#!/bin/bash

# Antonio Álvarez Feijoo
# 
# Easy and quick way to save things to remember

script_name="remember"
help_text="Try '$script_name --help' for more information."

dir="$HOME/.$script_name/"
if [ ! -d $dir ]; then
    mkdir $dir
fi
notes=(`ls $dir`)
len=${#notes[*]}

case $1 in
    ""|"-a"|"--all")
        if [ $len -eq 0 ]; then
            echo "There is nothing to remember."
        else
            dayofweek=`date +%W`
            i=0
            while [ $i -lt $len ]; do
                #echo -n `expr $i + 1`" - "
                printf "%2d   " $(($i + 1))
                note_dayofweek=`date -d '1970-01-01 '${notes[$i]}' sec GMT' +%W`
                if [ $dayofweek -eq $note_dayofweek ]; then
                    day=`date +%D`
                    note_day=`date -d '1970-01-01 '${notes[$i]}' sec GMT' +%D`
                    if [ $note_day = $day ]; then
                        printf "%9s" "Today"
                    else
                        printf "%9s" `date -d '1970-01-01 '${notes[$i]}' sec GMT' +%A`
                    fi
                else
                    printf "%9s" `date -d '1970-01-01 '${notes[$i]}' sec GMT' +%D`
                fi
                printf " %8s   " `date -d '1970-01-01 '${notes[$i]}' sec GMT' +%T`
                echo "`cat $dir${notes[$i]}`"
                let i++
            done
        fi;;

    -[1-9]|-[1-9][0-9]*)

        trick=$(( ($1 * -1) - 1))
        note="${notes[$trick]}"
        if [ -z "$note" ]; then
            echo "Thing to remember number $(($trick + 1)) doesn't exist."
        else
            echo "`cat $dir$note`"
        fi;;

    "-r"|"--remove")
        if [ $# -lt 2 ]; then
            echo -e "$script_name: missing option\n\
$help_text"
            exit 1
        fi
        
        case $2 in
            "all"|"ALL")
                rm -f ${dir}*
                echo "$len things to remember removed.";;

            [1-9]|[1-9][0-9]*)
                #notetorm="${notes[`expr $2 - 1`]}"
                notetorm="${notes[$(($2 - 1))]}"
                if [ -z "$notetorm" ]; then
                    echo "Thing to remember number $2 doesn't exist."
                else
                    rm -f ${dir}${notetorm}
                    echo "Thing to remember number $2 removed."
                fi;;
                
            *)
                echo -e "$script_name: incorrect argument\n\
$help_text"
                exit 1;;
        esac;;

    "-h"|"--help")
        echo -e "Usage: $script_name [OPTION|TEXT]...\n\
With no OPTION save a thing to remember.\n\
\n\
  -a, --all                    print all things to remember\n\
  -NUMBER                      print thing to remember NUMBER\n\
  -r, --remove [NUMBER|ALL]    remove thing to remember NUMBER or ALL\n\
  -h, --help                   display this help\n";;

    *)
        timestamp=`date +%s`
        for token in $*; do
            echo -n $token" " >> $dir$timestamp
        done;;
esac