mathtrainingstuff/qml/calender/Calender.qml

import QtQuick 2.11
import QtQuick.Controls 2.4
import "./"

Item {
    id: calender

    property string nextDate: "31.12.1799"
    property string lastDate: "30.12.1799"
    property int actualDateCount: 0
    property int min: 1800
    property int max: 2199
    property int tickInterval: 10000
    property int dateCount: 10
    property int correct: 0
    property int wrong: 0
    property int weekDay: 1
    property bool runningPageState: true

    signal pageOpened()

    onPageOpened: {
        calender.start()
    }

    states: [
        State {
            name: "starting"
            PropertyChanges {
                target: calenderStack
                currPage: calenderStartPageComp
            }
        },

        State {
            name: "running"
            PropertyChanges {
                target: calenderStack
                currPage: calenderRunningPageComp
            }
        },
        State {
            name: "gameOver"
            PropertyChanges {
                target: calenderStack
                currPage: calenderGameOverPageComp
            }
        }
    ]

    StackView {
        id: calenderStack

        property var currPage;

        anchors.fill: parent

        onCurrPageChanged: {
            calenderStack.replace(currPage)
        }
        onCurrentItemChanged: {
            calenderStack.currentItem.pageOpened()
        }

        Component {
            id: calenderStartPageComp
            CalenderStartPage {
            }
        }

        Component {
            id: calenderRunningPageComp
            CalenderRunningPage {
            }
        }

        Component {
            id: calenderGameOverPageComp
            CalenderGameOverPage {
            }
        }


        replaceExit: Transition {
            NumberAnimation {
                from: 1
                to: 0
                property: "opacity"
                duration: 200
                easing.type: Easing.InOutQuad
            }
        }

        replaceEnter: Transition {
            NumberAnimation {
                from: 0
                to: 1
                property: "opacity"
                duration: 200
                easing.type: Easing.InOutQuad
            }
        }
    }


    /*-------------------------
    ---------functions---------
    -------------------------*/

    function start() {
        calender.reset()
        calender.state = "starting"
    }

    function run() {
        calender.generateNextDate()
        calender.state = "running"
    }

    function gameOver() {
        calender.state = "gameOver"
    }

    function reset() {
        calender.actualDateCount = 0
        calender.lastDate = 0
        calender.nextDate = 0
        calender.correct = 0
        calender.wrong = 0
    }

    function generateNextDate() {
        var daysPerMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        var monthCodes = [6, 2, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4]
        var yearCode = 0
        var randDate = calender.nextDate
        var randDay = 31
        var randMonth = 12
        var randYear = 1799
        var range = calender.max - calender.min
        var century = 17
        var weekDay = 1
        calender.lastDate = calender.nextDate
        while (randDate === calender.lastDate) {
            //console.log("entered mainwhile " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            randYear = Math.floor((Math.random()*(range+1))+calender.min)
            //console.log("generated year " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            century = Math.floor(randYear/100)
            //console.log("calculated century " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            yearCode = (randYear - century * 100) + Math.floor((randYear - century * 100)/4)
            //console.log("generated yearCode " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            while (century > 21) {
                century -= 4
                //console.log("down count century " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            }
            switch (century) {
                case 18:
                    yearCode += 3
                    break
                case 19:
                    yearCode += 1
                    break
                case 21:
                    yearCode += 5
                    break
                default:
                    //console.log("added century specified value to yearCode " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            }
            randMonth = Math.floor((Math.random()*(12))+1)
            //console.log("generated month " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            if (randYear % 4 === 0 && randMonth <= 2) {
                yearCode += 6
                //console.log("if leap-year " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            }
            while (yearCode >= 7) {
                yearCode -= 7
                //console.log("down count yearCode " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            }
            randDay = Math.floor((Math.random()*(daysPerMonth[randMonth-1]))+1)
            //console.log("generated Day " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
            randDate = String(randDay) + "." + String(randMonth) + "." + String(randYear)
            //console.log("generated randDate " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
        }
        weekDay = (yearCode + monthCodes[randMonth-1] + randDay) // - 7*Math.floor((yearCode + monthCodes[randMonth-1] + randDay)/7)
        //console.log("generated weekday " + "yearCode: " + yearCode + " randDate: " + randDate + " randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + " century: " + century + " weekDay: " + weekDay)
        //weekDay -= 7*Math.floor(weekDay/7)
        while (weekDay >= 7) {
            weekDay -= 7
            //console.log("down count weekday " + "yearCode: " + yearCode + " randDate: " + randDate + /*" randDay: " + randDay + " randMonth: " + randMonth + " randYear: " + randYear + " Range: " + range + */ " century: " + century + " weekDay: " + weekDay)
        }
        console.log("randDate: " + randDate + " yearCode: " + yearCode +  " century: " + century + " weekDay: " + weekDay)
        calender.weekDay = weekDay
        calender.nextDate = randDate
        calender.actualDateCount += 1
    }
}