"use client";

import { useEffect, useRef, useState } from "react";
import { createPortal } from "react-dom";
import Link from "next/link";
import type { TMDBMovie } from "@/types/tmdb";
import { TMDB_GENRE_MAP, getTMDBImageUrl } from "@/types/tmdb";

interface MoreInfoModalProps {
  movie: TMDBMovie;
  onClose: () => void;
}

export function MoreInfoModal({ movie, onClose }: MoreInfoModalProps) {
  const [mounted, setMounted] = useState(false);
  const [trailerUrl, setTrailerUrl] = useState<string | null>(null);
  const [trailerStatus, setTrailerStatus] = useState<"loading" | "ready" | "none" | "error">(
    "loading",
  );
  const dialogRef = useRef<HTMLDivElement>(null);
  const closeBtnRef = useRef<HTMLButtonElement>(null);

  useEffect(() => {
    // Standard SSR-safe portal mount flag — intentional setState-in-effect.
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setMounted(true);
  }, []);

  const year = movie.release_date ? movie.release_date.slice(0, 4) : "";
  const genres = movie.genre_ids
    .map((id) => TMDB_GENRE_MAP[id])
    .filter(Boolean)
    .slice(0, 4);
  const posterUrl = getTMDBImageUrl(movie.poster_path, "panel");

  useEffect(() => {
    let cancelled = false;
    fetch(`/api/tmdb/movie/${movie.id}/videos`)
      .then((res) => res.json())
      .then((data: { trailerUrl: string | null }) => {
        if (cancelled) return;
        if (data.trailerUrl) {
          setTrailerUrl(data.trailerUrl);
          setTrailerStatus("ready");
        } else {
          setTrailerStatus("none");
        }
      })
      .catch(() => {
        if (!cancelled) setTrailerStatus("error");
      });
    return () => {
      cancelled = true;
    };
  }, [movie.id]);

  useEffect(() => {
    const previouslyFocused = document.activeElement as HTMLElement | null;
    closeBtnRef.current?.focus();

    function handleKey(e: KeyboardEvent) {
      if (e.key === "Escape") {
        e.stopPropagation();
        onClose();
      }
      if (e.key === "Tab" && dialogRef.current) {
        const focusables = Array.from(
          dialogRef.current.querySelectorAll<HTMLElement>(
            'button, a[href], [tabindex]:not([tabindex="-1"])',
          ),
        ).filter((el) => !el.hasAttribute("disabled"));
        if (focusables.length === 0) return;
        const first = focusables[0];
        const last = focusables[focusables.length - 1];
        if (e.shiftKey && document.activeElement === first) {
          e.preventDefault();
          last.focus();
        } else if (!e.shiftKey && document.activeElement === last) {
          e.preventDefault();
          first.focus();
        }
      }
    }

    document.addEventListener("keydown", handleKey);
    return () => {
      document.removeEventListener("keydown", handleKey);
      previouslyFocused?.focus?.();
    };
  }, [onClose]);

  if (!mounted) return null;

  return createPortal(
    <div
      className="fixed inset-0 z-50 flex items-center justify-center bg-black/70 p-4"
      onClick={onClose}
    >
      <div
        ref={dialogRef}
        role="dialog"
        aria-modal="true"
        aria-labelledby="more-info-title"
        className="relative flex max-h-[92vh] w-full max-w-5xl flex-col gap-6 overflow-y-auto rounded-2xl bg-background p-6 shadow-2xl sm:flex-row sm:gap-8 sm:p-8 lg:max-w-6xl"
        onClick={(e) => e.stopPropagation()}
      >
        <button
          ref={closeBtnRef}
          onClick={onClose}
          aria-label="Close"
          className="absolute right-3 top-3 flex h-9 w-9 items-center justify-center rounded-full bg-foreground/5 text-xl text-foreground/70 transition-colors hover:bg-foreground/15 hover:text-foreground"
        >
          ×
        </button>

        {posterUrl && (
          /* eslint-disable-next-line @next/next/no-img-element */
          <img
            src={posterUrl}
            alt={`Poster for ${movie.title}`}
            loading="lazy"
            className="mx-auto h-auto w-48 flex-shrink-0 rounded-xl shadow-lg sm:w-64"
          />
        )}

        <div className="flex min-w-0 flex-1 flex-col">
          <h2 id="more-info-title" className="pr-12 text-3xl font-semibold leading-tight">
            {movie.title}
            {year && <span className="ml-2 text-xl font-normal text-foreground/60">({year})</span>}
          </h2>

          {genres.length > 0 && (
            <div className="mt-3 flex flex-wrap gap-2">
              {genres.map((genre) => (
                <span
                  key={genre}
                  className="rounded-full bg-foreground/10 px-3 py-1 text-sm text-foreground/70"
                >
                  {genre}
                </span>
              ))}
            </div>
          )}

          {movie.overview && (
            <p className="mt-5 text-base leading-relaxed text-foreground/85">{movie.overview}</p>
          )}

          <div className="mt-auto flex flex-col gap-3 pt-6 sm:flex-row">
            <Link
              href="/login"
              className="flex-1 rounded-lg bg-foreground py-3 text-center text-base font-semibold text-background transition-opacity hover:opacity-90"
            >
              Add to list
            </Link>
            {trailerStatus === "ready" && trailerUrl ? (
              <a
                href={trailerUrl}
                target="_blank"
                rel="noopener noreferrer"
                className="flex-1 rounded-lg border border-foreground/30 py-3 text-center text-base font-semibold transition-colors hover:bg-foreground/5"
              >
                Watch Trailer
              </a>
            ) : (
              <button
                disabled
                className="flex-1 rounded-lg border border-foreground/20 py-3 text-base font-semibold text-foreground/40"
              >
                {trailerStatus === "loading" ? "Loading…" : "No trailer"}
              </button>
            )}
          </div>
        </div>
      </div>
    </div>,
    document.body,
  );
}