#!/bin/sh
# cronpup: CronPup's command-line helper (POSIX sh + curl, no other dependencies).
#
#   cronpup run  <monitor> [--] <command> [args...]   start signal, run, report exit code + output tail
#   cronpup ping <monitor> [start|fail|<exit code>]   send one signal
#   cronpup version
#
# <monitor> is the UUID from the monitor's page, a "<ping-key>/<slug>" pair (add ?create=1 to auto-create), or a full
# ping URL. The base is https://cronpup.com unless CRONPUP_URL is set.
# `run` passes the command's exit code and output through unchanged, and problems reaching CronPup never change the
# job's result.
#
# Install:  curl -fsSL https://cronpup.com/install.sh | sh
# Crontab:  0 3 * * *  cronpup run 0b6c4f5e-... -- /opt/jobs/backup.sh
set -u
VERSION=1.0.0
BASE_URL=${CRONPUP_URL:-https://cronpup.com}
BASE_URL=${BASE_URL%/}

usage() {
  sed -n '3,7p' "$0" 2>/dev/null | sed 's/^# \{0,1\}//' >&2 || echo "usage: cronpup run <monitor> [--] <command>" >&2
  exit 64
}

# monitor -> ping URL (query string kept separately so every signal carries it)
resolve() {
  case "$1" in
    http://*|https://*) U=$1 ;;
    */*) U="$BASE_URL/p/$1" ;;
    *) U="$BASE_URL/p/$1" ;;
  esac
  PBASE=${U%%\?*}
  PQUERY=${U#"$PBASE"}
  PBASE=${PBASE%/}
}

send() { curl -fsS -m 10 --retry 3 -o /dev/null -A "cronpup-cli/$VERSION" "$@" 2>/dev/null || true; }

[ $# -ge 1 ] || usage
CMD=$1; shift
case "$CMD" in
  version|--version|-v) echo "cronpup $VERSION"; exit 0 ;;
  help|--help|-h) usage ;;
  ping)
    [ $# -ge 1 ] || usage
    resolve "$1"
    case "${2:-}" in
      '') send "$PBASE$PQUERY" ;;
      start|fail) send "$PBASE/$2$PQUERY" ;;
      *[!0-9]*) echo "cronpup ping: signal must be start, fail or an exit code" >&2; exit 64 ;;
      *) send "$PBASE/$2$PQUERY" ;;
    esac
    exit 0 ;;
  run)
    [ $# -ge 2 ] || usage
    resolve "$1"; shift
    [ "${1:-}" = "--" ] && shift
    [ $# -ge 1 ] || usage
    send "$PBASE/start$PQUERY"
    LOG=$(mktemp "${TMPDIR:-/tmp}/cronpup.XXXXXX" 2>/dev/null) || LOG=""
    RCF=""
    [ -n "$LOG" ] && { RCF=$(mktemp "${TMPDIR:-/tmp}/cronpup-rc.XXXXXX" 2>/dev/null) || RCF=""; }
    if [ -n "$LOG" ] && [ -n "$RCF" ]; then
      { "$@" 2>&1; echo $? > "$RCF"; } | tee "$LOG"
      RC=$(cat "$RCF" 2>/dev/null)
      case "$RC" in ''|*[!0-9]*) RC=1 ;; esac
      tail -c 9000 "$LOG" | send --data-binary @- "$PBASE/$RC$PQUERY"
    else
      "$@"
      RC=$?
      send "$PBASE/$RC$PQUERY"
    fi
    [ -n "$LOG" ] && rm -f -- "$LOG"
    [ -n "$RCF" ] && rm -f -- "$RCF"
    exit "$RC" ;;
  *) usage ;;
esac