#include <pybind11/pybind11.h>
#include <pybind11/stl_bind.h>
#include <pybind11/functional.h>
#include <pybind11/stl.h>
    
namespace py = pybind11;

#include <Python.h>
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <thread>
#include <stdint.h>
#include <vector>
#include <algorithm>

#include "linux_platform.h"
#include "knx/bau57B0.h"
#include "knx/group_object_table_object.h"

LinuxPlatform* platform = 0;
Bau57B0* bau = 0;

bool running = false;

static void loop()
{
    while (running)
    {
        bau->loop();
        delayMicroseconds(100);
    }
}

static std::thread workerThread;
static std::vector<std::string> argsVector;
static std::vector<const char*> argv;

struct StdStringCStrFunctor
{
	const char* operator() (const std::string& str) { return str.c_str(); }
};

static void Prepare(std::vector<std::string> args)
{
    // copy args so we control the livetime of the char*
    argsVector = args;
    for(int i = 0; i < args.size(); i++)
        printf("%s\n", args[i].c_str());

    argv = std::vector<const char*>(argsVector.size());
    std::transform(argsVector.begin(), argsVector.end(), argv.begin(), StdStringCStrFunctor());

    platform = new LinuxPlatform();
    platform->cmdLineArgs(argv.size(), const_cast<char**>(argv.data()));
    bau = new Bau57B0(*platform);
}

static void Destroy()
{
    delete platform;
    delete bau;
    platform = 0;
    bau = 0;
}

static void ReadMemory()
{
    if (!bau)
        return;

    bau->readMemory();
}

static void Start()
{
    if (running)
        return;
    
    if (!bau)
        return;

    running = true;
    
    bau->enabled(true);

    workerThread = std::thread(loop);
    workerThread.detach();
}

static void Stop()
{
    if (!running)
        return;
    
    running = false;
    bau->writeMemory();
    bau->enabled(false);
    
    workerThread.join();
}

static bool ProgramMode(bool value)
{
    if (!bau)
        return false;

    bau->deviceObject().progMode(value);
    return bau->deviceObject().progMode();
}

static bool ProgramMode()
{
    if (!bau)
        return false;

    return bau->deviceObject().progMode();
}

static bool Configured()
{
    if (!bau)
        return false;

    return bau->configured();
}


PYBIND11_MODULE(knx, m) 
{
    m.doc() = "wrapper for knx device lib";    // optional module docstring

    m.def("Start", &Start, "Start knx handling thread.");
    m.def("Stop", &Stop, "Stop knx handling thread.");
	m.def("Prepare", &Prepare, "Allocated needed objects.");
	m.def("Destroy", &Destroy, "Free object allocated by Prepare.");
    m.def("ProgramMode", (bool(*)())&ProgramMode, "get programing mode active.");
    m.def("ProgramMode", (bool(*)(bool))&ProgramMode, "Activate / deactivate programing mode.");
    m.def("Configured", (bool(*)())&Configured, "get configured status."); 
    m.def("ReadMemory", &ReadMemory, "read memory from flash file");
    m.def("FlashFilePath", []() 
	{
		if(!platform)
			return std::string("");

		return platform->flashFilePath(); 
	});
    m.def("FlashFilePath", [](std::string path) 
	{
		if(!platform)
			return;

		platform->flashFilePath(path); 
	});
    m.def("GetGroupObject", [](uint16_t goNr) 
	{
		if(!bau || goNr > bau->groupObjectTable().entryCount())
			return (GroupObject*)nullptr;

		return &bau->groupObjectTable().get(goNr); 
	}, py::return_value_policy::reference);
    
    py::class_<GroupObject>(m, "GroupObject", py::dynamic_attr())
        .def(py::init())
        .def("asap", &GroupObject::asap)
        .def("size", &GroupObject::valueSize)
        .def_property("value",
            [](GroupObject& go) { return py::bytes((const char*)go.valueRef(), go.valueSize()); },
            [](GroupObject& go, py::bytes bytesValue) 
            {
                const auto value = static_cast<std::string>(bytesValue);
                if (value.length() != go.valueSize())
                    throw std::length_error("bytesValue");
            
                auto valueRef = go.valueRef();
                memcpy(valueRef, value.c_str(), go.valueSize());
                go.objectWritten();
            })
		.def_property("callback",
			[](GroupObject& go) 
			{
				return go.callback();
			},
			[](GroupObject& go, GroupObjectUpdatedHandler handler)
			{
				go.callback(handler);
			}
			)
        .def("callBack", (void(GroupObject::*)(GroupObjectUpdatedHandler))&GroupObject::callback);
}