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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2016                                                               *
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#include <modules/newhorizons/util/hongkangparser.h>

#include <modules/newhorizons/util/imagesequencer.h>
#include <modules/newhorizons/util/instrumentdecoder.h>

#include <openspace/util/time.h>
#include <openspace/util/spicemanager.h>

#include <ghoul/logging/logmanager.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/filesystem/directory.h>

#include <fstream>
#include <iterator>
#include <iomanip>
#include <limits>


namespace {
    const std::string _loggerCat = "HongKangParser";
    const std::string keyTranslation = "DataInputTranslation";

    const std::string PlaybookIdentifierName = "HongKang";
}

namespace openspace {
HongKangParser::HongKangParser(std::string name, std::string fileName,
                               std::string spacecraft,
                               ghoul::Dictionary translationDictionary,
                               std::vector<std::string> potentialTargets)
    : _name(std::move(name))
    , _defaultCaptureImage(absPath("${OPENSPACE_DATA}/scene/common/textures/placeholder.png"))
    , _fileName(std::move(fileName))
    , _spacecraft(std::move(spacecraft))
    , _potentialTargets(std::move(potentialTargets))
{
    //get the different instrument types
    const std::vector<std::string>& decoders = translationDictionary.keys();
    //for each decoder (assuming might have more if hong makes changes)
    for (int i = 0; i < decoders.size(); ++i) {
        //create dictionary containing all {playbookKeys , spice IDs}
        if (decoders[i] == "Instrument") {
            ghoul::Dictionary typeDictionary;
            translationDictionary.getValue(decoders[i], typeDictionary);
            //for each playbook call -> create a Decoder object
            const std::vector<std::string>& keys = typeDictionary.keys();
            //std::string abort = decoders[i] + "." + keyStopCommand;
            for (int j = 0; j < keys.size(); ++j) {
                std::string currentKey = decoders[i] + "." + keys[j];
                
                ghoul::Dictionary decoderDictionary;
                translationDictionary.getValue(currentKey, decoderDictionary);

                Decoder* decoder = Decoder::createFromDictionary(decoderDictionary, decoders[i]);
                //insert decoder to map - this will be used in the parser to determine
                //behavioral characteristics of each instrument
                _fileTranslation[keys[j]] = decoder;
            }
        }
        //Hong's playbook needs _only_ instrument translation though.
    }
}

void HongKangParser::findPlaybookSpecifiedTarget(std::string line, std::string& target) {
    //remembto add this lua later... 
    std::transform(line.begin(), line.end(), line.begin(), toupper);
    std::vector<std::string> ptarg = _potentialTargets;
    for (const auto& p : ptarg) {
        // loop over all targets and determine from 4th col which target this instrument points to
        if (line.find(p) != std::string::npos){
            target = p;
            break;
        }
        else {
        // not found - we set void until we have more info. 
            target = "VOID";
        }
    }
}

bool HongKangParser::create() {
    //check input for errors. 
    bool hasObserver = SpiceManager::ref().hasNaifId(_spacecraft);
    if (!hasObserver){
        LERROR("SPICE navigation system has no pooled observer: '" << _spacecraft << "' in kernel" <<
               "Please check that all necessary kernels are loaded"<<
               "along with correct modfile definition.");
        return hasObserver;
    }
    if (_potentialTargets.size() == 0){
        LERROR("In order to find targeting from event file user has to provide list of potential targets "
               << "please check modfile");
    }

    if (size_t position = _fileName.find_last_of(".") + 1){
        if (position != std::string::npos){
            std::string extension = ghoul::filesystem::File(_fileName).fileExtension();

            if (extension == "txt") {// Hong Kang. pre-parsed playbook
                LINFO("Using Preparsed Playbook V9H");
                std::ifstream file(_fileName , std::ios::binary);
                if (!file.good()){
                    LERROR("Failed to open event file '" << _fileName << "'");
                    return false;
                }

                std::string line = "";
                double shutter = 0.01;

                std::string previousTarget;

                std::string previousCamera;

                TimeRange cameraRange;
                TimeRange scanRange;

                std::vector<std::string> scannerSpiceID;
                std::vector<std::string> cameraSpiceID;

                double capture_start = -1;
                double capture_stop = -1;
                double scan_start = -1;
                double scan_stop = -1;

                std::string cameraTarget  = "VOID";
                std::string scannerTarget = "VOID";

                while (!file.eof()){
                    std::getline(file, line);
                    
                    std::string event = line.substr(0, line.find_first_of(" ")); 

                    auto it = _fileTranslation.find(event);
                    bool foundEvent = (it != _fileTranslation.end());

                    std::string met = line.substr(25, 9);
                    double time = getETfromMet(met);

                    if (foundEvent){
                        //store the time, this is used for getNextCaptureTime() 
                        _captureProgression.push_back(time);
                        
                        if (it->second->getDecoderType() == "CAMERA"){
                            if (capture_start == -1){
                                //encountered new camera sequence- store start time
                                capture_start = time;
                                previousCamera = it->first;
                            }
                            //always store individual image for camera
                            cameraSpiceID = it->second->getTranslation();
                            //rely on playboook mdl column to determine target
                            findPlaybookSpecifiedTarget(line, cameraTarget);

