#!/usr/bin/env bash
# Ding, tab marker and notification for omo sessions on a remote server
# (flowstate-remote), the same as omo-notify gives local sessions. Two paths,
# so each event arrives once:
#
#   Title: the server's omo-notify sets the terminal title of every tmux client
#   attached to the session to "<marker> <project> · omo:<state>:<unix time>",
#   plus ":<question>" when it asks you something, e.g.
#   "🟢 studio · omo:done:1792249251". mosh and ssh carry titles to this Mac
#   (mosh drops the OSC 777 banner). In a tmux pane running mosh or ssh, tmux's
#   pane-title-changed hook (~/.tmux.conf) runs `omo-remote title <pane>`, which
#   hands the event to omo-notify for that pane. A plain Ghostty tab just shows
#   the title, marker first.
#
#   ntfy: the server also posts each finish, error and question to ntfy, tagged
#   "omo", plus "attached" when the title reached a terminal. The launchd agent
#   runs `omo-remote subscribe`, which dings and posts the banner unless a tmux
#   pane here already handled that event through its title. Sessions no terminal
#   shows, and sessions in plain tabs, still notify, and only once. A
#   "mosh-<port>" tag names the mosh connection, so the banner comes from the
#   plain tab running that mosh-client.
#
# Setup: put NTFY_URL, NTFY_TOPIC and NTFY_TOKEN in ~/.config/ntfy/omo-remote.env
# (chmod 600), then run `omo-remote install` once.
#
# Usage: omo-remote title <pane>   (run by the tmux pane-title-changed hook)
#        omo-remote subscribe      (run by the launchd agent)
#        omo-remote message        (run by ntfy for each push; reads $NTFY_*)
#        omo-remote install        (install and start the launchd agent)

# Hooks and launchd run with a minimal PATH; make Homebrew tools reachable.
export PATH="$PATH:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin"

label="local.omo-remote"
conf="${OMO_REMOTE_CONF:-$HOME/.config/ntfy/omo-remote.env}"
log="${OMO_REMOTE_LOG:-$HOME/.local/state/omo-remote.log}"
# An older event happened while you were away (the Mac slept or mosh was
# reconnecting): mark the tab, but skip the ding and the banner.
fresh=120

logline() {
  mkdir -p "$(dirname "$log")"
  printf '%s %s\n' "$(date '+%F %T')" "$*" >>"$log"
}

# Whether a tmux pane here running mosh or ssh got this event through its
# title: the same state and project, stamped within a few seconds of the push.
# The title usually lands first, so give it up to three seconds.
title_got_through() {
  local state=$1 project=$2 sent=$3 i panes
  for ((i = 0; i < 12; i++)); do
    panes=$(tmux list-panes -a -F '#{pane_current_command} #{@omo_remote_event}' 2>/dev/null |
      awk '$1 == "mosh-client" || $1 == "ssh"')
    [[ -n $panes ]] || return 1 # no tmux pane here talks to a server
    awk -v s="$state" -v p="$project" -v t="$sent" '
      { e = substr($0, index($0, " ") + 1)
        i = index(e, ":"); st = substr(e, 1, i - 1); e = substr(e, i + 1)
        i = index(e, ":"); w = substr(e, 1, i - 1) + 0; pr = substr(e, i + 1)
        if (st == s && pr == p && w - t <= 5 && t - w <= 5) found = 1 }
      END { exit !found }' <<<"$panes" && return 0
    sleep 0.25
  done
  return 1
}

# The terminal of a Ghostty tab running mosh or ssh outside tmux: the one on
# the mosh port the push names (tags ",mosh-<port>," in $1), else the newest.
plain_tab_tty() {
  local panes
  panes=$(tmux list-panes -a -F '#{pane_tty}' 2>/dev/null)
  ps -A -o tty=,args= | PANES=$panes TAGS=$1 awk '
    BEGIN { n = split(ENVIRON["PANES"], list, "\n"); for (i = 1; i <= n; i++) pane[list[i]] = 1 }
    { cmd = $2; sub(/.*\//, "", cmd) }
    $1 == "??" || (("/dev/" $1) in pane) || (cmd != "mosh-client" && cmd != "ssh") { next }
    { tty = "/dev/" $1; if (cmd == "mosh-client" && index(ENVIRON["TAGS"], ",mosh-" $NF ",")) named = tty }
    END { if (named != "") print named; else if (tty != "") print tty }'
}

case ${1:-} in
  title)
    pane=${2:?pane id required}
    title=$(tmux display-message -p -t "$pane" '#{pane_title}' 2>/dev/null) || exit 0
    [[ $title == *" · omo:"* ]] || exit 0
    IFS=: read -r state when question <<<"${title#*" · omo:"}"
    [[ $when =~ ^[0-9]+$ ]] || exit 0
    project=${title%%" · omo:"*}
    project=${project#"[mosh] "} # mosh puts "[mosh] " in front
    case $project in "🔵 "* | "🟡 "* | "🟢 "* | "🔴 "*) project=${project#* } ;; esac
    # Act once per event, however often the title is set again. The ntfy
    # handler reads this to tell whether the title already got through.
    event="$state:$when:$project"
    [[ $(tmux show-option -pqv -t "$pane" @omo_remote_event) == "$event" ]] && exit 0
    tmux set-option -p -t "$pane" @omo_remote_event "$event"

