#!/usr/bin/env python3
"""Drive Xenia Canary's `--hid=file` pad — the container-safe controller.

Replaces the old `vgamepad` path, which created its device through `/dev/uinput`.
Input devices are not namespaced, so that device registered with the HOST's input
stack and every scripted press leaked to the user's desktop. This one writes a
text file the emulator polls; nothing leaves the container.

    pad.py set   "press=A"          set the pad state and leave it held
    pad.py clear                    release everything
    pad.py tap   A [secs]           press, hold `secs` (default 0.10), release
    pad.py dpad  down [secs]        one menu step (default 0.06 — longer
                                    auto-repeats and overshoots)
    pad.py hold  "lt=255" secs      hold an arbitrary state for `secs`

Buttons: UP DOWN LEFT RIGHT START BACK LS RS LB RB A B X Y.
Path from $XENIA_PAD_FILE, default /tmp/xenia_pad.txt (matches --pad_file).

Menu conventions in this game: A = OK, B = Back, Y = Gallery/extra, X = Delete.
"""

import os
import sys
import time

PAD = os.environ.get("XENIA_PAD_FILE", "/tmp/xenia_pad.txt")


def write(state: str):
    # The driver re-parses on any (mtime-ns, size) change, so a plain rewrite is
    # enough — but write through a temp + rename so a poll can never observe a
    # half-written file.
    tmp = PAD + ".tmp"
    with open(tmp, "w") as f:
        f.write(state)
    os.replace(tmp, PAD)


def main():
    a = sys.argv[1:]
    if not a:
        print(__doc__)
        return 1
    cmd = a[0]
    if cmd == "set":
        write(a[1])
    elif cmd == "clear":
        write("")
    elif cmd == "tap":
        secs = float(a[2]) if len(a) > 2 else 0.10
        write(f"press={a[1]}")
        time.sleep(secs)
        write("")
    elif cmd == "dpad":
        secs = float(a[2]) if len(a) > 2 else 0.06
        write(f"press={a[1].upper()}")
        time.sleep(secs)
        write("")
    elif cmd == "hold":
        write(a[1])
        time.sleep(float(a[2]))
        write("")
    else:
        print(f"unknown command {cmd!r}")
        return 1
    return 0


if __name__ == "__main__":
    raise SystemExit(main())