"use client";

import { useEffect, useState, type ReactNode } from "react";
import { Modal } from "./modal";
import { CoverArt } from "./cover-art";

type Track = { position: number; title: string; lengthMs: number | null };

function fmt(ms: number | null): string {
  if (ms == null) return "";
  const s = Math.round(ms / 1000);
  return `${Math.floor(s / 60)}:${String(s % 60).padStart(2, "0")}`;
}

export type AlbumInfo = {
  rgMbid: string | null;
  album: string;
  artist: string;
  year?: string | null;
  type?: string | null;
};

/** Reusable album modal: cover art + tracklist (fetched from MB by release-group MBID) with
 *  slots for a status chip and context-specific action buttons. */
export function AlbumModal({
  open,
  onClose,
  album,
  status,
  actions,
}: {
  open: boolean;
  onClose: () => void;
  album: AlbumInfo;
  status?: ReactNode;
  actions?: ReactNode;
}) {
  const [tracks, setTracks] = useState<Track[] | "loading" | "error">("loading");

  useEffect(() => {
    if (!open) return;
    if (!album.rgMbid) {
      setTracks("error");
      return;
    }
    setTracks("loading");
    let cancelled = false;
    fetch(`/api/mb/release-groups/${album.rgMbid}/tracks`)
      .then((r) => (r.ok ? r.json() : Promise.reject()))
      .then((d) => !cancelled && setTracks(d.tracks))
      .catch(() => !cancelled && setTracks("error"));
    return () => {
      cancelled = true;
    };
  }, [open, album.rgMbid]);

  return (
    <Modal open={open} onClose={onClose} title={album.artist} wide>
      <div className="album-modal-head">
        <CoverArt rgMbid={album.rgMbid} alt={album.album} size={250} className="album-modal-cover" />
        <div>
          <h2 className="album-modal-title">{album.album}</h2>
          <div className="album-modal-meta">
            {album.type ? <span>{album.type}</span> : null}
            {album.year ? (
              <>
                <span className="dot">·</span>
                <span>{album.year}</span>
              </>
            ) : null}
          </div>
          {status ? <div className="album-modal-status">{status}</div> : null}
          {actions ? <div className="actions album-modal-actions">{actions}</div> : null}
        </div>
      </div>
      <div className="album-modal-tracks">
        {tracks === "loading" ? <p className="muted-note">Loading tracks…</p> : null}
        {tracks === "error" ? <p className="muted-note">No tracklist available.</p> : null}
        {Array.isArray(tracks) ? (
          <ol className="tracks">
            {tracks.map((t) => (
              <li key={t.position}>
                <span className="tnum">{t.position}</span>
                <span className="tname">{t.title}</span>
                {t.lengthMs != null ? <span>{fmt(t.lengthMs)}</span> : null}
              </li>
            ))}
          </ol>
        ) : null}
      </div>
    </Modal>
  );
}
