#include <iostream>
#include <pv/clientFactory.h>
#include <pv/pvAccess.h>

#include <stdio.h>
#include <epicsStdlib.h>
#include <epicsGetopt.h>
#include <epicsThread.h>
#include <pv/logger.h>
#include <pv/lock.h>

#include <vector>
#include <string>
#include <sstream>

#include <pv/event.h>
#include <epicsExit.h>

#include "pvutils.cpp"

using namespace std;
using namespace std::tr1;
using namespace epics::pvData;
using namespace epics::pvAccess;


#define DEFAULT_TIMEOUT 3.0

double timeOut = DEFAULT_TIMEOUT;

void usage (void)
{
    fprintf (stderr, "\nUsage: pvinfo [options] <PV name>...\n\n"
    "  -h: Help: Print this message\n"
    "options:\n"
    "  -w <sec>:          Wait time, specifies timeout, default is %f second(s)\n"
    "  -d:                Enable debug output\n"
    "  -c:                Wait for clean shutdown and report used instance count (for expert users)"
    "\nExample: pvinfo double01\n\n"
             , DEFAULT_TIMEOUT);
}


/*+**************************************************************************
 *
 * Function:	main
 *
 * Description:	pvinfo main()
 * 		Evaluate command line options, set up PVA, connect the
 * 		channels, print the data as requested
 *
 * Arg(s) In:	[options] <pv-name>...
 *
 * Arg(s) Out:	none
 *
 * Return(s):	Standard return code (0=success, 1=error)
 *
 **************************************************************************-*/

int main (int argc, char *argv[])
{
    int opt;                    /* getopt() current option */
    bool debug = false;
    bool cleanupAndReport = false;

    setvbuf(stdout,NULL,_IOLBF,BUFSIZ);    /* Set stdout to line buffering */

    while ((opt = getopt(argc, argv, ":hw:dc")) != -1) {
        switch (opt) {
        case 'h':               /* Print usage */
            usage();
            return 0;
        case 'w':               /* Set PVA timeout value */
            if(epicsScanDouble(optarg, &timeOut) != 1 || timeOut <= 0.0)
            {
                fprintf(stderr, "'%s' is not a valid timeout value "
                        "- ignored. ('pvget -h' for help.)\n", optarg);
                timeOut = DEFAULT_TIMEOUT;
            }
            break;
        case 'd':               /* Debug log level */
            debug = true;
            break;
        case 'c':               /* Clean-up and report used instance count */
            cleanupAndReport = true;
            break;
        case '?':
            fprintf(stderr,
                    "Unrecognized option: '-%c'. ('pvinfo -h' for help.)\n",
                    optopt);
            return 1;
        case ':':
            fprintf(stderr,
                    "Option '-%c' requires an argument. ('pvinfo -h' for help.)\n",
                    optopt);
            return 1;
        default :
            usage();
            return 1;
        }
    }

    int nPvs = argc - optind;       /* Remaining arg list are PV names */
    if (nPvs < 1)
    {
        fprintf(stderr, "No pv name(s) specified. ('pvinfo -h' for help.)\n");
        return 1;
    }

    vector<string> pvs;     /* Array of PV names */
    for (int n = 0; optind < argc; n++, optind++)
        pvs.push_back(argv[optind]);       /* Copy PV names from command line */


    SET_LOG_LEVEL(debug ? logLevelDebug : logLevelError);

    std::cout << std::boolalpha;

    bool allOK = true;

    {
        Requester::shared_pointer requester(new RequesterImpl("pvinfo"));
    
        ClientFactory::start();
        ChannelProvider::shared_pointer provider = getChannelAccess()->getProvider("pva");
    
        // first connect to all, this allows resource (e.g. TCP connection) sharing
        vector<Channel::shared_pointer> channels(nPvs);
        for (int n = 0; n < nPvs; n++)
        {
            shared_ptr<ChannelRequesterImpl> channelRequesterImpl(new ChannelRequesterImpl()); 
            channels[n] = provider->createChannel(pvs[n], channelRequesterImpl);
        }
        
        // for now a simple iterating sync implementation, guarantees order
        for (int n = 0; n < nPvs; n++)
        {
            Channel::shared_pointer channel = channels[n];
            shared_ptr<ChannelRequesterImpl> channelRequesterImpl = dynamic_pointer_cast<ChannelRequesterImpl>(channel->getChannelRequester());
             
            if (channelRequesterImpl->waitUntilConnected(timeOut))
            {
                shared_ptr<GetFieldRequesterImpl> getFieldRequesterImpl(new GetFieldRequesterImpl(channel));
                channel->getField(getFieldRequesterImpl, "");

                if (getFieldRequesterImpl->waitUntilFieldGet(timeOut))
            	{
                    Structure::const_shared_pointer structure =
                            dynamic_pointer_cast<const Structure>(getFieldRequesterImpl->getField());

                    channel->printInfo();
                    if (structure)
                    {
                        String s;
                        structure->toString(&s);
                        std::cout << s << std::endl << std::endl;
                    }
                    else
                    {
                        std::cout << "(null introspection data)" << std::endl << std::endl;
                    }
            	}
            	else
            	{
            		allOK = false;
                    channel->destroy();
                    std::cerr << "[" << channel->getChannelName() << "] failed to get channel introspection data" << std::endl;
            	}
            }
            else
            {
                allOK = false;
                channel->destroy();
                std::cerr << "[" << channel->getChannelName() << "] connection timeout" << std::endl;
            }
        }    

        ClientFactory::stop();
    }

    if (cleanupAndReport)
    {
        // TODO implement wait on context
        epicsThreadSleep ( 3.0 );
        //std::cout << "-----------------------------------------------------------------------" << std::endl;
        //epicsExitCallAtExits();
    }

    return allOK ? 0 : 1;
}