#!/bin/sh

usage()
{
    cat <<EOF
Usage: $0 [-h|--help] [-n|--no-save] [-s|--save]
EOF
}

DO_SAVE=y

eval set -- "$(getopt -o 'hsn' --long '-help,-save,-no-save' -n 'musopen' -- "$@")" || exit 1
while true; do
    case "$1" in
        -h|--help) usage; exit ;;
        -s|--save) DO_SAVE=y ;;
        -n|--no-save) DO_SAVE= ;;
        --) shift; break ;;
        *) usage; exit 1 ;;
    esac
    shift
done

URL=https://radio.musopen.org/v1/pieces/get_current/streamvbr0
JSON=$(curl -s "$URL")
URL_FMT='https://live.musopen.org/music/vbr0/%s'

j() {
    printf %s "$JSON" | jq -r "$@"
}

filename=$(j .filename)
composer=$(j .composer.full_name)
title=$(j .title)

STREAM_URL=$(printf "$URL_FMT" "$filename")

CAPTURE_NAME="$composer - $title.${filename##*.}"

if [ "$DO_SAVE" -a -e "$CAPTURE_NAME" ]; then
    echo "Warning: not saving: file exists: $CAPTURE_NAME" >&2
    DO_SAVE=
else
    printf '%s: %s - %s\n' "${DO_SAVE+Saving}${DO_SAVE-Playing}" "$composer" "$title" >&2
fi


exec mpv "$STREAM_URL" ${DO_SAVE+ --stream-capture="$CAPTURE_NAME"}