#include <boost/bind.hpp>
#include <boost/array.hpp>
#if BOOST_VERSION < 104400
#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4))
#undef BOOST_HAS_RVALUE_REFS
#endif
#endif
#include <boost/thread.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/deadline_timer.hpp>

#include "Dim.h"
#include "Event.h"
#include "Shell.h"
#include "StateMachineDim.h"
#include "Connection.h"
#include "Configuration.h"
#include "Console.h"
#include "Converter.h"

#include "tools.h"

#include "LocalControl.h"


namespace ba    = boost::asio;
namespace bs    = boost::system;
namespace dummy = ba::placeholders;

using namespace std;

// ------------------------------------------------------------------------

class ConnectionFSC : public Connection
{
    boost::asio::streambuf fBuffer;

    bool fIsVerbose;

protected:

    virtual void UpdateTemp(float, const vector<float> &)
    {
    }

    virtual void UpdateHum(float, const vector<float>&)
    {
    }

    virtual void UpdateVolt(float, const vector<float>&)
    {
    }

    virtual void UpdateCur(float, const vector<float>&)
    {
    }

    /*
    virtual void UpdateError()
    {
        if (!fIsVerbose)
            return;

        Out() << endl << kRed << "Error received:" << endl;
        Out() << fError;
        if (fIsHexOutput)
            Out() << Converter::GetHex<uint16_t>(fError, 16) << endl;
    }
*/

private:
    void HandleReceivedData(const bs::error_code& err, size_t bytes_received, int /*type*/)
    {
        // Do not schedule a new read if the connection failed.
        if (bytes_received==0 || err)
        {
            if (err==ba::error::eof)
                Warn("Connection closed by remote host (FTM).");

            // 107: Transport endpoint is not connected (bs::error_code(107, bs::system_category))
            // 125: Operation canceled
            if (err && err!=ba::error::eof &&                     // Connection closed by remote host
                err!=ba::error::basic_errors::not_connected &&    // Connection closed by remote host
                err!=ba::error::basic_errors::operation_aborted)  // Connection closed by us
            {
                ostringstream str;
                str << "Reading from " << URL() << ": " << err.message() << " (" << err << ")";// << endl;
                Error(str);
            }
            PostClose(err!=ba::error::basic_errors::operation_aborted);
            return;
        }

        if (fIsVerbose)
           Out() << kBold << "Received:" << endl;

        istream is(&fBuffer);

        int state = 0;
        bool values = false;
        int offset = 0;
/*
        string buffer;
        while (getline(is, buffer, '\n'))
        {
            if (fIsVerbose)
                Out() << buffer << endl;

            buffer = Tools::Trim(buffer);

            if (buffer.empty())
                continue;

            if (buffer.substr(0, 4)=="end.")
                break;

            if (buffer.substr(0, 8)=="status: ")
            {
            }

            if (buffer.substr(0, 8)=="time_s: ")
            {
            }

            if (buffer.substr(0, 8)=="VOLTAGES")
                state = 1;

            if (buffer.substr(0, 11)=="RESISTANCES")
                state = 2;

            if (state==1 && buffer.substr(0, 7)=="values:")
            {
            }

            if (state==2 && buffer.substr(0, 7)=="values:")
            {
                values = true;
                continue;
            }

            istringtream str(buffer);
            for (int i=0; i<8; i++)
            {
                float f;
                str >> f;
                offset += 8;
            }
        }
*/
/*
"status: 00000538 \n"
"time_s: 764.755 \n"
"VOLTAGES \n"
" \n"
"enable:11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111  00001111 \n"
"  done:11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111  00001111 \n"
"values:0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 \n"
"RESISTANCES \n"
" \n"
"enable:11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 \n"
"  done:11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111 \n"
"values: \n"
"1000.16 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 \n"
"3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 \n"
"1197.07 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 \n"
" 558.59  677.92  817.26  989.39 1200.35 1503.06 1799.90 2204.18 \n"
"3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 \n"
"3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 \n"
"3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 \n"
"3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 3199.99 \n"
"end.\n";

*/
        StartRead();
    }

    void StartRead()
    {
        ba::async_read_until(*this, fBuffer, "end.\n",
                             boost::bind(&ConnectionFSC::HandleReceivedData, this,
                                         dummy::error, dummy::bytes_transferred, 0));

        // FIXME: Add timeout here
    }

    // This is called when a connection was established
    void ConnectionEstablished()
    {
        PostMessage("m", 1);

        fBuffer.prepare(10000);
        StartRead();
    }

/*
    void HandleReadTimeout(const bs::error_code &error)
    {
        if (error==ba::error::basic_errors::operation_aborted)
            return;

        if (error)
        {
            ostringstream str;
            str << "Read timeout of " << URL() << ": " << error.message() << " (" << error << ")";// << endl;
            Error(str);

