addpoints

#!/usr/bin/env bash

set -e
set -o pipefail

usage() {
    echo "Usage: $0 [options] INPUT OUTPUT"
    echo "options:"
    echo "  -b    R,G,B,A         Set the BG color as a rgba tuple. Defaults to 0,255,0,1"
    echo "  -c    CX,CY,RADIUS    Draw a circle at coordinates"
}

circle_cli() {
    if [[ $# -ne 3 ]]; then
        echo "Usage: circle_cli CX CY RADIUS" >&2
        return 1
    fi
    cx=$1
    cy=$2
    radius=$3
    echo "circle $cx,$cy,$((cx + radius)),$cy"
}

# color is rgba
color=0,255,0,1

convertcmd=convert
typeset -a convert_args
convert_args+=("-strokewidth" "0")

# TODO: option parsing
while getopts 'b:c:' opt; do
    case $opt in
    b)
        color=$OPTARG
        ;;
    c)
        convert_args+=("-draw" "$(circle_cli $(tr , ' ' <<<$OPTARG))")
        ;;
    \?)
        echo "Unrecognized option: $OPTARG" >&2
        exit 2
    esac
done
shift $((OPTIND - 1))

if [[ $# -ne 2 ]]; then
    usage >&2
    exit 2
fi
in=$1
out=$2

$convertcmd "${convert_args[@]}" -fill "rgba($color)" "$in" "$out"

if [[ ! -f "$out" ]]; then
    echo "Error: can't find output file" >&2
    exit 1
fi
exit 0