/* Copyright (C) 2013 BMW Group
 * Author: Manfred Bathelt (manfred.bathelt@bmw.de)
 * Author: Juergen Gehring (juergen.gehring@bmw.de)
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DBusFunctionalHash.h"

#include <murmurhash/MurmurHash3.h>

#include <cassert>
#include <cstring>


/*
 * @see http://code.google.com/p/smhasher/
 */
#define SMHASHER_SEED_VALUE			0xc70f6907UL


namespace std {

size_t hash< pair<const char*, const char*> >::operator()(const pair<const char*, const char*>& t) const {
	const char* a = t.first;
	const char* b = t.second;

	assert(a);
	assert(b);

	uint32_t seed = static_cast<uint32_t>(SMHASHER_SEED_VALUE);
	MurmurHash3_x86_32(a, strlen(a), seed, &seed);
	MurmurHash3_x86_32(b, strlen(b), seed, &seed);

	return static_cast<size_t>(seed);
}


size_t hash< pair<string, string> >::operator()(const pair<string, string>& t) const {
	const string& a = t.first;
	const string& b = t.second;

	uint32_t seed = static_cast<uint32_t>(SMHASHER_SEED_VALUE);
	MurmurHash3_x86_32(a.c_str(), a.length(), seed, &seed);
	MurmurHash3_x86_32(b.c_str(), b.length(), seed, &seed);

	return static_cast<size_t>(seed);
}


size_t hash< tuple<string, string, string> >::operator()(const tuple<string, string, string>& t) const {
	const string& a = get<0>(t);
	const string& b = get<1>(t);
	const string& c = get<2>(t);

	uint32_t seed = static_cast<uint32_t>(SMHASHER_SEED_VALUE);
	MurmurHash3_x86_32(a.c_str(), a.length(), seed, &seed);
	MurmurHash3_x86_32(b.c_str(), b.length(), seed, &seed);
	MurmurHash3_x86_32(c.c_str(), c.length(), seed, &seed);

	return static_cast<size_t>(seed);
}

size_t hash< tuple<string, string, string, bool> >::operator()(const tuple<string, string, string, bool>& t) const {
    const string& a = get<0>(t);
    const string& b = get<1>(t);
    const string& c = get<2>(t);
    const bool d = get<3>(t);

    uint32_t seed = static_cast<uint32_t>(SMHASHER_SEED_VALUE);
    MurmurHash3_x86_32(a.c_str(), a.length(), seed, &seed);
    MurmurHash3_x86_32(b.c_str(), b.length(), seed, &seed);
    MurmurHash3_x86_32(c.c_str(), c.length(), seed, &seed);
    MurmurHash3_x86_32(&d, sizeof(bool), seed, &seed);

    return static_cast<size_t>(seed);
}

size_t hash< tuple<string, string, string, int> >::operator()(const tuple<string, string, string, int>& t) const {
    const string& a = get<0>(t);
    const string& b = get<1>(t);
    const string& c = get<2>(t);
    const int d = get<3>(t);

    uint32_t seed = static_cast<uint32_t>(SMHASHER_SEED_VALUE);
    MurmurHash3_x86_32(a.c_str(), a.length(), seed, &seed);
    MurmurHash3_x86_32(b.c_str(), b.length(), seed, &seed);
    MurmurHash3_x86_32(c.c_str(), c.length(), seed, &seed);
    MurmurHash3_x86_32(&d, sizeof(d), seed, &seed);

    return static_cast<size_t>(seed);
}


size_t hash< tuple<string, string, string, string> >::operator()(const tuple<string, string, string, string>& t) const {
	const string& a = get<0>(t);
	const string& b = get<1>(t);
	const string& c = get<2>(t);
	const string& d = get<3>(t);

	uint32_t seed = static_cast<uint32_t>(SMHASHER_SEED_VALUE);
	MurmurHash3_x86_32(a.c_str(), a.length(), seed, &seed);
	MurmurHash3_x86_32(b.c_str(), b.length(), seed, &seed);
	MurmurHash3_x86_32(c.c_str(), c.length(), seed, &seed);
	MurmurHash3_x86_32(d.c_str(), d.length(), seed, &seed);

	return static_cast<size_t>(seed);
}


bool equal_to< pair<const char*, const char*> >::operator()(const pair<const char*, const char*>& a,
															const pair<const char*, const char*>& b) const {
	if (a.first == b.first && a.second == b.second)
		return true;

	return !strcmp(a.first, b.first) && !strcmp(a.second, b.second);
}

}  // namespace std