            PostClose();
            return;

        }

        if (!is_open())
        {
            // For example: Here we could schedule a new accept if we
            // would not want to allow two connections at the same time.
            return;
        }

        // Check whether the deadline has passed. We compare the deadline
        // against the current time since a new asynchronous operation
        // may have moved the deadline before this actor had a chance
        // to run.
        if (fInTimeout.expires_at() > ba::deadline_timer::traits_type::now())
            return;

        Error("Timeout reading data from "+URL());

        PostClose();
    }
*/

public:
    ConnectionFSC(ba::io_service& ioservice, MessageImp &imp) : Connection(ioservice, imp()),
        fIsVerbose(true)
    {
        SetLogStream(&imp);
    }

    void SetVerbose(bool b)
    {
        fIsVerbose = b;
    }
};

// ------------------------------------------------------------------------

#include "DimDescriptionService.h"

class ConnectionDimFSC : public ConnectionFSC
{
private:

    DimDescribedService fDimTemp;
    DimDescribedService fDimHum;
    DimDescribedService fDimVolt;
    DimDescribedService fDimCurrent;

    void Update(DimDescribedService &svc, vector<float> data, float time) const
    {
        data.insert(data.begin(), time);
        svc.setData(data.data(), data.size()*sizeof(float));
        svc.updateService();
    }

    void UpdateTemp(float time, const vector<float> &temp)
    {
        Update(fDimTemp, temp, time);
    }

    void UpdateHum(float time, const vector<float> &hum)
    {
        Update(fDimHum, hum, time);
    }

    void UpdateVolt(float time, const vector<float> &volt)
    {
        Update(fDimVolt, volt, time);
    }

    void UpdateCur(float time, const vector<float> &curr)
    {
        Update(fDimCurrent, curr, time);
    }

public:
    ConnectionDimFSC(ba::io_service& ioservice, MessageImp &imp) :
        ConnectionFSC(ioservice, imp),
        fDimTemp   ("FSC_CONTROL/TEMPERATURE", "F:1;F:64", ""),
        fDimHum    ("FSC_CONTROL/HUMIDITY",    "F:1;F:40", ""),
        fDimVolt   ("FSC_CONTROL/VOLTAGE",     "F:1;F:40", ""),
        fDimCurrent("FSC_CONTROL/CURRENT",     "F:1;F:4",  "")
    {
    }

    // A B [C] [D] E [F] G H [I] J K [L] M N O P Q R [S] T U V W [X] Y Z
};

// ------------------------------------------------------------------------

template <class T, class S>
class StateMachineFSC : public T, public ba::io_service, public ba::io_service::work
{
    int Wrap(boost::function<void()> f)
    {
        f();
        return T::GetCurrentState();
    }

    boost::function<int(const EventImp &)> Wrapper(boost::function<void()> func)
    {
        return boost::bind(&StateMachineFSC::Wrap, this, func);
    }

private:
    S fFSC;

    enum states_t
    {
        kStateDisconnected = 1,
        kStateConnected    = 2,
    };

    int Disconnect()
    {
        // Close all connections
        fFSC.PostClose(false);

        /*
         // Now wait until all connection have been closed and
         // all pending handlers have been processed
         poll();
         */

        return T::GetCurrentState();
    }

    int Reconnect(const EventImp &evt)
    {
        // Close all connections to supress the warning in SetEndpoint
        fFSC.PostClose(false);

        // Now wait until all connection have been closed and
        // all pending handlers have been processed
        poll();

        if (evt.GetBool())
            fFSC.SetEndpoint(evt.GetString());

        // Now we can reopen the connection
        fFSC.PostClose(true);

        return T::GetCurrentState();
    }

    int Execute()
    {
        // Dispatch (execute) at most one handler from the queue. In contrary
        // to run_one(), it doesn't wait until a handler is available
        // which can be dispatched, so poll_one() might return with 0
        // handlers dispatched. The handlers are always dispatched/executed
        // synchronously, i.e. within the call to poll_one()
        poll_one();

        return fFSC.IsConnected() ? kStateConnected : kStateDisconnected;
    }

    bool CheckEventSize(size_t has, const char *name, size_t size)
    {
        if (has==size)
            return true;

        ostringstream msg;
        msg << name << " - Received event has " << has << " bytes, but expected " << size << ".";
        T::Fatal(msg);
        return false;
    }

    int SetVerbosity(const EventImp &evt)
    {
        if (!CheckEventSize(evt.GetSize(), "SetVerbosity", 1))
            return T::kSM_FatalError;

        fFSC.SetVerbose(evt.GetBool());

        return T::GetCurrentState();
    }

public:
    StateMachineFSC(ostream &out=cout) :
        T(out, "FSC_CONTROL"), ba::io_service::work(static_cast<ba::io_service&>(*this)),
        fFSC(*this, *this)
    {
        // ba::io_service::work is a kind of keep_alive for the loop.
        // It prevents the io_service to go to stopped state, which
        // would prevent any consecutive calls to run()
        // or poll() to do nothing. reset() could also revoke to the
        // previous state but this might introduce some overhead of
        // deletion and creation of threads and more.

