"use client";

import * as React from "react";
import { AnimatePresence, motion } from "framer-motion";
import { Square } from "lucide-react";
import { mmss, type Track } from "@/lib/api";

/**
 * 30-second Deezer preview.
 *
 * Deliberately NOT a library player. Playing your own music belongs in
 * Navidrome, which already does offline, CarPlay, gapless and scrobbling, and
 * has a dozen native clients. This exists for one job: confirm you picked the
 * right recording before a Soulseek search is committed to it — which is the
 * cheapest possible guard against importing the wrong take.
 */

type Ctx = {
  playing: number | null;
  toggle: (t: Track) => void;
  stop: () => void;
};

const PlayerCtx = React.createContext<Ctx>({
  playing: null,
  toggle: () => {},
  stop: () => {},
});

export const usePlayer = () => React.useContext(PlayerCtx);

export function PlayerProvider({ children }: { children: React.ReactNode }) {
  const audioRef = React.useRef<HTMLAudioElement | null>(null);
  const [track, setTrack] = React.useState<Track | null>(null);
  const [pct, setPct] = React.useState(0);
  const [left, setLeft] = React.useState(30_000);

  if (typeof window !== "undefined" && !audioRef.current) {
    audioRef.current = new Audio();
    audioRef.current.preload = "none";
  }

  const stop = React.useCallback(() => {
    const a = audioRef.current;
    if (a) {
      a.pause();
      a.removeAttribute("src");
      a.load();
    }
    setTrack(null);
    setPct(0);
  }, []);

  const toggle = React.useCallback(
    (t: Track) => {
      const a = audioRef.current;
      if (!a || !t.preview) return;
      if (track?.deezer_id === t.deezer_id) {
        stop();
        return;
      }
      a.pause();
      a.src = t.preview;
      void a.play().catch(() => undefined);
      setTrack(t);
      setPct(0);
    },
    [track, stop],
  );

  React.useEffect(() => {
    const a = audioRef.current;
    if (!a) return;
    const onTime = () => {
      const d = a.duration || 30;
      setPct((a.currentTime / d) * 100);
      setLeft((d - a.currentTime) * 1000);
    };
    a.addEventListener("timeupdate", onTime);
    a.addEventListener("ended", stop);
    return () => {
      a.removeEventListener("timeupdate", onTime);
      a.removeEventListener("ended", stop);
    };
  }, [stop]);

  // Stop playback when the tab is hidden — nobody wants a phantom 30s clip.
  React.useEffect(() => {
    const onHide = () => document.hidden && stop();
    document.addEventListener("visibilitychange", onHide);
    return () => document.removeEventListener("visibilitychange", onHide);
  }, [stop]);

  const value = React.useMemo(
    () => ({ playing: track?.deezer_id ?? null, toggle, stop }),
    [track, toggle, stop],
  );

  return (
    <PlayerCtx.Provider value={value}>
      {children}
      <AnimatePresence>
        {track && (
          <motion.div
            initial={{ opacity: 0, y: 22, x: "-50%" }}
            animate={{ opacity: 1, y: 0, x: "-50%" }}
            exit={{ opacity: 0, y: 22, x: "-50%" }}
            transition={{ type: "spring", stiffness: 380, damping: 32 }}
            className="sheet fixed bottom-4 left-1/2 z-70 flex items-center gap-3
                       rounded-[20px] py-2 pl-2 pr-4 w-[min(560px,calc(100vw-28px))]"
          >
            {track.cover && (
              /* eslint-disable-next-line @next/next/no-img-element */
              <img
                src={track.cover}
                alt=""
                className="w-[42px] h-[42px] rounded-[9px] object-cover bg-faint shrink-0"
              />
            )}
            <div className="flex-1 min-w-0">
              <div className="text-callout font-semibold clamp1">{track.title}</div>
              <div className="text-xs text-dim clamp1">{track.artist}</div>
            </div>
            <div className="hidden sm:block w-24 h-[3px] rounded-full bg-faint overflow-hidden shrink-0">
              <motion.i
                className="block h-full rounded-full bg-accent"
                animate={{ width: `${pct}%` }}
                transition={{ ease: "linear", duration: 0.25 }}
              />
            </div>
            <span className="hidden sm:block text-caption text-dim tabular-nums shrink-0">
              {mmss(left)}
            </span>
            <button
              onClick={stop}
              aria-label="Stop preview"
              className="w-8 h-8 shrink-0 grid place-items-center rounded-full glass-hi
                         text-ink cursor-pointer transition hover:border-accent-line
                         hover:text-accent"
            >
              <Square className="w-3 h-3 fill-current" />
            </button>
          </motion.div>
        )}
      </AnimatePresence>
    </PlayerCtx.Provider>
  );
}