#ifndef HEAP_H_
#define HEAP_H_

#include <heap/_liballoc.h>
#include <mango/types.h>
#include <stddef.h>

typedef enum heap_result {
	HEAP_OK = 0,
	HEAP_ERR_NO_MEMORY,
	HEAP_ERR_INVALID_ARGUMENT,
} heap_result_t;

typedef struct heap {
	kern_handle_t heap_region;
	/* amount of space requested from the heap by the user */
	size_t heap_req_alloc;
	/* amount of space requested from the system by the heap */
	size_t heap_sys_alloc;
	/* base address of the heap */
	virt_addr_t heap_base;

	union {
		struct {
			struct liballoc_major *l_memRoot;
			struct liballoc_major *l_bestBet;

			unsigned int l_pageSize;
			unsigned int l_pageCount;
			unsigned long long l_allocated;
			unsigned long long l_inuse;

			long long l_warningCount;
			long long l_errorCount;
			long long l_possibleOverruns;
		} heap_liballoc;
	};
} heap_t;

extern kern_status_t heap_init(heap_t *heap, size_t size);
extern kern_status_t heap_destroy(heap_t *heap);

extern void *heap_alloc(heap_t *heap, size_t sz);
extern void *heap_realloc(heap_t *heap, void *p, size_t sz);
extern void *heap_calloc(heap_t *heap, size_t num, size_t itemsz);
extern void heap_free(heap_t *heap, void *p);

extern void *heap_expand(heap_t *heap, size_t size);

#endif