#ifndef AMALGAM_HASH_MAP_H
#define AMALGAM_HASH_MAP_H

#include "defs.h"
#include "misc.h"
#include "types.h"
#include "buffer.h"
#include "buffer_view.h"

typedef struct HashMap HashMap;

typedef int(*HashMapCompare)(const void *a, const void *b);
typedef usize(*HashMapHash)(const u8 *data, usize size);

struct HashMap {
    ArenaAllocator *allocator; /* borrowed */
    Buffer/*HashMapBucket*/ buckets;
    usize value_type_size;
    usize num_elements;
    HashMapCompare compare_func;
    HashMapHash hash_func;
};

#define HashMapType(key_type, value_type) __attribute__((annotate(#key_type", "#value_type))) HashMap

CHECK_RESULT int hash_map_init(HashMap *self, ArenaAllocator *allocator, usize value_type_size, HashMapCompare key_compare_func, HashMapHash key_hash_func);
/*
Not thread-safe.
Expected @value size to be @self->value_type_size.
*/
CHECK_RESULT int hash_map_insert(HashMap *self, BufferView key, void *value);
/*
Thread-safe unless @hash_map_insert is used in another thread at the same time.
Expected @value size to be @self->value_type_size.
*/
CHECK_RESULT bool hash_map_get(HashMap *self, BufferView key, void *value);

int hash_map_compare_string(const void *a, const void *b);

#endif