#!/bin/sh

VCF_DIR=~/.contacts/contacts
DELTAD=10

today="$(date '+%Y %m %d')"
ty="${today:0:4}"
tm="${today:5:2}"
td="${today:8:2}"
now="$(date +%s)"

display=''

for vcf in "$VCF_DIR"/*.vcf ; do
    bday_raw="$(cat $vcf | grep BDAY)"
    if [ -z "$bday_raw" ] ; then continue ; fi
    bday_raw="$(echo $bday_raw | cut -d ':' -f 2)"
    bday_raw=${bday_raw:0:-1}
    echo $bday_raw | grep '-' &>/dev/null
    # format yyyy-mm-dd
    if [ $? -eq 0 ] ; then
        year="${bday_raw:0:4}"
        month="${bday_raw:5:2}"
        day="${bday_raw:8:2}"
    # format yyyymmdd
    elif [ ${#bday_raw} -eq 8 ] ; then
        year="${bday_raw:0:4}"
        month="${bday_raw:4:2}"
        day="${bday_raw:6:2}"
    # unknown format
    else
        echo "Impossible to determine date format for: $bday_raw"
        continue
    fi

    # Is the bday after or before today in civil year?
    # This comparison can make dalta negative. Be careful with next instructions.
    if [ "$month$day" -lt "$tm$td" ] ; then
        ((nextbday_year=$ty+1))
    else
        nextbday_year=$ty
    fi

    # How many days to next bday
    nextbday_stamp=$(date --date="$nextbday_year$month$day" +%s)
    ((delta_s=$nextbday_stamp-$now))
    ((delta_d=$delta_s/3600/24))
    
    # Get all bdays
    if [ "$delta_d" -le "$DELTAD" ] ; then
        name="$(cat $vcf | grep 'FN:' | cut -d ':' -f 2)"
        display="$display${name:0:-1} : $year-$month-$day\n"
    fi

done
# Send notification if date is close
notify-send "Anniversaires" "$display"