        // State names
        AddStateName(kStateDisconnected, "Disconnected",
                     "FSC board not connected via ethernet.");

        AddStateName(kStateConnected, "Connected",
                     "Ethernet connection to FSC established.");

        // Verbosity commands
        T::AddEvent("SET_VERBOSE", "B")
            (boost::bind(&StateMachineFSC::SetVerbosity, this, _1))
            ("set verbosity state"
             "|verbosity[bool]:disable or enable verbosity for received data (yes/no), except dynamic data");

        // Conenction commands
        AddEvent("DISCONNECT", kStateConnected)
            (boost::bind(&StateMachineFSC::Disconnect, this))
            ("disconnect from ethernet");

        AddEvent("RECONNECT", "O", kStateDisconnected, kStateConnected)
            (boost::bind(&StateMachineFSC::Reconnect, this, _1))
            ("(Re)connect ethernet connection to FTM, a new address can be given"
             "|[host][string]:new ethernet address in the form <host:port>");

        fFSC.StartConnect();
    }

    void SetEndpoint(const string &url)
    {
        fFSC.SetEndpoint(url);
    }

    bool SetConfiguration(const Configuration &conf)
    {
        SetEndpoint(conf.Get<string>("addr"));

        fFSC.SetVerbose(!conf.Get<bool>("quiet"));

        return true;
    }
};

// ------------------------------------------------------------------------

void RunThread(StateMachineImp *io_service)
{
    // This is necessary so that the StateMachien Thread can signal the
    // Readline to exit
    io_service->Run();
    Readline::Stop();
}

template<class S, class T>
int RunDim(Configuration &conf)
{
    WindowLog wout;

    /*
    static Test shell(conf.GetName().c_str(), conf.Get<int>("console")!=1);

    WindowLog &win  = shell.GetStreamIn();
    WindowLog &wout = shell.GetStreamOut();
    */

    ReadlineColor::PrintBootMsg(wout, conf.GetName(), false);


    if (conf.Has("log"))
        if (!wout.OpenLogFile(conf.Get<string>("log")))
            wout << kRed << "ERROR - Couldn't open log-file " << conf.Get<string>("log") << ": " << strerror(errno) << endl;

    // Start io_service.Run to use the StateMachineImp::Run() loop
    // Start io_service.run to only use the commandHandler command detaching
    StateMachineFSC<S, T> io_service(wout);
    if (!io_service.SetConfiguration(conf))
        return -1;

    io_service.Run();

    /*
    shell.SetReceiver(io_service);

    boost::thread t(boost::bind(RunThread, &io_service));
    // boost::thread t(boost::bind(&StateMachineFSC<S>::Run, &io_service));

    shell.Run();                 // Run the shell
    io_service.Stop();           // Signal Loop-thread to stop
    // io_service.Close();       // Obsolete, done by the destructor

    // Wait until the StateMachine has finished its thread
    // before returning and destroying the dim objects which might
    // still be in use.
    t.join();
    */

    return 0;
}

template<class T, class S, class R>
int RunShell(Configuration &conf)
{
    static T shell(conf.GetName().c_str(), conf.Get<int>("console")!=1);

    WindowLog &win  = shell.GetStreamIn();
    WindowLog &wout = shell.GetStreamOut();

    if (conf.Has("log"))
        if (!wout.OpenLogFile(conf.Get<string>("log")))
            win << kRed << "ERROR - Couldn't open log-file " << conf.Get<string>("log") << ": " << strerror(errno) << endl;

    StateMachineFSC<S, R> io_service(wout);
    if (!io_service.SetConfiguration(conf))
        return -1;

    shell.SetReceiver(io_service);

    boost::thread t(boost::bind(RunThread, &io_service));
    // boost::thread t(boost::bind(&StateMachineFSC<S>::Run, &io_service));

    if (conf.Has("exec"))
    {
        const vector<string> v = conf.Get<vector<string>>("exec");
        for (vector<string>::const_iterator it=v.begin(); it!=v.end(); it++)
            shell.Execute(*it);
    }

    shell.Run();                 // Run the shell
    io_service.Stop();           // Signal Loop-thread to stop
    // io_service.Close();       // Obsolete, done by the destructor

