#!/usr/bin/env bash
[ -f functions.sh ] && source functions.sh

userNick="$1"
shift
chan="$1"
shift
time="$1"
shift

# Validate time argument is provided
if [[ -z "$time" ]]; then
  msg "$chan" "$userNick: Please provide a time (e.g., 30s, 5m, 1h)."
  exit 0
fi

# Normalize time format
if ! [[ "$time" =~ ^[0-9]+[HhMmSs]$ ]]; then
  time="${time}s"
fi

# Validate time is numeric
if ! [[ "${time%[HhMmSs]}" =~ ^[0-9]+$ ]]; then
  msg "$chan" "$userNick: Time must be numeric (e.g., 30s, 5m, 1h)."
  exit 0
fi

# Validate time is reasonable (max 24 hours)
timeValue="${time%[HhMmSs]}"
timeUnit="${time: -1}"
case "${timeUnit,,}" in
  h) maxTime=24; timeInSeconds=$((timeValue * 3600)) ;;
  m) maxTime=1440; timeInSeconds=$((timeValue * 60)) ;;
  s) maxTime=86400; timeInSeconds=$timeValue ;;
  *) maxTime=86400; timeInSeconds=$timeValue ;;
esac

if [[ $timeValue -gt $maxTime ]]; then
  msg "$chan" "$userNick: Maximum time is 24 hours."
  exit 0
fi

# Validate reminder message is provided
if [[ -z "$*" ]]; then
  msg "$chan" "$userNick: Please provide a reminder message."
  exit 0
fi

msg "$chan" "ok, $userNick, reminder in $time."
reminderMessage="$@"

# Handle 'tell' syntax for targeting other users
if [[ "$reminderMessage" =~ ^[Tt]ell[[:space:]]+ ]]; then
  targetNick="$(echo "${reminderMessage#[T|t]ell }" | cut -d ' ' -f1)"
  # Validate nick doesn't contain invalid characters
  if [[ "$targetNick" =~ ^[a-zA-Z0-9_\[\]\{\}\\|\`\^\-]+$ ]]; then
    userNick="$targetNick"
    reminderMessage="${reminderMessage#[Tt]ell }"
    reminderMessage="${reminderMessage#* }"
  fi
fi

sleep "$timeInSeconds" && msg "$chan" "$userNick: $reminderMessage" &