// The top bar: edge-to-edge system chrome with no surface of its own. Content
// floats directly over the desktop, while individual controls still provide
// hover and press feedback. The entire bar is a hit target so the top-left
// corner remains a dependable workspace-scroll gesture.
//
// Instantiate one per screen:
//
//   Variants {
//       model: Quickshell.screens
//       Bar {}
//   }
//
// Layout mirrors GNOME's: workspaces + vitals left, clock + weather center,
// media + tray + status cluster right.

import Quickshell
import Quickshell.Wayland
import QtQuick
import QtQuick.Effects
import qs.config
import qs.modules.clipboard
import qs.modules.focus

PanelWindow {
    id: root

    // Set by Variants. Left as a plain property (not `required`) so the bar can
    // also be instantiated standalone on the default screen while testing.
    property var modelData: null

    // Raised when the status cluster is clicked; the shell wires this to the
    // quick settings panel, which this module does not own.
    signal requestQuickSettings

    // Bound by the shell when an idle inhibitor is held, so the cluster can
    // show the caffeine glyph.
    property alias idleInhibited: statusCluster.idleInhibited

    screen: root.modelData

    anchors {
        top: true
        left: true
        right: true
    }

    // PanelWindow defaults to an opaque white background.
    color: "transparent"

    implicitHeight: Theme.barHeight

    exclusiveZone: Theme.barHeight

    // Stable namespace for compositor inspection and shell diagnostics.
    WlrLayershell.namespace: "qs-bar"
    WlrLayershell.layer: WlrLayer.Top
    WlrLayershell.keyboardFocus: WlrKeyboardFocus.None

    // The full-width region is intentional: unlike a floating island, a menu
    // bar owns the screen edge. In particular, Workspaces starts at x=0 and
    // spans the full height so scrolling at the literal corner always works.
    mask: Region {
        item: barContent
    }

    // A scrim for wallpapers the bar cannot win against on tone alone. Drawn
    // behind the content rows, fading out downward so the bar still has no
    // hard edge of its own — the point is to darken what is under the text,
    // not to give the bar a surface. Static: a gradient that never changes
    // costs one paint, and this one has nothing to animate.
    Rectangle {
        anchors.fill: parent
        visible: Settings.barBackdrop

        gradient: Gradient {
            GradientStop {
                position: 0.0
                color: Theme.alpha("#0c0e18", 0.55)
            }
            GradientStop {
                position: 1.0
                color: "transparent"
            }
        }
    }

    Item {
        id: barContent

        anchors.fill: parent

        // One shadow for the whole bar rather than one per widget: the content
        // is flattened into a single layer and the halo is drawn under it, so
        // every glyph and label picks it up and nothing has to opt in. Off by
        // default — it only earns its layer on a busy wallpaper.
        layer.enabled: Settings.barTextShadow
        layer.effect: MultiEffect {
            shadowEnabled: true
            shadowColor: "#0a0c14"
            shadowBlur: 0.6
            shadowVerticalOffset: 1
        }

        // ── Left ────────────────────────────────────────────────────────────
        Row {
            anchors.left: parent.left
            anchors.verticalCenter: parent.verticalCenter
            spacing: Theme.itemSpacing

            Workspaces {
                anchors.verticalCenter: parent.verticalCenter
                screen: root.screen
            }

            AgentUsageWidget {
                anchors.verticalCenter: parent.verticalCenter
            }

            VitalsWidget {
                anchors.verticalCenter: parent.verticalCenter
            }
        }

        // ── Center ──────────────────────────────────────────────────────────
        Row {
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.verticalCenter: parent.verticalCenter
            spacing: 2

            Clock {
                anchors.verticalCenter: parent.verticalCenter
            }

            WeatherWidget {
                anchors.verticalCenter: parent.verticalCenter
            }
        }

        // ── Right ───────────────────────────────────────────────────────────
        Row {
            anchors.right: parent.right
            anchors.verticalCenter: parent.verticalCenter
            spacing: Theme.itemSpacing

            CalendarIndicator {
                anchors.verticalCenter: parent.verticalCenter
            }

            HealthIndicator {
                anchors.verticalCenter: parent.verticalCenter
            }

            ActivityIndicator {
                anchors.verticalCenter: parent.verticalCenter
            }

            WallpaperIndicator {
                anchors.verticalCenter: parent.verticalCenter
            }

            FocusIndicator {
                anchors.verticalCenter: parent.verticalCenter
            }

            MediaWidget {
                anchors.verticalCenter: parent.verticalCenter
            }

            ClipboardWidget {
                anchors.verticalCenter: parent.verticalCenter
            }

            Tray {
                anchors.verticalCenter: parent.verticalCenter
            }

            StatusCluster {
                id: statusCluster
                anchors.verticalCenter: parent.verticalCenter
                onRequestQuickSettings: root.requestQuickSettings()
            }
        }
    }
}