// One tile in the power menu: big glyph, label underneath.
//
// Anything that ends the session arms on the first press and only fires on the
// second — an accidental Ctrl+Alt+Delete should never be one click away from
// losing everything that is open.
//
// Armed, the tile turns red and names the thing it is about to do ("Power off")
// rather than saying "Confirm". Six tiles could all say "Confirm"; only one of
// them is about to take the machine down, and the press that does it should say
// which one it is.

import QtQuick
import qs.config

Rectangle {
    id: root

    property string glyph: ""
    property string label: ""
    // Tint red on hover and require the two-step confirm.
    property bool destructive: false
    // Highlighted by keyboard navigation.
    property bool selected: false

    signal activated

    readonly property bool armed: confirmTimer.running

    // The tile's own label, said as a sentence rather than as a title: "Power
    // Off" is the name of a menu entry, "Power off" is the thing the next press
    // does. Derived, so an entry added to the menu cannot forget to name itself.
    readonly property string armedLabel: root.label === ""
        ? "Confirm"
        : root.label.charAt(0) + root.label.slice(1).toLowerCase()

    implicitWidth: 136
    implicitHeight: 136
    radius: Theme.cardRadius + 6
    border.width: 0

    readonly property color accentFor: root.destructive ? Theme.danger : Theme.accent

    color: {
        if (root.armed)
            return Theme.alpha(Theme.danger, 0.32);
        if (mouse.pressed)
            return Theme.alpha(root.accentFor, 0.3);
        if (mouse.containsMouse || root.selected)
            return Theme.alpha(root.accentFor, 0.18);
        return Theme.alpha(Theme.fg, 0.07);
    }

    Behavior on color {
        ColorAnimation {
            duration: Theme.durFast
        }
    }

    // Keyboard focus ring.
    Rectangle {
        anchors.fill: parent
        radius: parent.radius
        color: "transparent"
        border.width: root.selected ? 2 : 0
        border.color: root.accentFor
        visible: root.selected
    }

    Column {
        anchors.centerIn: parent
        spacing: 10

        Text {
            anchors.horizontalCenter: parent.horizontalCenter
            text: root.glyph
            color: root.armed ? Theme.danger : Theme.fg
            font.family: Theme.fontMono
            font.pixelSize: 40
        }

        Text {
            anchors.horizontalCenter: parent.horizontalCenter
            text: root.armed ? root.armedLabel : root.label
            color: root.armed ? Theme.danger : Theme.fg
            font.family: Theme.fontFamily
            font.pixelSize: Theme.fontSize
            font.weight: Font.Medium
        }
    }

    // Trigger from a click or from Enter while keyboard-selected.
    function trigger(): void {
        if (root.destructive && !root.armed) {
            confirmTimer.restart();
            return;
        }
        confirmTimer.stop();
        root.activated();
    }

    function disarm(): void {
        confirmTimer.stop();
    }

    // Arming is not sticky: walk away and the button forgets.
    Timer {
        id: confirmTimer
        interval: 4000
    }

    MouseArea {
        id: mouse
        anchors.fill: parent
        hoverEnabled: true
        cursorShape: Qt.PointingHandCursor
        onClicked: root.trigger()
    }
}