#! /bin/sh -e

if [ $# -ne 1 ]; then
    echo "Usage: $0 TEAM" 1>&2
    exit 64
fi

escape () {
    sed 's/&/\&amp;/g;s/</\&lt;/g;s/>/\&gt;/g'
}

# Don't overwrite files
set -C

base=${CTF_BASE:-/var/lib/ctf}
www=${CTF_BASE:-/var/www}

mkdir -p $base/teams/names
mkdir -p $base/teams/colors

# Assign a color.  I spent weeks selecting a color pallette that
# wouldn't be hell on people with protanopia.  Please don't change these
# colors.
nteams=$(ls $base/teams/names/ | wc -l)
case $(expr $nteams % 10) in
    0) color=a6cee3;;
    1) color=1f78b4;;
    2) color=b2df8a;;
    3) color=33a02c;;
    4) color=fb9a99;;
    5) color=e31a1c;;
    6) color=fdbf6f;;
    7) color=ff7f00;;
    8) color=cab2d6;;
    9) color=6a3d9a;; 
    *)
        echo 'ERROR ERROR' 1>&2
        echo 'DOES NOT COMPUTE' 1>&2
        exit 69
        ;;
esac

# Compute hash of team name; they'll use this for everything in the
# contest instead of their team name, which makes stuff much easier on
# me since all team hashes are in the set /[0-9a-f]{8}/.
hash=$(echo "not a nonce:::$1" | md5sum | cut -b 1-8)

echo "$1" > $base/teams/names/$hash
echo "$color" > $base/teams/colors/$hash

echo "Registered with hash: $hash"

# Create encrypted listing of teams
ls $base/teams/names | KEY="Too much cheese." | /opt/mcp/bin/arc4 > $www/teams.txt