pragma Singleton

import Quickshell
// Required: execDetached's context overload takes a processContext value type
// from this module, and without the import the call fails to resolve.
import Quickshell.Io
import qs.config

// Quickshell's DesktopEntry.execute() deliberately ignores both Terminal=true
// and Exec field codes, so entries are launched here instead. Without this,
// entries like `firefox %U` are started with a literal "%U" argument.
Singleton {
    id: root

    // Set only when att_menu itself was started by systemd, which is the one
    // case where the control group is worth escaping. Started from a shell or
    // by the compositor the panel shares the session's group, and wrapping
    // would buy nothing.
    readonly property bool inSystemdUnit: !!Quickshell.env("INVOCATION_ID")

    // Moves a launched app into a transient scope of its own, outside att_menu's
    // control group. Stopping a systemd unit signals every process in its group
    // and execDetached's fork does not leave it, so without this the panel takes
    // down everything it ever launched — which is what happens each time tablet
    // mode ends and the unit is stopped.
    //
    // A scope, not a service: the app keeps the environment, working directory
    // and stdio it was given, so WAYLAND_DISPLAY and friends still reach it.
    // The exec'd shell leaves no process of its own behind, and passing the app
    // as "$@" keeps its arguments intact. systemd-run is only assumed to be on
    // PATH when it is actually there — the panel runs on systems packaged
    // without it too.
    readonly property var scopeWrapper: ["sh", "-c", "command -v systemd-run >/dev/null 2>&1 && exec systemd-run --user --scope --collect --quiet -- \"$@\"; exec \"$@\"", "att_menu"]

    function withoutFieldCodes(command: var): var {
        const out = [];

        for (const arg of command) {
            // "%%" is an escaped percent and collapses to one. Every other
            // %<char> is a field code the spec says to substitute with files,
            // URLs or icons — launching from a menu has nothing to substitute,
            // so they are removed.
            const cleaned = arg.replace(/%(.)/g, (match, char) => char === "%" ? "%" : "");

            // An argument that was nothing but a field code is dropped.
            if (cleaned !== "")
                out.push(cleaned);
        }

        return out;
    }

    function launch(entry: var): void {
        const command = root.withoutFieldCodes(entry.command);
        if (command.length === 0)
            return;

        const argv = entry.runInTerminal ? [...Config.terminal, ...command] : command;
        const options = {
            command: root.inSystemdUnit ? [...root.scopeWrapper, ...argv] : argv
        };

        if (entry.workingDirectory)
            options.workingDirectory = entry.workingDirectory;

        Quickshell.execDetached(options);
    }
}