#ifndef MEMGRAPH_UTILS_HASHING_FNV_FNV64_HPP
#define MEMGRAPH_UTILS_HASHING_FNV_FNV64_HPP

#include <cstdlib>
#include <string>

#define OFFSET_BASIS64 14695981039346656037u
#define FNV_PRIME64 1099511628211u

uint64_t fnv64(const unsigned char* const data, size_t n)
{
    uint64_t hash = OFFSET_BASIS64; 

    for(size_t i = 0; i < n; ++i)
        hash = (hash * FNV_PRIME64) xor (uint64_t)data[i];

    return hash;
}

template <class T>
uint64_t fnv64(const T& data)
{
    return fnv64(&data, sizeof(data));
}

template<> uint64_t fnv64(const std::string& data)
{
    return fnv64((const unsigned char*)data.c_str(), data.size());
}

uint64_t fnv1a64(const unsigned char* const data, size_t n)
{
    uint64_t hash = OFFSET_BASIS64; 

    for(size_t i = 0; i < n; ++i)
        hash = (hash xor (uint64_t)data[i]) * FNV_PRIME64;

    return hash;
}

template <class T>
uint64_t fnv1a64(const T& data)
{
    return fnv1a64(&data, sizeof(data));
}

template<> uint64_t fnv1a64(const std::string& data)
{
    return fnv1a64((const unsigned char*)data.c_str(), data.size());
}

#endif