                            //fill image

                            Image image;
                            image.startTime = time;
                            image.stopTime = time + shutter;
                            image.path = _defaultCaptureImage;
                            image.activeInstruments = cameraSpiceID;
                            image.target = cameraTarget;
                            image.isPlaceholder = true;
                            image.projected = false;
                            //createImage(image, time, time + shutter, cameraSpiceID, cameraTarget, _defaultCaptureImage);

                            //IFF spaccraft has decided to switch target, store in target map (used for: 'next observation focus')
                            if (previousTarget != image.target){
                                previousTarget = image.target;
                                std::pair<double, std::string> v_target = std::make_pair(time, image.target);
                                _targetTimes.push_back(v_target);
                            }

                            //store actual image in map. All targets get _only_ their corresp. subset.
                            _subsetMap[image.target]._subset.push_back(image);
                            //compute and store the range for each subset 
                            _subsetMap[image.target]._range.setRange(time);
                        }
                        if (it->second->getDecoderType() == "SCANNER"){ // SCANNER START 
                            scan_start = time;

                            InstrumentDecoder* scanner = static_cast<InstrumentDecoder*>(it->second);
                            std::string endNominal = scanner->getStopCommand();

                            // store current position in file
                            std::streampos len = file.tellg();
                            std::string linePeek;
                            bool foundstop = false;
                            while (!file.eof() && !foundstop){
                                //continue grabbing next line until we find what we need
                                getline(file, linePeek);
                                if (linePeek.find(endNominal) != std::string::npos){
                                    foundstop = true;

                                    met = linePeek.substr(25, 9);
                                    scan_stop = getETfromMet(met);
                                    findPlaybookSpecifiedTarget(line, scannerTarget);
                                    scannerSpiceID = it->second->getTranslation();

                                    scanRange._min = scan_start;
                                    scanRange._max = scan_stop;
                                    _instrumentTimes.push_back(std::make_pair(it->first, scanRange));

                                    //store individual image
                                    Image image;
                                    image.startTime = scan_start;
                                    image.stopTime = scan_stop;
                                    image.path = _defaultCaptureImage;
                                    image.activeInstruments = scannerSpiceID;
                                    image.target = cameraTarget;
                                    image.isPlaceholder = true;
                                    image.projected = false;

                                    _subsetMap[scannerTarget]._subset.push_back(image);
                                    _subsetMap[scannerTarget]._range.setRange(scan_start);
                                }
                            }
                            //go back to stored position in file
                            file.seekg(len, std::ios_base::beg);
                        }
                    }
                    else{ // we have reached the end of a scan or consecutive capture sequence!
                        if (capture_start != -1){
                            //end of capture sequence for camera, store end time of this sequence
                            capture_stop = time;
                            cameraRange._min = capture_start;
                            cameraRange._max = capture_stop;
                            _instrumentTimes.push_back(std::make_pair(previousCamera, cameraRange));

                            capture_start = -1;
                        }
                    }
                }
            }
        }
    }


    sendPlaybookInformation(PlaybookIdentifierName);
    return true;
}

bool HongKangParser::augmentWithSpice(Image& image,
                                      std::string spacecraft, 
                                      std::vector<std::string> payload, 
                                      std::vector<std::string> potentialTargets)
{
    image.target = "VOID";
    // we have (?) to cast to int, unfortunately
    // Why? --abock
    // because: old comment --m
    int exposureTime = image.stopTime - image.startTime;
    if (exposureTime == 0) {
        exposureTime = 1;
    }

    for (int i = 0; i < potentialTargets.size(); ++i) {
        bool _withinFOV = false;
        for (int j = 0; j < image.activeInstruments.size(); ++j) {
            double time = image.startTime;
            for (int k = 0; k < exposureTime; k++){
                time += k;
                _withinFOV = SpiceManager::ref().isTargetInFieldOfView(
                    potentialTargets[i],
                    spacecraft,
                    image.activeInstruments[j],
                    SpiceManager::FieldOfViewMethod::Ellipsoid,
                    {},
                    time
                );

                if (_withinFOV) {
                    image.target = potentialTargets[i];
                    _withinFOV = false;
                }
            }
        }
    }
    return false;
}

//Image HongKangParser::createImage(double startTime, double stopTime, std::vector<std::string> instr, std::string targ, std::string path) {
//    image.startTime = startTime;
//    image.stopTime = stopTime;
//    image.path = path;
//    for (int i = 0; i < instr.size(); i++){
//        image.activeInstruments.push_back(instr[i]);
//    }
//    image.target = targ;
//    image.projected = false;
//    image.isPlaceholder = true;
//}

double HongKangParser::getETfromMet(std::string line){
    std::string::size_type sz;
    return getETfromMet(std::stod(line, &sz));
}

double HongKangParser::getETfromMet(double met){
    double diff;
    double referenceET =
        SpiceManager::ref().ephemerisTimeFromDate("2015-07-14T11:50:00.00");
    double et = referenceET;

    //_metRef += 3; // MET reference time is off by 3 sec? 

    diff = std::abs(met - _metRef);
    if (met > _metRef){
        et = referenceET + diff;
    } else if (met < _metRef){
        et = referenceET - diff;
    }
    return et;
}


double HongKangParser::getMetFromET(double et){
    double met;
    double referenceET =
        SpiceManager::ref().ephemerisTimeFromDate("2015-07-14T11:50:00.00");

    if (et >= referenceET){
        met = _metRef + (et - referenceET);
    }else{
        met = _metRef - (referenceET - et);
    }

    return met;
}


}