import { useState, useEffect, useRef } from "react";
import { Howl, Howler } from "howler";
import Play from "@mui/icons-material/PlayArrow";
import Pause from "@mui/icons-material/Pause";
import "@styles/player.css";

const API_URL = "https://api.codey.lol";
Howler.html5PoolSize = 32;

const STATIONS = {
  main: { label: "Main", streamPath: "/sfm.ogg" },
  rock: { label: "Rock", streamPath: "/rock.ogg" },
  rap: { label: "Rap", streamPath: "/rap.ogg" },
  electronic: { label: "Electronic", streamPath: "/electronic.ogg" },
  classical: { label: "Classical", streamPath: "/classical.ogg" },
  pop: { label: "Pop", streamPath: "/pop.ogg" },
};

// Global interval tracking (required for Astro + client:only)
let activeInterval = null;
let currentStationForInterval = null;

function clearGlobalMetadataInterval() {
  if (activeInterval) {
    clearInterval(activeInterval);
    activeInterval = null;
    currentStationForInterval = null;
  }
}

export function Player() {
  const [activeStation, setActiveStation] = useState("main");
  const [isPlaying, setIsPlaying] = useState(false);
  const [trackTitle, setTrackTitle] = useState("");
  const [trackArtist, setTrackArtist] = useState("");
  const [trackGenre, setTrackGenre] = useState("");
  const [coverArt, setCoverArt] = useState("/images/radio_art_default.jpg");
  const [elapsed, setElapsed] = useState(0);
  const [duration, setDuration] = useState(0);

  const soundRef = useRef(null);
  const uuidRef = useRef(null);
  const lastStationData = useRef(null);

  const formatTime = (seconds) => {
    const m = String(Math.floor(seconds / 60)).padStart(2, "0");
    const s = String(Math.floor(seconds % 60)).padStart(2, "0");
    return `${m}:${s}`;
  };

  const progress = duration > 0 ? (elapsed / duration) * 100 : 0;

  // Create Howl instance on activeStation change
  useEffect(() => {
    if (soundRef.current) {
      soundRef.current.unload();
      soundRef.current = null;
    }

    const streamUrl = "https://stream.codey.lol" + STATIONS[activeStation].streamPath;

    const howl = new Howl({
      src: [streamUrl],
      html5: true,
      onend: () => howl.play(),
      onplay: () => setIsPlaying(true),
      onpause: () => setIsPlaying(false),
      onstop: () => setIsPlaying(false),
      onloaderror: (id, err) => console.error("Load error", err),
      onplayerror: (id, err) => {
        console.error("Play error", err);
        setTimeout(() => howl.play(), 1000);
      },
    });

    soundRef.current = howl;
    uuidRef.current = null;
    lastStationData.current = null;

    // Autoplay if previously playing
    if (isPlaying) {
      setTimeout(() => {
        if (soundRef.current) {
          soundRef.current.play();
        }
      }, 100);
    }

    return () => {
      howl.stop();
      howl.unload();
    };
  }, [activeStation]);

const togglePlayback = () => {
  if (isPlaying) {
    if (soundRef.current) {
      soundRef.current.pause();
    }
    setIsPlaying(false);
  } else {
    // If a previous Howl exists, unload it
    if (soundRef.current) {
      soundRef.current.stop();
      soundRef.current.unload();
    }

    const streamUrl =
      "https://stream.codey.lol" +
      STATIONS[activeStation].streamPath +
      `?t=${Date.now()}`; // Cache-busting param

    const newHowl = new Howl({
      src: [streamUrl],
      html5: true,
      onend: () => newHowl.play(),
      onplay: () => {
        setIsPlaying(true);
      },
      onpause: () => setIsPlaying(false),
      onstop: () => setIsPlaying(false),
      onloaderror: (_, err) => console.error("Load error", err),
      onplayerror: (_, err) => {
        console.error("Play error", err);
        setTimeout(() => newHowl.play(), 1000);
      },
    });

    soundRef.current = newHowl;
    newHowl.play();
  }
};


  // Metadata fetcher: global-safe
  useEffect(() => {
    clearGlobalMetadataInterval();

    currentStationForInterval = activeStation;

    const fetchTrackData = async () => {
      try {
        const response = await fetch(`${API_URL}/radio/np?station=${activeStation}`, {
          method: "POST",
        });
        const data = await response.json();

        // Ignore stale interval calls
        if (currentStationForInterval !== activeStation) return;

        if (data.artist === "N/A" && data.song === "N/A") {
          if (lastStationData.current !== "offline") {
            setTrackTitle("Offline");
            setTrackArtist("");
            setTrackGenre("");
            setCoverArt("/images/radio_art_default.jpg");
            setElapsed(0);
            setDuration(0);
            lastStationData.current = "offline";
          }
          return;
        }

        if (data.uuid === uuidRef.current) {
          if (lastStationData.current === data.uuid) {
            setElapsed(data.elapsed);
            setDuration(data.duration);
          }
          return;
        }

        uuidRef.current = data.uuid;
        lastStationData.current = data.uuid;
        setTrackTitle(data.song);
        setTrackArtist(data.artist);
        setTrackGenre(data.genre !== "N/A" ? data.genre : "");
        setCoverArt(`${API_URL}/radio/album_art?station=${activeStation}&_=${Date.now()}`);
        setElapsed(data.elapsed);
        setDuration(data.duration);
      } catch (error) {
        console.error("Failed to fetch track data:", error);
      }
    };

    fetchTrackData();
    activeInterval = setInterval(fetchTrackData, 1000);

    return () => {
      clearGlobalMetadataInterval();
    };
  }, [activeStation]);

  return (
    <>
      <div className="station-tabs flex gap-2 justify-center mb-4 flex-wrap z-10 relative">
        {Object.entries(STATIONS).map(([key, { label }]) => (
          <button
            key={key}
            className={`px-3 py-1 rounded-full text-sm font-semibold transition-colors ${
              activeStation === key
                ? "bg-neutral-800 text-white dark:bg-white dark:text-black"
                : "bg-neutral-200 text-black dark:bg-neutral-700 dark:text-white"
            }`}
            onClick={() => setActiveStation(key)}
            aria-pressed={activeStation === key}
          >
            {label}
          </button>
        ))}
      </div>

      <div className="c-containter">
        <div className="music-container mt-8">
          <section className="album-cover">
            <img src={coverArt} className="cover" alt="Cover Art" />
          </section>
          <section className="music-player">
            <h1 className="music-player__header">serious.FM</h1>
            <h1 className="music-player__title">{trackTitle}</h1>
            <h2 className="music-player__author">{trackArtist}</h2>
            {trackGenre && <h2 className="music-player__genre">{trackGenre}</h2>}
            <div className="music-time">
              <p className="music-time__current">{formatTime(elapsed)}</p>
              <p className="music-time__last">{formatTime(duration - elapsed)}</p>
            </div>
            <div className="music-bar" id="progress">
              <div id="length" style={{ width: `${progress}%` }}></div>
            </div>
            <div className="music-control">
              <div className="music-control__play" id="play">
                {!isPlaying ? (
                  <Play onClick={togglePlayback} />
                ) : (
                  <Pause onClick={togglePlayback} />
                )}
              </div>
            </div>
          </section>
        </div>
      </div>
    </>
  );
}