import Quickshell
import Quickshell.Wayland
import Quickshell.Bluetooth
import QtQuick
import qs.config
import qs.components
import qs.services

// The bluetooth menu: adapter power and the devices bluetoothd already knows
// about. Same full-screen layer surface as the launcher, so click-away and
// Escape work on any wlroots compositor.
//
// Deliberately not a pairing UI — discovery is never turned on, so nothing
// transient appears in the list and the panel stays a one-click connect.
PanelWindow {
    id: root

    required property var bar

    readonly property string screenName: root.bar.screen ? root.bar.screen.name : ""

    visible: Session.isOpen("bluetooth", root.screenName)

    screen: root.bar.screen
    WlrLayershell.layer: WlrLayer.Overlay
    WlrLayershell.namespace: Config.namespace + "-bluetooth"
    WlrLayershell.keyboardFocus: WlrKeyboardFocus.Exclusive

    anchors {
        left: true
        right: true
        top: true
        bottom: true
    }
    exclusionMode: ExclusionMode.Ignore
    color: "transparent"

    // ---- Data ------------------------------------------------------------

    readonly property BluetoothAdapter adapter: Bluetooth.defaultAdapter
    readonly property bool adapterOn: root.adapter ? root.adapter.enabled : false
    readonly property bool adapterBusy: root.adapter ? root.adapter.state === BluetoothAdapterState.Enabling || root.adapter.state === BluetoothAdapterState.Disabling : false

    // Known devices only: paired or bonded, i.e. what bluetoothd remembers.
    // Connected ones first, then alphabetical, so the list does not reshuffle
    // under the cursor for any other reason.
    readonly property var devices: {
        if (!root.adapter)
            return [];

        return [...root.adapter.devices.values].filter(d => d.paired || d.bonded).sort((a, b) => {
            if (a.connected !== b.connected)
                return a.connected ? -1 : 1;
            return (a.name || "").localeCompare(b.name || "");
        });
    }

    function toggleDevice(device: BluetoothDevice): void {
        if (!device)
            return;

        if (device.connected)
            device.disconnect();
        else
            device.connect();
    }

    onVisibleChanged: {
        if (root.visible) {
            list.currentIndex = 0;
            keyHandler.forceActiveFocus();
        }
    }

    // ---- Chrome ----------------------------------------------------------

    // Click-away scrim.
    MouseArea {
        anchors.fill: parent
        onClicked: Session.close()
    }

    Item {
        id: keyHandler

        anchors.fill: parent
        focus: true

        Keys.onEscapePressed: Session.close()
        Keys.onDownPressed: list.currentIndex = Math.min(list.currentIndex + 1, list.count - 1)
        Keys.onUpPressed: list.currentIndex = Math.max(list.currentIndex - 1, 0)
        Keys.onReturnPressed: root.toggleDevice(root.devices[list.currentIndex])
        Keys.onEnterPressed: root.toggleDevice(root.devices[list.currentIndex])
    }

    Rectangle {
        id: menu

        // Anchored to the panel's right edge, under the button that opens it.
        anchors {
            right: parent.right
            bottom: parent.bottom
            rightMargin: Theme.padding
            bottomMargin: Theme.barHeight + Theme.padding
        }

        readonly property int maxHeight: Math.min(Config.bluetoothMenuHeight, root.height - Theme.barHeight - Theme.padding * 2)
        readonly property int bodyHeight: root.adapterOn && list.count > 0 ? list.contentHeight : 48

        width: Math.min(Config.bluetoothMenuWidth, root.width - Theme.padding * 2)
        height: Math.min(menu.maxHeight, Theme.padding * 4 + header.height + Theme.padding * 2 + menu.bodyHeight)

        color: Theme.surface
        radius: Theme.radius * 2
        border.width: Theme.borderWidth
        border.color: Theme.border

        // Swallow clicks so they do not reach the scrim behind.
        MouseArea {
            anchors.fill: parent
        }

        Item {
            id: header

            anchors {
                left: parent.left
                right: parent.right
                top: parent.top
                margins: Theme.padding * 2
            }
            height: 24

            BluetoothGlyph {
                id: headerGlyph

                anchors.verticalCenter: parent.verticalCenter
                color: root.adapterOn ? Theme.text : Theme.textDim
                struck: !root.adapterOn
                size: 18
            }

            Text {
                anchors {
                    left: headerGlyph.right
                    right: toggle.left
                    leftMargin: Theme.padding
                    rightMargin: Theme.padding
                    verticalCenter: parent.verticalCenter
                }
                elide: Text.ElideRight
                text: "Bluetooth"
                color: Theme.text
                font.family: Theme.fontFamily
                font.pixelSize: Theme.fontSize
                font.bold: true
            }

            ToggleSwitch {
                id: toggle

                anchors {
                    right: parent.right
                    verticalCenter: parent.verticalCenter
                }
                checked: root.adapterOn
                busy: root.adapterBusy
                enabled: root.adapter !== null

                // BlueZ reports the new state back, so `checked` stays bound to
                // it rather than to what was clicked.
                onToggled: on => {
                    if (root.adapter)
                        root.adapter.enabled = on;
                }
            }
        }

        Rectangle {
            id: separator

            anchors {
                left: parent.left
                right: parent.right
                top: header.bottom
                topMargin: Theme.padding * 2
            }
            height: Theme.borderWidth
            color: Theme.border
        }

        ListView {
            id: list

            anchors {
                left: parent.left
                right: parent.right
                top: separator.bottom
                bottom: parent.bottom
                margins: Theme.padding
                topMargin: Theme.padding
            }
            visible: root.adapterOn
            clip: true
            spacing: 1
            boundsBehavior: Flickable.StopAtBounds
            keyNavigationEnabled: false
            model: root.devices

            delegate: BluetoothDeviceEntry {
                required property var modelData
                required property int index

                device: modelData
                width: list.width
                selected: list.currentIndex === index

                onActivated: root.toggleDevice(modelData)
                onEntered: list.currentIndex = index
            }
        }

        Text {
            anchors {
                left: parent.left
                right: parent.right
                top: separator.bottom
                bottom: parent.bottom
                margins: Theme.padding * 2
            }
            visible: !root.adapterOn || list.count === 0
            horizontalAlignment: Text.AlignHCenter
            verticalAlignment: Text.AlignVCenter
            wrapMode: Text.WordWrap
            text: !root.adapter ? "No bluetooth adapter" : !root.adapterOn ? "Bluetooth is off" : "No paired devices"
            color: Theme.textDim
            font.family: Theme.fontFamily
            font.pixelSize: Theme.fontSize
        }
    }
}