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

userNick="$1"
chan="$2"
# $3 contains the entire argument string (e.g., "30s hello world")
# We need to split it into time and message
# shellcheck disable=SC2086
set -- $3  # Intentionally unquoted to split into separate words
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 - add 's' suffix if no time unit specified
if ! [[ "$time" =~ ^[0-9]+[HhMmSs]$ ]]; then
  # Check if it's just a number without a unit
  if [[ "$time" =~ ^[0-9]+$ ]]; then
    time="${time}s"
  else
    msg "$chan" "$userNick: Time must be numeric (e.g., 30s, 5m, 1h)."
    exit 0
  fi
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

# Convert message to array for easier parsing
# shellcheck disable=SC2206
msgArray=($*)
targetNick="$userNick"  # Default target is the person who set the reminder

# Handle 'tell' syntax for targeting other users
if [[ "${msgArray[0],,}" == "tell" ]]; then
  # Extract target nickname (second element, strip trailing punctuation)
  extractedNick="${msgArray[1]}"
  extractedNick="${extractedNick%:}"
  extractedNick="${extractedNick%,}"

  # Set target and rebuild message without "tell nickname"
  targetNick="$extractedNick"
  # Rebuild message from element 2 onward
  reminderMessage="${msgArray[*]:2}"
else
  reminderMessage="$*"
fi

msg "$chan" "ok, $userNick, reminder in $time."

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