import { useEffect, useRef, useState } from "react";
import { useNavigate, useParams } from "react-router-dom";
import api, { getStreamUrl } from "../lib/api";
import { ArrowLeft } from "lucide-react";

export default function Player() {
  const { id } = useParams();
  const nav = useNavigate();
  const [movie, setMovie] = useState(null);
  const videoRef = useRef(null);
  const lastSent = useRef(0);

  useEffect(() => {
    let cancelled = false;
    (async () => {
      const { data } = await api.get(`/movies/${id}`);
      if (cancelled) return;
      setMovie(data);
      // Restore progress
      try {
        const { data: p } = await api.get(`/progress/${id}`);
        if (videoRef.current && p?.position_seconds) {
          videoRef.current.currentTime = p.position_seconds;
        }
      } catch {}
    })();
    return () => { cancelled = true; };
  }, [id]);

  const onTimeUpdate = () => {
    const v = videoRef.current;
    if (!v || !v.duration) return;
    const now = Date.now();
    if (now - lastSent.current < 5000) return;
    lastSent.current = now;
    api.post("/progress", {
      movie_id: id,
      position_seconds: v.currentTime,
      duration_seconds: v.duration,
    }).catch(() => {});
  };

  if (!movie) {
    return (
      <div className="min-h-screen bg-black flex items-center justify-center text-[#8A8A8A]" data-testid="player-loading">
        Loading…
      </div>
    );
  }

  return (
    <div className="fixed inset-0 bg-black z-50 flex flex-col" data-testid="player-page">
      <button
        onClick={() => nav(-1)}
        className="absolute top-6 left-6 z-10 flex items-center gap-2 text-white/80 hover:text-white bg-black/60 hover:bg-black px-4 py-2 transition-colors duration-300"
        data-testid="player-back-button"
      >
        <ArrowLeft size={16} strokeWidth={1.5} />
        <span className="text-xs uppercase tracking-[0.2em]">Back</span>
      </button>

      <div className="absolute top-6 right-6 z-10 text-right">
        <h2 className="font-display text-xl text-white tracking-tight" data-testid="player-title">
          {movie.title}
        </h2>
        <p className="text-[10px] uppercase tracking-[0.3em] text-[#8A8A8A]">{movie.year} · {movie.rating}</p>
      </div>

      <video
        ref={videoRef}
        src={getStreamUrl(movie)}
        controls
        autoPlay
        className="w-full h-full object-contain bg-black"
        onTimeUpdate={onTimeUpdate}
        data-testid="player-video"
      />
    </div>
  );
}