#!/usr/bin/env bash

get_time_ms() {
  date -u +%s%3N
}

URL_BASE="https://www.radiorecord.ru/api"

MPV_PID_FILE="/tmp/mpv_radio_pid"
RADIO_ID_FILE="/tmp/radio_id"

STATIONS="[]"

PID=$( [ -e "$MPV_PID_FILE" ] && cat "$MPV_PID_FILE" || echo 0 )
RADIO_ID=$( [ -e "$RADIO_ID_FILE" ] && cat "$RADIO_ID_FILE" || echo 0 )
RADIO_URL=""
INFO='{"id":null,"artist":null,"song":null,"image600":null}'
PAUSED=$(( $PID == 0 || $RADIO_ID == 0 ? 1 : 0 ))
STATUS="{}"

get_radio() {
  echo "$STATIONS" | jq -r --argjson sel_id "$RADIO_ID" 'map(select(.id == $sel_id)).[0]'
}

get_song() {
  echo $(curl -s "$URL_BASE/station/history/?id=$RADIO_ID" | jq '.result.history[0] | ({id, artist, song, image600})')
}


update() {
  PID=$( [ -e "$MPV_PID_FILE" ] && cat "$MPV_PID_FILE" || echo 0 )
  RADIO_ID=$( [ -e "$RADIO_ID_FILE" ] && cat "$RADIO_ID_FILE" || echo 0 )
  PAUSED=$(( $PID == 0 && $RADIO_ID > 0 ? 1 : 0 ))
}

start() {
  STATIONS=$(curl -s "$URL_BASE/stations/" | jq --argjson ids '[507,522,523,536,537,42532,42602]' '.result.stations | map(select(.id | IN($ids[]))) | map({id, title, stream_hls, icon_fill_white})')
  RADIO_URL=$(get_radio | jq -r '.stream_hls')
  if [ "$PAUSED" = 0 ]; then
    kill -9 $PID
  fi
  mpv "$RADIO_URL" & echo $! > "$MPV_PID_FILE"
  echo $RADIO_ID > "$RADIO_ID_FILE"
}


toggle() {
  if [ "$PAUSED" = 1 ]; then
    echo $RADIO_ID $PID
    start
  else
    kill -9 "$PID"
    rm -f $MPV_PID_FILE
  fi
}

status() {
  echo $(jq -cnr --argjson pid "$PID" --argjson stations "$STATIONS" --argjson radio_id "$RADIO_ID" --argjson is_paused "$PAUSED" --argjson info "$INFO" '{"is_paused": $is_paused, "song": $info, "radio": $radio_id, "stations": $stations}')
}


status_loop() {
  STATUS=$(status)
  echo $STATUS
  STATIONS=$(curl -s "$URL_BASE/stations/" | jq --argjson ids '[507,522,523,536,537,42532,42602]' '.result.stations | map(select(.id | IN($ids[]))) | map({id, title, stream_hls, icon_fill_white})')
  last_time_info=0
  last_time=0
  while true; do
    current_time=$(get_time_ms)
    delta=$((current_time - last_time))
    delta_i=$((current_time - last_time_info))
    if [[ $delta -gt 1000 ]]; then
      PID=$( [ -e "$MPV_PID_FILE" ] && cat "$MPV_PID_FILE" || echo 0 )
      RADIO_ID=$( [ -e "$RADIO_ID_FILE" ] && cat "$RADIO_ID_FILE" || echo 0 )
      PAUSED=$(( $PID == 0 && $RADIO_ID > 0 ? 1 : 0 ))
      NEW_STATUS=$(status)
      if [[ "$NEW_STATUS" != "$STATUS" ]]; then
        STATUS=$NEW_STATUS
        echo $STATUS
      fi
      last_time=$current_time
    fi
    if [[ $delta_i -gt 15000 ]]; then
      if [ "$PAUSED" = 1 ]; then
        INFO="{\"id\":null,\"artist\":null,\"song\":null,\"image600\": \"$(get_radio | jq -r '.icon_fill_white')\"}"
      else
        INFO=$(echo "$INFO" "$(get_song)" | jq -s ' reduce .[] as $item ( {}; . + (
            reduce ($item | to_entries[]) as $entry ( {}; if $entry.value != null then .[$entry.key] = $entry.value else . end
          )) )')
      fi
      last_time_info=$current_time
    fi
  done
}

# Main script
case "$1" in
  "start")
    RADIO_ID=$2
    start
    ;;
  "toggle")
    toggle
    ;;
  *)
    status_loop
    ;;
esac