#include "CDBehaviorParameterTable.h"
#include "GeneralUtils.h"

#include "Game.h"
#include "dLogger.h"
#include "dServer.h"

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/map.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <functional>
#include <utility>
#include <chrono>

typedef size_t    KeyType;
typedef float  MappedType;
typedef std::pair<const KeyType, MappedType> ValueType;

typedef boost::interprocess::allocator<ValueType, boost::interprocess::managed_shared_memory::segment_manager> ShmemAllocator;

typedef boost::interprocess::map<KeyType, MappedType, std::less<KeyType>, ShmemAllocator> CDBehaviorParameterMap;

CDBehaviorParameterMap *table = nullptr;

boost::interprocess::managed_shared_memory segment;
ShmemAllocator* alloc_inst;
boost::interprocess::offset_ptr<CDBehaviorParameterMap> m;

//! Constructor
CDBehaviorParameterTable::CDBehaviorParameterTable(void) {
	try {
		segment = boost::interprocess::managed_shared_memory(boost::interprocess::open_read_only, "CDBehaviorParameterTable");

		alloc_inst = new ShmemAllocator(segment.get_segment_manager());

		m = segment.find<CDBehaviorParameterMap>("CDBehaviorParameter").first;

		if (m == nullptr) {
			Game::logger->Log("CDBehaviorParameterTable", "CDBehaviorParameter segment is nullptr!\n");
		}

		// Load the entire table into m_Entries
		/*for (auto it = m->begin(); it != m->end(); ++it) {
			m_Entries.insert(std::make_pair(it->first, it->second));
		}*/
	} catch (std::exception &e) {
		// Not open, we are master
	}
}

//! Destructor
CDBehaviorParameterTable::~CDBehaviorParameterTable(void) { }

//! Returns the table's name
std::string CDBehaviorParameterTable::GetName(void) const {
	return "BehaviorParameter";
}

float CDBehaviorParameterTable::GetEntry(const uint32_t behaviorID, const std::string& name, const float defaultValue) 
{
	size_t hash = 0;
	GeneralUtils::hash_combine(hash, behaviorID);
	GeneralUtils::hash_combine(hash, name);

	// Search for specific parameter
	try {
		/*boost::interprocess::managed_shared_memory segment(boost::interprocess::open_read_only, "CDBehaviorParameterTable");

		// If the segment manager is not null, then the segment exists
		// Get the table from the segment
		ShmemAllocator alloc_inst (segment.get_segment_manager());

		boost::interprocess::offset_ptr<CDBehaviorParameterMap> m = segment.find<CDBehaviorParameterMap>("CDBehaviorParameter").first;

		if (m == nullptr) {
			Game::logger->Log("CDBehaviorParameterTable", "CDBehaviorParameter segment is nullptr!\n");

			return defaultValue;
		}*/

		// Start a timer
		auto start = std::chrono::high_resolution_clock::now();

		auto it = m->find(hash);

		bool found = it != m->end();

		// End the timer
		auto end = std::chrono::high_resolution_clock::now();

		// Get duraction
		auto duration = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start);
		
		// Reset the timer
		/*start = std::chrono::high_resolution_clock::now();

		auto nativeIt = m_Entries.find(hash);

		bool nativeFound = nativeIt != m_Entries.end();

		// End the timer
		end = std::chrono::high_resolution_clock::now();

		// Get duraction
		auto nativeDuration = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start);*/

		//Game::logger->Log("CDBehaviorParameterTable", "Duration: (sm) %fms / (m) %fms -> %f\n", duration.count() / 1000000.0f, nativeDuration.count() / 1000000.0f, (double) duration.count() / (double) nativeDuration.count());

		if (found) {
			return it->second;
		}

		return defaultValue;
	}
	catch (std::exception &e) {
		Game::logger->Log("CDBehaviorParameterTable", "Failed to find entry for behaviorID: %d, parameterID: %s\n%e\n", behaviorID, name.c_str(), e.what());

		return defaultValue;
	}
}

void CDBehaviorParameterTable::CreateSharedMap()
{
	boost::interprocess::shared_memory_object::remove("CDBehaviorParameterTable");

	Game::logger->Log("CDBehaviorParameterTable", "Create shared memory segment.\n");

	// Create the segment, TODO: calculate size
	boost::interprocess::managed_shared_memory segment(boost::interprocess::create_only, "CDBehaviorParameterTable", 40 * 1000 * 1000);

	ShmemAllocator alloc_inst (segment.get_segment_manager());

	table = segment.construct<CDBehaviorParameterMap>("CDBehaviorParameter") (std::less<KeyType>(), alloc_inst);

	auto tableData = CDClientDatabase::ExecuteQuery("SELECT * FROM BehaviorParameter");

	size_t hash = 0;

	while (!tableData.eof()) {
		hash = 0;

		int32_t behaviorID = tableData.getIntField(0, -1);
		std::string parameterID = tableData.getStringField(1, "");
		
		GeneralUtils::hash_combine(hash, behaviorID);
		GeneralUtils::hash_combine(hash, parameterID);

		float value = tableData.getFloatField(2, -1.0f);

		table->insert(ValueType(hash, value));

		tableData.nextRow();
	}

	tableData.finalize();
}