import QtQuick
import QtQuick.Shapes
import QtQuick.Layouts
import Quickshell
import Quickshell.Hyprland
import Quickshell.Wayland
import qs.hyprchrome.widgets
import qs.hyprchrome.widgets.host
import qs.hyprchrome.widgets.vitals
import qs.hyprchrome.widgets.tray

Scope {
  id: root

  // Monitor the rail lives on. Falls back to the FIRST connected screen when
  // the name matches nothing, so the bar still appears on a single-monitor
  // session or after a cable swap (DebugWindow falls back to the last one
  // instead — it wants the secondary).
  property string screenName: "DP-2"

  // Quickshell.screens is a QML list, not a JS array — no .find() on it.
  readonly property var targetScreen: {
    const screens = Quickshell.screens;
    if (screens.length === 0)
      return null;
    for (let i = 0; i < screens.length; i++) {
      if (screens[i].name === root.screenName)
        return screens[i];
    }
    return screens[0];
  }

  // Density is a property of the BAR: every panel follows it, so the whole rail
  // expands and collapses as one. Panels keep their own animation; only the
  // decision is centralised here.
  property bool expanded: true

  function toggle() {
    root.expanded = !root.expanded;
  }

  // SUPER A — see hosts/terra/home/hyprland.nix.
  GlobalShortcut {
    name: "chrome"
    description: "Expand or collapse the hyprchrome bar"
    onPressed: root.toggle()
  }

  // Scrim first: it is a layer below the bar, so stacking does not depend on
  // creation order, but keeping the declaration order the same as the visual
  // order costs nothing.
  ChromeBackdrop {
    screen: root.targetScreen
    active: root.expanded
  }

  PanelWindow {
    id: window

    screen: root.targetScreen
    visible: root.targetScreen !== null

    // One layer above the scrim, so the stacking is guaranteed rather than
    // dependent on surface creation order. See ChromeBackdrop.
    // Own namespace so a layerrule can exempt the rail from Hyprland's layer
    // animation without also catching the launchers, which share the default
    // "quickshell" namespace and do want their fade.
    WlrLayershell.namespace: "hyprchrome-bar"
    WlrLayershell.layer: WlrLayer.Overlay

    property int margin: 12

    // The surface never resizes: it is always tall enough for the expanded
    // rail, and only the exclusive zone tracks the current state. Resizing a
    // layer surface makes Hyprland animate the change, which showed up as the
    // panels twitching a pixel or two the moment the collapse finished.
    //
    // The zone still follows the target height, so tiled windows reflow once
    // per toggle, at the start, and slide while the panels animate.
    readonly property real expandedContent: Math.max(hostPanel.expandedHeight, vitalsPanel.expandedHeight, trayPanel.expandedHeight) + window.margin * 2
    readonly property real contentHeight: Math.max(hostPanel.targetHeight, vitalsPanel.targetHeight, trayPanel.targetHeight) + window.margin * 2

    implicitHeight: Math.round(window.expandedContent)

    exclusionMode: ExclusionMode.Normal
    exclusiveZone: Math.round(window.contentHeight)

    // Only the panels take input. Without this the surface would keep eating
    // clicks across its full height while the rail is collapsed.
    mask: Region {
      item: panelRow
    }

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

    color: "transparent"

    RowLayout {
      id: panelRow
      x: window.margin
      y: window.margin
      width: window.width - window.margin * 2
      spacing: 8

      HostPanel {
        id: hostPanel

        expanded: root.expanded
        toggleOnClick: false
        Layout.preferredWidth: 350
        Layout.fillHeight: true
      }

      VitalsPanel {
        id: vitalsPanel

        expanded: root.expanded
        toggleOnClick: false
        Layout.preferredWidth: 500
        Layout.fillHeight: true
      }

      // Slack lives between the left group and the tray, so the tray sits
      // flush right whatever the other panels measure.
      Item { Layout.fillWidth: true }

      TrayPanel {
        id: trayPanel

        expanded: root.expanded
        toggleOnClick: false
        Layout.fillHeight: true
      }
    }
  }
}