#!/usr/bin/env bash
# wave-sentinel.sh <sentinel-name> <task> [<task>...]
# Detached watcher: waits for the named workers to stop, then writes a durable
# completion record. Survives the orchestrator exiting, so a FRESH session can
# learn a wave finished without having been present when it happened.
set -u
SENT="$1"; shift
L="$HOME/bookshelf/logs"; OUT="$L/$SENT"
while pgrep -f 'run-task\.sh|run-resume\.sh' >/dev/null; do sleep 30; done
{
  echo "=== $SENT written $(date -Is) ==="
  echo "Workers finished. The orchestrator was NOT necessarily alive for this."
  echo
  for t in "$@"; do
    echo "--- $t ---"
    grep -hE 'SUCCESS|GIVING UP|WALL CLOCK|QUOTA' "$L/$t.state" 2>/dev/null | tail -3
    if [ -s "$L/$t.json" ]; then
      jq -r '"cost=$" + ((.total_cost_usd//0)|tostring) + " turns=" + ((.num_turns//0)|tostring)' "$L/$t.json" 2>/dev/null
    else
      echo "!! $t.json is 0 bytes -> worker was KILLED, not finished (hazard #3/#5)"
    fi
    echo
  done
  echo "NEXT: orchestrator must independently verify before accepting:"
  echo "  cd ~/bookshelf && ./tasks/gw assembleDebug && ./tasks/gw testDebugUnitTest"
  echo "  git status --porcelain   # boundary check: who touched what"
} > "$OUT"