#!/bin/bash

_helpexit() {
  echo "# Example cron:"
  _get_cron_template
  echo "
# Cron run, arg is one of:
  reboot hourly daily weekly monthly all list help
  all runs all targets but not reboot
  "
  exit 1
}

_get_cron_template() {
  min=$(( $RANDOM % 20 ))
  echo "
### CRON user run ###
@reboot $0 reboot
$min *    * * *   $0 hourly
$(( $min + 10 )) 4    * * *   $0 daily
$(( $min + 20 )) 4    * * 1   $0 weekly
$(( $min + 30 )) 4    1 * *   $0 monthly
### CRON user run END ###"
}

_install() {
  crontab -l 2>/dev/null | grep -q cron-user-run && {
      echo "Already installed"
      return
  }
  echo "Installing"
  crontab -l 2>/dev/null
  tmpfile=$( mktemp )
  crontab -l > "$tmpfile" 2>/dev/null
  set -e
  _get_cron_template >> "$tmpfile"
  crontab "$tmpfile"
  rm "$tmpfile"
  crontab -l
  return
}

if [ -z "$1" ];then
  _helpexit
fi
# SETUP
cd $HOME
LOG="$HOME/.log/cron.log"
TSF="%Y-%m-%d %H:%M:%S [$1]"
CRONBASE="$HOME/.local/etc/cron"
mkdir -p "$HOME/.log"
for task in hourly daily weekly monthly reboot; do
  if [[ ! -e "$CRONBASE"/"$task" ]]; then
    mkdir -p "$CRONBASE"/"$task"
  fi
done
if [[ ! -e ~/.log/logrotate.conf ]]; then
  cat <<EOF > ~/.log/logrotate.conf
$HOME/.log/*.log {
    monthly
        missingok
        rotate 12
        compress
        delaycompress
        notifempty
}
EOF
fi
if [[ ! -e "$CRONBASE"/daily/000-logrotate ]]; then
  cat <<EOF > "$CRONBASE"/daily/000-logrotate
#!/bin/bash

/usr/sbin/logrotate -s ~/.log/logrotate.state ~/.log/logrotate.conf
EOF
  chmod +x "$CRONBASE"/daily/000-logrotate
fi

case "$1" in
  help|-h|--help)
    _helpexit
    ;;
  all)
    for task in hourly daily weekly monthly; do
      "$0" $task
    done
    exit $?
    ;;
  list)
    if [[ -e "$LOG" ]]; then
      echo "===================="
      echo "Log: $LOG"
      tail -n 10 "$LOG"
      echo "===================="
    fi
    for task in hourly daily weekly monthly reboot; do
      if [[ -e "$CRONBASE"."$task" ]]; then
         echo "$CRONBASE"."$task"
         ls -1 "$CRONBASE"."$task" | sed 's/^/  /'
      fi
      if [[ -e "$CRONBASE"/"$task" ]]; then
         echo "$CRONBASE"/"$task"
         ls -1 "$CRONBASE"/"$task" | sed 's/^/  /'
      fi
    done
    exit $?
    ;;
  install)
    _install
    ;;
  hourly|daily|weekly|monthly|reboot)
    echo "Running user cron $1" | ts -m "$TSF" >> "$LOG"
    if [[ -e "$CRONBASE"."$task" ]]; then
      run-parts --report -v "$CRONBASE"."$1" 2>&1 | ts -m "$TSF" >> "$LOG"
    fi
    if [[ -e "$CRONBASE"/"$task" ]]; then
      run-parts --report -v "$CRONBASE"/"$1" 2>&1 | ts -m "$TSF" >> "$LOG"
    fi
    ;;
esac