#!/bin/bash
# On the Brain: show an app that runs on the PC (its window, live; the app is not restarted).
#   pcapp claude | pcapp chatgpt
# Closing the viewer gives the window back to the PC.
app=${1:-claude}
if pgrep -u "$(id -u)" -f "xtightvncviewer .*localhost:6" >/dev/null; then
    if [ "$(cat /tmp/lex01-pcapp-$(id -u) 2>/dev/null)" = "$app" ]; then
        xrestore tightvnc >/dev/null; exit 0      # already showing it: just bring it to the front
    fi
    pkill -u "$(id -u)" -f "xtightvncviewer .*localhost:6"   # showing the other app: switch
    sleep 3
fi
echo "$app" > /tmp/lex01-pcapp-$(id -u)
echo "$app" > /tmp/lex01-request
ok=
for i in $(seq 30); do   # wait until the PC serves the window
    sleep 1
    if exec 3<>/dev/tcp/127.0.0.1/5906 2>/dev/null && read -r -t 3 -n 3 banner <&3 && [ "$banner" = RFB ]; then
        exec 3>&-; ok=1; break
    fi
    exec 3>&- 2>/dev/null
done
[ -n "$ok" ] || { xmessage -center "$app: the PC did not answer (is pc-vnc/start.sh running, is the app open on the PC?)"; exit 1; }
xtightvncviewer -geometry +66+0 -encodings "tight copyrect hextile" -compresslevel 6 -quality 5 localhost:6
# give the window back, unless another pcapp has taken over meanwhile
[ "$(cat /tmp/lex01-pcapp-$(id -u) 2>/dev/null)" = "$app" ] && echo share-stop > /tmp/lex01-request