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import QtQuick 2.15
import QtQuick.Layouts 1.15
import QtQuick.Controls 2.15

import org.kde.plasma.plasmoid 2.0
import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.components 2.0 as PlasmaComponents
import org.kde.plasma.components 3.0 as PlasmaComponents3
import org.kde.plasma.extras 2.0 as PlasmaExtras

RowLayout {
    id: activityView
    width: (type == "announcement" ? announcementsListView : assignmentsListView).width
    Layout.fillWidth: true

    function sameDay(due, now) {
        return (
            due.getFullYear() == now.getFullYear() &&
            due.getMonth() == now.getMonth() &&
            due.getDate() == now.getDate()
        )
    }

    function dayDiff(due, now, stopAt) {
        // due and now are both Date objects
        // if due has the same day as now (i.e. due is today), return 0
        // if due is tomorrow, return 1, the day after that 2, yesterday -1, etc.
        // when the absolute value of diff reaches stopAt, return stopAt
        let diff = 0
        const step = (due > now) ? 1 : -1
        while (!sameDay(due, now)) {
            now.setDate(now.getDate() + step)
            diff += step
            if (Math.abs(diff) >= stopAt) {
                return stopAt
            }
        }
        return diff
    }

    function humanDue(isoDue) {
        // converts ISO 8601 datetime string to relative time, e.g. tomorrow midnight
        const daysOfWeek = [
            i18n("Sunday"),
            i18n("Monday"),
            i18n("Tuesday"),
            i18n("Wednesday"),
            i18n("Thursday"),
            i18n("Friday"),
            i18n("Saturday"),
        ]

        try {
            let due = new Date(isoDue)
            if (due.toString() == "Invalid Date") {
                console.warn(`Cannot parse due date: ${isoDue}`)
                return isoDue
            }

            let now = new Date()
            const pastDue = (due <= now)
            const dayDifference = dayDiff(due, now, 8)
            let humanDueString = ""

            if (dayDifference <= -2) {
                humanDueString = Qt.formatDate(due)
            } else if (dayDifference == -1) {
                humanDueString = i18n("Yesterday")
            } else if (dayDifference == 0) {
                humanDueString = i18n("Today")
            } else if (dayDifference == 1) {
                humanDueString = i18n("Tomorrow")
            } else if (dayDifference <= 6) {
                humanDueString = daysOfWeek[due.getDay()]
            } else {
                humanDueString = Qt.formatDate(due)
            }

            humanDueString += " " + Qt.formatTime(due)
            return humanDueString
        } catch (e) {
            return isoDue // screw it
        }
    }

    function dueLabelText() {
        if (type != "assignment") { return "" }
        if (submitted) { return i18n("Submitted") }
        return i18n("Due: ") + humanDue(dueAt)
    }

    RowLayout {
        Layout.fillWidth: true
        PlasmaComponents3.CheckBox {
            id: activityCheckbox
            onToggled: () => {
                activityLabel.font.strikeout = (checkState == Qt.Checked)
            }
        }

        ColumnLayout {
            PlasmaComponents3.Label {
                id: activityLabel
                text: `[${course}] ${title}`
                font.bold: important
                color: important ? PlasmaCore.Theme.negativeTextColor : PlasmaCore.Theme.textColor
                elide: Text.ElideRight
                Layout.fillWidth: true
            }

            PlasmaComponents3.Label {
                id: dueLabel
                visible: type == "assignment"
                text: dueLabelText()
                color: activityLabel.color
                Layout.fillWidth: true
            }

            MouseArea {
                anchors.fill: parent
                onClicked: () => {
                    activityCheckbox.toggle()  // toggle checkbox
                    activityCheckbox.toggled() // and trigger the onToggled effects
                }
            }
        }

    }

    RowLayout {
        Layout.alignment: Qt.AlignRight

        PlasmaComponents3.ToolButton {
            icon.name: "view-visible"
            onClicked: () => {
                Qt.openUrlExternally(url)
            }
        }

        PlasmaComponents3.ToolButton {
            icon.name: "emblem-important-symbolic"
            checked: important

            onClicked: () => {
                important = !important
                activityLabel.font.bold = important
                activityLabel.color = important ? PlasmaCore.Theme.negativeTextColor : PlasmaCore.Theme.textColor

                const configKeys = {
                    announcement: "importantAnnouncements",
                    assignment: "importantAssignments",
                }

                let importantActivities = plasmoid.configuration[configKeys[type]]
                if (important) {
                    if (!importantActivities.includes(activityId)) {
                        importantActivities.push(activityId)
                    }
                } else {
                    // remove activityId from list
                    importantActivities.splice(importantActivities.indexOf(activityId), 1)
                }
                // save config
                plasmoid.configuration[configKeys[type]] = importantActivities
            }
        }
    }
}