#!/usr/bin/env bash

function remind() {
    local COUNT="$#"
    local COMMAND="$1"
    local MESSAGE="$1"
    local OP="$2"
    shift 2
    local WHEN="$@"

    # Display help if no parameters or help command
    if [[ $COUNT -eq 0 || "$COMMAND" == "help" || "$COMMAND" == "--help" || "$COMMAND" == "-h" ]]; then
        echo "Usage: remind <message> <time>"
        echo "Examples:"
        echo ' remind "Hi there" now'
        echo ' remind "Time to wake up" in 5 minutes'
        echo ' remind "Dinner" in 1 hour'
        echo ' remind "Take a break" at noon'
        echo ' remind "Are you ready?" at 13:00'
        return
    fi

    # Determine time of notification
    if [[ "$OP" == "in" ]]; then
        local TIME="now + $WHEN"
    elif [[ "$OP" == "at" ]]; then
        local TIME="$WHEN"
    elif [[ "$OP" == "now" ]]; then
        local TIME="now"
    else
        echo "Invalid time operator $OP"
        return
    fi

    # Schedule the notification
    echo "notify-send '$MESSAGE' 'Reminder' -u critical" | at $TIME 2>/dev/null
    echo "Notification scheduled at $TIME"
}

remind "$@"