import QtQuick
import qs.config

Rectangle {
    id: root

    required property var entity
    property bool busy: false
    property int pendingBrightness: -1
    property string actionError: ""

    signal powerRequested
    signal brightnessRequested(int value)

    readonly property int confirmedBrightness: root.clamp(root.entity.brightnessPct ?? 0)
    readonly property int displayedBrightness: brightnessSlider.previewValue
    readonly property bool powerEnabled: root.entity.available && !root.busy
    readonly property bool dimmerEnabled: root.entity.available
        && root.entity.dimmable
        && !root.busy

    implicitHeight: 124
    radius: 14
    color: {
        if (root.entity.active)
            return Theme.alpha(Theme.warn, powerArea.containsMouse ? 0.145 : 0.095);
        return Theme.alpha(Theme.fg, powerArea.containsMouse ? 0.078 : 0.045);
    }
    border.width: 1
    border.color: {
        if (root.activeFocus)
            return Theme.alpha(Theme.accent, 0.72);
        if (root.entity.active)
            return Theme.alpha(Theme.warn, 0.17);
        return Theme.alpha(Theme.fg, 0.065);
    }
    activeFocusOnTab: root.powerEnabled

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

    Keys.onSpacePressed: {
        if (root.powerEnabled)
            root.powerRequested();
    }
    Keys.onReturnPressed: {
        if (root.powerEnabled)
            root.powerRequested();
    }

    Rectangle {
        id: bulb
        anchors.left: parent.left
        anchors.leftMargin: 13
        anchors.top: parent.top
        anchors.topMargin: 13
        width: 30
        height: 30
        radius: 10
        color: root.entity.active
            ? Theme.alpha(Theme.warn, 0.16)
            : Theme.alpha(Theme.fg, 0.065)

        Text {
            anchors.centerIn: parent
            text: root.busy ? "\u{F0772}" : "\u{F0335}"
            color: root.entity.active ? Theme.warn : Theme.fgDim
            font.family: Theme.fontMono
            font.pixelSize: 15
        }
    }

    Text {
        anchors.right: parent.right
        anchors.rightMargin: 13
        anchors.verticalCenter: bulb.verticalCenter
        text: root.entity.dimmable ? root.displayedBrightness + "%" : "—"
        color: root.entity.active || root.pendingBrightness >= 0
            ? Theme.warn
            : Theme.fgDim
        font.family: Theme.fontFamily
        font.pixelSize: Theme.fontSizeSmall
        font.weight: Font.DemiBold
        font.features: Theme.tabularFigures
    }

    Text {
        id: aliasLabel
        anchors.left: parent.left
        anchors.leftMargin: 13
        anchors.right: parent.right
        anchors.rightMargin: 13
        anchors.top: bulb.bottom
        anchors.topMargin: 8
        text: root.entity.name
        color: Theme.fg
        elide: Text.ElideRight
        font.family: Theme.fontFamily
        font.pixelSize: Theme.fontSize
        font.weight: Font.DemiBold
    }

    Text {
        anchors.left: aliasLabel.left
        anchors.right: aliasLabel.right
        anchors.top: aliasLabel.bottom
        anchors.topMargin: 2
        text: root.secondaryText()
        color: root.actionError !== ""
            ? Theme.warn
            : (root.entity.active ? Theme.warn : Theme.fgMuted)
        elide: Text.ElideRight
        font.family: Theme.fontFamily
        font.pixelSize: Theme.fontSizeSmall
    }

    MouseArea {
        id: powerArea
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.top: parent.top
        anchors.bottom: brightnessSlider.top
        anchors.bottomMargin: 1
        enabled: root.powerEnabled
        hoverEnabled: true
        cursorShape: enabled ? Qt.PointingHandCursor : Qt.ArrowCursor
        onPressed: root.forceActiveFocus()
        onClicked: root.powerRequested()
    }

    HomeBrightnessSlider {
        id: brightnessSlider
        anchors.left: parent.left
        anchors.leftMargin: 13
        anchors.right: parent.right
        anchors.rightMargin: 13
        anchors.bottom: parent.bottom
        anchors.bottomMargin: 5
        value: root.pendingBrightness >= 0
            ? root.pendingBrightness
            : root.confirmedBrightness
        enabled: root.dimmerEnabled
        accessibleName: root.entity.name + " brightness"
        onCommitted: value => root.brightnessRequested(value)
    }

    function clamp(candidate: real): int {
        return Math.max(0, Math.min(100, Math.round(candidate)));
    }

    function secondaryText(): string {
        if (root.actionError !== "")
            return root.errorText(root.actionError);
        if (!root.entity.available)
            return "Unavailable";
        if (root.busy && root.pendingBrightness >= 0)
            return "Setting " + root.pendingBrightness + "%";
        if (root.busy)
            return "Updating";
        return root.entity.active ? "On" : "Off";
    }

    function errorText(code: string): string {
        if (code === "authentication-required")
            return "Authentication required";
        if (code === "entity-not-discovered")
            return "Light is unavailable";
        return "Couldn’t update light";
    }
}