#!/usr/bin/env python3
"""ft-steam: Steam's menu and checks, through Steam's own UI (steamui.py).

  ft-steam menu    open the SteamVR dashboard on Steam's menu, or close the dashboard if it's
                   open (the Steam button's job, as a shortcut: the input relay's steam_menu)
  ft-steam check   do Steam's UI calls that the above needs still exist (update-check.py)

No pointer mode needed: it asks Steam to show its dashboard overlay (window.ShowVROverlay, what
Steam itself calls) and to focus the Steam frame's left menu (MenuStore.OpenMainMenu, which in
VR invokes the frame's focus_left_frame_menu_action). SteamClient.OpenVR.VROverlay says
whether the dashboard is up and hides it. These are Steam's UI internals, not an API, so a
Steam client update can rename them: `ft-steam check` says so.
"""
import os
import sys

sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)))
from steamui import SteamUnreachable, evaluate  # noqa: E402

WINDOW = "SteamUIStore.WindowStore.VRGamepadUIMainWindowInstance"

MENU = f"""(async () => {{
    const vr = SteamClient.OpenVR.VROverlay;
    if (await vr.IsDashboardVisible()) {{ vr.HideDashboard(); return "closed"; }}
    const w = {WINDOW};
    if (!w) throw new Error("Steam's VR dashboard window isn't open");
    ShowVROverlay(w.GetVROverlayKey());
    // The frame's menu takes focus only once the dashboard is up.
    for (let i = 0; i < 40 && !(await vr.IsDashboardVisible()); i++) await new Promise(r => setTimeout(r, 25));
    w.MenuStore.OpenMainMenu();
    return "opened";
}})()"""

CHECK = f"""(() => {{
    const missing = [];
    const vr = SteamClient.OpenVR && SteamClient.OpenVR.VROverlay;
    for (const f of ["IsDashboardVisible", "HideDashboard"]) if (!vr || typeof vr[f] !== "function") missing.push("SteamClient.OpenVR.VROverlay." + f);
    if (typeof window.ShowVROverlay !== "function") missing.push("ShowVROverlay");
    const w = {WINDOW};
    if (!w) missing.push("{WINDOW}");
    else {{
        if (typeof w.GetVROverlayKey !== "function") missing.push("GetVROverlayKey");
        if (!w.MenuStore || typeof w.MenuStore.OpenMainMenu !== "function") missing.push("MenuStore.OpenMainMenu");
    }}
    return missing;
}})()"""


def main():
    cmd = sys.argv[1] if len(sys.argv) == 2 else ""
    if cmd not in ("menu", "check"):
        sys.exit(__doc__)
    try:
        result = evaluate(MENU if cmd == "menu" else CHECK)
    except SteamUnreachable as e:
        sys.exit(f"ft-steam: {e}")
    if cmd == "check":
        if result:
            sys.exit("Steam's UI lacks " + ", ".join(result))
        print("ok")
    else:
        print(result)


if __name__ == "__main__":
    main()