#!/usr/bin/env bash

version=0.5
SYSTEMPONIES=/usr/share/ponies
HOMEPONIES="${HOME}/.ponies"
pony="*"
wrap=

cmd=cowsay
[[ ${0} == *ponythink ]] && cmd=cowthink

version() {
    echo "ponysay v$version"
}

usage() {
    version
    cat <<EOF

Usage:
${0##*/} [options] [message]

If [message] is not provided, reads the message from STDIN

Options:
  -v          Show version and exit
  -h          Show this help and exit
  -f[name]    Select a pony (Either a filename or a pony name)
  -W[column]  The screen column where the message should be wrapped
EOF
}

say() {
    # Ponies use UTF-8 drawing characters. Prevent a Perl warning.
    export PERL_UNICODE=S

    exec "$cmd" -f "$pony" "${wrap:+-W$wrap}"
}

while getopts f:W:hv OPT
do
    case ${OPT} in
        v)  version; exit ;;
        h)  usage; exit ;;
        f)  pony="$OPTARG" ;;
        W)  wrap="$OPTARG" ;;
        \?) usage >&2; exit 1 ;;
    esac
done
shift $((OPTIND - 1))

if ! hash $cmd &>/dev/null; then
    cat >&2 <<EOF
You don't seem to have the $cmd program.
Please install it in order to use this wrapper.

Alternatively, symlink it to '$cmd' in anywhere in \$PATH
if it actually exists under a different filename.
EOF
    exit 1
fi

if [[ ! -f $pony ]]; then
    # Pony not a file? Search for it

    ponies=()
    [[ -d $SYSTEMPONIES ]] && ponies+=( "$SYSTEMPONIES"/$pony.pony )
    [[ -d $HOMEPONIES ]] && ponies+=( "$HOMEPONIES"/$pony.pony )

    if (( ${#ponies} < 1 )); then
        echo >&2 "All the ponies are missing! Call the Princess!"
        exit 1
    fi

    # Choose a random pony
    pony="${ponies[$RANDOM%${#ponies[@]}]}"
fi

if [[ -n "$*" ]]; then
  # Handle a message given via arguments
  say <<<"$*"
else
  say
fi