import { useEffect, useState, useCallback } from "react";
import { apiGet } from "../../api";
import { PageHead, Empty, Loading, fmtDuration } from "../../components/ui";
import { IconDisc, IconMusic, IconSearch, IconPlay } from "../../components/icons";
import { useToast } from "../../lib/toast";

interface Album {
  id: string;
  name: string;
  artist: string;
  year?: number;
  song_count: number;
  duration: number;
  cover_url: string | null;
}
interface Song {
  id: string;
  title: string;
  track?: number;
  duration: number;
  artist: string;
}
interface AlbumDetail extends Album {
  songs: Song[];
}

const SORTS = [
  { key: "alphabeticalByName", label: "A–Z" },
  { key: "newest", label: "Newest" },
  { key: "recent", label: "Recently Played" },
  { key: "frequent", label: "Most Played" },
  { key: "random", label: "Random" },
];

export default function Library() {
  const toast = useToast();
  const [status, setStatus] = useState<{ connected: boolean; configured: boolean; error?: string } | null>(null);
  const [albums, setAlbums] = useState<Album[]>([]);
  const [loading, setLoading] = useState(true);
  const [sort, setSort] = useState("alphabeticalByName");
  const [query, setQuery] = useState("");
  const [selected, setSelected] = useState<AlbumDetail | null>(null);
  const [detailLoading, setDetailLoading] = useState(false);

  useEffect(() => {
    apiGet("/api/navidrome/status").then(setStatus).catch(() => setStatus({ connected: false, configured: false }));
  }, []);

  const load = useCallback(() => {
    setLoading(true);
    const q = query.trim();
    const path = q
      ? `/api/navidrome/albums?q=${encodeURIComponent(q)}&size=120`
      : `/api/navidrome/albums?type=${sort}&size=120`;
    apiGet<{ items: Album[] }>(path)
      .then((d) => setAlbums(d.items))
      .catch((e) => toast(e.message, "err"))
      .finally(() => setLoading(false));
  }, [sort, query, toast]);

  useEffect(() => {
    if (status?.connected) load();
  }, [status?.connected, sort]); // eslint-disable-line react-hooks/exhaustive-deps

  function openAlbum(id: string) {
    setDetailLoading(true);
    setSelected(null);
    apiGet<AlbumDetail>(`/api/navidrome/album/${id}`)
      .then(setSelected)
      .catch((e) => toast(e.message, "err"))
      .finally(() => setDetailLoading(false));
  }

  if (status && !status.configured) {
    return (
      <>
        <PageHead title="Music Library">Browse your Navidrome library.</PageHead>
        <div className="panel">
          <Empty icon={<IconMusic />}>
            Navidrome is not configured. Set <code>NAVIDROME_URL</code>, <code>NAVIDROME_USER</code> and{" "}
            <code>NAVIDROME_PASSWORD</code> and restart the app.
          </Empty>
        </div>
      </>
    );
  }
  if (status && status.configured && !status.connected) {
    return (
      <>
        <PageHead title="Music Library">Browse your Navidrome library.</PageHead>
        <div className="panel">
          <Empty icon={<IconMusic />}>Could not connect to Navidrome. {status.error}</Empty>
        </div>
      </>
    );
  }

  return (
    <>
      <PageHead title="Music Library">Browse artists and albums served by your Navidrome instance.</PageHead>

      <div className="row between wrap" style={{ marginBottom: 18, gap: 12 }}>
        <div className="seg">
          {SORTS.map((s) => (
            <button
              key={s.key}
              className={`seg-btn ${sort === s.key && !query ? "active" : ""}`}
              onClick={() => {
                setQuery("");
                setSort(s.key);
              }}
            >
              {s.label}
            </button>
          ))}
        </div>
        <form
          className="search-inner"
          style={{ width: 280 }}
          onSubmit={(e) => {
            e.preventDefault();
            load();
          }}
        >
          <IconSearch />
          <input
            className="input"
            placeholder="Search albums…"
            value={query}
            onChange={(e) => setQuery(e.target.value)}
          />
        </form>
      </div>

      {loading ? (
        <Loading label="Loading albums…" />
      ) : albums.length === 0 ? (
        <div className="panel">
          <Empty icon={<IconDisc />}>No albums found.</Empty>
        </div>
      ) : (
        <div className="card-grid">
          {albums.map((a) => (
            <div key={a.id} className="media-card" onClick={() => openAlbum(a.id)}>
              {a.cover_url ? (
                <img className="media-cover" src={`${a.cover_url}?size=300`} loading="lazy" alt={a.name} />
              ) : (
                <div className="media-cover" style={{ display: "grid", placeItems: "center" }}>
                  <IconDisc className="dim" />
                </div>
              )}
              <div className="media-body">
                <div className="media-title">{a.name}</div>
                <div className="media-sub">
                  {a.artist}
                  {a.year ? ` · ${a.year}` : ""}
                </div>
              </div>
            </div>
          ))}
        </div>
      )}

      {(selected || detailLoading) && (
        <div
          style={{
            position: "fixed",
            inset: 0,
            background: "rgba(4,7,11,0.7)",
            display: "grid",
            placeItems: "center",
            zIndex: 50,
            padding: 24,
          }}
          onClick={() => setSelected(null)}
        >
          <div className="panel" style={{ width: 640, maxWidth: "100%", maxHeight: "86vh", overflow: "auto" }} onClick={(e) => e.stopPropagation()}>
            {detailLoading || !selected ? (
              <Loading />
            ) : (
              <>
                <div className="panel-head">
                  {selected.cover_url && (
                    <img
                      src={`${selected.cover_url}?size=120`}
                      style={{ width: 64, height: 64, borderRadius: 10, objectFit: "cover" }}
                      alt=""
                    />
                  )}
                  <div className="grow">
                    <h3>{selected.name}</h3>
                    <div className="sub">
                      {selected.artist}
                      {selected.year ? ` · ${selected.year}` : ""} · {selected.song_count} tracks ·{" "}
                      {fmtDuration(selected.duration)}
                    </div>
                  </div>
                  <button className="btn btn-sm" onClick={() => setSelected(null)}>
                    Close
                  </button>
                </div>
                <table className="data-table">
                  <tbody>
                    {selected.songs.map((s) => (
                      <tr key={s.id}>
                        <td style={{ width: 36 }} className="cell-sub mono">
                          {s.track ?? <IconPlay />}
                        </td>
                        <td className="cell-strong">{s.title}</td>
                        <td style={{ textAlign: "right", width: 60 }} className="cell-sub mono">
                          {fmtDuration(s.duration)}
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </>
            )}
          </div>
        </div>
      )}
    </>
  );
}
