// The overview — a replacement for GNOME's Activities. Opened with Super+grave
// (the lead wires the IPC; this file only reacts to ShellState.overviewOpen).
//
// The compositor blurs and dims what is behind this surface via the
// `qs-overlay` layer rule; the scrim below adds the tint on top of that.

import Quickshell
import Quickshell.Wayland
import Quickshell.Hyprland
import QtQuick
import qs.config
import qs.services

PanelWindow {
    id: root

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

    color: "transparent"
    exclusiveZone: 0
    exclusionMode: ExclusionMode.Ignore

    // Matched by the `qs-overlay` layer rule in hypr/rules.lua — do not rename.
    WlrLayershell.namespace: "qs-overview"
    WlrLayershell.layer: WlrLayer.Overlay
    WlrLayershell.keyboardFocus: root.open ? WlrKeyboardFocus.Exclusive : WlrKeyboardFocus.None

    readonly property bool open: ShellState.overviewOpen

    // The window has to stay mapped for the length of the close animation,
    // otherwise it vanishes instantly and only the open transition is ever
    // seen. `mapped` tracks overviewOpen, delayed on the way down.
    property bool mapped: false
    visible: mapped

    // Each open bumps the token, which makes every thumbnail re-capture once.
    // Nothing captures while the overview is closed or idle.
    property int refreshToken: 0

    onOpenChanged: {
        if (open) {
            unmapTimer.stop();
            // The IPC/toplevel caches can lag a fast workspace switch.
            Hyprland.refreshWorkspaces();
            Hyprland.refreshToplevels();
            mapped = true;
            refreshToken++;
            Qt.callLater(() => body.prepare());
        } else {
            unmapTimer.restart();
        }
    }

    Timer {
        id: unmapTimer
        interval: Theme.durNormal
        onTriggered: root.mapped = false
    }

    Item {
        id: surface
        anchors.fill: parent
        focus: true

        Keys.onEscapePressed: ShellState.close()

        opacity: root.open ? 1 : 0

        Behavior on opacity {
            NumberAnimation {
                duration: Theme.durNormal
                easing.type: Easing.OutCubic
            }
        }

        transform: Scale {
            origin.x: surface.width / 2
            origin.y: surface.height / 2
            xScale: root.open ? 1 : 0.96
            yScale: xScale

            Behavior on xScale {
                NumberAnimation {
                    duration: Theme.durNormal
                    easing.type: Easing.OutCubic
                }
            }
        }

        Rectangle {
            anchors.fill: parent
            color: Theme.alpha(Theme.bgDark, Theme.overlayAlpha)

            // Clicking anywhere that is not a card dismisses, as in GNOME.
            MouseArea {
                anchors.fill: parent
                onClicked: ShellState.close()
            }
        }

        OverviewBody {
            id: body
            anchors.fill: parent
            refreshToken: root.refreshToken
            open: root.open
        }
    }
}