    case $state in
      working) payload='{"event":"UserPromptSubmit"}' ;;
      done) payload='{"hook_event_name":"Stop","stopReason":"stop"}' ;;
      error) payload='{"hook_event_name":"Stop","stopReason":"error"}' ;;
      clear) payload='{"hook_event_name":"Stop","stopReason":"aborted"}' ;;
      input) payload=$(jq -cn --arg q "$question" '{hook_event_name:"Notification",kind:"ask-user-asked",title:$q}') ;;
      *) exit 0 ;;
    esac
    if (($(date +%s) - when > fresh)); then
      exec "$HOME/.local/bin/omo-status" set "$pane" "$state"
    fi
    payload=$(jq -c --arg cwd "${project:-remote}" '. + {cwd: $cwd}' <<<"$payload")
    OMO_NOTIFY_PANE=$pane exec "$HOME/.local/bin/omo-notify" <<<"$payload"
    ;;
  subscribe)
    if [[ ! -r $conf ]]; then
      echo "omo-remote: $conf is missing" >&2
      exit 1
    fi
    set -a
    # shellcheck disable=SC1090
    . "$conf"
    set +a
    : "${NTFY_URL:?NTFY_URL is not set in $conf}" "${NTFY_TOPIC:?NTFY_TOPIC is not set in $conf}"
    # ntfy reads the token from $NTFY_TOKEN, which keeps it out of `ps`.
    exec ntfy subscribe "${NTFY_URL%/}/$NTFY_TOPIC" "$(printf '%q' "$0") message"
    ;;
  message)
    tags=",${NTFY_TAGS:-},"
    [[ $tags == *,omo,* ]] || exit 0 # Claude Code posts to the same topic
    (($(date +%s) - ${NTFY_TIME:-0} <= fresh)) || exit 0
    case $tags in
      *,question,*) state=input sound=Ping ;;
      *,x,*) state=error sound=Glass ;;
      *) state="done" sound=Glass ;;
    esac
    # "attached" only says some terminal shows the session: a tmux pane here
    # (the title path has it), a plain tab, or a mosh-server left behind.
    if [[ $tags == *,attached,* ]] &&
      title_got_through "$state" "${NTFY_TITLE##* · }" "${NTFY_TIME:-0}"; then
      logline "ntfy $state ${NTFY_TITLE:-} skipped: a tmux pane got it through the title"
      exit 0
    fi
    afplay "/System/Library/Sounds/${sound}.aiff" >/dev/null 2>&1 &
    # Ghostty posts the banner from a plain tab connected with mosh or ssh, so
    # clicking it lands there, or else from the tmux tab you used last.
    target=$(plain_tab_tty "$tags")
    [[ -n $target ]] ||
      target=$(tmux list-clients -F '#{client_activity} #{client_tty}' 2>/dev/null | sort -rn | awk 'NR == 1 { print $2 }')
    clean() { tr -d '\000-\037\177' <<<"$1" | tr ';' ','; }
    if [[ -n $target && -w $target ]]; then
      printf '\033]777;notify;%s;%s\a' "$(clean "omo: ${NTFY_TITLE:-remote session}")" \
        "$(clean "$(head -n 1 <<<"${NTFY_MESSAGE:-}")")" >"$target"
    fi
    logline "ntfy $state ${NTFY_TITLE:-} target=${target:-none}"
    ;;
  install)
    if [[ ! -r $conf ]]; then
      echo "omo-remote: put NTFY_URL, NTFY_TOPIC and NTFY_TOKEN in $conf first" >&2
      exit 1
    fi
    command -v ntfy >/dev/null || {
      echo "omo-remote: install the ntfy CLI first (brew install ntfy)" >&2
      exit 1
    }
    plist="$HOME/Library/LaunchAgents/$label.plist"
    mkdir -p "$(dirname "$log")" "$(dirname "$plist")"
    cat >"$plist" <<PLIST
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>$label</string>
  <key>ProgramArguments</key>
  <array>
    <string>$HOME/.local/bin/omo-remote</string>
    <string>subscribe</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
  <key>KeepAlive</key>
  <true/>
  <key>ThrottleInterval</key>
  <integer>30</integer>
  <key>StandardOutPath</key>
  <string>$log</string>
  <key>StandardErrorPath</key>
  <string>$log</string>
</dict>
</plist>
PLIST
    launchctl bootout "gui/$(id -u)/$label" 2>/dev/null
    launchctl bootstrap "gui/$(id -u)" "$plist" && echo "omo-remote: listening for ntfy pushes ($plist)"
    ;;
  *)
    sed -n '2,/^$/s/^# \{0,1\}//p' "$0" >&2
    exit 2
    ;;
esac