#!/bin/sh
set -eu

PROG="$(basename "${0}")"
SOCKET_PATH="/tmp/mpv-${USER}.sock"

die() {
    echo "Error: $*" >&2
    exit 1
}

usage() {
    cat <<EOF
Usage: ${PROG} <command> [args]

Commands:
  run music [PATH]       Play local music (default: ~/Music)
  run radio <CHANNEL>    Start a radio station
  radio <CHANNEL>        Switch current playing instance to a radio station
  next, n                Next track
  prev, p                Previous track
  pause, space           Toggle pause
  help                   Show this message

Radio Channels:
  lofi, fallout, wasteland, retrofm, rusradio, rock, phonk, dorognoe
EOF
}

get_radio_url() {
    channel="${1:-}"
    case "${channel}" in
        lofi)      echo 'https://radiorecord.hostingradio.ru/lofi96.aacp' ;;
        fallout)   echo 'http://fallout.fm:8000/falloutfm1.ogg' ;;
        wasteland) echo 'http://wasteland.su:8080/radio' ;;
        retrofm)   echo 'http://hls-01-retro.emgsound.ru/12/128/playlist.m3u8' ;;
        rusradio)  echo 'https://rusradio.hostingradio.ru/rusradio128.mp3' ;;
        rock)      echo 'https://radiorecord.hostingradio.ru/rock96.aacp' ;;
        phonk)     echo 'https://radiorecord.hostingradio.ru/phonk96.aacp' ;;
        dorognoe)  echo 'https://dorognoe.hostingradio.ru:8000/dorognoe' ;;
        *)         die "Unknown radio channel '${channel}'. Available: lofi/fallout/wasteland/retrofm/rusradio/rock/phonk/dorognoe" ;;
    esac
}

send_cmd() {
    if [ ! -S "${SOCKET_PATH}" ]; then
        die "MPV socket not found at '${SOCKET_PATH}'. Is mpv running?"
    fi

    printf '{ "command": %s }\n' "${1}" | socat - "${SOCKET_PATH}" >/dev/null
}

launch_mpv() {
    rm -f "${SOCKET_PATH}"

    trap 'rm -f "${SOCKET_PATH}"' INT HUP EXIT TERM

    exec mpv --input-ipc-server="${SOCKET_PATH}" --no-video --ytdl-format=worstaudio "${@}"
}


play_playlist() {
    playlist="${1:-${HOME}/Music}"
    shift || true

    launch_mpv --shuffle "$@" -- "${playlist}"
}

play_radio() {
    channel="${1:-}"
    if [ -z "${channel}" ]; then
        die "Radio channel required. Usage: ${PROG} run radio <channel>"
    fi

    url="$(get_radio_url "${channel}")"
    launch_mpv "${url}"
}

tune_radio() {
    channel="${1:-}"
    if [ -z "${channel}" ]; then
        die "Radio channel required. Usage: ${PROG} radio <channel>"
    fi

    url="$(get_radio_url "${channel}")"
    send_cmd "[\"loadfile\", \"${url}\", \"replace\"]"
    echo "📻 Switched to: ${channel}"
}

handle_control() {
    action="${1}"
    case "${action}" in
        next|n)
            send_cmd '["playlist-next"]'
            echo "➡️ Next"
            ;;
        prev|p)
            send_cmd '["playlist-prev"]'
            echo "⬅️ Prev"
            ;;
        pause|space)
            send_cmd '["cycle", "pause"]'
            echo "⏯️ Pause toggled"
            ;;
        *)
            usage
            exit 1
            ;;
    esac
}

ACTION="${1:-}"
shift 2>/dev/null || true

case "${ACTION}" in
    run)
        subcmd="${1:-help}"
        shift || true
        case "${subcmd}" in
            music) play_playlist "$@" ;;
            radio) play_radio "$@" ;;
            *) usage; exit 1 ;;
        esac
        ;;
    radio)
        tune_radio "$@"
        ;;
    next|n|prev|p|pause|space)
        handle_control "${ACTION}"
        ;;
    help|"")
        usage
        ;;
    *)
        echo "Unknown command: ${ACTION}" >&2
        usage
        exit 1
        ;;
esac