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Qt World Summit Conference App

 import Felgo 4.0
 import QtQuick 2.0

 QtObject {
   id: _

   // qtws 2019 api urls
   property string location: "Berlin"

   property string qtwsApiScheduleUrl: Qt.resolvedUrl("https://www.qtworldsummit.com/2019/api/schedule/all/?location=" + _.location)
   readonly property string qtwsApiSpeakersUrl: Qt.resolvedUrl("https://www.qtworldsummit.com/2019/api/speakers/all/")
   readonly property string qtwsApiVersionUrl: Qt.resolvedUrl("https://www.qtworldsummit.com/2019/api/version/show/")

   // fallback urls of locally stored version in assets
   readonly property string fallbackScheduleUrl: Qt.resolvedUrl("../../assets/data/schedule.json")
   readonly property string fallbackSpeakersUrl: Qt.resolvedUrl("../../assets/data/speakers.json")
   readonly property string fallbackVersionUrl: Qt.resolvedUrl("../../assets/data/version.json")

   Component.onCompleted: {
     HttpNetworkActivityIndicator.activationDelay = 0
   }

   // sendGetRequest - load data from url with success handler
   function sendGetRequest(url, successHandler, errorHandler) {
     HttpRequest.get(url)
     .then(function(res) {
       var fixedResponse = res.text.replace(new RegExp("&",'g'),"&")
       successHandler(JSON.parse(fixedResponse))
     })
     .catch(function(err) {
       console.error("Error: Failed to load data from "+url+", error = "+err.message)
       if(errorHandler !== undefined)
         errorHandler()
       else if(!loading)
         dataModel.loadingFailed()
     })
   }

   // checkAPIVersion - checks Qt WS API version and updates data if necessary
   function checkAPIVersion(useLocalData) {
     var versionUrl = useLocalData ? _.fallbackVersionUrl : _.qtwsApiVersionUrl

     _.sendGetRequest(versionUrl, function(data) {
       var currVersion = data.version

       // load new data when debug build, first call, or newer version available
       if(!system.publishBuild || dataModel.version === undefined || dataModel.version !== currVersion) {
         dataModel.version = currVersion
         _.loadSchedule(useLocalData) // also loads speakers
       }
     }, function() {
       // custom error handler
       if(dataModel.version === undefined && useLocalData === undefined)
         checkAPIVersion(true)
       else if(!loading)
         dataModel.loadingFailed()
     })
   }

   // loadSchedule - load Qt WS schedule from api
   function loadSchedule(useLocalData) {
     var scheduleUrl = useLocalData ? _.fallbackScheduleUrl : _.qtwsApiScheduleUrl

     _.sendGetRequest(scheduleUrl, function(data) {
       _.processScheduleData(data)
       // load speakers after schedule is processed
       _.loadSpeakers(useLocalData)
     })
   }

   // loadSpeakers - load Qt WS speakers from api
   function loadSpeakers(useLocalData) {
     var speakersUrl = useLocalData ? _.fallbackSpeakersUrl : _.qtwsApiSpeakersUrl

     _.sendGetRequest(speakersUrl, function(data) {
       _.processSpeakersData(data)

       // when schedule and speakers are loaded, all loading is done -> cache current API version
       storage.setValue("version", dataModel.version)
     })
   }

   // processScheduleData - process schedule data for usage in UI
   function processScheduleData(data) {
     // retrieve tracks and talks and build model for tracks, talks and schedule
     var tracks = {}
     var talks = {}
     for(var day in data.conference.days) {
       for(var room in data.conference.days[day]["rooms"])
         for (var eventIdx in data.conference.days[day]["rooms"][room]) {
           var event = data.conference.days[day]["rooms"][room][eventIdx]

           // calculate event end time
           var start = event.start.split(":")
           var duration = event.duration.split(":")
           var end = [parseInt(start[0])+parseInt(duration[0]),
                      parseInt(start[1])+parseInt(duration[1])]
           if(end[1] >= 60) {
             end[1] -= 60
             end[0] += 1
           }

           // format start and end time
           event.start = _.format2DigitTime(start[0]) + ":" + _.format2DigitTime(start[1])
           event.end = _.format2DigitTime(end[0]) + ":" + _.format2DigitTime(end[1])

           // clean-up false start time formatting (always 2 digits required)
           if(event.start.substring(1,2) == ':') {
             event.start = "0"+event.start
           }

           // add day of event (for favorites)
           event.day = day

           // build tracks model
           if(event["tracks"] !== undefined && Array.isArray(event["tracks"])) {
             for(var idx in event["tracks"]) {
               tracks[event["tracks"][idx].name] = event["tracks"][idx].color
             }
           }

           // clean up incorrect room entries of API version 1.953
           if(event["room"] == "Berlin" || event["room"] == ":")
             event["room"] = ""

           // build talks model
           talks[event["id"]] = event

           // replace talks in schedule with talk-id
           data.conference.days[day]["rooms"][room][eventIdx] = event["id"]
         }
     }

     //  define track colors
 //    var hueDiff = 1 / Object.keys(tracks).length
 //    var i = 0
 //    for(var track in tracks) {
 //      tracks[track] = i * hueDiff
 //      i++
 //    }

     // store data
     dataModel.talks = talks
     dataModel.tracks = tracks
     dataModel.schedule = data
     storage.setValue("talks", talks)
     storage.setValue("tracks", tracks)
     storage.setValue("schedule", data)
     dataModel.preparedTracks = viewHelper.prepareTracks(tracks)

     // force update of favorites as new data arrived
     var favorites = dataModel.favorites
     dataModel.favorites = undefined
     dataModel.favorites = favorites
   }

   // processSpeakersData - process schedule data for usage in UI
   function processSpeakersData(data) {
     // convert speaker data into model map with id as key
     var speakers = {}
     for(var i = 0; i < data.length; i++) {
       var speaker = data[i]
       speakers[speaker.id] = speaker

       var talks= []
       for (var j in Object.keys(dataModel.talks)) {
         var talkID = Object.keys(dataModel.talks)[j];
         var talk = dataModel.talks[parseInt(talkID)]
         var persons = talk.persons

         for(var k in persons) {
           if(persons[k].id === speaker.id) {
             talks.push(talkID.toString())
           }
         }
       }
       speakers[speaker.id]["talks"] = talks
     }
     // store data
     dataModel.speakers = speakers
     dataModel.preparedSpeakers = viewHelper.prepareSpeakers(speakers)
     storage.setValue("speakers", speakers)
   }

   // format2DigitTime - adds leading zero to time (hour, minute) if required
   function format2DigitTime(time) {