    // Wait until the StateMachine has finished its thread
    // before returning and destroying the dim objects which might
    // still be in use.
    t.join();

    return 0;
}

void SetupConfiguration(Configuration &conf)
{
    const string n = conf.GetName()+".log";

    po::options_description config("Program options");
    config.add_options()
        ("dns",       var<string>("localhost"), "Dim nameserver host name (Overwites DIM_DNS_NODE environment variable)")
        ("log,l",     var<string>(n), "Write log-file")
        ("no-dim,d",  po_bool(),      "Disable dim services")
        ("console,c", var<int>(),     "Use console (0=shell, 1=simple buffered, X=simple unbuffered)")
        ("exec,e",    vars<string>(), "Execute one or more scrips at startup")
        ;

    po::options_description control("FTM control options");
    control.add_options()
        ("addr,a",        var<string>("localhost:5000"),  "Network address of FTM")
        ("quiet,q",       po_bool(),  "Disable printing contents of all received messages (except dynamic data) in clear text.")
        ;

    conf.AddEnv("dns", "DIM_DNS_NODE");

    conf.AddOptions(config);
    conf.AddOptions(control);
}

/*
 Extract usage clause(s) [if any] for SYNOPSIS.
 Translators: "Usage" and "or" here are patterns (regular expressions) which
 are used to match the usage synopsis in program output.  An example from cp
 (GNU coreutils) which contains both strings:
  Usage: cp [OPTION]... [-T] SOURCE DEST
    or:  cp [OPTION]... SOURCE... DIRECTORY
    or:  cp [OPTION]... -t DIRECTORY SOURCE...
 */
void PrintUsage()
{
    cout <<
        "The ftmctrl controls the FTM (FACT Trigger Master) board.\n"
        "\n"
        "The default is that the program is started without user intercation. "
        "All actions are supposed to arrive as DimCommands. Using the -c "
        "option, a local shell can be initialized. With h or help a short "
        "help message about the usuage can be brought to the screen.\n"
        "\n"
        "Usage: fscctrl [-c type] [OPTIONS]\n"
        "  or:  fscctrl [OPTIONS]\n";
    cout << endl;
}

void PrintHelp()
{
    /* Additional help text which is printed after the configuration
     options goes here */

    /*
     cout << "bla bla bla" << endl << endl;
     cout << endl;
     cout << "Environment:" << endl;
     cout << "environment" << endl;
     cout << endl;
     cout << "Examples:" << endl;
     cout << "test exam" << endl;
     cout << endl;
     cout << "Files:" << endl;
     cout << "files" << endl;
     cout << endl;
     */
}

int main(int argc, const char* argv[])
{
    Configuration conf(argv[0]);
    conf.SetPrintUsage(PrintUsage);
    SetupConfiguration(conf);

    po::variables_map vm;
    try
    {
        vm = conf.Parse(argc, argv);
    }
#if BOOST_VERSION > 104000
    catch (po::multiple_occurrences &e)
    {
        cerr << "Program options invalid due to: " << e.what() << " of '" << e.get_option_name() << "'." << endl;
        return -1;
    }
#endif
    catch (exception& e)
    {
        cerr << "Program options invalid due to: " << e.what() << endl;
        return -1;
    }

    if (conf.HasVersion() || conf.HasPrint())
        return -1;

    if (conf.HasHelp())
    {
        PrintHelp();
        return -1;
    }

    Dim::Setup(conf.Get<string>("dns"));

    //try
    {
        // No console access at all
        if (!conf.Has("console"))
        {
            if (conf.Get<bool>("no-dim"))
                return RunDim<StateMachine, ConnectionFSC>(conf);
            else
                return RunDim<StateMachineDim, ConnectionDimFSC>(conf);
        }
        // Cosole access w/ and w/o Dim
        if (conf.Get<bool>("no-dim"))
        {
            if (conf.Get<int>("console")==0)
                return RunShell<LocalShell, StateMachine, ConnectionFSC>(conf);
            else
                return RunShell<LocalConsole, StateMachine, ConnectionFSC>(conf);
        }
        else
        {
            if (conf.Get<int>("console")==0)
                return RunShell<LocalShell, StateMachineDim, ConnectionDimFSC>(conf);
            else
                return RunShell<LocalConsole, StateMachineDim, ConnectionDimFSC>(conf);
        }
    }
    /*catch (std::exception& e)
    {
        cerr << "Exception: " << e.what() << endl;
        return -1;
    }*/

    return 0;
}