pragma Singleton

// ─────────────────────────────────────────────────────────────────────────────
// Shared UI state.
//
// Every overlay in the shell is mutually exclusive with the others -- opening
// the overview should close the quick settings, and so on. Centralising that
// here means no module needs a reference to any other module, and the IPC
// handlers in shell.qml have exactly one thing to talk to.
// ─────────────────────────────────────────────────────────────────────────────

import Quickshell
import QtQuick
import qs.config

Singleton {
    id: root

    // Exactly one of these may be non-empty at a time.
    // "" | "overview" | "quicksettings" | "notifications" | "clipboard" | "capture" | "activity" | "powermenu"
    property string activeOverlay: ""

    readonly property bool overviewOpen: activeOverlay === "overview"
    readonly property bool quickSettingsOpen: activeOverlay === "quicksettings"
    readonly property bool notificationsOpen: activeOverlay === "notifications"
    readonly property bool clipboardOpen: activeOverlay === "clipboard"
    readonly property bool captureOpen: activeOverlay === "capture"
    readonly property bool activityOpen: activeOverlay === "activity"
    readonly property bool powerMenuOpen: activeOverlay === "powermenu"

    // Settings is a normal application window rather than a transient overlay.
    // It can stay open while Quick Settings or the notification center appears.
    property bool settingsOpen: false
    property string settingsPage: "home"

    readonly property bool anyOverlayOpen: activeOverlay !== ""

    // The date menu keeps calendar context fixed while its right pane switches
    // between the schedule, persistent activity and message history.
    property string dateMenuPage: "agenda"

    // 0 means "use the currently focused workspace". A positive value lets a
    // contextual surface, such as Focus, open Mission Control at its target.
    property int overviewWorkspaceId: 0
    property string overviewQuery: ""

    function toggle(name: string): void {
        root.activeOverlay = (root.activeOverlay === name) ? "" : name;
    }

    function open(name: string): void {
        root.activeOverlay = name;
    }

    function openDateMenu(page: string): void {
        root.dateMenuPage = root.normalizedDateMenuPage(page);
        root.activeOverlay = "notifications";
    }

    function toggleDateMenu(page: string): void {
        const target = root.normalizedDateMenuPage(page);
        if (root.activeOverlay === "notifications" && root.dateMenuPage === target) {
            root.activeOverlay = "";
            return;
        }
        root.dateMenuPage = target;
        root.activeOverlay = "notifications";
    }

    function normalizedDateMenuPage(page: string): string {
        return ["agenda", "ongoing", "notifications"].indexOf(page) >= 0 ? page : "agenda";
    }

    function openOverview(workspaceId: int): void {
        root.overviewWorkspaceId = Math.max(0, workspaceId);
        root.overviewQuery = "";
        root.activeOverlay = "overview";
    }

    function searchOverview(query: string): void {
        root.overviewWorkspaceId = 0;
        root.overviewQuery = query;
        root.activeOverlay = "overview";
    }

    function close(): void {
        if (root.activeOverlay === "overview") {
            root.overviewWorkspaceId = 0;
            root.overviewQuery = "";
        }
        root.activeOverlay = "";
    }

    // A section within the page, for pages that have tabs. Consumed once by the
    // page and cleared, rather than bound to -- a binding would pin the tab and
    // stop anyone changing it by hand once they arrived.
    property string settingsSection: ""

    function takeSettingsSection(): string {
        const section = root.settingsSection;
        root.settingsSection = "";
        return section;
    }

    function openSettings(page: string): void {
        root.settingsSection = "";
        root.showSettings(page);
    }

    // Opening straight to a tab within a page. A separate function rather than a
    // default argument: QML has no default parameter values, and writing one
    // fails the whole configuration -- which takes the shell down with it.
    function openSettingsSection(page: string, section: string): void {
        root.settingsSection = section;
        root.showSettings(page);
    }

    function showSettings(page: string): void {
        const allowed = ["home", "appearance", "displays", "connectivity", "home-phone", "desktop", "sound", "gaming", "notifications", "screen-intelligence", "shortcuts", "mouse", "privacy", "region", "accounts", "accessibility", "power", "datetime", "applications", "updates", "storage", "snapshots", "users", "sharing", "firewall", "printers", "containers", "ssh-keys", "services", "about"];
        root.settingsPage = allowed.indexOf(page) >= 0 ? page : "home";
        DesktopPreferences.set("lastPage", root.settingsPage);
        root.settingsOpen = true;
    }

    function toggleSettings(): void {
        if (root.settingsOpen) {
            root.closeSettings();
            return;
        }
        root.openSettings(DesktopPreferences.get("lastPage") || "home");
    }

    function closeSettings(): void {
        root.settingsOpen = false;
    }

    // Set by Dock.qml so the bar can avoid fighting it for pointer grabs, and
    // read by the capture overlay so the dock isn't in the screenshot.
    property bool dockRevealed: false
}