#!/bin/bash
# Claude Code hook (wired in via claude-settings.json) that tracks what Claude is
# doing in each DevDesk session, for the sidebar's at-a-glance status:
#   UserPromptSubmit, PostToolUse -> working
#   Notification                  -> waiting (Claude needs input or a permission)
#   Stop, SessionStart            -> idle
#   SessionEnd                    -> exited
# Fires on every tool call, so it stays tiny and only writes when the state changes.

input=$(cat)

outer=${TMUX:-}
[ "${outer%%,*}" = "${DEVDESK_SOCKET:-/run/devdesk/tmux.sock}" ] && [ -n "${TMUX_PANE:-}" ] || exit 0
session=$(tmux display-message -p -t "$TMUX_PANE" '#S' 2>/dev/null)
[[ $session =~ ^[A-Za-z0-9][A-Za-z0-9_-]{0,63}$ ]] || exit 0

IFS=$'\t' read -r event message < <(jq -rM '[.hook_event_name // "", (.message // "" | gsub("[\t\n]"; " "))] | @tsv' <<<"$input" 2>/dev/null)
case $event in
UserPromptSubmit | PostToolUse) state=working ;;
Notification) state=waiting ;;
Stop | SessionStart) state=idle ;;
SessionEnd) state=exited ;;
*) exit 0 ;;
esac

dir="${DEVDESK_STATE_DIR:-/var/lib/devdesk}/state"
file="$dir/$session.json"
# Unchanged state (the common case during tool runs): nothing to write.
if [ "$state" != waiting ] && [ -f "$file" ] && grep -q "\"state\":\"$state\"" "$file"; then
    exit 0
fi
mkdir -p "$dir" 2>/dev/null || exit 0
tmp=$(mktemp "$dir/.$session.XXXXXX" 2>/dev/null) || exit 0
if jq -cMn --arg s "$state" --arg m "$message" --arg e "$event" \
    '{state: $s, since: (now | floor), event: $e, message: (if $m == "" then null else $m end)}' >"$tmp"; then
    mv -f "$tmp" "$file"
else
    rm -f "$tmp"
fi
exit 0