
 * if (evas_alloc_error() == EVAS_ALLOC_ERROR_RECOVERED)
 *   {
 *     fprintf(stderr, "WARNING: Memory is really low. Cleaning out RAM.\n");
 *     my_memory_cleanup();
 *   }
 * @endcode
 */
int
evas_alloc_error(void)
{
   return _evas_alloc_error;
}

/* free cached items only in ram for speed reasons. return 0 if cant free */
int
evas_mem_free(int mem_required)
{
   return 0;
}

/* start reducing quality of images etc. return 0 if cant free anything */
int
evas_mem_degrade(int mem_required)
{
   return 0;
}

void *
evas_mem_calloc(int size)
{
   void *ptr;
   
   ptr = calloc(1, size);
   if (ptr) return ptr;
   MERR_BAD();
   while ((!ptr) && (evas_mem_free(size))) ptr = calloc(1, size);
   if (ptr) return ptr;
   while ((!ptr) && (evas_mem_degrade(size))) ptr = calloc(1, size);	
   if (ptr) return ptr;
   MERR_FATAL();
   return NULL;
}

void
evas_debug_error(void)
{
   if (!_evas_debug_init)
     {
	if (getenv("EVAS_DEBUG_SHOW")) _evas_debug_show = 1;
	if (getenv("EVAS_DEBUG_ABORT")) _evas_debug_abort = 1;
	_evas_debug_init = 1;
     }
   if (_evas_debug_show)
     fprintf(stderr, 
	     "*** EVAS ERROR: Evas Magic Check Failed!!!\n");
}

void
evas_debug_input_null(void)
{
   if (!_evas_debug_init)
     {
	if (getenv("EVAS_DEBUG_SHOW")) _evas_debug_show = 1;
	if (getenv("EVAS_DEBUG_ABORT")) _evas_debug_abort = 1;
	_evas_debug_init = 1;
     }
   if (_evas_debug_show)
     fprintf(stderr, 
	     "  Input object pointer is NULL!\n");
}

void
evas_debug_magic_null(void)
{
   if (!_evas_debug_init)
     {
	if (getenv("EVAS_DEBUG_SHOW")) _evas_debug_show = 1;
	if (getenv("EVAS_DEBUG_ABORT")) _evas_debug_abort = 1;
	_evas_debug_init = 1;
     }
   if (_evas_debug_show)
     fprintf(stderr, 
	     "  Input object is zero'ed out (maybe a freed object or zero-filled RAM)!\n");
}

void
evas_debug_magic_wrong(DATA32 expected, DATA32 supplied)
{
   if (!_evas_debug_init)
     {
	if (getenv("EVAS_DEBUG_SHOW")) _evas_debug_show = 1;
	if (getenv("EVAS_DEBUG_ABORT")) _evas_debug_abort = 1;
	_evas_debug_init = 1;
     }
   if (_evas_debug_show)
     fprintf(stderr, 
	     "  Input object is wrong type\n"
	     "    Expected: %08x - %s\n"
	     "    Supplied: %08x - %s\n",
	     expected, evas_debug_magic_string_get(expected),
	     supplied, evas_debug_magic_string_get(supplied));
   if (_evas_debug_abort) abort();
}

char *
evas_debug_magic_string_get(DATA32 magic)
{
   switch (magic)
     {
      case MAGIC_EVAS:
	return "Evas";
	break;
      case MAGIC_OBJ:
	return "Evas_Object";
	break;
      case MAGIC_OBJ_RECTANGLE:
	return "Evas_Object (Rectangle)";
	break;
      case MAGIC_OBJ_LINE:
	return "Evas_Object (Line)";
	break;
      case MAGIC_OBJ_GRADIENT:
	return "Evas_Object (Gradient)";
	break;
      case MAGIC_OBJ_POLYGON:
	return "Evas_Object (Polygon)";
	break;
      case MAGIC_OBJ_IMAGE:
	return "Evas_Object (Image)";
	break;
      case MAGIC_OBJ_TEXT:
	return "Evas_Object (Text)";
	break;
      case MAGIC_OBJ_SMART:
	return "Evas_Object (Smart)";
	break;
      default:
	return "<UNKNOWN>";
     };
   return "<UNKNOWN>";
}