#!/usr/bin/env bash
# codex-crew: deterministic wrapper around `codex exec` with stall watchdog.
#
# Usage:
#   codex-run.sh <job_dir> exec   [codex-flags...] [prompt]
#   codex-run.sh <job_dir> resume <thread_id> [codex-flags...] [prompt]
#   codex-run.sh <job_dir> review [--base X|--commit Y|--uncommitted] [codex-flags...] [prompt]
#
# If <job_dir>/prompt.md is non-empty it is always fed via stdin ('-'); codex-flags
# stay positional, so options and a file prompt combine freely.
# Review runs against the git repo at the CURRENT WORKING DIRECTORY (no -C support).
# Review mode: codex CLI forbids combining scope flags (--base/--commit/--uncommitted)
# with a positional [PROMPT] — and stdin '-' counts as PROMPT. So with a non-empty
# prompt.md the scope flag is translated into prompt text and review runs with custom
# instructions only; with an empty prompt.md the native `review <scope>` is used.
#
# Files written to <job_dir>: events.jsonl last.md err.log thread_id status
# status: ok | stalled | error: <reason>.  Exit code 0 only on ok.
#
# Env knobs:
#   CODEX_STALL_TIMEOUT  seconds of event silence before kill (default 600)
#   CODEX_WATCH_INTERVAL watchdog poll interval seconds (default 15)
#   CODEX_BIN            codex binary (default codex; tests use a stub)
set -u

JOB_DIR=$1; MODE=$2; shift 2
mkdir -p "$JOB_DIR"
JOB_DIR=$(cd "$JOB_DIR" && pwd)
EV=$JOB_DIR/events.jsonl LAST=$JOB_DIR/last.md ERR=$JOB_DIR/err.log
PF=$JOB_DIR/prompt.md
STALL=${CODEX_STALL_TIMEOUT:-600}
TICK=${CODEX_WATCH_INTERVAL:-15}
BIN=${CODEX_BIN:-codex}

case $MODE in
  exec)   CMD=("$BIN" exec --json --skip-git-repo-check -o "$LAST") ;;
  resume) TID=$1; shift; printf '%s\n' "$TID" > "$JOB_DIR/thread_id"
          CMD=("$BIN" exec resume "$TID" --json --skip-git-repo-check -o "$LAST") ;;
  review)
    if [[ -s $JOB_DIR/prompt.md ]]; then
      # scope flags conflict with a prompt at the CLI level — move scope into text
      SCOPE_DESC=""; REST=()
      while [[ $# -gt 0 ]]; do
        case $1 in
          --base) SCOPE_DESC="Review the changes on the current branch against base ref '$2' — run \`git diff $2...HEAD\` (merge-base) to see the full change set."; shift 2 ;;
          --commit) SCOPE_DESC="Review the changes introduced by commit '$2' — run \`git show $2\` to see them."; shift 2 ;;
          --uncommitted) SCOPE_DESC="Review all uncommitted changes (staged, unstaged, untracked) — run \`git status\` and \`git diff HEAD\` to see them."; shift ;;
          *) REST+=("$1"); shift ;;
        esac
      done
      if [[ -n $SCOPE_DESC ]]; then
        PF=$JOB_DIR/prompt.final.md
        { printf 'This is a code review task. %s\n\n' "$SCOPE_DESC"; cat "$JOB_DIR/prompt.md"; } > "$PF"
      fi
      set -- ${REST[@]+"${REST[@]}"}
    fi
    CMD=("$BIN" exec review --json --skip-git-repo-check -o "$LAST") ;;
  *) echo "usage: codex-run.sh <job_dir> exec|resume|review ..." >&2; exit 2 ;;
esac

rm -f "$JOB_DIR/status" "$LAST"; : > "$EV"; : > "$ERR"

if [[ -s $PF ]]; then
  "${CMD[@]}" "$@" - < "$PF" > "$EV" 2> "$ERR" &
else
  "${CMD[@]}" "$@" < /dev/null > "$EV" 2> "$ERR" &
fi
PID=$!

( while kill -0 "$PID" 2>/dev/null; do
    sleep "$TICK"
    now=$(date +%s); mt=$(stat -c %Y "$EV" 2>/dev/null || echo "$now")
    if (( now - mt > STALL )); then
      echo stalled > "$JOB_DIR/status"
      kill "$PID" 2>/dev/null; sleep 3; kill -9 "$PID" 2>/dev/null
      break
    fi
  done ) &
WATCH=$!

wait "$PID"; RC=$?
kill "$WATCH" 2>/dev/null; wait "$WATCH" 2>/dev/null

TID_FOUND=$(grep -m1 -o '"thread_id":"[^"]*"' "$EV" | cut -d'"' -f4)
[[ -n $TID_FOUND ]] && printf '%s\n' "$TID_FOUND" > "$JOB_DIR/thread_id"

if [[ -s $JOB_DIR/status ]]; then
  : # stalled, written by watchdog
elif [[ $RC -eq 0 && -s $LAST ]]; then
  echo ok > "$JOB_DIR/status"
else
  echo "error: exit=$RC $(tail -c 300 "$ERR" | tr '\n' ' ')" > "$JOB_DIR/status"
fi

ST=$(head -n1 "$JOB_DIR/status")
echo "status: $ST"
echo "thread_id: $(cat "$JOB_DIR/thread_id" 2>/dev/null || echo none)"
[[ $ST == ok ]]